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Effect of silica fume on corrosion resistance of cement-based materials under carbonic acid water environment
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-25 , DOI: 10.1016/j.cemconcomp.2025.105949
Jianhui Liu, Lurun Wu, Junmin Zhu, Hengrui Jia, Leping Liu, Shichong Zhang, Cong Yang, Zheng Chen, Caijun Shi

The effect of silica fume (SF) on corrosion depth, mass loss and compressive strength of mortar specimens over time under carbonic acid water environment were studied in this study. In addition, the thermal gravimetric analysis (TG-DTG), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to analyze the product evolution and microstructure of cement paste under such environment. Moreover, the corrosion process under carbonic acid water environment of cement-based materials was systematically discussed. A comprehensive explanation of the corrosion process was proposed, detailing the dynamic progression of CH leaching, carbonation, and deterioration over time and space. SF has different action mechanisms in different stages. On one hand, the addition of SF slightly increases the overall corrosion depth expansion rate due to reduced matrix alkalinity. In addition, it can promote the formation of calcium silicate hydrate (C-S-H) gels with a low Ca/Si ratio and densifies the microstructure of cement-based materials, thereby reducing mass loss and strength reduction and delaying the progression of deterioration depth under carbonic acid water environment. This study provides a comprehensive elucidation of the influence mechanism of SF on the carbonic acid water corrosion process in cementitious materials, offering new insights for enhancing concrete durability.

中文翻译:


硅灰对碳酸水环境下水泥基材料耐腐蚀性的影响



本研究研究了硅灰 (SF) 在碳酸水环境下对砂浆试件腐蚀深度、质量损失和抗压强度随时间的变化。此外,采用热重分析 (TG-DTG)、X 射线衍射 (XRD)、傅里叶变换红外光谱 (FTIR) 和扫描电子显微镜 (SEM) 分析了该环境下水泥浆体的产品演变和微观结构。此外,系统讨论了水泥基材料在碳酸水环境下的腐蚀过程。提出了对腐蚀过程的全面解释,详细说明了 CH 浸出、碳化和劣化随时间和空间的动态进展。SF 在不同阶段有不同的作用机制。一方面,由于基质碱度降低,SF 的添加略微增加了整体腐蚀深度膨胀率。此外,它还可以促进低 Ca/Si 比的硅酸钙水合物 (CSH) 凝胶的形成,并使水泥基材料的微观结构致密化,从而减少质量损失和强度降低,延缓碳酸水环境下劣化深度的进展。本研究全面阐明了 SF 对胶凝材料碳酸水腐蚀过程的影响机制,为提高混凝土耐久性提供了新的见解。
更新日期:2025-01-25
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