Construction and demolition waste is the largest single source of solid waste in the world. The main industry and activity contributing to the problem is the construction industry. This accumulation of solid waste leads to many problems some of which are wastage of natural resources, availability of land required for landfills, and high cost of wastage. Therefore there has been a continuous attempt to find out a way to effectively deal with the waste. Since the construction and demolition waste when crushed and graded is very similar in characteristics to the coarse aggregates used to make concrete there is possibility to utilise the construction and demolition waste as an ingredient of concrete. This would reduce the costs of construction considerably while also solving the problem of disposal of waste. This project work assessed the effect of different proportions of using construction and demolition waste as a replacement for coarse aggregates in concrete. Concrete mix for M-30 grade concrete has been found as per design requirement of the IS code 10262-2009. In this project, size of cubes was selected, which is 150 x 150 x 150mm. Construction and demolition waste crushed and graded as course aggregates was used to replace 25, 30, 40 and 50% of coarse aggregates. The samples included 30 cubes that is 6 cubes for each respective proportion.