The Salt Attack Performance of Magnesium Oxychloride Cement Exposure to Three Kinds of Brines

Salt attack performance of magnesium oxychloride cement (MOC) in brine was investigated from the viewpoints of strength development and strength coefficient. Microstructure was studied using quantitative X-ray diffraction (QXRD), thermogravimetry (TG) and scanning electron microscopy (SEM). The results show that MOC mortars have outstanding salt attack performance after aging brine and raw brine immersion. The salt attack coefficients of MOC mortars are higher than 0.8, which is qualified for application in saline soil and salt lake area. The reason is that salt brine solution enters into the voids of MOC and plays a role of toughening and strengthening in the MOC.