Accelerated carbonation of carbonatable clinkers into building products is an effective way of CO utilization. However, due to insufficient understanding on the phase characteristics of carbonatable clinkers, there is still a lack of guidance on the selection and design of carbonatable clinkers. In this study, three γ-CS based carbonatable clinkers were designed and synthesized, covering the carbonation active phase, the unavoidable CAS and amorphous glass phases when using industrial feedstocks. The differences in the carbonation activity, mechanical properties and microstructure were compared. Results show that the uncarbonated phases have a significant impact on the mechanical properties of carbonated matrix. The presence of unreacted γ-CS with self-pulverization induced cleavage planes and the amorphous glass phase with poor binding to the adjacent calcium carbonate crystals leads to reduced compressive strength. The carbonation reactivity of γ-CS formed in composite system is significantly higher than that of pure γ-CS. Benefiting from the higher degree of carbonation, carbonatable clinkers only need to contain >40 wt% of γ-CS to obtain comparable compressive strength as the pure γ-CS system.

中文翻译：

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了解不同相在 γ-C2S 基碳酸熟料中的作用


将可碳化熟料加速碳化成建筑产品是二氧化碳利用的有效途径。但由于对碳酸熟料的物相特征认识不够，对碳酸熟料的选择和设计仍缺乏指导。本研究设计并合成了三种γ-CS基可碳酸化熟料，涵盖工业原料时的碳酸化活性相、不可避免的CAS和无定形玻璃相。比较了碳化活性、力学性能和微观结构的差异。结果表明，非碳化相对碳化基体的力学性能有显着影响。具有自粉碎诱导解理面的未反应的 γ-CS 的存在以及与相邻碳酸钙晶体结合不良的无定形玻璃相导致抗压强度降低。复合体系中形成的γ-CS的碳酸化反应活性明显高于纯γ-CS。受益于较高的碳化程度，可碳化熟料仅需要含有>40 wt%的γ-CS即可获得与纯γ-CS体系相当的抗压强度。