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Sorption of Se(VI) and Se(IV) on AFm phases Open
Selenate and selenite can sorb on AFm phases such as monosulfate, monocarbonate or hemicarbonate. Sorption and co-precipitation experiments were performed to determine their potential for the immobilization of two of the main aqueous speci…
View article: Coupling of porosity and diffusive transport in highly reactive systems: Open issues of reactive transport modelling
Coupling of porosity and diffusive transport in highly reactive systems: Open issues of reactive transport modelling Open
Mineral precipitation at interfaces between contrasting materials and porewaters decreases the local porosity and consequently reduces transport across the interface. The near-field of waste repositories usually contains reactive interface…
View article: Chloride accessible porosity fractions across the Jurassic sedimentary rocks of northern Switzerland
Chloride accessible porosity fractions across the Jurassic sedimentary rocks of northern Switzerland Open
The Jurassic clay-rich sedimentary sequence in northern Switzerland was investigated in the context of nuclear waste disposal. Tracer profiles across this sequence play an important role when assessing transport processes and long-term evo…
View article: Porewater composition in clay rocks explored by advective displacement and squeezing experiments
Porewater composition in clay rocks explored by advective displacement and squeezing experiments Open
Argillaceous rocks are foreseen in many countries as the potential hosts for nuclear waste repositories. The knowledge of the chemical composition of the free porewater in these formations is required for the understanding of the paleo-hyd…
View article: Percolation experiment across a 10-year-old interface between Opalinus Clay and Portland concrete
Percolation experiment across a 10-year-old interface between Opalinus Clay and Portland concrete Open
An interface sample between Portland concrete and Opalinus Clay with a contact time of 10 years recovered from a field experiment was investigated by SEM-EDX and X-ray CT. The concrete side showed a large chloride ingress from the clayston…
Toward Better Understanding of the Ferrofluid Impregnation Process and Potential Artefacts—A Prerequisite for Reliable Interpretation of Magnetic Pore Fabrics Open
Magnetic pore fabrics (MPFs) serve as efficient proxy for pore alignment and preferential flow directions. Anisotropy of magnetic susceptibility of impregnated samples reflects the shape and arrangement of ferrofluid‐filled pores. Reliable…
Tracer transport and reactive transport modeling of clay-concrete interaction: The CI/CI-D experiments at Mont Terri. Open
The CI-D Experiment is a field test performed at the Mont \n Terri rock laboratory (Switzerland). It concerns the diffusion of \n HTO and 36Cl- through concrete and Opalinus Clay (OPA) from \n a small point-source-like circulation interval…
Mechanisms and thermodynamic modelling of iodide sorption on AFm phases Open
Both, experimental and modelling evidence is presented in this study showing that interlayer anion exchange is the dominant sorption mechanism for iodide (I-) on AFm phases. AFm phases are Ca-Al(Fe) based layered double hydroxides (LDH) kn…
Sorption Experiments with HTO, 36-Cl, 125-I and 14-C Labeled Formate on Aged Cement Matrices Retrieved from Long-term In-situ Rock Laboratory Experiments Open
The long-term performance of a cement-based barrier system, envisaged worldwide in many concepts for deep geological storage of radioactive waste, depends on its material properties and how they evolve with time. Chemical interactions with…
View article: Reactive Transport Simulation of Low-pH Cement Interacting with Opalinus Clay Using a Dual Porosity Electrostatic Model
Reactive Transport Simulation of Low-pH Cement Interacting with Opalinus Clay Using a Dual Porosity Electrostatic Model Open
Strong chemical gradients between clay and concrete porewater lead to diffusive transport across the interface and subsequent mineral reactions in both materials. These reactions may influence clay properties such as swelling behaviour, pe…
View article: Alteration of Bentonite Reacted with Cementitious Materials for 5 and 10 years in the Mont Terri Rock Laboratory (CI Experiment)
Alteration of Bentonite Reacted with Cementitious Materials for 5 and 10 years in the Mont Terri Rock Laboratory (CI Experiment) Open
The cement–clay interaction (CI) experiment was carried out at the Mont Terri rock laboratory to complement the current knowledge on the influence that cementitious materials have on Opalinus Clay (OPA) and bentonite (MX). Drill cores incl…
View article: Molecular dynamics data for modelling the microstructural behaviour of compacted sodium bentonites
Molecular dynamics data for modelling the microstructural behaviour of compacted sodium bentonites Open
The water retention curve deduced with low water content data allows the modelling of the bentonite void ratio associated with the pores located inside the clay aggregates, or micropores. However, if both the water content and the micropor…
View article: Bentonite backfill performance in a high-level waste repository: a geochemical perspective
Bentonite backfill performance in a high-level waste repository: a geochemical perspective Open
Bentonite is a widely used natural material with many applications. Owing to its good sealing\nproperties, compacted bentonite is foreseen as a backfill material for deposition tunnels in highlevel\nwaste repositories in several countries.…
Development of physical fitness performance in young Swiss men from 2006 to 2015 Open
From 1980 to 2000, physical fitness decreased and body mass index (BMI) increased in the population of many industrialized countries. Little is known about these trends after the year 2000. This study aimed to investigate physical fitness …
Advective Displacement Method for the Characterisation of Pore Water Chemistry and Transport Properties in Claystone Open
The advective displacement method applies large hydraulic gradients to a confined rock core sample to yield small aliquots of the preserved in situ pore water, applicable to aquitard rocks with hydraulic conductivities as low as 10 −14 m/s…
View article: 5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland)
5-year chemico-physical evolution of concrete–claystone interfaces, Mont Terri rock laboratory (Switzerland) Open
International audience
View article: In situ interactions between Opalinus Clay and Low Alkali Concrete
In situ interactions between Opalinus Clay and Low Alkali Concrete Open
International audience
Characterization of Pore Water, Ion Transport and Water-rock Interaction in Claystone by Advective Displacement Experiments Open
Displacement of preserved pore water from claystones by imposing a hydraulic gradient with an artificial pore water yields early extracts characteristic of the pore water. Long-term tracer breakthrough behavior provides transport propertie…
Hydrochemical and Isotopic (δ2H, δ18O, 3H) Characterization of Fracture Water in Crystalline Rock (Grimsel, Switzerland) Open
Knowledge on water circulation through crystalline rock is of key interest for radioactive waste disposal, geothermal projects or groundwater supply. This study presents first results of long-term monitoring of fracture groundwater chemica…
Porewater Chemistry in Claystones in the Context of Radioactive Waste Disposal Open
The development of a combined experimental-modelling approach has enabled to constrain the porewater chemistry of different low-permeability clay formations (Boom Clay, Callovo-Oxfordian Fm., Opalinus Clay) foreseen as host rocks for nucle…
Constraints on Evolution and Residence time of Geothermal Water in Granitic Rocks at Grimsel (Switzerland) Open
Thermal spring water (17–28°C) occurring in crystalline rocks at the Grimsel area, Switzerland, represents a mixture of an old geothermal component with a surface-derived, young cold water component. Comparison of chemical and isotope data…