Research on Interfacial Shear Characteristics of Crumb Rubber Modified Asphalt Concrete Bridge Deck Pavement Structure

Abstract

The interfacial shear characteristics and the influence of overloading on the structure of SBS (styrene-butadiene-styrene) and crumb modified asphalt bridge deck pavements are studied in this paper. Crumb rubber modified asphalt bridge deck pavement is applicable to Inner Mongolia cold regions. These pavements are evaluated through the indoor asphalt concrete bridge deck pavement interfacial shear contrast test. The results indicate that for the interfacial shear strength between asphalt pavement structure of lower layer and concrete bridge deck pavement, the strength of SBS modified asphalt pavement is slightly greater than the crumb rubber modified asphalt pavement. For the interfacial shear strength between asphalt pavement structure of upper layer and lower layer, the strength of crumb rubber modified asphalt pavement under the overload less than 50% is slightly greater than SBS modified asphalt pavement shear strength. The interfacial shear strength between the lower layer and the concrete bridge deck pavement of two kinds of modified asphalt pavement structure is less than the interfacial shear strength between the upper layer and the lower layer. The interfacial shear deformation of crumb rubber modified asphalt is greater, and the interfacial shear deformation between the lower layer and the concrete bridge deck pavement of two kinds of modified asphalt pavement structure is less than the interfacial shear deformation between the upper layer and the lower layer under the vertical stress less than 1.05MPa. Finally, the shear stress of crumb rubber modified asphalt concrete bridge deck pavement structure under the standard load is calculated by the finite element software ABAQUS. Comparing and analyzing the experimental results shows that the bridge deck pavement meets the shear requirements.