Study on effect of natural and ground Rice-Husk Ash concrete

One percent of the earth's surface is used for cultivation of rice and it is the staple food for billions of people. In India, rice production is 21.2% of World's production and ranked second among the top twenty rice producing countries. The Rice-Husk Ash (RHA) is a waste residue from incinerating rice-husk. A high reactive pozzolan is obtained when RHA is burnt under controlled conditions. In this paper, the residual RHA was used as a substitute for cement firstly as Natual RHA (NRHA- without grinding) and secondly as Ground RHA (GRHA). The optimum percentage of replacement of RHA was obtained as 10% by weight of cement for natural RHA replaced concrete and 15% for Ground RHA replaced concrete and corresponding improvement in strength as 4.3% and 11.4% respectively as compared to control concrete. Chloride penetration resistance characteristics of natural and ground RHA concretes are 19% and 52% respectively as compared to control concrete.