Abstract This work focuses on the study of macroscopic mechanical behavior of cement paste in relation with micro-structural degradation due to chemical leaching. According to experimental evidences, the degradation of cement paste is mainly characterized by a significant increase of porosity due to the dissolution of Portlandite (CH) and the decalcification of calcium silicate hydrates (C–S–H). We shall first establish the explicit relations between macroscopic elastic properties and plastic yield stresses and porosity of cement paste by using analytical homogenization methods. With these relations, the degradation of elastic and plastic properties of cement paste by chemical leaching can be systematically determined. Combining with a specific plastic hardening law, the complete micro-macro constitutive model is formulated to describe the mechanical behavior of cement paste under general loading conditions. The efficiency of the proposed model is assessed through the comparison between numerical results and experimental data in uniaxial and triaxial compression tests performed on both sound and leached samples.

中文翻译：

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基于微观结构的具有化学浸出效应的水泥浆体本构模型

摘要 这项工作的重点是研究水泥浆体的宏观力学行为与化学浸出引起的微观结构降解有关。根据实验证据，水泥浆体降解的主要特征是由于硅酸盐（CH）的溶解和硅酸钙水合物（C-S-H）的脱钙，孔隙率显着增加。我们将首先使用解析均质化方法建立宏观弹性特性与塑性屈服应力和水泥浆体孔隙率之间的显式关系。有了这些关系，就可以系统地确定化学浸出对水泥浆体弹性和塑性性能的影响。结合特定的塑性硬化规律，完整的微观宏观本构模型用于描述一般加载条件下水泥浆体的力学行为。通过对声音和浸出样品进行的单轴和三轴压缩试验中的数值结果和实验数据之间的比较来评估所提出模型的效率。