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  • 1.
    Abdeljaber, Osama
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Dorn, Michael
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Brandt, Anders
    University of Southern Denmark, Denmark.
    Scaling an OMA Modal Model of a Wood Building Using OMAH and a Small Shaker2020In: Topics in Modal Analysis & Testing: Volyme 8 / [ed] Dilworth B., Mains M., Springer, 2020, p. 151-157Conference paper (Refereed)
    Abstract [en]

    Operational modal analysis, OMA, results in unscaled mode shapes, since no forces are measured. Yet, obtaining a scaled modal model, i.e. knowing the modal mass of each mode (assuming proportional damping), is essential in many cases for structural health monitoring and load estimation. Several methods have therefore recently been developed for this purpose. The so-called OMAH method is a recently developed method for scaling OMA models, based on harmonic excitation of the structure. A number of frequencies are excited, one by one, and for each frequency, one or more frequency response values are calculated, that are then used for estimation of the modal masses of each mode, and residual effects of modes outside the frequency of interest. In the present paper, measurements were made on a four-story office building which was excited with a small, 200 N sine peak electrodynamic shaker. It is demonstrated that this small shaker was sufficient to excite the building with a force level of approx.. 1.8 N RMS close to the first eigenfrequency of the building, which was sufficient to produce harmonic response across the building. Reliable modal masses were possible to obtain within an accuracy of 6%. This demonstrates the feasibility of the OMAH method.

  • 2.
    Abdula, Sham
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Oksman, Dan
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Attefallshus som komplementbostadshus: Drömhus eller mardröm?2015Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Den 2 juli 2014 blev det enligt lag tillåtet för en- och tvåbostadshusägare att uppföra en bygglovsbefriad komplementbyggnad på max 25 kvadratmeter på den egna fastigheten. Rapporten undersöker vilket genomslag lagändringen har haft i Stor-Stockholm, Stor-Göteborg och Stor-Malmö. Undersökningen visar att lagändringen ännu inte har haft något stort genomslag. I rapporten undersöks även en utvald del av marknadsaktörers utbud av attefallshus avsett som komplementbostadshus. 

    Ett attefallshus utformas med miljövänligt hållbara material och inspireras av Vitruvius tre principer för god arkitektur. Huset konstrueras med avsikt att uppfylla kraven som ställs i PBL, PBF, BBR och EKS. Målet med de framtagna bygghandlingarna är att få startbesked från byggnadsnämnden i Växjö. 

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  • 3.
    Addassi, Mouadh
    et al.
    Technical University of Denmark, Denmark.
    Johannesson, Björn
    Linnaeus University, Faculty of Technology, Department of Building Technology. Linnaeus University, Linnaeus Knowledge Environments, Advanced Materials.
    Reactive mass transport in concrete including for gaseous constituents using a two-phase moisture transport approach2020In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 232, p. 1-14, article id 117148Article in journal (Refereed)
    Abstract [en]

    This article presents the further development of a tool for multi-phase reactive mass transport modelingfor durability estimation of cement-based materials, by the addition of the gas phase, adopting a trulyseparate two-phase moisture transport approach. The governing system of equations are based on phys-ically sound hybrid mixture based version of the Poisson-Nernst-Planck system of equations includinggaseous transport in the air-filled space, ionic transport in the liquid phase, electro-migration of ionicspecies, a two-phase moisture transport model, and sorption. The addition of the gas phase and thetwo-phase moisture description enables the user of the model to investigate individual and combinedeffects of different degradation processes in unsaturated systems. The altering of hydrated cement underthree different environments were studied representing an accelerated carbonation environment, a sub-merged marine environment and a cyclic drying-wetting zone in a marine environment, to illustratesome of the model’s capabilities.

  • 4.
    Addassi, Mouadh
    et al.
    Technical University of Denmark, Denmark.
    Johannesson, Björn
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Wadsö, Lars
    Lund University, Sweden.
    Inverse analyses of effective diffusion parameters relevant for a two-phase moisture model of cementitious materials2018In: Cement and Concrete Research, ISSN 0008-8846, E-ISSN 1873-3948, Vol. 106, p. 117-129Article in journal (Refereed)
    Abstract [en]

    Here we present an inverse analyses approach to determining the two-phase moisture transport properties re-levant to concrete durability modeling. The purposed moisture transport model was based on a continuumapproach with two truly separate equations for the liquid and gas phase being connected by the sorption ki-netics. The moisture properties of ten binder-systems containingfly ash, calcined clay, burnt shale and graymicro-filler, were investigated experimentally. The experiments used were, (i) sorption test (moisturefixation),(ii) cup test in two different relative humidity intervals, (iii) drying test, and, (iv) capillary suction test. Masschange over time, as obtained from the drying test, the two different cup test intervals and the capillary suctiontest, was used to obtain the effective diffusion parameters using the proposed inverse analyses approach. Themoisture properties obtained with the proposed inverse analyses method provide a good description of the testperiod for the ten different binder-systems.

  • 5.
    Ahn, Namhyuck
    et al.
    Oregon State University, USA.
    Bjarvin, Christina
    University of Washington, USA.
    Riggio, Mariapaola
    Oregon State University, USA.
    Muszynski, Lech
    Oregon State University, USA.
    Schimleck, Laurence
    Oregon State University, USA.
    Pestana, Catarina
    Oregon State University, USA.
    Dodoo, Ambrose
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Puettmann, Maureen
    WoodLife Environmental Consultants, USA.
    Envisioning mass timber buildings for circularity: life cycle assessment of a mass timber building with different end-of-life (EoL) and post-EoL options2023In: WCTE 2023-World Conference on Timber Engineering: Timber for a Livable Future, 19-22 June, Oslo. 2898-2906 / [ed] Nyrud, A. Q. and Malo, K. A. et al., Curran Associates, Inc., 2023, p. 3581-3587Conference paper (Refereed)
    Abstract [en]

    The foundation of the circular economy in the construction sector is based on implementing the deconstruction and reuse of buildings, providing the potential for a closed loop of building materials within the supply chain. Mass timber buildings using large, prefabricated elements and certain types of reversible mechanical connections are deemed to have great potential for post end-of-life (EoL) options, including recycling and reuse. To fully characterize the benefits of reusing post-use mass timber in new construction projects, it is crucial to conceptualize a ‘grave-to-gate’ approach, including the complete analysis of post-EoL activities and impacts on the material’s second life. In this study, a comparative life cycle assessment (LCA) including different EoL and post-EoL options for a virtual reference mid-rise mass timber building in the Pacific Northwest (PNW) of the United States was conducted. Among four different deconstruction and reuse scenarios examined in this study, a case of nearly complete reconstruction of a mass timber building for the second service life used as an idealized reference established an optimistic limit for reduction of global warming potential (GWP) by 13-41% compared to the ‘demolish and landfill’ decision, depending on the scenario. The demolition and landfill scenario had the lowest net impact since the GWMP calculations accounted for the carbon storage benefits in the landfill in addition to the carbon stored in the building.

