Dicalcium silicate polycrystalline (γ-CS) is characterized by the carbon dioxide reactivity which can be used as carbon neutral binders. To promote the industrial scale production of γ-CS, 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-CS was investigated. The results revealed that ZnO doping could promote the formation of γ-CS at a lower temperature but lead to a decrease in the crystal plane spacing of γ-CS, which is adverse to its carbonation properties. During the carbonization of γ-CS doped with Zn, the Zn will combine with calcite, hindering calcite crystallization and γ-CS carbonization. This work laid a solid foundation for the manufacture of γ-CS by utilizing industrial waste and optimizing its properties.

中文翻译：

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ZnO对γ-C2S熟化和碳化行为的影响

硅酸二钙多晶（γ-CS）的特点是具有二氧化碳反应活性，可用作碳中性粘合剂。为了促进γ-CS的工业规模生产，有必要评估原料中微量元素对性能的潜在影响。本研究研究了固体废物中常见的杂质ZnO对γ-CS的熟化和碳化特性的影响。结果表明，ZnO掺杂可以促进γ-CS在较低温度下的形成，但会导致γ-CS晶面间距减小，不利于其碳化性能。掺杂Zn的γ-CS在碳化过程中，Zn会与方解石结合，阻碍方解石结晶和γ-CS碳化。该工作为利用工业废料并优化其性能制备γ-CS奠定了坚实的基础。