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Amiandamhen, StephenORCID iD iconorcid.org/0000-0002-8790-8964
Publications (10 of 16) Show all publications
Foti, D., Adamopoulos, S., Voulgaridou, E., Voulgaridis, E., Passialis, C., Amiandamhen, S. & Daniel, G. (2019). Microstructure and compressive strength of gypsum-bonded composites with papers, paperboards and Tetra Pak recycled materials. Journal of Wood Science, 65(1), 1-8, Article ID 42.
Open this publication in new window or tab >>Microstructure and compressive strength of gypsum-bonded composites with papers, paperboards and Tetra Pak recycled materials
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2019 (English)In: Journal of Wood Science, ISSN 1435-0211, E-ISSN 1611-4663, Vol. 65, no 1, p. 1-8, article id 42Article in journal (Refereed) Published
Abstract [en]

The incorporation of recycled papers, paperboards and Tetra Pak as filling materials in brittle matrices presents aninteresting approach in the utilization of waste materials for building construction. This paper examines the compressivestrength and microstructure of gypsum-bonded wastepaper-based composites. Recycled wastepaper of varioustypes (office paper, magazine paper and newspaper), cardboards, paper boxes and Tetra Pak were shredded to shortlength strips of about 4 × 18 mm. The shredded materials were used as filling materials in natural gypsum in a ratioof 1:3 (v/v), and water was added to the mix. The paste was formed in cylindrical samples measuring 10 cm in lengthand 5 cm in diameter. Seven different types of composites were produced depending on the material used. Thecomposite products with newspaper and magazine paper had significantly lower density and compressive strength(p < 0.05) than the others. However, the differences were small to have any practical importance. The density valuesranged between 1.26 and 1.34 g/cm3, and compressive strength was the lowest (4.48 N/mm2) in the gypsum–magazinepaper composites and the highest (6.46 N/mm2) in the gypsum–Tetra Pak I composites. Since the samplesproduced in this study exhibited adequate compressive strength, the products could be suitable for such applicationsas interior walls in building constructions. Scanning electron microscopy (SEM) examination of the fractured surfacesrevealed needle-like structures of gypsite crystals surrounding the fibers, which indicates good adhesion between thehydrophobic matrix and lignocellulosic fibers.

Place, publisher, year, edition, pages
Springer, 2019
National Category
Wood Science Composite Science and Engineering
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-89175 (URN)10.1186/s10086-019-1821-5 (DOI)000483579900001 ()
Funder
Swedish Research Council, 942-2016-2Swedish Research Council Formas, 2017-21The Kamprad Family Foundation, 20160052The Kamprad Family Foundation, 2017-19
Available from: 2019-09-17 Created: 2019-09-17 Last updated: 2019-09-25Bibliographically approved
Amiandamhen, S., Meincken, M. & Tyhoda, L. (2019). Phosphate bonded natural fibre composites: a state of the art assessment. Applied Sciences (1), Article ID 910.
Open this publication in new window or tab >>Phosphate bonded natural fibre composites: a state of the art assessment
2019 (English)In: Applied Sciences, ISSN 2523-3963, no 1, article id 910Article, review/survey (Refereed) Published
Abstract [en]

Over the last few decades, innovative wood composite products and processes have created markets for new and existing products. Inorganic bonded fibre composites have been developed for high performance applications using conventional cement and concrete. The demands for wood based composites along with increasing economic and environmental concerns on conventional wood products necessitate moving beyond the traditional processing methods to more cost-effective and environmentally friendly approaches. In the wake of the twenty-first century, a fast-setting phosphate binder with a low carbon footprint was developed, which can alternatively be utilized in wood composite development. This paper reviews the recent progress in phosphate bonded composite products, based on published literature from the last two decades. A brief background on Portland cement based natural fibre composites is presented. In addition, the mechanism of the formulation of phosphate binders, the effect of aggregates in the materials and the environmental benefits accruable to such materials are discussed.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Composites; Environmental benefits; Lignocellulosic fibres; Phosphate binder
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-87093 (URN)10.1007/s42452-019-0910-9 (DOI)
Projects
Development of low-carbon footprint binder for wood composites
Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-28Bibliographically approved
Amiandamhen, S., Montecuccoli, Z., Meincken, M., Barbu, M. & Tyhoda, L. (2018). Phosphate bonded wood composite products from invasive Acacia trees occurring on the Cape Coastal plains of South Africa. European Journal of Wood and Wood Products, 76(2), 437-444
Open this publication in new window or tab >>Phosphate bonded wood composite products from invasive Acacia trees occurring on the Cape Coastal plains of South Africa
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2018 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 76, no 2, p. 437-444Article in journal (Refereed) Published
Abstract [en]

