Study on Corrosion Resistant Performance of Sulfoaluminate Cement

摘要

In the salt lake areas in China, the ordinary cement concrete can be corroded by the salt in the saline soil seriously, and the application of ordinary portland cement concrete in this area is impeded. Therfore, some new cementitious materials which has high durability should be searched in order to be used in the underground engineering in saline soil areas. In this study, the sulfoaluminate cement is immersed into the salt solution that has high concentration Mg~(2+), Cl~-, (SO_4)~(2-), and the complex solution of them. The corrosion resistance performance of sulfoaluminate cement against high concentration salt solution is tested. The results indicate that Sulfoaluminate cement has perfect durability against sulfate corrosion whose concentration is in the scope of this test. Sulfoaluminate cement can not be corroded by MgCl_2 solution when MgCl_2 solution concentration is lower than degree; but when the concentration of MgCl_2 solution reaches degree, MgCl_2 solution could corrode the sulfoaluminate cement seriously. The corrosion of the specimens immersed in MgCl_2 solution whose concentration is degree is caused by the composite action of Mg~(2+) and Cl~-.