Investigation on the mechanical property variation on timber caused due to the thermal and chemical modification

Abstract

Timber is a popular natural construction material since ancient time. Quality of timber varies with physical and mechanical properties. Timber modification techniques are used to improve durability and dimension stability of the timber. The aim of this research is to create a data base on mechanical property variation on timber caused due to the thermal and chemical modifications. Two distinct industrial surveys were conducted clusters-based and companies based survey to identify most abundantly utilized timber for structural applications and most abundantly utilized preservative techniques in Sri Lanka. Through the industrial survey results, three timber species were selected and specimens were prepared. Industrial survey concluded five major treatment methods; kiln dry,dipping,impregnation,brushing and spraying. Then prepared specimens were treated by the above timber modifications techniques. Compression parallel to grain and static bending test (central loading) were conducted according to BS 373: 1957 standard. According to test results, in Alastonia timber dipping & kiln dry and impregnation & kiln dry, in Rubber timber kiln dry, dipping & kiln dry and dipping and in Mango timber brushing and spraying modification techniques exemplified significant mechanical properties (compression parallel to grain,MOR (modulus of rupture) and elasticity) improvement