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Artykuły w czasopismach na temat "Coffrage (construction en béton) – Environnement"
Boutemy, Camille, Arthur Lebée, Mélina Skouras, Marc Mimram i Olivier Baverel. "Modélisation et conception d’un coffrage réutilisable pour la fabrication de coques minces en béton de formes complexes". SHS Web of Conferences 147 (2022): 09003. http://dx.doi.org/10.1051/shsconf/202214709003.
Pełny tekst źródłaAugereau, Claire. "De l’opportunité du balcon dans Siloé (1941) de Paul Gadenne et Un Balcon en forêt (1958) de Julien Gracq". RELIEF - Revue électronique de littérature française 16, nr 1 (8.07.2022): 87–102. http://dx.doi.org/10.51777/relief12345.
Pełny tekst źródłaRozprawy doktorskie na temat "Coffrage (construction en béton) – Environnement"
Bouharoun, Samir. "Comportement tribologique des huiles de décoffrage à l'interface béton/coffrage : influence de la formulation du béton". Electronic Thesis or Diss., Artois, 2011. http://www.theses.fr/2011ARTO0209.
Pełny tekst źródłaIn a context where sustainable development has become a major priority, the companies in the building field must face to new requirements in terms of respect of the environment. In particular, during the concrete pouring, a mineral release agent, poorly biodegradable is currently used as separating layer non-stick. The nature of this oil creates significant risks of environmental pollution. New formulations of release agent of vegetable origin were developed.The appearance of this new product range requires a sufficient knowledge of their behavior at the interface concrete/release agent/formwork. This report contributes to the study the effect of the concrete composition on the tribological behavior at the interface concrete/formwork with two release agents of different nature (vegetable release agent and mineral release agent). The zone of concrete near the formwork was studied without release agents. First, the evolution of the density of the concrete at the approach of a wall was evaluated as a function of the contact pressure and the past volume. Then, a comprehensive analysis of this fresh layer was carried out to estimate the W/B ratio and the amount of paste mobilized close to the formwork. A physicochemical study was performed by reconstituting the interstitial medium of the interface concrete/release agent/formwork containing a different dosage of oil and superplasticizer. Several adapted techniques to these complex medium were used to evaluate the formation of soaps and to determine the stability of the obtained emulsions. This thesis ends with a study of the friction of fresh concrete against the formwork with and without release agent using a plan/plan tribometer. Many formulations of concrete are studied. The results were allowed to understand the mechanism of action of the fines element and the dosage of superplasticizer at the interfaces concrete/formwork and concrete/release agent/formwork. In the case of vegetable release agent, the soap formed from the esters and fatty acids contributes to reduce the friction by stabilizing the emulsion and organizing the interface. However, the presence of the superplasticizer is necessary to obtain a high performance for the mineral release agent
Bouharoun, Samir. "Comportement tribologique des huiles de décoffrage à l'interface béton/coffrage : influence de la formulation du béton". Thesis, Artois, 2011. http://www.theses.fr/2011ARTO0209/document.
Pełny tekst źródłaIn a context where sustainable development has become a major priority, the companies in the building field must face to new requirements in terms of respect of the environment. In particular, during the concrete pouring, a mineral release agent, poorly biodegradable is currently used as separating layer non-stick. The nature of this oil creates significant risks of environmental pollution. New formulations of release agent of vegetable origin were developed.The appearance of this new product range requires a sufficient knowledge of their behavior at the interface concrete/release agent/formwork. This report contributes to the study the effect of the concrete composition on the tribological behavior at the interface concrete/formwork with two release agents of different nature (vegetable release agent and mineral release agent). The zone of concrete near the formwork was studied without release agents. First, the evolution of the density of the concrete at the approach of a wall was evaluated as a function of the contact pressure and the past volume. Then, a comprehensive analysis of this fresh layer was carried out to estimate the W/B ratio and the amount of paste mobilized close to the formwork. A physicochemical study was performed by reconstituting the interstitial medium of the interface concrete/release agent/formwork containing a different dosage of oil and superplasticizer. Several adapted techniques to these complex medium were used to evaluate the formation of soaps and to determine the stability of the obtained emulsions. This thesis ends with a study of the friction of fresh concrete against the formwork with and without release agent using a plan/plan tribometer. Many formulations of concrete are studied. The results were allowed to understand the mechanism of action of the fines element and the dosage of superplasticizer at the interfaces concrete/formwork and concrete/release agent/formwork. In the case of vegetable release agent, the soap formed from the esters and fatty acids contributes to reduce the friction by stabilizing the emulsion and organizing the interface. However, the presence of the superplasticizer is necessary to obtain a high performance for the mineral release agent
Vanhove, Yannick. "Contribution à l'étude du frottement d'un béton autoplaçant contre une surface métallique : application aux poussées contre les coffrages". Artois, 2001. http://www.theses.fr/2001ARTO0203.
