Modelling iron–clay interactions in deep geological disposal conditions

Stability of Clay Barriers Under Chemical Perturbations

“…The modeling results overall converge to predict a pH increase up to 8e9 (Montes et al, 2005;Hunter et al, 2007;Lu et al, 2011;Wersin and Birgersson, 2014), and even higher up to 10e11 at the iron-clay interface (Bildstein et al, 2006;Samper et al, 2008;Wersin et al, 2008;Marty et al, 2010;Savage et al, 2010a). The lower pH values are usually associated with high precipitation rates (or local equilibrium assumption) or low corrosion rates for the temperature considered ( 1 mm/year).…”

“…Porosity reduction (clogging) is predicted in the corrosion product layer in long-term calculations, but it is usually accompanied by porosity increase in the clay barrier (Montes et al, 2005;Bildstein et al, 2006;Samper et al, 2008;Marty et al, 2010), so the net balance of pore volume is not easy to interpret. Moreover, the petrophysical and transport properties, and the mechanical durability of these alteration zones are not well known.…”

Thermodynamic and fully-coupled reactive transport models of a steel–bentonite interface

“…Although this issue remained of interest to those waste agencies planning to employ iron or steel canisters/overpacks in their repository concepts, little more research was undertaken until new experimental and modelling studies in the late 1990's which have continued until recent times (e.g. Kamei et al, 1999;Guillaume et al, 2003;Bildstein et al, 2006;Lantenois et al, 2005;Charpentier et al, 2006;Wilson et al, 2006aWilson et al, , 2006bPerronnet et al, 2007Perronnet et al, , 2008Osacký et al, 2010;.…”

“…Many of these more recent models include complex reaction kinetics (Bildstein et al, 2006;Montes-H et al, 2005;Savage et al, 2010a).…”

Corrosion of a carbon steel covered by treated bentonites in aqueous solution

“…Bildstein underlines the fact that corrosion products interact with the clay by ion exchange causing the alteration of its properties [13]. These alterations are supposed to affect mainly the structure of the clay [11,14].…”