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以山东胶东调水工程为例,系统研究了混凝土快速破坏机理。通过扫描电子显微镜、能谱分析、X射线衍射和Raman谱分析研究了破坏混凝土水泥基体和析出物的矿物成分,并分析混凝土在实际工程环境中可能发生的化学反应和物理反应。结果表明:普通混凝土在河水和弱硫酸盐环境中也能发生非常迅速的侵蚀反应,在一个冬季内,混凝土强度便完全丧失;混凝土的快速破坏是混凝土在低温情况下,遭受硫酸盐和碳酸盐共同侵蚀的结果,白色析出物主要是硅灰石膏、钙矾石、方解石、石膏等物质。
Taking Shandong Jiaodong water transfer project as an example, the rapid failure mechanism of concrete was studied systematically. The mineral composition of concrete matrix and precipitates in concrete was studied by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and Raman spectroscopy. The chemical reaction and physical reaction of concrete in practical engineering environment were analyzed. The results show that ordinary concrete can also react very quickly in river water and weak sulfate environment, and the strength of concrete is completely lost in one winter. The rapid destruction of concrete is caused by the concrete being exposed to sulfate and carbonate As a result of common salt erosions, the white precipitates are mainly silica gray gypsum, ettringite, calcite, gypsum and the like.