真空密封法测定沥青混合料空隙率试验研究  

Experimental Study on Vacuum Sealing Method for Measuring Void Content of Asphalt Mixture

作　　者：叶奋[1] 刘嘉辉 吴怀睿 YE Fen;LIU Jiahui;WU Huairui

机构地区：[1]新疆大学建筑工程学院,新疆乌鲁木齐830047 [2]同济大学交通运输工程学院,上海201804

出　　处：《上海公路》2023年第3期141-145,M0007,共6页Shanghai Highways

摘　　要：选择AC-20、SMA-13两种沥青混合料,采用真空密封法,测定不同击实次数成型试件的空隙率,并与表干法、体积法的测定结果进行对比分析。对试件重复测试3次,研究真空密封法重复试验的误差。通过改变密封试件的真空密封状态、密封袋材质及厚度,研究影响真空密封法测定沥青混合料空隙率的因素。结果表明:真空密封法测定值介于表干法与体积法之间,与两者的关联性较好;其多次测量空隙率的平均误差为0.19%;真空密封状态、密封袋材质和厚度对试验结果均有影响,密封状态越好,测定的空隙率误差越小;柔韧性越好、强度越高的密封袋,测定的空隙率误差越小;密封袋厚度越小,测定的空隙率误差越小。Select two types of asphalt mixtures(AC-20 and SMA-13)as specimens,and measuring the porosity of formed specimens with different compaction times by the vacuum sealing method,and the results were compared and analyzed with the surface dry method and volume method.The test was repeated three times on the specimens to study the error of the repeated test of the vacuum sealing method.By changing the vacuum sealing state of the sealed specimen,the material and thickness of the sealing bag,the factors affecting the determination of asphalt mixture porosity by using the vacuum sealing method are studied.The results show that the measured values of the vacuum sealing method are between the surface dry method and the volumetric method,and there is a good correlation between them;The average error of multiple measurements of porosity is 0.19%;The vacuum sealing state,sealing bag material,and thickness have an impact on the test results.The better the sealing state,the smaller the error in the measured porosity;The better flexibility and strength of sealed bag,the smaller the error;The smaller the thickness of the sealed bag,the smaller the error.

关 键 词：真空密封法 空隙率 沥青混合料 表干法 体积法 

分 类 号：U414[交通运输工程—道路与铁道工程]