Literatura científica selecionada sobre o tema "Fines de béton recyclé"
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Artigos de revistas sobre o assunto "Fines de béton recyclé"
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.º 5 (2016): 506. http://dx.doi.org/10.1051/mattech/2017020.
Texto completo da fonteBouhamou, N., N. Belas, H. Mesbah, R. Jauberthie, A. Ouali e A. Mebrouki. "Influence des rapports eau/ciment et fines/ciment sur le comportement à l’état durci du béton autoplaçant à base de matériaux locaux algériens". Canadian Journal of Civil Engineering 36, n.º 7 (julho de 2009): 1195–206. http://dx.doi.org/10.1139/l09-071.
Texto completo da fonteHussain, Hallshow, e Daniel Levacher. "Etude de l’affaissement et des performances d’un béton recyclé". Déchets, sciences et techniques, n.º 30 (2003). http://dx.doi.org/10.4267/dechets-sciences-techniques.2462.
Texto completo da fonteDeclercq, Zoé. "partition des Rythmes sur tabla". Les Pages du laa 15, n.º 37 (8 de outubro de 2024). http://dx.doi.org/10.14428/lpl.v15i37.85453.
Texto completo da fonteTeses / dissertações sobre o assunto "Fines de béton recyclé"
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.
Texto completo da fonteThe 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
Bouarroudj, Mohamed ElKarim. "Utilisation de matériaux naturels modèles pour la formulation de mortier contenant des sables et des fines de granulats recyclés". Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0016.
Texto completo da fonteRecycled concrete aggregates (RCA) are not enough used in the construction sector, mainly because of their high water absorption capacity. These fine particles are composed of crushed natural aggregate and adherent hardened cement paste. The first part of this work consists in valuing particles smaller than 4 mm of an RCA in a mortar composition. Thus, the fresh and hardened behavior of mortar performed with recycled fine aggregate and model natural aggregate have been compared. The natural model fine aggregate has been performed to have an equivalent physical characteristics with the recycled one. This approach helped to understand the hardened behavior of the mortar made with recycled fine aggregate. The second part of this work consists in finding a recovery track for particles smaller than 125 μm of RCA, the goal is to use them as mineral addition. A characterization work show that the recycled powder is porous, thus a theoretical model and an experimental methodology allowing to estimate this porosity are developed. Finally, a comparison between mortar made with a limestone powder, and a recycled powder are compared. The results show that the recycled powder can be used as mineral additive in mortar composition
Abidar, Abdellatif. "Etude des mécanismes de régénération de l'hydraulicité de bétons recyclés dans le cadre d'une approche économie circulaire". Electronic Thesis or Diss., Université Gustave Eiffel, 2024. http://www.theses.fr/2024UEFL2039.
Texto completo da fonteConcrete, widely used in construction, is essential to modern society. However, as buildings reach the end of their life cycle, demolition becomes inevitable, contributing to the annual accumulation of concrete debris. This situation presents a major challenge in construction waste management. Faced with this reality, concrete recycling emerges as a necessity. This approach not only reduces the amount of waste sent to landfills but also preserves natural resources, promoting sustainable construction.This thesis is part of a research project focused on concrete recycling from a circular economy perspective. It offers an in-depth study of the regeneration of hydraulic properties of cementitious materials, aiming to understand the underlying mechanisms of this regeneration. This analysis is performed in three distinct stages. Initially, we examined a pure phase of C3S, followed by an intermediate phase using Portland cement, concluding with a study on recycled concretes from returns and demolitions.We propose a process based on the thermal treatment of powders derived from crushing cementitious materials, conducted at low temperatures ranging from 400°C to 800°C. To understand the mechanisms of hydraulicity regeneration, characterization techniques such as TGA, FTIR, 29Si-NMR, and XRD with the Rietveld method (TOPAS V6) were employed.Thermal treatments applied to various phases from 600°C revealed the formation of belite. Specifically, the β-C2S polymorph formed in the case of the pure phase, while the α'-C2S and β-C2S polymorphs formed in the case of Portland cement paste. Thermal treatments applied to returns and demolition concretes revealed similar mechanisms, with belite formation observed from 700°C onwards. These findings were confirmed by X-ray diffraction (XRD) and 29Si-NMR spectroscopy, the latter also showing complete decomposition of C-S-H at 600°C, leading to belite formation. The regenerated phases exhibit high reactivity, likely due to the strong reactivity of lime produced during thermal treatments. Consequently, almost all formed belite was consumed after 28 days of hydration. Binders obtained at temperatures between 600 and 800°C led to the reformation of hydrates such as C-S-H, Portlandite, and Ettringite.Mortars made with 100% binders from thermal treatments applied to cement pastes exceeded 16 MPa in compression after 90 days and could reach over 30 MPa when replaced by 40% CEM I, despite their high water demand. Conversely, mortars composed of 100% binders from concrete do not exceed 4 MPa in compression after 90 days but can reach over 20 MPa in compression and 5 MPa in flexion when replaced by 40% CEM I
Faubert, Jean-Philippe. "Valorisation de particules fines dans les bétons compactés au rouleau et les bétons moulés à sec". Mémoire, Université de Sherbrooke, 2013. http://hdl.handle.net/11143/10147.
Texto completo da fonteMartinez, Hernandez Heriberto. "Amélioration de granulats de béton recyclé par bioprécipitation". Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0009.
