AN ASSESSMENT OF THE COMPRESSIVE STRENGTH OF CONCRETE MADE WITH CEMENT PARTIALLY REPLACED WITH CASSAVA PEEL ASH
This work determines the suitability of Cassava Peel Ash (CPA) as partial replacement of cement in concrete in a bid to devise more economical construction measures while preserving strength and protecting the environment. Tests to determine the chemical composition of the CPA, specific gravity and sieve analysis of the aggregates in accordance with BS 812 standards and slump test of the concrete were carried out. In the experiments, 0-50% with 5% increment of CPA was used as partial replacement of cement in concrete. The concrete was batched by weight with a ratio of 1:2:4. Compressive strength test was conducted on the samples at interval of 7 days and some of the results obtained in N/mm2 were 10.50, 16.00, 16.50, 19.50 for 0 %, 9.50,15.50, 15.60, 18.00 for 5 %, 6.80, 13.40, 14.10, 15.00 for 30 %, 5.90, 12.00, 13.50, 14.20 for 40 %, 5.50, 11.70, 12.9,13.70 for 45 %, 5.30, 11.20, 12.00, 13.10 for 50 % partial replacement conducted for 7, 14, 21 and 28 days curing respectively. The graph plotted showed that compressive strength of the concrete increased with increase in length of curing, but decreased as the percentage of cassava peel ash was increased. However, the strength still remained in the allowable range of workability for concrete in line with the British standard. Also, it was found out that the entire mix was suitable since the results were within the acceptable limits as concrete strength made with varying amounts of cassava peel ash did not fall below half of the original strength of the concrete made with zero percent CPA. This alternative use of cassava peelings will in the long run reduce cost of construction, attract higher economic value to cassava peels and increase the economic return of the farmers and preserve the environment.