A REVIEW ON COMPRESSIVE AND TENSILE STRENGTH OF RECYCLE CONCRETE AGGREGATE

Abstract

Large quantity of concrete waste have been produced by construction & demolition industries in India and
many other developing countries & it is likely to increase in future. On other hand, In past year about 30 million
tonnes of concrete waste is produced out of which 60% is utilised in landfilling and remaining 40% remains as waste
only which causes lot of social, economical and environmental problem, Thus the idea of using recycle concrete
aggregate (RCA) in a production of new concrete is an effective alternative of reducing the concrete waste. It can lead
to the considerable saving in natural resources. It is obtained by crushing of demolished concrete and screening and
removing other contaminants. Recycle concrete aggregate is used in sub-base of roads, back-filling works and also
used in construction of Bungalows & low-rise building. The rate of recycle aggregate is about 550-600 Rs/ton which
is less than the rate of natural aggregate i.e. 750-850 Rs/ton. There is about 15-18% reduction in compressive
strength, about 20-24% increase in the water absorption capacity, about 30-32% reduction in the tensile strength
when natural aggregate is fully replaced by recycle aggregate in concrete at 28 days. The partial replacement of
natural aggregate with recycle aggregate is mostly in the ratio of 0%,25%,50% & 100% having an water-cement ratio
in the range of 0.50 - 0.65.This paper represents the research work done in the development of recycle concrete
aggregate(RCA). It’s mechanical behaviour, properties, effectiveness and it’s application.