EFFECT OF PARTIAL REPLACEMENT OF CEMENT WITH RICE HUSK ASH (RHA) ON CONCRETE PERFORMANCE CHARACTERISTICS
Abstract
Cement is an essential constituent in concrete mixture that reacts with moisture to form cement paste, the binder of aggregates in concrete, and the sustainability and consumption over time period makes determination of alternative cementitous material a necessity. This study investigates the effects of partially replacing cement with rice husk ash (RHA) on concrete performance characteristics to reduce reliance on conventional cement as primary binding agent. Cement was replaced with RHA at 5%, 10%, 15%, and 20% by weight, while a 0% RHA mix served as the control. Tests on workability, compressive strength, and flexural strength were conducted to evaluate the performance of concrete containing varying RHA proportions. A mix ratio of 1:1.5:3 and a water-cement ratio of 0.5 were adopted, with samples subjected to both air and water curing at intervals of 3, 7, 14, 21, 28, and 42 days for compressive and split tensile strength assessments. The results showed that the inclusion of RHA enhanced compressive strength, with optimal performance observed at 15% replacement. However, split tensile strength decreased compared to the control mix. Regression model, ? = a + b*(RHA) + t^c) revealed further that RHA addition improves concrete workability and compressive strength up to a 15% replacement level. While RHA-enhanced concrete demonstrates favourable strength characteristics under compression, the reduced tensile strength suggests the low tensile strength behavior of concrete which commonly is associated with low bond strength during formation
Keywords: Cementitous, Concrete, Compressive-strength, Flexural-strength, Regression model,
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