Li Bo, Zhou Jianing, Zhang Zhihao, Yang Xiaolong, Wu Yu
National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China.
Research and Development Centre of Transport Industry of Technologies, Materials and Equipment of Highway Construction and Maintenance, Gansu Road and Bridge Group Co., Ltd., Lanzhou 730070, China.
Materials (Basel). 2019 Mar 29;12(7):1039. doi: 10.3390/ma12071039.
Effective approaches are required to be developed to solve the poor compatibility and thermal stability problems of crumb rubber-modified asphalt (CRMA). This study focuses on a method called microwave activation. However, seldom researches pay attention to the properties of MACRMA after aging. The objective of this study was to prepare microwave-activated CRMA (MACRMA) and investigate the performance of asphalt after aging. The samples were subjected to thin-film oven test (TFOT) at different times and temperatures. The effect of heat aging on the properties of MACRMA was evaluated by three indicator tests: viscosity, dynamic shear rheology test (DSR), and repeat creep recovery test (RCRT). The test results indicated that the MACRMA after two aging conditions had noticeably lower performance values (e.g., penetration, ductility) compared to unaged samples, and thus, the need to control temperature and time for mixing and construction was verified to be important. In addition, the */sin δ and phase angle values were largely influenced by the TFOT aging temperature and time. The MACRMA's ability to recover was improved after aging. Compared with the aging temperature, the aging time had a more significant effect on the deformation and recovery ability of MACRMA.
需要开发有效的方法来解决橡胶粉改性沥青（CRMA）相容性差和热稳定性问题。本研究聚焦于一种名为微波活化的方法。然而，很少有研究关注微波活化橡胶粉改性沥青（MACRMA）老化后的性能。本研究的目的是制备微波活化橡胶粉改性沥青（MACRMA）并研究老化后沥青的性能。对样品在不同时间和温度下进行薄膜烘箱试验（TFOT）。通过三项指标试验评估热老化对MACRMA性能的影响：粘度、动态剪切流变试验（DSR）和重复蠕变恢复试验（RCRT）。试验结果表明，与未老化样品相比，经过两种老化条件后的MACRMA性能值（如针入度、延度）明显较低，因此，验证了控制混合和施工温度及时间的重要性。此外， */sin δ和相位角值受TFOT老化温度和时间的影响很大。老化后MACRMA的恢复能力有所提高。与老化温度相比，老化时间对MACRMA的变形和恢复能力影响更显著。
