An Experimental Study of Permeable Asphalt Pavement Incorporating Recycled Concrete Coarse Aggregates

Abstract

Urban waterlogging due to sudden rainfall leads to critical issues. This study aims to develop sustainable porous asphalt pavement by incorporating different proportions of recycled coarse aggregate. Recycled coarse aggregate from waste laboratory-tested concrete in 19, 12.5, and 9.5 mm sizes was prepared for a porous asphalt mix series (Mix-Types 1-9). The study showed that optimal aggregate ratios performed well in porous asphalt mixes. Mix-Type-3 with the aggregate ratio of 19:12.5:9.5 mm (1:1:0.5) achieved an optimal stability of 8.88 kN at the minimum flow rate. The movement of water flow results revealed that permeability decreases with time. The Mix-Type-3 permeability reductions were found to be 16.75% and 30.14% at 6 and 12 months, compared to the permeability of fresh mixes. The study results revealed that the Mix-Type-3 retained the highest stability level, and the permeability fell within the standard values. Hence, it is concluded that Mix-Type-3 balances in all parameters and is a viable choice for effective and sustainable urban water management.