Franck Agostini

Franck Agostini
École Centrale de Lille | EC Lille · Génie Civil

About

42
Publications
4,816
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
713
Citations

Publications

Publications (42)
Article
Full-text available
In the context of salt cavern applications, this experimental study is dedicated to the characterization of fluid transfer and poromechanical properties of salt rock under isotropic and/or deviatoric stresses. Triaxial test was used to investigate permeability variation with deviatoric stress and time, and simultaneously to get damaged sample. Unia...
Chapter
In the framework of studies for the disposal of radioactive waste, ONDRAF/NIRAS, the Belgian National Agency for Radioactive Waste and enriched Fissile Materials investigates the option of a geological repository. In a geological repository, the waste is sidelined within a deep and stable geological layer, named host rock, behind a whole series of...
Article
Full-text available
The effects of confining pressure are investigated for two samples of a macro-cracked concrete. Samples are first macro-cracked with a splitting tensile strength test (Brazilian) technique. Gas permeability is continually measured under increasing (or decreasing) confining pressure, whereas crack closure (or opening) is recorded with an LVDT (Linea...
Article
Concrete shrinkage and creep under variable hydric conditions are important factors for the safety and durability of concrete especially in nuclear reactor or nuclear waste storage background. A large (and long – more than 900 days) experimental campaign, conducted on two different concretes, has therefore been designed to study the strains of non...
Article
Full-text available
Porosity and permeability are the two most important characteristics of underground gas storage in sandstone reservoirs. Injection of gas into reservoir rocks will cause rock deformation. The deformation will influence the porosity and permeability properties of the rocks. We investigate the evolution of these two properties of storage sandstone by...
Article
Full-text available
This experimental study is dedicated to the measurements of gas permeability under confinement and to preliminary characterizations of salt rock poromechanical behavior. Salt porosity and permeability under loading are recorded either with argon or hydrogen gas. Permeability measurements carried out with both gases led to similar values. Poromechan...
Article
Full-text available
Permeability and porosity are two crucial properties related to underground gas storage. This research investigates the permeability and porosity evolution of a Vosges sandstone under different stress paths. Under hydrostatic stress, the influence of irreversible deformation on permeability is more significant than on porosity. The permeability is...
Article
Full-text available
This experimental study determines H2 transfer properties of High Density PolyEthylene (HDPE) or epoxy membranes. Two different techniques are compared. The pressure gradient technique is analyzed for permeability or diffusion. Results show that the main phenomenon involved is diffusion. The second technique involves a gas concentration gradient. A...
Conference Paper
Full-text available
Cobourg limestone formation is proposed as a possible repository site for nuclear wastes in Canada. This limestone displays significant heterogeneity, characterized by light grey calcite nodular regions, interspersed with dark grey calcite-dolomite-quartz partings containing a clay component. The mineral composition is dominated by calcite, with so...
Article
France has a total of 58 nuclear reactors, which produce 75% of its electricity. The second-generation reactors are protected by two concentric concrete envelopes, which are separated by an annular space. Every ten years, leakage tests are performed, by inflating the confinement structure with pressurized dry air. The confining structures of severa...
Article
Full-text available
Poromechanical properties of a sandstone from an underground gas storage site are investigated with the use of a neutral gas to control the pore pressure. The poroelastic theory of anisotropic medium is used to evaluate elastic properties and coupling coefcients under different stress states. In-situ CT observations have been made under uniaxial com...
Article
A normalized mortar was severely heated at different temperatures up to 600 °C that led to a strong material degradation linked to its loss of water and to the Portlandite decomposition. These heating were followed by pure water rehydration as these operations have proven to be efficient as regards the recovery in the transfer properties. The prese...
Article
The pore structure characteristics, such as porosity, pore size distribution, and pore connectivity, of tight gas sandstone are crucial for evaluating its reservoir capacity. However, due to multiscale pore size and various pore types in tight sandstone, the characterization of the pore structure can be optimized by combining the multiple fluid inv...
Article
This note deals with the study of stress-sensitive relative permeability experimentally observed in low permeable sandstones. These sandstones are made up of quartz grains surrounded by permeable interfaces between grains and pores. A micromechanical model of relative permeability behaviour under loading highlights the role of the closure of interf...
Article
Argillaceous rocks have long been selected as privileged host rock candidates for the nuclear waste disposal. For the sake of evaluating the sealing capacity of these natural barriers, one urgent issue is to study the poromechanical properties of them in the long-term gas migration process. As the key parameter of poroelasticity, Biot’s tensor of a...
Conference Paper
The main purpose of this contribution is to study the effects of adsorption-induced swelling on the porosity, permeability and poromechanical properties of Callovo-Oxfordian (COx) argillite. To verify the adsorption effects, three kinds of gases with different adsorption capacities, helium, argon, carbon dioxide, were used. The results show that th...
Presentation
Full-text available
All civil engineering structures include seals to ensure water tightness. Seals have to be waterproof and seismic resistant since they are located between two concrete structures. Seals are usually rubbers as neoprene, polyurethane, or polydimethylsiloxane (Silicone). In order to guarantee the longevity of civil engineering structure, studies devot...
Article
Tight sandstones samples from an Ordovician gas field in Algeria studied in this work are characterized by low connected porosity (below 10%) and low gas permeability (below 0.1 mD under ambient condition). Under confining pressure (up to 40 MPa) the permeability has decreased by more than 80% while the porosity goes down between 10% and 25%. Regar...
Article
