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混凝土在SO_4~(2-)和CO_3~(2-)共同存在下的腐蚀破坏
作者:马保国 高小建 何忠茂 董荣珍 
单位:武汉理工大学硅酸盐材料工程教育部重点实验室 武汉理工大学硅酸盐材料工程教育部重点实验室 兰州大学物质科学与技术学院 武汉理工大学硅酸盐材料工程教育部重点实验室 武汉 430070  武汉 430070  兰州 730000   武汉 430070 
关键词:混凝土  硫酸盐  碳酸盐  硅灰石膏 
分类号:TU528.01
出版年,卷(期):页码:2004,32(10):1219-1224
DOI:
摘要:
对西部水工混凝土受地下盐水侵蚀现状进行了现场调查和取样。用X射线衍射、扫描电子显微镜、X射线能量色散谱仪和激光Ra man光谱等方法研究了实际运行6a龄期混凝土的腐蚀产物。结果发现:在SO42-和CO32-长期作用下混凝土的腐蚀产物是由硅灰石膏、钙矾石、石膏和方解石组成的一种白色稀泥状混合物,经对该混合物分析证实处于低温、高湿、硫酸盐、碳酸盐条件下,混凝土发生了硅灰石膏型硫酸盐侵蚀破坏。
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A site survey with corresponding sampling was carried out for an attacked concrete exposed to ground water, which contains substantial salts. The degraded concrete component at 6 years old was taken from a hydraulic structure in the western China. Samples selected from the site were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive analysis of X-ray (EDAX), and laser Raman spectroscopy methods. The results show that a white mushy mixture consisting of thaumasite, ettringite, gypsum, and calcite occurs in the residual concrete due to a long-term exposure to SO_4~(2- )and CO_3~(2-) in the ground water. It is validated that the thaumasite form of sulfate attack (TSA) occurs in the field concrete, which has been undergoing at a low temperature, an adequate humidity, as well as a sulfate and carbonate attack.
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基金项目:
国家自然科学基金(50378075)资助项目。
作者简介:
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参考文献:
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