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水化硅酸钙(C-S-H)凝胶是硅酸盐水泥的主要水化产物,是水泥胶凝能力的主要来源。C-S-H凝胶的纳米结构由长程无序、短程有序的类Tobermorite纳米晶组成。明确类Tobermorite相纳米晶的分子结构、氢键等分子间作用力组成及性质、H2O和羟基基团与硅氧主链的相互作用机理对理解C-S-H凝胶的胶凝能力形成机理、调控水化产物的胶凝能力具有重要意义。本文在总结固体核磁共振分析技术研究C-S-H凝胶硅氧主链结构研究进展的基础上,提出其钙硅比对硅氧主链聚合度和平均链长的影响规律,并运用固体核磁测试与第一性原理计算核磁结果相结合的研究方法,揭示了C-S-H凝胶分子结构中氢键的组成及性质,明确了水分子及羟基基团与硅氧主链的相互作用机理。
Abstract：Calcium silicate hydrate(C-S-H) gel is the main component of cement hydration products that determines the cohesive ability of cementitious materials. The nanostructure of C-S-H gel consists of tobermorite-like nanocrystals with a poor long and a short range order. Recent research development deals with the molecular structure of tobermorite-like nanocrystals, the composition and properties of molecular interactions such as hydrogen bonds, and the interaction mechanisms between H2 O and hydroxyl groups with silicate moieties are for improving the cohesive ability of C-S-H gels and developing new hydration products with high cementitious performance. In this review, some studies on the structure of main silicate chain of C-S-H gel by solid-state nuclear magnetic resonance(NMR) were reviewed, and the effect of Ca/Si ratio on the polymerization degree and mean chain length of main silicate chain was summarized. Moreover, the research methods combining solid-state NMR measurement with first-principles calculation for NMR results were represented, and the composition and properties of hydrogen bonds in the molecular structure of C-S-H gel and the interaction mechanisms between H2 O and hydroxyl groups with main silicate chain were revealed.
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基本信息:
DOI：10.14062/j.issn.0454-5648.2019.08.10
中图分类号:TQ427.26
引用信息:
[1]李博,陈伟.C-S-H凝胶分子结构研究进展[J].硅酸盐学报,2019,47(08):1095-1100.DOI:10.14062/j.issn.0454-5648.2019.08.10.
基金信息:
国家自然科学基金(51672199);; 中央高校基本科研业务费(2017-YB-008)资助项目
2019-04-14
2019
2019-06-23
2019-06-21
2019
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2019-06-21
2019-06-21
2019-06-21