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Alternative methodology for assessing cracking resistance of hot mix asphalt mixtures with overlay tester

机译：使用覆盖测试仪评估热拌沥青混合料抗裂性的替代方法

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摘要

Several highway agencies have either implemented or considered implementing performance tests to predict the cracking potential of asphalt concrete (AC) mixes in the laboratory setting. One such test, the overlay tester (OT), simulates the opening and closing of the cracks induced by daily temperature variations and tensile strain generated by the traffic load. The variability of the OT results is expressed as a major concern in reliably characterising cracking potential of the AC mixes. A more fundamental analysis process and more mechanistic performance indicators were implemented that consider the two stages of the cracking mechanism (i.e. crack initiation and crack propagation). The repeatability of the proposed performance indices, critical fracture energy and crack progression rate, seems to be better than the current criterion based on the number of cycles to dissipate 93% of the initial maximum peak load. The proposed cracking methodology and associated preliminary failure limits seem to characterise and discriminate satisfactorily the cracking resistance of AC mixes. Given its promise in this study, the proposed OT test method is recommended as a routine test during the mix-design process of AC mixes to predict and screen their cracking susceptibility.
机译：一些高速公路机构已经实施或考虑实施性能测试，以预测实验室环境中沥青混凝土（AC）混合料的开裂可能性。一种这样的测试，即覆盖测试仪（OT），可模拟由每日温度变化和交通负荷产生的拉伸应变引起的裂纹的开合。 OT结果的可变性表示为可靠表征AC混合物开裂潜力的主要问题。实施了更基本的分析过程和更多的机械性能指标，其中考虑了裂纹机理的两个阶段（即裂纹萌生和裂纹扩展）。根据耗散初始最大峰值载荷的93％的循环次数，所提出的性能指标，临界断裂能和裂纹扩展速率的可重复性似乎要好于当前标准。拟议的裂化方法和相关的初步破坏极限似乎可以令人满意地表征和区分AC混合物的抗裂性。鉴于这项研究的前景，建议将建议的OT测试方法作为AC混合料的混合设计过程中的常规测试，以预测和筛选其开裂敏感性。

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