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Experimental Investigation on Concrete with Partial Replacement of Cement by Fly Ash

  1. Ushaa Eswaran
  2. J. Saibaba
  3. N. Narasimha

Abstract

Fly ash is increasingly used as a supplementary cementitious material to partially replace cement in concrete. This paper presents an experimental investigation on the strength properties of concrete with varying percentages of fly ash replacement, from 0% to 25% by weight. The fresh, hardened, and durability properties of high performance concrete with fly ash percentages of 5%, 10%, 15%, 20% and 25% were studied. The test results indicate that 20% fly ash replacement showed highest compressive, split tensile and flexural strengths compared to other replacement levels. Microstructural analysis also revealed refined pore structures and reduced calcium hydroxide content with fly ash incorporation. Cost analysis indicates that 15-20% fly ash replacement can provide significant cost savings compared to plain cement concrete for construction projects. The environmental benefits in the form of reduced landfill disposal and carbon footprint are also noteworthy. Thus, fly ash can be a viable sustainable material to manufacture durable and high strength concrete while benefiting environment and economy.

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