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针对短期服役4 a即开裂破坏的某混凝土构件,采用化学分析、X射线荧光分析、X射线衍射分析和热重分析检测了混凝土芯样浆体的化学和矿物组成,采用岩相法和扫描电镜/能谱分析观测了芯样的微观结构。结果表明:混凝土中部分细集料和少量粗集料发生了明显的碱硅酸反应;混凝土浆体-集料界面区存在大量不同形貌钙矾石异常富集生长,且在浆体-集料界面区发现相伴而生的碱硅酸凝胶和钙矾石产物。混凝土构件破坏是一较为典型的碱硅酸反应与延迟性钙矾石形成共存破坏案例。
The chemical and mineral compositions of the concrete core sample slurry were determined by chemical analysis, X-ray fluorescence analysis, X-ray diffraction analysis and thermogravimetric analysis. The rock-phase method and scanning electron microscope The energy spectrum analysis observed the microstructure of the core sample. The results show that some alkali-silicate reactions occur on some fine aggregates and a small amount of coarse aggregates in concrete. In the concrete slurry-aggregate interface area, a large number of different anatase ettringites are abnormally enriched and grown, and in slurry- Material interface area was found to be accompanied by alkali silicate gel and ettringite products. The failure of concrete members is a typical case of alkaline silicate reaction and delayed ettringite formation coexistence and destruction.