This paper investigated the corrosion process of sugarcane bagasse ash (SCBA)-metakaolin (MK)-Portland cement (PC) system under carbonic acid water environment. The phases of cement paste before and after corrosion and microstructure were analyzed by X-ray diffraction, thermogravimetric analysis, Fourier transform infrared spectroscopy and scanning electron microscope. The results showed that the addition of SCBA to mortar does not significantly enhance overall strength or reduce corrosion depth, whereas MK exhibits superior strength (up to 13.1% higher than SCBA) and lower corrosion depth (up to 69.6% lower than SCBA after 90 days of corrosion). Furthermore, SCBA is more conducive to maintaining strength over time compared with MK. When both MK and SCBA are used in mortar, particularly with a MK content exceeding 15% and an SCBA content below 5%, the optimal corrosion resistance effectiveness can be achieved. This is attributed to the synergistic pozzolanic effect of MK and the filling effect of SCBA.

中文翻译：

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碳酸水环境下甘蔗渣灰-偏高岭土-硅酸盐水泥粘结剂水泥基材料的耐腐蚀性能

研究碳酸水环境下甘蔗渣灰（SCBA）-偏高岭土（MK）-硅酸盐水泥（PC）体系的腐蚀过程。采用X射线衍射、热重分析、傅里叶变换红外光谱和扫描电镜对水泥浆体腐蚀前后的物相及微观结构进行了分析。结果表明，在砂浆中添加 SCBA 并没有显着提高整体强度或减少腐蚀深度，而 MK 表现出优异的强度（比 SCBA 高出 13.1%）和较低的腐蚀深度（90 天后比 SCBA 低高达 69.6%）腐蚀）。此外，与 MK 相比，SCBA 更有利于长期保持力量。当MK和SCBA同时用于砂浆中时，特别是MK含量超过15%且SCBA含量低于5%时，可以达到最佳的耐腐蚀性能。这归因于 MK 的火山灰效应和 SCBA 的填充效应的协同作用。