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Self-Compacting Concrete: Strength Evaluation of Corn Cob Ash in a Blended Portland Cement

Kayode Oluborode, Ilesanmi Olofintuyi

Abstract


The paper investigates the prospects of corn-cob ash (CCA) as effective constituent in self-compacting concrete. The structural value of the composite was evaluated with consideration for its suitability as self-compacting concrete. Varied percentage of corn-cob ash at 0%, 10%, 20%, and 30% replaced cement in a mix of 1:2:4 concrete with variable plasticizer admixture of COMPLASTSP430 at 0%, 1%, 2% and 3% replacement. Specified tests for Self-compacting concrete (SCC), related to workability such as flowability, filling-ability, and passing-ability tests were carried out on fresh samples. Compressive strength of hardened cured (150 x 150 x 150) mm concrete cubes at 7days and 28 days were tested. The results showed that at 2% SP430 and 30% CCA replacement, the compressive strength was 20.37N/mm2, while the flowability, filling ability, passing ability, and segregation potential were 755mm, 29mm, 6 sec and 6.2mm respectively. On analysis and comparison of the results with known SCC standard, a percentage replacement of 2%SP430 and 30%CCA meet the requirement of self-compacting concrete.


Keywords


Corn-Cob Ash; Compressive strength; Plasticizer; Self-compacting concrete; Segregation potential.

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References


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