Texto completo da fonteRecycled 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
S, Bastien Mari-Jo. "Valorisation des granulats de béton recyclé et des granulats de verre recyclé dans les pavages industriels en béton compacté au rouleau". Mémoire, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8799.
Texto completo da fonteDeodonne, Kunwufine. "Etudes des caractéristiques physico-chimiques de bétons de granulats recyclés et de leur impact environnemental". Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD013/document.
Texto completo da fontePromoting the use of demolition waste as recycled aggregates presents a double objective: first to preserve natural resources and secondly to relieve storage site. In regards to natural aggregates, recycled aggregates contain mortar that influences theirs properties and those of concrete in which they are used. The objective of this thesis is to develop the use of 100 % recycled aggregates in concrete. This study was realised in patnership with the company CHYRSO. Properties of recycled concrete aggregates collected from several sources were studied to identify and analyse their specificities ; results were compared to natural ones. Normalised methods were modified in order to be applied on recycled aggregates and new methods were also proposed. Recycled aggregates present higher water absorption, lower mechanical strength, spreader granular distribution and a less circular shape compared to natural aggregates. The granulometry of recycled sand, fines content and the water absorption are properties that depend on the sampling and the robustness of protocols used. A reactivity of fines obtained from materials made at the laboratory have been established, meanwhile their influence on concrete properties is considered as minor. Finally, the absorption and morphology of recycled aggregate depend on the granular fraction. Correlation between morphological and mechanical properties with water absorption have been demonstrated. After analysing these properties, correction were proposed on mechanical performance forecasting models. It was also shown that the use of fines in recycled aggregate concretes provides better mechanical properties. For such materials, keeping aggregates less than 63μm is advisable because it provides correct granular skeletton. In order to balance the loss of workability and mechanical strength observed with the use of recycled aggregates, studies were carried with several superplasticisers. Polycarboxylates were identified as appropriate superplasticisers. Interpretations facilitate understanding of concrete formulation and concrete equivalent mortar formulation made with recycled aggregates. Thus, the complexity of absorption and desorption kinectics lead to a discusion around effective water definition. The difference between the morphology of recycled aggregates and natural ones involved a correction of the granular skeletton; finally, their weakness during mechanical test modifies the granular skeletton and need to be taken into consideration.Finally, studies on environmental impacts of recycled aggregates concrete were done and compared with those of natural aggregates concrete. This study starts interesting perspectives
Zhao, Zengfeng. "Valorisation des sables de béton recyclé pour la fabrication de mortiers". Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10004/document.
Texto completo da fonteVery large quantities of construction and demolition wastes and especially concrete wastes are produced yearly. At the same time, high amounts of natural aggregates are needed for construction industry. Up to now, only a small fraction of these concrete wastes is re-used as recycled concrete aggregates (RCA) for the manufacture of concrete. RCA are composed of an intimate mix between aggregates and hardened cement paste (HCP). Hardened cement paste is much more porous than the natural aggregates and the properties and proportions of HCP largely influence the properties of RCA. As a consequence, the fine fraction of RCA (FRCA), essentially composed of mortar and cement paste, possesses a large water demand which makes it harder to recycle into concrete.The objective of this research is to better understand the role played by HCP on the properties of RCA in relation with the improvement of the characterization methods of these materials and their reuse in the manufacture of mortar or concrete. Firstly, an experimental method based on salicylic acid dissolution allowing to determine HCP content of FRCA is developed. FRCA properties are then studied as a function of hardened cement paste content, particle sizes and properties/composition of the original concrete. From the obtained relationship between water absorption and cement paste content, the water absorption coefficient of the smaller fraction (0/0.63mm) can be estimated whereas it is difficult to measure. Secondly, different industrial RCA are characterized which allows us to expand the preceding conclusions to “real RCA”, meanwhile, the influence of carbonation on the properties of FRCA is also carried out. Finally, the influence of the saturation state of FRCA on the properties of fresh and hardened mortars and on their microstructure is explored. The recycled mortars with dry FRCA have better compressive strength than that with saturated FRCA, which is confirmed by the study of ITZ properties. The mechanical properties of mortars with different RCA content and replacement fraction are determined. The finer fraction of RCA has a worse influence on the mechanical properties of RAC than the coarser fraction
Chiriatti, Léon. "Etude de l'adhérence armature-béton, influence des granulats de béton recyclé et apport des mesures acoustiques". Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAD040/document.
Texto completo da fonteThe use of recycled concrete aggregate (i.e. aggregate produced from concrete demolition rubble) has a significant impact on the mechanical behavior of reinforced concrete members. This work focuses on the influence of recycled concrete aggregate on rebar-concrete bond. First, an analytical madel of the rebar-concrete bond is developed. The original feature of this modellies in the limited number of non-free physically-based parameters on which it is based. These parameters are then experimentally determined through a pull out test campaign. Three types of concrete, including two recycled aggregate concretes, are studied. Pull-out test monitoring is completed by acoustic measurements in order to obtain data from inside the concrete bulk, where the reinforcing bar is located
Hussain, Hallshow. "Etude de la composition, du comportement mécanique et de l'endommagement d'un béton recyclé". Caen, 2002. http://www.theses.fr/2002CAEN2006.
Texto completo da fonte