The Phenomenon of Aggregate Damage in Porous Asphalt

Porous asphalt is a pavement mixture developed to improve road safety. It can lessen the effects of puddles during heavy rainfall and has good skid resistance. To support its function, this kind of mixture has a high air void content. In order to facilitate water drainage, porous asphalt is designed with an open gradation and an interconnected void structure. The gradation must consist of robust and durable aggregates to withstand deterioration caused by the loads and environmental exposure experienced by the mixture and to preserve the connectivity of the void structure. The aggregate damage phenomenon, as determined by the aggregate damage level, is examined in this study. In addition, distinct aggregate damage patterns were identified. The study's findings demonstrate that two types of aggregates and mixtures with different asphalt contents exhibit distinct aggregate damage patterns. Additionally, various degrees of damage were discovered. Particularly in porous asphalt mixtures, it is believed that the factors influencing the pattern and degree of aggregate damage include the Los Angeles value (aggregate hardness) and the asphalt film, both of which are influenced by the asphalt content. Diorite is recommended as a suitable aggregate for porous asphalt mixtures. The notable degree of aggregate damage at a size of 6.7 mm may serve as the foundation for future investigations, along with additional research on the impact of the mixture's asphalt content.