Pełny tekst źródłaThe main objective of this thesis is to investigate the friction of fresh concrete with metallic formwork. A specially designed tribometer was developed to investigate such friction and was adapted for various types of concrete mixtures. The originality of this work lies mainly in the fact that it concerns a commonly used material for wich the friction against the forming surface has not been sufficiently investigated. A new approach is used in this study to predict the lateral pressure induced by the fresh concrete pressure. A particular interest is the formwork pressure exerted by highly flowable concrete, or self-compacting concrete. When the concrete is cast into place, a limit interface layer reduces the frictional stresses with the formwork material. When the pressure applied on the concrete is greater than a certain critical pressure, some of the cement particles and fines come into direct contact with the formwork material, and the concrete begins to follow a granular comportment. This leads to greater increase in friction stress which varies with the flow velocity between the rising fresh concrete and formwork material. When a demoulding agent is applied at the interface, the friction stress depends mainly on the physico-chimical characteristics of the resulting film of paste at the interface. In certain cases, these agents can maintain the integrity of the limit layer near the wall surface. This allows, during the flow of the plastic concrete, to reduce the friction at the wall compared to similar situation where a demoulding agent is not used. Well established models used for silos were used to predict the formwork pressure exerted by fresh concrete. Similary between the evolution of concrete pressure and ensiled granular mediums one was observed on site, though the strains are different. From these observations, several models derived from Janssen's model, have been proposed. The model adapted in the case of fresh concrete allows the prediction with satisfaction formwork pressure. This study can therefore enable the used of the designed tribometer to test a variety of material and placement parameters to predict formwork pressure instead of large-scale and often expensive field tests
Spitz, Nicolas. "Développement d'un procédé frugal de démoulage in situ des parois de coffrage – Etude des signatures fonctionnelles des parois de coffrage". Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0001.
Pełny tekst źródłaIn the civil engineering industry, the formwork oil spraying has become essential to avoid the concrete friction and adhesion on the formwork skins. Their usage on site is limited because their application is time consuming and polluting. Nowadays, the challenges lie in the development of new alternatives to oils based on surface signatures of formwork skins. Even though a large amount of work investigates novel formulations for ecological oils, few studies investigate the effect of these signatures on interfacial phenomena acting between concrete and formwork. Thus, in the present thesis work, the concrete friction on formwork skins has been studied first using a plan/plan tribometer simulating the condition of concrete forming. After developing a small laboratory-scale instrumented test to reproduce the formwork removal process on site, concrete adhesion was secondly quantified. The analysis of experimental data and the multi-physics characterization of formwork surfaces make it possible to establish the functionality of the signatures of skins on the friction and the adhesion of concrete, respectively. These correlations are used to propose an ideal solution of formwork limiting these phenomena to the interface concrete-formwork
Andriamanantsilavo, Ny Riana. "Comportement des matériaux cimentaires dans un coffrage : expérimentation, modélisation et simulation de la poussée et du processus de maturation". Lorient, 2003. http://www.theses.fr/2003LORIS029.
Pełny tekst źródłaYoussef, Alice. "Prise en compte des apports mécaniques du béton de chanvre pour le calcul de structure bois/béton de chanvre et métal/béton de chanvre". Electronic Thesis or Diss., Lorient, 2017. http://www.theses.fr/2017LORIS431.
