Moisture damage in asphalt mixtures using the modified SATS test and image analysis
Moisture damage in asphalt mixtures using the modified SATS test and image analysis
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DOI：
10.1016/j.conbuildmat.2013.02.003
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发表时间：
2013-06
影响因子：
7.4
通讯作者：
Rawid Khan.;J. Grenfell;A. Collop;G. Airey;Hannah Gregory
中科院分区：
文献类型：
--
作者：
Rawid Khan.;J. Grenfell;A. Collop;G. Airey;Hannah Gregory
本文采用改进的饱和老化拉伸刚度（SATS）试验和图像分析方法研究了沥青的湿损伤。花岗岩和石灰石骨料与40/60渗透级沥青制成的试样在改进的SATS试验中进行了测试。样品在SATS测试前、初始饱和后和SATS测试完成后在x射线CT设备中进行扫描。从测试样品中提取沥青，并在高分辨率x射线CT （Nanotom）中单独扫描。提取的沥青在DSR中测试了剪切流变性能。由花岗岩（酸性）和石灰石（碱性）骨料制成的试样具有相似的渗透性，并且对于具有高设计空隙含量的试样而言，渗透性较高。碱性骨料试件的刚度高于酸性骨料试件。老化粘结剂（沥青）的主曲线与原始粘结剂（沥青）的主曲线不同。同时，观察到的粘结剂的显微组织在时效和未加工时也有所不同。
This study investigated damage in asphalt due to moisture by using the modified saturation ageing tensile stiffness (SATS) test along with image analysis. Specimens made from both granite and limestone aggregate with a 40/60 penetration grade bitumen were tested in the modified SATS test. The samples were scanned within an X-ray CT facility before the SATS testing, after the initial saturation and at the completion of the SATS test. Bitumen was extracted from tested specimens and scanned separately in a high resolution Nanotom (high resolution X-ray CT). The extracted bitumen was tested in a DSR for shear rheological properties. The specimens made from granite (acidic) and limestone (basic) aggregate were found to have similar permeability and this was found to be high for specimens having high design air void content. Specimens made from basic aggregate had higher stiffness than the specimens made from acidic aggregate. The master curves of the aged binder are different from those of the virgin binder (bitumen). Also the microstructure of binder observed was different for aged and virgin binder.