Letteratura scientifica selezionata sul tema "Granulats de béton recyclés"
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Articoli di riviste sul tema "Granulats de béton recyclés":
El Maghri, Sanaa, Samia Yousfi, Hicham Essallaki e Mouna Latifa Bouamrani. "Étude de l’effet de l’ajout des déchets de marbre sur les propriétés du béton à base de granulats de briques recyclés (GBR)". Matériaux & Techniques 110, n. 5 (2022): 502. http://dx.doi.org/10.1051/mattech/2022032.
Kenai, S., e F. Debieb. "Caractérisation de la durabilité des bétons recyclés à base de gros et fins granulats de briques et de béton concassés". Materials and Structures 44, n. 4 (1 novembre 2010): 815–24. http://dx.doi.org/10.1617/s11527-010-9668-7.
BOUSSETTA, Ines, Saloua EL EUCH KHAY, André LECOMTE e Jamel NEJI. "Caractérisation des performances des bétons compactés aux rouleaux à base de granulats recyclés". Revue des composites et des matériaux avancés 27, n. 1-2 (30 giugno 2017): 151–64. http://dx.doi.org/10.3166/rcma.27.151-164.
Wirquin, E., R. Hadjieva-Zaharieva e F. Buyle-Bodin. "Utilisation de l'absorption d'eau des bétons comme critères de leur durabilité—Application aux bétons de granulats recyclés". Materials and Structures 33, n. 6 (luglio 2000): 403–8. http://dx.doi.org/10.1007/bf02479650.
Medevielle, Marion, Marielle Gueguen-Minerbe e Thierry Sedran. "Utilisation d’une souche bactérienne alcalino-résistante productrice de CaCO3pour l’amélioration de la qualité des granulats de béton recyclé". Matériaux & Techniques 104, n. 5 (2016): 506. http://dx.doi.org/10.1051/mattech/2017020.
Québaud, Mirian, Roumiana Zaharieva e François Buyle-Bodin. "Le comportement des bétons incluant des granulats recycleés". Revue Française de Génie Civil 2, n. 8 (gennaio 1998): 969–84. http://dx.doi.org/10.1080/12795119.1998.9692222.
Barrioulet, M., e C. Legrand. "L'effet de masse des granulats dans l'écoulement du béton frais vibré". Materials and Structures 20, n. 3 (maggio 1987): 196–201. http://dx.doi.org/10.1007/bf02472736.
Baraka, Abdelhak, Mohammed Matallah, Mustapha Djafour e Mokhtar Bouazza. "Caractérisation des effets régissant le comportement dynamique du béton". Matériaux & Techniques 106, n. 5 (2018): 502. http://dx.doi.org/10.1051/mattech/2018043.
Barrioulet, M., e C. Legrand. "Influence des caractéristiques des granulats sur les actions intergranulaires dans l'écoulement du béton frais". Materials and Structures 22, n. 5 (settembre 1989): 339–43. http://dx.doi.org/10.1007/bf02472503.
El abidine Rahmouni, Zine, Nadia Tebbal e Hassan Haroun abdellah. "Influence de la nature des granulats sur le comportement rhéologique du béton à hautes temperatures". MATEC Web of Conferences 11 (2014): 01010. http://dx.doi.org/10.1051/matecconf/20141101010.
Tesi sul tema "Granulats de béton recyclés":
Hadjieva-Zaharieva, Roumiana. "Durabilité des bétons à base de granulats recyclés". Artois, 1998. http://www.theses.fr/1998ARTO0205.
Abriak, Yassine. "Valorisation des sédiments de dragage et des granulats de béton recyclés". Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2023. http://www.theses.fr/2023MTLD0004.
