This study investigates the effect of in-situ generated calcium carbonate by CO mixing on the reaction of calcined clay and demonstrates that the in-situ generated calcium carbonate remarkably accelerates the reaction of calcined clay. The mechanism is revealed through the application of multiple techniques and thermodynamical modeling. The in-situ generated calcium carbonates are generally nano/micro-particles and provide the seeding effect for promoting the formation of reaction product. More importantly, it is found that in-situ generated calcium carbonates are highly reactive and could react with metakaolin from calcined clay to form carboaluminate, while prohibits the formation of stratlingite. Therefore, this study unveils the synergistic effect of in-situ generated calcium carbonate in promoting the reaction of calcined clay, indicating that CO mixing is a promising technique in promoting the performance of calcined clay based cementitious materials.

中文翻译：

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揭示二氧化碳混合原位生成碳酸钙对煅烧粘土反应的协同效应

本研究研究了通过CO混合原位生成的碳酸钙对煅烧粘土反应的影响，并证明原位生成的碳酸钙显着加速了煅烧粘土的反应。通过多种技术和热力学模型的应用揭示了该机制。原位生成的碳酸钙通常是纳米/微米颗粒，并提供促进反应产物形成的晶种效应。更重要的是，发现原位生成的碳酸钙具有高反应性，可以与煅烧粘土中的偏高岭土反应形成碳铝酸盐，同时抑制层岭石的形成。因此，本研究揭示了原位生成的碳酸钙在促进煅烧粘土反应中的协同效应，表明CO混合是提高煅烧粘土基胶凝材料性能的一项有前景的技术。