Performance Of Recycled Aggregate Concrete For M25 Grade

Abstract

Recycled aggregate are comprised of crushed, graded inorganic particles processed from the materials that have been used in the construction and demolition debris. One of the major challenges of our present society is the protection of environment. The use of aggregates from construction and demolition debris (wastes) is showing prospective application in construction as alternative to primary (natural) aggregates. Although there is a critical shortage of natural aggregate, the availability of demolished concrete for use as RECYCLED CONCRETE AGGREGATE (RCA) is increasing. Using the waste concrete as RCA can provide cost savings. The aim of this project is to determine the strength characteristics of recycledaggregates for application in high strength structural concrete, which will give a better understanding on the properties of concrete with recycled aggregates, as an alternative material to coarse aggregate in structural concrete. Further, this work is to determine and compare the workability, compression strength, indirect tensile strength, flexural strength and modulus of elasticityof recycled aggregate concrete with that of natural aggregate concrete.Toattain the planned objectives of the Present investigation, M25 grade concrete is taken and the replacement values via, 0%, 25%, 50%, 75%, 100% were considered. These five replacement ratios mix design are done by using    IS 10262-2009 method. A total of 60 cubes, 40 cylinders, 10 beams were casted to determine the properties mentioned as above.The development of compressive and tensile strengths of recycled aggregate concrete at the age of 7and 28 days; the development of flexural strength and static modulus of elasticity at the age of 28 days are investigated. The parameters which were investigated for recycled aggregate concrete and compared with natural aggregate concrete as per BIS specifications found to be decreasing gradually as the percentage of recycled aggregate are increased