  • 6.
    Akter, Shaheda T.
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Serrano, Erik
    Lund University, Sweden.
    Bader, Thomas K.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Numerical modelling of wood under combined loading of compressionperpendicular to the grain and rolling shear2021In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 244, article id 112800Article in journal (Refereed)
    Abstract [en]

    Numerical modeling is an efficient tool for experimental validation and for gaining a deeper understanding of complex material phenomena, especially when causal relationships are overlaid by material variability. Wood is such a highly orthotropic and complex material, which in engineering problems however is considered as macro- homogeneous. The aim of this study is to numerically investigate stress and strain states of wood in the radial- tangential plane and the influence of the orthotropic material behavior on the structural response. Model vali-dation is based on experiments performed on clear wood of Norway spruce (Picea abies) by using a biaxial test setup. Three material models were used, namely Hill’s plasticity model, the Hoffman criterion and a novel quadratic multi-surface (QMS) criterion. After validation on the local material scale, the models were applied to the engineering problem of compression perpendicular to the grain for studying the effect of the unloaded length. As a novel part, the influence of the annual ring structure on the local material behavior and the global elasto- plastic force–displacement behavior of wood under compression perpendicular to the grain were numerically investigated. Hill’s failure criterion was found to be the least suitable at both length scales, local material behavior and global structural response. The Hoffman and the QMS criteria showed quite good agreement with the biaxial experiments in terms of force–displacement relations and strain distributions for different loading situations, especially for combinations with radial compression, while there was less agreement with experiments for  the  behavior of  combinations with tangential compression. Application of  these material models to compression perpendicular to the grain for studying the unloaded length effect yielded similar trends as observed in structural tests. A reasonable and similar force–displacement response by Hoffman and QMS criteria was observed, while Hill’s model yielded significantly overestimated force carrying capacity. Differences in force-–displacement response for different loading situations were well in line with literature findings and the infl-ence of the annual ring curvature on the overall force–displacement behavior could be quantified.

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  • 7.
    Al-anbagi, Ali
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Khalil, Dani
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Utformning avlandningsbanors överbyggnad med hänsyn till slitlagrets bärförmåga2020Independent thesis Basic level (professional degree), 180 HE creditsStudent thesis
    Abstract [en]

    n this study, the design of the runway structure of the runways is studied in order tocompare different material compositions in the pavement. This is done with the helpof a survey, the program FAARFIELD and peer reviewed studies. Generally, thereare two different types of road structures in an airfield, rigid and flexible (concreteand asphalt). The result obtained shows the difference between the differentdimensions and the material content of the different types of road structures, whenthey are loaded with either heavy or light aircraft models. These results are based ona design period that has been selected for 20 years. In contrast, the stiffness of theconcrete was much higher than the asphalt stiffness, which means that it is better touse concrete in large commercial airports. According to the CDF diagram (thediagram showing whether the structural design conditions are met), the damagecaused by the aircraft is approximately at the same location on the runway for bothsuperstructures, it also means that flexible superstructure maintenance needs to bedone more often, compared to rigid superstructures. The fact that the asphalt has alower modulus of elasticity than the concrete is also a reason why maintenance forflexible superstructures needs to be done more often. However, when the roadstructures became heavily loaded, the total demanding thickness for the rigid roadstructure is calculated to be 760 mm and for the flexible road structure 710 mm.

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  • 8.
    Aldarwash, Mustafa
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bajqinca, Alban
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Nybyggnation av badrum : Jämförelse mellan prefabricerat och platsbyggt ur ett ekonomiskt perspektiv2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med arbetet är att, genom en ekonomisk undersökning skapa underlag som visar vilket alternativ av produktionsmetoderna prefabricerat eller platsbyggt badrum som är att föredra vid en nybyggnation av vårdhem. 

    Resultatet visar att det platsbyggda badrummet ger en ökad totalt kostnad på 627457 kr vilket motsvarar 11,1 procent dyrare än det prefabricerade badrummet. 

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  • 9.
    Alhadi, Mustafa
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Shehadeh, Zijad
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Guide för beräkning av förband i korslimmade träkonstruktioner: inkl. några dimensioneringsexempel2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Cross-laminated timber (CLT) is a rather new construction material that has increased its popularity and usage significantly within the building industry in the past years. In timber buildings, the connections are one of the most challenging parts to design. Thus, there are high demands put on structural engineers to make a safe and economic design. Today structural engineers have no specific and clear guideline that they can use as help for design of connections in CLT-buildings. By reviewing the most common CLT-handbooks, comparing them with each other, and picking out the best parts from each of the handbooks, a new guideline for design of connections in CLT-structures was developed in this thesis with complementary design examples. The guidelines main purpose is to act as help for the structural engineer when designing connections in CLT-structures. It is indented that the guideline acts as basis for the development of a future CLT-handbook with a collection of supporting calculation examples.

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  • 10.
    Andersson, Christoffer
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Nilsson, Tilda
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Livscykelanalys av volymelement i produktskedet2020Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Global warming has led to the Swedish government, as part of the global climate goals, to propose a legislative requirement that is supposed to come into force from January 1, 2022. The forthcoming legislative requirement will stipulate that greenhouse gas emission from buildings' life cycle are documented and presented.

    The purpose and goal of this thesis is to investigate and analyze the climate impact of a prefabricated building module during the product stage. The object investigated is a building module with a living area of 40.6 m2, which is part of a larger apartment building. The climate impact has been calculated and analyzed with life cycle analysis approach using the Construction Sector's Environmental Calculation Tool (Byggsektorns miljöberäkningsverktyg). The analysis is limited to the product stage of the module including extraction and processing of raw materials, transportation and manufacturing of the module.

    The result of the study is that the modules climate impact is 124.8 kilograms carbon dioxide equivalents per square meter according to specific data. The major part of greenhouse gas emissions comes from the material cross laminated wood and from energy sources being used in the manufacturing of building products and the module.

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  • 11.
    Andersson, Jenny
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Malin, Enbom
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Hur ökas implementering av visuella arbetssätt inom Skanska?2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Visuella arbetssätt har visat sig vara effektivt inom byggbranschen. Studien omfattar de visuella arbetssätt som Skanska använder sig av; visuell styrning och visuell projektering. Syftet med studien är att öka antalet projekt som väljer att implementera arbetssätten. Därav har underliggande problem identifierats varför inte projekt väljer att implementera arbetssätten i den utsträckning som Skanska önskar.

    Det har visat sig under studiens gång att visuell projektering har implementerats i större utsträckning än visuell styrning, detta för att visuell projektering har ett mer utvecklat underlag. En jämförelse av verktygens implementering har gjorts.

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  • 12.
    Andersson, Josefine
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Svensson, Simon
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Mätning av fuktkvot i sammansatta KL-träelement2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Moisture related damage is an occurring problem in wood-based buildings if the material is exposed to rainfall during construction. Measurement of moisture content can be done with various instruments and methods. The purpose of the thesis is to study change in moisture content in cross-laminated-timber, with prolonged exposure to water in laboratory environment. To advance the field, the Linnaeus University has been developing a measurement instrument of their own in collaboration with the company Saab. The instrument measures electrical resistance in wood where the obtained values will be compared to similar measurements from a product named Gigamodule. The self-developed sensor card is still a product under development. In addition to the lab setting measurements the instrument was also installed in a local building in Växjö.

    To verify the result from the previously mentioned resistance measurers additional instruments and methods have been utilized. Two separate models have been used to represent the detail of the connection between the wall element and the joist. Both models have been submerged under water for an equal amount of time. The experimental setting took place between the 19th of April to the 18th of May 2018. The measurements and calculations have been resulting in values that can be the subject of internal evaluation. Difference in result based on the direction of the grain have been observed in several measurement methods. The CLT-elements demonstrated good drying properties despite periodically high moisture content and the wood indicate a return towards initial levels of moisture.

