Дисертації з теми "Granulats de béton recyclés"
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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
Adessina, Ayodele. "Caractérisation expérimentale et modélisation multi-échelle des propriétés mécaniques et de durabilité des bétons à base de granulats recyclés." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1100/document.
This thesis combines experimental and theoretical approaches to characterize the mechanical and durability properties of recycled aggregate concretes (RAC). The first part of the work is devoted to the quantification of the impact of recycled concrete aggregates on the mechanical and durability properties of RAC. The results show that mechanical and durability properties of recycled aggregate concretes depend not only on the physical properties of recycled concrete aggregates but also on their quantity in the microstructure. Furthermore, statistical indentation technique is used to capture the local mechanical properties of phases in the microstructure of RAC such as the interfacial transition zones and the attached mortar. The second part of this study deals with the multi-scale modeling of the mechanical and the durability properties of RAC. The main purpose of this theoretical work is to establish models capable to predict the macroscopic behaviour based on the available information on the microstructure (obtained by optical microscopy or through indentation technique). The established models take into account the complex structure of the recycled concrete aggregates. Finally, the results of the models are compared with experimental data for discussion
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.
Omary, Safiullah. "Effet de l'incorporation des granulats recyclés sur le comportement et la durabilité vis-à-vis du gel-dégel des bétons." Thesis, Cergy-Pontoise, 2017. http://www.theses.fr/2017CERG0871.
Development in many sectors has negative environmental effects. In construction sector, there are millions of tonnes of construction and demolition waste (CDW) every year. This CDW has a significant damage on the environment and may endanger its sustainability. To find a conceivable solution for CDW and to preserve the natural resources, particularly the non-renewable ones, worldwide researches on recycled aggregates have been increased in order to investigate their revalorization possibilities in concretes.As many developed countries, France also has introduced legislations and strategies to reduce the environmental effects of CDW. Corresponding to problem of CDW, there are two national project called PN-RECYBETON and ANR VBD2012-ECOREB that deal with how to provide concretes for building field using aggregates provided from CDW.This work aims to determine the durability of recycled aggregate concrete by freeze/thaw cycles. Four types of concrete were prepared by varying the replacement ratio of natural aggregates (NA) by recycled one (RA). The volumetric substitutions rates are respectively 0%, 33%, 55% and 100%, while the concretes mix design were adjusted in order to achieve the same consistency class of S4. Furthermore, we also studied the durability of these concretes varying the air content through an air entraining agent.After characterization of physical and mechanical properties of NA and RA, we found that the water absorption capacity of RA is 10 times greater than that of NA due to a low density. Moreover, the RA presents poor mechanical résistance by LA, MDE and freezing action.These poor performances of RA can be explained by the existence of pores and crack in old cement paste that provided during production process. The microstructure of RA was analyzed by SEM.Regarding to the influence of RA in mix design, with total substitution the density of hardened decrease 17% while the porosity become two times greater than those of natural concrete.In addition, the mechanical properties of studied concretes mix design decreases through the incorporation of RA. Regarding to the transfer properties, the gas permeability of the concrete 100% substitution is 2 times higher than that of reference one. On the other hand, the electric resistivity decreases with increasing of RA content.The Air-Entraining agent has a significant effect on the compressive and the splitting tensile strengths. It is observed that with 6% of air content the mentioned mechanical properties decrease drastically (a diminution higher than 50%). The increase of RAC content in the mixtures decreases their freezing/thawing resistance.The introduction of Air-Entraining agent improves the freezing/thawing resistance of concrete. The air-entrained concrete with 50% and 100% of RA present the poor performance than that of reference concrete via the studied durability indicators. Moreover, the air-entrained concrete C35/45 30R-30R with 4% and 6% of air content show the similar performance as air-entrained control concrete
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.
Recycled 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
Deodonne, 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.
Promoting 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
Tijani, Karaa. "Évaluation technique des possibilités d'emploi des déchets dans la construction : recherche expérimentale appliquée au cas de béton fabriqué à partir de granulats de bétons recyclés." Paris 6, 1986. http://www.theses.fr/1986PA066231.
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.