In the last years, the extraction of raw materials has been considerable. This is due to the increase in the world's need for raw materials, resulting in a drastic reduction in these non-renewable resources. At the same time, according to ADEME (Agence Nationale de la Transition Ecologique), 342 Mt of waste are produced every year, including 240 Mt from the construction industry. On the other hand, in order to maintain port, maritime and river activities, 50 Mm3 of sediment is dredged every year. Management of sediments on land is becoming more and more complicated due to the saturation of storage areas and the presence of contaminants. We need to implement a national strategy to preserve raw quarry materials and supply our territory as effectively as possible. The use of recycled aggregates and sediments is becoming an imperative and can provide a mineral resource that can help limit the use of natural resources. The main objective of this thesis work is the valorization of recycled sediments and concrete aggregates in various civil engineering applications. The first application is the covalorization of recycled sediments and aggregates in subgrades. The second is the valorization of recycled concrete fines as a mineral additive in cement. Finally, the covalorization of sediments and recycled concrete sand in mortar as a sand substitute
Bentegri, Imane. "l'Effet des fibres organiques sur un béton fluide à base des granulats recyclés". Thesis, CY Cergy Paris Université, 2021. http://www.theses.fr/2021CYUN1016.
This work concerns the influence of organic fibers on concrete based on natural and recycled aggregates. The first part of this study focuses on the effect of fibers on concrete behavior in the fresh and hardened state. To achieve this objective, four concrete formulations (without fiber, without superplasticizer and based on natural aggregates), as well as 9 fiber-reinforced concretes without and with superplasticizer have been developed. The concrete formulations were characterized in the fresh state (workability, rheology and tribology) and the hardened state in terms of compressive strength, modulus of elasticity, porosity and permeability. The results showed that the introduction of organic fibers of 19mm at a dosage of 0.24% in combination with the admixture improves the mechanical strength of concrete and maintains a good workability.The second part of this work deals with the study of fiber-reinforced concrete made with recycled aggregates. In addition, the effect of the recycled aggregate preparation method on the behavior of fresh and hardened concrete has been evaluated. In fact, two methods of preparing recycled aggregates were chosen, the saturation and the pre-humidification method. For recycled aggregates valorization, three volumetric substitution ratios were selected : 30, 50 and 70%. For all materials, the properties in the fresh state, the physical and mechanical properties in the hardened state were studied.The obtained results in this part show that the preparing method of the recycled aggregates influences significantly the properties of the concrete, hence the saturated aggregates do not show any effect on the workability, the rheology and the tribology of the concrete but reduces its mechanical resistance. Unlike pre-saturated aggregates, which maintained a good mechanical strength but reduce workability and have a negative influence on the rheological and tribological behavior of concrete. In regards of the recycled aggregates influence, it has been shown that their introduction induces a reduction in mechanical resistance in the short term. Moreover, in the long term, the latter is influenced by the method of preparation of the aggregates
Quebaud, Mirian. "Caractérisation des granulats recyclés, étude de la composition et du comportement de bétons incluant ces granulats". Artois, 1996. http://www.theses.fr/1996ARTO0003.
Nguyen, Vu Nam. "Valorisation de fines et granulats issus de bétons recyclés comme matériaux cimentaires : Enhancement of fine and aggregate issued from recycled concrete as cementitious materials". Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30058/document.
The concrete consumption has been becoming more and more important due to the increase of urbanization requiring the rehabilitation and the construction of buildings and infrastructure. Nevertheless, the concrete production that accompanies the urban development leads to many environmental problems related to the preservation of natural resources which are not inexhaustible. Despite of recycling efforts, most of recycled materials are typically used for road works or embankment. By participating in the French National Project Recybéton, this thesis aims to assess the enhancement of recycling materials issued from deconstructed concretes by incorporating them in new concrete design. Two types of recycled materials will be studied, the powder produced in large quantities during the crushing phase of demolished concrete, and the aggregates (sand and gravel) whose the most part issued from the initial natural aggregates. Therefore, research study aims to quantify the properties of cementitious materials in various states by the use of: • recycled aggregates in the granular skeleton, grinded recycled concrete sand and powder of dust removal as supplementary cementing materials. The first part is dedicated to the study of the influence of moisture states of recycled aggregates (sand and gravel) on the concrete's rheology evolution in time and the study of their impact on 28 days compressive strength. The results obtained within the limit of experimental context will allow suggesting recommendations on the initial moisture state of recycled aggregates and their incorporation's rate in the concrete mix. The second part presents the evaluation of the feasibility of using grinded recycled concrete sand and crushed concrete powder (industrially recovered) as supplementary cementing materials. From the results, it will be possible to assess the extent that these fines are compatible with cement matrix in the fresh state, hardening state and hardened state. The third part proposes a way to limit the problem of Alkali-Aggregate Reaction (AAR) in recycled concrete. The strategy is based on two methods. The first insists to verify the applicability of the FD P18-464 documentation when using recycled aggregates. The second examines the interest in the use of mineral additives to limit or even prevent the AAR
Khoury, Eliane. "Maîtrise de l’eau efficace dans les bétons de granulats recyclés". Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2018. http://www.theses.fr/2018MTLD0011/document.
