Abstract:
Recycled aggregate concrete (RAC) involves the reuse of demolished concrete by replacing natural aggregates. Industrial and agricultural wastes which possess pozzolanic nature are used as supplementary cementitious materials to improve concrete properties. This study investigates the combined effect of varying proportions of bagasse ash (BA) and fly ash (FA) on RAC properties such as compressive strength, water permeability, drying shrinkage, water absorption and sulphate expansion, and hydration temperature of mortar. An overall thirty percent replacement of cement with BA and FA was employed. The experimental results indicated improvement in compressive strength of RAC with inclusion of BA and FA. Water permeability, water absorption, drying shrinkage and sulphate expansion of RAC were also reduced by the introduction of BA and FA. Maximum rise in hydration temperature of cement mortar was also decreased by substitution of BA and FA.