Impact of Ricehusk Ash as Mineral Admixture In concrete

Abstract

This study investigates the mechanical behaviors of the concrete when rice husk ash (RHA) is
added as the mineral admixture. In the rice producing countries the wastes are commonly
dumped .it can be used as the bio mass as a supplementary material in concrete. This project
therefore presents the behavior of concrete made from Ordinary Portland Cement with Rice-
Husk Ash (RHA) made from a rice paddy replacement up to the age of 28 days. Six different
replacement percentages of cement by RHA, (i.e. 0%, 10%, 15%, 20%, 25% and 30%) were
used for the concrete specimens. The results are compared with those of concrete without
RHA (i.e. 0% RHA and 100% OPC).RHA thus proves to be an effective pozzolonic
cementitious material and provides optimum results at 15% replacement with cement. RHA
therefore provides a positive effect on the mechanical strength of concrete mix, up to 15 %
Rice Husk Ash replacement up to the age of about 28 days and reduction in utilization of
cement, and expenditures.