EXPERIMENTAL INVESTIGATIONS ON USE OF C&D WASTE AS AN ALTERNATIVE TO NATURAL AGGREGATES IN CONCRETE

Abstract

Construction and Demolition (C&D) waste constitutes a major portion of total solid waste produced all across the globe, and most of this C&D waste is used in landfills. Research work in area of utilization of C&D waste indicates that after giving appropriate treatment, C&D waste can be utilized as a partial replacement of conventional aggregate in new concrete, especially in lower level applications. This paper briefly discusses present provisions in Indian and international codes for use of C&D waste as recycled aggregates (RA) and recycled concrete aggregates (RCA) in plain and reinforced concrete. In present study, C&D waste collected from a demolished building and C&D waste processing plant in New Delhi was processed and classified in different fractions (as fine and coarse aggregates). Aggregates were characterized for their different physical and chemical characteristics and results were found to comply with present IS: 383 specifications. Concrete mixes were prepared by replacing natural coarse and fine aggregates with different proportions (up to 100%) of Recycled aggregates from both the sources. All the concrete mixes were evaluated for different fresh (workability and air content), hardened (compressive strength, flexural strength and Modulus of elasticity) and durability parameters (RCPT, drying shrinkage and water permeability) at various ages.