Experimental Investigation of Effect of Partial Replacement of Cement with Fly ash on the Workability and Mechanical Properties of Concrete

Experimental Investigation of Effect of Partial Replacement of Cement with Fly ash on the Workability and Mechanical Properties of Concrete
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© 2023 by IJETT Journal
Volume-71 Issue-9
Year of Publication : 2023
Author : N Z Nkomo, A A Alugongo
DOI : 10.14445/22315381/IJETT-V71I9P211

How to Cite?

N Z Nkomo, A A Alugongo, "Experimental Investigation of Effect of Partial Replacement of Cement with Fly ash on the Workability and Mechanical Properties of Concrete," International Journal of Engineering Trends and Technology, vol. 71, no. 9, pp. 116-128, 2023. Crossref, https://doi.org/10.14445/22315381/IJETT-V71I9P211

Abstract
Cement production contributes approximately 5% of the world's annual Carbon dioxide production. This high percentage can be attributed to the huge quantity of cement used worldwide. However, the process of production of cement is not environmentally friendly. Using fly ash as a partial cement substitute is a possible way to minimize pollution from cement production. Fly ash is produced as a by-product of burning coal in thermal power stations. The fly ash is mainly disposed of in landfills, contributing to environmental pollution, with only 20-40% of fly ash being used productively. This study investigates the effect of cement replacement with fly ash on concrete's workability and mechanical properties. The slump value increased with the incremental percentages of fly ash. The flexural strength increased with fly ash content, with the highest strength at 15 %. The maximum compressive strength was observed at 15% fly ash content. The highest split tensile strength was observed at 20% fly ash content with a strength of 2.35 N/mm2. The addition of fly ash into the concrete mixture ultimately had the effect of lowering the cost.

Keywords
Concrete, Fly ash, Mechanical properties, Workability.

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