engleski

The influence of porous asphalt mix design on raveling resistance

Porous asphalt is type of open graded bituminous mixture for wearing courses. The reasons for its recent frequent usage as well as increase of research interest are the environmental benefits for example storm water management. However, there are some kinds of defects which can provoke deterioration of this type of pavement surface before expected project life. The dominant defect type of porous asphalt pavements is raveling. Raveling is process of dislodgement of aggregate particles caused by loss of bond between aggregate particles and asphalt binder. In order to assess the raveling resistance in porous asphalt pavements, the Cantabro abrasion test was performed on the series of specimens. Subject of this paper is divided in two phases: the first phase is to determine dependence of particle size distribution, bitumen content and percent of air voids on raveling resistance and the second phase deals with optimization of mix design from first phase in order to propose measures for asphalt properties improvement. The analysis shows that usage of polymer modified bitumen has the greatest influence on raveling resistance of porous asphalt.

porous pavements ; raveling ; laboratory testing

nije evidentirano