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    Mätning av fuktkvot i sammansatta KL-träelement
  • 13.
    Andersson, Niklas
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Granskning av reklamationer och dess orsaker hos Sävsjö Trähus AB: Review of complaints and reasons for that at Sävsjö Trähus AB2007Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    House production is a process where high quality thinking is important in order to avoid customers complaints. The niche of Sävsjö Trähus AB (STAB) is to adapt each house as close as possible to the specific requirements of the costumer. This complicates the production process of the houses and also increases the risk of possible complaints. During 2006 STAB had complaints orresponding to approximately 3,1 millions SEK. The aim and the purpose of this study is to examine the complaints, the checkpoints and the different stages in the process of house building in order to counteract the origin of complaints and to give advise that can reduce the number of inspection remarks.

    One result of the study is a division of complaints in damages that are physically caused and problems that are caused by wrong decisions - caused of lack of communication between involved persons. In order to counteract the origin of complaints more intensive and clearer information should be exchanged among involved parties e.g. with the help of the business programme Pyramid. 3D blueprints should also be made in order to communicate what the house will look like when it is finished. This will make the customer aware of what has been decided in an early stage. Another recommendation is a change of the salesmen’s education in order to get a better overall vision of the house production (go beside a salesman, a draughtsman, production personnel and finally maybe

    also participate in a house rising). STAB should also continue to reward salesmen that achieve no remarks at the inspection. Further STAB should commit skilled installers or engage own assembly staff under STAB or under the salesman and demand that this staff makes all of the house risings. Further STAB should to subcontractors emphasize the need for improved packaging of woodwork.

  • 14.
    Arlid, Emma
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Karlsson, David
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Framtidsplanerat byggande för koncepthus2019Independent thesis Basic level (university diploma), 180 HE creditsStudent thesis
    Abstract [sv]

    Underhåll och fastighetsförvaltningen utgör en väsentlig del av en byggnads livscykel. Vid projekteringsfasen finns sällan en underhållsplan upprättad. Detta medför att fastighetsägarna vid övertagandet från entreprenaden får fastslå en årlig avsättning till underhållsfonden, i den ekonomiska planen, genom att beräkna en viss andel av taxeringsvärdet. Om det vid förstudie och projektering kan kartläggas vilka underhållsåtgärder som har störst påverkan på ekonomi och miljö skulle dessa åtgärder kunna tas hänsyn till redan vid uppförandet. Syftet med arbetet var att identifiera de viktigaste åtgärderna att ta hänsyn till vid underhållsplanering av en flerbostadsfastighet med bostadsrätt som upplåtelseform. Målet för studien var att selektera och rangordna de fem komponenter där materialvalen har störst betydelse ur både ekonomisk och miljömässig synpunkt. Studien har utförts med inriktning på flerbostadsfastigheter producerade som koncepthus. Då teorin gällande underhållsplaner och följderna av materialval under byggandet var mycket begränsad valdes att utföra en intervju. En underhållsplan med tre materialval på var och en av komponenterna har upprättats för att jämföra kostnader över tid. En livscykelkostnadsanalys (LCC) utfördes för att kunna bedöma vilka kostnader som belastar de olika materialalternativen, dock har driftkostnader inte inkluderats. En livscykelanalys (LCA) har genomförts i form av miljödeklarationer (EPD) för varje individuellt material med hjälp av Byggsektorns Miljöberäkningsprogram (BM). Slutsatsen blev att materialvalet av de komponenter som har störst betydelse på fastighetskostnader under en 40-årsperiod är enlig följande: 1. Fasadbeklädnad, 2. Hiss, 3. Fönster, 4. Takbeklädnad, och 5. Parkeringsbeläggning. Om totalkostnaden för dessa komponenter tas med i beräkningen redan vid förstudie och projektering skulle det kunna leda till utgifter för fastighetsägaren över tid.

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  • 15.
    Baradaran, Sam
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Al-Wedd, Amir
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Arbetsberedningar på NCC: Undersökning om hur arbetsberedningar används som ett verktyg för att effektivisera produktionsprocessen2015Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    I byggbranschen påverkar planering omkostnader och kvalité vilket gör att det krävs en bra och noggrant planering innan ett byggprojekt påbörjas. Arbetsberedningar är ett planeringsverktyg som används vid genomförandefasen med syfte att effektivisera arbetet. Denna studie beskriver hur arbetsberedningar på NCC Construction AB används och vad den har för påverkan samt hur den kan förbättras. I denna studie har fyra av NCCs arbetsplatser undersökts, där både ledning och medarbetare intervjuats. Studien visar att arbetsberedningar på många sätt är ett uppskattat planeringsverktyg av ledning och ett bra underlag för yrkesarbetarna samtidigt som flera anser sig klara sig utan dem. Arbetsledningen inser dock att det borde lägga större fokus på att göra regelbunden uppföljning av arbetsberedningarna.   

    De intervjuade anser att få förändringar behöver göras vad gäller arbetsberedningens utformning och användning. Dock har förbättringsförslag hittats och föreslagits.

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  • 16.
    Bergvall, Frida
    et al.
    Linnaeus University, School of Business and Economics, Department of Management (MAN).
    Bergfeldt, Johnna
    Linnaeus University, School of Business and Economics, Department of Management (MAN).
    Vahlberg, Vilma
    Linnaeus University, School of Business and Economics, Department of Management (MAN).
    Cirkulär ekonomi i byggbranschen: En intervjustudie över byggbranschens utmaningar och drivkrafter med cirkulär ekonomi och hur hållbar design kan bidra till en minskad avfallsmängd.2023Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    The awareness of environmental issues has increased a lot in society, but the climate is still affected to a large extent. Unfortunately, there are several aspects that affect that companies and people do not have the opportunity to act according to what is best for the climate. In the study, the theoretical material is based on the construction industry, since the industry contributes a third of Sweden's total amount of waste. Over the years, the subject of circular economy has become more current within politics, the EU and companies. Working with circular economy can reduce the environmental impact by closing the cycle and reducing the use of resources. The study identifies the challenges and driving forces that the actors in the construction industry experience with circular economy. The empirical material consists of local companies. In addition to the challenges and driving forces, an interesting section is studied that has not yet been particularly explored. It is sustainable design, which is a section in the circular economy, and the study analyzes how this section can minimize the amount of waste by closing the loop.

    Purpose

    The purpose of the study is to illuminate the topic of circular economy, by analyzing the driving forces and challenges experienced by the actors. In addition, how sustainable design can reduce the amount of waste in the construction industry is studied.

    Methodology

    An interview study has been conducted with qualitative character. Through six semistructured interviews, the empirical material has been collected digitally and at workplaces. The empirical data is based on the respondent’s knowledge and experience and has been relevant to answer the research questions.

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  • 17.
    Berkowicz, Kasper
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Undersökning av byggprodukter och material för Svanenmärkt byggnad2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Svanen är Nordens officiella miljömärkningssystem, där många olika produkter kancertifieras. Detta arbete är en del av processen för byggföretaget GBJ Bygg att uppnåSvanenmärkning av ett av sina typhus. I arbetet utförs en energiberäkning på husetför att undersöka om huset klarar Svanens energikrav. Vidare undersöks en rad olikabyggprodukter och -material och jämförs mot Svanens krav. Syftet med arbetet är att skapa en lista med produkter och material som GBJ kan använda vid byggnation av ett Svanenmärkt hus, samt att ge förslag på eventuella ändringar som behöver göras för att huset ska klara Svanens energikrav. Energiberäkningen gjordes med hjälp av datorprogrammet VIP Energy, i samråd med en energisakkunnig ingenjör, medan undersökningen av produkterna främst gjordes via insamling av information från olika hemsidor och dokument hämtade fråninternet, samt kommunikation med tillverkarna. Resultaten visar att ändringar krävs för att huset skall uppfylla energikravet. Av 81 undersökta produkt anses 58 kunna godkännas för användning vid byggnation av en Svanenmärkt byggnad.

