Concrete is the world's most important resource for infrastructure development. In the construction sector, it serves an essential role. We know that, with regard to compression, concrete is strong but weak in tension. The use of natural sisal fibre 1.5 by weight of cementitious materials is utilised in this research work, which is an easily available, renewable and economical one. Carbon dioxide (CO2) emissions into the environment occur during the cement manufacturing process. To overcome this problem, micro silica, a sub-product of an industry that acts as a cementitious material which replaces 0-15 of cement to provide good strength, and fly ash replaces 0-40 of cement, which is a pozzolanic material produced by combustion. In this paper, the experimental outcome is measured by tests such as a compressive resistance test for the cube, a split tensile force test for a cylinder and a flexural beam strength test. To assess resistance and chloride ion permeability of the concrete specimens, rapid penetrative chloride and accelerated corrosion tests were conducted. The analysis work is carried out using ANSYS software for RCC beam with sisal fibres hinged at both the ends and subjected to point load at the centre of beam.
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