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Mechanical properties, shrinkage, abrasion resistance and carbonation of concrete containing recycled coarse aggregate of different size range

The coarse aggregate component in concrete ranges from 35% to 55% of the total mass, therefore; the characteristics of coarse aggregate significantly influence properties of a concrete. The presence of different components in recycled coarse aggregate obtained from recycling of construction and demolition waste makes the aggregate properties dynamic in nature compared with a natural crushed aggregate. This paper discusses influence of replacement of natural aggregate of size range 4.75-20 mm by recycled concrete aggregate (RCA) on mechanical properties, drying shrinkage, abrasion resistance, and carbonation of concrete. The study on mechanical properties of concrete suggests that 50% replacement of natural aggregate in size range 10-20 mm by RCA has insignificant influence on compressive and flexural strength of concrete. However, the abrasion resistance, drying shrinkage, and carbonation durability of such concrete are inferior to the control concrete yet adequate for several applications including the construction of cement concrete roads for pneumatic tired traffic.