Abstract

The main component of the cement hydration, are both, the calcium silicate hydrate (C–S–H) and calcium silicate hydrate with Al (C–S(A)–H), whose composition is characterized by its calcium to silicon ratio (Ca/Si), which normally varies from 0.6 to 1.6. The theoretical Ca/Si ratios of the synthesized gels were compared with those of the experimental gels, which were determined by inductively coupled plasma atomic emission spectroscopy (ICP-OES). In addition, the microstructure of the gels was studied by spectroscopic techniques: infrared and Raman spectroscopy and nuclear magnetic resonance. By the double-decomposition method used in this work (1 day at 25 °C, inert atmosphere and pH = 12.3), only C–S–H and C–S(A)–H gels with a maximum Ca/Si ratio ranging from 0.8 to 1.0 were synthesized. However, the structures of the gels are slightly different as the Ca/Si ratio increases.

Calcium silicate hydrate, with and without Al has been synthetized following double decomposition method, with different Ca/Si ratio. Analyzing Ca/Si ratio of the formed compounds, indicate that C–S(A)-H with Ca/Si ratios from 0.6 to 1.1 can be formed.

中文翻译：

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C–S–H和C–S（A）–H凝胶中实验和理论Ca / Si比的比较

摘要

水泥水化的主要成分是硅酸钙水合物（C–H–H）和硅酸钙与铝的水合物（C–S（A）–H），其组成特征在于其钙硅比（ Ca / Si），通常在0.6到1.6之间变化。将合成凝胶的理论Ca / Si比与实验凝胶的理论Ca / Si比进行了比较，后者通过感应耦合等离子体原子发射光谱法（ICP-OES）确定。另外，通过光谱技术研究了凝胶的微观结构：红外和拉曼光谱以及核磁共振。通过这项工作中使用的双分解方法（在25°C，惰性气氛和pH = 12.3的情况下放置1天），只有C–S–H和C–S（A）–H凝胶的最大Ca / Si比范围为合成了0.8至1.0。然而，

通过双重分解方法，用不同的Ca / Si比合成了有铝和无铝的水合硅酸钙。分析形成的化合物的Ca / Si比，表明可以形成Ca / Si比为0.6至1.1的C–S（A）-H。