Effect of Utilization of Different Type of Mineral Admixture On Fresh And Hardened Properties of Cementitious Systems

Abstract

In this study, the effect of mineral admixture utilization on fresh and some hardened state properties of cement paste and mortar mixtures were investigated. For this purpose, in addition to the control mixture containing no mineral admixture, three more series of mixtures were prepared. In the first and second mixtures 30% and 10 w.t% of cement was replaced with silica fume and fly ash respectively. In the third series, cement was replaced with both of silica fume and fly ash by 30% and 10%, respectively. According to test results, fresh state properties of paste mixtures were affected by mineral admixture use positively in general. However, a reverse result was observed for the fresh state properties of mortar mixtures. Compressive strength values of the mixtures including fly ash as well as the ones including silica fume and fly ash was found to be less than that of control mixture. Nevertheless, the difference between those values reduced at the end of 90 days. Mixture including silica fume showed the highest strength value from the beginning. 90-day water absorption values of the mortar mixtures were observed to be less compared to that of control mixtures with the use of mineral admixture. The mixture having ternary binder system (including cement, silica fume and fly ash) showed better performance in terms of hardened properties. The water absorption capacity value of mentioned mixture was observed as 42% less than that of control mixture.