COMPATIBILITY OF FOUR TROPICAL WOOD SPECIES AND SAGO STEM TO CEMENT AND PROPERTIES OF MANGIUM CEMENT BONDED PARTICLEBOARD

The quality of the cement board depends on the compatibility between cement and particles from lignocellulosic biomass. The purpose of this study was to determine the compatibility between cement and particles from four tropical wood namely mangium ( Acacia mangium Willd), teak ( Tectona grandis Linn. F.), gelam ( Melaleuca leucadendron (L.), dadap ( Erythrina variegat a L.), and sago stem ( Metroxylon sago Rottb.), and to determine the physical and mechanical properties of the mangium cement board produced by adding magnesium chloride (MgCl 2 ) as an accelerator. This research was conducted in two steps. The first step consisted of measuring the hydration temperature of a mixture of cement with particles from the four wood species and sago stems by adding magnesium chloride (MgCl 2 ), with variations of 0%, 2.5%, 5%, and 7.5% based on the cement weight. Two types of mixtures from the first step were then used in the second step, namely the manufacture of cement board. The cement board was made using a weight ratio of mangium particles:cement:water of 1:2.7:1.35. The board is made with a target density of 1.2 g/cm 3 . Physical and mechanical testing refers to the ISO 8335-1987 standard. The results of the hydration temperature showed that all of the mixtures were classified into “low inhibition”, except for mixture between cement and mangium particles without a catalyst which was included in the classification of “moderate inhibition”. While the results of cement board tests indicate that the cement boards made from mangium wood particles with 5% MgCl 2 addition had better properties compared to mangium cement boards without catalysts.