Evaluation of Mechanical Properties of High Strength (M40) Fibre Reinforced Concrete using Admixtures

Abstract

This research concentrates on the evaluation of mechanical properties of high strength concrete using fibers and admixtures. Now-a-days High strength concrete is used in the construction to get the more strength and durability. High strength concrete mix of M40 grade is designed by adding fibers and admixtures. Admixtures like Super plasticizer & master glenim are used to replace the cement content in the mix. Chemical admixtures are used to decrease the water content in the concrete such that its workability and compressive strength increased. Along with that as the concrete is weak in tension, to overcome that, fibers of polypropylene were used. Fibers can increase the tensile behaviour of the concrete beam. The specimens were prepared by adding the fibers and mineral admixtures to the high strength (M40) concrete and conventional concrete and tested for compressive strength, Slump cone test, Modulus of elasticity and flexural strength at 7,14, 28 & 56 days. Based on the experimental values, it is clearly identified that all the results were obtained target mean strength. Experimental data shows that using fiber content from 0.5% to 1% can increase all mechanical properties of the concrete but using more than above mentioned content will leads to decrement of strength parameters of the concrete.