Effects of Substitution of Fine Aggregate with Recycled Asphalt Pavement on Compressive Strength of Normal Concrete

Abstract

In this research, the compressive strength of concrete utilizing fine recycled asphalt pavement (fine RAP) as fine aggregate substitution for natural sand is investigated at weight percentages of 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 percent. The compressive strengths of concrete were designed according to ACI 211.1 standard for 18 MPa, 25 MPa, 32 MPa and 40 MPa at 28 days of curing. The compressive strengths of the concrete using fine RAP aggregate in this study were compared to the ones that use the natural aggregate in the same proportions. From the results of the tests, it was found that the compressive strength of concrete using fine RAP is dependent on the amount of Fine RAP used in the mix proportions. Test results also indicated that there is a systematic reduction in the compressive strengths with the increase in the weight percentages of the fine RAP. The relationship between the normalized compressive strength and the weight percentages of the fine RAP were proposed. Finally, a suggested strength reduction factor for the concrete using fine RAP as aggregate was also proposed.