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  • 18.
    Bexell, Ida
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lindskog, Johanna
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Mitt i en pandemi - erfarna aktörers teorier om framtidens kontor2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    In March 2020 the covid-19 pandemic was confirmed. Due to the pandemic, many office employees have been forced or have chosen to work from home. Distance work implicated that many office spaces have been left empty, and the future of the office is now questioned. 

    The office has been a place where employees go to fulfill workassignments, meet colleagues and clients. A place that creates space for exchange of experience, interaction and innovative solutions to problems. The pandemic has limited the possibility of physical meetings and to a great extent changed to digital meetings. Even though the concentrated assignments have been successfully practiced from home, the need of physical meetings has been made obvious. 

    The pandemic has resulted in an acceleration of the technical development and the future of the office has been much discussed. The purpose of this bachelor thesis is to examine the needs of the office as a meeting- and workplace after the year of 2020. To investigate the functions of the future office, several people with different work roles and experiences of office development has been interviewed. This bachelor thesis is based on interviews and the results of the respondents own theories and experiences of office trends. 

    The findings in the study reveals that a great office is a place that is optimized for the business and a place that stimulate productivity for every individual. Newly found experiences has led to the conclusion that the office has to develop in the same pace as the technological development. The office needs to be a place for impulses, meetings, exchange of experience and at the same time a place that creates the company’s culture and identity. 

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  • 19.
    Bjerhag, Otto
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Kassab, Abdulatif
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Hur kan man ersätta traditionellt portlandcement som bindemedel i betong?2022Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Concrete manufacturers claim that using substitute like blast furnace slag, fly ash and silica reduces the climate impact when used as a substitute for cement. Reducing climate emissions is an important topic for companies that currently produce concrete to achieve a sustainable society. The results have been collected by conducting interviews withexperts and sending out a questionnaire survey to concrete companies as well as some assessment through possible calculations that are linked to the survey results.

    The purpose of the survey is to find out the different substitutes used in Sweden and which substitutes may be conceivable for the future and to assess the development work for these different substitutes. The study shall provide relevant information about these different substitutes and show what effects are brought to the climate when the substitutes are used. The aim of the study is to increase understanding of current and future concrete and how these various substitutes can be useful in the future in the manufacture of concrete.

    Blast furnace slag, fly ash and silica are three different substitutes used as substitutes for cement. The most common substitute that is available and useful in Sweden is blast furnace slag, which means less climate impact.

    Conclusions drawn by the study are that these various substitutes contribute to reduced climate impact when used with cement and that substitutes are a temporary solution, meanwhile the real problem is to find new products as alternatives to limestone in cement production.

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    Examensarbet i byggteknik
  • 20.
    Björksund, Johanna
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Berntsson, Moa
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Kopplingar mellan massiva prefabricerade plattor och ytterväggar2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    En av de mest kritiska momenten mellan prefabricerade betongelement är förankringen. Den är en viktig del för att t.ex. kunna undvika fortskridande ras. Abetong AB är ett av landets ledande betongföretag inom prefabricerade betongelement och de använder tre olika förankringsmetoder. Målet är att ta reda på kapaciteten för de olika förankringsmetoderna mellan prefabricerade betongelement. Syftet är att få fram underlag för att kunna förespråka eller avråda från olika förankringsmetoder. För att kunna förespråka eller avråda från de olika metoderna har hänsyn tagits till, kapaciteter vid dragprover, de beräknade konbrottskapaciteterna, kopplingstid, hur lång tid varje förankring tar att koppla till elementen, samt kostnad, styckpris och arbetskostnad.

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    Kopplingar mellan massiva prefabricerade plattor och ytterväggar
  • 21.
    Blomberg, Johan
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Sörgårn, Alfred
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lastkapacitet hos murar byggda med C3C blocksystem -översvämningslaster2021Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Floods are the natural disaster that causes the most deaths and economic damage in the world. Sweden has been relatively spared from casualties in connection with floods, but the material damage is significant. In the future, larger and more frequent floods are expected. It is therefore interesting to study new protection barriers with higher capacity. C3C Engineering AB is a Växjö-based company that manufactures concrete blocks according to the lego principle out of waste concrete. In 2021, C3C has 99 production sites spread around Sweden. In the study, four models of stacking C3Cblock® were analyzed.The aim of the study was to produce calculation materials that can be used for stacking and placing C3Cblock® for flood protections. To calculate the capacity of the models, three horizontal loads were assumed to act on the stacking: static water pressure, hydrodynamic water pressure and floating debris load. In the study, four interviews with experts in the flood area were conducted. The interviews provided an insight into how experts at the relevant authorities view Sweden's preparedness, management, planning against floods and which criteria for protection barriers are considered important.The results from the study show that the C3Cblock® largely manage the water velocities and water heights that the authority for protection and preparedness maps for. The work also shows that the impact of floating debris has a relatively small effect compared to the hydrodynamic and hydrostatic water load. As the calculation set-up has been in ideal conditions, it is important when using the C3Cblock® for flood prevention purposes to have knowledge of terrain conditions such as base material and ground slope.

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  • 22.
    Bollvik, Mikael
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Svensson, Pontus
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Dagvattenhantering på Arenastaden i Växjö2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Rapporten behandlar projekteringen och genomförandet kring det lokala omhändertagandet av dagvatten för de fyra nybyggda arenorna på Arenastaden i Växjö. Granskningen behandlar framförallt underjordiska fördröjningsmagasin men även alternativa lösningar.

    Arbetet har genomförts med hjälp av intervjuer och studier kring olika lösningar för lokalt omhändertagande av dagvatten.

    Förändringsförslagen som presenteras bottnar i mer tid för projektering, förbättrad kommunikation och större användande av mer genomsläppliga ytor.

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    Dagvattenhantering på Arenastaden i Växjö
  • 23.
    Brandon, Daniel
    et al.
    RISE, Sweden.
    Schmid, Joachim
    ETH Zürich, Switzerland.
    Su, Joseph
    National Research Council of Canada, Canada.
    Hoehler, Matthew
    NIST National Institute of Standards and Technology, USA.
    Östman, Birgit
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Kimball, Amanda
    Fire Protection Research Foundation, USA.
    Experimental Fire-Simulator for Post-Flashover Compartment Fires2018In: SiF 2018 - The 10th International Conference on Structures in Fire, Belfast, UK, New University of Ulster, 2018Conference paper (Refereed)
    Abstract [en]

    The number of talltimber buildings around the world is rapidly increasing as a result of changes inregulations and the development of new engineered timber products. However, dueto the combustibility of timber, the fire safety of tall timber buildings hasbeen questioned. Building regulations for structural elements are based onfixed periods for which specimens shall resist exposure to a ‘standard fire’ ina fire resistance furnace. Because no distinction is made between the exposure in fire resistancetests of combustible and non-combustible specimens, less conventional testingmethods have been used for research of timber structures. Thisstudy aims to identify aspects that are important to simulate realistic fireconditions relevant to assess the structural performance of timber inpost-flashover fires. A test method is developed to replicate conditions incompartment fire tests using a furnace, that results in similar damage typesand rates of damage in the timber specimen. Based on conclusions drawn fromthese tests and test results obtained using other testing methods, theapplicability of fire resistance tests and other non-conventional tests arediscussed.

