The Journal of Science and Engineering Applications (JSEA)

Abstract

Reclaimed asphalt pavement (RAP) aggregates, which are typically deposited in surrounding areas either legally or illegally, accumulate in enormous quantities as a result of recycling flexible pavement. The selection of Roller-Compacted Concrete (RCC) for suitable applications yields a sustainable pavement that meets the economic, environmental, and social demands of contemporary infrastructure. The incorporation of RAP in RCC pavements offers several benefits and drawbacks. The notable advantages of employing RAP aggregates include reduced impact on RAP disposal issues, decreased greenhouse gas emissions, decreased dependence on natural aggregates, and lower transportation costs. Utilizing RAP as a substitute for aggregate in RCC may reduce the amount of natural aggregate used in RCC. This study examined the effects of substituting 25%, 50%, 75%, and 100% of the coarse aggregate weight in RCC with highly-aged reclaimed asphalt pavement (hard RAP) on compressive strength, splitting tensile strength, flexural strength, modulus of elasticity at 7, 28, and 91 days of curing, and drying shrinkage at 14, 21, 28, and 91 days of curing. The substitution of 100% hard RAP adversely affected the characteristics of RCC, resulting in lowered compressive, splitting tensile, and flexural strengths, as well as a reduction in the modulus of elasticity across all curing durations. After a curing time of 28 days, the M-50%H-RAP RCCP mixes exhibited a reduction in compressive, splitting tensile, and flexural strengths, along with the modulus of elasticity, of 26.5%, 30.6%, 20%, and 35.6%, respectively. The drying shrinkage significantly increases as coarse aggregate is substituted with hard RAP.  After 28 days of curing, the drying shrinkage rate reaches 10% when 100% of the coarse aggregate is substituted with hard RAP.