An experimental investigation was carried out to study the behavior of concrete by replacing the fine aggregate with locally available red soil. It involves a certain tests to find the quality improvement of concrete when red soil is added to it. The partial replacement of sand with red soil was done according to the specific mix proportion to gain good strength in concrete. Mechanical properties such as compressive strength and split tensile strength were carried out for red soil mixed concrete and plain concrete to differentiate the strength in it. The chemical properties of red soil and sand have been examined in the BCSIR laboratory and it was found that the properties are almost similar, which indicated that sand can be replaced by red soil. Here, sand was replaced partially by 5%, 10% and 15% red soil. For 5% red soil, the compressive strength and split tensile strength were decreased by 10.44% and 8.78% respectively in 28 days of curing, compared to plain concrete specimen. For 10% red soil, the strengths were decreased in 7 days by 9.9% and 4.16% respectively, but showed almost similar result in 14 and 28 days. Again, for 15% red soil, the strengths were decreased in 28 days by 13.82% and 17.57% respectively. Overall, the compressive strength and split tensile strength were found satisfactory compared to plain concrete specimen for 10% red soil.
Authors: Rahman S, Farnaz T, Islam T.