A Study on Optimization of Concrete Mix by use of Different Sizes of Coarse Aggregate and Evaluation of Mechanical Properties of Concrete

Concrete is a mixture of coarse aggregate, fine aggregate and slurry. Coarse aggregate occupies 70%-80% of total volume of concrete. Therefore coarse aggregate is major contributor for strength of the concrete. The size of coarse aggregate and its influence on strength properties of concrete is being studied in this present study. The coarse aggregate sizes used are 20 mm, 16 mm and 10 mm. In the present study, conventional concrete of M30 grade is compared with the concrete made out of partial replacement of coarse aggregate of size 20 mm with different sizes like 20m, 16mm&10mm in different proportions. After getting the trail mixes, tests on fresh concrete like workability, slump has been carried out. Later cubes, cylinders for each trail for 7, 14 & 28 days have been tested. Finally the mechanical properties like compressive strength, split tensile strength are obtained. Densities of such concrete cubes are compared with conventional concrete.