The 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
Tahar, Zine-el-abidine. "Optimisation des caractéristiques rhéologiques, mécaniques et thermiques des bétons à base de granulats recyclés avec différents couples ciment/adjuvant." Thesis, Cergy-Pontoise, 2016. http://www.theses.fr/2016CERG0841.
With the growing need of building material resources and requirements in terms of environmental protection in a vision of sustainable development, it has become necessary to explore all possibilities for the reuse and recycling of and industrial waste products, especially in the field of construction and public works.Mortars and concrete made from recycled aggregates were the subject of numerous studies. However, no general rule has been identified to quantify the influence of such substitutions on their rheological and mechanical properties. Expanding the use of concrete containing recycled aggregates whose physicochemical properties are different from concrete with natural aggregates, is inevitably backed by increased mastery, on the one hand, of their mechanical properties, and secondly their implementation.The objective of this work is to quantify the influence of the nature and dosage of recycled gravel and sand on the rheological and mechanical properties.To do so, a test campaign was conducted on concrete made with different percentages of substitutions (on the sand and aggregates) and with different combination cements / admixtures. Regarding the rheological properties, the measured parameters are: shear threshold, plastic viscosity, workability, air content and density. Furthermore, in order to follow the evolution of these quantities in the time the tests were carried out at different ages (at the outlet of the mixer, 30 minutes, 60 minutes and 90 minutes after the end of mixing). Regarding the mechanical properties, compression tests were performed at 1 day, 7 days and 28 days. The properties of these concretes were compared to a control concrete.The results show that the properties of recycled concrete aggregates and ECM (Equivalent Concrete Mortar) depend on the couple cement / admixture and the level of substitution on recycled aggregates. This means that there is indeed an influence of recycled aggregate on the compatibility (phisico-chemical equilibrium) of the couple cement / admixture. This influence is most notable on the sand than on gravel. The results also show that for concrete based on recycled aggregate, the higher the percentage of substitution increases, the higher the yield stress and plastic viscosity and the lower the resistance to compression.Keywords: concrete, recycled aggregates, recycled sand, rheology, workability
Pellerin, Frédéric. "Caractérisation des granulats recyclés fabriqués avec du béton de ciment et des enrobés bitumineux pour utilisation dans les fondations routières." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/MQ49118.pdf.
Turcanu, Vasile. "Valorisation des granulats recyclés dans les bétons soumis au gel/dégel sans saturation (classes d’exposition F et R)." Mémoire, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/10479.
Médevielle, Marion. "Utilisation de la bioprécipitation de carbonates de calcium pour améliorer la qualité de granulats de béton recyclé." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0031/document.
Sands produced from demolition wastes (RCA) have a significant porosity due to the residual mortar resulting from the primary concrete. This is a brake on their recycling in concrete, as would be desirable to develop the circular economy of the sector. The natural carbonation byair of RCA is known to improve their performance. On the other hand, it is very slow and the associated storage constraints are not industrially acceptable. In addition,calcifying bacteria have been used for years to improve soils or monumental stones. In this context, the object of this thesis is to develop a method of accelerated calcification by deposition of bacteria on the surface of RCA This thesis is divided in 2 phases:- Selection and adaptation to pH12 of alkalophilic bacteria with the study of their growth and theirCaCO3 production yield, in vitro, in different environments (pH, urea or not, calcium concentration…) - RCA and mortar disk treatment with different processes whose efficiency is evaluated by a diminution of the material porosity. At the end of this work, a bacterial strain with a satisfying calcific production in contact with RCA was identified. However, the porosity reduction of the treated RCA porosity remains limited. The observations made show that this is linked to a heterogeneous deposit of calciumproduct on the surface of RCA. To conclude this work,several areas to be explored are proposed to improve the process
Boulay, Vincent. "Valorisation des matériaux granulaires recyclés dans le béton de ciment pour usage résidentiel." Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5917.
Serifou, Mamery. "Béton à base de recyclats : influence du type de recyclats et rôle de la formulation." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR15230/document.
