Swelling characteristics of conventional and organic preservative-treated porous tropical utility hardwood [ceiba pentandra (l.) gaertn.]
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Date
2013
Journal Title
Journal ISSN
Volume Title
Publisher
Special Topics & Reviews in Porous Media — An International Journal
Abstract
Overexploitation of endangered timbers necessitates utilization of chemically treated nondurable species. Ceiba pentandra
is porous, dimensionally stable in dry service conditions, and has regular export of treated products. Swelling
characteristics of treated woods are hardly studied. This work provides a scientific bridge to this gap. Influence of
Maneb/Lambda mixture and Erythrophleum suaveolens bark extract on the swelling of C. pentandra was investigated
by water immersion for 24 h. Directional swelling was greatest tangentially (1.4–2.5 times greater than radial swelling)
and least along longitudinal directions (90–360 times less than tangential surfaces) depending on solvent type. Untreated
stakes soaked in the three solvents swelled more than treated stakes in water. Tangential swelling was greater for
untreated stakes in E. suaveolens (9.20 § 0.02%) and Maneb/Lambda (9.32 § 0.02%) than in water (8.10 § 0.01%);
the contrary occurred for longitudinal and radial swellings. Maneb/Lambda-treated stakes swelled more tangentially
in water (7.36 § 0.13%) but less at radial directions (2.89 § 0.01%) than those treated with E. suaveolens (7.10 §
0.00% and 3.28 § 0.02%, respectively). Volumetric swelling was greater for untreated stakes in all solvents (12.66 §
0.60% in water/14.74 § 0.66% in Maneb/Lambda) than for Maneb/Lambda- and E. suaveolens-treated stakes in water
(10.51 § 0.14% and 10.62 § 0.02% respectively). Thus, preservative-chemicals would protect nondurable timbers
against biodeterioration with the added advantage of reducing moisture-absorption capacity of engineered products in
service conditions.
Description
Article published in the Special Topics & Reviews in Porous Media — An International Journal, 2013
Keywords
dimensional stability, Maneb/Lambda mixture, moisture content, organic preservative, porous medium, shrinkage, dimensional stability, Maneb/Lambda mixture, moisture content, organic preservativolumetric swelling
Citation
Special Topics & Reviews in Porous Media — An International Journal, 4 (2): 137–145 (2013)