Experimental investigation of preventive maintenance materials of porous asphalt mixture based on high viscosity modified bitumen

Abstract

Porous asphalt wearing course has been widely used all over the world. Due to the high porosity and the good stone quality, porous asphalt provides good skid resistance, noise reduction ability and reduces significantly splash and spray in wet conditions. In Asian countries, high viscosity modified bitumen is commonly used as binder of porous asphalt mixture to increase the anti-raveling and rutting resistance property. However, because of the open gradation and rapid aging of the binder, raveling and raveling-induced pitting are still the most common type of destruction for porous asphalt wearing course in long term service. To prevent the occurrence of raveling, a study on the preventive maintenance materials for porous asphalt wearing course based on high viscosity modified bitumen is conducted.Based on the mechanisms of the raveling destruction, the properties for preventive maintenance materials to be developed are proposed correspondingly. Then laboratory measurements are carried out to investigate the performance of the materials, including tests on apparent viscosity, cohesion, adhesion to stone, rejuvenation effect and properties of porous asphalt mixture treated with the preventive materials. Based on the experiment results and the analyses, the performances of different preventive maintenance materials are concluded. It provides a technical support for preventive maintenance engineering on porous asphalt using high viscosity modified bitumen as binder.