GLOBAL JOURNAL OFENGINEERINGSCIENCE ANDRESEARCHES EFFECT OF CALCIUM CARBONATE ON FLY ASH BASED BLENDED CEMENT CONCRETE

This paper presents the effect of calcium carbonate (CaCO3) on blended cement concrete (BCC). The BCC was prepared with CaCO3 concentrations of 0.025, 0.075, 0.1, 0.2, and 0.3 g/l by adding in deionised water. In addition to this, control specimen was prepared with deionised water (without CaCO3) for the purpose of comparison. The setting times and compressive strength were evaluated for 28 and 90 days apart from studying rapid chloride ion permeability. The results show that as CaCO3 concentration increases there is retarding in initial and final setting of blended cement (BC). The compressive strength of BCC increases as the concentration of CaCO3 goes up at both 28 and 90 days. There is no significant change in compressive strengths of BCC. It was also observed that chloride ion permeability has decreased with an increase in the concentration of the CaCO3. Keywords- CaCO3, Setting time, Compressive strength, Chloride ion permeability. I