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Behavior of hydrates in cement paste reacted with silicate-based impregnant
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2020-09-16 , DOI: 10.1016/j.cemconcomp.2020.103810
Jihoon Kim , Ryoma Kitagaki

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.



中文翻译:

与硅酸盐基浸渍剂反应的水泥浆中水合物的行为

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。

更新日期:2020-09-22
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