Dissertations / Theses on the topic 'Mortier Porosité'
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Moustachi, Om Elkhaïat. "Influence de la microstructure des mortiers de ciment portland armes de fibres sur leur comportement mecanique en flexion." Toulouse, INSA, 1986. http://www.theses.fr/1986ISAT0002.
Full textChouicha, Kaddour. "Evolution microstructurale des micro-betons soumis a des chargements cycliques de faible frequence." Toulouse, INSA, 1986. http://www.theses.fr/1986ISAT0026.
Full textHanna, Bassam. "Contribution à l'étude de la structuration des mortiers de ciment portland contenant des particules ultra-fines." Toulouse, INSA, 1987. http://www.theses.fr/1987ISAT0004.
Full textTran, Thu Hien. "Influence des caractéristiques intrinsèques d’un mortier sur son encrassement biologique." Thesis, Saint-Etienne, EMSE, 2011. http://www.theses.fr/2011EMSE0626/document.
Full textBiofouling of wall coatings is an aesthetic and economic problem. Among microorganisms involved, the algae are the most involved. This work aimed to study experimentally the influence of intrinsic parameters (porosity, roughness and carbonation) of a cement-based mortar on its bioreceptivity and to model the development of algae.To study the algal biodegradation, an accelerated laboratory test was developed. This work was carried out with the green alga Klebsormidium flaccidum frequently identified in samples taken on colonized facades. The results show that an increase in roughness and a decrease in surface pH by carbonation of mortars promote fouling by algae.A model based on Avrami's law was used to simulate the algal colonization. Two processes involved in the mechanism of colonization: the attachment (or "germination") and the growth of algae. The kinetic parameters representing these processes have been determined and reveal the importance of the roughness and the carbonation on the constant rate of "germination".Exposure of samples in nature was also carried out. The results obtained allow recovering partially the behavior of materials in the laboratory test even if the start of colonization seems to be affected by weather conditions
JIANG, SHIPING. "Contribution a l'etude des relations entre les proprietes mecaniques et la microstructure des mortiers." Toulouse 3, 1988. http://www.theses.fr/1988TOU30175.
Full textBalayssac, Jean-Paul. "Relations entre performances mécaniques, microstructure et durabilité des bétons." Toulouse, INSA, 1992. http://www.theses.fr/1992ISAT0010.
Full textNguyen, Tien Dung. "Étude de la zone d'interphase " granulats calcaires poreux-pâte de ciment" : Influence des propriétés physico-mécaniques des granulats; Conséquence sur les propriétés mécaniques du mortier." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2013. http://tel.archives-ouvertes.fr/tel-00849595.
Full textBajja, Zineb. "Influence de la microstructure sur le transport diffusif des pâtes, mortiers et bétons à base de CEM I avec ajout de fumée de silice." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN054/document.
Full textThanks to its high mechanical strength and its potential containment capacity conferred by a compact microstructure, concrete is considered as the most suitable material to compose the engineered barrier of some radioactive waste storage structure. Knowledge of diffusion properties and microstructure of these cementitious materials is then essential to study their long-term durability. In a more specific context of low and intermediate waste management, the use of formulations containing silica fume (SF) appears of great importance. The experimental approach consists in selecting many formulations of pastes and mortars to test by the HTO through-out diffusion test. Their initial compositions (water to binder ratio, SF content, sand content and particle size) were varied in order to browse different microstructures and diffusion properties, and to see the influence of each parameter (water, SF, content and grain size of sand) on the evolution of diffusivity within these materials. The microstructure was investigated to interpret the obtained values of diffusion coefficients. Different complementary techniques have been used to characterize the porous structure (water and mercury intrusion porosimetry, nitrogen adsorption), to verify SF reactivity (TGA, SEM associated to EDS) or to determine the profile porosity at ITZ (SEM combined with image analysis).The relationship between microstructure and diffusion coefficients (DeHTO) was then discussed. The ultimate goal was to find a link between microstructure properties and transport parameters to estimate from a simple characterization, the DeHTO of concrete, difficult to get from HTO diffusion cells test. Other attempts have also been made to try to assess the concrete diffusion coefficient, such as the multi-scale modeling approach (the scale of hydrates 3D model), or the diffusion of other elements ( like oxygen or nitrogen).This study shows that silica fume agglomerates (slurry) observed in cement paste and mortar with low standardized sand content (10%), impact the filler and pozzolanic roles of the SF and therefore sustainability parameters of these materials. On the other side, the presence of high aggregates content (> 30%) during mortar’s mixing greatly improves the dispersion of SF particles and helps shearing these agglomerates by providing better homogeneity of the mixture and enhancing microstructural and diffusional properties. It was also shown that the use of the SF as a slurry form in a cementitious mixture is still significantly better than the use of the densified FS, commonly used in the literature. Relations between the DeHTO and the critical pore radius, or the DeHTO and mercury porosity have been established and helped to estimate more or less the HTO diffusion coefficients of two concretes with or without SF
Yousfi, Ismail. "Caractérisation de l’endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires." Thesis, Ecole centrale de Lille, 2015. http://www.theses.fr/2015ECLI0009/document.
