Academic literature on the topic 'Pâte de ciment hydratées'
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Journal articles on the topic "Pâte de ciment hydratées":
Chadfeau, Calypso, Sayed Hashim Mohseni, Safiullah Omary, Vincent Steiner, Essia Belhaj, Christophe Fond, and Françoise Feugeas. "Influence d’un bioadjuvant sur l’adhésion du ciment sur parois coffrantes et évaluation de l’effet de la rugosité des parois coffrantes." Matériaux & Techniques 108, no. 3 (2020): 301. http://dx.doi.org/10.1051/mattech/2020031.
Sanahuja, Julien, Luc Dormieux, and Gilles Chanvillard. "Modélisation de l'élasticité d'une pâte de ciment au jeune âge." Revue Européenne de Génie Civil 11, no. 9-10 (December 2007): 1241–68. http://dx.doi.org/10.1080/17747120.2007.9692986.
Sanahuja, Julien, Luc Dormieux, and Gilles Chanvillard. "Modélisation de l'élasticité d'une pâte de ciment au jeune âge." Revue européenne de génie civil 11, no. 9-10 (December 31, 2007): 1241–68. http://dx.doi.org/10.3166/regc.11.1241-1268.
Yurtdas, Ismail, Shouyi Xie, Jean Secq, Nicolas Burlion, Jian-Fu Shao, Malek Sibai, Pierre Brossolet, and Bernard Fraboulet. "Couplage comportement mécanique et perméabilité. Cas d'une pâte de ciment pétrolier dégradée chimiquement à 90 °C." Revue européenne de génie civil 11, no. 6 (August 30, 2007): 827–37. http://dx.doi.org/10.3166/regc.11.827-837.
Dequiedt, A. S., E. Vigneron, L. Chermant, and M. Coster. "Etude de l’hydratation d’une pâte de ciment par analyse automatique d’images en microscopie électronique à balayage." Revue de Métallurgie 97, no. 2 (February 2000): 179–86. http://dx.doi.org/10.1051/metal/200097020179.
Faure, Paméla, and Sabine Caré. "Suivi par IRM et par T1 de l'effet du couplage hydratation–séchage sur la microstructure de pâte de ciment." Comptes Rendus Chimie 9, no. 3-4 (March 2006): 548–55. http://dx.doi.org/10.1016/j.crci.2005.06.041.
Bessenouci, Mohammed Zakaria, Nacereddine Bibi Triki, Smaine Khelladi, and Abderrahmane Abene. "Approches théoriques de la conductivité thermique apparente du béton de pouzzolane à l’aide d’une modélisation des matériaux poreux." Journal of Renewable Energies 14, no. 3 (October 24, 2023). http://dx.doi.org/10.54966/jreen.v14i3.270.
Dissertations / Theses on the topic "Pâte de ciment hydratées":
Hoeun, Sela. "Influence de l'adhésion entre les principales phases cimentaires sur le comportement mécanique de la pâte de ciment hydratée." Electronic Thesis or Diss., Ecole centrale de Nantes, 2023. http://www.theses.fr/2023ECDN0049.
This PhD thesis focuses on the multi-scale modelling of mechanical properties of cementitious materials. The aim of this PhD thesis is to obtain the mechanical properties of hydrated cement paste phases at nano-scale using Molecular Dynamics (MD) simulations. Mechanical properties of hardened cement paste at micro-scale were then calculated with homogenization scheme and Discrete Element Method (DEM). Indeed, properties obtained at the lower scale are considered as the input data at the upper scale. At nano-scale, tensile test and shear test were performed with main hydrated cement paste phases (i.e., calcium-silicate-hydrates, portlandite and ettringite) via MD simulations. As a result, mechanical properties at nano-scale were obtained. Another approach to obtain Young’s modulus and Poisson ratio was done via Voigt-Reuss-Hill approximation. With homogenization scheme (i.e., Mori-Tanaka scheme), Young’s modulus and Poisson’s ratio of a simplified hardened cement paste were calculated. Finally, DEM simulation was done with tensile test of a simplified hardened cement paste by taking into account the mechanical properties at the nano-scale. This PhD thesis contributes to create the bridge of achieving the transition from the molecular scale to the continuous microscopic scale
Zhu, Xiaodong. "Étude à l'échelle nanométrique du nano-revêtement organique efficace sur la surface de la pâte de ciment dans un environnement agressif pour des matériaux de construction durables." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDENGSYS/2023/2023ULILN035.pdf.
