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Academic literature on the topic 'Matériau activé par alcalin'
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Journal articles on the topic "Matériau activé par alcalin"
Oualit, Mehena, Amar Irekti, and Arezki Sarri. "Influence des conditions de durcissement et le taux d’alcalins sur les performances mécaniques des matériaux alcali-activés à base du laitier de haut fourneau." Matériaux & Techniques 110, no. 2 (2022): 202. http://dx.doi.org/10.1051/mattech/2022017.
Full textOualit, Mehena, Amar Irekti, and Arezki Sarri. "Influence des conditions de durcissement et le taux d’alcalins sur les performances mécaniques des matériaux alcali-activés à base du laitier de haut fourneau." Matériaux & Techniques 110, no. 2 (2022): 202. http://dx.doi.org/10.1051/mattech/2022017.
Full textGÉRARD, Jean, Marie-France THÉVENON, Emmanuel GROUTEL, and Kévin CANDELIER. "Les bois tropicaux dans les ouvrages hydrauliques et les constructions marines." BOIS & FORETS DES TROPIQUES 360 (June 1, 2024): 3–5. http://dx.doi.org/10.19182/bft2024.360.a37570.
Full textGuiza, Sami, and Mohamed Bagane. "Étude cinétique de l’adsorption du rouge de Congo sur une bentonite." Revue des sciences de l’eau 26, no. 1 (March 18, 2013): 39–50. http://dx.doi.org/10.7202/1014918ar.
Full textJuarez, Cesar, Gerardo Fajardo, and Pedro Valdez. "Caractérisation microstructurale des fibres naturelles pour des matériaux composites à base de ciment." Canadian Journal of Civil Engineering 36, no. 3 (March 2009): 449–62. http://dx.doi.org/10.1139/l09-009.
Full textDissertations / Theses on the topic "Matériau activé par alcalin"
Yang, Qi. "Résistance au feu de géopolymère alcalin et de de géopolymère acide." Electronic Thesis or Diss., Centrale Lille Institut, 2024. http://www.theses.fr/2024CLIL0014.
Full textThis work deals with the fire resistance properties of geopolymers alkali- or acid-activated.The first part deals with the state of the art of the development of geopolymer materials,including their synthesis process, activation methods, application scenarios, and the influenceof their components on properties. A particular focus is on their potential benefit as fire-resistant materials. The thesis reveals the superior fire resistance of alkaline geopolymers andinvestigate the factors affecting the fire resistance, including the Al/Si ratio, and type ofcations. The results evidence that the lower the Al/Si ratio, the more the geopolymer softensat high temperatures (≥ 100°C) and expands due to the driving force of water vaporization.Compared to sodium-based geopolymers, potassium-based geopolymers have a lower levelof polymerization for the same curing time. Even with a high Al/Si ratio, low-polymerizationsilicates can form and cause the geopolymer to expand at high temperatures. In contrast,sodium-based geopolymers undergo higher complete polymerization reactions but lose theirsoftening ability at high temperatures (≥ 100°C) and are prone to cracking.Similar to alkali-activated geopolymers, acid-activated geopolymers exhibit good fireresistance thanks to their intumescence characteristics upon heating. The main factorinfluencing such property is the P/Al ratio. When the P/Al ratio is high (≥ 0.74), a largeamount of slightly condensed phosphorus is generated, which dehydrates and condensesupon heating, causing the material to soften and expand. Due to this intumescencecharacteristic, geopolymers with low Al/Si (alkaline geopolymer) or high P/Al (acidicgeopolymer) are promising fire-resistant material
Rifai, Farah. "Immobilisation de déchets magnésiens dans un matériau alcali-activé : étude expérimentale et numérique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN043/document.
