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The microstructural geometry (MG) of materials has a significant influence ontheir macroscopic response, all the more when the process is essentiallymicroscopic as for microstructural degradation processes. However, the MG tendsto be approximated by ideal spherical packings with constitutive description ofthe microstructural contacts. Interfaces tracking models like phase-fieldmodeling (PFM) are promising candidates to capture the microstructuresdynamics. Contact PFM (CPFM) enables to include catalyzing/inhibiting (CI)effects, accelerating/delaying equilibrium, such as temperature or the presenceof certain constituents. To emphasize the influence of geometry and CI effects,we study numerically the chemo-mechanical response of digitalized geomaterialsat the grain scale. An application to pressure solution creep (PSC) shows theimportance of the MG and how the influence of temperature and clay can be takeninto account without explicit modeling. As already inferred in previous workson PSC, the lack of MG considerations could be the reason why a uniquedescription of PSC is missing. A simple reason could be that PSC is directlydependent on the strain concentration, which is directly dependent on the MG.This is our motivation here to investigate and suggest the influence of the MGon a degradation process like PSC.

Contact phase-field modeling for chemo-mechanical degradation processes. Part II: Numerical applications with focus on pressure solution