Analysis of Mechanism of Resistance to Chloride Ion Erosion of Sulphoaluminate Cement Concrete

For measuring chloride diffusion coefficient of Portland cement concrete and sulphoaluminate cement -based concrete,the method of chloride migration coefficient from non-steady-state experiments is adopted. And their cement hydration products and internal structure were researched by the application of X-ray diffraction analysis(XRD) and scanning electron microscopy analysis(SEM).According to the above studies,the resistance to chloride ion erosion of sulphoaluminate cement and the resistance mechanism of the cement were analyzed.The results show that sulphoaluminate cement is an ideal cementitious material which can significantly improve the resistance to chloride ion erosion of the concrete.At the same time, the performance of the cement is gradually improved with the lower water-cement ratio.