Pengaruh Rasio Komposisi Semen dan Partikel Terhadap Kualitas Papan Semen Partikel dari Limbah Industri Pensil

Abstract

Cement-Bonded Particleboard made of pencil industry waste has not to developed in Indonesian. The main objective of this research was to evaluate the physical and mechanical properties of cement bonded from pencil shavings particles, determine the optimum cement-to-particle ratio and analyze the effect of cement/particle ratio on the quality of cement-bonded particleboard. The treatment of cement/particle ratio were 90:10; 85:15; 80:20 and 75:25. The chemical additives were magnesium chloride (MgCl2) as an accelerator amounting to 5% based of the weight of cement. Cement-Bonded Particleboard was made with size 25cmx25cmx1cm with 1,2 g/cm3as a density target. Methods of this research were two steps curing. The first step was air curing using cold press for ±4 days and continued of second step was oven curing at 80̊ C for 24 hours. The result of the research showed that cement-bonded particleboard produced density value around 0,73-1,13 g/cm3, moisture content 8,37-12,16%, water absorption on immersion 2 hours and 24 hours around 23,78-43,48% and 27,33-51,90%, thickness swelling on immersion 2 hours and 24 hours around 0,79-1,82% and 1,39-2,89%, modulus of elasticity around 114,21-880,17 kg/cm2, modulus of rupture around 7,32-18,52 kg/cm2 and internal bond around 0,88-1,56 kg/cm2. Density, water content and the thickness swelling of 2 hours and 24 hours have fulfilled the standard of JIS A 5417-1992. The mechanical properties were not fulfilled yet. Cement-to-particle ratio in the research did not significant effect on the quality of cement-bonded particleboard. The effect of cement/particle ratio on the research showed that 80:20 is very good compared from 90:10; 85:15 and 75:25.