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  • 24.
    Bravo, Giangiacomo
    et al.
    University of Turin, Italy ; Collegio Carlo Alberto, Italy.
    Tamburino, Lucia
    University of Padua, Italy.
    Are two resources really better than one?: Some unexpected results of the availability of substitutes2011In: Journal of Environmental Management, ISSN 0301-4797, E-ISSN 1095-8630, Vol. 92, no 11, p. 2865-2874Article in journal (Refereed)
    Abstract [en]

    The possibility of exploiting multiple resources is usually regarded as positive from both the economic and the environmental point of view. However, resource switching may also lead to unsustainable growth and, ultimately, to an equilibrium condition which is worse than the one that could have been achieved with a single resource. We developed a dynamic model where users exploit multiple resources and have different levels of preference among them. In this setting, exploiting multiple resources leads to worse outcomes in both economic and ecological terms than the single resource case under a wide range of parameter configurations. Our arguments are illustrated using two empirical situations, namely oil drilling in the North Sea and whale hunting in the Antarctic.

  • 25.
    Citrohn, Josef
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Joachim, Sjöberg
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Vilken kvalitet håller nya bostäder?2022Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Several municipalities around Sweden report that they have a housing shortage. Reasonswhy there is a housing shortage in Sweden are partly the high construction costs andpartly the population increase that is taking place. In order to meet the shortage as well asthe increase, housing has been produced in a large volume. At the same time as a largeamount of housing is being built, it is possible to question how many of these meet theimportant qualities required for housing to be able to achieve comfort and a sense offeeling of home.The housing shortage that we are in now can be compared to the housing shortage thatSweden was in in the 50s and 60s. That then led to the million program being started inthe mid-60s to the mid-70s. Back then, a lot was built in a short time and then flaws in thequality and execution were discovered. In order to avoid deficiencies in quality, it isimportant to consider basic factors that create well-being. Some of these basic factors arethe "immeasurable values" which, in cooperation with each other, create a sense of homeand well-being in a home.Creating pleasant homes and buildings is a very complex task and therefore it is easy tomiss certain basic factors that promote well-being in homes. Therefore, studies need to bedone to see if these basic factors are included in today's new housing production. This isbecause today's construction industry can forget important points in its planning and onlythinks about costs and time. Which means that many important parameters can beforgotten and therefore create a less pleasant home.The purpose of the work is to investigate floor plans in order to gain an insight into thequality of new apartments in apartment buildings. The work examines planning solutionsfrom four municipalities that are randomly selected. In order to determine the quality ofthe housing, the work is based on the book "The home ́s immeasurable value" by OlaNylander and "Manual for analysis of housing quality" developed by research scientist atChalmers.The chosen method is a random sample study. In the study, the selected floor plans havebeen reviewed and analyzed based on four parameters of immeasurable values and oneparameter with measurable value. The four immeasurable values are movement, axiality,daylight and room organization. The measurable value is Potential for remainingresidents.The result of the work is shown through figures on the floor plans where the variousparameters are clearly shown in figures. The group has gone through different housingsizes from the four different municipalities. The sizes of the homes are 2 RAK, 3 RAKand 4 RAK.The conclusion of the study is that new homes that are built generally meet therequirements set out in "The immeasurable values of housing" and "Manual for analysisof housing quality". When designing the homes, it is shown in this study that architectsand designers have thought about the immeasurable and measurable values when theapartments were designed. The size of the home is of great importance, as it is possible toget more and better parameters in the home if they contain several rooms. In smallerhomes there are, in some cases, deficiencies in the number of parameters that lower thequality. The parameter from the Manual for Analysis of Housing Quality (MAB),Potential for remaining residents, could be found in the floor plans in a clear way.

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  • 26.
    Dahl, Arvid
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Lindström, Charlie
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Mekanisk prestanda hos traditionella träfogar kontra samtida byggbeslag2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Societies demand for environmentally friendly and sustainable construction is ever increasing. One way to meet these new demands on environmentally friendly construction is to use more wood which decreases carbon emissions through the substitution effect. This report aims to research whether traditional joinery techniques entirely executed in wood can replace contemporary joinery techniques in future construction. The goal is to show whether this is possible from a strength standpoint. The research will be limited in that it will strictly seek to study a pillar-beamconnection where the traditional joint researched will be three varying mortise and tenon joints and the contemporary joint is a joist hanger. The joints will be analyzed with calculation and experimentation where the load case aims to produce mainly shear in the joint. The results point towards it being possible to introduce this traditional joint in contemporary construction.

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    Mekanisk prestanda hos traditionella träfogar kontra samtida byggbeslag
  • 27.
    Dahl, Thor Lobekk
    et al.
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Lu, Yichang
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Thill, Sidney Carina
    Linnaeus University, School of Business and Economics, Department of Management Accounting and Logistics.
    Sustainability of Construction and Demolition Waste: A Closed-loop Supply Chain for Flat Glass2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Purpose: This thesis’ purpose is to identify a CLSC model of flat glass, including actors,waste sources, and what can be done with recycled flat glass. In addition, this researchaims to propose a cost structure of a flat glass CLSC. Thus, this thesis’ research questions(RQ) are: RQ1: How can closed-loop supply chains (CLSC) for the purpose of flat glasslook like? RQ1.A: What actors are a part of a flat glass CLSC? RQ1.B: What are thewaste sources of flat glass in a flat glass CLSC? RQ1.C: What are the uses of flat glassas secondary material? RQ2: How can a cost structure for a closed-loop supply chain(CLSC) for the purpose of flat glass look like? 

    Method: For this purpose of this thesis the researchers chose to employ a pragmatistresearch philosophy. The thesis is an exploratory qualitative study using an abductiveapproach. A case study strategy was used, and data was collected through semi-structuredinterviews and a literature review. Seven interviews were conducted with the six casecompanies.

    Findings: A flat glass CLSC consists of three phases: manufacture, use, and secondary(raw) material. The main actors are float glass manufacturer, flat glass processor/refiner,flat glass distributor, construction and demolition company, flat glass recycler, and freighthauler. Sub-actors of a flat glass CLSC are raw materials supplier, government, thirdparty contractors, container glass manufacturer, and glass wool manufacturer. Secondarymaterial occurs during flat glass manufacturing, distribution/transport, construction, anddemolition. It can be divided into three types, i.e., pure, high quality cut-offs,contaminated flat glass, and end-of-use flat glass. The possible uses of flat glass assecondary material are float glass, container glass, and glass wool manufacturing. Thecost structure for a flat glass CLSC divides cost elements into the three phases of a flatglass CLSC and six supply chain cost categories, which include manufacturing cost,distribution cost, warehousing cost, administration cost, capital cost, and installation cost.

    Theoretical Implications: This master’s thesis helps in adding to two research areas: flatglass and CLSC. By reviewing existing literature and conducting the case studies inChina, Germany, and Norway, the researchers can reflect the current practices of flat glassCLSCs in different countries, thereby adding to existing scientific research to close theresearch gap of flat glass CLSCs.

