The creep and relaxation of cement paste caused by dissolving solid hydration products is evaluated in this work. According to the second law of thermodynamics, dissolution or precipitation of solid constituents may be altered by the change in stress/strain fields inside cement paste via alteration of the stress power or strain energy. Thus, it is hypothesized that stress‐induced dissolution can affect the overall creep/relaxation behavior of cement composites. A novel, fully coupled thermodynamic, mechanical, and microstructural model (TM²) that uses the finite element method was developed to predict the time‐evolving properties of cement paste under prescribed strains and to test the hypothesis. In the model, the strain energy was incorporated to accurately predict the effect of stress and strain fields on cement microstructure change. From the simulation results, depending on the stress/strain levels and the choice of the domain (over which the thermodynamic equilibrium is enforced), stress‐induced dissolution of solid constituents can lead to significant creep/relaxation.

中文翻译：

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应力引起的水合固体成分溶解导致水泥浆的蠕变和松弛

在这项工作中，评估了由溶解固体水合产物引起的水泥浆的蠕变和松弛。根据热力学第二定律，可以通过改变应力功率或应变能来改变水泥浆内部的应力/应变场，从而改变固体成分的溶解或沉淀。因此，假设应力引起的溶解会影响水泥复合材料的整体蠕变/松弛行为。新颖的，完全耦合的热力学，机械和微观结构模型（TM ²）开发了一种使用有限元方法来预测水泥浆在规定应变下随时间变化的特性并检验了假设的方法。在模型中，结合了应变能以准确预测应力和应变场对水泥微结构变化的影响。从模拟结果来看，取决于应力/应变水平和域的选择（在其上强制执行热力学平衡），应力诱导的固体成分溶解会导致明显的蠕变/松弛。