RELATION AMONG MECHANICAL PROPERTIES OF GROUND GRANULATED BLAST FURNACE SLAG CONCRETE

Ground granulated blast furnace slag (GGBS) is a well known pozzolanic material. In the present work, an attempt has been made to study the effect of GGBS inclusion on the fresh and hardened concrete properties (workability, compressive strength, flexural strength and split tensile strength), and to develop relationship among the different strength parameters. Eight concrete mixes containing 0, 10, 20, 30, 40, 45, 50 & 55% GGBS (weight basis) as cement (OPC) replacement were prepared to find the optimum replacement level of GGBS. M35 grade concrete with cement content of 460 kg/m3 was used as a referral concrete. Test specimens were cured in tap water for 7, 28, 56, 90 days after the demoulding for compressive strength, while, the specimen for flexural and split tensile strengths were cured for 28 days only. This study shows that the workability increases with increase in the replacement level. The compressive strength, flexural strength and split tensile strength of concrete mixes increase with GGBS content till an optimum replacement level of 40%. Further addition, beyond this level shows a decrease in strength but still the strengths are generally more than the referral.