Study on microstructure of rubberized recycled hot mix asphalt based X-ray CT technology
Study on microstructure of rubberized recycled hot mix asphalt based X-ray CT technology
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基于X射线CT技术的橡胶再生热拌沥青微观结构研究
DOI：
10.1016/j.conbuildmat.2016.05.166
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发表时间：
2016-09-15
影响因子：
7.4
通讯作者：
Fang, Jun
中科院分区：
文献类型：
--
作者：
Wang, Hainian;Zhang, Ran;Fang, Jun
再生沥青混合料的微观结构特性对其宏观力学性能有重要影响。本研究结合IPP软件，通过CT扫描分析再生橡胶热沥青混合料的离散性、RAP用量和沥青膜厚度。再生沥青路面（RAP）含量设定为25%，在实验室制作沥青混合料试件。制备了不同种类的热再生橡胶沥青混合料，计算了在4.2%、4.5%、4.8%、5.1%和5.4% 5种不同沥青掺量和3种不同骨料粒径下沥青的膜厚。结果表明，胶化再生热混合沥青的分布可以用CT进行分析，认为其分布是均匀的，左侧集料平均粒径为2458.93 mu m，右侧集料平均粒径为2487.38 mu m， CT技术计算RAP用量是可靠的。RAP用量计算值为23.98%，实际误差为4.1%，相对较小。CT得到的再生胶化热混合沥青的沥青膜厚度是可靠的。它与使用Hweem方法计算的沥青膜厚度有很强的线性相关性。相同骨料粒径下，沥青膜厚度随沥青掺量的增加而增加，相同沥青掺量下，沥青膜厚度随骨料粒径的减小而增加。(C) 2016 Elsevier Ltd.版权所有。
Micro-structural characteristics of recycled asphalt mixture have an important influence on its macro mechanical performance. In this study, the discreteness, RAP dosage and asphalt film thickness of hot asphalt mixtures with recycled rubber were analyzed through CT scanning together with the IPP software. The recycled asphalt pavement (RAP) content was set as 25%, and the asphalt mixture specimens were produced in the laboratory. Different kinds of hot recycled rubber asphalt mixtures were produced to calculate the film thickness of the asphalt with five different asphalt dosages, 4.2%, 4.5%, 4.8%, 5.1%, and 5.4%, and three different aggregate particle sizes. From the results, it shows that the distribution of rubberized recycled hot mix asphalts can be analyzed by CT and considered as uniform, as the average particle size of aggregate on the left side is 2458.93 mu m while the right is 2487.38 mu m. The calculation of RAP dosage by CT technology is reliable. The RAP dosage is calculated to be 23.98%, and the actual error is 4.1%, relatively small. The asphalt film thickness of the rubberized recycled hot mix asphalt obtained by CT is reliable. It has strong, linear correlation with the asphalt film thickness calculated using the Hweem method. Asphalt film thickness increases with the increase in asphalt dosage under similar aggregate particle size, and asphalt film thickness increases with the decrease in aggregate particle size-under the same asphalt dosage. (C) 2016 Elsevier Ltd. All rights reserved.