Search

Your search keyword '"Bourbon, Xavier"' showing total 45 results
Start Over Author "Bourbon, Xavier" Publication Year Range Last 10 years
45 results on '"Bourbon, Xavier"'

5. Mineralogical and geochemical composition of a cementitious grout and its evolution during interaction with water.

Author

Grangeon, Sylvain, Debure, Mathieu, Montouillout, Valerie, Elkaim, Erik, Lerouge, Catherine, Maubec, Nicolas, Michau, Nicolas, Bourbon, Xavier, Martin, Christelle, Cochepin, Benoit, and Marty, Nicolas

Subjects
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 CO32− (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
Full Text
View/download PDF

6. Deciphering mineralogical changes and carbonation development during hydration and ageing of a consolidated ternary blended cement paste

Author

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

7. Investigation of the effect of γ irradiations on the mechanical and physico-chemical properties of cementitious materials: from the nanoscale to mortars’scale

Author

Robira, Maxime, Hilloulin, Benoît, Loukili, Ahmed, Potin, Gildas, Bourbon, Xavier, Abdelouas, Abdessalam, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Ha-Minh, Cuong, editor, Dao, Dong Van, editor, Benboudjema, Farid, editor, Derrible, Sybil, editor, Huynh, Dat Vu Khoa, editor, and Tang, Anh Minh, editor

Published
2020
Full Text
View/download PDF

15. Mechanical properties and self-sensing ability of amorphous metallic fiber-reinforced concrete

Author

Bouillard Théophile, Turatsinze Anaclet, Balayssac Jean-Paul, Toumi Ahmed, Helson Olivier, and Bourbon Xavier

Subjects
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.

Published
2022
Full Text
View/download PDF

16. Hydrogen production through aluminium corrosion in a cement‐based matrix.

Author

Bulidon, Nicolas, Pelissier, Krystel, Boissy, Clément, Mendibide, Christophe, Maillot, Valérie, Bourbon, Xavier, and Crusset, Didier

Subjects
HYDROGEN production, ALUMINUM, RADIOACTIVE wastes, RADIOACTIVE waste disposal, ALUMINUM cans, HYDROGEN as fuel
Abstract

In France, deep geological disposal is considered for the storage of high and intermediate‐level long‐lived radioactive wastes. For aluminium, the possibility to encapsulate the wastes in a cement‐based matrix is studied. However, cement being an alkaline environment, aluminium can lose its passivity, starts to corrode leading to hydrogen evolution in the infrastructures and generate a possible explosive hazard after decades of storage if hydrogen can accumulate somewhere in the facility. It is therefore necessary to study the corrosion behaviour of aluminium in the different cements considered for the encapsulation to estimate the possible amount of hydrogen that could be generated through corrosion and design the cement capsules accordingly. This work mainly focused on the reaction occurring at the aluminium‐cement interface. Raman spectroscopy did not highlight significant differences in the nature of the corrosion products forming at the cement/aluminium interface, leading to the conclusion that it is not the chemistry of the cement that is the key factor controlling the corrosion rate but rather the physical properties of the cement matrix. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

19. Corrosion of carbon-steel casing used in deep geological radioactive waste storage

Author

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

23. Experimental investigation of the first desorption isotherm of a high performance concrete with thin sliced samples

Author

Wu, Qier, Rougelot, Thomas, Burlion, Nicolas, and Bourbon, Xavier

Subjects
Concrete -- Analysis -- Mechanical properties -- Chemical properties, Radioactive wastes -- Waste management, Business, Construction and materials industries
Abstract

ABSTRACT The aim of present study is to determine experimentally the first desorption isotherm of a high performance concrete based on CEM I cement for long-term underground nuclear waste storage [...]

