Mechanical Performances of Pretreated Porous Convenient Asphalt Concrete

Convenient Asphalt Concrete (CAC) is a kind of Asphalt Concrete with new technology, in which a pre-treated emulsified Asphalt is prepared firstly to avoid demulsification during mixing and then mixed directly and steadily with cement and aggregate. In this technology, cement and pre-treated emulsified Asphalt are evenly mixed into a binder, namely Convenient Asphalt Mastic (CAM). CAM is a new type of binder for modified asphalt concrete, with low energy consumption, less pollution, and normal atmospheric temperature construction. The mixture, named Porous Convenient Asphalt Concrete (PCAC), is formed by mixing CAM as a binder and aggregate with gradation adjustment according to the ‘Permeable Pavement Guide’ of the Japan Road Contractors Association. In this study, the mechanical properties of PCAC and Hot Mix Porous Asphalt Concrete (PA) are compared and analyzed under the control of wrap film thickness and porosity. The experimental results show that at the same porosity and under the most appropriate film thickness of PCAC and PA, the Marshall Stability Value and the Tensile Strength of PCAC is 3 to 4 times stronger than PA all. There is positive correlation with first, the strength of the binder wrapped around aggregate granule, and second, the aggregate particles being bonded well with each other. It is because that CAM has higher consistency, it can form thicker wrap film around the aggregate without adding any staple fiber, and CAM has higher strength after hardening. Therefore, the overall mechanical performances of PCAC are much better than PA. Consequently, PCAC can bear a larger axle load than PA. That reduces the damage of axle pressure on porous asphalt pavement and prolongs the service life of porous asphalt pavement.