Andreas Jenni
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View article: Modelling anion-accessible porosity of rocks based on different approaches
Modelling anion-accessible porosity of rocks based on different approaches Open
Anionic radionuclides are relevant contributors to the overall dose that may originate from an underground repository for radioactive waste. Clays are important parts of engineered and natural barriers of repositories due to their sealing …
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: Unravelling the corrosion processes at steel/bentonite interfaces in in situ tests
Unravelling the corrosion processes at steel/bentonite interfaces in in situ tests Open
Microscopic and spectroscopic analyses were conducted on steel/bentonite interface samples removed from four in situ experiments that were carried out in three underground research laboratories at different temperatures and under different…
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…
View article: Interaction of Corroding Iron with Eight Bentonites in the Alternative Buffer Materials Field Experiment (ABM2)
Interaction of Corroding Iron with Eight Bentonites in the Alternative Buffer Materials Field Experiment (ABM2) Open
Bentonite, a common smectite-rich buffer material, is in direct contact with corroding steel in many high-level radioactive waste repository designs. The interaction of iron with the smectite-rich clay may affect its swelling and sealing p…
View article: Potential impact of cementitious leachates on the buffer porewater chemistry in the Finnish repository for spent nuclear fuel – A reactive transport modelling assessment
Potential impact of cementitious leachates on the buffer porewater chemistry in the Finnish repository for spent nuclear fuel – A reactive transport modelling assessment Open
Cementitious materials will be used during the construction and operation of a geological repository for spent nuclear fuel at Olkiluoto in Finland. Upon contacting water, cement dissolution will generate high-pH leachates, which might eve…
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.…
View article: Microstructural Evolution and Physical Properties of Polymer-Modified Mortars
Microstructural Evolution and Physical Properties of Polymer-Modified Mortars Open
Polymer-modified cementitious materials provide the base for building materials commonly used on modern
construction sites. By adding polymers, the properties of cementitious materials can be extended to suit a variety
of applications. W…
View article: Comparison of the hydrogeochemical and mechanical behaviours of compacted bentonite using different conceptual approaches
Comparison of the hydrogeochemical and mechanical behaviours of compacted bentonite using different conceptual approaches Open
This study compares the capabilities of two numerical models that simulate the behaviour of compacted saturated MX-80 bentonite exposed to different chemical environments. Both codes have different approaches: one of them is a reactive tra…
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