Using long-term natural immersion method to improve the damage of concrete in MgSO4 and MgSO4+NaCl solutions.Conduct research to observe the failure mode of concrete in erosion solution,and measure the relative dynamic elastic modulus and quality changes of concrete at different erosion ages.The results show that the failure mode of concrete under Mg2++SO42-erosion is powdering,corrosion pits,and other phenomena,and the presence of Cl-weakens the failure phenomenon on the concrete surface;The presence of NaCl does not alter the variation pattern of magnesium sulfate corrosion on concrete,but the presence of chloride salts slows down the corrosion of magnesium sulfate solution on concrete,and the weakening effect becomes more pronounced with the increase of chloride salt concentration;Under the action of Mg2++SO42-+Cl-composite solution,the quality of concrete shows a slow initial change and a rapid increasing trend in the later stage.In addition,the presence of Cl-in the early stage of erosion prolongs the time of concrete surface damage and improves the ability of concrete to resist salt solution erosion.
concretemagnesium sulfatechloridesdamagequality changesrelative dynamic modulus of elasticity
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