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Effect of Partial Replacement of Ordinary Portland Cement (OPC) with Ghanaian Rice Husk Ash (RHA) on the Compressive Strength of Concrete

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Document pages: 11 pages

Abstract: thisass for the mixes C20, C25, C30 and C35 wheretheir compressive strengths were verified at 3, 7, 14, 21, 28, 56, 90 and 180days. The X-ray diffraction pattern list indicated amorphous as well asdiffused peak of about 8000 counts of SiO2 representing crystallinestructures identified as cristobalite. A physical examination of the RHA showedvery fine appearance, grey color and specific gravity of 2.06. The chemicalanalysis also revealed the existence of oxide content to be 55.8 representing0.78 of Fe2O3, 54 of SiO2 and 1.06 of Al2O3 representing 20.23 lower than the minimum value of 70 required for pozzolans.Generally, the compressive strength values decreased as the RHA content in themixes increased but when compared to the control concrete the optimumreplacement percentage of Ordinary Portland Cement (OPC) with RHA at 5 showedan increase above the control concrete for C20 mix. The increase in the RHA inthe mixes resulted in the high demand for water in all the mixes.

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