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首页> 外文会议>6th International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials, (PTEBM'03) Pt.1 Apr 14-16, 2003 Zurich, Switzerland >SEMI-CIRCULAR BENDING TEST TO ASSESS THE RESISTANCE AGAINST CRACK GROWTH
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SEMI-CIRCULAR BENDING TEST TO ASSESS THE RESISTANCE AGAINST CRACK GROWTH

机译：半圆弯曲试验，以评估抗裂纹扩展性

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In the near future asphalt pavement will be subjected to more extreme conditions, like higher axle loads, increased number of vehicles passing and so on. Due to this the resistance against cracking and crack propagation will become a more important factor. Amongst others this means that a good test method will be necessary to determine the crack resistance and the crack growth rate of bituminous mixtures. In the Netherlands in the nineties of the last century a simple test was developed to measure these properties, the semi-circular bending (SCB) test. This test will be a part of the 12697-CEN test methods for characterisation of hot asphalt mixes. Recently a large number of tests were performed both on laboratory mixtures and on specimens obtained from the road to study the possibilities of the pseudo-static SCB test as a practical tool to determine the fracture toughness (=crack growth resistance). From the results of these tests it was concluded that the repeatability, the reproducibiliry and the discrimination between "good" and "bad" materials was good. Next to these tests also a cyclic SCB-test was developed to determine the Paris Law constants, i.e. crack growth rate parameters A and m. The tests performed with bituminous mixtures made in the laboratory indicate that the cyclic SCB-test is very promising for determination of the Paris constants, possibly enabling ranking of asphalt mixtures.
机译：在不久的将来，沥青路面将受到更极端的条件，例如更高的轴载，通过的车辆数量增加等。因此，抗开裂和裂纹扩展的能力将成为更重要的因素。除其他外，这意味着需要一种好的测试方法来确定沥青混合物的抗裂性和裂纹扩展速率。上个世纪九十年代的荷兰，开发了一种简单的测试来测量这些特性，即半圆弯曲（SCB）测试。该测试将是表征热沥青混合料的12697-CEN测试方法的一部分。最近，对实验室混合物和道路样品进行了大量测试，以研究伪静态SCB测试作为确定断裂韧性（=抗裂纹增长性）的实用工具的可能性。从这些测试的结果可以得出结论，重复性，再现性和“好”和“坏”材料之间的区别是好的。在这些测试之后，还开发了循环SCB测试来确定巴黎定律常数，即裂纹扩展速率参数A和m。在实验室中用沥青混合料进行的测试表明，循环式SCB试验对于确定巴黎常数非常有希望，有可能对沥青混合料进行分级。

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