India is in the process of modernization in the construction sector by repairing, renovation, up-gradation. Presently concrete, the universal building materials whose main ingredient is coarse aggregate.  The local natural resources like stone products and sand may exhaust and put the sector deficient of aggregates.  The wise use is to reuse recycled concrete and demolition wastes generated from the construction sectors due to shift from horizontal to vertical growth of urban areas. The replacement of recycled coarse aggregate shall efficiently organize the waste management, moderate the environment degradation, and upsurge sustainability. Use of recycling material in the construction industry as a recycled concrete is highly challenging. So our project deals about reusing of demolished concrete blocks from C &D wastes by form of Recycled coarse aggregate (RCA) are replacing the Natural coarse aggregate in concrete and use in the construction industry. The replacement of RCA in special concrete of 7 and 28 days of curing and the various physical and mechanical properties of materials and strength test of both concrete such as workability, compressive strength, split tensile strength and flexural strength. The test value are compared both in concrete. Our project investigates on recycling demolished waste materials in order to reduce construction cost and resolving housing problems faced by the low-income communities of the world. The crushed demolished concrete wastes is segregated by sieving to obtain required sizes of aggregate, several tests were conducted to determine the aggregate properties before recycling it into new concrete.