Full textThe objective of this work is the characterization of heat and mechanical damage in the mortar by the nonlinear acoustic waves. The correlation between non-linear/linear acoustic parameters and damage in mortar is studied based on experiments and modelling. For the heat damage, cylindrical specimens were prepared and were characterized by studying the porosity and saturation. Indeed, the linear acoustic (UPV) and non-linear acoustic (Higher harmonic generation) were applied to characterize the damage. The linear acoustic tests have shown that velocities and modulus of Young of the mortar decreases in function of the temperature. The non-linear acoustic tests have shown that beta increases in function of the temperature.For the mechanical damage. The self-healing phenomenon was characterized by the permeability and the acoustic tests. Indeed, the permeability tests have shown that the airflow and the crack size decreases quickly in the first month then slowly for the rest of the self-healing process. On the other hand, the non-linear acoustic tests shown that the alpha and beta decreases according to the self healing process which means that the nonlinear parameters are a good indicators to characterize the self-healing. Moreover, the analysis of the experimental results indicates that the frequency resonant technique is more efficient to characterize the defects in the mortar than the higher harmonic generation. A polynomial correlations of a 2nd degree was established between the nonlinear parameters and the index damage. The findings of this work should be most appropriate as a foundation for the study of the self healing by the nonlinear acoustic waves
Yurtdas, Ismail Skoczylas Frédéric Burlion Nicolas. "Couplage comportement mécanique et dessiccation des matériaux à matrice cimentaire étude expérimentale sur mortiers /." [S.l.] : [s.n.], 2003. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2003-217-218.
Full textTran, Thu Hien. "Influence des caractéristiques intrinsèques d'un mortier sur son encrassement biologique." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00718250.
Full textBadreddine-Bessa, Anissa Gallias Jean-Louis. "Etude de la contribution des additions minérales aux propriétés physiques, mécaniques et de durabilité des mortiers." [S.l.] : [s.n.], 2008. http://biblioweb.u-cergy.fr/theses/04CERG0305.pdf.
Full textBadreddine-Bessa, Anissa. "Etude de la contribution des additions minérales aux propriétés physiques, mécaniques et de durabilité des mortiers." Cergy-Pontoise, 2004. http://biblioweb.u-cergy.fr/theses/04CERG0305.pdf.
Full textThis work proposes to quantify by a rigorous experimental methodology the effect of mineral additions on the water requirement and the superplasticizer requirement variation of mortars, their contribution to filling the porosity and to improving the mechanical strength, and their action to the transfer properties and to the chemical resistance in hard aggressive medium. The principal mixture proportion variables are the mineralogical nature, fineness and quantity of the addition, the cement type and proportioning. The obtained results show that the additions, independently of their nature and until a certain quantity, contribute to maintain the mortars transfer properties without forming a high volume of new hydrated products able to reduce open porosity. On the other hand, the additions nature and fineness are determining for their contribution to the mechanical strength development and in a lesser extent to the chemical resistance
Chemloul, Lotfi. "Détermination expérimentale des diffusivités hydriques de matériaux de construction. Etude des facteurs d'influence." Toulouse 3, 1996. http://www.theses.fr/1996TOU30298.
