EP0733757A1 - Method for protecting concrete-embedded reinforcing elements against oxidation effects - Google Patents
Method for protecting concrete-embedded reinforcing elements against oxidation effects Download PDFInfo
- Publication number
- EP0733757A1 EP0733757A1 EP95870020A EP95870020A EP0733757A1 EP 0733757 A1 EP0733757 A1 EP 0733757A1 EP 95870020 A EP95870020 A EP 95870020A EP 95870020 A EP95870020 A EP 95870020A EP 0733757 A1 EP0733757 A1 EP 0733757A1
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- Prior art keywords
- sheath
- solution
- reinforcement
- protected
- injection
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- 238000000034 method Methods 0.000 title claims description 21
- 230000000694 effects Effects 0.000 title claims description 14
- 230000003647 oxidation Effects 0.000 title claims description 6
- 238000007254 oxidation reaction Methods 0.000 title claims description 6
- 230000003014 reinforcing effect Effects 0.000 title 1
- 230000002787 reinforcement Effects 0.000 claims abstract description 34
- 239000000243 solution Substances 0.000 claims abstract description 26
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 25
- 230000007797 corrosion Effects 0.000 claims abstract description 19
- 238000005260 corrosion Methods 0.000 claims abstract description 19
- 239000004567 concrete Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 15
- 239000007924 injection Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 10
- 239000011440 grout Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims 1
- 230000035515 penetration Effects 0.000 abstract description 3
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 239000004570 mortar (masonry) Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 230000007170 pathology Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
-
- 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
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
- E04G23/0211—Arrangements for filling cracks or cavities in building constructions using injection
Definitions
- the invention relates to a method of protection against the effects of oxidation on active reinforcements embedded in a mass of concrete, said reinforcements being able to be in the form of a set of wires or strands arranged in a sheath, and also to put at the same time highlight the imperfections of the injection grout (voids, porosities).
- prestressed and / or post-stressed concrete is meant a technology enabling beams, slabs or any concrete element to be given sufficient own strength to enable them to fulfill the function assigned to them.
- Active reinforcements are high-strength steels which are particularly sensitive to degradation by the effect of corrosion due to the action of oxygen. Protection against corrosion of these reinforcements is conventionally achieved by coating them with a mortar, or with a cement grout. In the latter case, the active reinforcements are enveloped by a continuous sheath, most often made of steel strips but also of PVC or, more recently, of high density polyethylene. This sheath constitutes the conduit which allows the injection of the protective cement grout. The protection of active prestressing reinforcement by adhesion is that conferred by structural concrete.
- this protection against corrosion should be sufficient since it acts as a barrier to the penetration of oxygen from the air, it provides water tightness and, moreover, it gives the medium a pH basic preventing the development of corrosion.
- the pathology described concerns road bridges as well as any type of pre-stressed or post-stressed construction.
- the object of the invention is therefore to propose a new and original process capable of remedying the effects of oxidation on active reinforcements, this term being taken in its broadest sense.
- the invention therefore consists in penetrating in all cases, even with perfectly injected sets of cement, the corrosion inhibiting solution on all of the metallic elements present.
- a channel is first drilled in the mass of concrete opening out facing the reinforcement which must be protected and in that a corrosion inhibiting solution is then injected into said channel. to which is applied a pulsating wave of high power intended to make it penetrate.
- the aforementioned channel is drilled, through said sheath so that the corrosion inhibiting solution can come into contact with the reinforcement , or the set of wires or strands to be protected and that afterwards a cement grout is injected in order to fill the pores and voids of the sheath injection grout.
- At least one second channel is drilled opening out facing the armature to be protected in order to control the path of the inhibiting solution along said armature respectively inside the aforementioned sheath.
- a remarkable characteristic of the invention resides in the fact that the inhibiting solution is introduced under pressure by making use of a high frequency reciprocating pump capable of producing a pulsed effect on the inhibiting solution.
- Figure 1 is a schematic view of an installation illustrating the method according to the invention.
- Figures 2 and 3 show on a larger scale a detail of the installation according to Figure 1, adapted to the protection of a sheathed frame.
- the reference 1 designates a prestressed concrete beam.
- the reinforcements 2 to be protected against the effects of oxidation can be placed in a sheath which has not been explicitly reproduced in FIG. 1.
- this sheath is visible and is designated by the reference 3, and a cement grout coats the reinforcements 2.
- a channel 4 is drilled in the mass of concrete up to the immediate vicinity of the reinforcements 2 and when a sheath is present. This drilling is also done through this sheath.
- a high frequency alternating pulsating pump suitable for the application of the method according to the invention is shown schematically in the various figures by the reference 5.
- Such a pump is developed so that a sealed enclosure is formed allowing to put in alternative compression the corrosion inhibiting solution.
- the device known under the name of "sonotrode” makes it possible to put the inhibiting solution in overpressure and in depression and this at a sufficiently high frequency so that a pulsating effect of the liquid is obtained.
