The role of magnesium during the hydration of C3S and C-S-H formation. Scanning electron microscopy and mid-infrared studies
The role of magnesium during the hydration of C3S and C-S-H formation. Scanning electron microscopy and mid-infrared studies
复制标题
DOI：
10.1680/adcr.2005.17.1.9
复制
发表时间：
2005
影响因子：
2
通讯作者：
L. Fernández;C. Alonso;A. Hidalgo;C. Andrade
中科院分区：
文献类型：
--
作者：
L. Fernández;C. Alonso;A. Hidalgo;C. Andrade
在氧化镁存在下由C3 S合成的一系列水合硅酸钙（C-S-H）凝胶的中红外（IR）光谱显示出与纯C-S-H凝胶的中红外光谱的许多相似之处。然而，在用MgO合成的C-S-H的所有光谱中都观察到了水镁石的振动带，尽管只有CaO/SiO2比最高的样品（1·8）显示出以530 cm−1为中心的大肩，这被归因于在C-S-H凝胶的二氧化硅链中插入了具有四重配位的镁。通过扫描电镜和X射线能谱分析，在C-S-H凝胶中CaO/SiO_2比值最低的区域（0.66）发现了假设的硅酸镁水合物（M-S-H）凝胶的形成。
Mid-infrared (IR) spectra of a series of calcium silicate hydrates (C-S-H) gels synthesised from C3S in the presence of magnesium oxide show many similarities with the mid-IR spectra of pure C-S-H gels. However, the presence of the vibration bands attributed to brucite is observed in all spectra of C-S-H synthesised with MgO, although only the sample with the highest CaO/SiO2 ratio (1·8) reveals a large shoulder centred at 530 cm−1, which has been assigned to the presence of magnesium with a four-fold coordination inserted in the silica chains of the C-S-H gel. The postulated formation of magnesium silicate hydrates (M-S-H) gel was detected by scanning electron microscope and energy dispersive analysis of X-rays in some areas of the C-S-H gel with the lowest CaO/SiO2 ratio (0·66).