Full textYousfi, Ismail. "Caractérisation de l'endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires." Thèse, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/7941.
Full textRésumé : L'objectif de ce travail est la caractérisation de l’endommagement thermique et mécanique dans le mortier par les ondes acoustiques non linéaires. La corrélation entre les paramètres acoustiques linéaires et non linéaires est basée sur les essais expérimentaux et la modélisation. Des mesures expérimentales des paramètres acoustiques non linéaires en fonction de la taille de la fissure et la température ont été effectuées sur mortier. Les vitesses ont montré une diminution et les paramètres non linéaires ont montré une augmentation en augmentant le degré de fissuration. Pour l’endommagement thermique, des éprouvettes cylindriques ont été préparées et ont été caractérisées par l'étude de la porosité et de la saturation. L'acoustique linéaire (UPV) et l’acoustique non linéaire (génération d'harmoniques) ont été appliquées afin de quantifier l’endommagement. Les essais acoustiques linéaires ont montré que les vitesses transversales, longitudinales et le module d'Young du mortier diminuent en fonction de la température. Les essais acoustiques non linéaires ont montré l'augmentation du bêta est fonction de l’endommagement thermique. Pour l’endommagement mécanique et l'autocicatrisation, des anneaux de mortier ont été préparés et fissurés en contrôlant la taille de chaque fissure. Ensuite, le phénomène d'autocicatrisation est suivi par la perméabilité et des essais acoustiques. Les essais de perméabilité ont montré que le débit d'air et la taille de la fissure diminuent rapidement au cours du premier mois, puis lentement durant le reste du processus d'autocicatrisation. D'autre part, les tests acoustiques non linéaires ont montré que « alpha » et « bêta » diminuent durant le processus de l’autocicatrisation, ce qui signifie que les paramètres non linéaires sont des bons indicateurs pour caractériser ce phénomène. En outre, l'analyse des résultats expérimentaux indique que la technique de résonance de fréquence est plus efficace pour caractériser les défauts dans le mortier que la génération d'harmoniques plus élevés. À partir des essais expérimentaux et dans le but d'obtenir un résultat plus général indépendant de notre cas d’étude, les paramètres non linéaires ont été liés à un index d’endommagement. Une corrélation polynomiale de 2e degré a été établie entre les paramètres non linéaires et l’index d’endommagement. Un modèle numérique basé sur la méthode des volumes finis a été proposé afin d'établir une corrélation entre la taille de la fissure et le flux d'air. Les résultats numériques ont été comparés avec les résultats des tests de perméabilité et montré un bon accord. Les résultats de ce travail représentent un bon départ pour étudier le phénomène de l'autocicatrisation par les ondes acoustiques non linéaires.
Beck, Kévin. "Etude des propriétés hydriques et des mécanismes d'altération de pierres calcaires à forte porosité." Orléans, 2006. https://tel.archives-ouvertes.fr/tel-00125704.
Full textElaqra, Hossam Fantozzi Gilbert. "Etude de l'endommagement et du renforcement de composites à matrice cimentaire." Villeurbanne : Doc'INSA, 2006. http://docinsa.insa-lyon.fr/these/pont.php?id=elaqra.
Full textElaqra, Hossam. "Etude de l'endommagement et du renforcement de composites à matrice cimentaire." Lyon, INSA, 2004. http://theses.insa-lyon.fr/publication/2004ISAL0031/these.pdf.
