Effect of Ca2+ and Na+ on the curing performance of chloride ions in cement under carbonization

By using XRD diffraction patterns and SEM scanning electron microscopy, the study included exploring the effects of carbonation on the types of cations, namely Na+ and Mg2+, on the chloride concentration and mechanism, which is an important factor that has received little attention. The results show that carbonization has a greater negative impact on the binding capacity of chloride ions in cement mixed with NaCl, and CaCl2 can weaken the negative effect of carbonization on the binding capacity of chloride ions and improve the binding capacity of free chloride ion ;During the carbonization of cement mixed with NaCl, the chloride content corresponding to the maximum chloride ion binding rate was reduced from 0.9 % to 0.8 %, while the value was 0.8 % in cement mixed with CaCl2;Carbonization can improve the structure of the cement and reduce the porosity in the cement structure.