Published
2014
Full Text
View/download PDF

24. Role of cations on the dissolution mechanism of kaolinite in high alkaline media

Author

N'Guessan, Noel Essey, primary, Joussein, Emmanuel, additional, Courtin-Nomade, Alexandra, additional, Paineau, Erwan, additional, Soubrand, Marilyne, additional, Grauby, Olivier, additional, Robin, Valentin, additional, Cristina, Coelho Diogo, additional, Vantelon, Delphine, additional, Launois, Pascale, additional, Fondanèche, Patrice, additional, Rossignol, Sylvie, additional, Texier-Mandoki, Nathalie, additional, and Bourbon, Xavier, additional

Published
2021
Full Text
View/download PDF

25. Alteration of vitrified intermediate level radioactive wastes in alkaline media: Effect of cementitious materials, pH and temperature

Author

Suzuki-Muresan, Tomo, Abdelouas, Abdesselam, Landesman, Catherine, Ait Chaou, Abdel, El Mendili, Yassine, ribet, solange, Perrigaud, Katy, Shitara, D., Bourbon, Xavier, Martin, Christelle, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, [CHIM.RADIO]Chemical Sciences/Radiochemistry, [SDE.ES]Environmental Sciences/Environmental and Society, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

28. Effect of water on the thermal properties of argillite – based geopolymers

Author

Rossignol Sylvie, Gharzouni Ameni, Bourbon Xavier, Tognonvi Tohoue Monique, Petlitckaia Svetlana, and Texier-Mandoki Nathalie

Subjects
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

30. Corrosion behavior of aluminum alloy 5754 in cement‐based matrix‐simulating nuclear waste disposal conditions.

Author

Mendibide, Christophe, Dusquesnes, Vincent, Deydier, Valérie, Bourbon, Xavier, and Crusset, Didier

Subjects
RADIOACTIVE waste disposal, ALUMINUM alloys, REFUSE containers, RADIOACTIVE wastes, PACKAGING waste, HYDROGEN production
Abstract

Depending on the lifetime and level of radioactivity of radioactive wastes, different disposal facilities are considered. Though low‐ and intermediate‐level short‐lived waste can be disposed in surface disposal facilities, deep geological disposal is considered for high‐ and intermediate‐level long‐lived waste. In France and Belgium, long‐term disposal is studied in clay host rock media. For aluminum, the disposal concept is based on encapsulation of the waste in a cement‐based matrix. It is also well‐known that aluminum is prone to severe corrosion in sufficiently alkaline environments leading to possible hydrogen production. To ensure the safety of the disposal facilities and the integrity of the cement capsules, the amount of aluminum that is disposed in each waste package must be specified and is limited to mitigate the level of hydrogen production by aluminum corrosion. In the present study, the corrosion resistance of an aluminum alloy (grade EN‐AW‐5754/H111) in two different cement matrices was studied in different configurations at room temperature. In each case, the evolution of hydrogen production was monitored to address the corrosion rate variation versus time. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

31. Corrosion-Induced Degradation of Reinforced Concrete Elements: Preliminary Results, in: Service Life and Durability of Reinforced Concrete Structures

Author

LOUKIL, Olfa, Adelaide, Lucas, Bouteiller, Véronique, Chaussadent, Thierry, Ragueneau, Frédéric, Bourbon, Xavier, Trenty, Laurent, Sécurité et Durabilité des Ouvrages d'Art (IFSTTAR/MAST/SDOA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Communauté Université Paris-Est, Comportement Physico-chimique et Durabilité des Matériaux (IFSTTAR/MAST/CPDM), École normale supérieure - Cachan (ENS Cachan), and Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA)

Subjects
FISSURATION, REINFORCED CONCRETE, CORROSION, CRACKS, BETON RENFORCE, RUST LAYER, ELECTROCHEMISTRY, ELECTROCHIMIE, [SPI.MAT]Engineering Sciences [physics]/Materials
Abstract

Selected Papers of the 8th International RILEM PhD Workshop, Marne-la-Vallée, FRANCE, 26-/09/2018 - 27/09/2016; Steel reinforcement corrosion is the predominant cause of deterioration of reinforced concrete structures. Corrosion products can induce concrete cracking, loss of adhesion at the steel-concrete interface, loss of reinforcing bar cross-section, and even spalling of the concrete cover. This study investigates the durability problems related to corrosion of the reinforcement by combining experimental and numerical approaches. This paper particularly focuses on the experimental methodology used for the evaluation of the development over time of damages (steel corrosion products formation and crack patterns) induced by accelerated corrosion tests. The accelerated corrosion tests were carried out by applying a constant current between a reinforcement bar used as an anode and an external counter electrode. The corrosion process was monitored by measuring relevant electrochemical parameters, i.e. free corrosion potential, polarization resistance and electrical concrete resistance. The aim of this paper is to characterize the crack pattern (orientation, length and width) and the corrosion products layers according to the current density and the time.