Full textThis PhD work comes within the scope of the study of the elaboration and characterisation of cement-based materials. In our case, we have chosen concrete as cement-based material. Concrete is the result of mixing cement, water, aggregate, adjuvant and fibres. I have tried to understand on the one hand, the influence of the sand to cement ratio and of the water to cement ratio on the microstructure and damage mechanisms, and on the other hand, the role of the interface aggregate-cement paste in the mixture. To achieve this, we have first done tensile and compression tests, while monitoring the acoustic emission and the tomography X, in order to identify the damage and reinforcement mechanisms. We have then done microscopic observations so as to examine the microstructure changes. We have also measured the porosity and done thermogravimetric analyses. Two systems were developed for these mechanical tests. One is a direct traction system, fitted to the conditions of the study and it was designed during this work. It consists of several articulations to facilitate the alignment of the specimen during the testing. The second system allows carrying out compression tests. We have used the segment of a sphere in order to optimise the parallelism defects of two surfaces of the specimen
Benharbit, Morchadi Meriem. "Interface pierre-mortier. Mécanismes de transfert et d'altération. Procédé de passivation." Montpellier 2, 1994. http://www.theses.fr/1994MON20260.
Full textBigas, Jean-Philippe. "La diffusion des ions chlore dans les mortiers." Toulouse, INSA, 1994. http://www.theses.fr/1994ISAT0046.
Full textBur, Nicolas. "Etude des caractéristiques physico-chimiques de nouveaux bétons éco-respectueux pour leur résistance à l'environnement dans le cadre du développement durable." Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00804542.
Full textLion, Maxime Skoczylas Frédéric. "Influence de la température sur le comportement poromécanique ou hydraulique d'une roche carbonatée et d'un mortier études expérimentales /." Grenoble : Atelier national de reproduction des thèses, 2007. http://www.univ-lille1.fr/bustl-grisemine/pdf/estheses/50376-2004-61-62.
Full textLion, Maxime Skoczylas Frédéric. "Influence de la température sur le comportement poromécanique ou hydraulique d'une roche carbonatée et d'un mortier études expérimentales /." Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2005. https://iris.univ-lille1.fr/dspace/handle/1908/772.
Full textN° d'ordre (Lille 1) : 3472. Résumé en français et en anglais. Titre provenant de la page de titre du document numérisé. Bibliogr. p. 168-179.
Alshehri, Saad. "Binding of Nitrite in Concrete, Cement Mortar and Paste." Scholar Commons, 2015. http://scholarcommons.usf.edu/etd/5899.
Full textRougelot, Thomas. "Étude expérimentale multi-échelles des couplages hydriques, mécaniques et chimiques dans les matériaux cimentaires." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10115/document.
Full textTo determine the hydro-mechanical and chemical behaviour in cementitious materials is a key point to predict the durability of a structure submitted to complex stresses, such as the radioactive waste underground disposaI. This work is performed on mortars and cement pastes, with two distinct water-to-cement ratios. Coupling between hydric stresses by drying, hydro-chemical effect of calcium leaching, and the mechanical behaviour of the material, with a focus put on damage and strains evolution, are studied. Moreover, the experimental approach tries to characterize the physical phenomenons with a multi-scale view. From microscopic aspects, the characterization of the porous network is obtained by means of desorption isotherms and mercury intrusion. The influence of the W/C ratio is highlighted. Then, in a 4D approach of coupling effects between calcium leaching and cracking is conducted with X-ray microtomography (resolution: 5 µm). The restrained shrinkage due to differential strains in aggregates and cementitious matrix is shown as the cause of microcracking. ln addition, a pre-cracking increases the chemical degradation of the material. From macroscopic aspects, the shrinkage due to a smooth drying is experimentally determined, and a poromechanical model is then proposed. The diffuse microcracking effects appear to have more importance on the desorption than several localized macrocracks. Finally, the decrease in the saturation of the material modifies the splitting tensile strength. This could be due to a competitive effect between shrinkage, stresses and the influence of the aggregates in the cracking energy. Some preliminary tests are also conducted in direct tension
Chen, Xiao-Ting. "Effet du chauffage sur le comportement mécanique et poro-mécanique de matériaux cimentaires : propriétés hydrauliques et changements morphologiques." Phd thesis, Ecole Centrale de Lille, 2009. http://tel.archives-ouvertes.fr/tel-00577102.