Composed of several components (natural aggregates and adherent cement paste), RCA are not widely recommended in new concrete formulations. Their poor properties considerably complicate the determination of the effective water in fresh concrete. In a first part, a bibliographic study will highlight the wide dispersion of the results of characterization tests of RCA and the properties of fresh and hardened recycled concrete. In a second part, the heterogeneity of RCA and crushed concrete aggregates (CCA) is studied according to different parameters: granular impurities, density, cement paste content, mixing of parent concrete, and water absorption capacity according to their pre-humidification. The third part consists of three experimental studies that intend to improve effective water control in the manufacture of recycled concrete. The absorption kinetics of CCA in a cement paste is first studied. Then, the evolution of effective water in fresh concrete during mixing is studied using an original method based on the power evolution of the mixer. Finally, the effect of vacuum mixing on the properties of ordinary and recycled concretes is investigated
Laneyrie, Cléo. "Valorisation des déchets de chantiers du BTP : comportement à haute température des béton des granulats recyclés". Thesis, Cergy-Pontoise, 2014. http://www.theses.fr/2014CERG0707/document.
In the past decade, constructions sites have been growing more than ever, and the aggregate production and importation are not sufficient any more to cover the needs in construction materials. The goal set in France is to re-use 20 more Mt each year of waste as recycled material for building sites before 2020.The objective of this experimental study is to assess the high temperature behavior of ordinary and high performance concrete made with recycled coarse aggregates (RCA). Concrete behavior at high temperature -expansion of aggregates, withdrawal of cement paste, increase of vapor pressure, chemical transformations...- can lead to several phenomena such as spalling, and a dramatic loss of mechanical properties. As aggregates occupy a large volume of concrete, around 60-80%, they play a major role in the heat and mass transfer into concrete during fire. Recycled coarse aggregates (RCA) being different from natural coarse aggregates (NCA) in many ways – higher porosity, double interfacial transition zone – it is essential to study recycled aggregate concrete behavior when submitted to high temperature.Two types of recycled coarse aggregates are used. An industrial one, obtained from a building demolition site and a laboratory one was obtained from a parent concrete (PC) mixed, cast and crushed in the laboratory. From both recycled aggregates, normal concrete (w/c = 0.6) and high performance concrete (w/c = 0.3) are cast. The four recycled concretes are compared to reference concretes, with the same formulation, made with silico-calcereous coarse natural aggregates. Concretes cylinders are subjected to heating/cooling cycles, up to 150, 300, 450 or 750°C. The heating rate is 0.5°C/min, and is followed by a 2 hours stage once the target temperature is reached, to insure an homogeneous temperature inside the cylinder. Cracks of concrete specimen are observed by optical microscopy, then their residual mechanical performances are measured (compressive strength, splitting tensile strength and dynamic young modulus). Their thermal behavior (conductivity, diffusivity, specific heat, thermal gradient during heating), and the evolution of their microstructure (loss of weight, porosity) are also studied.The study is completed with a Life Cycle Analysis were the life cycle of 1m3 of concrete is studied according three options. A scenario without recycling, a scenario were demolition waste are recycled into aggregates in-situ, a scenario were demolition waste are recycled into aggregates and transported to another construction site
Peña, Torres Pablo. "Modélisation du comportement à long terme des bétons de granulats recyclés". Thesis, CY Cergy Paris Université, 2020. http://www.theses.fr/2020CYUN1072.
