SIFAT FISIKA DAN MEKANIKA PAPAN SEMEN PARTIKEL DARI LIMBAH KAYU ALAU (Dacrydium spp.) DENGAN BERBAGAI RASIO BAHAN BAKU DAN TINGKAT SUBSTITUSI GYPSUM

Using round wood as a raw material of the product the less available day. Various efforts are made to utilize wood as a raw material of a product, such as using waste from wood processing industry. The purpose of this research is to know the quality of alau (Dacrydium spp.) wood particle cement board and to know the effect of cement substitution with gypsum on the physical and mechanical properties of alau particle board (Dacrydium spp.). Research design used Factorial Random Design (RAL) factorial, with 2 factors pattern, namely factor A (cement ratio: particle) consist of 3 levels i.e. a1 (75% cement + 25% particle); a2 (80% cement + 20% particle); a3 (85% cement + 15% particle), factor B (gypsum substitution rate) consists of 2 levels i.e. b1 (5%); b2 (10%). The research results indicate that the physical properties of density (with an average value of 1.47 g / cm3) and moisture content (≤16%), and thickness development (17.47%) all meet the standards, whereas water absorption does not have value on JIS standard 5414-1992. The result of testing of the mechanical properties of bending conformity (MoE) meets the standard, and the fracture conformity (MoR) that meets the test standard is 10% gypsum substitution (b2), while internal sticking (IB) there is no requirement of value in standard JIS A 5414-1992. Comparison of the ratio of raw materials and substitution of gypsum significantly influence the physical and mechanical properties of cement.