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为研究SMA混合料的冻融循环性能,通过对SMA-13进行多次冻融循环试验,分析SMA混合料在经历不同冻融循环次数后其水稳定性、高温稳定性、渗水性能的变化规律,提出将水泥和消石灰作为外加剂替代部分矿粉来改善SMA混合料冻融循环性能的方法,并采用超声波法测试其冻融循环性能的变化规律。结果表明:掺加20%消石灰(质量分数)可显著提高SMA混合料的冻融循环性能;超声波法测试SMA混合料冻融循环性能时,受孔隙率影响较大;提出的修正方法可显著提高超声波法评价SMA混合料冻融循环性能的准确性。
In order to study the freeze-thaw cycle performance of SMA mixture, SMA-13 was subjected to repeated freeze-thaw cycles to analyze the changes of water stability, high temperature stability and water seepage performance of SMA mixture under different freeze-thaw cycles , Proposed cement and lime as an additive to replace part of the slag to improve the SMA mixture freeze-thaw cycle performance of the method, and the use of ultrasonic testing of its freeze-thaw cycle performance changes. The results show that the addition of 20% slaked lime can significantly improve the freeze-thaw cycle performance of SMA composites. When the ultrasonic freeze-thaw cycles of SMA mixture is tested, the influence of porosity is significant. The proposed correction method can be significantly improved Evaluation of the Accuracy of the SMA Mixture Freeze-Thaw Cycle by Ultrasonic Method.