The feasibility of manufacturing phosphatebonded wood composite board products from four locallyoccurring invasive acacia tree species (Acacia cyclops, A.saligna, A. mearnsii and A. longifolia) was studied usinga formulated magnesium oxide (MgO) and monopotassiumphosphate (KH2PO4) binder system. The optimizationfor the manufacturing process was studied using a centralcomposite statistical design, whereupon the following factorswere considered, i.e. KH2PO4:MgO ratio, the fly ashcontent as partial replacement for the binder and the woodcontent as a ratio of wood to the total inorganic content.A fitted response surface plot was used to show the effectof the main factors and their interactions on the measuredboard properties. A response surface model was developedto predict the parameters leading to the best board properties.All physical properties evaluated met or exceededthe minimum requirements for low density particleboards.The results showed that the variables considered have significanteffects on the physical properties of the boards.The optimum composite manufacturing process for makingdurable products within the scope of the studied specieswas found to be a KH2PO4/MgO ratio of 1.66, an ashcontent of 2.7% and a wood/inorganic ratio of 0.96 for theselected wood species.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81153 (URN)10.1007/s00107-017-1191-x (DOI)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-25Bibliographically approved
Amiandamhen, S., Meincken, M. & Tyhoda, L. (2018). The effect of chemical treatments of natural fibres on the properties of phosphate‑bonded composite products. Wood Science and Technology, 52(3), 653-675
Open this publication in new window or tab >>The effect of chemical treatments of natural fibres on the properties of phosphate‑bonded composite products
2018 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 52, no 3, p. 653-675Article in journal (Refereed) Published
Abstract [en]

Phosphate-bonded composites are an emerging class of building materials produced from natural fibres and phosphate based cement pastes. They are durable and possess mechanical properties similar to those of Portland cement. However, the moisture absorption of natural fibre can lead to swelling which may result in the reduction in the mechanical strength properties and eventually negatively affect the long-term performance and dimensional stability of the products. This study was aimed at the modification of some properties of selected biomaterial residues in order to enhance the final properties of the phosphate-bonded composite product. Three different treatments were evaluated viz. 1% caustic alkali, 1% acetic anhydride and hot water on natural fibres derived from slash pine, black wattle and bagasse. The effect of the treatment on the fibres was evaluated via HPLC, SEM and FTIR. Further, the performance of the treated fibres was evaluated in composite panels bonded with magnesium phosphate (MgPO4) and calcium phosphate (CaPO4) cement pastes against the controls. The manufactured panels were tested for flexural properties and dimensional stability. In the MgPO4-bonded panels, the MOR increased from 0.55 MPa for untreated bagasse panels to 0.79 MPa for alkalised panels. Similarly, the MOE increased from 150.04 MPa for untreated bagasse panels to 175.65 MPa for alkalised panels. In untreated MgPO4-bonded panels, the mean density was 0.76, 078 and 0.75 g/cm3, while in alkalised panels, the mean density was 0.81, 0.81 and 0.81 g/cm3 for wattle, pine and bagasse panels, respectively. In the bagasse panels, the water absorption was 54.61% for untreated, 48.74% for hot water extracted, 42.21% for acetylated and 36.44% for alkalised MgPO4-bonded panels. This represents a percentage improvement of 11, 23 and 33%, respectively. Alkali-treated fibres had the best effect overall for all measured properties.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81152 (URN)10.1007/s00226-018-0999-9 (DOI)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-25Bibliographically approved
Amiandamhen, S., Meincken, M. & Tyhoda, L. (2017). Calcium phosphate bonded wood and fiber composite panels: production and optimization of panel properties. Holzforschung, 71(9), 725-732
Open this publication in new window or tab >>Calcium phosphate bonded wood and fiber composite panels: production and optimization of panel properties
2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 9, p. 725-732Article in journal (Refereed) Published
Abstract [en]

The development of phosphate bonded composites with properties comparable with those of current Portland cement bonded products has been investigated. More precisely, the focus of the study was the optimization of calcium phosphate cements in combination with wood processing residues slash pine (Pinus elliottii Engelm.) planer shavings, Black wattle (Acacia mearnsii De Wild.) residues, Blue gum (Eucalyptus globulus Labill.) residues, hemp (Cannabis Sativa L.) hurds and dried crushed sugarcane bagasse (Saccharum officinarum L.) as well as pulp mill sludge and waste paper. A central composite design (CCD) for the response surface methodology (RSM) was applied for selection of the proper parameters. Mechanical tests were conducted on the composite products and the effect of the processing variables was evaluated based on the Pareto analysis of variance. The density of the wood-based panels ranged from 0.68 to 1.21 g cm−3, that of the agricultural fibers from 0.59 to 1.15 g cm−3 and that of the paper pulp panels from 0.81 to 1.21 g cm−3. The modulus of elasticity (MOE) data of the panels ranged from 1.63 to 4.92 MPa for wood, from 0.37 to 3.28 MPa for agricultural fibers and from 0.65 to 3.87 MPa for paper-pulp-based fibers. The physical properties of the composite products met the requirements for Portland-cement-bonded particleboards (EN 634-2, 2007).

