High Strength Green (HSG) Concrete with Coal Fly Ash

Abstract

The use of fly ash in concrete can lessen the burden of its dumping in landfills to protect the environment and soil degradation. We investigated the concrete mixtures incorporating various percentages of fly ash and studied the mechanical properties of high strength green (HSG) concrete. 0.32 w/c ratio was used. Six mixtures were investigated with varying percentages of fly ash (0%, 4%, 8%, 12%, 16%, 20%) with HRWR (high range water reducer) ranges (0%, 0.4%, 0.7%, 1.0%, 1.3%, 1.6%). The compressive strength of the mixture with a dosage of fly ash from 4 -12%, showed satisfactory results. The peak value of split tensile strength was 4.9 MPa with 12% fly ash dosage. Flexural strength in control mixture was observed at 3.73 MPa in 28 days and there was a slight increase in the trend of flexural strength. The compressive strength was achieved till 12% volume of fly ash for 14 and 28 days. It was due to more adherence between the fly ash and aggregate. Fly ash is very suitable to be used in concrete to produce high strength green (HSG) concrete. If we use fly ash in concrete, it can help us cleaning the environment from contaminating materials.