Effects of Wood Preservatives on Physical Properties of Wood II. Effects of Different Salt Loadings of Copper-Chrome-Arsenic Composition
Keywords:<i>Pinus roxburghii</i>, <i>Mangifera indica</i>, salt retention, hygroscopicity, equilibrium moisture content, dimensional stability, shrinkage, swelling, preservation, copper-chrome-arsenic preservatives
AbstractEffect of different salt loadings of copper-chrome-arsenic (CCA) preservative on shrinkage, swelling, and equilibrium moisture content at various relative humidities has been reported for Pinus roxburghii and Mangifera indica. At very low salt retentions, treated wood shows excessive shrinkage and swelling, which reaches a maximum and then falls off with increasing salt loadings. The two woods differ as to the position of these maxima. At higher retention levels, shrinkage and swelling are reduced, but the wood becomes more hygroscopic. The increased hygroscopicity is probably due to CCA salt and the additional water is held by the salt molecules deposited in the cell lumens. At low salt retentions, equilibrium moisture content is lowered at all relative humidities. The general sigmoid character of the adsorption curves is maintained at all levels of retentions.
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