Experimental Study on Strength Development Pattern of Magnesium Oxychloride Cement Cured in Chloride Solution

Based on different molar ratio of MgO/MgCl2, H2O/MgCl2, magnesium oxychloride cement (MOC) paste was prepared, and soaked in chloride solutions of different concentration. The compressive strength of different age was measured and the component and microstructure of the hydrate was tested by X-ray diffraction (XRD) and scanning electron microscopy (SEM) to investigate the hydration characteristics of MOC soaked in chloride solutions of different concentration (10%, 20%, saturated, super-saturated). The results showed that the MOC paste specimen could hydrate, harden, develop and keep strength in saturated chloride solution, but the strength can not maintain in chloride solution of low concentrations; it is found that MOC could hydrate, harden, develop and keep strength in particular chloride solution owing to the formation, development and stabilization of 518.