盐-冻融循环条件下沥青混合料水稳定性评价  

Evaluation of Asphalt Mixture Water Stability Under the Salt-Freeze-Thaw Cycles

作　　者：闫人伟 师长春 彭林魏 乔宁 褚辞 YAN Ren-wei;SHI Chang-chun;PENG Lin-wei;QIAO Ning;CHU Ci(Qinghai Guoluo Highway Engineering Construction Co.Ltd.,Qinghai 810000,China;School of Materials Science and Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]青海省果洛公路工程建设有限公司,西宁市810000 [2]长安大学材料科学与工程学院,西安市710061

出　　处：《公路》2025年第3期50-55,共6页Highway

基　　金：青海省交通运输厅科技项目,项目编号2023-07。

摘　　要：为研究盐-冻融条件下沥青混合料水稳定性劣化规律及机理,采用拉拔试验、冻融劈裂试验分别测试了盐-冻融环境中基质沥青黏附性和沥青混合料水稳定性,借助傅里叶变换红外光谱(FTIR)和扫描电子显微镜(SEM)分析了掺盐沥青胶浆的微观特性,并结合盐-冻融循环后沥青混合料的宏观形貌研究了其水稳定性的劣化机理。结果表明:随着NaCl溶液、Na_2SO_4溶液浓度和冻融循环次数的增加,沥青混合料的水稳定性劣化明显;盐分对沥青的“盐老化”效应和冻融环境导致混合料内部膨胀压力增大,是沥青混合料水稳定性劣化的主要原因。To study the degradation of water stability and mechanism of asphalt mixtures exposed to the salt-freeze-thaw conditions,the adhesion of matrix asphalt and the water stability of asphalt mixtures in salt-freeze-thawing environments are tested by pull-out test and freeze-thaw splitting test,and the microscopic characteristics of the salt-doped asphalt slurry are analyzed with the help of Fourier Transform Infrared Spectroscopy and Scanning Electron Microscop,and the water stability deterioration mechanism of the asphalt mixtures is studied in combination with the macroscopic morphology of the asphalt mixtures after salt-freezing and thawing cycles.The results show that:with the increase of the number of freeze-thaw cycles and the concentration of Na_2SO_4 solution and NaCl solution,the water stability performance of asphalt mixtures continues to decline;and the"salt aging"effect of the salt on the asphalt and the increase of expansion pressure inside the mixtures due to the freeze-thaw environments are the main reasons for the decrease in the water stability performance of asphalt mixtures.

关 键 词：道路工程 沥青混合料 盐蚀 冻融循环 水稳定性 

分 类 号：U416.217[交通运输工程—道路与铁道工程] TU528.42[建筑科学—建筑技术科学]