Porous Asphalt Mix Design Pavement by Incorporating a Precise Proportion of Recycled Coarse Aggregate

In recent years, urban waterlogging has resulted in a high risk of accidents, loss of life, economic loss, and water pollution in large and medium-sized cities. This study aims to propose porous asphalt pavement by a newly developed method for preventing and controlling urban waterlogging. Porous asphalt mix designs have been studied by incorporating recycled coarse aggregate proportions (12.5 mm: 9.5 mm: 6.3 mm) in the mixes (S1 to S10). The Marshall stability test evaluated the stability and flow of the prepared mixes. The developed model on the falling head permeability test measured the permeability of the mixes. The developed model evaluated the initial permeability coefficient (k0) and permeability coefficient (k360) after exposure to the samples for one year in the open environment. The results of porous asphalt mixes show a closed relation between stability and flow. The stability was found to increase by decreasing flow. The aggregate ratio (12.5 mm: 9.5 mm: 6.3 mm) 2:1:0 achieved the highest stability, 20.2 kN, while a 0:1:1 ratio has the lowest, 11 kN. The maximum permeability coefficient (k0) and (k360) were recorded as 0.351 cm/sec and 0.237 cm/sec, respectively. The mix, S8, achieved the highest stability value, 20.2 kN, when (k0) and (k360) were 0.188 cm/sec and 0.104 cm/sec, well within the recommended value from (0.0347 cm/sec to 0.1157 cm/sec). It can be concluded that mix S8 is the best mix of the present study in terms of best aggregate proportion, stability and flow, and permeability coefficients of (k0) and (k360).