Use of Recycled Aggregate in Concrete

In this rapid industrialized world, recycling construction material plays an important role to preserve the natural resources. In this research, Recycled Coarse Aggregates (RCA) from demolished slab pieces were used. These demolished slab pieces are crushed to suitable size and reused as recycled coarse aggregate. Natural sand used as fine aggregate. Concrete industry, uses 12.6 billion tons of raw materials each year, is the largest user of natural resources in the world. The environmental impact of production of raw ingredients of concrete (such as cement and coarse and fine aggregates) is considerable. The scale of the problem makes it prudent to investigate other sources of raw materials order to reduce the consumption of energy and available natural resources. In this paper an experimental program was undertaken which contains i) a brief analysis of properties of recycled coarse aggregates, and judged its effectiveness in use of concrete. Concrete mixes were designed with 28 day compressive strength as 20 MPa. The concrete mixes were designed using IS102621982 i) conventionally used coarse aggregates and ii) 10 %, 20 %, 30 %, 40 %, 60 %, 75 %, 100 % replacement of recycled coarse aggregate and. With reference to the experimental results, analysis of important properties of both the types of concrete is done and the suitability of use of recycled coarse aggregate for new concrete is judged. iii) Split tensile strength is compared to controlled concrete and recycled concrete