Estokova Adriana, Kovalcikova Martina, Luptakova Alena, Prascakova Maria
Institute of Environmental Engineering, Faculty of Civil Engineering, Technical University of Kosice, Kosice 04200, Slovak Republic.
Institute of Geotechnics, Slovak Academy of Sciences, Kosice 04001, Slovak Republic.
Materials (Basel). 2016 Apr 29;9(5):324. doi: 10.3390/ma9050324.
Current design practices based on descriptive approaches to concrete specification may not be appropriate for the management of aggressive environments. In this study, the durability of cement-based materials with and without the addition of silica fume, subjected to conditions that leach calcium and silicon, were investigated. Chemical corrosion was simulated by employing various H₂SO₄ and MgSO₄ solutions, and biological corrosion was simulated using sp. bacterial inoculation, leading to disrupted and damaged surfaces; the samples' mass changes were studied following both chemical and biological attacks. Different leaching trends were observed via X-ray fluorescence when comparing chemical with biological leaching. Lower leaching rates were found for concrete samples fortified with silica fume than those without silica fume. X-ray diffraction and scanning electron microscopy confirmed a massive sulfate precipitate formation on the concrete surface due to bacterial exposure.
当前基于混凝土规范描述性方法的设计实践可能不适用于侵蚀性环境的管理。在本研究中，研究了添加和不添加硅灰的水泥基材料在钙和硅浸出条件下的耐久性。通过使用各种硫酸和硫酸镁溶液模拟化学腐蚀，并使用特定细菌接种模拟生物腐蚀，导致表面破坏和损坏；研究了化学和生物侵蚀后样品的质量变化。比较化学浸出和生物浸出时，通过X射线荧光观察到不同的浸出趋势。发现添加硅灰的混凝土样品的浸出率低于未添加硅灰的样品。X射线衍射和扫描电子显微镜证实，由于细菌暴露，混凝土表面形成了大量硫酸盐沉淀。
