The effect of temperature and sulphate attack on ternary blended self-compacting concrete

Abstract

In this paper, self-compacting concrete was prepared by modifying cement content of the conventional concrete mix. The substantial cementitious materials like fly ash, metakaolin and ground granulated blast furnace slag are used to partially replace the cement. The substitution amount of fly ash, metakaolin are 15%, 5% (fixed) and GGBS is used by 20%, 30% and 40% of cement to get three various SCC mixes. For both M25 and M40 grade concrete followed the same pattern and produced S25A, S25B, S25C, S40A, S40B and S40C. The mechanical properties of concrete like flexural and split tensile strength along with compressive strength at the age of 7, 14, and 28 days for all blends mixes. Specimens were immersed into 5% sodium Sulphate and 5% magnesium Sulphate solutions, and compressive strength was conducted on the specimens at 3, 7 and 28 days. Based on the mechanical properties and sulphate resistance of all the mixes S25C and S40C are selected for the temperature effect on mortar mix related to that concrete. The mortar specimens of S25C and S40C were tested for various elevated temperatures such as 250 °C, 450 °C to 650 °C for a period of 1 h. After that, the specimens were cooled in quenched and air-cooled condition.