Throughout history, architectural heritage has been constructed using masonry, clay or stone elements, and lime‐based mortars. Over time, old buildings are subjected to different degrees of movement and degradation, leading to the formation of microcracks. Water dissolves and transports lime in mortar, but when the water evaporates, the lime is deposited and heals cracks in a process known as autogenous healing. Lime‐based mortars can regain some mechanical properties due to their healing capacity, given certain conditions. In the present work, a constitutive formulation has been developed to simulate cracking and healing in lime‐based mortars. The proposed model captures the residual displacements within cracks, associated with interacting crack surface asperities, as well as the healing effect on mechanical properties. A new approach is described which expresses these mechanisms mathematically within a micromechanical formulation. The proposed model was validated by comparing the outputs with experimental data. The results show that the new continuum micromechanical damage‐healing model could capture the damage‐healing cycle with good accuracy.

中文翻译：

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石灰基砂浆自愈的模拟


纵观历史，建筑遗产是使用砖石、粘土或石材元素以及石灰基砂浆建造的。随着时间的推移，旧建筑会受到不同程度的移动和退化，从而导致微裂纹的形成。水在砂浆中溶解和运输石灰，但当水蒸发时，石灰会沉积并在称为自体愈合的过程中愈合裂缝。在某些条件下，石灰基砂浆由于其愈合能力可以恢复一些机械性能。在本工作中，已经开发了一种本构配方来模拟石灰基砂浆的开裂和愈合。所提出的模型捕获了裂纹内与相互作用的裂纹表面粗糙度相关的残余位移，以及对机械性能的愈合效果。描述了一种新方法，该方法在微机械公式中以数学方式表达这些机制。通过将输出与实验数据进行比较来验证所提出的模型。结果表明，新的连续体微机械损伤愈合模型可以很好地捕捉损伤愈合周期。