Published
2016

33. Experimental study of corrosion-induced degradation of reinforced concrete elements

Author

LOUKIL, Olfa, Adelaide, Lucas, Bouteiller, Véronique, Quiertant, Marc, Chaussadent, Thierry, Ragueneau, Frédéric, Bourbon, Xavier, Trenty, Laurent, Sécurité et Durabilité des Ouvrages d'Art (IFSTTAR/MAST/SDOA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Communauté Université Paris-Est, Expérimentation et Modélisation des Matériaux et des Structures (IFSTTAR/MAST/EMMS), Comportement Physico-chimique et Durabilité des Matériaux (IFSTTAR/MAST/CPDM), Laboratoire de Mécanique et Technologie (LMT), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), RP2-F14099 ANDRA - Etude corrosion béton armé, and Communauté Université Paris-Est-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)

Subjects
CORROSION, CHIMIE, FISSURE, BETON RENFORCE, FER, FISSURATION, ELECTRICITE, BETON ARME DE FIBRES, METHODE DES ELEMENTS FINIS, [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph], PONT, ESSAI ACCELERE, ELEMENTS FINIS (METHODE), ELECTROCHIMIE
Abstract

Corrosion of steel reinforcement is the main cause of damage for reinforced concrete structures. Iron oxides produced during the corrosion process can induce concrete cracking, loss of adhesion at the steel-concrete interface, loss of reinforcing bar cross-section and even spalling of the concrete cover. In the presented research, the durability problems related to the corrosion of the reinforcement are investigated by combining experimental and numerical studies. However, this paper particularly focuses on the experimental methodology used for the time evolution of damages (steel corrosion products formation and crack patterns) induced by the accelerated corrosion test. The accelerated corrosion tests were carried out by applying a constant current between reinforcement used as an anode and a counter electrode. To control the corrosion process, electrochemical parameters (such as free corrosion potential, polarization resistance, electrical concrete resistance) were measured. The purpose of this paper is to determine the width and length of the cracks and their orientation according to the current density and time.

Published
2016

34. Concrete creep modelling for structural applications: non-linearity, multi-axiality, hydration, temperature and drying effects

Author

Sellier, Alain, Multon, Stéphane, Buffo-Lacarrière, Laurie, Vidal, Thierry, Bourbon, Xavier, Camps, Guillaume, Laboratoire Matériaux et Durabilité des constructions (LMDC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), 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)

Subjects
modelling, [SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph], concrete, [SPI.GCIV.MAT]Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction, compression, creep
Abstract

International audience; Concrete creep models have to consider several important phenomena (non-linearity, multi-axiality, hydration, and thermal and drying effects) to be relevant in structural applications. A selection of experimental results of creep tests found in the scientific literature are used to highlight these phenomena. Firstly, regarding the creep rate in different directions of a specimen under various loads, it is shown that creep rate under moderate loading can derive from elastic strains. Secondly, the reason why a Drucker Prager criterion can be chosen to model non-linear creep is discussed. Thirdly the interest of resorting to a creep theory able to decouple ageing (or hydration) effects and consolidation effects is explained. Moreover, interest using a poro-mechanical formulation, in which Biot coefficient depends on stress state, to model drying creep and shrinkage is discussed in the light of short meso-scopic analysis. The effect of temperature on creep is also addressed. The numerical implementation of the proposed modelling is briefly exposed and the model responses are confronted with experimental results.

Published
2016

35. Numerical simulation of sorption-desorption isotherm for cement-based materials

Author

Wu, Qier, Rougelot, Thomas, Burlion, Nicolas, Bourbon, Xavier, Laboratoire de Mécanique de Lille - FRE 3723 (LML), Université de Lille, Sciences et Technologies-Centrale Lille-Centre National de la Recherche Scientifique (CNRS), 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), 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), Université de Toulouse (UT), and Université de Lille, Sciences et Technologies-Ecole Centrale de Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

38. Estimation du volume élémentaire représentatif associé à la détermination d’isothermes de désorption sur bétons

Author

Wu, Qier, Rougelot, Thomas, Burlion, Nicolas, Bourbon, Xavier, Laboratoire de Mécanique de Lille - FRE 3723 (LML), Université de Lille, Sciences et Technologies-Ecole Centrale de Lille-Université de Lille-Centre National de la Recherche Scientifique (CNRS), 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), Université de Lille, Sciences et Technologies-Centrale Lille-Centre National de la Recherche Scientifique (CNRS), 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)

