Mechanical And Durability Behaviour Of GGBS, M-sand Based Concrete With Varying Percentages Of Two Crystalline Admixtures – An Experimental Study

Abstract

This paper presents various investigations into the mechanical and long-term longevity parameters of concrete made with ground granulated blast slag (GGBS). In this experimental study, GGBS is used as a 30% substitute for cement, and two types of crystalline admixtures (CA’s) with different proportions of 0%, 0.5%, 0.75%, and 1% were added to the mix. Cubes and Cylinders were casted by mixing Mcrete and Master Pel 760 crystalline admixtures for two grades, M25 & M35 and left for curing period of 28 days. Test methods includecompressive strength, split tensile strength, Rapid Chloride Permeability test (RCPT), Sorptivity, Percentage of water absorption, Percentage of Voids and carbonation. The test results showed that both CA’s with GGBS at 0.75% produced better results and also significantly increased compressive strength by 12.08% for M25 grade and 16.04% for M35 grade, and tensile strength by 19% for M25 grade and 30.59% for M35 grade. Similarly, a decrease in percentages of 14.7 & 16.9 in RCPT, 8.52 & 11.19 in water absorption, and 11.34 & 10.01 in voids was observed in both M25 and M35 grades. Finally, Master Pel 760 has shown better performance than Mcrete Crystalline admixture. So, the above two CA’s has the potential to increase the durability and decrease the permeability of concrete buildings, particularly those exposed to corrosive conditions.