Waste management is an important issue for Côte d‟Ivoire. Among many possibilities, recycling wastes as aggregates for concrete is a solution that deserves to be evaluated. In this study four recycled aggregates are tested: crushed glass, tire cut rubber, hardened cement and fresh concrete waste. There properties are compared to those of natural aggregates.A first study is realized in Côte d‟Ivoire on glass, rubber and hardened cement. Concrete is realized and tested in compression (cylindrical 16x32 specimens). A mix with an increasing quantity of coarse aggregates is tested for each recycled material (20 %, 25 %, 30 % and 50 % in mass of fine and coarse aggregates). It is shown that the strength decreases with the replacement rate and that the decrease depends on the replacing material. The materials ranged in the following increasing order: rubber, glass, hardened cement and natural aggregates. A power law is established which gives the compressive strength as function of the mix and the materials characteristics. Analytical modeling was proposed for predincting the strength with respect to recycled aggregates size and volume.Another experiment is also made on glass and rubber, where partial replacement in increasing percentage is tested. Natural aggregates are partially replaced in the mix with the ranges of 5, 10, 20, 25 and 30 % by rubber and glass. The compressive strength is determined and a decrease is observed for the two materials. In the case of rubber a high decrease in observe with the replacement. In the case of glass a decrease occurs between 0 and 5 % replacement then the strength remains constant with the replacement rate. The third experiment is made with partial replacement of fresh recycled concrete (excess of ready-mixed concrete from concrete mixing plant which is hardened and then crushed). A plan of experiments is made which allows a polynomial law to be drawn giving the strength as a function of the recycled proportion. Other properties (Young modulus, P wave velocity, porosity, density, etc) have been determined and their relation with replacement rate computed
Serifou, Mamery, and Mamery Serifou. "Béton à base de recyclats : influence du type de recyclats et rôle de la formulation." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00962148.
Hasnaoui, Abdelaziz. "Optimisation d'un géopolymère à base de laitier et de metakaolin pour la rélisation d'un béton de structure." Thesis, Cergy-Pontoise, 2019. http://www.theses.fr/2019CERG1019.
This work concerns the behavior of slag and metakaolin based geopolymer concrete formulated using a sodium silicate solution as activator. The first part of the study focuses on the optimization of the geopolymer cement. To achieve this objective, a reference Portland mortar and twenty-four geopolymer ones were developed by varying the Slag/Metakaolin weight ratio (25/75, 50/50, 75/25) and the molar ratio SiO2/Na2O, RM, of the alkaline solutions (RM between 1.0 and 2.0). The mortars were characterized in the fresh state (workability and setting time) as well as in the hardened state in terms of flexural and compressive strengths, modulus of elasticity and porosity. The results showed that the geopolymer binder composed of 50/50 Slag/Metakaolin with a molar ratio RM of 1.8 allows obtaining a more resistant mortar than the reference one while ensuring a good workability and an excellent stability against efflorescence.The second part of the work deals with the behavior of geopolymer concrete, synthesized with the binder optimized in the first part of the thesis. In addition, the effect of curing conditions and the influence of recycled aggregates incorporation on the performance of these concrete were evaluated. Indeed, three curing methods were chosen, 20°C and 50% RH, 20°C and 90% RH and a total immersion in water at 20°C. For recycled aggregates valorization, three volumetric substitution ratios were selected: 10, 30 and 50%. For all materials, the properties in the fresh state and the physical and mechanical properties in the hardened state were studied. As regards the influence of recycled aggregates, it has been shown that their introduction induces a decrease in compressive and tensile strengths. However, at low substitution ratios (less than 30%), acceptable rheological and mechanical performances are obtained.The obtained results show that curing in a low relative humidity leads to poor physical and mechanical performance compared to hardening at high relative humidity and total immersion in waterThe experimental results of this work as well as a considerable number of results reported in the literature allowed to evaluate the reliability of the empirical equations developed for the prediction of the mechanical properties of Portland concrete. For the prediction of the tensile strength of geopolymer concrete, the proposed equation for Portland concrete remains applicable. Nevertheless, a new equation has been proposed for the prediction of the elastic modulus
Souche, Jean-Claude. "Etude du retrait plastique des bétons à base de granulats recyclés avec mesure de l'influence de leur degré de saturation." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS097/document.
