Experimental investigation of high temperature effect on Slag based alkali activated concrete and ordinary concrete

Effect of elevated temperature on residual mechanical properties of slag based alkali activated concrete (SAC) was compared with Ordinary Portland cement concrete (OPC) when subjected to temperature up to 900 ° C. SAC was prepared using sodium hydroxide and sodium silicate activators. Residual compres-sive strength, tensile strength, flexural strength, modulus of elasticity and bond strength was studied at differ-ent temperature ranges to evaluate effect of high temperature on both concrete. It was observed that compres-sive strength for OPC decreased from 32 MPa to 19 MPa while in SAC variation was decrease was found to be from 32 MPa to 25 MPa. Similarly in SAC variation in residual split tensile, residual flexural strength, re-sidual Modulus of Elasticity and residual bond test was much less compared to OPC concrete. Physical changes were much noticeable in case of OPC at high temperature compared to SAC. This indicates that SAC performed better at high temperature as compared to that OPC.