Concrete Subjected to spiral steel Fibre

Abstract

Concrete is quite popular material in today’s era. It has a history of evolution at different stages. In modern time we can see concrete made structures all around rather it is Residential Buildings, flyovers, industrial building, water carrying structures like elevated water tanks etc. It is strong under compression yet weak under tension. To counter the weakness in tension we have to add something which can bear tensile force subjected to concrete ex: steel bars and to resist cracks we have to add fibres which gave some additional benefits along with increasing cracking strength it also improve tensile, flexural, shear, torsional strength and also improves its durability etc. Present study is to ascertain the behavior of steel fibre reinforced concrete with varying percentage of fibres. The experiments were conducted on concrete mixes of M20 grades. Spring fibres of length 25mm and diameter of 0.1mm (cross-section) and spring diameter 8mm with aspect ratio of 31.25 was used. Concrete was reinforced with different percentage of above mentioned fibres i.e. 0%, 0.5%, 1%, 1.5% and 2% by weight of cement. A total of 15 cubes of standard size 150mm*150mm*150mm, 15 cylinders of 150mm diameter and 300mm height were cast and 15 beams of 100mm*100mm*500mm were cast and tested under two point loading to find flexural strength. The experimental program involved the evaluation of the compressive strength of concrete cubes under uniaxial compression. The cylinders were tested for their splitting tensile strength and the tensile strength was recorded under uniaxial compression testing machine. Flexural test on plain concrete and SFRC-Standard beam of size 100mm*100mm*500mm Were supported symmetrically over a span of 420 mm and subjected to two points loading till failure of the specimen.