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|Title: ||Compressive strength, static bending and specific gravity of chemically-treated stakes from three structural and general-purpose hardwoods|
|Authors: ||Antwi-Boasiako, C.|
|Issue Date: ||Aug-2012|
|Publisher: ||Journal of the Indian Academy of Wood Science|
|Citation: ||J Indian Acad Wood Sci|
|Abstract: ||Non-durable timbers, employed as substitutes
for the over-exploited traditional species for structural
applications, are chemically-treated to extend their servicelives.
However, strength properties of treated woods are
barely investigated, particularly for tropical species. Some
physico-mechanical characteristics (e.g. compressive
strength, static bending and specific gravity) of three
commonly-preserved, structural timbers (Terminalia superba,
Antiaris toxicaria and Celtis mildbraedii) were
examined after treatment with an organic preservative
(Erythrophleum suaveolens seed extract) and an inorganic
type (Pyrinex 48EC) at 0.5 and 1 % concentrations.
Treatment was through non-pressure (i.e., steeping) and
pressure methods. Specific gravities (SGs) of the stakes
(air-dried to 12–14 % mc) increased after impregnation.
Chemical retention and SGs were greater for pressuretreated
stakes at 1 % than by steeping at 0.5 %. Differences
in SG between non-pressure treated stakes at 0.5 and 1 %
were not significant (p \ 0.05). The physico-mechanical
properties were affected by the preservative type, concentration,
retention and the treatment process. Strength
properties of treated stakes rank in this decreasing order for
the hardwoods: C. mildbraedii[T. superba[A. toxicaria.
Compression and static bending strengths for control were greater than the treated. Stakes pressure-treated at greater
retentions and concentration (i.e., 1 %) lost greater strength
than those, which went through steeping at lower retention
and concentration (i.e., 0.5 %). This implies that limitations
in strength characteristics of chemically-treated wood need
be properly addressed by wood and engineering industries
in the design of standards for timber in construction.|
|Description: ||Article published in the Indian Academy of Wood Science, 2012|
|Appears in Collections:||College of Agric and Natural Resources|
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