Effect of sieved coal bottom ash as partially replacement in properties of concrete

Civil Engineering

This paper presents the results on an experimental investigation of the effects of sieved coal bottom ash as a replacement for natural sand on the properties of concrete. The test results of compressive strength, split tensile strength, flexural strength, and water permeability are studied. The natural sand was replaced with sieved coal bottom ash by 0%, 20%, 30%, 35%, 40%, 60%, 80%, 100% by weight, at fixed water- cement ratio. The results indicate that there is a decrease in the density of sieved coal bottom ash concrete with the decrease of workability with increase in sieved coal bottom ash percentage. The results shows that the comprehensive strength, split tensile strength and flexural strength decreased as the percentage of replacement of sieved coal bottom ash increased as compared to controlled concrete. In this work w/c ratio and slump was kept constant as 0.43 and 100 ± 10 mm respectively. It was observed that up to 35 % replacement the results of comprehensive, extramural, split tensile strength and water permeability are greater than controlled concrete.

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