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Academic literature on the topic 'Chlorure. carbonatation'
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Journal articles on the topic "Chlorure. carbonatation"
Nicula, Liliana Maria, Ofelia Corbu, Mihai Iliescu, Andrei Victor Sandu, and Andreea Hegyi. "Study on the Durability of Road Concrete with Blast Furnace Slag Affected by the Corrosion Initiated by Chloride." Advances in Civil Engineering 2021 (January 13, 2021): 1–16. http://dx.doi.org/10.1155/2021/8851005.
Full textAldawsari, Salem, Raphael Kampmann, Jörg Harnisch, and Catharina Rohde. "Setting Time, Microstructure, and Durability Properties of Low Calcium Fly Ash/Slag Geopolymer: A Review." Materials 15, no. 3 (January 24, 2022): 876. http://dx.doi.org/10.3390/ma15030876.
Full textMartínez-Ibernón, Ana, Paola Antonaci, and Giovanni Anglani. "Initial proposal of a smart cement-based material to enhance the service-life of reinforcement concrete structures." MATEC Web of Conferences 378 (2023): 05003. http://dx.doi.org/10.1051/matecconf/202337805003.
Full textRamón, José Enrique, José Manuel Gandía-Romero, Manuel Valcuende, and Román Bataller. "Integrated sensor network for monitoring steel corrosion in concrete structures." VITRUVIO - International Journal of Architectural Technology and Sustainability 1, no. 1 (June 21, 2016): 65. http://dx.doi.org/10.4995/vitruvio-ijats.2016.5191.
Full textDissertations / Theses on the topic "Chlorure. carbonatation"
Saillio, Mickaël. "Interactions physico-chimiques ions-matrice dans les bétons sains ou carbonatés : influence sur le transport ionique." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1033/document.
Full textCarbonation and chloride ingress are the main causes of reinforced concrete degradation. A lot of studies describe these two phenomena separately but only few studies state a possible coupling. However, the coupling of both phenomena exists. The corrosion of reinforcement due to chloride ions occurs more often in marine environments or in the presence of deicing salts while carbonation occurs systematically, in a more or less high degree depending on environmental conditions (humidity, temperature…). The aim of this thesis was to quantify the different phases of the cement matrix and its chloride binding by means of chloride binding isotherms for carbonated and non-carbonated cement based materials. These chloride binding isotherms, obtained by the equilibrium method, showed that the partially or totally carbonated cement matrix are bound fewer chlorides than the non carbonated ones. Complementary techniques such as the thermogravimetry (TGA), the X-rays diffraction (XRD) and the nuclear magnetic resonance (NMR) analyses were used and allowed to understand why this binding decrease occurs. A decrease of Friedel's salt and chlorides bound in the C-S-H was showed in the carbonated materials. These decreases were quantified and are due to a modification of the phases containing chloride (such as aluminates, sulfo-aluminates and C-S-H phases) during carbonation process. The porous network, was observed by mercury intrusion porosimetry (MIP), was also modified (decrease of the macroporosity and the connectivity for carbonated cement matrix due to formation of calcium carbonate). The other aim was to correlate all these modifications with the ions transport properties. Chloride diffusion and migration tests (with or without sulfates) were obtained as well as the measurements of electric resistivity. The experimental results showed that the apparent chloride diffusion coefficient is higher in the carbonated cement materials. Some diffusion tests were performed in presence of both chlorides and sulfates, which showed the competition of these two ions to bind on the cement matrix. Cement materials (concrete and cement paste) were designed without or with supplementary cementing materials (metakaolin, fly ash, slag) and the properties of these materials were followed at different curing time
Tissier, Yolaine. "Etude des processus de corrosion et de la réparation par traitement électrochimique d’extraction des ions chlorure dans les bétons armés doublement contaminés (carbonatation et chlorures)." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1207/document.
