Effect of different high viscosity modifiers on rheological properties of high viscosity asphalt

Abstract

High viscosity asphalt (HVA) has been a great success as a drainage pavement material. However, the larger porosity of drainage asphalt mixtures weakens the cohesion and adhesion and leads to premature rutting, water damage, spalling and cracking. The purpose of this study was to investigate the rheological properties of HVA prepared using different high viscosity modifiers through conventional tests, Brookfield viscosity tests, dynamic shear rheometer tests and bending beam rheometer tests. The conventional performance results demonstrated SBS + rubber asphalt (SRA-1/2) exhibited excellent elastic recovery and low-temperature flexibility. The 60°C dynamic viscosity results indicated TPS + rubber asphalt (TRA) had the excellent adhesion. The rotational viscosity results and rheological results indicated that SRA-2 not only exhibited excellent temperature stability and workability, as well as excellent resistance to deformation and rutting resistance, but also exhibited excellent low-temperature cracking resistance and relaxation performance. Based on rheological results, the PG classification of HVA was 16% rubber + asphalt for PG76-22, 20% rubber + asphalt for PG88-22, TRA and SRA-1/2 for PG88-28. From comprehensive evaluation of the viscosity, temperature stability and sensitivity, as well as high/low temperature performance of HVA, SRA-2 was found to be more suited to the requirements of drainage asphalt pavement materials.

Graphical abstract

Keywords

high viscosity asphalt / rheological properties / rubber / modifier / viscosity

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Acknowledgements

The work described in this paper is supported by the National Natural Science Foundation of China under Grant No. 51778136 and Technology Research and Development Project of China Railway under No. J2019G003. And the authors would like to thank staffs at National Demonstration Center for Experimental Road and Traffic Engineering Education (Southeast University), for their active contribution to this research.

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2021 Higher Education Press 2021.