Feasibility of Construction Demolition waste in Concrete as a Coarse Aggregate

Abstract

Concrete is an efficient and versatile material for construction. The rapid urbanization results in huge increase in new construction activities which ends with exploitation of natural resources, whereas demolition of structure ends up in the generation of Construction & Demolition wastes (CDW) in a huge amount that causes solid waste disposal issues. This research reveals utilization of CDW effectively in Concrete, to attain the property of natural aggregates as well as to reduce the solid waste disposal issues. Initially, the debris from the building waste is collected, crushed, and separated as C-Coarse and C-Sand. The M40 concrete specimens is done by using the cultivated aggregates in 25, 50, 75 and 100 % replacement with that of the natural aggregates. From the test result the 50% replacement of cultivated aggregate is optimum and M3 mix is a suitable mix. The effective depth of beam is also almost similar with M3 mix makes the use of CDW as a feasible one. Use of CDW will save about 12.075 m3 of fine aggregate and 21.625 m3 of coarse aggregate for every 100 m3 of concreting work makes it as a suitable alternative for the conventional aggregates. Thus, the 50% replacement of CDW for aggregates is feasible in terms of strength characteristics of concrete that makes it as best material for natural aggregates and may decrease its requirement. Further, the rise in the use of CDW will reduce the volume of solid waste generated and corresponding environmental pollution which leads to achieving the sustainability of natural resources.