INFLUENCE OF MINERAL ADMIXTURES ON THE MECHANICAL PERFORMANCE OF STEEL FIBER REINFORCED CONCRETE

Abstract

Concrete is mainly containing natural sand and gravel or crushed- rock aggregate and water, when placed in the skeleton of form and allowed to cure, becomes hard like stone. Generally weighing about 2400kg/m3 is called “normal-weight concrete” and it is the most commonly used concrete for structural purposes. High strength concrete is concrete with a compressive strength higher than 40mpa. it is made by lowering the water-cement (W/C) ratio 0.40 or lesser . it had widely used in large and long life constructions that demands early age strength, high density, heat of hydration, high flow ability, and high durability. It is very difficult to get products which additionally fulfill all of the properties. So the different mineral admixtures like Ground Granulated Blast furnace Slag (GGBS), silica fume, Rice husk ash, Fly ash, High Reactive Met kaolin, are some of the admixtures which can be used in concrete as partial substitutement of cement, which are very important ingredients to make high strength concrete. Our aim it is to study the properties of concrete by partially replacing cement by fly ash and silica fume In this study, Cement was partially substituted by Fly Ash and silica fume. A mix design was done for M40 grade of concrete by using IS method. The utilization of fly-ash and silica fume in concrete as partial substitutement of cement. . Three grades of normal port land cement (OPC) namely: 33, 43 and 53 as classified by bureau of Indian Standard (BIS) or commonly used in construction industry. Now in this project only 53 grade of cement is used. This paper reports comparative study on effects of concrete properties by partially substitutement of OPC of 53 grade with fly ash and silica fume. We have to use the water falling admixture i.e. super plasticizer, which plays an important role for the production of high strength concrete. We have used steel fiber in different percentage i.e. 0.5%, 1%, 1.5% to that of total weight of concrete and casting was done. Lastly we used different percentages of silica fume with the substitutement of cement keeping constant fiber content and concrete was casted. We prepared concrete cubes and cylinders lastly compressive test, splitting test ,flexural test are conducted.