Full textThe operation phase of the first generation of nuclear reactors in France has generated magnesium and graphite long lived low-level wastes (LLW-LL). Their conditioning in a hydraulic binder matrix is being addressed. In order to study the behavior of these packages, several coupled mechanisms have to be considered: the magnesium alloy can corrode within the encapsulating matrix, especially when galvanic coupling with the graphite occurs. The corrosion of the metal results in the development of corrosion products. The growth of corrosion products around the metal and the restriction of the hydraulic binder’s delayed strains may lead to the generation of internal stresses. The verification of certain safety requirements (dimensional stability of the package and low hydrogen production) is therefore essential. It requires the development of a numerical model able to predict the behavior of these packages.In particular, a sodium hydroxide activated blast furnace slag mortar is being addressed. It belongs to the family of alkali-activated materials for which the modelling of ageing behavior is rarely approached. Hence, the construction of the numerical model involves a large experimental campaign covering the thermo-chemo-mechanical behavior of the alkali-activated mortar and the corrosion of magnesium in hydraulic binders. Meso-scale homogenization calculations are undertaken in order to determine upscaled properties of the mix (matrix + wastes) and carry out simulations on the scale of the packages.Regarding the first experimental study axis, a relatively low hydration heat is measured. This is beneficial with respect to the internal stress generated from the self-restriction of the thermal strains within massive structures.Nevertheless, the materials undergoes a particular autogenous shrinkage strains showing an increase even at long term. However, its basic creep strains are shown to be important which could result in stress relaxation and avoids damage related to shrinkage restriction.Regarding the metal’s corrosion behavior in the alkali-activated mortar, it is compared to the one in two different ordinary Portland cement (OPC) based mortars. Microscopic observations are conducted on samples especially designed to monitor the galvanic corrosion of the alloy. They show the aggressiveness in OPC mortars (localized corrosion manifested by holes and layered microstructure) against limited homogeneous corrosion in alkali-activated mortar. Additionnaly, corrosion kinetics are determined using different experimental methods: mass loss and electrochemical measurements. The complementary results of these two types of measurements also show a low corrosion in the alkali-activated slag mortar with a passive state of the metal achived at 6 months of embedment. This advantage of slag mortar is explained by a high electrical resistivity with respect to OPC mortars, determined by electrochemical impedance spectroscopy.Finite element simulations are performed using Cast3m software on meso-scale in order to evaluate the mechanical effect of the corrosion layer development on the surrounding matrix. The corrosion kinetics of the alloy, the nature of corrosion products and their mechanical properties identified using SEM/EDS and nano-indentation techniques are implemented. The calculations indicate low stress generation in the alkali-activated mortar
Mallmann, Aimery de. "Modifications du benzène par adsorption sur des faujasites échangées par des ions alcalins." Paris 6, 1986. http://www.theses.fr/1986PA066347.
Full textVidil, Thomas. "Contrôle du procédé d'élaboration et des propriétés d'un matériau époxy via la chimie supramoléculaire." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066142.
Full textControlling the pot life and the gelation of epoxy resins is a crucial issue in thermosets processing. In this study, we report about the control of the gel time (tgel) and the gel conversion (xgel) for the cationic polymerization of commercial epoxy resins. To this end, hydroxyl additives are used as chain transfer agent to control xgel. Concurrently, oligo(ethylene oxide) additives are used to vary tgel as a result of the supramolecular complexation of the anilinium cations responsible for the polymerization’s initiation. We show that the combination of these two control levers enables the exploration of a wide range of tgel and xgel values. When a cyclic oligo(ethylene oxide) (18-crown-6) is used, anilinium cations are stabilized on very long period as a result of strong host-guest interactions. In absence of transfer agent, a slight increase of temperature is enough to observe the dissociation of the anilinium•18-crown-6 complex and the fast initiation of polymerization. The anilinium•18-crown-6 complex can be isolated and used as a thermoresponsive initiator presenting a high apparent activation energy. When used in combination with hydroxyl additives, a temperature increase results in a long delay of polymerization followed by the rapid completion of the material’s reticulation. By varying the composition of the initial mixture it is possible to tailor the duration of the polymerization’s delay. Thus, the resulting system is programmable and exhibits a clock like behavior. This chemistry is then extended to the copolymerization of diepoxy and monoepoxy resins to control the crosslink’s density of the material and thus, the properties of the final networks
Vidil, Thomas. "Contrôle du procédé d'élaboration et des propriétés d'un matériau époxy via la chimie supramoléculaire." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066142.
