Effect of ZnO on the clinkerization and carbonation behavior of γ-C2S

Abstract

Dicalcium silicate polycrystalline (γ-C2S) is characterized by the carbon dioxide reactivity which can be used as carbon neutral binders. To promote the industrial scale production of γ-C2S, it is necessary to evaluate the potential effect of minor elements in the raw materials on the performance. In this study, the impact of ZnO, a common impurity in solid wastes, on the clinkerization and carbonation characteristics of γ-C2S was investigated. The results revealed that ZnO doping could promote the formation of γ-C2S at a lower temperature but lead to a decrease in the crystal plane spacing of γ-C2S, which is adverse to its carbonation properties. During the carbonization of γ-C2S doped with Zn, the Zn will combine with calcite, hindering calcite crystallization and γ-C2S carbonization. This work laid a solid foundation for the manufacture of γ-C2S by utilizing industrial waste and optimizing its properties.