In the context of sustainable development, the reuse of construction and demolition waste is necessary to conserve nonrenewable natural aggregate resources, so recycled aggregates are introduced in concrete mix design. This is the aim of the national projet RECYBETON and the research project ECOREB. This study deals with the fresh concrete and more specifically with shrinkage control and the effects of the initial saturation degrees of recycled coarse aggregates on concrete behavior.Two concrete families, with two different water/cement ratios 0,60 and 0,45, are tested under endogenous and drying (wind speed equal to 8 m/s) conditions. Each concrete family contains a reference natural concrete and two recycled concretes. The initial saturation degree is the difference between them (recycled coarse aggregates saturated or semi saturated).Experimental results underline the capacity of non-saturated aggregates to quickly absorb water from cement paste, modifying the W/C ratio, rheological properties of the fresh concrete and the mechanical strength (at 28 days) of recycled concretes. After saturation in water, recycled aggregates can release water into the cement paste if the undergone drying conditions lead to a lack of water in the cement matrix. The recycled coarse aggregates can be seen as an internal curing potential.Experimental plastic shrinkage studies carried out under drying conditions highlight a link between bleeding, capillary pressure, plastic shrinkage and cracking. It should be pointed out that the initial cracking is dependent on the total quantity of water in the concrete and on its bleeding capacity. The opening cracks vary with the plastic shrinkage values measured during the test. The analysis of the results emphasize that the capillary pressure is the determining parameter and that the air entry value matches the cracks. The major behavior differences are found between concretes with different volumes of water rather than between natural and recycled concretes.Finally, the analysis of all the experimental results have allowed concrete modelling and understanding why concretes do not behave in the same way. When it cracks, the air come in the biggest pores of the concrete paste. Moreover, a hygrothermal coupling exists between the drying and the temperature in concrete. It can affect hydration start up
Maimouni, Houda. "Suivi des échanges d’eau dans un mortier de sable recyclé modèle à l’état frais par une approche rhéologique." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0045.
The increased interest in concrete recycling results from a willingness to reconcile the construction industry with sustainability. Recycled concrete aggregates (RCA) consist of a mix of natural aggregates and attached cement. The high porosity of RCA modifies the effective water content of a recycled concrete at the expense of its fresh and hardened performances. A testing method based on spread measurements is suggested to follow quantitatively water transfers between RCA sand and a fresh cement paste. This protocol is tested on cement paste sands (CPS) having 0.3, 0.5 and 0.7 water/cement ratios (W/C). Results show that the saturation degree of CPS embedded in a filler paste reaches a maximum no later than 6 minutes then remains quasiconstant. The saturation degree increases with the W/C of CPS ratios but remains less than 1. Moreover, similar water transfer kinetics are found whether initially dry CPS are immersed in a filler or a cement paste. The established protocol assumes a correlation between spread and effective water content of a mortar. In order to study this correlation, on the one hand, under the lubrication approximation, the yield stress of mortars is calculated from their spread radius. On the other hand, yield stress of mortars is calculated using a biphasic modelling of mortars viewed as non-colloidal suspensions in a yield stress fluid. Consistency between the two approaches is examined
Zhao, Zengfeng. "Valorisation des sables de béton recyclé pour la fabrication de mortiers." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10004/document.
Very 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
Le, Thang. "Influence de l’humidité des granulats de béton recyclé sur le comportement à l’état frais et durcissant des mortiers." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10160/document.
Improved techniques of characterization of recycled concrete aggregate (RCA) and a better understanding of the properties of concrete based on RCA would promote their use. The aim of this work is to study the influence of the state of saturation of RCA, especially of recycled sand, on the fresh and hardened behavior of mortars. The first part of this work is dedicated to the study of water absorption of recycled sand (RS) by different methods. The results show that the water absorption of RS is greater than that of natural sand (NS). However, the water absorption value of the RS is closely related to the used method and the pre-saturation mode. The second part is dedicated to the influence of the saturation state of aggregates on the workability of mortars. The results show that the initial saturation state, the pre-saturation mode and the pre-saturation time significantly influence the workability of the mortars. The influence of the saturation state of recycled aggregates on the hardened behavior of mortar is then studied with two mortars based on recycled dry or over-saturated sand. The microstructure is explored by scanning electron microscopy (SEM) followed by image analysis and by indentation test under the SEM. The compressive strength of mortars containing RS is lower than that of mortars made with NS. Moreover, the initial saturation state of RS does not influence significantly the compressive strength of mortars, the mean porosity of the new interfacial transition zone (ITZ) and the micro-hardness of the cement matrix. However, the saturation state influences significantly the distribution of meso-porosity in the new ITZ
Hussain, Hallshow. "Etude de la composition, du comportement mécanique et de l'endommagement d'un béton recyclé." Caen, 2002. http://www.theses.fr/2002CAEN2006.