Improving the life-time of cement paste is a significant challenge in construction sector. Surface treatment approaches, such as surface coating, surface pore sealing, and surface impregnation, have been playing a significant role to improve the durability of cement-based structures especially in preventing surface deterioration and damage. Experimental investigations indicate that surface coating, acting as a physical barrier, is an effective way for enhancing the durability of materials by avoiding the penetration either of water or hazards substances. Due to the experimental observation limitations, there is an urgency need to deeper delve the atomic level to understand the mechanism behind the success hydrophobic behavior of cement surface modified with a nano-coating treatment.Therefore, this dissertation adopts a nano-scale level study to understand and control the nano-coating process to engineer an impermeable hydrophobic Calcium-Silicate-Hydrate (CSH) surface through nano-coating of epoxy and rubber films under aggressive environment. To this end, Molecular Dynamics (MD) simulations based on a combination potential of a general force field (CLAYFF) and the consistent-valence force field (CVFF) have been employed to represent the interatomic interactions between CSH and epoxy or rubber films. A developed realistic model has been used to represent the CSH nanostructure.The thesis is dedicated, first, to study deeply the hydrated surface properties of CSH paste in order to thoroughly understand the hydrophilic nature of the (001) CSH surface. Then, a fully investigation has been performed on the interfacial interaction and adhesion properties between epoxy resins nano-coating and CSH surface. For that, we use diglycidyl ether of bisphenol A (DGEBA) as epoxy monomer and m-phenylenediamine (MPD) as hardener. Thereafter, an in-depth analysis of a hydrophobic rubber nano-coating process onto CSH surface is explored. Four types of rubber are employed, as TPI (1,4-trans-Polyisoprene), CPI (1,4-cis-Polyisoprene), TPB (1,4-trans-Polybutadiene), and CPB (1,4-cis-Polybutadiene). Finally, the present work is devoted to analyze the interfacial deterioration process between epoxy/rubber nano-coating of CSH surfaces under aggressive environment, like a salty water (4 wt.% of NaCl).Results obtained indicate that epoxy and rubber coated CSH surface energy are drastically dropped to the range of 33.7 mJ/m2- 48.4 mJ/m2, which extremely reduces the hydrophilicity of the CSH surface. The averaged contact angle between water-nanodroplet and rubber coated CSH surface is found in range of 92.85° and 98.11°. The calculated interfacial adhesion between organic-coatings (epoxy and rubber) and CSH is in range of 49.42 mJ/m2 to 102.81 mJ/m2. Additionally, m-phenylenediamine (MPD) would highly improve the epoxy nano-coating efficiency. Regarding rubber nano-coating, it is found that coating process with TPI (1,4-trans-Polyisoprene) and CPB (1,4-cis-Polybutadiene) than CPI (1,4-cis-Polyisoprene) and TPB (1,4-trans-Polybutadiene) will enhance efficiently the impermeability of CSH paste. Under aggressive conditions, non-fully epoxy nano-coating is detached more distorted in 4 wt.% of NaCl solution due to the chlorine ions, which are responsible to attack the CSH surface. A continuous well-distributed rubber nano-coating is capable to make CSH impermeable under harsh environment leading to a promising future for sustainable cementitious materials.The doctoral thesis concludes the feasibility and reliability of nano-coating by rubber film to prevent the interfacial deterioration of CSH surfaces in aggressive environment and to improve the impermeability of nano-coated CSH surfaces for more durable cementitious materials
Zajac, Maciej. "Etude des relations entre vitesse d'hydratation, texturation des hydrates et résistance mécanique finale des pâtes et micro-mortiers de ciment Portland." Dijon, 2007. http://www.theses.fr/2007DIJOS006.
This work is dedicated to the study of the influence of curing temperature on hydration of Portland cement in the range 5–45°C. The effects of the temperature on the evolution of compressive strength have been correlated separately with the evolution of the hydration degree and the microstructure of the hydrates. We show that the origin of the temperature effects is related to the hydration of tricalcium silicate of cement (C3S). The initial hydration of C3S is more rapid as the temperature is high but it is more decelerated as soon as the hydration is limited by the diffusion of water and the ions through the layer of hydrates (C-S-H) formed around the grains during the early period. Under these conditions, the barrier is denser, consequently, the evolution of the long-term hydration is slower. The temperature alters the density and repartition of C-S-H as well, giving a more porous material. These phenomena are responsible for the lower final resistance at higher temperature
Feneuil, Blandine. "Stabilité des mousses de ciment : lien avec les propriétés rhéologiques de la pâte de ciment." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1045/document.
