COMPRESSIVE STRENGTH OF RECYCLED AGGREGATE CONCRETE INCORPORATING SILICA FUME

Abstract

An experimental research has been conducted to utilize the behaviour of recycled aggregate concrete made with silica fume.30 concrete cubes of (6x 6x 6) size with 1:2:4 mix, and 0.55 water cement ratio were prepared in six (06) batches.Each batch consists of 05 samples.Six (06) batches were made with 0%, 5%, 10%, 15%, 20% and 25% replacement of cement with silica fume and 50% replacement of natural coarse aggregate with recycled coarse aggregate.Specimens were then cured for 28 days.Fineness modulus of aggregates, water absorption and specific gravity test of aggregates, slump test, and compressive strength test of cubes were conducted.15% replacement of cement with silica fume gives better result in compressive strength.Therefore, 15% replacement is concluded as a optimum dosage of the silica fume in green concrete.