To solve the problem of asphalt concrete panel cracking at low temperatures, this study proposes to use crumb rubber as a modified material for asphalt in the impermeable layer of asphalt concrete panels and to investigate the anti-cracking performance of crumb rubber modified asphalt concrete (CRMAC) in water conservancy projects in different low-temperature environments. Taking matrix asphalt concrete (MAC), CRMAC, and SBS modified asphalt concrete (SBSMAC) as the research objects, the cracking resistance performance of the three kinds of asphalt concrete under different low-temperature conditions were comparatively analyzed by using ultra-low-temperature (−35°C) small beam bending test, which reveals the damage mechanism of asphalt concrete's low-temperature cracking and damage process; the failure temperatures of the three kinds of asphalt concrete were accurately quantified by the thermal stress restrained specimen test (TSRST), and combined with the Pearson correlation coefficient method to determine the evaluation criteria of asphalt concrete low-temperature performance. The results show that the low-temperature crack resistance of CRMAC is better than the other two asphalt concretes under the same temperature conditions. Its failure temperature reaches −43°C, which meets the low-temperature demand for asphalt concrete panels in alpine regions. This study aims to improve the low-temperature cracking resistance of asphalt concrete impermeable panels, provide new ideas for the selection of asphalt concrete panels, and lay the foundation for the application of CRMA in water conservancy projects, and open up new ways to solve the problem of waste tire accumulation.

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高寒地区水工沥青混凝土板材料选择及低温抗裂机理研究

针对沥青混凝土面板低温开裂问题，本研究提出在沥青混凝土面板防渗层中使用胶粉作为沥青改性材料，并研究胶粉改性沥青混凝土（CRMAC）的抗裂性能。 ）在不同低温环境的水利工程中。以基质沥青混凝土（MAC）、CRMAC和SBS改性沥青混凝土（SBSMAC）为研究对象，采用超低温试验方法，对比分析3种沥青混凝土在不同低温条件下的抗裂性能。 （−35℃）小梁弯曲试验，揭示沥青混凝土低温开裂和破坏过程的损伤机理；通过热应力约束试件试验（TSRST）准确量化了三种沥青混凝土的破坏温度，并结合皮尔逊相关系数法确定了沥青混凝土低温性能的评价标准。结果表明，在相同温度条件下，CRMAC的低温抗裂性能优于其他两种沥青混凝土。其破坏温度达到-43℃，满足高寒地区沥青混凝土板的低温需求。本研究旨在提高沥青混凝土防渗板的低温抗裂性能，为沥青混凝土板的选型提供新思路，为CRMA在水利工程中的应用奠定基础，为解决沥青混凝土防渗板低温开裂问题开辟新途径。废旧轮胎堆积问题。