SMA混合料冻融循环性能试验及超声波法评价  

Test on Characteristics of SMA Mixtures Under Freeze-thaw Cycle and Ultrasonic Evaluation Method

作　　者：颜可珍[1] 游凌云[1] 王晓亮[1] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082

出　　处：《中国公路学报》2015年第11期8-14,共7页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(50808077;51278188);中央高校基本科研业务费专项资金项目;湖南省普通高校青年骨干教师培养计划项目

摘　　要：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。To analyze SMA mixture characteristics under freeze-thaw cycle,the change laws of water stability,high temperature stability and permeability of SMA-13 mixtures were analyzed after several freeze-thaw cycles. A solution was proposed to improve the SMA mixture characteristics of freeze-thaw cycles by replacing mineral powder with cement and lime in the mixtures,and change laws of SMA mixture characteristics of freeze-thaw cycle were measured by using ultrasonic method.The results show that adding 20% of hydrated lime（mass fraction）has a significant effect on the improvement of SMA mixture characteristics of freeze-thaw cycles.When ultrasonic method is used to test SMA mixture characteristics of freeze-thaw cycle,it is largely affected by the air void ratio of SMA.The proposed revised method can significantly improve the accuracy of ultrasonic evaluation method.

关 键 词：道路工程 SMA混合料 超声波法 冻融循环 水稳定性 高温稳定性 渗水性能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]