- This pulsating effect of the liquid promotes its penetration into the interstices and microcracks present in the concrete near the reinforcements to be protected.
- the ultrasonic transmitter has an injection tube 6 equipped externally with means which make it possible to achieve absolute sealing with respect to the channel 4 through which the liquid is injected.
- the compression chamber is given the reference 7.
- the inhibiting solution enters the ultrasonic emitter through line 8, while the coolant of the compression enclosure reaches the emitter through line 9.
- the cooling solution of the compression chamber leaves the ultrasonic emitter through line 10 and the corrosion inhibiting liquid through line 11 to the overflow tank 12.
- the circulation of a coolant is necessary in order to avoid overheating and possible degradation of the corrosion inhibiting liquid.
- Ultrasound created by the high power ultrasonic transmitter which is used in the context of the method according to the invention has an additional effect.
- the ultrasonic waves generated by the ultrasonic transmitter are powerful enough to create a cavitation effect in the liquid. This cavitation effect makes it possible to clear the entrances leading to the interstices and microcracks present in the concrete.
- the ultrasonic acoustic waves cause vibration inside these interstices and these microcracks and by the same allow the opening and closing of these at the frequency of the acoustic wave. This phenomenon promotes the advancement of the liquid in these interstices and microcracks.
- the channels 4 ′ make it possible to control the path of the inhibiting solution along the reinforcements 2, respectively inside the sheath 3.
- the method therefore makes it possible to evaluate the porosity of the mass 13 of the existing injection mortar. If it can be concluded that the said grout is either non-existent or very porous, it is possible, after injection of the inhibiting solution, to inject via the conduits (4), and this by conventional means or by the process which has just be described, a cement-based micro-mortar.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Bridges Or Land Bridges (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Reinforcement Elements For Buildings (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
L'invention concerne un procédé de protection contre les effets de l'oxydation sur des armatures actives noyées dans une masse de béton, lesdites armatures pouvant se présenter sous forme d'ensemble de fils ou de torons disposés dans une gaine, et de mettre également en même temps en évidence les imperfections du coulis d'injection (vides, porosités).The invention relates to a method of protection against the effects of oxidation on active reinforcements embedded in a mass of concrete, said reinforcements being able to be in the form of a set of wires or strands arranged in a sheath, and also to put at the same time highlight the imperfections of the injection grout (voids, porosities).
Quoique l'invention s'applique à la protection de tout type d'armature dans une masse de béton, l'invention sera décrite plus particulièrement dans le cadre de la protection contre les effets de l'oxydation d'armatures ou l'ensemble d'armatures telles que celles-ci se rencontrent dans les ouvrages de génie civil édifiés selon les techniques dites de précontrainte ou de postcontrainte.Although the invention applies to the protection of any type of reinforcement in a concrete mass, the invention will be described more particularly in the context of protection against the effects of the oxidation of reinforcements or the assembly of reinforcements such as these are found in civil engineering works built using so-called prestressing or post-stressing techniques.
On désigne par béton précontraint et/ou postcontraint une technologie permettant de conférer à des poutres, dalles ou tout élément en béton une résistance propre suffisante pour leur permettre de remplir la fonction qui leur est assignée.By prestressed and / or post-stressed concrete is meant a technology enabling beams, slabs or any concrete element to be given sufficient own strength to enable them to fulfill the function assigned to them.
Cette résistance propre est réalisée par la mise en tension soit de fils, de barres d'acier ou de torons, à très haute limite de résistance, appelés en toute généralité armatures actives. L'effort de traction exercé pour tendre ces armatures est transféré au béton qui, par réaction, subit un effet de compression. Les efforts normaux et les moments de flexion ainsi créés équilibrent les actions des charges extérieures, réalisant de cette manière la résistance demandée.This inherent resistance is achieved by tensioning either wires, steel bars or strands, with very high resistance limits, generally called active reinforcements. The tensile force exerted to tension these reinforcements is transferred to the concrete which, by reaction, undergoes a compression effect. Normal efforts and moments of bending thus created balance the actions of the external loads, thus achieving the required resistance.
Les armatures actives sont des aciers à haute résistance particulièrement sensibles aux dégradations par effet de corrosion due à l'action de l'oxygène. La protection contre la corrosion de ces armatures est classiquement réalisée en les enrobant par un mortier, ou par un coulis de ciment. Dans ce dernier cas, les armatures actives sont enveloppées par une gaine continue, le plus souvent constituée de feuillards d'acier mais aussi en PVC ou, plus récemment, en polyéthylène à haute densité. Cette gaine constitue le conduit qui permet l'injection du coulis protecteur de ciment. La protection des armatures actives de précontrainte par adhérence, est celle conférée par le béton de structure.Active reinforcements are high-strength steels which are particularly sensitive to degradation by the effect of corrosion due to the action of oxygen. Protection against corrosion of these reinforcements is conventionally achieved by coating them with a mortar, or with a cement grout. In the latter case, the active reinforcements are enveloped by a continuous sheath, most often made of steel strips but also of PVC or, more recently, of high density polyethylene. This sheath constitutes the conduit which allows the injection of the protective cement grout. The protection of active prestressing reinforcement by adhesion is that conferred by structural concrete.
