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Effects of CO2 and temperature on the structure and chemistry of C–(A–)S–H investigated by Raman spectroscopy

机译:拉曼光谱研究CO 2 和温度对C–(A–)S–H结构和化学的影响

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Calcium (alumino)silicate hydrate (C–(A–)S–H) is the critical binding phase in modern Portland cement-based concrete, yet the relationship between its structure and stoichiometry is not completely understood. In this study, Raman spectroscopy is used to analyze the effects of varying Ca/Si molar ratio (0.6–1.6), Al/Si molar ratio (0.0–0.1), and synthesis temperature (7–80 °C) on the chemical composition and atomic configuration of C–(A–)S–H. The experimental results indicate that increasing Ca/Si molar ratio produces less cross-linked C–(A–)S–H structures, while the addition of Al into the system increases the long-range order of its chain-like structure. Furthermore, increasing the synthesis temperature leads to the formation of more polymerized structures, especially in the Al-containing samples. The Raman spectra also suggest the formation of vaterite in C–S–H samples synthesized at low temperatures. Finally, this study reveals that uptake of atmospheric CO2 in C–S–H and C–A–S–H favors the formation of long-range ordered chain-like structures.
机译:水合(铝)硅酸钙(C–(A–)S–H)是现代波特兰水泥基混凝土的关键粘结相,但其结构与化学计量之间的关系尚不完全清楚。在这项研究中,拉曼光谱用于分析不同的Ca / Si摩尔比(0.6–1.6),Al / Si摩尔比(0.0–0.1)和合成温度(7–80°C)对化学成分的影响和C–(A–)S–H的原子构型。实验结果表明,增加Ca / Si摩尔比会产生较少的交联C–(A–)S–H结构,而向系统中添加Al会增加其链状结构的长程顺序。此外,提高合成温度导致形成更多聚合的结构,尤其是在含铝样品中。拉曼光谱还表明低温合成的C–H–H样品中球samples石的形成。最后,这项研究表明,在C–S–H和C–A–S–H中吸收大气CO 2 有利于长程有序链状的形成。结构。

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