Compressive strength and thermal conductivity of mortar containing partial replacement of fine aggregate by bottom ash

Abstract

This paper aims to study the effect of bottom ash and fly ash on the compressive strength and thermal conductivity of mortar. The porosity and density of mortar were also investigated. The replacement of fine aggregate by bottom ash was at 10 and 30% by volume of fine aggregate. The replacement of binder with fly ash was at 30 and 50% by weight of the binder. The water to binder ratio was kept at 0.40. From the experimental results, it was noted that mortar with bottom ash and mortar with fly ash had lower thermal conductivity than controlled mortar and had higher porosity and lower density. By considering at 56 days of curing time, it was found that mortar containing 10% replacement of fine aggregate by bottom ash and 30% replacement of binder by fly ash had the highest compressive strength and the lowest porosity, while mortar containing 30% replacement of fine aggregate by bottom ash and 50% replacement of binder by fly ash had the lowest thermal conductivity.