Place, publisher, year, edition, pages
Germany: Walter de Gruyter, 2017
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81154 (URN)10.1515/hf-2016-0199 (DOI)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-21Bibliographically approved
Amiandamhen, S., Meincken, M. & Tyhoda, L. (2017). Phosphate bonded natural fibre composites. In: Forest Sector Innovations for a Greener Future, June 12-16, 2017: . Paper presented at IUFRO 2017 Division 5 Conference and 60th SWST International Convention SWST, June 12-16, 2017, Canada. Vancouver, Canada: International Union of Forest Research Organizations
Open this publication in new window or tab >>Phosphate bonded natural fibre composites
2017 (English)In: Forest Sector Innovations for a Greener Future, June 12-16, 2017, Vancouver, Canada: International Union of Forest Research Organizations , 2017Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The demands for wood based composites along with increasing economic and environmental concerns on conventional wood products necessitate moving beyond the traditional processing methods to more costeffectiveand environmentally friendly approaches. In the wake of a fast-setting phosphate binder with a low carbon footprint, this study investigates the potential of different waste residues incorporated in formulated magnesium and calcium phosphate binders to produce commercially-viable composite products. The residues include forest waste from alien invasive trees, agricultural processing waste such as bagasse and hemp hurds, and wood-based industrial residues including papermill sludge, waste paper and sawmill waste. A wide range of composite products were produced that met the requirements of Portland cement particleboard (EN 634: 2007). This study presents the result of the process optimization and test conducted to product technical specifications. The development of phosphate bonded natural fibre composites utilizing lignocellulosic residues promises to bring economic potential to developing countries.

Place, publisher, year, edition, pages
Vancouver, Canada: International Union of Forest Research Organizations, 2017
Keywords
Lignocellulosic residues, optimization, phosphate cement, wood composites
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81252 (URN)
Conference
IUFRO 2017 Division 5 Conference and 60th SWST International Convention SWST, June 12-16, 2017, Canada
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-28Bibliographically approved
Amiandamhen, S., Meincken, M. & Tyhoda, L. (2016). Effect of bark on the physical and mechanical properties of phosphate bonded wood composites of black wattle (Acacia mearnsii De Wild). In: Susan LeVan-Green (Ed.), Forest resource and Products: Moving toward a sustainable future, 59th International Convention of the Society of Wood Science and Technology, Curitiba, Brazil, March 6 -10, 2016: . Paper presented at 59th International Convention of Society of Wood Science and Technology, Curitiba, Brazil, March 6 -10, 2016 (pp. 165-173). Curitiba, Brazil
Open this publication in new window or tab >>Effect of bark on the physical and mechanical properties of phosphate bonded wood composites of black wattle (Acacia mearnsii De Wild)
2016 (English)In: Forest resource and Products: Moving toward a sustainable future, 59th International Convention of the Society of Wood Science and Technology, Curitiba, Brazil, March 6 -10, 2016 / [ed] Susan LeVan-Green, Curitiba, Brazil, 2016, p. 165-173Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Curitiba, Brazil: , 2016
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81299 (URN)978-0-9817876-6-4 (ISBN)
Conference
59th International Convention of Society of Wood Science and Technology, Curitiba, Brazil, March 6 -10, 2016
Note

Ej belagd 190328

Available from: 2019-03-22 Created: 2019-03-22 Last updated: 2019-03-28Bibliographically approved
Izekor, D., Amiandamhen, S. & Awenagbiku, E. (2016). Effect of taper and sawing methods on log conversion among selected sawmills in Edo State, Nigeria. Nigerian Journal of Forestry, 46(1-2), 1-6
Open this publication in new window or tab >>Effect of taper and sawing methods on log conversion among selected sawmills in Edo State, Nigeria
2016 (English)In: Nigerian Journal of Forestry, Vol. 46, no 1-2, p. 1-6Article in journal (Refereed) Published
Abstract [en]

This study was carried out to determine the effect of taper and sawing methods on log conversion among selected sawmills in Egor andOvia-North East Local Government Areas of Edo State. Ten representative sawmills and thirty round logs were sampled for eachspecies making a total of 300 logs based on the relative abundance of available timber species were sampled. The diameter of the logs,length and girth at small and large ends were measured before conversion. The data were analyzed using descriptive statistics. Theresults obtained showed that Egor Local Government Area has the highest frequency of the selected species representing 56% of totallogs sampled while Ovia North-East Local Government Area has 44% of total logs sampled. Conversion efficiency varied from 56.49to 76.26%. Factors such as inherent defect in the timber, age of the machine and the severity of the log taper affected conversionefficiency at the sawmills. Lumber recovery efficiency increases with bigger log, short log length and narrower taper. Therefore, logsize, taper and log length have positive relationship on lumber recovery efficiency.

