Case Study of Warm-Mix Asphalt Moisture Susceptibility in Birmingham, Alabama
Case Study of Warm-Mix Asphalt Moisture Susceptibility in Birmingham, Alabama
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发表时间：
2009
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通讯作者：
A. Kvasnak;R. West
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作者：
A. Kvasnak;R. West
温拌沥青混合料（WMA）路面的耐久性和长期使用性能是目前研究的主要内容之一。具体而言，WMA的主要关注点之一是抵抗湿气损害的能力。与热拌沥青混合料（HMA）相比，对防潮性的关注源于实验室中较低的潮湿敏感性结果（1-7）。据推测，较低的温度可能不允许骨料的适当干燥。如果集料中残留水分，可能会妨碍粘结剂和集料充分粘结。与HMA相比，还存在与WMA缺乏沥青吸收相关的一些问题。如果沥青没有填充骨料中的空隙，则水分有可能填充这些空隙。然而，尽管与HMA相比，WMA的湿度敏感性较低，但迄今为止对WMA路面的现场评估尚未发现任何水分损害问题。本文对实验室和工厂生产的混合料的湿敏性试验结果进行了比较。评估的混合物被用作2007年8月在亚拉巴马的WMA演示的一部分。使用三种湿度敏感性测量来评估两种混合物的湿度敏感性。结果表明，实验室生产的WMA比工厂生产的混合料更容易发生湿敏性。HMA表现出比WMA更有利的湿敏感性值，然而，大多数WMA样品确实满足湿敏感性标准。
One of the main concentrations of warm mix asphalt (WMA) research is now on the durability and performance of WMA pavements overtime. Specifically, one of the major concerns with WMA is the ability to resist moisture damage. The concern about moisture resistance stems from lower moisture susceptibility results in the laboratory in comparison to hot mix asphalt (HMA) (1-7). It has been hypothesized that the lower temperatures may not allow for proper drying of aggregates. If moisture remains in the aggregates, it could prevent binder and aggregate from adequately bonding. There is also some concern related to the lack of absorption of asphalt for WMA in comparison to HMA. If asphalt is not filling the voids in the aggregate than there is a potential for moisture to fill those voids. However, despite lower moisture susceptibility results for WMA in comparison to HMA, field evaluations thus far of WMA pavements have not noted any issues with moisture damage. In this paper, moisture susceptibility test results for both laboratory and plant produced mixes are compared. The mixes evaluated were used as part of the August 2007 WMA demonstration in Alabama. Three moisture susceptibility measures were used to assess the moisture susceptibility of the two mixes. The results indicated that the laboratory produced WMA was more prone to moisture susceptibility than the plant produced mix. The HMA exhibited more favorable moisture susceptibility values than the WMA, however, most of the WMA samples did meet the moisture susceptibility criteria.