Ben, maaouia Oumeima. "Aptitude des granulats issus des bétons de déconstruction à la réutilisation, vis-à-vis du CrVI : Impact des propriétés de la matrice cimentaire et identification des mécanismes de relargage." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1164.
In France, it has been numerated more than 340 Million Tons of deconstruction wastes in the field of civil and public works.Among of these wastes, which are prone to be recycled if they are inert, are old aggregates concretes, especially which were produced in the 1960’s. The manufacturing process of cement on an industrial scale was similar to what is done today. Where, it cannot be excluded that these concretes may contain hexavalent chromium. However, the directive 2003/CE/53 concerning the production of cement limits the content of hexavalent chromium to 2 mg per kg of dry matter. Therefore, it is essential to study, before any upgrading project, the atmospheric interactions with the cement matrix and the degradation by rainwater during their landfill or during their life cycle.The thesis work takes part of a feasibility study on the recycling of waste deconstruction containing Cr (VI) and having undergone different types of natural degradations, including atmospheric carbonation. An environmental impact study has been performed on the basis of leaching tests on monolithic and granular materials. In addition, pH impact study on release conditions was also performed. The interpretation of the experimental results is based on the use of kinetic models, in particular the model of Côte & Constable (1985), as well as the solutions of interpretations graphs of the known different standards.The experimental campaign is focused on mortars confectioned from aggregates recycled at 30% and 100% substitution rates as well as recycled aggregates in the gross state. The obtained results are shown that the materials studied (mortars or aggregates alone) are inert with respect to the release of hexavalent chromium. t has been shown, independently from the origin of the recycled aggregates, their chemical composition, their mineralogy and their substitution rate in mortars, that the release of chromium hexavalent remains negligible. Similarly, an in-depth study was conducted on the chromium structure within the cementitious matrix under these two stable forms, trivalent and hexavalent. The results showed that chromium tends to stabilize in ettringite, with structure called Cr-ettringite in the case of Cr (VI) and in bentorite structure in the case of Cr (III).Finally, it has been shown that the cement matrix carbonation has an aptitude to trap and immobilize Cr (VI)
Moreno, Juez Jaime. "Optimisation du procédé de malaxage du béton : suivi et contrôle." Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0032.
The concrete mixing corresponds to the stage of the manufacturing process which consists in homogeneously distributing and wetting (structuring) all the components present in the mixer. Parameters influencing the mixing are still relatively uncontrolled while the properties of concrete are strongly related. After a literature review, a database provided by a central ready-mix concrete plant is analyzed to identify the factors affecting the properties of concrete produced industrially. Then, a first experimental study aims to better understand the degradation of the recycled concrete aggregates during the mixing of new concretes, depending on certain parameters such as mixing speed and time, type of agitation, resistance to abrasion of aggregates ... Finally, a second experimental study brings new elements to the understanding of the mixing evolution in function of process parameters (time and speed of mixing, temperature) and formulations (water dosage, dosage and gravel type). In this context, an innovative image analysis technique allowing on-line monitoring of the concrete mixing evolution has been developed. The technique has thus been validated on laboratory scale and on real scale
Tran, Duc Long. "Impact of intrinsic granular porosity on the durability properties of concrete." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30021.
