13 results on '"Bourbon, Xavier"'
Search Results
2. Polycondensation reaction effect on the thermal behavior of metakaolin-based potassium geopolymers
- Author
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Scanferla, Paolo, Gharzouni, Ameni, Texier-Mandoki, Nathalie, Bourbon, Xavier, de la Plaza, Isabel Sobrados, and Rossignol, Sylvie
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- 2023
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3. Effects of potassium-silicate, sands and carbonates concentrations on metakaolin-based geopolymers for high-temperature applications
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Scanferla, Paolo, Gharzouni, Ameni, Texier-Mandoki, Nathalie, Bourbon, Xavier, and Rossignol, Sylvie
- Published
- 2022
- Full Text
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4. Deciphering mineralogical changes and carbonation development during hydration and ageing of a consolidated ternary blended cement paste
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Claret, Francis, Grangeon, Sylvain, Loschetter, Annick, Tournassat, Christophe, De Nolf, Wout, Harker, Nicholas, Boulahya, Faiza, Gaboreau, Stéphane, Linard, Yannick, Bourbon, Xavier, Fernandez-Martinez, Alejandro, and Wright, Jonathan
- Subjects
cement ,synchrotron radiation ,X-ray diffraction tomography ,carbonation ,porosity ,calcite ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Condensed Matter Physics ,Physical Chemistry (incl. Structural) - Abstract
To understand the main properties of cement, a ubiquitous material, a sound description of its chemistry and mineralogy, including its reactivity in aggressive environments and its mechanical properties, is vital. In particular, the porosity distribution and associated sample carbonation, both of which affect cement's properties and durability, should be quantified accurately, and their kinetics and mechanisms of formation known both in detail and in situ. However, traditional methods of cement mineralogy analysis (e.g. chemical mapping) involve sample preparation (e.g. slicing) that can be destructive and/or expose cement to the atmosphere, leading to preparation artefacts (e.g. dehydration). In addition, the kinetics of mineralogical development during hydration, and associated porosity development, cannot be examined. To circumvent these issues, X-ray diffraction computed tomography (XRD-CT) has been used. This allowed the mineralogy of ternary blended cement composed of clinker, fly ash and blast furnace slag to be deciphered. Consistent with previous results obtained for both powdered samples and dilute systems, it was possible, using a consolidated cement paste (with a water-to-solid ratio akin to that used in civil engineering), to determine that the mineralogy consists of alite (only detected in the in situ hydration experiment), calcite, calcium silicate hydrates (C-S-H), ettringite, mullite, portlandite, and an amorphous fraction of unreacted slag and fly ash. Mineralogical evolution during the first hydration steps indicated fast ferrite reactivity. Insights were also gained into how the cement porosity evolves over time and into associated spatially and time-resolved carbonation mechanisms. It was observed that macroporosity developed in less than 30 h of hydration, with pore sizes reaching about 100-150 µm in width. Carbonation was not observed for this time scale, but was found to affect the first 100 µm of cement located around macropores in a sample cured for six months. Regarding this carbonation, the only mineral detected was calcite.
