Effect of bottom ash as fine aggregate on strength of concrete

Abstract

This research was aimed to study the effect of bottom ash (BA), as fine aggregate in fly ash concrete and cement-only concrete, on strength of water-cured and uncured concrete. The water to binder ratios were 0.35 and 0.55 to represent high strength and normal strength concrete, respectively. The weight percentages of replacement of cement by fly ash were 0 and 30%. The replacement ratios of bottom ash as fine aggregate were 0, 10 and 30% by volume of fine aggregate. The results indicated that the slump and setting time of concrete increased with the increase of bottom ash content. In contrast, the compressive and tensile strength decreased with the increase of bottom ash content. From the curing sensitivity index, it was showed that the fly ash concrete required longer curing period than cement-only concrete. In case of high strength concrete, the use of bottom ash in fly ash concrete can reduce curing sensitivity of concrete