Yang Guang, Wang Xudong, Zhou Xingye, Wang Yanzhu
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China.
Research Institute of Highway Ministry of Transport, Beijing 100088, China.
Materials (Basel). 2020 Jan 19;13(2):474. doi: 10.3390/ma13020474.
Asphalt mixtures used in stress absorbing membrane interlayers (SAMIs) play a significant role in improving the performance of asphalt pavement. To investigate the rheological properties and phase transition characteristics of asphalt mixtures used in SAMI with temperature changes, twenty-seven candidate mixtures with different binders, gradation types and binder contents were selected in this research. During the study, dynamic mechanical analysis method was employed to evaluate their temperature-dependent properties and a series of wide-range temperature sweep tests were conducted under a sinusoidal loading. Some critical points and key indexes from the testing curves such as glass transition temperature (Tg) can be obtained. Test results show that phase transition characteristics can better reflect the rheological properties of asphalt mixtures at different temperatures. Crumb rubber modified asphalt mixtures (AR) provide a better performance at both high and low temperatures. Additionally, the range of AR asphalt mixtures' effective functioning temperature ΔT is wider, and the slope K value is greater than the others, which indicates that AR asphalt mixtures are less sensitive to temperature changes. Additionally, gradation type and asphalt content also influence the properties: finer gradation and more asphalt content have a good effect on the low-temperature performance of the asphalt mixtures; while mixtures with a coarser gradation and less asphalt content perform better at high temperature and they are less sensitive to temperature changes. Finally, AR asphalt mixture is more suitable to be applied in the SAMI due to its phase transition characteristics from this method.
应力吸收中间层（SAMI）中使用的沥青混合料在改善沥青路面性能方面发挥着重要作用。为了研究SAMI中使用的沥青混合料随温度变化的流变性能和相变特性，本研究选择了27种具有不同粘结剂、级配类型和粘结剂含量的候选混合料。在研究过程中，采用动态力学分析方法评估其温度依赖性性能，并在正弦荷载作用下进行了一系列宽温度范围的扫描试验。可以从测试曲线中获得一些临界点和关键指标，如玻璃化转变温度（Tg）。试验结果表明，相变特性能够更好地反映沥青混合料在不同温度下的流变性能。橡胶粉改性沥青混合料（AR）在高温和低温下均具有较好的性能。此外，AR沥青混合料的有效作用温度范围ΔT更宽，斜率K值大于其他混合料，这表明AR沥青混合料对温度变化不太敏感。此外，级配类型和沥青含量也会影响性能：较细的级配和较多的沥青含量对沥青混合料的低温性能有良好影响；而级配较粗、沥青含量较少的混合料在高温下性能较好，且对温度变化不太敏感。最后，从该方法的相变特性来看，AR沥青混合料更适合应用于SAMI。
