The rheological properties of high-viscosity modified reclaimed asphalt binder at multiple application temperatures

Abstract

The asphalt binder of permeable asphalt concrete has high requirements and there are few studies on mixing reclaimed asphalt (RA) with high-viscosity asphalt (HVA) for recycled permeable asphalt concrete. This study aims to research the wide-temperature-range rheological properties of high-viscosity modified reclaimed asphalt binder (HVRA) which is the bituminous binder in recycled permeable asphalt concrete. First, HVRA was prepared by mixing RA and HVA, wherein RA was extracted from reclaimed asphalt pavement (RAP) and HVA was prepared in the laboratory. Then, the properties of HVRA at multiple application temperatures were analyzed by basic indexes test, dynamic shear rheological test, and bending beam rheometer test. Finally, the comprehensive performance was contrastively evaluated by radar chart. The results revealed that the properties of HVRA are excellent when the high-viscosity modifier (HVM) content is 18 % and 20 %. Additionally, the rheological properties and fatigue resistance of the HVRA showed a decreasing trend with adding RA. Among them, considering rheological properties, the optimal content of HVM in HVA is 18 % − 20 %, and the optimal proportion of RA in HVRA is 10 % − 20 %. Furthermore, the fatigue performance of HVRA is significantly enhanced when HVM content is 18 %, especially the fatigue life of HVRA with 10% RAP is 5–9 times HVA containing 12 % HVM which is regularly used as the bituminous binder.