STRENGTH PROPERTIES OF CONCRETE WITH PARTIAL REPLACEMENT OF CEMENT WITH METAKAOLIN,SILICA FUME AND ALSO PARTIAL REPLACEMENT OF FINE AGGREGATEWITH STEELSLAG

Abstract

In present day to day life the infrastructure development of structure has been increasing, In construction one of main material is natural fine aggregates, has lead to a decrease of available natural resources, on the other hand a high volume of steel slag production has generated a considerable amount of waste material. Steel slag[2] is generated in a 1600o C (3000o F) furnace, organic, semi-volatile, or volatile compounds are not present in steel slag. Chemically steel slag consists primarily of oxides of calcium, iron, silicon, aluminum, magnesium and manganese in complexes of calcium silicates, aluminosilicates and aluminoferrite (primarily with BOF and EAF slag). These compounds are generally similar to those found in the natural environment.

In this present work the properties of concrete with partial replacement of fine aggregates by steel slag fine form using steel slag waste as a substitute rather than natural fine aggregates along with metakaolin[4], silicafume[3]substitute of cement were studied for M30 grade concrete. The properties of the various ingredients of the concrete and steel slag aggregates were experimentally determined and mix design has been prepared for concrete for various proportions of steel slag aggregates in fine form.

Fresh concrete properties such as workability, air content and density were determined for all the replacement proportions. Mechanical properties such as compressive strength, tensile strength and flexural strength for various replacement proportions of fine aggregates with steel slag fine aggregates were found out and from that optimum replacement proportion was determined separately. The present investigation, 25% fine aggregate replacement by steel slag provide optimum strength.