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An Experimental Study on Concrete by Replacement of Coarse Aggregate with Demolished Building Waste in Crushed Concrete

Ajit Joon, Jagdeep Hooda, Md. Anzar Rabbani

Abstract


A large amount of construction and demolition wastes are produced annually in India. These waste materials require a large place to dispose and then the disposal of wastes has become a severe problem. The continuous use of natural resources for making conventional concrete leads to the reduction in their availability and results in the increase of the cost of the coarse aggregate and fine aggregate. The possible use of recycling demolition waste as coarse aggregate in the construction industry is thus increasing its importance. When the recycled coarse aggregate is applied in structural concrete, the assessment of mechanical, physical and durable characteristics of recycled coarse aggregate is very significant. Huge amount of construction wastes is continuing being produced which are just being deserted in the landfills. This practice needs large areas of land which is becoming tough to find. The best solution of this problem would be to recycle and reuse the demolished waste which would not only help in conserving the environment but also help in dealing with construction wastes. Due to the critical shortage of natural aggregate, the availability of demolished concrete for use as recycled concrete aggregate (RCA) is increasing. RCA has very high compressive strength as compared to the natural coarse aggregate concrete. This is mainly due to high amount of attached mortar on the surface of the recycled coarse aggregate and highly angular nature of RCA leads to poor quality of coarse aggregate. The utilization of the waste concrete as RCA preserves natural aggregate declines the impact on landfills, losses energy consumption and can deliver cost savings. The current study reutilize waste crushed concrete maters (WCC) from the lath wastage of crushed concrete replacing from coarse aggregate 20%, 30%, 40% (WCC), 3% of crushed coarse aggregate (lathe waste) to reduce the generation of demolition wastes.
This Research Paper reports the basic properties of recycled coarse aggregate. It also equates these properties with natural aggregates. Basic concrete properties like compressive strength, workability etc. are clarified here for different combinations of recycled course aggregate with natural aggregate. In general, the present status & application of recycled coarse aggregate in India with their future need is debated.

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