A STUDY ON BEHAVIOUR OF RECYCLED COARSE AGGREGATE IN TERNARY BLENDED CONCRETE WITH SILICA FUME & FLY ASH

Abstract

Utilization of industrial wastes and construction wastes in concrete production resolves the major problems in waste disposal and thereby reducing the environmental impacts. There are number of industrial and construction wastes like steel slag, copper slag, fly ash, imperial smelting furnace slag, blast furnace slag, foundry sand, coal bottom ash, Ferro chrome slag, silica fume, palm oil clinker, broken bricks and crushed concrete etc. Out of these materials recycled aggregate, fly ash and silica fume were used in this study. In this project the strength characteristics of two groups having 50 % and 100 % recycled aggregates as a replacement of coarse aggregates were studied for ternary blend concrete mix. In both mix group’s fine aggregate was also partially replaced with Foundry
sand. The ternary blend was developed by partial replacement of cement with two mineral admixtures Fly ash and silica fume. The cement has been replaced by fly ash consequently in the range of 0%, 10%, 20% and 30% by weight of cement and 2.5% of silica fume in common for M-30 mix. Concrete mixtures were produced, tested and compared in terms of compressive and split tensile strength with the conventional concrete for standard ages.