In order to improve the durability of concrete structures, silicate-based impregnant have been used, but the chemical interaction mechanism is not clear. Silicate-based impregnant react with calcium hydroxide, which is formed during the process of cement hydration, and form compounds similar to a calcium silicate hydrate (C–S–H). This paper performs reaction experiments by Ca/Si ratio, and solid state nuclear magnetic resonance (NMR) and X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy are conducted for observing chemical changes of cement paste with silicate-based impregnants. Based on the results of XRD, reduction of monosulfate phase was observed as well as the formation of C–S–H (tobermorite-like phase). ²⁹Si and ²⁷Al NMR spectra also correspond with the XRD results. Further, possibility of both Al/Si substitution and formation of a structure close to C-(A)-S-H (C–S–H containing Al) were observed. Therefore, silicate-based impregnant formed not only new C–S–H reacting with calcium hydroxide, but also influenced other hydrates.

为了提高混凝土结构的耐久性，已使用硅酸盐基浸渍剂，但化学作用机理尚不清楚。硅酸盐基浸渍剂与在水泥水化过程中形成的氢氧化钙反应，并形成类似于硅酸钙水合物（C–S–H）的化合物。本文通过Ca / Si比进行反应实验，并进行了固态核磁共振（NMR）和X射线粉末衍射（XRD），傅立叶变换红外光谱（FT-IR）和拉曼光谱观察水泥的化学变化。硅酸盐基浸渍剂的糊状。根据X射线衍射的结果，观察到单硫酸盐相的还原以及C–S–H（钙铁矿状相）的形成。²⁹ Si和²⁷Al NMR谱也与XRD结果相对应。此外，观察到Al / Si取代的可能性以及形成接近C-（A）-SH（含铝的CS–H）的结构的可能性。因此，硅酸盐基浸渍剂不仅形成新的C–H–H与氢氧化钙反应，而且还影响其他水合物。