Unidirectional chloride salt erosion test and mechanism study of rock-HDSC assemblage under dry-wet cycle mechanism
High ductility shotcrete(HDSC)is a new type of engineering gel composite material,which is used for the repair of tunnels and mines.The dry-wet cycle test of rock-HDSC combination was carried out for 200 days with 10%(by mass)fraction of chloride salt solution as the erosion medium,and the unidirectional erosion mechanism of chloride ion on rock-HDSC combination under dry-wet cycle conditions was explored.The test results show that due to the binding effect of chloride ions and the filling effect of Friedel salt and chloride crystal on the internal pores of the combination,the damage degree of the combination increases with the increase of the number of cycles,and the time of internal damage will move forward with the increase of the number of cycles.The elastic energy of the combination under uniaxial compression is negatively correlated with the proportion of dissipated energy.The growth rate of chloride corrosion depth is greatly affected by fiber in the later stage,and the fiber has certain resistance to chloride ion erosion.
erosion mechanismenergy evolutionstress-strain curveerosion depthfailure modeFriedel salt
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