The construction sector in France generated 246 million tonnes of waste. Almost all of this waste is inert waste that does not pose a danger to human health and the environment. The recovery of this waste makes it possible to limit the extraction of virgin resources and, consequently, to reduce the emission of greenhouse gases. The use of recycled aggregates allows the preservation of natural resources, the reduction of transport costs and therefore the reduction of energy consumption and greenhouse gas emissions, rapid implementation, and finally reduction quantities of materials landfilled.As part of the ANR ECOREB, and more particularly at the level of Minh-Duc Nguyen's thesis, tools for knowledge and simulation of the behavior of recycled concrete have been developed. The validity of the analytical relationships developed to predict the mechanical properties of natural aggregate concrete for use in recycled aggregate concrete has been revised and appropriate modifications have been proposed to take into account the presence of recycled aggregates. However, the behavior of creep in compression under several loading levels and at different ages has not been studied at the same level as the mechanical behavior in compression, tension, and failure. In addition, the applicability of the analytical models proposed in the design standards has not been verified.The objective of this research work is to study the effect of recycled aggregates on the long-term behavior of concrete and to enrich the predictive models proposed by the standards by introducing relevant parameters that take into account the effect of the incorporation of recycled aggregates on delayed behavior.This study presents an analysis of the data available in the literature on the ability of design standards to predict the creep behavior of concrete from natural and recycled aggregates. The comparison between the experimental and predicted values shows a significant dispersion in terms of creep coefficient. Nevertheless, EC2 remains the most appropriate standard for estimating creep for both natural and recycled concrete compared to ACI and MC2010 fib. For this reason, the EC2 was chosen as the reference model to propose the appropriate modifications.Based on the general expression which gives the creep coefficient, the creep coefficient conventional and the power of the aging function, as well as the coefficient according to the relative humidity have been identified for the concrete of natural aggregates first by an optimization approach. Analysis of the results showed different values compared to the values of the existing standards. Furthermore, a new expression for the creep coefficient has been proposed by the EC2 model as well as by the ACI, which has been called modified models. With all these modifications, the correlation between the experimental and predicted values is improved for both models EC2 and ACI.In order to consider the presence of recycled aggregates in the concrete, the equivalent replacement rate was introduced in the modified expressions, which represents the mass of the recycled aggregates compared to the mass of the granular skeleton. A rheological model based on the Kevin-Voigt model was also developed as part of this work.For the modeling of the creep deformation of concrete with recycled aggregates, software ABAQUS and ANSYS was used which uses Prony coefficients to define the viscoelastic behavior of the material
Nguyen, Minh Duc. "Performances mécaniques des bétons incorporant des granulats recyclés et applicabilité des normes de dimensionnement". Thesis, Cergy-Pontoise, 2017. http://www.theses.fr/2017CERG0912.
This work is part of the ANR VBD ECOREB which aims with the project PN RECYBETON to remove the technological locks for the use of recycled aggregates for the formulation of structural concretes.For this study, six concretes of recycled aggregates corresponding to two classes of compressive strength C25 / 30 and C35 / 40 and S4 class of workability are developed. These mixtures, defined in the framework of the PN RECYBETON, are derived from two reference formulations by substituting partially or completely the natural aggregates with materials resulting from the recycling of concretes. An experimental program was carried out to determine the properties of concrete in fresh state and hardened state. The results of mechanical tests show that for the same class of compressive strength, the incorporation of recycled aggregates into the concrete induces a decrease in the tensile strength and the elastic modulus as well as an increase in the peak and ultimate strains. Under loading-unloading compression, the damage at the peak stress increases when the substitution rate is high while the damage rate becomes lower The creep tests carried out on beams loaded under three-point bending indicate that creep kinetics are influenced by the presence of recycled aggregates and is accelerated as the replacement rate is important.The experimental results of the present study together with an extensive number of results reported in the literature have allowed evaluating the current relationships used for predicting mechanical properties of recycled concrete aggregates (RAC). The validity of many analytical expressions of the stress-strain relationship has been also studied and the effect of replacement ratio was taken into account. It was pointed out that design codes relationships dedicated to assess the mechanical properties and the stress-strain compressive curve of natural aggregates concretes (NAC) are not adequate to predict the behavior of recycled aggregates concrete (RAC). It is established that these properties are related to fcm and to a parameter, which takes into account the effect of the recycled aggregates. The comparison between the stress-strain curves obtained in this thesis and some models shows that, with the proposed modifications, these models satisfactorily describe the behavior up to failure
Martinez, Hernandez Heriberto. "Amélioration de granulats de béton recyclé par bioprécipitation". Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0009.
