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首页> 外文会议>6th International Conference on the Bearing Capacity of Roads and Airfields Vol.1, Jun 24-26, 2002, Lisbon, Portugal >Laboratory Measurement of Crack Propagation in High Stiffness Asphalt Mixtures
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Laboratory Measurement of Crack Propagation in High Stiffness Asphalt Mixtures

机译：高刚度沥青混合料裂缝扩展的实验室测量

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摘要

This paper describes a laboratory investigation into crack propagation in High Modulus Base (HMB) materials. The Compact Tension (CT) test has been adapted for use with bituminous materials. Particular attention is given to the development of a procedure to measure crack length using a remotely controlled digital camera. A standard fracture mechanics approach has been used to calculate the Mode I stress intensity factor and the Paris law has been used to describe the rate of crack growth. Results indicate the sensitivity to applied stress increases with decreasing binder penetration and decreasing temperatures (i.e. increasing binder stiffness modulus). Results also indicate that there were large differences between the performances of different mixtures. Differences in crack propagation rate of a factor of 10 or more were common, with nominally similar grade binders.
机译：本文介绍了对高模量基（HMB）材料中裂纹扩展的实验室研究。紧凑张力（CT）测试已适用于沥青材料。特别注意了使用遥控数码相机测量裂纹长度的程序的开发。已使用标准的断裂力学方法来计算模式I应力强度因子，并使用巴黎定律来描述裂纹扩展的速率。结果表明，随着粘合剂渗透率的降低和温度的降低（即，粘合剂刚度模量的增加），对施加应力的敏感性也会增加。结果还表明，不同混合物的性能之间存在很大差异。在名义上等级相似的粘结剂中，裂纹扩展速率的差异通常是10或更大。

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