Abstract The drying of cement-based materials affects directly their durability, which has a major financial/societal impact. Notably, the variation of saturation of the porous network as well as drying shrinkage are fundamental processes since they drive together cracking and the penetration rate of aggressive chemicals. Many macroscopic models describe the moisture transport within porous media. They can be broadly divided into two main categories: multiphase macro-models which take into account the presence of three fluid phases (liquid water, vapor and dry air), and simplified models considering less phases under the main assumption of constant gas pressure during the drying process. Moreover, the choice of different behavior laws, which describe different evolutions of desorption isotherms, relative permeability, permeability to liquid water in function of temperature, has a major impact on mass loss amount and kinetics. Quantification of these simplifications effects regarding the used model and the choice of behavior laws was done by comparing mass loss response surfaces in a relative humidity and temperature space for multiple configurations. The results show relative error maps at early, mid and late drying stages for every compared case.

中文翻译：

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常见简化对水泥基材料干燥至中等温度的影响

摘要 水泥基材料的干燥直接影响其耐久性，这对经济/社会具有重大影响。值得注意的是，多孔网络饱和度的变化以及干燥收缩是基本过程，因为它们共同驱动开裂和侵蚀性化学品的渗透率。许多宏观模型描述了多孔介质内的水分传输。它们可以大致分为两大类：考虑三种流体相（液态水、蒸汽和干燥空气）存在的多相宏观模型，以及在气体压力恒定的主要假设下考虑较少相的简化模型。干燥过程。此外，不同行为定律的选择，描述了解吸等温线、相对渗透率、液态水的渗透性随温度变化，对质量损失量和动力学有重大影响。通过比较多个配置的相对湿度和温度空间中的质量损失响应面，对有关所用模型和行为法则选择的这些简化效果进行量化。结果显示了每个比较案例在早期、中期和晚期干燥阶段的相对误差图。