National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81162 (URN)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-21Bibliographically approved
Amiandamhen, S., Meincken, M. & Tyhoda, L. (2016). Magnesium based phosphate cement binder for composite panels: A response surface methodology for optimisation of processing variables in boards produced from agricultural and wood processing industrial residues. Industrial crops and products (Print), 94, 746-754
Open this publication in new window or tab >>Magnesium based phosphate cement binder for composite panels: A response surface methodology for optimisation of processing variables in boards produced from agricultural and wood processing industrial residues
2016 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 94, p. 746-754Article in journal (Refereed) Published
Abstract [en]

This study investigates the potential use of magnesium based phosphate cement prepared from a heavy magnesium oxide and monopotassium phosphate as a binder for the production of composite panels using bio-based industrial residues such as bagasse, hemp hurds, pine sawdust, paper mill sludge and wastepaper as raw materials. These residues were used to produce light-weight and durable materials that can compare with current Portland cement based products. The phosphate binder is fast setting, cold curing and has a low carbon footprint compared to its Portland cement counterpart. The development of phosphate bonded board products promises to reduce the energy requirements in the manufacturing process of board products, and also provides an alternative route for disposal or value addition to bio-based residues by developing environmentally friendly products. The board manufacturing process was laid out on a central composite design (CCD) to model the response variable, utilizing as much residues as technically feasible. The design allowed for the production of low and medium density boards that can be used for non-structural interior finishes and partition boards. Response surface methodology (RSM) was used to show the relationships between the production variables and predict the board property by variable optimisation. Tests of mechanical and physical properties were conducted on the boards. The density of hemp boards ranged from 0.59–0.83 g/cm3, bagasse boards ranged from 0.54–0.78 g/cm3, pine boards ranged from 0.58–0.84 g/cm3, paper sludge boards ranged from 0.68–0.81 g/cm3 and wastepaper boards ranged from 0.67–0.81 g/cm3. The study has shown that it is feasible to produce phosphate based board products using bio based industrial and agricultural residues. The physical properties of the products met the minimum requirements for cement bonded particleboard (EN 634:2007) and LD-1 grade particle board (ANSI 208.1:1999).

Place, publisher, year, edition, pages
Elsevier, 2016
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81155 (URN)10.1016/j.indcrop.2016.09.051 (DOI)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-21Bibliographically approved
Amiandamhen, S., Izekor, D. & Balogun, A. (2016). Performance characteristics of treated kenaf bast fibre reinforced cement composite. Journal of the Indian Academy of Wood Science, 13(2), 156-160
Open this publication in new window or tab >>Performance characteristics of treated kenaf bast fibre reinforced cement composite
2016 (English)In: Journal of the Indian Academy of Wood Science, ISSN 0972-172X, Vol. 13, no 2, p. 156-160Article in journal (Refereed) Published
Abstract [en]

This study investigated the effect of pretreatment on the properties of kenaf fibre cement boards. Homogenous fibre cement boards were made from kenaf bast fibres, cement and water. The fibres were cut into smaller sizes, mixed with cement and water and formed in rectangular moulds. After demoulding, the boards were cured for 28 days. The fibres were treated at three levels which included hot water, calcium chloride (CaCl2), hot water + CaCl2 and a control (untreated). The fibre cement boards were tested for Modulus of Rupture (MOR), Modulus of Elasticity (MOE), Internal Bond (IB), Water Absorption (WA), Thickness Swelling (TS) and Linear Expansion (LE). The results showed that the mean MOR ranged from 1.31 to 8.25 MPa; the mean MOE from 78.0 to 1636.3 MPa for all treated boards. Mean water absorption ranged from 27.52 to 67.64% and the mean thickness swelling from 14.51 to 48.01% for all treated boards. Statistical analysis showed that the effect of the pretreatment was significant on the properties evaluated (p < 0.05). The study concluded that boards produced from hot water combined with CaCl2 treated fibres exhibited the best mechanical and physical properties.

Place, publisher, year, edition, pages
India: Springer, 2016
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-81156 (URN)10.1007/s13196-016-0180-8 (DOI)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-03-21Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-8790-8964

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