STUDIES OF NITRIC ACID ATTACK ON RICE HUSK ASH CONCRETE

The main objective of this paper is to study the influence of partial cement replacement with rice husk ash in concrete subjected to different curing environments. Experimental investigation was carried out to assess the acid resistance of concrete in HNO3 solution. The variable factors considered in this study were concrete grade of M40 and curing periods of 7days, 28 days, 60 days, 90days, and 180 days of the concrete specimens. The parameter investigated was the time in days to cause strength deterioration factor of fully immersed concrete specimens in 2%, 3%, 5% HNO3 solution. Rice husk ash has been chemically and physically characterized and partially replaced in the ratio of 0%, 5%, 10%, 15% and 20%. Fresh concrete tests like compaction factor test and hardened concrete tests like compressive strength at the age of 7days, 28 days, 90, 180 days was obtained.