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首页> 外文期刊>RSC Advances >Microstructure and characterization of aluminum-incorporated calcium silicate hydrates (C–S–H) under hydrothermal conditions
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Microstructure and characterization of aluminum-incorporated calcium silicate hydrates (C–S–H) under hydrothermal conditions

机译：水热条件下掺铝的硅酸钙水合物（C–S–H）的微观结构和表征

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摘要

The phase assembly and microstructure of the aluminum-incorporated CaO–SiO _(2) –H _(2) O system, which is technologically important in autoclaved building materials, catalysis and waste management, were investigated using XRD, SEM, FTIR and NMR depending on aluminum addition, reaction temperature and curing time. The content of each phase was obtained using the MAUD program based on the Rietveld refinement. The results revealed that the formation of the tobermorite phase was promoted at Al/(Al + Si) ≤ 0.03, and subsequently retarded by higher aluminum addition, which was corroborated by the presence of more low polymerized and cross-linked (alumino)silicate chains. The phase purity decreased with increasing aluminum addition. Aluminum changed the morphology of tobermorite from plate-like to lath-like and fibrous. About a quarter of the (alumino)silicate chains in the C–S–H structure were linked though a Si–O–Al configuration, and this proportion was almost independent of aluminum addition. Furthermore, only Al[4] substituted for silicon in the aluminum incorporated C–S–H, while Al[6] just exited in the hydrogarnet phase. This work is beneficial for understanding the implication on micro-properties of by-products or admixtures containing aluminum in concrete.
机译：使用XRD，SEM，FTIR和NMR研究了铝结合的CaO–SiO _（2）–H _（2）O系统的相组装和微观结构，该系统在高压灭菌的建筑材料，催化和废物管理中具有重要的技术意义。取决于铝的添加，反应温度和固化时间。使用基于Rietveld改进的MAUD程序获得每个阶段的内容。结果表明，在Al /（Al + Si）≤0.03时，促进了钙铁矿相的形成，并随后因较高的铝添加量而受到阻碍，铝的存在被低聚合和交联的（铝）硅酸盐链证实了这一点。 。相纯度随着铝添加量的增加而降低。铝将水辉石的形态从板状变为板条状和纤维状。 C–S–H结构中大约四分之一的（铝）硅酸盐链通过Si–O–Al构型连接，并且该比例几乎与铝的添加无关。此外，在铝结合的C–S–H中，只有Al [4]代替了硅，而Al [6]刚好在水石榴石相中存在。这项工作有助于理解混凝土中含铝副产物或掺合料对微观性能的影响。

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