A STUDY ON CONCRETE WITH PARTIAL REPLACEMENT OF FRESH AGGREGATE BY RECYCLED AGGREGATE

Abstract

Aggregate is one of the main ingredients in producing concrete. It covers 75% of the total for any concrete
mix. The strength of the concrete produced is dependent on the properties of aggregates used. Hence need for an
alternative coarse aggregate arises. The aim for this project was to determine the strength and durability
characteristics of high strength structural concrete by using recycled coarse aggregates, which will give a better
understanding on the properties of concrete with recycled aggregates. The scope of this project was to investigate the
possibility of using low cost recycled coarse aggregates as an alternative material to coarse aggregate in high strength
structural concrete. The experimental investigation were carried out using detailed strength and durability related
tests such as compressive strength test of cubes, flexural strength test of beams. The tests were conducted by replacing
the coarse aggregates in high strength concrete mixes by 0, 5, 20, 40, 60, 80 and 100% of recycled coarse aggregates.
In this paper we have use Recycled Aggregates (RA) use as an aggregate in the production of new concrete was
investigated. The performance of compressive strength produced by Recycled Aggregate Concrete (RAC) and results
are compared with the Natural Coarse Aggregate Concrete (NAC). The RA is collected from local demolished
structure. The studies were conducted with an M30 mix with the selected w/c ratio: 0.43 and the development of
compressive strength of the RAC and NAC at the age of 7 & 28 days were studied.