Full textReinforcement corrosion is known as the first cause of reinforced concrete degradation in the fields of civil engineering structures and historical monuments. Corrosion occurs when concrete cover is carbonated or when chloride ions are present in sufficient quantity at the reinforcement vicinity.The main objectives of this thesis are to investigate the corrosion processes of the reinforcement when the concrete is contaminated by carbonation as well as chloride ions and to evaluate a cathodic electrochemical treatment as a repair solution.To meet these objectives, three phases were investigated: (1) artificial agings, (2) an electrochemical chloride extraction (ECE) treatment and (3) durability. For each of these phases, the evolutions (1) of the rebar corrosion in concrete, (2) of the corrosion products at the reinforcement/concrete interface and (3) of the cementitious matrix were studied.The scientific approach gathered multiple analyzes at different scales and the use of non-destructive, destructive or in situ technique. It allowed to study the corrosion processes before and after treatment and to discuss results according to efficiency criteria suggested.The study was carried out taking into account two cements (CEM I and CEM III/A) and considering two modes of artificial aging. More than three hundred specimens of reinforced micro-concrete, corresponding to four concrete designs, were therefore studied. The main techniques used were non-destructive electrochemical characterizations, SEM and EDS characterizations, destructive quantitative determinations (chloride ion content) and qualitative determinations (pH evaluation), and finally Raman microspectrometry to determine the nature of the corrosion products.The results highlighted some evolutions of different characteristics studied during the phases of the study. Before treatment, the concrete cover was entirely carbonated and the free chloride content at the reinforcement level was in the range of 0.9-2.1% by weight of cement depending on the concrete design. A 10 μA/cm² average corrosion currents was reported and a homogeneous corrosion layer thickness of about 5-10 μm was observed. During in situ Raman analysis, chloride green rust was identified indicating an active corrosion.After treatment, more than 90% of the chloride ions were extracted and the thickness of the concrete which had a pH value higher than 9 around the reinforcement, was about 1 cm. The corrosion currents became less than 0.1 μA/cm² (negligible corrosion level). The formation of magnetite was mostly observed with nevertheless a local presence of residual green rust. No significant deleterious evolution of the cementitious matrix was identified. The treatment efficiency was therefore demonstrated. The evaluation of the treatment durability over a period of 4 to 12 months showed that the electrochemical characteristics remained stable. On the other hand, a decrease in the concrete area which pH increased during the electrochemical treatment was observed for CEM III/A cement which could lead to a corrosion recovery over the longer term. Finally, the in situ Raman study revealed differences in durability as a function of the treatment duration
Nguyen, Thi Thu Trang. "Influence de l'effet de l'interface acier/béton (top-bar effect) sur la corrosion de structures en béton armé exposées en environnement de chlorures ou de carbonatation." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEI009.
Full textReinforced concrete is known one of the most popular materials applied in construction. Nevertheless after a period of time it can be corroded. Chloride and carbonation are the main factors causing to corrosion in reinforced concrete structure. The thesis aimed to study the corrosion behavior of reinforcement concrete under carbonation or chloride environment, corresponding to the influence of top-bar effect, the cement type as well as artificial transverse crack or load-induced cracks.In general carbonation induced corrosion is usually researched from the point of view that it generates uniform corrosion. The first objective of the thesis is to confirm the opinion of macro cell or non-uniform corrosion in carbonated induced corrosion. According to the results of experiments in this part, corrosion rate in carbonated concrete reinforcement is likely to consider from the point of view of both uniform and macro cell corrosion, which is highly influenced by the ratio cathode/anode. In addition the application of CEM III using slag as addictive exhibited reduction of non-uniform corrosion effectively.The second part focuses on the influence of top-bar effect on corrosion behavior in the case carbonation induced corrosion and presence of load induced crack. Macro cell corrosion current monitoring was utilized in the experiment following the loss of mass as well as corrosion kinetic was calculated. Corrosions mainly developed at the position of the pre-cracks. Due to the top-bar effect upper bars were more corroded than bottom bars. Current corrosion value of top bars was observed higher than bottom bars. Loss of steel mass calculated from macro cell current measurement corresponds to only to a small part of the total loss of mass determined by gravimetric measurement. Uniform corrosion appears to be the main phenomena.The last part investigates the effect of top-bar effect in fibers concrete samples with or without artificial crack on chloride induced corrosion. The top steel bars are more corroded than the bottom bars and the upper part of the top bar is recorded higher corrosion than the lower part. In presence of artificial crack the top casting effect results that corrosions spread along the surface of the steel bars. Corrosion also spread along the top bar when there is no artificial crack, in a time not so different from the case of artificial crack. It confirms that top surface exposure and top bar effect are highly prejudicial for corrosion. By comparing the behavior with concrete without fibers, it appears that the addition of fibers in reinforced concrete leads to an increase of resistance to corrosion induced cracking.For each part, experimental observations are coupled with numerical simulations to compare as well as demonstrate the experimental results
El, Farissi Anass. "Prédiction de la durée d'utilisation des ouvrages en béton armé par une approche performantielle dans le cas de la corrosion induite par la carbonatation ou l'attaque des ions chlorure." Thesis, La Rochelle, 2020. http://www.theses.fr/2020LAROS025.
