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首页> 外文会议>Fourth European Symposium on Performance of Bituminous and Hydraulic Materials in Pavements, Apr 11-12, 2002, Nottingham, United Kingdom >Hardening and aging of bituminous materials in hot arid regions
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Hardening and aging of bituminous materials in hot arid regions

机译：干旱地区沥青材料的硬化和老化

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摘要

In Libya a large network of thousands of kilometers of highways and airfields was constructed during the last three decades. Unfortunately, many of these pavements have suffered from early distress in form of surface cracks appearing at pavement outer edges and along the white and yellow road markings. Preliminary diagnoses of these cracks indicated that they are non load-associated thermal cracks caused by the action of the severe environment. The basic purpose of this study was to investigate the problem of rapid hardening and aging of bituminous materials in hot arid regions. An experimental program has been carried out to follow up the process of hardening by monitoring the loss of volatile components and measuring the viscosity of the bitumen. Test samples were taken from selected sites where this phenomenon is experienced, to find out the effect of hardening due to aging and exposure to solar radiation at different depths from the surface and at different ages. The Rheometer test was used to measure the viscosity of the bitumen binder. Two further tests for monitoring the hardening of the bitumen binder were carried out. These included a chemical analysis to measure the loss of volatile components of the binder using the Gas Chromatography technique, and the measurement of the apparent viscosity of the bitumen using the sliding plate viscometer. Finally, conclusions and recommendations drawn from this work are summarized.
机译：在过去的三十年中，利比亚建立了数千公里的高速公路和飞机场的大型网络。不幸的是，这些路面中的许多已经遭受了早期的困扰，其形式为在路面外缘以及沿着白色和黄色道路标记出现的表面裂缝。对这些裂纹的初步诊断表明，它们是由恶劣环境的作用引起的与载荷无关的热裂纹。这项研究的基本目的是研究热干燥地区沥青材料的快速硬化和老化问题。通过监测挥发性成分的损失并测量沥青的粘度，已经进行了一个实验程序来跟踪硬化过程。从发生这种现象的选定地点抽取测试样品，以找出由于老化和暴露在距表面不同深度和不同年龄的太阳辐射下而导致的硬化效果。流变仪测试用于测量沥青粘合剂的粘度。进行了两个进一步的测试以监测沥青粘合剂的硬化。其中包括使用气相色谱技术进行化学分析以测量粘合剂中挥发性成分的损失，以及使用滑板粘度计对沥青的表观粘度进行测量。最后，总结了从这项工作中得出的结论和建议。

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