Performance Evaluation of Concrete by using Sisal Fibre and Bamboo Fibre

Concrete is the most widely used materialthroughout the world. Concrete is a brittle material whichis good in compression but it is weak in tension, this leadsto the formation of cracks, these cracks extend and reachthe compression phase and finally the member breaks.Cracks are the major reason for the failure of thestructure. Many attempts have been made to improve thetensile strength of concrete. It becomes necessary to find abest method to improve the strength of concrete byreplacing cement with some natural material. So toincrease the tensile strength and compressive strength ofconcrete, technique of introduction of natural fibres inconcrete has been done. The fibres are distributedrandomly in a uniform manner. The post cracking responseof concrete can be nullified with the addition of naturalfibres into concrete. This is known as natural fibrereinforced concrete. Replacement of cement by 0, 0.5, 1,1.5, 2, 2.5 and 3% of natural fibres. The wet concrete mixwill be tested for workability and concrete specimens likeCubes, Cylinders and Beams will be cast to determine theCompressive strength, tensile strength and Flexuralstrength respectively. Addition of natural fibre were donefor M30 and M25 mix. The specimens were tested for 28days.The test results showed increment in the allproperties of concrete compared to conventional concrete.In M30 Grade concrete there was 18.17% increase incompressive strength compared to conventional concrete,highest value of compressive strength was obtained for1.5% and for 2% addition of natural fibres for M25 gradeconcrete has shown a increment by 10.6% compared toconventional concrete. In M30 grade concrete, the highesttensile strength was obtained for 1% addition of naturalfibres, compared to conventional concrete there was aincrement of 9.75% and in M25 grade concrete thestrength was highest for 1.5% addition of fibres, there was7.63% increment compared to conventional concrete. Thehighest value of flexural strength was obtained for 1% ofaddition of natural fibres to M30 grade concrete and theincrement was by 10% compared to conventional concrete.In M25 grade concrete the highest value was obtained for1% addition of fibres and the increment was by 7%compared to conventional concrete.