Performance Evaluation of Concrete by using Sisal Fibre and Bamboo Fibre
Concrete is the most widely used material throughout the world. Concrete is a brittle material which is good in compression but it is weak in tension, this leads to the formation of cracks, these cracks extend and reach the compression phase and finally the member breaks. Cracks are the major reason for the failure of the structure. Many attempts have been made to improve the tensile strength of concrete. It becomes necessary to find a best method to improve the strength of concrete by replacing cement with some natural material. So to increase the tensile strength and compressive strength of concrete, technique of introduction of natural fibres in concrete has been done. The fibres are distributed randomly in a uniform manner. The post cracking response of concrete can be nullified with the addition of natural fibres into concrete. This is known as natural fibre reinforced concrete. Replacement of cement by 0, 0.5, 1, 1.5, 2, 2.5 and 3% of natural fibres. The wet concrete mix will be tested for workability and concrete specimens like Cubes, Cylinders and Beams will be cast to determine the Compressive strength, tensile strength and Flexural strength respectively. Addition of natural fibre were done for M30 and M25 mix. The specimens were tested for 28 days.
The test results showed increment in the all properties of concrete compared to conventional concrete. In M30 Grade concrete there was 18.17% increase in compressive strength compared to conventional concrete, highest value of compressive strength was obtained for 1.5% and for 2% addition of natural fibres for M25 grade concrete has shown a increment by 10.6% compared to conventional concrete. In M30 grade concrete, the highest tensile strength was obtained for 1% addition of natural fibres, compared to conventional concrete there was a increment of 9.75% and in M25 grade concrete the strength was highest for 1.5% addition of fibres, there was 7.63% increment compared to conventional concrete. The highest value of flexural strength was obtained for 1% of addition of natural fibres to M30 grade concrete and the increment was by 10% compared to conventional concrete. In M25 grade concrete the highest value was obtained for 1% addition of fibres and the increment was by 7% compared to conventional concrete.
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