EFFECT OF REVIBRATION ON THE COMPRESSIVE STRENGTH OF CONCRETE WITH RICE HUSK ASH AS PARTIAL REPLACEMENT FOR CEMENT

Abstract

The paper examines the effect of revibration on the compressive strength of concrete containing 20 % rice husk ash as a partial replacement for cement. Laboratory specimen cubes were subjected to successive revibration with 10 minute intervals for a period of 120 minutes. They were cured for 7, 14 and 28 days and tested respectively for their compressive strength. The result obtained shows that there is a gradual increase in compressive strength of the concrete specimen with increase in revibration time and it requires revibration during at least 90 minutes to achieve the compressive strength equivalent to or higher than that of normal concrete without cement replacement at 7, 14 and 28 days of curing respectively.