Full-text available
The geomechanical behaviour of a specific type of sandstone is investigated using tri-axial compression tests, a hydrostatic compression test to measure Biot’s coefficient, tri-axial tests with pressurised gas, and permeability tests under deviatoric stress. The tri-axial compression tests reveal a nonlinear stress–strain relationship at low confin...
Conference Paper
Full-text available
The recent construction of the VeRCoRs mock-up (at EDF Lab Les Renardières, near Fontainebleau, France) enables to highlight significant advances in temperature, strain and moisture monitoring in concrete of the inner pre-stressed containment. The “gas-pressure-pulse-decay” (i.e. “pulse”) technology has been setup in this structure since September...
Article
Connected porosity and dry gas permeability at 5 MPa hydrostatic stress have been measured for thirteen tight gas sandstone samples originating from a Rotliegend sandstone reservoir in Germany. The samples have then been preserved into hermetic chambers at fixed relative humidity (RH) values, until mass (and water saturation level) stabilisation. T...
Article
We assess the durability of an Ultra High Performance Fiber Reinforced Concrete (UHPFRC) after accelerated aging, i.e. after partial drying, or 105 °C oven-drying (dry reference state), 200, 300 or 400 °C heat-treatment, or progressive splitting (Brazilian test). Our key experimental tool is gas permeability Kgas under varying confinement Pc, coupl...
Article
Full-text available
The aim of our experimental study is to characterize experimentally the petro-physical properties of a set of sandstones originating from different depths from a single tight gas field, in order to improve our knowledge on their gas recovery potential. The initial characterization of these sandstones is performed in the dry state, and in the “as re...
Article
Water saturation is a key factor to assess the safety of concrete storage structures of radioactive waste. Our laboratory has developed a nondestructive method of measuring the in situ water saturation. A pulse sensor, designed to measure effective gas permeability, is firstly casted in the concrete structure. The in situ gas permeability is then p...
Article
Full-text available
Our experimental study relates to several sandstone samples originating from a tight gas field explored by GDF/Suez. The aim of the study is to characterize experimentally the petro-physical properties of these materials, in order to improve our knowledge on their gas recovery potential. The initial characterisation of these sandstone samples is pe...
Article
Cette étude s’inscrit dans une démarche plus générale dont le but est d’améliorer la caractérisation environnementale de déchets valorisés dans le domaine du Génie Civil. Cet article présente la mise au point d’une méthode d’évaluation des caractéristiques hydrodynamiques d’un échantillon monolithique lors d’un essai de percolation. L’étude vise à...
Article
This experimental study investigates the performance of mortars added with water-saturated treated sediment aggregates (TSA), used as sand substitution (0, 33, 66 and 100% sand volume). As compared to industrial practice, two extreme curing conditions are used, either water immersion (most favorable to cement hydration), or air curing (highly defic...
Article
This study is an original contribution to the understanding of the hydraulic behaviour of cement-based materials when subjected to temperature rises. Permeability is measured continuously during heating by injecting inert gas into a sample at homogeneous temperature. Using a confining cell especially designed in our laboratory, the sample is submit...
Article
The paper presents results of studies on the valorisation of polluted river sediments from the North region of France. The first objective of this study is to validate the treatment of polluted sediments with the Novosol® process. This process is based on the stabilization of heavy metals in the solid matrix by phosphatation and the destruction of...
Article
The disposal of contaminated dredged material has become an economical and environmental issue. Firstly, this study presents the Novosol® process which was used for the treatment of polluted sediments. This process is based on the stabilisation of heavy metals and on the thermal elimination of organic matter. A physical characterization of the proc...
Article
Two mortars, differencing mainly in their initial porosity, were degraded by the use of a chemically accelerated process with ammonium nitrate solution. To specifically study the leached material, the chemical attack was undertaken on thin walled tubes. The leaching effects were evaluated by studying variations in mechanical and hydraulic propertie...
Article
Dredging is a necessary maintenance operation on harbours, access channels and rivers. Dredged volumes are significant and heavy metals and organic pollutants contaminate a large part of them. Their management has become an environmental and economical concern for a large number of countries. The Novosol® process, developed by Solvay, offers a reli...
Article
Full-text available
La gestion des transferts hydriques au sein des coeurs (AME) des piles à combustible à hydrogène de type PEFMC est aujourd'hui une question critique vis-à-vis de ses performances. Les propriétés de transfert convectif en régime d'écoulement monophasique (au gaz) sont connues, dans le plan et perpendiculairement au plan des supports de GDL, partie c...

Network

Cited By

Projects

Projects (3)
Project
- Identify the degradation mechanism (water diffusion, structural relaxation, oxidation) and proposing the associated kinetic law for epoxy coatings, from experimental and theoretical( quantum chemistry) approach, and focus on the inreraction between chemical (oxidation) and physical (structural relaxation or water diffusion) interaction. - Develop a numerical modeling of the diffusion-reaction coupling for predicting the changes (at structural level) at any time and polymer depth. - Establish structure-properties relationships giving the consequences of ageing on physicochemical, physical and mechanical properties, and subsequent changes of these latter within exposure time using DMA, BDS spectrosopy, flash DSC (for structural relaxation) - Determine end-of-life criteria allowing then the determination of exposure time after which mechanical and barrier properties fall beyond an acceptable limit basing on mechanical tests on expoyx samples and epoxy + concrete assemblies (close to real case materials in the case of expoy waterproofing for civil engineering
Project
This project aims at monitoring strains, tempertature and concrete water content within the inner prestressed concrete wall of a nuclear containment (EPR at Flamanville, France). This is a part of the qualification process to improve the monitoring system for the next nuclear plants.