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冬季寒冷地区路面易积雪结冰,常使用除冰盐进行融雪除冰。除冰盐的使用会对路面材料产生侵蚀。该文以沥青混凝土路面的重要组成部分——沥青砂浆为研究对象,对经历不同盐冻状况的沥青砂浆试件进行了单轴压缩蠕变试验,利用Origin软件对蠕变曲线进行非线性拟合,得到沥青砂浆的Burgers模型参数。并利用扫描电镜对试件表面进行观测。试验结果表明:经历的冻融循环次数越多,沥青砂浆抵抗轴向变形的能力越差,即抗压强度越低。融雪盐浓度越大,其弹性模量降低也越明显,沥青与骨料的接触界面受损越严重。盐冻环境对于沥青砂浆的初期弹性变形有显著影响,而对于粘性变形影响不大。
The road in winter is easy to snow and ice in the cold area, often using deicing salt for snow melting and deicing. The use of deicing salt can cause erosion of pavement materials. In this paper, asphalt mortar, an important part of asphalt concrete pavement, was used to investigate the uniaxial compressive creep tests of asphalt mortar under different salt frost conditions. Origin software was used to fit the creep curves nonlinearly The Burgers model parameters of asphalt mortar were obtained. And the use of scanning electron microscopy of the specimen surface observation. The experimental results show that the more the freeze-thaw cycles, the worse the ability of asphalt mortar to resist axial deformation, that is, the lower the compressive strength. The greater the concentration of snowmelt salt, the more obvious the decrease of elastic modulus, the more serious the interface between asphalt and aggregate is damaged. The salt frost environment has a significant impact on the initial elastic deformation of asphalt mortar, but has little effect on viscous deformation.