Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (11): 7-11，21.

• Traffic & Transportation Engineering • Previous Articles     Next Articles

Investigation into Viscoelastic-Plastic Fracture Parameters of Asphalt Mixture

Wang Duan-yi1  Liu Jing-hui1  Liu Yu2   

  1. 1. Research Institute of Road Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
  • Received:2008-12-25 Revised:2009-03-23 Online:2009-11-25 Published:2009-11-25
  • Contact: 王端宜（1962-），男，教授，博士生导师，主要从事道路工程结构和材料研究． E-mail:tcdywang@scut．edu．cn
  • About author:王端宜（1962-），男，教授，博士生导师，主要从事道路工程结构和材料研究．
  • Supported by:

    国家自然科学基金资助项目（50278037）

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Abstract:

Based on the semi-circular bending test, the delayed cracking properties of asphalt mixture, a typical viscoelastic-plastic material, are evaluated using the J-integral theory and the delayed-cracking initiation time. The delayed-cracking initiation time in different loading and temperature conditions as well as the fracture toughness at different testing temperatures is also measured to reveal the rules of crack initiation. The results show that the crack initiation displays obvious viscoelastic-plastic characteristics, and that a simple rheological constitutive model is applicable enough for the evaluation of fracture performance of asphalt mixture using the J-integral theory and the delayed-cracking initiation time.

Key words: asphalt mixture, J-integral, semi-circular bending test, fracture toughness, delayed cracking