تاثير مواد و روش هاي حفاظتي بر روي خيواص مكانيكي چوب

The effects of preser vative materiols and impregnation processes on mechanical properties of Aucalyptus camaldulensis

In this investigation the effects of preservative materials and impregnation processes on mechanical properties of: Eucaltptus camaldulensis has been studied. Trees have been cut from Norabad Mamasani. For impregnation of wood the following methods have been used; (1) Bethel] method, (2) Ruping method and (3) Double Ruping method Regarding the preservatives, creosote, FCAP and CCA type A, have been chosen and 2 W.B have shown good results (NaF 24%, CrO, 35%, Asps 24% , 2,6(OII)C,H3(NO2)2 17% ) and (K2Cr207 23.8 % , H,0 12.5 % , CrO228.7 % , H3AsO4 17% , CuCo3 18% ). Regardless the kind of preservative, it has been found out that the mechanical properties have been highly decreased in the samples treated total. The reasons of reduced mechanical strength are as following: Double drying, the crack of wood, dry stress, acid hydrolysis of cellulose unit preservatives absorption, thermal treatment, volatility of preservatives.