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通过X射线衍射分析、扫描电子显微镜、Fourier变换红外光谱分析及激光Raman光谱分析等技术,研究了C3A和C3S的比例对掺30%石灰石粉水泥浆体经5%MgSO4溶液侵蚀后碳硫硅酸钙形成的影响及机理。结果表明:C3A的存在及相对含量并不是碳硫硅酸钙形成的必备条件,硫酸盐、碳酸盐会与水泥水化产物CSH凝胶直接发生反应,导致水泥水化产物CSH凝胶解体,生成无任何胶结性的碳硫硅酸钙,无需或者只需少许铝相参与反应,而且掺少量或不掺铝相的腐蚀试样中主要含有碳硫硅酸钙、钙矾石和石膏。
The effects of the ratio of C3A and C3S on the corrosion resistance of carbon-sulfur-silicate-doped cement paste mixed with 30% limestone cement slurry by 5% MgSO4 solution were studied by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy and laser Raman spectroscopy. Effect and mechanism of calcium formation. The results show that the presence and relative content of C3A are not the prerequisites for the formation of calcium carbon sulfosuccinate. Sulfates and carbonates react directly with the cement hydration product CSH gel, resulting in the disintegration of cement hydration product CSH gel , Resulting in calcium carbon-sulfur calcium silicate without any cementing, requiring little or no exposure to the aluminum phase. In addition, the corrosion samples doped with or without aluminum mainly contained calcium carbon-sulfur calcium silicate, ettringite, and gypsum.