FR2990942A1 - Repairing perennial burst concrete having steel corrosion and carbonation, comprises re-coating a high performance stabilized concrete, where high performance concrete is reinforced and stabilized by organic fibers - Google Patents
Repairing perennial burst concrete having steel corrosion and carbonation, comprises re-coating a high performance stabilized concrete, where high performance concrete is reinforced and stabilized by organic fibers Download PDFInfo
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- FR2990942A1 FR2990942A1 FR1201438A FR1201438A FR2990942A1 FR 2990942 A1 FR2990942 A1 FR 2990942A1 FR 1201438 A FR1201438 A FR 1201438A FR 1201438 A FR1201438 A FR 1201438A FR 2990942 A1 FR2990942 A1 FR 2990942A1
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- concrete
- stabilized
- high performance
- reinforced
- coating
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
Description
- 1 - DESCRIPTION L'objet de la présente recherche correspond à une technique de réparation des ouvrages en béton armé, présentant des désordres sous forme d'éclats en surface du béton et de corrosion des armatures, accompagnés le plus souvent de fissures plus au moins importantes. La gravité de ces dégradations réside dans l'alternance de deux phénomènes, fragilisant la structure, et qui s'entretiennent mutuellement : 1. le premier phénomène est la carbonatation du béton qui se traduit par une perte de la valeur basique du PH (12 environ) nécessaire à la passivation des armatures. Cette carbonatation intervient quand le béton est de médiocre qualité ou que le milieu ambiant soit plus agressif et plus chargé en dioxyde de carbone. Il peut aussi se produire par alcali réaction entre l'eau des précipitations ou vapeur d'eau et des agrégats alcalins malencontreusement présents dans les composants du béton à l'origine. 2. Le deuxième phénomène est le défaut de passivation des armatures. Celles-ci se corrodent et gonflent par effet de corrosion. Le gonflement produit par cette corrosion produit des éclats en surface adjacente du béton. Ce qui reconduit la carbonatation un peu plus en profondeur et ainsi de suite, les deux phénomènes s'entretiennent pour nuire totalement à la structure en béton armé. La corrosion des armatures peut être initialement produite par défaut d'épaisseur d'enrobage, ou mauvaise qualité du béton en surface. La microfissuration du béton en surface nuit gravement à la passivation. Des solutions applicables existent, mais s'avèrent incomplètes. Elles se limitent à une passivation chimique instantanée des aciers découverts par application d'un produit approprié, alliée à un enduit en surface par produit approprié, mais sans apporter de 25 modification en profondeur du PH du béton, ou de l'enduit. De plus le retrait différentiel des produits appliqués par rapport à la surface du béton conservé, crée un accès direct au plan de reprise aux vapeurs d'eau et au dioxyde de carbone. De ce fait ces procédés ne permettent qu'un retardement plus au moins efficace de la 30 dégradation constatée. Certains produits performants peuvent bien apporter une - 2 - garantie décennale de la stabilité de la réparation qui restera non pérenne et demandera un entretien périodique. Notre invention présente un procédé qui apportera à la fois la stabilité et la pérennité de la réparation des éclats, et de la passivation des armatures structurelles. - 1 - DESCRIPTION The subject of the present research corresponds to a technique of repair of reinforced concrete structures, presenting disorders in the form of splinters on the surface of the concrete and corrosion of reinforcement, usually accompanied by cracks more or less important. The seriousness of these degradations lies in the alternation of two phenomena, weakening the structure, and which are mutually mutual: 1. the first phenomenon is the carbonation of concrete which results in a loss of the basic value of the PH (about 12 ) necessary for the passivation of the frames. This carbonation occurs when the concrete is of poor quality or that the environment is more aggressive and more loaded with carbon dioxide. It can also occur by alkali reaction between water precipitation or water vapor and alkaline aggregates inadvertently present in the components of the concrete originally. 2. The second phenomenon is the lack of passivation of reinforcement. These corrode and swell due to corrosion. The swelling produced by this corrosion produces splinters on the adjacent surface of the concrete. This renews the carbonation a little deeper and so on, the two phenomena are maintained to completely damage the reinforced concrete structure. The corrosion of the reinforcements may initially be produced by lack of coating thickness, or poor quality of the concrete surface. The microcracking of concrete on the surface seriously affects passivation. Applicable solutions exist but are incomplete. They are limited to an instant chemical passivation of the steel discovered by application of a suitable product, combined with a surface coating by appropriate product, but without making any change in depth of the PH of the concrete, or the coating. In addition, the differential shrinkage of the applied products relative to the surface of the conserved concrete, creates a direct access to the recovery plan for water vapor and carbon dioxide. As a result, these methods allow only a more or less effective delay in the degradation observed. Certain high-performance products can provide a ten-year guarantee of the stability of the repair, which will remain unsustainable and will require periodic maintenance. Our invention presents a method that will bring both the stability and durability of splinter repair, and the passivation of structural reinforcement.
