Research on the use of rice husk ash in fabrication of insulating refractory concrete

Tóm tắt

This study focuses on manufacturing insulating refractory concrete using alumina cement with various lightweight aggregates such as perlite and vermiculite. We used rice husk ash to partially replace imported vermiculite in the mix proportions. Experiments were conducted to determine chemical composition, particle size of raw materials, and bulk density, thermal conductivity, mineral composition of insulating concrete. The optimal mixes, M9 and M10 (containing 10% and 15% rice husk ash, respectively) met the requirements for bulk density (from 0.760 to 0.813 g/cm³), thermal conductivity (from 0.106 to 0.116 W/m.K), as well as compressive strength of samples fired at 800^oC and 1000^oC. The replacement of 10-15% vermiculite with rice husk ash contributes to reduce production costs, utilize the rice husk ash resource, and foster circular economic development in Vietnam.