Pełny tekst źródłaLime and hemp concrete (LHC) is nowadays the most developed bio-based aggregate building material in Europe. It consists of hemp shiv and mineral binder mixing with water. Generally, bio-based materials like LHC are used for their thermal insulation properties in building. Most blocks of Lime Hemp Concrete which have been studied, show a brittle behavior and a very low mechanical strength. The formulations are generally rich in binder and slightly compacted. Up to now, this material is then not considered as a load bearing material and is mainly used as filler insulation, combined with structure components made of wood, concrete or masonry. A study has tested other formulations, with higher contents of aggregates thanks to a compaction process, in order to improve both the rigidity and the strength of the hardened mixtures. In these formulations, shiv which has higher amount is definitely lighter and more porous than lime, which prevents a significant increase in thermal conductivity. The present work of my PhD is an experimental study of the compressive and shearing behavior of hemp concrete, in order to study the load-bearing capacity and bracing of this bio based material, while maintaining good qualities of thermal insulation in building. Two compacted formulations were tested M1 & M4, as well as samples obtained from trade-blocks Chanvribloc®. Two series of tests were performed. The first one is a uniaxial compression test in each direction for characterizing the mechanical anisotropy of the material. This anisotropy is induced by the compacting process. The second one permits to characterize the shearing behavior of the different mix-designs. In this study, an original shear device was developed, specifically designed for this kind of material, which allows shearing under controlled normal stress. An image processing performed was carried out, using a camera and ARAMIS image processing software during shear tests, to evaluate the fields of deformations and to study the behavior of the specimen during the shear test. The compressive experiments results have shown that this material is anisotropic, even when it is industrially molded by vibrations. The material has a transverse isotropic behavior. The behavior in the longitudinal direction is characterized by very high ductility, while the transverse behavior is very brittle, with a highly variable and unsteady behavior. The experimental results in shear show a high ductility of this material. These results are very promising, an interesting behavior of LHC walls in term of potential bracing. Numerical modeling and applications have been carried out to illustrate the use of hemp concrete blocks for bracing buildings. The formulation M4 exhibits a better behavior under moderate and average seismic actions, compared to the formulation M1, while the Chanvribloc walls in the present state do not allowthe buildings to be braced in moderate or medium seismic zones
Deby, Fabrice. "Approche probabiliste de la durée des bétons en environnement marin". Toulouse 3, 2008. http://thesesups.ups-tlse.fr/370/.
Pełny tekst źródłaA probabilistic approach to prediction of concrete's durability in marine environment is proposed in this thesis. The aim of this work is to develop a methodology linked with the performance-based approaches using the concept of durability indicators. The probabilistic FORM algorithm and the coupled deterministic model are developed to estimate the reliability index of the material. The probability distributions of the random variables are built. A multiplicative error is introduced in order to integrate information from different concretes into a single database and a Bayesian network is presented to update these results by further experiments. A practical example is proposed for a reinforced concrete immersed in sea water. A semi-probabilistic design for engineering based on characteristic values and partial safety factors is developed to achieve the same reliability
Héroux, Sandrine. "Coffrer. Recycler. Réutiliser. Coffrages complexes en cire réutilisable informés par simulations acoustiques et algorithmes génétiques". Master's thesis, Université Laval, 2020. http://hdl.handle.net/20.500.11794/40166.
Pełny tekst źródłaThis research adresses the themes of digital fabrication, complex formwork and architectural acoustics, which it interrelates through a research by design approach. Its main objective is to develop a design process based on an acoustic performance parameter and a fabrication technique for concrete that will be suitable to generate future projects. The first chapter identifies the main digital manufacturing technologies for the production of non-standard concrete formwork. A method to be explored is then selected: wax formwork milled by a three-axis machine, a reusable material that therefore does not produce waste. The second chapter focuses on the generation of these complex forms by exploring the potential of architectural acoustics coupled with genetic algorithms to inform them. The following sections aim to develop a methodology for the creation of wax formwork, while defining the limits and validating the advantages of this production method. The objective is to subsequently transpose these features into the creation of a genetic algorithm that automates the iterative process of simulation, analysis and creation of an optimal non-standard acoustic geometry. To achieve this, the moulding of various concrete prototypes is performed, according to which a specific wax manufacturing method is developed. A series of specific recommendations for the modelling of these formworks results from these physical tests. Pursuant to the previous findings, genetic algorithms coupled with a simulation by ray tracing are defined. They generate a curved acoustic concrete reflector that distributes sound uniformly to a specific area, an element that exploits the low absorption coefficient of this material. This work is subsequently applied and informed by the execution of a concrete concert hall project that is the result of this feedback between theory, practice and design.
Schiopu, Nicoleta. "Caractérisation des émissions dans l'eau des produits de construction pendant leur vie en oeuvre". Lyon, INSA, 2007. http://theses.insa-lyon.fr/publication/2007ISAL0076/these.pdf.
Pełny tekst źródłaThe various French and European regulatory or voluntary actions push more and more the construction products manufacturers to an environmental assessment policy. A « horizontal » approach (i. E. , applicable to one or several families of products used in a certain scenario) is considered the best route for the assessment. Moreover, it is required by the Mandate M/366 addressed to CEN. The aim of this research is to contribute to the development of this kind of approach, in order to assess the substances emission from construction products into water, during their service life. Three products were tested: concrete slabs, wood duckboards and zinc gutters. The experiments were carried out at two scales: laboratory scale (controlled conditions) and pilot scale (outdoor / not-controlled conditions, with meteorological monitoring). At pilot scale the products were exposed to meteoric water, during one year. A release model (chemical and transport modelling) was developed for the case of the concrete slabs. PHREEQC software was adapted and used. The main results show that in order to assess the substances emission from construction products into water, in a « horizontal » approach framework, the following steps are required and must take into account the product and the exposure conditions specificities: - physicochemical characterisation of the product, which could be more or less complex, depending on the product and on the knowledge already available ; - characterisation of leaching behaviour, under static (equilibrium) and dynamic conditions, which must take into account especially the use and the evolution of the product during its service life. The Continuous Monolithic Leaching Test (CMLT) seems more suitable for release dynamic assessment ; - modelling of the products behaviour in a specific exposure scenario. The laboratory data cannot be directly transferred to service conditions but they are essential for the modelling of environmental behaviour
Bouchenafa, Othmane. "Mécanosynthèse et matériaux de construction : optimisation et application pour la clinkérisation et la géopolymérisation". Electronic Thesis or Diss., Paris Est, 2019. http://www.theses.fr/2019PESC1003.
