EVALUATION OF THE COMPRESSIVE STRENGTH OF COCONUT FIBRE-CEMENT-AGGREGATES BLENDED CONCRETE USING MULTIPLE REGRESSION APPROACH

O.U. Orie, Winifred A. Nwibe

Abstract


The work investigated the effect of treated coir fibre on the mechanical properties of concrete. A recommended mix ratio of 1:2:4 with coir fibre of length 4cm at different percentages (0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, and 15%) of coir fibre content by weight of cement were used as part of the mix composition for the concrete production at 0.6 water cement ratio. The cubes measuring 150mm x 150mm x 150mm in dimension corresponding to BS EN 12390-1[1] were cured for 7, 14, and 28 days after which a compressive strength test was carried out on the samples. Multiple regression was used to predict the compressive strength values and the practical values of compressive strength were gotten from the laboratory work.  The results of the water absorption test carried out on treated and untreated coir fibre showed that treated coir fibre absorb less water than untreated coir fibre and this water could be used for the complete hydration of cement. The workability of the coir fibre reinforced concrete decreases with increase in the percentage of fibre content. The practical optimum compressive strength occurred at 2% fibre content of values 23.23N/mm2, 25.60N/mm2, and 26.12N/mm2 at 7, 14, and 28 days curing respectively. Multiple regression analysis was used to predict the compressive strength and the optimum occurred at 4%, 0%, and 4% fibre content of values 22.17N/mm2, 23.31N/mm2, and 25.43N/mm2 at 7, 14, and 28 days curing respectively. Statistical checks were done on the model using least square method, ANOVA and T-test.

KEYWORDS: Compressive strength, Water absorption, Coir fibre, Workability, and Regression

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References


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