Reactive transport modeling of geochemical interactions at a concrete/argillite interface, Tournemire site (France)

Impact of a 70 °C temperature on an ordinary Portland cement paste/claystone interface: An in situ experiment

“…It is worth mentioning that tobermorite and phillipsite are thermodynamically stable both at 20°C and 70°C in a (altered) cement paste [45] and have therefore often been overestimated in models at ambient temperature [e.g. 49,50].…”

5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland)

“…Laboratory experiments (Adler 2001;Adler et al 2001;Dauzeres et al 2010) and in situ experiments (Read et al 2001;Tinseau et al 2006;Gaboreau et al 2011Gaboreau et al , 2012Techer et al 2012;Jenni et al 2014) demonstrate alteration of both cement paste and claystone adjacent to interfaces. An increase in porosity in the cement paste close to the interface, and clogging in the claystone adjacent to it are commonly predicted by reactive transport modelling (De Windt et al 2008;Marty et al 2009;Kosakowski and Berner 2013;Bradbury et al 2014). Changes in porosity and its distribution-and therefore also permeability-near such interfaces are an important process governing the long-term physicochemical evolution of the engineered barrier and its geological near-field (Kosakowski and Berner 2013, Bildstein and Claret 2015).…”

Benchmarks for multicomponent reactive transport across a cement/clay interface

“…Numerous papers have described the results of reactive transport modelling at this interface, with various degrees of complexity [5]. Some authors adopted a purely thermodynamic approach [6][7][8][9], while others opted for coupling thermodynamic and kinetic approaches [10][11][12][13][14][15][16][17][18][19][20][21][22]. The topic of cement/clay interactions thus provides an excellent opportunity for testing reactive transport codes for their accuracy, robustness, completeness, and numerical stability.…”