Effect of MgO content on the quantitative role of hydrotalcite-like phase in a cement-slag system during carbonation

This paper reports the carbonation characteristics of a cement-slag system exposed to accelerated testing, and its improved resistance with increasing MgO content in blast furnace slag, which hydrotalcite-like phase plays key role. Our research showed that started carbonate upon contacting ions bound more than 15 wt% CO2−3 mildly carbonated transition areas. value was positively associated magnesia slag. Additionally, proportion shared by decreased fully area, CO2 fixed form calcium carbonate. Consistent thermodynamic modelling, ratio total CaCO3 continued decrease as ingress progressed. On other hand, reaction between found be volumetrically stable due binding interlayer space, Mg still distributed within original slag grain region. Mg/Al atomic remained nearly same before after carbonation. Results this study quantitatively emphasized favorable effect improve slag-rich cementitious systems.