Hydration and phase evolution of blended cement composites containing lithium and saturated metakaolin
Hydration and phase evolution of blended cement composites containing lithium and saturated metakaolin
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DOI：
10.1016/j.cemconcomp.2023.105268
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发表时间：
2023-08
影响因子：
10.5
通讯作者：
Dayou Luo;Jianqiang Wei
中科院分区：
文献类型：
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作者：
Dayou Luo;Jianqiang Wei
虽然偶联锂和饱和偏高岭土在碱-硅反应减缓中的高效率已被证实，但其对水泥水化的影响仍未被研究。在本研究中，研究了不同饱和度的饱和偏高岭土及其与锂的联合作用对水泥复合材料水化动力学、相演化、水化产物微观结构和分子结构发展的影响。实验和热力学模拟结果表明，饱和偏高岭土与锂在增强水泥水化、偏高岭土与水泥相互作用、铝在硅酸盐链中的掺入以及富铝相的析出等方面具有协同作用。在混合水泥基体中，偏高岭土的溶解、掺入铝（C-(A)- s - h）的硅酸钙水合物的形成和strätlingite的沉淀分别提高了19.6%、17.6%和20.0%，并引发了立方硅质水榴石的形成。
Although the high efficiency of coupled lithium and saturated metakaolin in alkali-silica reaction mitigation has been documented, its influence on cement hydration remains uninvestigated. In this study, saturated metakaolin with varying degrees of saturation and its combined influence with lithium on the hydration kinetics, phase evolution, and development of microstructure and molecular structures of hydration products in the blended cement composite was investigated. The experimental and thermodynamic modeling results indicate the synergistic effect between saturated metakaolin and lithium in enhancing the hydration of cement, interaction between metakaolin and cement, incorporation of Al in the silicate chains, and precipitations of Al-rich phases. In the blended cement matrix, the dissolution of metakaolin, formation of calcium silicate hydrates with incorporated aluminum (C-(A)-S-H), and precipitation of strätlingite are improved by 19.6%, 17.6%, and 20.0%, respectively, and the formation of cubic siliceous hydrogarnet was triggered.