Abstract Impregnation treatments are one of the alternatives to protect concrete-based building and monuments from weathering degradation. However, it is important to consider the chemical compatibility of the reaction products with the building material. The impregnation product studied here consists of a silica oligomer able to polymerize, by a simple sol-gel process, inside the pore structure of concrete. In this work, we investigate the ability of this impregnation treatment to produce C-S-H gel in contact with cement paste. A complete characterization of the reaction products demonstrated that the silanol groups from silica oligomers react with the portlandite present in the cement paste generating a material with the chemical, structural and morphological features of C-S-H gel. Simultaneously, the 29Si NMR results indicate that the Si O units are incorporated into the existing C-S-H, increasing its chain length. These results open the way for a simple concrete structures repairing procedure.

中文翻译：

---

通过二氧化硅低聚物和硅酸盐之间的反应生产 CSH 凝胶：一种有前景的修复胶凝材料的方法

摘要 浸渍处理是保护混凝土建筑和纪念碑免受风化退化的替代方法之一。然而，重要的是要考虑反应产物与建筑材料的化学相容性。此处研究的浸渍产品由二氧化硅低聚物组成，该低聚物能够通过简单的溶胶-凝胶工艺在混凝土的孔隙结构内聚合。在这项工作中，我们研究了这种浸渍处理产生与水泥浆接触的 CSH 凝胶的能力。反应产物的完整表征表明，来自二氧化硅低聚物的硅烷醇基团与水泥浆中存在的硅酸盐反应生成具有 CSH 凝胶化学、结构和形态特征的材料。同时地，29Si NMR 结果表明 Si O 单元并入现有的 CSH，增加了其链长。这些结果为简单的混凝土结构修复程序开辟了道路。