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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications >Laboratory assessment of the resistance to crack propagation in high-stiffness asphaltic materials
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Laboratory assessment of the resistance to crack propagation in high-stiffness asphaltic materials

机译：高硬度沥青材料的抗裂纹扩展性能的实验室评估

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This paper describes laboratory work undertaken to measure the resistance to crack propagation of bituminous materials comprising a range of binder grades from different sources. The compact tension (CT) test has been adapted for use with bituminous materials, and an image analysis technique, based on digital photographs of the specimen taken during testing, has been used to quantify crack length. Linear elastic fracture mechanics (LEFM) principles have been used to calculate the mode I stress intensity factor (SIF), and the Paris law has been used to quantify crack growth. Results show that the general trend is for the Paris law exponent n to decrease and for the multiplier A to increase with increasing temperature for each of the materials, indicating that, the harder the bitumen, the greater is the sensitivity to overloading. A good correlation was found between the values of A and n, and also between the values of A in the Paris law and the stiffness modulus of the asphaltic mixture. It was found that mixtures containing the nominal 15 penetration grade binders were least sensitive to variations in stiffness of the mixture, and mixtures containing the nominal 35 and 50 penetration grade binders were most sensitive to variations in stiffness of the mixture. The number of standard wheel loads required to cause a crack to propagate through the asphalt layer of a typical minor and major flexible pavement structure have been estimated using data from the CT testing. Results show that there is a good correlation between the stiffness modulus of the asphalt mixture and the predicted number of load applications to failure. The predicted number of load applications to failure increases as the stiffness modulus of the asphalt increases.
机译：本文介绍了为测量沥青材料的抗裂纹扩展性而进行的实验室工作，这些材料包括来自不同来源的一系列粘合剂等级。紧凑张力（CT）测试已适合与沥青材料一起使用，并且基于测试过程中所采集样品的数字照片的图像分析技术已被用于量化裂纹长度。线性弹性断裂力学（LEFM）原理已用于计算模式I应力强度因子（SIF），巴黎定律已用于量化裂纹扩展。结果表明，每种材料的总体趋势是随着温度的升高，巴黎定律指数n减小，乘数A增大，这表明沥青越硬，对重载的敏感性越大。在A和n的值之间以及巴黎定律中A的值与沥青混合料的刚度模量之间发现了很好的相关性。发现含有标称15渗透等级粘合剂的混合物对混合物的刚度变化最不敏感，而含有标称35和50渗透等级粘合剂的混合物对混合物的刚度变化最敏感。已使用CT测试的数据估算了导致裂纹传播通过典型的次要和主要柔性路面结构的沥青层所需的标准车轮载荷的数量。结果表明，沥青混合料的刚度模量与预测的破坏载荷次数之间具有良好的相关性。随着沥青的刚度模量增加，预计施加到破坏的载荷数量也会增加。

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