Durability of treated wood Corymbia torelliana and Eucalyptus grandis x Eucalyptus urophylla against subterranean termite
D Junior Verly Lopes, J Benigno Paes, P N de Medeiros Neto, G dos Santos Bobadilha
This work aimed to analyze the durability of woods against termite Nasutitermes corniger Motsch. Fence posts from this study were collected in Pinheiros, north of Espírito Santo state, Brazil. Used the Corymbia torelliana and Eucalyptus grandis x Eucalyptus urophylla species with 11 and 9 years, respectively and plant spacing of 3.00 x 2.00 m. Were used 72 samples from discs removed the 0.50 m of fence posts basis. The samples had 1,5 x 1,0 x 2,0 cm (Radial x Tangential x Longitudinal), 36 for each species and 18 for position 0 to 1,5 cm and 18 for position 1,5 to 3,0 in radial deep, treated with 2% active ingredients of CCA type C in oxide base, in diameter classes 8-10 cm; 10-12 cm and 12-14 cm in force feeding test. Measured the heartwood and sapwood content, heartwood: sapwood ratio and retention of CCA in wood. The specifications of the test, weight loss, scores attributed the sampless were taken according to ASTM D 3345 (2005). Statistical analysis was performed using t-test for independent samples for characteristics of the wood. The weight losss and the scores awarded to the specimens were processed to satisfy the principles of ANOVA. Used the Tukey test for the sources of variation detected as significant by F test. The results indicated that the larger weight loss are associated with the radial position 1.5 to 3.0 cm. Probably by not receive preservative solution, because of impermeability of the heartwood. In absolute terms the largest weight loss were observed for wood Corymbia torelliana. The preservative treatment provides high strength hardness, confirmed by the scores close to 10. In general the wood Eucalyptus grandis x Eucalyptus urophylla presented the best characteristics for the preservation.