Modelling the effect of stress on the expansion of concrete subjected to ASR is of major importance to understand the mechanisms of damaged structures. In this paper, an existing poromechanical modelling combining creep and anisotropic damage is confronted with two recent experimental programmes on ASR-expansion under multiaxial applied stresses and prestressing. Based on parameters evaluated previously, the model is able to faithfully reproduce the concrete expansion in the three directions with only three parameters calibrated on the stress-free ASR expansion. The model points out the impact of the volume of ASR products formed in the porosity connected to reactive sites and to the induced diffuse cracking. The modification of the ASR volumetric expansion for concrete under stress observed in some experimental programmes could be explained by this effect. The model is compatible with a large variety of experimental observations performed on the effect of stress on ASR expansion available in the literature.

模拟应力对经受 ASR 的混凝土膨胀的影响对于了解受损结构的机制非常重要。在本文中，现有的结合蠕变和各向异性损伤的孔隙力学模型面临着两个最近的多轴施加应力和预应力下的 ​​ASR 膨胀实验程序。基于先前评估的参数，该模型能够忠实地再现三个方向的混凝土膨胀，只需在无应力 ASR 膨胀上校准三个参数。该模型指出了在与反应位点相连的孔隙中形成的 ASR 产物的体积以及对诱导扩散开裂的影响。在一些实验程序中观察到的应力作用下混凝土的 ASR 体积膨胀的修改可以用这种效应来解释。该模型与文献中关于应力对 ASR 扩展的影响的大量实验观察结果兼容。