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The study explores the strength of ordinary Portland cement (OPC) concrete when blended with rice husk ash (RHA). The research uses laboratory experimentation, specimen preparation, curing regimes, and mechanical testing to evaluate the effects of RHA on concrete's mechanical properties. Results show that RHA influences the strength development of OPC concrete, with variations in early-age and long-term strengths. The study uses rice husk ashes, which have a bulk density of 770kg/m3, specific gravity of 1.85, and fineness modulus of 1.45. The research also focuses on determining compressive strength, and workability of the Portland cement in concrete.Three concrete mixes were designed using specific characteristic concrete strength of 30N/mm2, standard deviation of 6N/mm2 and slump ranges of 30-60mm. A constant water/cement ratio of 0.57 was used throughout the mix and the batching was by weight. Mix 1 was cast with cement only 100% OPC which serves as the control mix, then sample another two mix was casted with some percentage replacement of 30% and 40% of cement with RHA respectively. Based on the findings the following compressive strength was determined for the three-mix design 30.51, 23.88 and 19.19 N/mm2 respectively. In addition, the durability test was conducted after 56 days and the following strength was gotten 33.30, 28.99 and 22.10N/mm2 respectively. Keywords: characteristics strength, Portland cement, Rice husk, Concrete.
Ikwueze et al. (Fri,) studied this question.