Full textControlling the pot life and the gelation of epoxy resins is a crucial issue in thermosets processing. In this study, we report about the control of the gel time (tgel) and the gel conversion (xgel) for the cationic polymerization of commercial epoxy resins. To this end, hydroxyl additives are used as chain transfer agent to control xgel. Concurrently, oligo(ethylene oxide) additives are used to vary tgel as a result of the supramolecular complexation of the anilinium cations responsible for the polymerization’s initiation. We show that the combination of these two control levers enables the exploration of a wide range of tgel and xgel values. When a cyclic oligo(ethylene oxide) (18-crown-6) is used, anilinium cations are stabilized on very long period as a result of strong host-guest interactions. In absence of transfer agent, a slight increase of temperature is enough to observe the dissociation of the anilinium•18-crown-6 complex and the fast initiation of polymerization. The anilinium•18-crown-6 complex can be isolated and used as a thermoresponsive initiator presenting a high apparent activation energy. When used in combination with hydroxyl additives, a temperature increase results in a long delay of polymerization followed by the rapid completion of the material’s reticulation. By varying the composition of the initial mixture it is possible to tailor the duration of the polymerization’s delay. Thus, the resulting system is programmable and exhibits a clock like behavior. This chemistry is then extended to the copolymerization of diepoxy and monoepoxy resins to control the crosslink’s density of the material and thus, the properties of the final networks
Aoukar, Manuela. "Dépôt de matériaux à changement de phase par PE-MOCVD à injection liquide pulsée pour des applications mémoires PCRAM." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT075/document.
Full textPhase change random access memories PCRAM are based on the fast and reversible switch between the high resistive amorphous state and the low resistive crystalline state of a phase change material (PCM). These memories are considered to be one of the most promising candidates for the next generation of non volatile memories thanks to their unique set of features such as fast programming speed, multi-level storage capability, good endurance and high scalability. However, high power consumption during the RESET operation (IRESET) is the main challenge that PCRAM has to face in order to explode the non volatile memory market. In this context, it has been demonstrated that by integrating the phase change material (PCM) in high aspect ratio lithographic structures, the heating efficiency is improved leading to a reduced reset current. In order to fill such confined structures with the phase change material, a highly conformal deposition process is required. Therefore, a pulsed liquid injection Plasma Enhanced-Metal Organic Chemical Vapor Deposition process (PE-MOCVD) was developed in this work. First, amorphous and homogeneous GeTe films were deposited using the organometallic precursors TDMAGe and DIPTe as Ge and Te precursors. XPS measurements revealed a stoichiometric composition of GeTe but with high carbon contamination. Thus, one of the objectives of this work was to reduce the carbon contamination and to optimize the phase change properties of the deposited PCMs. The effect of deposition parameters such as plasma power, pressure and gas rate on the carbon contamination is then presented. By tuning and optimizing deposition parameters, GeTe films with carbon level as low at 2 at. % were obtained. Thereafter, homogeneous films of GeSbTe were deposited by injecting simultaneously the organometallic precursors TDMAGe, TDMASb and DiPTe in the plasma. A wide range of compositions was obtained by varying the injection and deposition operating parameters. Indeed, one of the main advantages of this process is the ability of varying films composition, which results in varying phase change characteristics of the deposited PCM. The impact of plasma parameters on the conformity of the process was also studied. It was shown that by adding a low frequency power component to the radio frequency power of the plasma, structures with high aspect ratio were successfully filled with the phase change material. Finally, electrical characterization of PCRAM test devices integrating phase change materials deposited by PE-MOCVD as active material have presented electrical properties similar to the ones obtained for materials deposited by conventional physical vapor deposition (PVD) process