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Reaction kinetics of calcined smectite in a clinker-free model and a synthetic cement system in comparison with selected calcined phyllosilicates
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-12-08 , DOI: 10.1016/j.cemconres.2024.107766
Sebastian Scherb, Matthias Maier, Köberl Mathias, Nancy Beuntner, Karl-Christian Thienel

The investigations of clinker-free model and synthetic cement systems reveal deeper insight into the behavior of metasmectite during early hydration. The use of metasmectite accelerates the aluminate clinker reaction and influences the degree of hydration of alite. Its chemical reactivity can be demonstrated in clinker-free as well as model cement systems by direct quantification of the metasmectite, its portlandite consumption and C-S-H formation. The influence on sulfate balance reveals an interaction of metasmectite's negatively charged surfaces with ions from the pore solution and demonstrates that sulfate adsorption does not solely take place on surfaces of C-S-H. Overall, it can be concluded that the impediment of the alite hydration during early hydration due to metasmectite is rather insignificant compared to metakaolinite and is within the range of metaillite. These findings provide a significant contribution to the expected widespread use of calcined clays with a low metakaolinite content in cementitious systems.

中文翻译:


无熟料模型和合成水泥系统中煅烧蒙脱石与选定的煅烧层状硅酸盐的反应动力学比较



对无熟料模型和合成水泥系统的研究揭示了对变晶石在早期水化过程中的行为的更深入见解。使用偏晶石会加速铝酸盐熟料反应并影响铝酸盐的水化程度。通过直接定量变长泥石、硅酸盐消耗和 C-S-H 形成,可以在无熟料和模型水泥系统中证明其化学反应性。对硫酸盐平衡的影响揭示了变蓄石带负电荷的表面与孔隙溶液中离子的相互作用,并表明硫酸盐吸附不仅仅发生在 CSH 表面。总体而言,可以得出结论,与偏高岭石相比,变云石在早期水化过程中对铝石水化的阻碍相当微不足道,并且在辉石的范围内。这些发现为预期在胶凝系统中广泛使用低偏高岭石含量的煅烧粘土做出了重大贡献。
更新日期:2024-12-08
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