Experimental evaluation of long- and short-term moisture damage characteristics of asphalt mixtures
Experimental evaluation of long- and short-term moisture damage characteristics of asphalt mixtures
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DOI：
10.1080/14680629.2015.1066705
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发表时间：
2016-01-02
影响因子：
3.7
通讯作者：
Scarpas, Athanasios
中科院分区：
文献类型：
--
作者：
Varveri, Aikaterini;Avgerinopoulos, Stavros;Scarpas, Athanasios
湿气损伤敏感性评估采用一种调理方案，包括两种调理类型，即浴液浸泡和孔隙压力应用。该方案被用来量化长期和短期的水损伤过程对沥青混合料的影响。此外，采用计算机断层扫描和图像分析技术来表征孔隙压力造成的损伤。采用湿致敏感性试验装置，对不同骨料和沥青类型的压实多孔沥青样品进行了水浸和循环孔隙压力组合试验，随后采用间接拉伸试验进行了测试。结果表明，湿化强度退化受养护制度、养护时间、骨料和粘结剂类型的影响。总的来说，聚合物改性沥青和砂岩骨料的沥青混合料表现出最好的抗湿性能。然而，长期和短期的水分破坏机制对混合料的降解有不同的影响。重复孔隙压力对混合料抗拉强度有显著影响。图像分析揭示了孔隙压力对沥青混合料孔隙含量和连通性的影响，而视觉观察表明，重复的孔隙压力通过打开新的流动路径和侵蚀细砂和胶泥颗粒来诱导损伤。
Moisture damage susceptibility was evaluated using a conditioning protocol, which comprises two conditioning types, namely bath immersion and pore pressure application. The protocol was used to quantify the effect of long- and short-term moisture damage processes on asphalt mixtures. In addition, computed tomography scanning and image analysis techniques were employed to characterise damage due to pore pressure. Compacted porous asphalt samples, with various aggregate and bitumen types, were conditioned by combinations of water immersion and cyclic pore pressures by means of the moisture-induced sensitivity tester, and subsequently tested using the indirect tensile test. The results indicated that strength degradation due to moisture is influenced by the conditioning regime and time, as well as by aggregate and binder types. Overall, asphalt mixtures with polymer-modified bitumen and sandstone aggregates exhibited the best performance against moisture. Nevertheless, the long- and short-term moisture damage mechanisms had a diverse effect on mixture degradation. Repeated pore pressures were found to have a significant effect on mixture tensile strength. Image analysis revealed the effect of pore pressures on air voids content and interconnectivity of asphalt mixtures, while visual observations suggested that repeated pore pressures induce damage by opening new flow paths and eroding fine sand and mastic particles.