Scope of reusing waste shredded tires in concrete and cementitious composite materials: A review

An estimate of over 1.5 billion waste tires are generated world over annually and the ongoing demand of tires is expected to appreciate by 4% reaching 3 billion units in year 2019. The black pollution created by this obstinately biodegradable waste poses a potential threat to environment. Scrap tires in landfills, scrap zones have direct effect on human health, contaminating soil and ground water due to the leaching effect of toxic metals present in tires. Concrete being the second most consumed material in the world, with 3 tons per year used for every person, partial incorporation of discarded tire into concrete, as aggregates, is an effective way of immobilizing waste, especially when 60-75% of concrete is made of aggregates. The main aim of this study is to assess the feasibility of utilizing shredded tire in concrete for structures and pavements through critical review of its rheological, static/dynamic mechanical, durability properties. Besides the study also envisages to explore different treatments, modifications and compositions for optimum utility of tire incorporated concrete/composites. The manuscript also intends to update the data base of shredded tire concrete/composites for further experimental and numerical investigation.