The durability assessment of cementitious materials and concrete subjected to atmospheric carbonation of concrete has been an extensive study of research. Experimental studies on the subject show, among other results, that the response depends strongly on the cement composition. This paper focuses on two model materials: an hydrated C 3 S paste and a low-pH paste, which exhibits a higher tendency to cracking. We show that a fully coupled reactive transport model can reproduce the measured experimental depths of carbonation without a need of fitting parameters. A sensitivity provides insights about the most relevant parameters to accurately model the atmospheric carbonation. Furthermore , results suggest that low-pH cement materials might be inherently less mechanically robust when subjected to atmospheric carbonation, due to a higher C-S-H decalcification rate. This implies that these materials are more likely to develop fractures, which could have implications in the framework of gas or radioactive waste disposal.

中文翻译：

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使用完全耦合的两相反应输运模型预测胶结材料的大气碳化

对混凝土进行大气碳化的胶结材料和混凝土的耐久性评估已成为一项广泛的研究。对该主题的实验研究表明，除其他结果外，响应在很大程度上取决于水泥成分。本文重点介绍两种模型材料：水合 C 3 S 糊料和低 pH 糊料，它们具有较高的开裂倾向。我们表明，完全耦合的反应传输模型可以在不需要拟合参数的情况下重现测量的碳化实验深度。灵敏度提供有关最相关参数的见解，以准确模拟大气碳化。此外，结果表明，当受到大气碳化作用时，低 pH 值水泥材料可能固有的机械强度较低，由于较高的 CSH 脱钙率。这意味着这些材料更有可能产生裂缝，这可能对气体或放射性废物处理的框架产生影响。