"Analysis on top-down cracking resistance of rubber-plastic modified asphalt pavement"

Abstract

The properties of rubber-plastic modified asphalt mixture and SBS modified asphalt mixture were compared by splitting test, triaxial repeated load test and small beam bending test, and the stress variation law of the upper layer cracks on asphalt pavement under dynamic load was analyzed by constructing finite element model. The results showed that tensile property and high-temperature deformation resistance of rubber-plastic modified asphalt mixture were better than those of SBS modified asphalt mixture, and rubber-plastic modified asphalt could improve deformation resistance of asphalt concrete pavement. Low-temperature cracking resistance of rubber-plastic modified asphalt mixture was better than that of SBS modified asphalt mixture, and the former could improve the top-down cracking resistance of asphalt pavement. Under the action of dynamic load, the tensile stress of the upper layer in the structural layer of asphalt pavement increased gradually, leading to the cracking of top-down crack of asphalt pavement, and rubber-plastic modified asphalt mixture could increase the maximum tensile stress during the failure of the upper layer, resulting in the reduction in the cracking possibility of top-down crack of asphalt pavement.

Keywords

• road engineering
• rubber-plastic modified asphalt
• top-down cracking resistance
• mechanical property
• finite element simulation