华南理工大学学报(自然科学版) ›› 2008, Vol. 36 ›› Issue (2): 23-28.

• 交通运输工程 • 上一篇    下一篇

基于重复蠕变的改性沥青高温指标

张肖宁孟勇军邹桂莲2   

  1. 1. 哈尔滨工业大学 交通科学与工程学院, 黑龙江 哈尔滨 150090; 2. 华南理工大学 交通学院, 广东 广州 510640
  • 收稿日期:2007-09-20 修回日期:2007-11-02 出版日期:2008-02-25 发布日期:2008-02-25
  • 通信作者: 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
  • 作者简介: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.
  • 基金资助:

    交通部西部资助项目(200131822341)

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)

摘要: 通过对不同沥青进行不同模式下的重复蠕变试验,分析了NCHRP推荐的基于流变模型拟合的蠕变劲度的粘性成分Gv指标,研究了Gv对不同沥青高温路用性能评价的优势和缺陷所在.为了对沥青提出一个有效的高温评价指标,基于该试验提出了包含描述延迟弹性变形在内的指标Gv(t)作为对Gv的修正,经过试验数据验证其合理性,弥补了Gv在因延迟弹性影响残余变形拟合方面的缺陷,为路面实际应用的沥青选择提供了一个新的依据.

关键词: 改性沥青, 重复蠕变, 流变模型, 高温指标, 延迟弹性

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