Recycling of Demolished Concrete and Mortar in Manufacturing of Aggregate

Kolhapur is presently generating construction and demolition waste to the tune of aprox.900 tons annually and these figures are likely to double fold in the next 2 years. Concrete has been seen as a resource in developed countries. Works on recycling have emphasized that if old concrete has to be used in second generation concrete, the product should adhere to the required compressive strength. Literature survey reveals that compressive strength primarily depends upon adhered mortar, water absorption, Los Angeles abrasion, size of aggregates, strength of parent concrete, age of curing and ratio of replacement, interfacial transition zone, moisture state, impurities present and controlled environmental condition. Some of the studies have suggested the mix design procedure for recycled aggregates in concrete, yet a simple and Environment effective method of using demolished concrete, taking into account % adhered mortar and thus calculating mix composition needs to be developed. This project deals with the review of the existing literature work for the use of recycled concrete as aggregates in concrete in respect of mainly the compressive strength and proposes an approach for use of recycled concrete aggregate without compromising the strength.