RHA AS A LIMITED ALTERNATE OF CEMENT FOR S-ACID ATTACK ON CONCRETE

Large scale exploitation of natural sand creates environmental impact on society. River sand is most commonly used fine aggregate in concrete but due to acute shortage in many areas, availability, cost & environmental impact are the major concern. To overcome from this crisis, partial replacement of sand with quarry sand can be an economic alternative. Quarry sand has been used in different construction purposes but replacement technology has emerged as an innovative development to civil engineering material. Design mix of M20 grade concrete with replacement of 0%, 15%, 30%, 45%,60% of quarry sand have been considered for laboratory test i.e slump test, compressive strength, split tensile strength, flexural strength, permeable voids and acid attack. (Cubes, cylinders, beams sample). The detailed study is on the effect of partial replacement of cement with Rice Husk Ash and Fly Ash on concrete. In this project different combination of Fly Ash and Rice Husk Ash as a partial replacement of cement and river sand by quarry sand is carried out. The composition of 7.5% Rice Husk Ash + 22.5% Fly Ash with 60% of quarry sand gives maximum strength results