    Practical Implications: This master’s thesis contributes to practice by providing a flatglass CLSC model and cost structure which can be used as a starting point of developinga flat glass CLSC and its cost structure. In addition, this thesis is connected to anotherbigger research project in collaboration with the Linnaeus University and the city ofVäxjö, the findings from this thesis are beneficial for improving the situation of flat glassin Sweden.

    Societal Implications: By researching circularity in CDW, this master’s thesis helps notonly the city of Växjö but also other Swedish cities to improve the situation of flat glassand strive towards a full circular economy, further contributing to an increase insustainability in Sweden.

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  • 28.
    Dalstrand, Joakim
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    van der Meer, Bas
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Orsaker till och möjligheter att minska spill av gipsskivor i byggprocessen2019Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesis
    Abstract [en]

    The construction industry is facing challenges when it comes to increased costs, defective timetables and inadequate material handling. The purpose of the study is to highlight and propose possible improvements to the process of using plasterboards in the construction industry. The aim of the survey is to investigate how the use of plasterboards can be made more efficient through better collaboration between stakeholders in the construction industry and to identify shortcomings in the current construction process. Interviews were used to produce improvements and shortcomings. The result showed that there is a lack of communication between actors and when handling plasterboards. Other shortcomings in the industry are documentation of changes made during production and cooperation between actors.

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  • 29.
    Davidsson, Oscar
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Obrelius, Marcus
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Faktorer och aspekter att beakta vid solcellsinstallationer2019Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The global energy use must change, more than 80 % of the primary energy use is currently based on fossil fuels. To achieve a more sustainable development, a larger part of the energy consumption must be produced from renewable energy sources, such as solar energy.

    The purpose of this study is to exemplify practical, technical, economical and architectural factors and aspects that should be taken into consideration regarding solar cell integration in buildings. Through a case study, the Sankt Sigfrid area in Växjö was examined and bounded to four properties with possible solar cell installation as well as a possible solar cell park.

    Through theory, study visits, observations, solar study as well as technical and economical calculations, the solar cells' possible electricity production and potential savings were demonstrated. The integration proposals were compiled through the obtained theory and a survey based on how the design of building objects is affected by a solar cell installation.

    With today's generous government subsidies, there is a possibility of economic profitability regarding solar cell investments, which is reflected in the profit calculation of the result. The case study also demonstrates the complexity of solar cell installations as well as how various practical, technical, economical, architectural factors and aspects complicate the integrations onto buildings.

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  • 30.
    Dodik, Josip
    et al.
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    Dodik, Mario
    Linnaeus University, Faculty of Science and Engineering, School of Engineering.
    En jämförelse av 6 aktuella bostadsområden i Sverige med uttalad inriktning på hållbart stadsbyggande2012Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Under det senaste århundradet har det dykt upp många miljöproblem som har lett till att vi idag måste fokusera mer på en hållbar utveckling av våra städer.

    Allt fler människor väljer att bo i städer och därför är det viktigt för vår framtid att stadsplaneringen blir så hållbar som möjligt.

    Denna rapport beskriver och värderar 6 olika hållbara stadsdelar i Sverige. Dessa har identifierats och värderats utifrån 6 hållbarhetsaspekter som anses vara viktiga.

    Studierna har begränsats till hållbar utveckling inom stadsplanering, de pa- rametrar som tas upp i examensarbetet ”En jämförelse av 6 aktuella bo- stadsområden i Sverige med uttalad inriktning på hållbart stadsbyggande” är; Transport, Social Hållbarhet, Grönskande Utomhusmiljö, Hållbara Transporter, Hållbart Energisystem, Miljöanpassade Bostäder & Lokaler, Hållbart Vatten & Avlopp och Hållbar Återvinning. 

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  • 31.
    Dodoo, Ambrose
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Primary energy and economic performances of cost-optimal retrofit measures for a district heated building2019In: Forum Wood Building Baltic 2019, 27 February- 1 March, Tallinn, Estonia., Tallin University of Technology , 2019Conference paper (Other academic)
  • 32.
    Dodoo, Ambrose
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    The competitiveness of CLT: a case for an integrated approach to reduce carbon footprint2023In: 12th Forum Wood Building Nordic Conference, Växjö, September 28-29, 2023, 2023Conference paper (Other academic)
  • 33.
    Dodoo, Ambrose
    et al.
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Gustavsson, Leif
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Sathre, Roger
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Carbon implications of end-of-life management of building materials2009In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 53, no 5, p. 276-286Article in journal (Refereed)
    Abstract [en]

    In this study we investigate the effects of post-use material management on the life cycle carbon balance of buildings, and compare the carbon balance of a concrete-frame building to that of a wood-frame building. The demolished concrete is either landfilled, or is crushed into aggregate followed by exposure to air for periods ranging from 4 months to 30 years to increase carbonation uptake of CO2. The demolished wood is assumed to be used for energy to replace fossil fuels. We calculate the carbon flows associated with fossil fuel used for material production, calcination emission from cement manufacture, carbonation of concrete during and after its service life, substitution of fossil fuels by recovered wood residues, recycling of steel, and fossil fuel used for post-use material management. We find that carbonation of crushed concrete results in significant uptake of CO2. However, the CO2 emission from fossil fuel used to crush the concrete significantly reduces the carbon benefits obtained from the increased carbonation due to crushing. Stockpiling crushed concrete for a longer time will increase the carbonation uptake, but may not be practical due to space constraints. Overall, the effect of carbonation of post-use concrete is small. The post-use energy recovery of wood and the recycling of reinforcing steel both give higher carbon benefit than the post-use carbonation. We conclude that carbonation of concrete in the post-use phase does not affect the validity of earlier studies reporting that wood-frame buildings have substantially lower carbon emission than concrete-frame buildings.

  • 34.
    Dodoo, Ambrose
    et al.
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Gustavsson, Leif
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Sathre, Roger
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Energy implications of end-of-life options for building materials2008In: First International Conference on Building Energy and Environment, Proceedings Vols 1-3, Dalian, China: Dalian University Technology Press , 2008, p. 2025-2032Conference paper (Refereed)
    Abstract [en]

    The energy flows associated with the materials comprising a building can be a significant part of the total energy used in a building's life cycle. Buildings have finite life spans, and the materials from demolished buildings can be either a burden that must be disposed, or a resource that can be used. In this paper we analyse the end-of-life energy impacts of concrete, steel and wood. End-of-life options considered include reuse; recycling; downcycling; energy recovery; and disposal in landfill. We follow the life cycles of the building materials from the acquisition of natural resources through to the end of the product's life cycle. We identify possibilities and constraints for integrating more effective end-of-life material processing options into existing industrial systems.

  • 35.
    Dodoo, Ambrose
    et al.
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Gustavsson, Leif
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Sathre, Roger
    Mittuniversitetet, Institutionen för teknik och hållbar utveckling.
    Life cycle primary energy implication of retrofitting a wood-framed apartment building to passive house standard2010In: Resources, Conservation and Recycling, ISSN 0921-3449, E-ISSN 1879-0658, Vol. 54, no 12, p. 1152-1160Article in journal (Refereed)
    Abstract [en]

    Here we analyze the life cycle primary energy implication of retrofitting a four-storey wood-frame apartment building to the energy use of a passive house. The initial building has an annual final energy use of 110 kWh/m(2) for space and tap water heating. We model improved thermal envelope insulation, ventilation heat recovery, and efficient hot water taps. We follow the building life cycle to analyze the primary energy reduction achieved by the retrofitting, considering different energy supply systems. Significantly greater life cycle primary energy reduction is achieved when an electric resistance heated building is retrofitted than when a district heated building is retrofitted. The primary energy use for material production increases when the operating energy is reduced but this increase is more than offset by greater primary energy reduction during the operation phase of the building, resulting in significant life cycle primary energy savings. Still, the type of heat supply system has greater impact on primary energy use than the final heat reduction measures.

