Concrete Deterioration and Floor Heave Due to Biogeochemical Weathering of Underlying Shale
Concrete Deterioration and Floor Heave Due to Biogeochemical Weathering of Underlying Shale
复制标题
下伏页岩生物地球化学风化引起的混凝土劣化和底板隆起
DOI：
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发表时间：
1975
期刊：
影响因子：
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通讯作者：
W. J. Eden
中科院分区：
文献类型：
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作者：
P. Grattan;W. J. Eden
当渥太华新爱丁堡地区一座教堂的地下室地板隆起时，人们发现地板下的混凝土由于受到下面页岩中黄铁矿氧化形成的硫酸盐溶液的侵蚀而变成了糊状的稠度。石膏是页岩风化带的主要产物。结果表明，起伏是由于页岩片层间石膏晶体的生长引起的。在风化的页岩中还发现了黄铁矿的一系列氧化反应形成的黄钾铁矾。有些氧化反应只有在含硫细菌存在的情况下才会发生。混凝土的胶凝部分被酸浸出，留下一种弱多孔材料。强调了保护与潜在膨胀页岩接触的混凝土不受硫酸盐侵蚀的重要性。
When the basement floor of a church in the New Edinburgh area of Ottawa heaved, it was discovered that the concrete under the floor had been reduced to a mushy consistency due to attack by sulfate solution formed by the oxidation of pyrite in the underlying shale. Gypsum was the main product in the weathered zone of the shale. It is shown that heaving resulted from the growth of gypsum crystals between the lamellae in the shale. Jarosite, which is formed by a series of oxidation reactions from pyrite, was also found in the weathered shale. Some oxidation reactions occur only in the presence of sulfur bacteria. The cementitious portion of the concrete was leached out by acid, leaving a weak porous material. The importance of safeguarding concrete in contact with potentially expansive shales from sulfate attack is emphasized.