Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (2): 23-28.

• Traffic & Transportation Engineering • Previous Articles     Next Articles

High-Temperature Index of Modified Asphalt Based on Repeated Creep

Zhang Xiao-ning1  Meng Yong-jun1  Zou Gui-lian2   

  1. 1. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China;2, School of Traffic and Communications, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2007-09-20 Revised:2007-11-02 Online:2008-02-25 Published:2008-02-25
  • Contact: 张肖宁（1951-），男，教授，博士生导师，主要从事道路工程材料与结构研究． E-mail:prozxn@163.com
  • About author:张肖宁（1951-），男，教授，博士生导师，主要从事道路工程材料与结构研究．
  • Supported by:

    交通部西部资助项目（200131822341）

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Abstract:

Gv, a rheological model-based index recommended by NCHRP, is usually used to describe the creep strength. In this paper, the repeated creep experiments of different asphalts were carried out in different modes to investigate the advantages and shortcomings of Gv in the evaluation of high-temperature performance of asphalt. Based on the experimental results, a new index Gv （t） which takes into consideration the delayed elasticity was worked out as an effective evaluation index of high-temperature performance, the rationality of which was then verified by experimental data. It is found that the proposed index Gv （t） overcomes the difficulty of Gv in fitting the residual deformation due to the delayed elasticity, and provides a new criterion for the selection of asphalt in pavement construction.

Key words: modified asphalt, repeated creep, rheological model, high-temperature index, delayed elasticity