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Partial Replacement of Ordinary Portland Cement (OPC) with Bambara Groundnut Shell Ash (BGSA) in Concrete

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Author(s): B. A. ALABADAN | M. A. OLUTOYE | M. S. ABOLARIN | M. ZAKARIYA

Journal: Leonardo Electronic Journal of Practices and Technologies
ISSN 1583-1078

Volume: 4;
Issue: 6;
Start page: 43;
Date: 2005;
Original page

Keywords: Bambara Groundnut | Ash | Cement | Concrete

ABSTRACT
This paper examines Ordinary Portland Cement (OPC) and Bambara Groundnut Shell Ash (BGSA) concrete. The ash contained 10.91% CaO, 2.16% Fe2O3, 4.72% MgO, 33.36% SiO2, 1.75% Al2O3, 16.18% K2O, 9.30% Na2O, 6.40% SO3, 6.02% CO3 and 9.20% HCO3. 10%, 20%, 30%, 40% 50% and 0% ash was used in the mix to replace cement. The strength of cement/ash concrete increased with curing period but decreased with increasing ash percentage. The highest strength was 31.24N/mm2 and 20.68N/mm2 at 28 days for 0% and 10% ash respectively. Substitution of cement with ash in concrete formation was relatively possible not exceeding 10%.
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