Ran Wuping, Zhang Yu, Li Ling, Shen Xizhong, Zhu Hailin, Zhang Yongbo
School of Civil Engineering &Architecture, Xinjiang University, Urumqi 830047, China.
Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission, Shunhe Road No. 45, Zhengzhou 450003, China.
Materials (Basel). 2019 Sep 20;12(19):3055. doi: 10.3390/ma12193055.
The contact state between layers of asphalt pavement not only has a significant effect on the mechanical response of road structure but is also the bottleneck of research on the mechanical behavior of pavement structure at present. In this paper, the effects and laws of different water-salt entry modes, salt solution concentrations, and temperatures coupling on the contact state between base and surface layers are studied by a 45° inclined shear test. The simulation and verification of each working condition are carried out by ABAQUS (Dassault, Paris, France) the friction coefficient between layers is reversed, and the actual contact state between layers is characterized in order to realize comprehensive evaluation and reasonable expression. The results show that different modes have different effects on contact characteristics. At the same temperature and concentration of the salt solution, bonding of water and salt erosion is the best, followed by direct erosion, with the worst being from bottom to top, and the interlayer bonding condition is weakened with increase in temperature. The relative accuracy of the software simulation and test analysis was as high as 92% and the friction coefficient of the water-free salt erosion test piece was found to be about 0.85 at 25 °C, while after the bottom-up erosion of the 14% salt solution the friction coefficient was found to be about 0.43, which indicates that the corrosion of the water-salt will have a great effect on the bonding condition between the structural layers of the road.
沥青路面层间接触状态不仅对道路结构的力学响应有显著影响，也是目前路面结构力学行为研究的瓶颈。本文通过45°斜剪试验，研究了不同水盐侵入模式、盐溶液浓度和温度耦合对基层与面层间接触状态的影响及规律。利用ABAQUS（法国达索公司，巴黎）对各工况进行模拟与验证，反演层间摩擦系数，表征层间实际接触状态，以实现综合评价与合理表达。结果表明，不同模式对接触特性影响不同。在相同温度和盐溶液浓度下，水盐侵蚀结合作用最佳，其次是直接侵蚀，自下而上侵蚀最差，且层间结合状况随温度升高而减弱。软件模拟与试验分析的相对精度高达92%，发现25℃时无盐水侵蚀试件的摩擦系数约为0.85，而14%盐溶液自下而上侵蚀后摩擦系数约为0.43，这表明水盐侵蚀对道路结构层间结合状况有很大影响。