Full textSteel reinforcement corrosion is the major cause of failure in reinforced concrete structures. This electrochemical process is induced by presence in sufficient quantity of chloride ions at the reinforcement or by concrete carbonation (CO2 action). This thesis aims to develop engineering performance-based models for the service life prediction of reinforced concrete structures subjected to chloride-induced or carbonation-induced corrosion initiation and propagation. It consists in developing three models : a chloride ions ingress model, a carbonation model and a corrosion model that allows to estimate the corrosion initiation time and propagation time. These models consider factors related to the material (i.e. durability indicators), processing, environment and geometry. The approach used to develop these models is based on using several literature databases of ageing structures and concrete testing specimens (BHP-2000, Perfdub, etc.). The use of these data allowed to improve the predictive capacity of existing models (chloride ingress model) and to develop new models (carbonation and corrosion models)
Schmitt, Emmanuel. "Approche performantielle et microstructurale de la durabilité de bétons à base de ciments sulfoalumineux-bélitiques ferriques." Thesis, La Rochelle, 2014. http://www.theses.fr/2014LAROS027.
Full textCalcium sulfoaluminate (CSA) cements can be a solution to improve the environmental impact of concrete, thanks to the lower energy consumption and CO2 emission during their production. Their expansive, fast setting and rapid hardening properties contribute to the growing interest of engineers for concrete construction and prefabrication. However, the durability of sulfoaluminate concretes is not clearly assessed yet, especially in acidic and marine environments, as well as carbonation and chloride induced rebars corrosion. Thus, the aim of this thesis is to study and compare the durability, related to these attacks, of concretes made with CSA cements to ordinary Portland and GGBS cements based reference concretes. This study is founded on microstructural (solid phases, porosity) and performancial (durability indicators, natural and accelerated tests) characterization. Beforehand, the application of these characterizations to CSA concretes is verified and discussed. These show a good resistance to acidic environments when submitted to dynamic leaching tests at pH 3 and 5. The study of chloride ingress (steady and non-steady state migration, binding isotherms and tidal zone exposition) and carbonation (natural and accelerated) in concretes of 8 different laboratory CSA cements enabled us to find achievable means to improve their potential durability. These means were applied to the production of a performant industrial CSA cement, whose good durability has still to be assessed on field conditions
Saillio, Mickaël, and Mickaël Saillio. "Interactions physico-chimiques ions-matrice dans les bétons sains ou carbonatés : influence sur le transport ionique." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00777946.
Full textSalesses, Bernard. "Durabilité des matrices ciment Portland - laitier de haut-fourneau activées par des chlorures." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30297.
