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The influence of aggregate, filler and bitumen on asphalt mixture moisture damage

机译：骨料，填料和沥青对沥青混合料水分破坏的影响

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摘要

Moisture damage in an asphalt mixture can be defined as the loss of strength, stiffness and durability due to the presence of moisture leading to adhesive failure at the binder-aggregate interface and/or cohesive failure within the binder or binder-filler mastic. Various test methods exist to identify the susceptibility of asphalt mixtures to moisture damage, such as the AASHTO T283 procedure. This paper describes a new combined ageing/moisture damage laboratory test known as the Saturation Ageing Tensile Stiffness (SATS) test that has been successfully used to quantify the moisture damage of a range of UK asphalt mixtures. The test consists of initial saturation prior to placing compacted asphalt mixture cylindrical specimens in a moist, high temperature and pressure environment for an extended period of time. The stiffness modulus measured after the test divided by the stiffness modulus measured before the test (retained stiffness modulus), and the specimen saturation after the test (retained saturation), are used as an indication of the sensitivity of the compacted mixture to moisture damage. In this paper, the sensitivity of the SATS test to different aggregates, fillers, binders and volumetric proportions as well as mixture types has been assessed. The results show that the SATS test is able to discriminate between different asphalt mixture combinations in terms of their moisture damage resistance. Compared to AASHTO T283, the SATS test was found to be a more aggressive conditioning protocol, although both tests ranked mixtures in a similar order with respect to moisture damage.
机译：沥青混合物中的水分破坏可以定义为由于水分的存在而导致的强度，刚度和耐久性的损失，所述水分导致在粘合剂-骨料-界面处的粘合破坏和/或粘合剂或粘合剂-填充胶泥中的内聚破坏。存在多种测试方法来确定沥青混合料对水分破坏的敏感性，例如AASHTO T283程序。本文介绍了一种新的老化/水分破坏综合实验室测试，称为饱和老化拉伸刚度（SATS）测试，该测试已成功用于量化一系列英国沥青混合物的水分破坏。该测试由初始饱和度组成，然后将压实的沥青混合料圆柱形试样在潮湿，高温和高压的环境中放置更长的时间。试验后测得的刚度模量除以试验前测得的刚度模量（保留的刚度模量）和试验后的试样饱和度（保留的饱和度），可作为压实混合物对水分破坏敏感性的指示。在本文中，评估了SATS测试对不同集料，填料，粘合剂和体积比例以及混合物类型的敏感性。结果表明，SATS测试能够区分不同的沥青混合料组合物的耐湿气破坏性。与AASHTO T283相比，SATS测试被认为是一种更具侵略性的调理方案，尽管这两种测试在水分破坏方面对混合物的排序都相似。

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