Durability characteristics of binary blend high strength SCC

SCC has emerged as an inevitable option in situations where there is scarcity of skilled labour at construction sites. In the present paper an attempt was made to produce SCC with three different supplementary cementitious materials as a partial substitute to cement in binary blend. Cement was replaced with ground granulated blast furnace slag (GGBFS) (25%, 50% & 75%), Metakaolin (MK) (10%, 20% & 30%) and Silica Fume (SF) (5%, 10% & 15%) respectively. Durability studies such as resistance against acid attack, sulphate attack, water absorption and sorptivity were done to evaluate the suitability of mineral admixtures. Experimental results of binary blend SCC were compared with concrete (NVC) to understand the effect of mineral admixtures. The results indicated low water absorption and lesser volume of permeable voids in MK based SCC compared to NVC. GGBFS based SCC (with 50% Substitution) exhibited better resistance against acid attack than NVC. No significant difference in weight loss was observed for concrete immersed in Na2So4 solution. SF with 10% substitution and MK with 20% substitution gave good results compared to control SCC. Hence it is concluded that SCC could be produced with supplementary cementitious materials without compromising on durability.