Full textVan, Landeghem Maxime. "Local moisture distribution in a mortar paste by ex-situ and in-situ MRI : application to the understanding of the drying process." Paris 6, 2011. http://www.theses.fr/2011PA066602.
Full textBeck, Kévin. "Étude des propriétés hydriques et des mécanismesd'altération de pierres calcaires à forte porosité." Phd thesis, Université d'Orléans, 2006. http://tel.archives-ouvertes.fr/tel-00125704.
Full textpierres de monuments vis-à-vis de l'altération. A cet effet, deux pierres de construction, dont certaines
caractéristiques principales sont assez semblables (porosité totale, résistance mécanique), sont étudiées : le
tuffeau blanc, qui est largement employé dans les constructions des châteaux du Val de Loire, et la pierre de
Sébastopol, utilisée en région parisienne.
Tout d'abord, une observation des différents types de dégradations rencontrées in-situ ainsi qu'une étude de
cas sur une pierre altérée naturellement ont été réalisées afin de constater les différentes morphologies
d'altération et d'identifier l'eau comme l'agent vecteur des phénomènes d'altération.
Dans un second temps, une caractérisation multi-échelles a été effectuée afin de bien connaître les pierres
non-altérées du point de vue de leur constitution minéralogique, de la morphologie de leur milieu poreux et
surtout de leurs propriétés hydriques (capacité de rétention d'eau, propriétés de transfert de l'eau sous forme
liquide et sous forme vapeur) mais aussi de leur comportement hydro-mécanique.
La dernière partie est consacrée à la durabilité des pierres mises en oeuvre avec l'étude de la compatibilité
entre les matériaux utilisées en restauration. En effet, le comportement des pierres durant un essai de
vieillissement artificiel est comparé. La réaction différente des deux pierres face à ce même processus
d'altération est à relier directement à leurs propriétés hydriques très dissemblables. En dernier lieu, une
formulation et une caractérisation hydro-mécanique de joints de mortier est proposée afin de déterminer les
critères de compatibilité entre le mortier et les pierres en oeuvre.
Girodet, Céline Bosc Jean-Louis. "Endommagement des mortiers sous sollicitations thermo-mécaniques influence des caractéristiques des matériaux sur la résistance au gel interne des bétons /." Villeurbanne : Doc'INSA, 1999. http://docinsa.insa-lyon.fr/these/pont.php?id=girodet.
Full textKrüger, Thomas. "Propriétés mécaniques et structures internes des mortiers à ciment modifiés par l'adjonction de résines." Grenoble 1, 1990. http://www.theses.fr/1990GRE10005.
Full textYurtdas, Ismail. "Couplage comportement mécanique et dessiccation des matériaux à matrice cimentaire : étude expérimentale sur mortiers." Lille 1, 2003. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2003/50376-2003-217-218.pdf.
Full textGirodet, Céline. "Endommagement des mortiers sous sollicitations thermo-mécaniques : Influence des caractéristiques des matériaux sur la résistance au gel interne des bétons." Lyon, INSA, 1996. http://theses.insa-lyon.fr/publication/1996ISAL0122/these.pdf.
Full textThe aim of this program of research is to evaluate the relative importance of a range of components on the internal freezing resistance of mortar. For this, a new system of thermal and mechanical stressing is developed that permits the acceleration of the effect of freezing. Damage evolution is monitored continually during freezing and thawing, under mechanical stress between 20 to 60 % of rupture stress at 28 days. This evolution is then analyzed in comparison with microstructural modifications in the material. This work is highlighted the influence of pure cement (rule of Bogue's potential composition, reactivity) or pozzolanic-blended cement binders (type of pozzolane, interaction between cement and pozzolane. . . ), and aggregates characteristics (chemical nature and granulometric distribution). Analysis of the freezing resistance of all the tested materials produces a map describing the four types of damages observed in terms of microstructure of the material (porous distribution and total porosity). A study is then undertaken to examine the internal freezing behaviour of a material containing a network of air bubbles, actually reference of a durable material. This allowed the development of new formulations of concrete tailored to both function and environment
Chalencon, Florian. "Étude des interactions rhéologie, fissuration et microstructure pour le développement d'un outil de formulation : application aux mortiers poreux minces fibrés dédiés à l' ITE." Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0036/these.pdf.
