IMPROVED COMPRESSIVE STRENGTH OF CONCRETE WITH SAW DUST ASH AS PARTIAL REPLACEMENT FOR CEMENT USING RE-VIBRATION

Abstract

The use of re-vibration is employed to improve the compressive strength of concrete with Saw Dust Ash (SDA) as partial replacement for cement in concrete production as presented. A mix ratio of 1:2:4 and water cement ratio of 0.6 was used to cast a total of 42 cubes specimen. Seven (7) concrete cubes were cast each for 0 % using 5 %, 10 %, 15 %, 20 % and 25 % replacements of cement with SDA respectively. The cubes were cured for 28 days and their compressive strength determine by crushing. Result obtained shows that the optimum SDA replacement was 10 % with a compressive strength of 21.67 N/mm2 at 28 days. It therefore means that SDA can partially replace cement up to 10 % and re-vibration can be utilize to improve the concrete strength once done within the setting time and plastic range of the fresh concrete.