Recycled concrete aggregates (RCA) contain, due to their origin, residual cement paste which gives them high porosity and moderate performance. The porosity leads to a strong water absorption. This is a major difficulty on the industrial level because it complicates the adjustment of water in concrete batches, which allows to control their workability in production. The RCA manufacturing process results in having more paste in the finer particles and therefore more absorption. As a result, while the industry today recycles coarse RCA into concrete relatively well, it uses small amounts of RCA sand because of their greater porosity. Yet, during the manufacture of RCA, about 50% sand and 50% coarse aggregates are obtained. Consequently, the porosity of RCA sand hinders the circular economy of concrete. A number of techniques have been proposed for removing or improving the residual cement paste, but they are expensive. The natural carbonation of RCA by atmospheric CO2 helps with decreasing their water absorption by obstructing their porosity, but this is a several month reaction. Research is ongoing to make accelerated carbonation (by concentrating CO2, for example) on an industrial scale. The present work explores an alternative idea, which consists in forming in a few days, using biocalcifying bacteria, a matrix of CaCO3 around the RCA and especially the sand part, in order to limit the access of water to their porosity. First, candidate non-pathogenic bacteria were identified, selected, adapted to the alkaline medium of RCA, then we checked their ability to produce CaCO3. In a second step, we detemined the conditions, which favor uniform bacterial colonization and production of CaCO3 on the surface of model agar media. Homogeneity is indeed mandatory to obtain good water tightness. We thus confirmed the value of selecting bacteria capable of producing biofilm. Finally, the methods developed were applied to model mortar disks facilitating visual observations. Preliminary results confirm that it is possible to significantly lower the absorption of these mortars within one month. Further work is needed to confirm these encouraging results on sand part of RCA
Libri sul tema "Granulats de béton recyclés":
Alexander, Mark G. Aggregates in concrete. London: Taylor & Francis, 2005.
Swamy, R. N. The Alkali-Silica Reaction in Concrete. London: Taylor & Francis Group Plc, 2003.
Blight, G. E. Alkali-aggregate reaction and structural damage to concrete: Engineering assessment, repair, and management. Leiden, The Netherlands: CRC Press/Balkema, 2011.
Alexander, Mark G. Aggregates in concrete. London: Taylor & Francis, 2008.
Chandra, S. Lightweight aggregate concrete: Science, technology, and applications. Norwich, N.Y: Noyes Publications/William Andrew Pub., 2003.
Clarke, John L. Structural Lightweight Aggregate Concrete. Taylor & Francis Group, 1993.
Sims, Ian, e Alan B. Poole. Alkali-Aggregate Reaction in Concrete: A World Review. Taylor & Francis Group, 2017.
Sims, Ian, e Alan B. Poole. Alkali-Aggregate Reaction in Concrete: A World Review. Taylor & Francis Group, 2017.
Shi, Caijun, Della Roy e Pavel Krivenko. Alkali-Activated Cements and Concretes. Taylor & Francis Group, 2005.
Sims, Ian, e Alan B. Poole. Alkali-Aggregate Reaction in Concrete: A World Review. Taylor & Francis Group, 2017.
Atti di convegni sul tema "Granulats de béton recyclés":
HICHOUR, Sana, Rachid ESSAMOUD e Lhoucine EJJAOUANI. "Caractérisation de sables fins marins de la région de Casablanca (Maroc) en tant que granulats pour béton". In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2012. http://dx.doi.org/10.5150/jngcgc.2012.111-h.