  Chemo-mechanical effects are known to be significant in a number of
applications in modern geomechanics, ranging from slope stability assessment to
soil improvement and CO2 sequestration. This work focuses on coupled
chemo-mechanical modeling of bonded geomaterials undergoing either mechanical
strengthening, due to increased cementation, or weakening, due to cement
dissolution. A constitutive model is developed that accounts for the
multi-scale nature of the chemo-mechanical problem, introducing some
cross-scale functions establishing a relationship between the evolution of
microscopic variables and the macroscopic material behavior, realistically
following the evolution of the reactive surface area, cross-sectional area and
the number of bonds along with dissolution/deposition. The model presented here
builds up on a previously introduced framework. However, at variance with
existing works, it is specialized on materials with only reactive bonds, such
as carbonate cemented sandstone or microbially cemented silica sand. Model
validation is provided upon reproducing different types of chemo-mechanical
experimental datasets, on different naturally and artificially cemented
materials, to establish the reliability of the proposed framework.
