ASSESSMENT OF CONCRETE STRENGTH INCORPORATING COARSE AGGREGATES RECYCLED FROM DEMOLISHED CONCRETE (original) (raw)

Due to rapid industrialization, the production and utilization of concrete is increased which causes depletion of natural resources and creates massive amount material waste and demolition activities. Therefore, recycling of demolished concrete for new construction is essential to preserve the natural resources. In the present study, recycled coarse aggregates from site tested concrete specimen were used to make concrete to investigate the recycled concrete strength. Moreover, six different types of fineness modulus (FM value 1.0, 1.10, 1.25, 1.30 and 1.40) were used for varying the fine aggregates. Two design strengths (2500 psi and 3500 psi) were set as target strength for recycled concrete. Based on the test results, it was clearly seen that for the design strength of 2500 psi, the maximum compressive strength can be achieved for fine aggregates with FM around 1.25. Similar trend of results was also observed for the design strength of 3500 psi. Therefore, it can be concluded that low strength concrete made with recycled aggregate gives satisfactory output to obtain target strength.