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首页> 外文期刊>Materials Characterization >Composition of alkali-silica reaction products at different locations within concrete structures
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Composition of alkali-silica reaction products at different locations within concrete structures

机译：混凝土结构内不同位置的碱硅反应产物的组成

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Four concrete structures from Northern Portugal-three dams and one bridge-were studied. In the three dams concrete was produced with granitic aggregates. In the bridge, aggregates from an aluvial deposit were used. Pebbles show a wide range of lithologies, though dominantly siliceous. Petrographic techniques were applied in the study of these structures in which signs of deterioration were identified in order to confirm that the deterioration was caused by alkali-silica reactions. Alkali-silica gel was found in all the structures under different forms. It was verified that the texture and composition of the gel varies according to its location inside the concrete and also when compared with extruded gel. This finding is of interest in regard to the assumption that the composition of the gel is related to its expansivity. From the analyses carried out it was verified that silicon is always the main component. In some samples, calcium exists as the second most important component, but in others calcium is hardly detected. Alkalis show a low content in all the analyses. Sometimes aluminum is also detected. An attempt is made to correlate the composition of the gel to its location in concrete. The results are discussed in relation to data published by other authors.
机译：研究了葡萄牙北部的四座混凝土结构，三座水坝和一座桥梁。在这三个大坝中，混凝土是用花岗岩骨料生产的。在桥梁中，使用了来自冲积物的骨料。尽管主要为硅质，但鹅卵石显示出广泛的岩性。在这些结构的研究中，采用了石油学技术，其中已识别出劣化迹象，以确认该劣化是由碱-二氧化硅反应引起的。在所有结构中均以不同形式发现了碱性硅胶。证实了凝胶的质地和组成根据其在混凝土中的位置以及与挤出的凝胶相比而变化。关于凝胶的组成与其膨胀性有关的假设，该发现是令人感兴趣的。通过进行的分析，证实了硅始终是主要成分。在某些样品中，钙是第二重要的成分，但是在其他样品中，几乎没有检测到钙。碱在所有分析中的含量均较低。有时也检测到铝。试图使凝胶的组成与其在混凝土中的位置相关。讨论了有关其他作者发表的数据的结果。

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