Abstract: This study investigates the use of rice husk ash (RHA) in 0%, 5%, 10%, and 20% bulk replacements of Portland cement in concrete, with optimization of ash by incineration. Compressive strength tests were performed with cement substituted with rice husk ash (RHA) in four grades (0, 5, 10 and 20)% and fine aggregate substituted with laterite in three grades (0, 10 and 20)% and cured was performed at 7, 14 and 28 days of age. Concrete with a mixture of 1:2:4 (cement:fine aggregate:coarse aggregate) was used throughout the experiment with a water-cement ratio of 0.65; the fine aggregate being a mixture of lateritic soil. The proportion of lateritic soil was varied between 0%, 10%........
Key words: RHA, laterised concrete compressive strength, concrete, micro-structure
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