The preservation of natural resources and the limitation of CO2 emissions are a contribution to sustainable development. In the context of the concrete design, this contribution consists in using local or recycled aggregates. However, local or recycled aggregates can be porous and of low quality.The scientific community agrees that the intrinsic porosity of aggregates changes the transport properties of concrete, but to what extent is still a question. The objective of the thesis is to analyze the impact of intrinsic coarse aggregate porosity on mainly the durability properties of concrete. In a preliminary understanding and with a view to accentuating phenomena occurring in the concrete, an experimental program is designed for elementary model (EM), which is composed of paste and gravel. The impact of the aggregate nature (porous and non-porous), moisture state and volume together with the binder nature, is analyzed on i) the water porosity of EM, ii) the structuration of the paste-aggregate interface. Next, at concrete scale, materials were designed with the same skeleton of aggregates (same sand) and the same equivalent binder content. The designs varied by the aggregate nature, moisture state, the binder nature, the variation of water/cement ratio and the incorporation of chemical admixtures (plasticizer or superplasticizer). The impact of coarse aggregate porosity on properties in the fresh state (slump, apparent density and entrapped air content) and in the hardened state (compressive strength, water porosity, water absorption, gas permeability, chloride migration, accelerated carbonation and Portlandite content) was studied. The main results show that the moisture state of aggregate and the binder nature are the first factors that condition the structuring of the paste/aggregate interface within the elementary model. The necessity to use porous aggregates in saturated surface dry is particularly highlighted. At the scale of concrete, the properties in the fresh state are influenced by the aggregate porosity and the water/binder (W/B) ratio. However, for a fixed W/B ratio corresponding to fluid consistency, the variations in the fresh properties measured when porous aggregates are incorporated do not depend on the binder nature. In hardened concrete, porosity of aggregate plays an important role in water porosity and air permeability of concrete whatever the nature of binder. For other durability properties (water absorption, Clo migration, carbonation and compressive strength), the nature of binder overcome leading in comparison to the porosity of aggregate
Bouquety, Marie-Noëlle. "Étude de la morphologie des granulats et caractérisation par ombroscopie." Nantes, 2003. http://www.theses.fr/2003NANT2113.
Dao, Duc-Tung. "(Multi-) recyclage du béton hydraulique." Ecole centrale de Nantes, 2012. http://www.theses.fr/2012ECDN0035.
The use of recycled aggregate in the new concrete will contribute to the solution of demolished concrete within the framework of the sustainable development. However, its application in the construction sector is still limited by the limited knowledge of the properties of recycled concrete. It is the purpose of this thesis to promote the use of recycled aggregate by a better understanding of the influence of such aggregate on the performance of concrete. The relationship between the properties of recycled aggregate concrete and those of recycled aggregate concrete was also evaluated. The study was carried out using three generations of concrete which were made by natural aggregate or recycled aggregates or recycled aggregate by second time (multi-recycled). The concrete production and the aggregate generation by crushing were conducted in semi-industrial condition. With these materials, many mixes of concrete were designed and cast by the mix design method of the laboratory with several variable parameters (proportion of recycled aggregate, shrinkage reducing admixture…) to find out the methods to improve the properties of recycled concrete. They were investigated by the physical properties and the durability. The results of these experimental studies were followed by a major campaign analysis, in which predictive models for the properties of the recycled aggregate or recycled concrete were developed. They were also applied to the multi-recycled aggregate and concrete. All this knowledge has been reviewed by the successful application on a real case in which an airport slab was rebuilt with 100% recycled aggregate. This research falls within the frameworks of a CIFRE (industrial convention for research training) thesis co-financed by the industry's major players: ATILH, CIMBETON, SNBPE, SPECBEA, UNPG in collaboration with ADP (Paris Aeroport)
Nelfia, Lisa Oksri. "Incorporation de fines issues de granulats recyclés dans la fabrication de nouveaux liants hydrauliques." Thesis, La Rochelle, 2015. http://www.theses.fr/2015LAROS006/document.
