A study was conducted to determine the suitability of laterite soil as fine aggregate in M25 concrete. Firstly water absorption of laterite soil is conducted. For concrete mix, the replacement of the fine aggregate by laterite soil is in the range of 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%and 40% respectively. The test was conducted as per Indian standards specification.
Addition of laterite to any particular concrete mix is found to reduce its strength characteristics. This is due to fineness of laterite which ultimately increase the air voids as fine particle is at the bottom side and air voids at the top level do not fill properly. But the addition of super plasticizer helps to increase the strength values up to 15% laterite content and further mixing reduce the same. Laterite content of 15% by weight of sand content has shown the best results. Thus it is indicating the possibility of using laterite as a partial replacement for sand up to this level.