Cement foams advantages compared to normal concrete is their low density, low material need and thermal insulation properties. To better understand how the morphology of the cement foam affects its properties, we create solid cement foam with well controlled structure. This involves two steps: the creation of the fresh cement foam with chosen structure, and the stability of this structure up to cement hardening. Our cement foam fabrication protocol allows us to obtain fresh cement foams samples with very well controlled parameters. For each sample, all the bubbles have the same size, and we can select the content of air, water, cement and surfactant. This technique consists in mixing a well-controlled precursor aqueous foam stabilized by surfactant, with a cement paste prepared separately. First, we study the interaction of surfactants and cement paste. Some surfactants cannot stabilize foam in cement paste highly alkaline solution. Some others, mainly anionic surfactants, adsorb on cement grains surface, which modifies interactions between cement grains and consequently the yield stress of the cement paste. At low surfactant concentration, cement grain surface becomes hydrophobic and yield stress increases due to hydrophobic attraction between cement grains. At high surfactant concentration, adsorbed micelles create a steric repulsion between cement grains and make yield stress of cement paste drop. In a second chapter, we study the effect of bubbles on the yield stress of aerated cement paste. To compare the results with the literature, the measured yield stress is normalized by the yield stress of the suspending cement paste, i.e. taking into account the effect of surfactant. For a surfactant with low affinity to cement grains surface, results are consistent with literature, whereas reduced yield stress is much higher than expected when surfactant strongly adsorb on cement grain surface. This effect is attributed to the change of the bubble surface properties due to the adsorption of hydrophobic cement grains at the air-liquid interface. Then, we focus on cement foam stability, at air content 83%. We first study three series of experiments at given water-to-cement ratio and bubble size. For each series, the yield stress of the cement paste is changed by addition of superplasticizer or high amount of anionic surfactant. Unexpectedly, the best foam stability is obtained for relatively low yield stress. Rheological measurements on the fresh cement foams allowed us to understand this improved stability as a consequence of the reorganization of cement grains into denser packing. In a second part on stability, we study the influence of bubble size, water-to-cement ratio and surfactant content. A stability criterion is defined from the bubble size and the interstitial cement paste yield stress. Eventually, we observe that cement foam structure affects water imbibition velocity and mechanical resistance to compression of hardened cement foams
Soltani, Fethi. "Caractérisation de la pâte de ciment par des méthodes ultrasonores." Phd thesis, Ecole Centrale de Lille, 2010. http://tel.archives-ouvertes.fr/tel-00685879.
Brisard, Sébastien. "Analyse morphologique et homogénéisation numérique : application à la pâte de ciment." Phd thesis, Université Paris-Est, 2011. http://tel.archives-ouvertes.fr/tel-00617356.
Regnaud, Laure. "Evolution temporelle au jeune âge de la fluidité de la pâte de ciment adjuvantée de superplastifiants type polycarboxylate." Dijon, 2006. http://www.theses.fr/2006DIJOS039.
Bessaies-Bey, Hela. "Polymères et propriétés rhéologiques d'une pâte de ciment : une approche physique générique." Thesis, Paris Est, 2015. http://www.theses.fr/2015PEST1042/document.
To fulfil the rheological requirements of cementitious materials, mix designer engineers use various polymers. Theses admixtures either stay in the suspending fluid modifying its viscosity or adsorb at the surface of cement particles modifying their surface properties and their interactions. In this work, we propose a general physical frame allowing for the description of the consequences of the addition of one or various polymers on the rheology of cement paste. We identify two main parameters affecting the rheology of cement paste, which can be modified by chemical admixtures. These parameters are the inter-particle distance and the viscosity of the suspending fluid. Our solution viscosity and hydrodynamic radii measurements in synthetic cement pore solution suggest that the volume fraction of polymers is the main parameter enhancing the viscosity of the suspending fluid. By means of rheological and adsorption measurements, we study the effects of polymers on the inter-particle distance and the rheological behavior of the suspension. Finally, we study the competitive adsorption between polymers at the surface of cement particles. We propose a technique based on dynamic light scattering measurements allowing for the measurement of the respective adsorption of two polymers at the surface of cement particles. We then study the competitive adsorption between a super-plasticizer and sulfate ions, retarder or viscosity enhancing admixtures
Hermida, German. "Influence du volume de pâte et de la concentration en ciment sur la performance du béton : vers le développement d'un béton à contenu minimal en pâte." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2008. http://tel.archives-ouvertes.fr/tel-00572748.
Hermida, Germán. "Influence du volume de pâte et de la concentration en ciment sur la performance du béton : vers le développement d'un béton à contenu minimal en pâte." Cachan, Ecole normale supérieure, 2008. http://tel.archives-ouvertes.fr/tel-00572748/fr/.
The paste volume or the cement content is a parameter still not well studied regarding the performance of concrete. Actually the majority of the investigations were focused on the quality of the paste and not its quantity. However there is a permanently growing interest to reduce the paste volume in concrete, for environmental and economical reasons. Nowadays some standards define a minimum paste or cement content for certain W/C ratios, but improvements in admixtures and better grading models allow reducing of the cement content/paste volume below these limits. The collection and processing of the bibliography data allowed identifying the effects of the paste volume on some of the principal concrete properties. This research proofed through experiments some of the identified tendencies in the data analysis and it helped to comprehend other still unclear tendencies. When the paste volume is reduced, while maintaining its quality, compressive strength, abrasion, and elastic module grow and workability, bleeding, shrinkage, porosity, capillary absorption and penetration of the chloride ion are reduced. In the evaluated ranges, the reduction of the paste volume did not show effects on the concrete setting times, flexural strength and the progression of carbonation. The use of admixtures of the last generation (polycarboxilate) and an optimal granulate progression using the MEC model, allowed to produce concretes with paste volumes and cement contents below the limits defined by the codes. They have a better workability, mechanic behavior and durability than the conventional concretes
Book chapters on the topic "Pâte de ciment hydratées":
"Diffushité des ions chlore dans la zone de transition entre pâte ciment et roche granitique." In Interfaces in Cementitious Composites, 285–94. CRC Press, 1992. http://dx.doi.org/10.1201/9781482271256-39.