Full textGround granulated blast-furnace slags (GGBS) are used in cements in particular because of the overall improvement in the durability of building materials. However, binders with a high content of GGBS have a slower hydration and thus a development of mechanical strength slower than Portland cements (PC). Solutions exist to accelerate the hardening of GGBS-based binders, including the use of chemical activators based on chlorides. The effects of activation on the mechanical strength developments of PC/GGBS blends are discussed in the literature, but the durability of these systems is not very developed. This thesis aims to evaluate the consequences of the use of chlorides activators on the durability of binders containing 50% of GGBS. Firstly, an analysis of the durability indicators shows how the activator modifies the transfer properties of the hardened material as well as the structuring of the porous network. This allows to verify that the activation at early age does not decrease the long-term durability of concretes with GGBS. Then, a study of the corrosion state of steels in these blends is realized to evaluate the impact of chlorides activators, known to initiate corrosion in reinforced concrete. Electrochemical tests coupled with direct observation as well as a microstructural study on how interact chlorides in the cement matrix are carried out. The ability of GGBS-based blends to bind chlorides in hydrates is studied in particular. Finally, the behavior of binded chlorides is analyzed, in the case where the carbonation would destabilize the hydrates. The impact of a possible release of chlorides is evaluated using a coupled model carbonation / chloride diffusion
Mai-Nhu, Jonathan. "Corrosion des armatures du béton : couplage carbonatation-chlorures en présence de cycles hydriques." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2059/.
Full textMastering and optimizing the durability of concrete structures and especially prefabricated products is a major challenge for the entire profession. The goal of this work is to focus on the knowledge and the needs for assessing the performance of the reinforcement to the corrosion phenomenon and to heighten the mechanisms comprehension. Finally, this work allows coming up with a model able to simulate the penetration of chlorides in saturated environment or with wetting-drying cycles, the carbonation, the combination between these two mechanisms and the reinforcement corrosion in variable hydric conditions. A huge experimental campaign leads to a complete characterization of the mechanical, chemical and physical properties of several concretes and their performance towards to the main aggressive environment for the reinforcement corrosion. The final goal of this research project is to come up with a comprehensive and accurate model which should be able to consider all the most important coupled phenomena linked to the concrete durability, from the penetration of aggressive species to the real initiation of the corrosion phenomenon. First practical applications will consist in assessing the lifetime of the concrete structures in a probabilistic way and optimizing the design of concrete cover thickness by taking into account the intrinsic properties of the materials and the environmental conditions. This work allows quantifying the gain in durability performance of concrete product exposed to a risk of reinforcement corrosion obtained by increase the density level, optimize the cast process, or optimize the characteristic of the binder
Hamdan, Ziad. "Evolution de la corrosion des aciers du béton armé en ambiances agressives." Toulouse, INSA, 1993. http://www.theses.fr/1993ISAT0024.
Full textAchour, Mohamad. "Modélisation du couplage carbonatation – chlorures et étude multiéchelle de l’influence des granulats sur la diffusivité dans les bétons." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0049/document.
Full textThe corrosion of steels is one of the principal causes of degradation of reinforced concrete structures, especially in front of the sea. This degradation is due to the diffusion of chloride ions that can occur in the structures immersed in the seawater, those undergoing tidal cycles and also those subjected to the sea spray. The corrosion can also be due to the carbonation process of the concrete, which is responsible for decreasing of the pH and consequently the depassivation of the steels. This thesis proposes a physicochemical model to describe the penetration of aggressive agents in the first period of steel corrosion. This so-called « incubation » period corresponds to the period during which the transfer of aggressive species occurs in the concrete. In order to clearly identify the transport parameters of thismacroscopic model, a multi-scale approach is implemented to consider the diffusion in concretes. This approach is based on taking into account the detailed description of the microstructure of the concrete (constituents and morphology) by upscaling methods. This multi-scale approach is intended to be the most comprehensive with the consideration of the influence of the water-to-binder ratio of the cement paste, the properties of the aggregates and the transition zone between the cement paste and the aggregates. After identifying all the input parameters, the macroscopic physico-chemical model is used to evaluate the service life of a concrete subjected to coupling carbonation -chlorides in unsaturated medium. Following a validation of the model compared to experimental results, several applications of this model are presented