Influência do tratamento preservativo com CCA-C na estabilidade dimensional da madeira de Eucalyptus

Abstract

This study aimed to evaluate to what extent the treatment with the preservative CCA-C affects the dimensional stability of Eucalyptus wood treated on autoclaved. 78 samples were used (39 untreated and 39 treated with CCA-C) of Eucalyptus urophylla x E. grandis wood, which were submitted to different conditions of adsorption and desorption, for subsequent calculation of shrinkage and swelling of the wood. The treated wood pieces had a higher radial swelling values (a Radial = 4.95%) and tangential (tangential a = 6.68%) than the untreated wood (a = 4.30% radial and tangential a = 5.88%) when they came out of a condition of 25 ° C and 60% relative humidity, and were submitted to a saturation condition at 30 ° C and 80% relative humidity. When they left the dry condition and were subjected to the condition of 25 ° C and 60% relative humidity for 30 days, effect of preservative treatment with CCA-C only in tangential swelling were observed. However, when the saturated wood pieces were submitted to anhydrous condition, the presence of metal salts did not affect the shrinkage values. Generally, the preservative treatment with CCA-C has not improved dimensional stability, and the anisotropy coefficient of Eucalyptus urophylla x E. grandis wood.