MECHANICAL PROPERTIES OF STEEL FIBER REINFORCED REACTIVE POWDER CONCRETE USING FLY ASH

Abstract

Reactive Powder Concrete is a developing composite material that will allow the concrete industry to optimize material use, Generate economic benefits, and build structures that are strong, durable,and sensitive to environment. RPC is a new ultra-high performance concrete with wide range of capabilities. RPC was developed in the 1990s by Bouygues' laboratory in France. RPC represents a new class of Portland cement-based material with compressive strengths of 200 MPa range. By introducing fine steel fibers RPC can achieve flexural strength up to 50 MPa. It has no coarse aggregates and contains small steel fibres that provide additional strength.RPC include Portland cement, silica flour, fine sand, superplastizer, water and steel fibres. The main object of this study is to check the effect of replacing silica fume b fl ash and percentage variation of steel fiber on reactive powder concrete, to achieve economy without any significant change in properties of RPC. The silica fume is replaced by the fly ash by its weight variation of 0% to 50% with interval of 10 %.It was found that replacement of fly ash up to 40% by silica fume is economical to achieve high compressive strength upto 90 MPa under normal curing Percentage of fiber content vary from 0 % to 1 % with interval of 0.25%,It was found that addition of 0.75 percentage of fibres content gives  better flexural  and tensile strength.