Research on the Water Stability of OGFC under the Coupled Effect of Freeze-Thaw and Salt Corrosion
In order to study the freeze-thaw salt corrosion problem of permeable asphalt pavement in the northern seasonal region caused by the use of snow melt salt,the macroscopic and simulated splitting tests on OGFC asphalt mixture are carried out under the coupling effect of freeze-thaw and salt corrosion.Uniaxial compression and creep tests are conducted on asphalt mortar after salt freezing cycles,and a Burgers damage model containing damage factors is established.By using industrial CT tomography technology,a three-dimensional model of heterogeneity characteristics at the micro level of OGFC asphalt mixture is established,and simulation splitting tests are conducted.The test results are compared and analyzed with macroscopic splitting test results.The results indicate that the salt freezing cycle has an adverse effect on the water stability of OGFC asphalt mixture,and the interface between the voids and aggregates of the mixture is prone to stress concentration,resulting in a decrease in overall bearing capacity.The error between the macroscopic and simulated splitting test results is about 20%,but the trend of splitting strength change is basically consistent.
OGFCfreezing and thawing salt corrosionwater stabilitysimulation of freeze-thaw splittingCT tomography
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维普
