Discretization of the Water Uptake Process of Na-Montmorillonite Undergoing Atmospheric Stress: XRD Modeling Approach

摘要: This work focuses on the water-montmorillonite interaction under variable atmospheric conditions in order to characterize interlamellar space (IS) configuration for possible use context of geological barrier radioactive and industrial waste confinement. Atmospheric stress is achieved by applying, Na-rich montmorillonite, a water sorption/desorption constraint, created at laboratory scale. hydrological disturbance allows “demolition” clay history highlight hydrous performance. The structural analysis using modeling XRD profiles, which allowed us determine optimal parameters describing IS along axis. During “in situ” analysis, cycle envisaged variation relative humidity rate (%RH) from saturated condition (94 %RH) towards extremely dry ones (2-3 %RH). Qualitatively, new hydration hysteresis behavior “stressed” sample appears. Structural before after perturbation identify, respectively, homogeneous states, transition domains, heterogeneity degree. latter parameter characterized, quantitatively, abundances mixed-layer structure (MLS) population discerned over wide explored RH range. Using optimum parameter, molecule distribution versus applied strain was quantified.