A5045178709- CO2 Sequestration and Geologic Interactions
- Concrete and Cement Materials Research
- Groundwater flow and contamination studies
- Radioactive element chemistry and processing
- Clay minerals and soil interactions
- Soil and Unsaturated Flow
- Hydrocarbon exploration and reservoir analysis
- Nuclear materials and radiation effects
- Geochemistry and Geologic Mapping
- Mine drainage and remediation techniques
- Hydraulic Fracturing and Reservoir Analysis
- Iron oxide chemistry and applications
- Geochemistry and Elemental Analysis
- Geological and Geochemical Analysis
- Grouting, Rheology, and Soil Mechanics
- Building materials and conservation
- Radioactive contamination and transfer
- Drilling and Well Engineering
- Rock Mechanics and Modeling
- Magnesium Oxide Properties and Applications
- Chemical Synthesis and Characterization
- Extraction and Separation Processes
- Geological Modeling and Analysis
- Coal and Its By-products
- Layered Double Hydroxides Synthesis and Applications
Bureau de Recherches Géologiques et Minières
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007-2023
CEA Paris-Saclay
2007-2023
Belgian Nuclear Research Centre
2019
Université d'Évry Val-d'Essonne
2008
Centre National de la Recherche Scientifique
2002-2008
Direction des énergies
2008
University of Geneva
2007
FZI Research Center for Information Technology
2003-2005
Agence Nationale pour la Gestion des Déchets Radioactifs
2002-2004
Smectite illitization is a common mineralogical reaction occurring during the burial diagenesis of clay-rich sediments and shales, has thus attracted sustained interest over last fifty years. Prior studies have concluded that smectite proceeds through steady set homogeneous reactions involving intermediate mixed layers varying compositions. In these structures, illite or, more generally, expandable (I Exp layers, respectively) coexist among same crystallites giving rise to non-periodic...
X-ray diffraction (XRD) patterns were calculated and compared to literature data with the aim of investigating crystal structure nanocrystalline calcium silicate hydrates (C-S-H), main binding phase in hydrated Portland cement pastes. Published XRD from C-S-H Ca/Si ratios ranging ∼ 0.6 1.7 are fully compatible turbostratic tobermorite. Even at a ratio close or slightly higher than that jennite (Ca/Si = 1.5) this latter mineral, which is required some models describe C-S-H, not detected...
The structure of nanocrystalline calcium silicate hydrates (C-S-H) having Ca/Si ratios ranging between 0.57 ± 0.05 and 1.47 0.04 was studied using an electron probe micro-analyser, powder X-ray diffraction, 29Si magic angle spinning NMR, Fourier-transform infrared synchrotron absorption spectroscopies. All samples can be described as defective tobermorite. At low ratio, the Si chains are defect free Q3 Q2 environments account, respectively, for up to 40.2 1.5% 55.6 3.0% total Si, with part...
The structural evolution of nanocrystalline calcium silicate hydrate (C-S-H) as a function its to silicon (Ca/Si) ratio has been probed using qualitative and quantitative X-ray atomic pair distribution analysis synchrotron scattering data. Whatever the Ca/Si ratio, C-S-H structure is similar that tobermorite. When increases from ∼0.6 ∼1.2, Si wollastonite-like chains progressively depolymerize through preferential omission bridging tetrahedra. approaches ∼1.5, nanosheets portlandite are...
porousMedia4Foam is a package for solving flow and transport in porous media using OpenFOAM® - popular open-source numerical toolbox. We introduce highlight the features of new generation hydro-geochemical module implemented within porousMedia4Foam, which relies on micro-continuum concept makes it possible to investigate processes occurring at multiple scales i.e. pore-scale, reservoir-scale hybrid-scale. Geochemistry handled by third party (e.g. PHREEQC) that coupled solver OpenFOAM®....
Abstract Data science (digitalisation and artificial intelligence) became more than an important facilitator for many domains in fundamental applied sciences as well industry is disrupting the way of research already to a large extent. Originally, data were viewed be well-suited, especially, data-intensive applications such image processing, pattern recognition, etc. In recent past, particularly, data-driven physics-inspired machine learning methods have been developed extent that they...
The Cement–Opalinus Clay Interaction (CI) Experiment at the Mont Terri rock laboratory is a long-term passive diffusion–reaction experiment between contrasting materials of relevance to engineered barrier systems/near-field for deep disposal radioactive waste in claystone (Opalinus Clay). Reaction zones interfaces Opalinus with two different types concrete (OPC and "low-pH"/ESDRED) were examined by sampling after 2.2 4.9 years. Analytical methods included element mapping (SEM, EPMA), select...
In geochemically perturbed systems where porewater and mineral assemblages are unequilibrated the processes of precipitation dissolution may change important transport properties such as porosity pore diffusion coefficients. These reactions might alter sealing capabilities rock by complete pore-scale (cementation) system or opening new migration pathways through dissolution. actual 1D continuum reactive codes coupling is generally accomplished empirical Archie's law. There very little...
A five-year-old interface between a Low Alkali Concrete (LAC) formulation (CEM III/B containing 66% slag and 10% nano-silica) Opalinus Clay (OPA) from field experiment at Mont Terri Underground Rock Laboratory in Switzerland (Jenni et al., 2014) has been studied to decipher the textural, mineralogical chemical changes that occurred two reacting materials. Reactivity LAC concrete OPA is found be limited ∼1 mm thick highly porous (ca. 75% porosity) white crust developed on side. Quantitative...
Water in calcium silicate hydrate (C-S-H) is one of the key parameters driving macroscopic behavior cement materials for which water vapor partial pressure has an impact on Young's modulus and volumic properties. Several samples C-S-H with a bulk Ca/Si ratio ranging between 0.6 1.6 were characterized to study their dehydration/hydration under water-controlled conditions using29Si NMR, adsorption volumetry, X-ray diffraction, Fourier-transform near-infrared diffuse reflectance various...
<title>Abstract</title> Advances in geothermal technology and the global capacity for power heat are growing, yet its role transition to sustainable energy systems remains notably underexplored. In this review, we find that many existing system models rely on simplified techniques fail adequately address complexities of exploration uncertainties nonlinear drilling costs. We synthesize key data sources identify good modeling practices plants, examining fixed versus variable depths, as well...
Sorptive fractionation of Suwannee River Fulvic Acid (SRFA) and Purified Aldrich Humic (PAHA) on α-Al2O3 at pH 6 was probed in the supernatant using different spectroscopic techniques. Comparison dissolved organic carbon (DOC) analysis with UV/vis spectrophotometric measurements 254 nm, including specific UV absorbance (SUVA) calculation, revealed a decrease chromophoric compounds for nonsorbed extracts after 24 h contact time. This fractionation, only observable below certain ratio between...