This thesis work focuses on the valorization of recycled aggregates as main component for hydraulic binders. This is included in a current issue of waste management, protection of natural resources and environment, reduction of greenhouse gases emissions in cement production. In France, on 260 millions tons of inert wastes produced per year, 90 millions tons are still stored in non-hazardous landfill. This waste deposit has to be reduced to increase the production of recycled aggregates currently estimated at 15 million tons per year. In view of this, this research is aimed to enhance the valorization of recycled aggregates into powder form (Dmax < 80 microns) as a mineral addition in substitution of cement for mortar and concrete or as main constituent of Hydraulic Road Binders (HRB). Two sources of materials are used : a five years old concrete and a recycled aggregates come from a recycling plant. Powders are prepared by crushing and sieving with or without high-temperature heat treatment and characterized (physical, chemical and mineralogical characterizations : residual hydraulic reactivity) to evaluate their potential valorization based on their origin.The first objective, entitled “Conception of mineral addition using powder of recycled aggregates”, deals with of the influence of this new materials on rheological, mechanical and durability properties of mortars. The results of this study allow us to evaluate the benefits of incorporating powder obtained by crushing/sieving of recycled aggregates as cement or limestone substitute used in the composition of a mortar. The second objective, entitled "conception of the Hydraulic Road Binders using powders of recycled aggregates", deals with the design of HRB by a comparative approach with HRB manufactured. The characteristics of binders are tested on mortars and on samples of treated soil and the results show that it's possible to produce an HRB rich in powders of recycled aggregates with or without cement which can efficiently stabilize clayey soils
Casbonne-Renaud, Frédérique. "Comportement aux cycles gel-dégel des bétons de granulats calcaires." Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL053N.
Achour, Taoufik. "Étude de l’influence de la nature des granulats sur les propriétés des bétons hydrauliques : cas des granulats calcaires tunisiens." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10105/document.
This study concerns the Tunisian granular resources, of limestone type, in the hydraulic mixtures. The used materials outcoming from the careers of Aïn Tebournouk, Nahli, Jbel Ressas, El Haoureb, Jradou and Tahent which have to feed the principal centers of consumption of the area of Tunis and the coastal zone of Center-East. The analyzed properties are the compressive and the tensile strengths and the elastic modulus. The recent models of the French LCPC were used to predict these properties. They do not always give satisfactory results, in particular if the mixtures are rich in fine elements, as it is often the case of the aggregates outcoming from careers. The mortars, micro-concretes and concretes carried out within the framework of this study made it possible to propose an extension of these models. For the compressive strength, the bond coefficient was associated with the content of fillers aggregates. The assumption is that the presence of these fine elements, of comparable nature that the aggregates, improves adherence paste and aggregate, thanks to bringing together the properties of rigidity of the two materials. For the tensile strength, a model describes by a hyperbolic law made it possible to provide a physical interpretation to the tensile strength behavior of the hydraulic mixtures. Its parameters are linked to the aggregate strength and cohesion in the paste-aggregate transition zone. Finally for the elastic modulus, the use of the model of the LCPC, which takes into account the properties of the granular phase and the binding phase, made it possible to reach the modulus of elasticity of some aggregates
Cheriet, Taoufik. "Contribution à l’étude du béton arme expansif." Lyon, INSA, 1989. http://www.theses.fr/1989ISAL0057.
Poyet, Stéphane. "Étude de la dégradation des ouvrages en béton atteints par la réaction alcali-silice : approche expérimentale et modélisation numérique multi-échelles des dégradations dans un environnement hydro-chemo-mécanique variable." Marne-la-Vallée, 2003. http://www.theses.fr/2003MARN0193.
Wen, Ziyun. "Formation et caractérisation de sols alcalins de silice : conditions de leur transformation en gel au contact de sels et d'hydroxydes, notamment de ceux qui sont présents dans le béton : étude particulière du rôle de la portlandite." Dijon, 1989. http://www.theses.fr/1989DIJOS037.
Bui, Le Diem Quynh. "Auscultation non destructive des structures en béton atteintes par la réaction alcalis-granulats." Mémoire, Université de Sherbrooke, 2012. http://hdl.handle.net/11143/6160.
Dehaudt, Sylvain. "Étude de la dégradation d'un béton soumis à la réaction alcali-granulat." Lille 1, 2002. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2002/50376-2002-193.pdf.
Hermida, Germán. "Influence du volume de pâte et de la concentration en ciment sur la performance du béton : vers le développement d'un béton à contenu minimal en pâte." Cachan, Ecole normale supérieure, 2008. http://tel.archives-ouvertes.fr/tel-00572748/fr/.
