Predicting the atmospheric carbonation of cementitious materials using fully coupled two-phase reactive transport modelling
Predicting the atmospheric carbonation of cementitious materials using fully coupled two-phase reactive transport modelling
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DOI：
10.1016/j.cemconres.2019.105966
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发表时间：
2020-04-01
影响因子：
11.4
通讯作者：
de Lacaillerie, J-B d'Espinose
中科院分区：
文献类型：
--
作者：
Seigneur, N.;Kangni-Foli, E.;de Lacaillerie, J-B d'Espinose
水泥基材料和混凝土在大气碳化作用下的耐久性评价一直是国内外研究的热点。对该主题的实验研究表明，除其他结果外，响应强烈依赖于水泥成分。本文重点介绍了两种模型材料：水化C3 S浆体和低pH值浆体，其中表现出较高的开裂倾向。我们表明，一个完全耦合的反应输运模型可以重现测量的碳酸化实验深度，而不需要拟合参数。灵敏度提供了关于最相关参数的见解，以准确地模拟大气碳酸化。此外，结果表明，低pH值水泥材料可能是固有的机械强度较低时，受到大气碳酸化，由于较高的C-S-H脱钙率。这意味着这些材料更有可能形成裂缝，这可能对气体或放射性废物处置框架产生影响。
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 C3S 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.