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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13014

Title: Solvent extraction of inhibitory substances from three hardwoods of different densities and their compatibility with cement in composite production
Authors: Boakye Boadu, Kwadwo
Antwi-Boasiako, Charles
Ofosuhene, Linda
Keywords: Dimensional stability
Extractive
Pretreatment
Thickness swelling
Wood–cement compatibility
Issue Date: Oct-2018
Publisher: J Indian Acad Wood Sci
Citation: J Indian Acad Wood Sci, 15(2):140–148
Abstract: Chemical pre-treatment of wood to remove extractives improves timber’s compatibility with cement and produces strong composites. The chemicals often used are expensive and environmentally-destructive. Data on eco-friendly solvents for such extraction are deficient, which makes it difficult to recommend the most effective solvent for wood pre-treatment. This study compared the extracting potentials of three readily available and environmentally friendly solvents (i.e. ethanol, hot and cold water) and their influence on the thickness swelling, modulus of rupture and shear strength of composites produced from three hardwoods of different densities [Klainedoxa gabonensis (high), Entandrophragma cylindricum (medium) and Triplochiton scleroxylon (low)]. Hot water removed more extractives (e.g. 2.21 ± 0.07% from T. scleroxylon) than ethanol (0.925 ± 0.02% from T. scleroxylon) and cold water (0.865 ± 0.02% from T. scleroxylon). Composites from hot water-extracted sawdust least swelled and were stronger than those produced from the ethanol-, cold water- and non-extracted sawdust. T. scleroxylon boards from both extracted and non-extracted sawdust had the lowest thickness swelling and greatest strength. Hot water was found to be more effective than cold water and ethanol for pre-treating the sawdust, especially those from the light timbers (e.g. T. scleroxylon) before mixing with cement in producing strong and dimensionally stable composites. Utilization of sawdust, especially from these timbers, would contribute to increasing the raw material base for the wood–cement board manufacturing or the composite industry.
Description: This article is published in J Indian Acad Wood Sci and also available at https://doi.org/10.1007/s13196-018-0219-0
URI: http://hdl.handle.net/123456789/13013
http://hdl.handle.net/123456789/13014
ISSN: 10.1007/s13196-018-0219-0
Appears in Collections:College of Agric and Natural Resources
College of Agric and Natural Resources

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