Use of accelerated loading equipment for determination of long term moisture susceptibility of hot mix asphalt
Use of accelerated loading equipment for determination of long term moisture susceptibility of hot mix asphalt
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DOI：
10.1080/10298430500158984
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发表时间：
2005-06
影响因子：
3.8
通讯作者：
R. Mallick;Robert Pelland ∥;Frederick Hugo #
中科院分区：
文献类型：
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作者：
R. Mallick;Robert Pelland ∥;Frederick Hugo #
在马萨诸塞州波士顿的洛根国际机场的某些区域，在高温和飞机载荷下，具有易受潮骨料的HMA的剥离一直是一个持续存在的问题。这些有问题的混合物在冻融调节后通常满足保留的拉伸强度标准。本研究的目的是评估使用加速加载设备识别易受潮的混合料，并评估石灰的影响。采用PG 76-28沥青结合料配制了三种不同集料的混合料.通过三种不同的方法对样本进行调节：（1）多次冻融循环，（2）使用模型移动的负载模拟器（MMLS 3）进行湿运输，以及（3）使用水分诱导应力测试仪（MIST）进行应力循环。此后，测定相应的间接拉伸强度。结果表明，加速加载可以为评价沥青混合料在高温交通条件下的抗湿损伤性能提供有用的信息。对于具有足够的抗体积膨胀-收缩水分损害的混合物，在至少六次冻融调节循环后需要进行可接受的拉伸强度试验。在高温下使用水分胁迫条件下的交通耐湿损害的评估被证明是非常有前途的。应进一步研究这些方法。熟石灰的使用提高了热拌沥青混合料在高温下对水分引起的应力破坏的抵抗力。根据这些结论，建议使用由高温下冻融和加速加载/水分诱导应力测试组成的测试方案来评估最具成本效益的抗剥落剂（液体或固体）。
Stripping of HMA with moisture susceptible aggregates, under high temperature and aircraft loading has been a persistent problem in some areas of the Logan International Airport in Boston, Massachusetts. These problem mixes generally meet the retained tensile strength criteria, after freeze–thaw conditioning. This study was conducted to evaluate the use of accelerated loading equipment for identifying moisture susceptible mixes, and also to evaluate the effect of lime. Mixes with three different aggregates were prepared with PG 76-28 asphalt binder according to specifications. Specimens were conditioned by three different methods: (1) multiple cycles of freeze–thaw, (2) wet trafficking with the model mobile load simulator (MMLS3) and (3) cycles of stress with the moisture induced stress tester, (MIST). Thereafter, the respective indirect tensile strengths were determined. The results showed that accelerated loading can provide useful information for evaluating resistance of HMA to moisture damage under traffic at high temperature. For mixes to have adequate resistance to moisture damage by volumetric expansion–contraction, acceptable tensile strength tests were needed after at least six freeze–thaw conditioning cycles. The evaluation of resistance to moisture damage under traffic at high temperature using moisture stress conditioning proved to be highly promising. The methods should be investigated further. The use of hydrated lime, improved the resistance of HMA against moisture induced stress damage at high temperatures. On the basis of these conclusions, it is recommended that testing protocols, consisting of both freeze–thaw and accelerated loading/moisture induced stress testing at high temperature, be used for evaluating the most cost-effective anti-stripping agent (liquid or solid).