Abstract
Usability of rice husk ash was investigated as a siliceous material for calcium silicate lightweight building materials manufactured by hydrothermal reaction. From the results, it was concluded that rice husk ash can be used as a superior siliceous material for manufacture of calcium silicate insulating materials with good thermal durability up to 1, 000°C. Characteristics of rice husk ash, viz, high SiO2 content, reactive silica phase comprising amorphous silica, cristobalite and/or tridymite, and high surface area, are favourable to the formation of well grown xonotlite which forms bodies of insulating materials. In addition, potentiality of rice husk and rice husk ash is briefly introduced as replenishable resources for industry.