  • 36.
    Dodoo, Ambrose
    et al.
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Gustavsson, Leif
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Sathre, Roger
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Lifecycle carbon implications of conventional and low-energy multi-storey timber building systems2014In: Energy and Buildings, ISSN 0378-7788, E-ISSN 1872-6178, Vol. 82, p. 194-210Article in journal (Refereed)
    Abstract [en]

    A consequential-based lifecycle approach is used here to explore the carbon implications of conventional and low-energy versions of three timber multi-storey building systems. The building systems are made of massive wood using cross laminated timber (CLT) elements; beam-and-column using glulam and laminated veneer lumber (LVL) elements; and prefabricated modules using light-frame volume elements. The analysis encompasses the entire resource chains during the lifecycle of the buildings, and tracks the flows of carbon from fossil energy, industrial process reactions, changes in carbon stocks in materials, and potential avoided fossil emissions from substitution of fossil energy by woody residues. The results show that the low-energy version of the CLT building gives the lowest lifecycle carbon emission while the conventional version of the beam-and-column building gives the highest lifecycle emission. Compared to the conventional designs, the low-energy designs reduce the total carbon emissions (excluding from tap water heating and household and facility electricity) by 9%, 8% and 9% for the CLT, beam-and-column and modular systems, respectively, for a 50-year lifespan located in Växjö. The relative significance of the construction materials to the fossil carbon emission varies for the different energy-efficiency levels of the buildings, with insulation dominating for the low-energy houses and plasterboard dominating for the conventional houses.

  • 37.
    Dodoo, Ambrose
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Tettey, Uniben Yao Ayikoe
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Gustavsson, Leif
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Impacts of Common Simulation Assumptions in Sweden on Modelled Energy Balance of a Multi-family Building.2019In: Cold Climate HVAC 2018 / [ed] Johansson D., Bagge H., Wahlström Å., Springer, 2019, p. 689-699Conference paper (Refereed)
    Abstract [en]

    Here, we explore key input parameters and common assumptions for energy balance analysis of residential buildings in Sweden and assess their impacts on simulated energy demand of a building. Our analysis is based on dynamic hour-by-hour energy balance modelling of a typical Swedish multi-storey residential building constructed in 1972. The simulation input parameters studied are related to microclimate, building envelope, occupancy behaviour, ventilation, electric and persons heat gains. The results show that assumed indoor temperature set points, internal heat gains and efficiency of ventilation heat recovery systems have significant impact on the simulated energy demand. For microclimate parameters, the outdoor temperature, ground solar reflection and window shading gave significant variations in the simulated space heating and cooling demands. We found that input parameter values and assumptions used for building energy simulation vary significantly in the Swedish context, giving considerably different estimated annual final energy demands for the analysed building. Overall, the estimated annual final space heating demand of the building varied between 50 and 125 kWh/m2 depending on the simulation dataset used. This study suggests that site-specific parameter values may be appropriate for accurate analysis of a building’s energy performance to reduce data input uncertainties, as such factors may have a significant impact on building energy balance and energy savings of retrofit measures.

  • 38.
    Dorn, Michael
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Kozłowski, Marcin
    Silesian University of Technology, Poland.
    Serrano, Erik
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Enquist, Bertil
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Development of large-scale load-bearing timber-glass structural elements2014In: WCTE 2014 - World Conference on Timber Engineering: Proceedings, 2014Conference paper (Refereed)
    Abstract [en]

    The building industry demands ever more effective structural elements with a multitude of requirements at the same time. There is increasing interest for load-bearing glass elements which can be deployed in timber structures, e.g. in the outer façade or as column or beam elements within the building. In an on-going research project, the materials glass, timber and the adhesive combining the former have to be selected to fit each other but also suit the application. The mechanical properties are studied individually as well as in combined small-scale specimens experimentally. Furthermore,large-scale tests on beams and shear walls are performed. This is accompanied by numerical analysis to study a wide range of dimensions and variations as well as specific design situations. The final output of the project will be prototypes to beused in showcase projects.

  • 39.
    Edvardsson, Andreas
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Eriksson, Anders
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Hallbyggnadsteknik - en effektivisering av småhusproduktion2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The aim with this diploma work is to see if it is possible to transfer the technology used for industrial buildings to the production of small houses to lower the production costs. In the report, we show that the industrial building technology is possible to transfer to a small house. It also becomes more efficient to build the climate shell with our construction system compared with a traditional prefabricated small house. The total construction cost can with our system be reduced with 3-10 % depending on which facade material that is chosen.

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    FULLTEXT01
  • 40.
    Elwing, Charlotta
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Sjögren, Kristin
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Prefabricerade hus - en fråga om kvalitet, ekonomi och byggtid2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The main purpose with this diplomawork is to compare the two production methods,

    premanufacturing and on-site construction. We want to investigate if one of the methods is more advantageous than the other and why premanufactured elements are used more often. The comparisons mostly consider aspects of building time, economy and quality. We gathered the material we needed through a literature study and by interviewing active persons in the building industry.

    Building as much as possible in a production hall increases the quality since it’s not being exposed to moisture and cold before assembly. The house is built much faster when the building site becomes a montage place with different finished elements. There is no material storage at the building site since the elements are delivered when it’s time to assemble the specific element. If the elements are delivered when needed, building time will decrease which means reduced costs for the whole project.

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    FULLTEXT01
  • 41.
    Eriksson, Ylva
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Mathilda, Hult
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Karlsmo, Sara
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Livscykelanalys och livscykelkostnad för byggnad isolerad med hampfiber jämfört med alternativ isolering2021Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The concern of climate change has influenced the building sector in Sweden to become more climate neutral. The choice of building materials affect the emissions of carbon dioxide equivalents [CO₂e]. The purpose of the study is to provide more basis for the choice of insulation material looking into the climate- and cost implication of hemp fibre, cellulose and stone wool insulation. 

    The study includes an accounting-LCA from cradle to grave (A – D) and an LCC. The study looks at the climate shell of a one-story single-family house, model Eneryda from Rörvikshus, in Växjö over the lifetime 50 years. 

    The result shows that Eneryda net emissions for hemp fiber insulation is 124 CO₂e/m²BOA and the cost is 5467 SEK/m2 BOA. The result of emissions for the hempfiber-model is 12% less and the cost is 20% higher than the glass wool-model. Cellulose insulation results in net emissions of 132 CO₂e/m² and a cost of 4830 SEK/m2 BOA. Cellulose results in 5% less emissions and nearly the same cost as the glass wool building. 