Le procédé consiste en : 1. Le repérage des éclats et mesure de la profondeur maxi de carbonatation 2. Le décapage en surface du béton sur toute l'épaisseur atteinte 3. Perçages du support ainsi décapé pour les broches d'accrochage 4. Scellement des broches de reprise du bétonnage, dans le béton du support 5. Coffrage une face 6. Coulage de béton fin très haute performance, armé de fibre organique et stabilisé au retrait. 7. décoffrage. Il s'agit donc d'un ré-enrobage béton stabilisé. The method consists of: 1. The identification of splinters and measurement of the maximum depth of carbonation 2. The surface stripping of the concrete over the entire thickness achieved 3. Holes of the support thus stripped for the fastening pins 4. Sealing of the Concrete recovery pins, in the concrete of the support 5. One-side formwork 6. Pouring of very high performance fine concrete, reinforced with organic fiber and stabilized at the withdrawal. 7. stripping. It is therefore a stabilized concrete re-coating.
Le procédé trouve son originalité, également dans l'utilisation de béton stable au retrait et à la microfissuration. Les armatures en fibres organiques le rendent également stable aux attaques de corrosion en surface. Le non retrait, la finesse, et la qualité du béton, permettent de reconstituer un réel enrobage, tout en utilisant une faible épaisseur de produit. Ceci permet de conserver les dimensions architecturales de l'ouvrage. The process finds its originality, also in the use of stable concrete shrinkage and microcracking. The organic fiber reinforcements also make it stable to surface corrosion attacks. The non-shrinkage, the fineness, and the quality of the concrete make it possible to reconstitute a real coating, while using a small thickness of product. This preserves the architectural dimensions of the structure.
Le brochage désigné au point N°4 ci-dessus, permet également la stabilité et l'adhérence sans faille de la plaque de béton rajouté. Le retrait nul du béton rajouté, pallie le risque de vide infiltrant au niveau du plan franc de reprise de bétonnage qui rendrait la solution totalement inefficace. Enfin, l'utilisation d'un matériau béton pour cet enrobage apporte le PH basique 25 nécessaire à la passivation pérenne des armatures découvertes. The pinning designated in point No. 4 above, also allows the stability and seamless adhesion of the added concrete plate. The zero withdrawal of added concrete, mitigates the risk of infiltrating vacuum at the level of concrete recovery plan that would make the solution completely ineffective. Finally, the use of a concrete material for this coating provides the basic pH necessary for the perennial passivation of the exposed reinforcements.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1201438A FR2990942A1 (en) | 2012-05-22 | 2012-05-22 | Repairing perennial burst concrete having steel corrosion and carbonation, comprises re-coating a high performance stabilized concrete, where high performance concrete is reinforced and stabilized by organic fibers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1201438A FR2990942A1 (en) | 2012-05-22 | 2012-05-22 | Repairing perennial burst concrete having steel corrosion and carbonation, comprises re-coating a high performance stabilized concrete, where high performance concrete is reinforced and stabilized by organic fibers |
Publications (1)
Publication Number | Publication Date |
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FR2990942A1 true FR2990942A1 (en) | 2013-11-29 |
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FR1201438A Withdrawn FR2990942A1 (en) | 2012-05-22 | 2012-05-22 | Repairing perennial burst concrete having steel corrosion and carbonation, comprises re-coating a high performance stabilized concrete, where high performance concrete is reinforced and stabilized by organic fibers |
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FR (1) | FR2990942A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002121899A (en) * | 2000-10-18 | 2002-04-26 | Ohbayashi Corp | Repairing method for concrete structure |
JP2005104826A (en) * | 2003-09-08 | 2005-04-21 | Denki Kagaku Kogyo Kk | Spray material and repairing process using the same |
JP2008106570A (en) * | 2006-10-27 | 2008-05-08 | Sumitomo Kinzoku Kozan Siporex Kk | Reinforcing method of degraded autoclaved lightweight concrete panel horizontal member and autoclaved lightweight concrete panel horizontal member reinforced by the same |
-
2012
- 2012-05-22 FR FR1201438A patent/FR2990942A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002121899A (en) * | 2000-10-18 | 2002-04-26 | Ohbayashi Corp | Repairing method for concrete structure |
JP2005104826A (en) * | 2003-09-08 | 2005-04-21 | Denki Kagaku Kogyo Kk | Spray material and repairing process using the same |
JP2008106570A (en) * | 2006-10-27 | 2008-05-08 | Sumitomo Kinzoku Kozan Siporex Kk | Reinforcing method of degraded autoclaved lightweight concrete panel horizontal member and autoclaved lightweight concrete panel horizontal member reinforced by the same |
Non-Patent Citations (2)
Title |
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"Fiche technique : B 525, Mortier thixotropique renforcé par fibres et à retrait contrôlé pour la réparation du béton", 1 May 2012 (2012-05-01), Spresiano, Italy, XP055046752, Retrieved from the Internet <URL:http://www.fassabortolo.com/ledetail/produits/638-b525/base-1/b-525.html> [retrieved on 20121205] * |
"Steel-Reinforced Concrete Structures Assessment and Repair of Corrosion", 1 October 2007, Taylor and Francis Group, LLC., UK, ISBN: 978-1-42-005431-6, article MOHAMED A. EL-REEDY: "Chapter 8. Repair of Reinforced Concrete Structures", pages: 149 - 173, XP055046788, DOI: 10.1201/9781420054316.ch8 * |
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