Full textA thermal Insulation Composite System with rendering (ETICS) is constituted of an insulating material and a mesh reinforced rendering. More than 4 operations are compulsory to get a shotcreted ETICS. The design process, one layer/one function yielded to a low technology high product cost. A self-reinforced short fibre multi-functional rendering designed to be shotcreted could therefore enhance ETICS development. Nevertheless, physics and mechanics properties of self reinforced ETICS must be at least equivalent to regular ETICS. The objective was to build a composite design methodology to get a pseudo-strain-hardening (PSH) behaviour with a fair initial workability. Firstly, the material microstructure was analysed by coupling Dynamic Mechanical Analysis Mechanical Analysis together with Environmental Microscopy, X ray tomography, and mercury porosimetry. The rheology of the reinforced rendering in the first minutes was evaluated and systematically compared to the flow induced microstructure. Various flow regimes occurred, some hindering the shotcreting; A workability criterion was consequently defined. After maturation (21 days), R-curve analyse of the tensile mechanical behaviour, together with in situ imaging, and digital imaging correlation enlighted the bridging mechanisms involved. A PSH behaviour was clearly observed for two formulations. Finely, a virtual formulation tool is designed. Given, the fibre/matrix interfacial properties, the fiber and matrix properties, the model computed adequate formulation according to both mechanical and rheological criteria. Model designed Glass fiber ETICS, compared to experimental values did validate the design approach
Lion, Maxime. "Influence de la température sur le comportement poromécanique ou hydraulique d'une roche carbonatée et d'un mortier : études expérimentales." Lille 1, 2004. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2004/50376-2004-61-62.pdf.
Full textHe, Huan. "Analyse de l'effet d'un adjuvant biosourcé pour élaborer des matériaux cimentaires plus éco-respectueux." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD023.
Full textThis work is a part of the SEPOLBE project, which aims to develop eco‐friendly admixtures. The active principle of this admixture is made of extra‐cellular substances, secreted by microorganisms into their surroundings. It contributes to the effort in sustainable development that consists to limit the impact of buildings on environment and human health, with a guarantee of better quality concerning esthetical, durability and resistance criteria, according to the REACH regulation. The action of thisorganic product was evaluated on its setting time effects on cement as well as the mechanical behavior to the hardened state. The bioadmixture presents a significant effect on the workability of mortar (CEM I or CEM V) with a plasticizing action. Whatever the curing time, the compressive strength values of samples containing 1.5% of bioadmixture remain higher than the minimum data of standard strength according to the EN 196‐1 standard. The porosimetry by intrusion with mercury carried out with cement pastes showed the existence of a threshold (in the range 0.5‐0.75% of bioadmixture) from which the porous structure of cement pastes changes, while no modification were observed with the measurement of porosity accessible to water. For higher curing times, thesurface roughness of cement pastes, more heterogeneous, decreases with the presence of the bioadmixture. This work allowed to better control the use of a bio‐product assimilated as an admixture, as well as to contribute to the knowledge of the interactions between microorganisms and cementitious materials. An original approach, using the PCR ‐ not routinely used technique forthat purpose with cementitious materials ‐ helped to highlight that bacteria were present inside the mortar samples with a capacity to grow to higher curing time. The studied bioadmixture allows giving to the concrete the ability to resist against environmental stresses while being eco‐friendly, concerning both its chemical composition and its durability
Abidi, Sonia. "Matériaux composites à haute tenue thermique : influence de la micro-nanostructure sur les transferts moléculaires, électroniques et thermiques." Thesis, Toulon, 2014. http://www.theses.fr/2014TOUL0019/document.