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  • 42.
    Esmaeeli, Nima
    Linnaeus University, Faculty of Technology, Department of Built Environment and Energy Technology.
    Environmental performance of a cross laminated timber (CLT) building system with a focus on carbon footprint2021Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    The global construction industry accounts for more than 30% of the energy consumption and 40% of the carbon dioxide emissions, and roughly 60% of raw material extraction. A cross laminated timber building system is one solution to reduce the construction industry's environmental impact, particularly carbon footprint. Evaluating the potentials to reduce the environmental impacts of such a building system is the aim of this study. Life cycle assessment (LCA) is a comprehensive method to evaluate the environmental impact of buildings and is applied in the thesis. The environmental impacts analyzed in this thesis comprise global warming potential, acidification, ozone layer depletion, eutrophication, formation potential of tropospheric, and abiotic depletion potential. Firstly, the environmental impacts of the reference building are calculated based on environmental product declaration (EPD) through production and construction phases (A1-A5 module) of LCA; next, the transportation phase (A4) modified, and finally, the environmental impacts are analyzed based on the lowest available global warming potential figures. Reference building results show that global-warming potential, eutrophication, and abiotic depletion potential accounted for 182kgCO2-eqv / m2, 0.169 PO4 3-eqv / m2, and 0.003 kg Sb-eqv / m2, respectively, and figures decreased on an average of 40% for improved building. According to the outcomes, decision-makers should regulate material selection based on the lowest possible carbon footprint and energy consumption for the construction permission of the buildings that will be built in the future.

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  • 43.
    Falkstål, Linus
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Entreprenöriellt lärande som verktyg i en föränderlig värld: En studie om värdeskapande lärande, entreprenöriella förmågor och dess inverkningar på problemlösning i matematik.2018Independent thesis Advanced level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Studien är en pedagogisk designforskning som genom en intervention belyser hur de entreprenöriella förmågorna komplexitet, ansvar och samverkan framträder genom en kombination av metoderna värdeskapande lärande och matematisk modellering. Studien avser också att belysa om metoderna kan bidra till ett kontextuellt och strategiskt matematiskt kunnande. Resultatet består av en beskrivning och analys av de förmågor som framträtt samt en analys av de designprinciper som användes för att tillverka den uppgift som eleverna använde under projektets gång. Resultatet visar att kombinationen av metoderna värdeskapande lärande och matematisk modellering, dels genom sin verklighetsanknytning och uppmuntrande till elevers engagemang, skapar goda möjligheter för ovanstående förmågors framträdande. Den andra delen av resultatet visar att eleverna behöver ges en god förförståelse för att bibehålla ett matematiskt fokus igenom hela uppgiftsprocessen.

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    Entreprenöriellt lärande som verktyg i en föränderlig värld
  • 44.
    Forss, Jörgen
    Linnaeus University, Faculty of Technology, Department of Building and Energy Technology.
    Continuous system based on rice husks for biodegradation of a simulated textile waste water containing azo dyes2013In: Continuous system based on rice husks for biodegradation of a simulated textile waste water containing azo dyes, International Water Association, Elsevier, 2013Conference paper (Other academic)
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    2nd Water res, Singapore
  • 45.
    Fransson, Mattias
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Jamtlien, Mattias
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Slöseri i produktionsflödet: Analys av en platsgjuten betongvägg2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    High construction costs and considerable housing shortages in Sweden show that a more efficient housing construction is required. A reduction of waste in the construction process contributes to the efficiency of both time and cost. In order to increase the understanding of the importance of efficiency, this study reveals waste in the production flow of a cast in-situ concrete wall in a housing project. The study also shows where in the production flow there are improvement opportunities.

    The waste was made visible through a time study which showed great potential for improvement in the housing project resource flow, material flow and information flow. There are many indications that these shortcomings in the production flow are due to a too short construction time, which means that a good planning is not always carried out.

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    fulltext
  • 46.
    Fält, Pernilla
    Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design.
    Från 2D till BIM i ett trähusföretag: Transition from 2D-CAD to BIM in a timber frame home company2009Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    A prefabricated timber frame house previously built by Villafabriken AB has been modeled in Autodesk Revit Architectural, a 3D-program based on BIM-technology. This has been done tosee if it’s possible to produce the publications that Villafabriken demands from the designengineer’s work, and examine which possible extra values that may arise compared to traditional 2D-CAD drawing.BIM is short for Building Information Modeling. Everything is stored in a single database and a change in the project file is automatically updated across the project. BIM provides more than just drawings since information from the model can be retrieved in various ways such as lists and quantity schedules.It was possible to produce the publications that Villafabriken demanded using Revit, but BIM doesn’t only mean a new way of drawing, it also require a change in the company’s process were the information from the model is being used.

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  • 47.
    Gottfridsson, Simon
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Eriksson, David
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Riskreduceringsmetod för entreprenörer vid anbudslämnande2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Examenarbetet handlar om hur entreprenörer med hjälp av en checklista ska kunna identifiera, analysera och minimera risker som uppstår när ett förfrågningsunderlag börjar studeras till att ett eventuellt anbud lämnas. Syftet med examensarbetet är att entreprenörerna ska känna sig säkra när de lämnar anbud på ett förfrågningsunderlag. För att uppnå målet har tre stycken intervjuer genomförts och fem förfrågningsunderlag samt litteratur studerats. Resultatet av examensarbetet presenteras i form av en checklista som entreprenörerna kan använda sig av för att medvetandegöra risker vid anbudslämning och att entreprenören ska kunna använda den för att öka chansen att vinna anbudet.

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    Riskreduceringsmetod för entreprenörer vid anbudslämnande
  • 48.
    Gren Bernhäll, Oscar
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Nilsson, Adam
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Bestämning av mekaniskaegenskaper för ett bio-kompositmaterial2017Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of the work is the determination of flexural properties for thebiocomposite Durapulp. The study includes laborative tests on Durapulp andreference materials, commonly used in the building sector. Stiffness and strength of Durapulp show that it has the potential as a replacement for conventional wood-based materials.

    Download full text (pdf)
    fulltext
  • 49.
    Grennborg, Frida
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Larsson, Sofia
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Granskning av tidplaner: hur kan arbetet bli effektivare?2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Tidsplanering är en viktig del i styrningen av byggprojekt. Olika typer av tidplaner kan användas i projekt, beroende på storlek och vilken fas det befinner sig i. Studien granskar tidplanerna från tre tidigare flerbostadshusprojekt som Skanska har byggt. Utifrån detta analyseras och jämförs planerna med hur projekten lyckats med avseende på tidshållning. Syftet med studien är att ge Skanska möjlighet att utveckla tidplaneringsarbetet.

    Studien avslutas med rekommendationer kring viktiga byggstenar i tidplanerna och vilka planer som är viktiga att använda. Analysen omfattar även användandet av programmet ”Asta Powerproject” som används för upprättande av tidplanerna. 

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    fulltext
  • 50.
    Gunnarsson, Emelie
    et al.
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Andersson, Robert
    Linnaeus University, Faculty of Technology, Department of Building Technology.
    Underlag för flexibla och hållbara akutbostäder i Sverige.2020Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this project is to develop a flexible and sustainable proposal forproduction of emergency housing for homeless people in Sweden. This study will alsosuggest what should be considered in terms of materials and solutions in flexible,emergency housing for structurally homeless in society.The result shows that a flexible housing can be used for more than just emergencyhousing for the homeless. It could also be used as rental housing, senior housing or otherhousing needed. Through interviews with property owners and government officials, a listof requirements has been compiled based on their work experience.The thesis can be used as a foundation for further investigation in construction of emergency housing. Architects and other consultants involved in the building industryshould be interviewed to obtain a reliable result.

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    Underlag för flexibla och hållbara akutbostäder i Sverige
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