THE EFFECTS OF COCONUT FIBRE ON THE COMPRESSIVE AND FLEXURAL STRENGTH OF CONCRETE
Abstract
The influence of coconut fibre on the mechanical properties of concrete was evaluated in this study. Four types of mix proportions were adopted in this research. Mix 1 had 0% of coconut fibre (control), Mix 2 contained 0.25% of coconut fibre, Mix 3 contained 0.5% of coconut fibre and Mix 4 contained 1% of coconut fibre. A fixed mix design ratio of 1:2:4 with a constant water-cement ratio of 0.5 was used. All the constituents of concrete were taken by the mass of the concrete cube or beam specimen while the varying percentage of the coconut fibres were taken by the mass of the cement. A total of 32 cube specimens of 150mm x 150mm x 150mm were used to determine the compressive strength of the concrete. The flexural strength of the concrete was determined using 32 concrete beam specimens of 100mm x 100mm x 600mm. All the specimens were cured and tested accordingly for 7 days, 14 days, 21days and 28 days. The results obtained show that Mix 2 (0.25% coconut fibre) had the optimum compressive and flexural strength of 33.85 MPa and 5.75 MPa respectively at the 28th day of curing. However, Mix 4 (1% coconut fibre) had the lowest compressive and flexural strength of 24.35 MPa and 4.38 MPa respectively on the 28th day of curing. From the results obtained, it was concluded that the incorporation of coconut fibre in concrete up to a certain quantity, can improve the mechanical properties of the concrete.
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KEYWORDS: Coconut fibre, reinforced concrete, Compressive strength, Flexural strength, Sustainable construction
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