- Published
- 2018
5. Mineralogical and geochemical composition of a cementitious grout and its evolution during interaction with water.
- Author
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Grangeon, Sylvain, Debure, Mathieu, Montouillout, Valerie, Elkaim, Erik, Lerouge, Catherine, Maubec, Nicolas, Michau, Nicolas, Bourbon, Xavier, Martin, Christelle, Cochepin, Benoit, and Marty, Nicolas
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GYPSUM ,GEOLOGICAL repositories ,RADIOACTIVE waste repositories ,CALCIUM silicate hydrate ,GROUTING ,GIBBSITE ,CARBON steel corrosion ,RADIOACTIVE waste disposal - Abstract
In the present study, the chemical composition, mineralogy, and mechanisms of alteration of a cementitious grout based on a CEM III/C with addition of smectite, hydrotalcite, and silica fume, are studied using a combination of chemical and physical methods. This material was designed in the context of geological repository of radioactive wastes, with a twofold aim: first, to fill the technical voids left by drilling operations at the interface between the geological formation and the disposal galleries. Second, to neutralize a potential acidic transient due to pyrite oxidation, and to create an environment that favors low corrosion rates of carbon steels. The grout is mainly composed of calcium silicate hydrates having a Ca/Si ratio of ~0.8, incorporating Al in the bridging site of the Si chains (C-A-S-H), and accounting for 29–36 wt.% of the sample. It also contains silica fume (38–48 wt.%), smectite with interlayer Na (11–17 wt.%), hydrotalcite with interlayer CO
3 2− (3–4 wt.%), and lower amounts of portlandite, calcite, and possibly gibbsite and gypsum. Upon alteration by water in a flow-through reactor, the main modifications affecting the sample are calcite and gypsum dissolution, hence releasing aqueous Ca2+ that is adsorbed in smectite interlayer by replacing Na+ , and stoichiometric C-A-S-H dissolution. The evolution of solution chemistry and of the solid phase composition are reproduced successfully using a thermokinetic model. [ABSTRACT FROM AUTHOR]- Published
- 2024
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6. Mechanical properties and self-sensing ability of amorphous metallic fiber-reinforced concrete
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Bouillard Théophile, Turatsinze Anaclet, Balayssac Jean-Paul, Toumi Ahmed, Helson Olivier, and Bourbon Xavier
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amorphous metallic fibers ,corrosion-resistance ,residual strength ,smart concrete ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
The aim of this research work is to develop a corrosion resistant fiber-reinforced concrete for radioactive waste disposal structures. In the case of precast concrete, the use of fibers is a solution to reduce the amount of steel reinforcement while maintaining high mechanical performance and durability. Concrete has a low strain capacity and a limited tensile strength. Generally, reinforcing bars are used to ensure tensile strength. A fiber reinforcement can also help to overcome such a mechanical weakness. For this purpose, an amorphous metallic fiber (AMF), corrosion-resistant and suitable for application in severe environment conditions are used. The fresh and hardened properties of the self-compacting fiber reinforced concrete (SCFRC) are studied with volume fractions of AMF of 0% and 0.28% and with three different aspect ratios (82, 114 and 123). Flexural tensile tests according to European standard EN 14651 are conducted to quantify the contribution of the fiber reinforcement on the residual flexural tensile strength. Since these fibers are electrically conductive, they are also tested to design a smart concrete. For this purpose, electrical resistance of specimens submitted to cyclic flexural loadings are monitored using a Wheatstone bridge.
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- 2022
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7. The Use of Callovo-Oxfordian Argillite as a Raw Material for Portland Cement Clinker Production
- Author
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Kleib, Joelle, primary, Amar, Mouhamadou, additional, Aouad, Georges, additional, Bourbon, Xavier, additional, Benzerzour, Mahfoud, additional, and Abriak, Nor-Edine, additional
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- 2022
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8. Corrosion of carbon-steel casing used in deep geological radioactive waste storage
- Author
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Vernouillet, Annabelle, Carré, Charlotte, Neff, Delphine, Bourbon, Xavier, Maillot-Deydier, Valérie, Michau, Nicolas, Dillmann, Philippe, Laboratoire Archéomatériaux et Prévision de l'Altération (LAPA - UMR 3685), Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M) (NIMBE UMR 3685), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), IRAMAT - Laboratoire Archéomatériaux et Prévision de l'Altération (IRAMAT-LAPA), Institut de Recherche sur les Archéomatériaux (IRAMAT), Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Belfort-Montbeliard (UTBM)-Université d'Orléans (UO)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), and Palacin, Serge
- Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry ,[CHIM.MATE]Chemical Sciences/Material chemistry - Abstract
International audience; Deep geological storage is considered by several countries to isolate highly and intermediate radioactive long-lived waste for as long as they are dangerous for humankind and the environment (over 100 000 years) [1]. The French National Waste Management Agency (ANDRA) started building in 2000 an underground laboratory (Bure, Haute-Marne, France) in order to test the feasibility of such a solution. A multibarrier system was designed to confine the radionuclides. The waste is to be calcinated and vitrified before being put in a stainless steel container enclosed in a carbon-steel overpack. The containers are then placed in a horizontal micro-tunnel with a carbon steel casing. The host rock, the callovo-oxfordian claystone (Cox), 500 m underground, was chosen for its low permeability, safe confinement properties and stable pH [2]. To evaluate the degradation of the carbon steel casing over time this study focuses on its corrosion in contact with the Cox as well as with the cement grout used to isolate the casing from the Cox. The resistance of carbon-steel in contact with Cox was tested under aerated conditions, at 50°C, for 7 years in a simplified laboratory experiment. Claystone from Bure and an electrolyte which composition was adjusted to match the Cox poral water were used. The corrosion rate and products are compared to those obtained for the corrosion of carbon-steel in contact with cement in similar conditions as well as archaeological artefacts buried in claystone environments [3]. A multi-scale and multi-technique approach, including SEM-EDX, Raman spectroscopy and STXEM, was used to determine the nature and structure of the corrosion products and to better understand the mechanisms involved in the observed degradation.
