The role of hydrotalcite-like phase and monosulfate in slag cement paste during atmospheric and accelerated carbonation

This paper identified carbonation products in the slag-rich cementitious systems upon three different exposure conditions, namely, long term field, indoor natural exposure, and accelerated testing. Overall, mineralogy of was found to be fundamentally similar under environments. In fully carbonated areas, no monosulfate calcium hydroxide observed, carbonate, hydrotalcite-like phase Ca–Al AFm phases were as main carbonate phases. mildly clusters detected again. With continuous supply CO2, appeared consumed at first. Despite environments, bound around 5% CO2 penetrated into matrix. Hydrotalcite-like able absorb more than 15% initially. However, this value decreased 10% areas. Therefore, 20% entered well first, involved reactions harmless without any detrimental effect on cement Meanwhile, keep intact its Mg/Al atomic ratio did not vary significantly during carbonation.