Effect of waste burnt bricks as coarse aggregate on the compressive strength of light weight revibrated concrete

Abstract

The paper presents an experimental study on the compressive strength of re-vibrated concrete cubes using waste burnt bricks as coarse aggregate. Using 1:2:4 as concrete mix ratio and 0.6 water-cement ratio to cast 48 cubes specimens and cured for 7 and 28 days; 24 cubes for control (granite as coarse aggregate); and another 24 cubes for waste burnt bricks as coarse aggregate. Each of these categories were re-vibrated at an interval of 10 minutes each, for 60 minutes after the initial vibration. The compressive strength of the cured concrete cubes specimen were determined. The results obtained showed a maximum strength of 24.96N/mm2 at 60th minutes re-vibration for 28 days curing and a maximum strength of 18.64N/mm2 at 60th minutes re-vibration for 28 days curing for the control (granite as coarse aggregate) and waste burnt bricks (WBB) as coarse aggregates respectively. It was concluded that crushed waste burnt bricks can be used to replace granite in the production of lightweight re-vibrated concrete.