Pełny tekst źródłaConstruction materials are an essential need for humans. After Water, concrete is the most widely used material in the world and cement production is constantly increasing due to the increase in the world population. In 2010, the annual cement production reached 3.3 billion tonnes. An increase of +6.9% was recorded in 2015 for a production that reached 4.6 billion tonnesStudies conducted on the environmental impact of the clinker manufacturing process have revealed that for a production of one tonne of clinker, a quantity of 0.7 to 0.8 tonnes of CO2 is released into the atmosphere or an annual emission of 2.8 billion tonnes of CO2. These greenhouse gas emissions are responsible for 5% of global emissions. In order to reduce this impact, solutions already proposed such as the use of alternative fuels for clinker manufacture, the partial substitution of cement by industrial co-products or carbon capture and storage.This thesis is part of a desire to reduce the carbon impact in the manufacture of construction materials by introducing the mechanosynthesis process into the production process of clinker and cement as well as geopolymers.The thesis work has been divided into 3 main parts:The first part concerns the mechanosynthesis process optimization by adding process control agents (PCAs). The use of these agents for the grinding of fly ash and blast furnace slag has reduced the milling time to 15 minutes, whereas without PCA, 1 hour milling time is required, or even 3 hours for optimal milling. Cement pastes which we have substituted up to 50% clinker with industrial co-products activated by mechanosynthesis with PCAs (we have used alcohol and water) have shown higher mechanical performance than those prepared with 100% Portland cement.Cement pastes prepared with a substitution of 50% milled slag 15 min + 4% alcohol has shown an improvement in mechanical performance (compression) of + 10%, + 15% and + 40% compared to a reference cement paste for 7, 28 and 90 days respectively.The second part aims to propose a clinkerization process by indirect mechanosynthesis. We have used limestone and clay (traditional products for clinker manufacturing) to produce an equivalent clinker. To achieve our objective, we have used indirect mechanosynthesis, which consists of coupling a mechanical activation with short milling time and a heat treatment not exceeding 900°C. This technique has allowed us to produce the essential compounds of clinker, C3S alite (Ca3SiO5), β-C2S belite (Ca2SiO4) and C3A aluminates.The last part is focused on the direct mechanosynthesis process used for the production of a ready-to-use geopolymer powder only by adding water. This process consists of mixing aluminosilicates such as slag, fly ash or metakaolin with chemical activators by grinding to obtain a final geopolymer product.Geopolymer paste formulations have been made and encouraging results in terms of compressive strength have been obtained
Książki na temat "Coffrage (construction en béton) – Environnement"
Geoffrey, Lee, red. Formwork: A practical approach. London: E & FN Spon, 1997.
Znajdź pełny tekst źródłaHanna, Awad S. Concrete Formwork Systems. New York: Marcel Dekker, Inc., 2003.
Znajdź pełny tekst źródłaConcrete formwork systems. New York: Marcel Dekker, 1998.
Znajdź pełny tekst źródłaLee, Geoffrey. Formwork: A Practical Guide. Taylor & Francis Group, 2014.
Znajdź pełny tekst źródłaLee, Geoffrey. Formwork: A Practical Guide. Taylor & Francis Group, 2014.
Znajdź pełny tekst źródłaLee, Geoffrey. Formwork: A practical guide. Taylor & Francis, 1997.
Znajdź pełny tekst źródłaLee, Geoffrey. Formwork: A Practical Guide. Taylor & Francis Group, 2014.
Znajdź pełny tekst źródłaWest, Mark. Fabric Formwork Book: Methods for Building New Architectural and Structural Forms in Concrete. Taylor & Francis Group, 2016.
Znajdź pełny tekst źródłaWest, Mark. Fabric Formwork Book: Methods for Building New Architectural and Structural Forms in Concrete. Taylor & Francis Group, 2016.
Znajdź pełny tekst źródłaFabric Formwork Book: Methods for Building New Architectural and Structural Forms in Concrete. Taylor & Francis Group, 2016.
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