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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11292

Title: Compressive strength, static bending and specific gravity of chemically-treated stakes from three structural and general-purpose hardwoods
Authors: Antwi-Boasiako, C.
Amponsah, D.
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
URI: http://hdl.handle.net/123456789/11292
ISSN: 0972-172X
Appears in Collections:College of Agric and Natural Resources

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