Subjects
[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2015

39. THERMAL RESISTANT ALKALI-ACTIVATED MATERIALS USING ARGILLITE AND TWO TYPES OF SOLUTION.

Author

Dupuy, Colin, Fricheteau, Myriam, Elie, Manon, Gharzouni, Ameni, Texier-Mandoki, Nathalie, Bourbon, Xavier, and Rossignol, Sylvie

Subjects
THERMAL resistance, RADIOACTIVE waste management, ALKALI metals, ARGILLITE, SOLUTION (Chemistry)
Abstract

The French national radioactive waste management agency (Andra) is studying the building of a deep geological disposal for High and Intermediate Level radioactive waste. If accepted, the disposal will lead all along the operating period to the excavation of a large amount of host rock, mainly constituted by argillite. With the aim of using this by-product, alkali-activated materials have been prepared and studied, involving two different alkaline silicate sources (solution and powder). In order to increase the thermal resistance, the addition of sand, as filler, has been studied. A standard test and a thermal shock, both up to 800 °C, are used to study the physical stability of the samples under these thermal constraints. Analyses by XRD and SEM allow correlating the thermal resistance to the structural evolution occurring during the thermal tests. It was shown that the alkaline-silicate solution composition is the main parameter to control the reactions during the thermal treatment. The use of the powder-based solution, containing sodium, leads to the formation of more viscous flow and less crystalline phases, which reduces the thermal resistance and the mechanical properties. The addition of filler in the samples increases the resistance to thermal sudden increase, but is not sufficient to obtain a correct resistance to shock. The utilization of flash-calcined argillite, containing carbonate species, gives a better crystallization during the thermal treatment and leads to more cracks but an increase of the mechanical properties. Using, these different compositions, a value of 20 MPa can be reached after thermal treatment. [ABSTRACT FROM AUTHOR]

Published
2018

40. Representativeness of accelerated carbonation testing of cement pastes

Author

Auroy, Martin, Poyet, Stéphane, Le Bescop, Patrick, Torrenti, Jean Michel, Charpentier, Thibault, Moskura, Mélanie, Bourbon, Xavier, Laboratoire d'Etude du Comportement des Bétons et des Argiles (LECBA), Service d'Etudes du Comportement des Radionucléides (SECR), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Physico-Chimie (DPC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Département Matériaux et Structures (IFSTTAR/MAST), PRES Université Paris-Est-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Laboratoire Structure et Dynamique par Résonance Magnétique (LCF) (LSDRM), 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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-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-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Agence Nationale pour la Gestion des Déchets Radioactifs (ANDRA), Nordic Concrete Federation, Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-PRES Université Paris-Est, 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), and Palacin, Serge

Subjects
[CHIM.MATE] Chemical Sciences/Material chemistry, Cement, [CHIM.MATE]Chemical Sciences/Material chemistry, Mineralogy, Natural and Accelerated Carbonation, Representativeness
Abstract

International audience; Carbonation is one of the main factors involved in corrosion of reinforced concrete structures. The impact of carbonation on the durability of cementitious-based materials is of major importance. However, carbonation is a very slow process (around 0.04% CO2 in the atmosphere). Accelerated test are then commonly used in the laboratory. The representativeness of accelerated test compared to natural carbonation is then an important issue. In this context, this study focuses on the mineralogical characterisation of ancient and recent cement pastes, respectively submitted to natural (in air) and accelerated carbonation (3% CO2). As a major conclusion, the mineralogical changes assessed using complementary techniques have highlighted a good agreement between natural and accelerated carbonation.

Published
2014

45. Sertleşmiş Çimento Pastalarının Karbonatlaşması: Sıcaklığın Etkisi.

Author

Drouet, Emeline, Poyet, Stéphane, Bescop, PatrickLe, Torrenti, Jean Michel, and Bourbon, Xavier

Abstract

Copyright of Cement & Concrete World / Cimento ve Beton Dunyasi is the property of Cimento ve Beton Dunyasi / Cement & Concrete World and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2018

Catalog

Books, media, physical & digital resources
See catalog results