- Published
- 2022
9. Mechanical properties and self-sensing ability of amorphous metallic fiber-reinforced concrete.
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Alexander, M.G., Beushausen, H., Dehn, F., Ndawula, J., Moyo, P., Bouillard, Théophile, Turatsinze, Anaclet, Balayssac, Jean-Paul, Toumi, Ahmed, Helson, Olivier, and Bourbon, Xavier
- Published
- 2022
- Full Text
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10. Effect of water on the thermal properties of argillite – based geopolymers
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Rossignol Sylvie, Gharzouni Ameni, Bourbon Xavier, Tognonvi Tohoue Monique, Petlitckaia Svetlana, and Texier-Mandoki Nathalie
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010302 applied physics ,Materials science ,Thermal resistance ,02 engineering and technology ,Thermal treatment ,engineering.material ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Wollastonite ,Electronic, Optical and Magnetic Materials ,law.invention ,Geopolymer ,Compressive strength ,law ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,engineering ,Calcination ,Arcanite ,Composite material ,0210 nano-technology ,Leucite - Abstract
This study focuses on the effect of consolidation time and water immersion on the thermal behavior of geopolymers based on mixture of kaolin and argillite calcined at 750 °C. In order to assess the fire resistance water and thermal treatment at 1000 °C were performed. Compressive strength and structural changes of the samples before and after treatment were investigated. It was demonstrated that the age of geopolymer (7, 14 and 28 days of consolidation) does not have a significant effect on strength neither before (22 MPa) nor after (30 MPa) thermal treatment. The results also show that all samples present higher compressive strength ratio (σafter/σbefore ~ 1.4). The geopolymer samples do not exhibit structural variation over the time in agreement with the compressive strength values. The good performance of compressive strength after 1000 °C was due to the formation of the same crystalline phases after heat treatment such as zeolite (4%) and leucite type phases (62%) and wollastonite (18%) which were also evidenced by SEM observations. The decrease of compressive strength after water immersion (16 MPa) and after thermal treatment (19 MPa) was explained by the decrease of arcanite by 70% as well as the amorphous phase content. Nevertheless, leucite (46%) and wollastonite (24%) were formed. In conclusion, the use of mixture of kaolin and argillite calcined at 750 °C leads to water and thermal resistant geopolymers.
- Published
- 2020
11. On shrinkage and structure changes of pure and blended Portland concretes
- Author
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Zhang, Yao, primary, Davy, Catherine A., additional, Tricot, Gregory, additional, Albert-Mercier, Cyrille, additional, Henry, Natacha, additional, Bertier, Pieter, additional, Cazaux, Frédéric, additional, Damidot, Denis, additional, and Bourbon, Xavier, additional
- Published
- 2017
- Full Text
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12. Orthotropic damage coupled with localized crack reclosure processing Part II: Applications
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Sellier, Alain, Casaux-Ginestet, Géraldine, Buffo-Lacarriere, Laurie, Bourbon, Xavier, Laboratoire Matériaux et Durabilité des constructions (LMDC), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), and Université de Toulouse (UT)
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Reinforced concrete beam test ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,Anisotropic damage ,Notched beam test ,Biaxial test ,Localization ,Split test ,Shear test ,Cyclic loading ,Crack reclosure ,Concrete - Abstract
WOS:000316092200011; International audience; This paper is concerned with the application of the orthotropic damage model described in the accompanying paper (Part I). The part I of the paper deals with several theoretical cases illustrating model's abilities to treat unilateral behaviour aspect, anisotropic loading and non radial loading pass. The second part illustrates the model's capabilities to simulate traditional laboratory tests using 3D FEM which include three points bending tests of notched beams, and examples which involve curved crack propagation, strongly anisotropic loading, and multiple cracks propagation in reinforced concrete beams. (C) 2012 Elsevier Ltd. All rights reserved.
- Published
- 2013
13. Les Accords secrets franco-anglais de décembre 1940 / Prince Xavier de Bourbon
- Author
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Bourbon, Xavier de (Prince). Auteur du texte and Bourbon, Xavier de (Prince). Auteur du texte
- Abstract
Contient une table des matières, Avec mode texte
- Published
- 1949
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