NEAR ZERO WASTE USING RECYCLED OF CRUSHED CONCRETE AGGREGATE IN ASPHALT MIXTURES

Abstract

In asphalt mixtures aggregate generally represents the largest proportion of asphalt concrete mixture. It accounts for 92 to 96 percent of asphalt concrete mixtures by weight or approximately 75 to 85% by volume. Using these large quantities of aggregates in asphalt mixtures affect the natural resources. So recycling of crushed concrete could be a solution to this problem. The use of recycled crushed concrete in asphalt mixtures can prevent the accumulation of waste material and primary production costs as well as environmental pollution. In this research the basic properties of natural aggregate and recycled aggregate were evaluated. In asphalt concrete mixtures natural aggregate replaced with recycled aggregate in deferent percentage namely 10%, 20%, 30%, 40% and 50%. The mechanical characteristics of the mixtures were evaluated by Marshall Stiffness and indirect tensile strength to choose the optimum recycled aggregate replacement ratio. The results indicated that using recycled aggregate in asphalt concrete mixtures have good impact in environment protection and economics. Up to 20% of recycled of crushed concrete aggregate can be used in asphalt concrete mixtures. The mixtures with recycled of crushed concrete aggregate have low stiffens and stability so it should be used at low traffic area.