Full textFire protection materials are widely used to ensure the safety of users of the infrastructure. Standards of fire protection regularly operating, the materials must be more efficient. These are generally composed of refractory mortar and insulating oxides. The objective of this work is to develop a firewall composite 4 h applied by projecting but also to determine the thermal and mechanical properties.In the first part, this study describes the various stages of the development of a fire protection material, after the presentation of the approach that has guided the development of our materials, we are interested especially in the chemical composition of the matrix and that of the cement. Their thermal and mechanical properties have been reviewed.The raw materials for the preparation of mortar were selected. The evolution respectively of thermal conductivity, diffusivity, porosity, specific heat and the mechanical properties of mortars chosen according to the nature and amount of the fillers incorporated in the matrix has been studied. A description of the various analytical and numerical models for the representation of the thermal conductivity and Young's modulus of the materials led to the development of a model able to predict the thermal and mechanical behavior of composites based on the nature and amount of charges added.In a second part, the kinetics of the hydration reaction of gypsum to control setting time and to facilitate the production of the composite in the industrial chain was studied. The influence on the kinetics of hydration, of the chemical composition of the gypsum, particle size distribution and the addition of adjuvant commonly used in the plaster industry, has also been treated.At the end of this study, two formulations of composites applied by projection were developed
Pagnussat, Daniel Tregnago. "Efeito da temperatura de queima de blocos cerâmicos sobre a resistência de aderência à tração de revestimentos de argamassa." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/79843.
Full textOver the centuries, mortar renderings have been considered a traditional building technique. However, even recent technologic improves couldn't eliminate some pathologies problems such as detachments. In Brazil, particularly, many researchers have been studying the adhesion mechanisms between mortar renderings and porous substrates in different ways. This work is part of this interest point. After the theoretical research realized, the main objective of this doctoral thesis consisted to contribute to the understanding of bond strength phenomenon, specially of some factors involved between ceramic substrates and Portland cement mortars. The proposed approach aimed to identifying the influence of ceramic substrates with different firing temperatures (and therefore with different porous surface and water absorption), and its relationship to bond strength acquired by the mortar rendering system under specific conditions. A Lime-Portland Cement mortar with specific characteristics was applied on smooth or grooved surfaces of ceramic blocks. The firing temperature of production of these ceramic blocks was 700, 800, 900 and 1000 ° C. Furthermore, the interface conditions between mortar and ceramic substrate also was varied: without any contact surface treatment, or reducing potential contact surface (and thus water/paste penetration) in the 50% area of ceramic blocks. After, had been identified the main properties of ceramic blocks that have changed or remained after the firing process, so check their influence on the results of tensile bond strenght of mortars settled on them. The results show that with changing the firing temperature of the blocks as well as the introduction of pore sealing areas to the absorption of water and / or binder in blocks surfaces, the tensile bond strength of mortar renderings also varied considerably. There is a significant relationship between pore structure of the ceramic substrate, depending on the firing temperature, and the bond strength of the mortar rendering system.
Kunc, Michal. "Latexem modifikované cementové kompozity." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-233376.
Full textPei, Yan. "Effets du chauffage sur les matériaux cimentaires - impact du « self-healing » sur les propriétés de transfert." Thesis, Ecole centrale de Lille, 2016. http://www.theses.fr/2016ECLI0016/document.
Full textThis experimental work focused on the degradation of two cementitious materials, mortar (for most tests) and a concrete following an intense heating to 600 ° C and 700 ° C sometimes. The idea that underpinned the study was to "measure" this degradation via the transport properties : gas permeability and porosity to gas under confining stress and some poro-mechanical properties. To carry out this work, several experimental techniques have been developed or improved. This is particularly the porosity measurement gas under a confining stress. The use of a neutral gas is used to fill the voids in the material and connected to calculate its porosity. Rehydration with demineralized water has a considerable effect on the highly heated material because it restores much of the porosity which regains its initial level or sometimes a value less than one. Logically the "self-healing" also restores much of the permeability which does not recover its original level
Žižlavský, Tomáš. "Vliv použitého kameniva na vlastnosti vápenných malt." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-265681.
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