The paste volume or the cement content is a parameter still not well studied regarding the performance of concrete. Actually the majority of the investigations were focused on the quality of the paste and not its quantity. However there is a permanently growing interest to reduce the paste volume in concrete, for environmental and economical reasons. Nowadays some standards define a minimum paste or cement content for certain W/C ratios, but improvements in admixtures and better grading models allow reducing of the cement content/paste volume below these limits. The collection and processing of the bibliography data allowed identifying the effects of the paste volume on some of the principal concrete properties. This research proofed through experiments some of the identified tendencies in the data analysis and it helped to comprehend other still unclear tendencies. When the paste volume is reduced, while maintaining its quality, compressive strength, abrasion, and elastic module grow and workability, bleeding, shrinkage, porosity, capillary absorption and penetration of the chloride ion are reduced. In the evaluated ranges, the reduction of the paste volume did not show effects on the concrete setting times, flexural strength and the progression of carbonation. The use of admixtures of the last generation (polycarboxilate) and an optimal granulate progression using the MEC model, allowed to produce concretes with paste volumes and cement contents below the limits defined by the codes. They have a better workability, mechanic behavior and durability than the conventional concretes
Delannoy, Guillaume. "Durabilité d'isolants à base de granulats végétaux." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1039/document.
The use of insulating materials based on plant aggregates is growing quickly, especially for the rehabilitation of old buildings, thus improving the comfort of residents. These materials have significant thermal, hydric and acoustic properties. However, their development is still limited by the lack of information on the evolution of their long-term performances. Thus, the objective of this study is to evaluate the evolution of the functional properties of hemp concretes, by identifying the aging mechanisms when the material is exposed to different types of environments. For this aim, two hemp concretes formulated with one type of hemp and two binders with different chemical nature are retained. The approach of this study is multidisciplinary (chemical, physico-chemical, microbiological, microstructural, acoustic, thermal and mechanical) and multi-scale. The study of chemical and microstructural properties allows the understanding of the variations of functional properties. Firstly, the initial characterization of the both hemp concretes made it possible to demonstrate the absence of impact of the nature of the binder on the functional properties of the insulators, which can be partly explained by their similar microstructure. A weak mechanical resistance of the materials was also highlighted, related to the inhibition of the setting of the binders because of their interactions with the molecules extracted from the shiv. Secondly, hemp concretes and bulk shiv hemp are subjected to an accelerated aging by imposing cycles of humidification / drying during two years. The modifications of the material performances at different time scales are compared to reference samples stored at 50% of relative humidity and a constant controlled temperature. Under reference conditions, no variation in properties is observed. For accelerated aging, the variations of properties highlighted are induced by several parameters. In the case of bulk shiv, the action of microorganisms and the adsorption of water lead to a loss of mass and to the opening of porosities, leading to variations in acoustic properties. For hemp concretes, no fungal development is observed on the surface of the material. On the other hand, the action of microorganisms is clearly visible inside the plant aggregates, and additional mechanisms are identified: the hydration and carbonation reactions within the binder as well as the mineralization of the vegetal particles cause variations in thermal, acoustic and hydric properties by modifying the microstructure of hemp concretes.In conclusion, the absence of variations in the properties of hemp concretes in the reference conditions suggests that in a real building, their properties can be stable over time, the observed pathologies then being due to a faulty implementation. To go further, the results obtained during this work have to be validated by an in-situ study to be able to estimate the lifetime of these materials
Colas, Jérémy. "Étude de la valorisation des déblais de chantiers de tunnels en granulats à béton." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00806513.
Lepesqueux, Étienne. "Comportement des bétons autoplaçants préparés avec des granulats légers." Mémoire, Université de Sherbrooke, 2011. http://savoirs.usherbrooke.ca/handle/11143/1600.
Duchesne, Josée. "Le rôle des ajouts minéraux face aux réactions alcalis-granulats dans le béton : mécanismes de réaction, performance et essais d'évaluation de la performance." Doctoral thesis, Université Laval, 1993. http://hdl.handle.net/20.500.11794/28933.
Habita, Mohamed Fouzi. "Contribution à l'étude de l'incidence de l'alcali-réaction sur le comportement mécanique des poutres en béton armé." Lyon 1, 1992. http://www.theses.fr/1992LYO10251.
Dorion, Jean-François. "Distribution des ions alcalins et chlore dans le béton, influence sur la réaction alcalis-granulats." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0007/MQ43820.pdf.