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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。
Abstract：The effect of aluminum-bearing phase content on the thaumasite formation of cement pastes containing limestone powder was investigated. The specimens were the mixture of different ratios of tricalcium aluminate to tricalcium silicate with limestone powder of 30% and cured in 5% MgSO4 solution. The formation of thaumasite was analyzed by X-ray diffraction, scanning electron microscopy, laser-Raman spectroscopy and Fourier transform infrared spectroscopy, respectively. The results show that the C3A content is not one of the necessary conditions for the thaumasite formation. The thaumasite formation is the direct result from calcium silicate hydrate reacting with appropriate carbonate, sulfate, Ca2+ ions and excess water. Moreover, the deteriorated products in specimen with a little or no aluminum mainly contain thaumasite, ettringite and gypsum.
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基本信息:
中图分类号:TU528
引用信息:
[1]李相国,何超,罗忠涛,等.铝酸三钙的含量对含石灰石粉水泥浆体碳硫硅酸钙形成的影响(英文)[J].硅酸盐学报,2013,41(11):1546-1550.
基金信息:
国家自然科学基金(51178363);; 先进建筑材料四川省重点实验室(08zxxk02);; 国家留学基金
2013-10-28
2013-10-28
2013-10-28