The Effect of Different Mixing and Compaction Temperatures on the Particle (Cantabro) Loss in Porous Asphalt Pavements

Porous asphalt (PA) is a type of pavement with an open-graded aggregate that contains higher air voids than the conventional asphalt pavements after compaction, which allows precipitation waters to infiltrate from the pavement surface to the lower layers. The particle loss in the wear layer causes surface deterioration, which affects pavement performance. In addition, the porosity nature of porous asphalt leaves the pavement under the effect of air and water continuously, which accelerates the oxidation rate and affects the surface properties of the pavement. Moreover, these factors can affect the bitumen-aggregate bond strength and cause cohesion degradation within the asphalt film, causing the bitumen to peel from aggregate. The performance of porous asphalt, particularly strength and durability, is greatly affected by compaction temperature. Higher compaction temperatures can reduce the air voids of the mix, so the required mix densities may not be achieved. In this study, the particle loss of porous asphalt samples prepared at 3 different compaction temperatures by using unmodified bitumen, SBS®, Elvaloy®, and Sasobit® modified bitumen was investigated and the optimum mixing and compaction temperature was determined.