Utilization of limestone powder to improve the properties of self-compacting concrete incorporating high volumes of untreated rice husk ash as fine aggregate

► Limestone powder was used to produce self-compacting concrete incorporating RHA. ► The T50cm flow times increased in mixtures containing RHA or RHA and LS. ► Combinations of LS and RHA improved the workability of SCC mixtures. ► The hardened properties of the concretes were progressively improved with addition of LS.