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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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