En principe cette protection vis-à-vis de la corrosion devrait être suffisante car elle fait barrière à la pénétration de l'oxygène de l'air, elle assure une étanchéité à l'eau et, de plus, elle confère au milieu un pH basique empêchant le développement de la corrosion.In principle, this protection against corrosion should be sufficient since it acts as a barrier to the penetration of oxygen from the air, it provides water tightness and, moreover, it gives the medium a pH basic preventing the development of corrosion.
De nombreux facteurs parmi lesquels les imperfections d'injection ou, tout simplement, l'inéluctable phénomène physique du retrait des mortiers ou des coulis de ciment sont responsables d'une protection insuffisante ou imparfaite. Même lorsque la protection est assurée à un pourcentage élevé, le faible pourcentage d'imperfection est largement suffisant pour provoquer les altérations par oxygénation des armatures actives.Many factors, including injection imperfections or, quite simply, the inevitable physical phenomenon of the removal of mortars or cement grouts, are responsible for insufficient or imperfect protection. Even when protection is provided at a high percentage, the low percentage of imperfection is more than sufficient to cause oxygenation alterations in the active reinforcements.
Ces défauts de protection, même localisés et à l'abri d'un renouvellement d'air, posent tôt ou tard des problèmes de corrosion.These protection faults, even localized and protected from air renewal, sooner or later pose corrosion problems.
La lutte contre le verglas et la neige se faisant plus souvent par épandage, parfois en quantité très importantes, de chlorure de calcium ou de chlorure de sodium, avec contamination par le chlore peut atteindre les armatures actives, à la faveur d'un défaut du milieu d'enrobage. Les conditions physico-chimiques favorables à la corrosion peuvent facilement devenir telles que des corrosions se développent avec, dans le cas extrême, rupture d'armatures.The fight against ice and snow being done more often by spreading, sometimes in very large quantities, of calcium chloride or sodium chloride, with contamination by chlorine can reach the active reinforcements, thanks to a defect of the coating medium. The physico-chemical conditions favorable to corrosion can easily become such that corrosions develop with, in the extreme case, failure of reinforcements.
La pathologie décrite concerne tout aussi bien les ponts routiers que tout type de construction précontrainte ou postcontrainte.The pathology described concerns road bridges as well as any type of pre-stressed or post-stressed construction.
Une autre source de corrosion des aciers actifs est constituée par la perte du caractère fortement basique du milieu environnant les aciers (mortier, coulis de ciment, béton) du fait de la carbonatation de ce milieu.Another source of corrosion of active steels is the loss of the highly basic character of the environment surrounding the steels (mortar, cement grout, concrete) due to the carbonation of this environment.
L'invention a donc pour objet de proposer un procédé nouveau et original, capable de remédier aux effets d'oxydation sur les armatures actives, ce terme étant pris dans son sens le plus large.The object of the invention is therefore to propose a new and original process capable of remedying the effects of oxidation on active reinforcements, this term being taken in its broadest sense.
L'invention consiste donc à faire pénétrer dans tous les cas de figure, même avec des ensembles parfaitement injectés de ciment, la solution inhibitrice de corrosion sur l'intégralité des éléments métalliques présents.The invention therefore consists in penetrating in all cases, even with perfectly injected sets of cement, the corrosion inhibiting solution on all of the metallic elements present.
Pour réaliser cet objectif conformément à l'invention on fore, dans un premier temps, dans la masse de béton un canal débouchant face à l'armature qui doit être protégée et en ce qu'on injecte ensuite dans ledit canal une solution inhibitrice de corrosion à laquelle est appliqué une onde pulsatoire de haute puissance destiné à la faire pénétrer.To achieve this objective in accordance with the invention, a channel is first drilled in the mass of concrete opening out facing the reinforcement which must be protected and in that a corrosion inhibiting solution is then injected into said channel. to which is applied a pulsating wave of high power intended to make it penetrate.
Dans une forme de réalisation particulière et lorsque l'armature active est entourée d'une gaine telle qu'utilisée en pré- ou postcontrainte on fore le canal précité, au travers de ladite gaine de telle sorte que la solution inhibitrice de corrosion puisse entrer en contact avec l'armature, ou l'ensemble de fils ou de torons à protéger et que par après on injecte un coulis de ciment afin de remplir les pores et les vides du coulis d'injection des gaines.In one embodiment particular and when the active reinforcement is surrounded by a sheath as used in pre- or post-stressing, the aforementioned channel is drilled, through said sheath so that the corrosion inhibiting solution can come into contact with the reinforcement , or the set of wires or strands to be protected and that afterwards a cement grout is injected in order to fill the pores and voids of the sheath injection grout.
Toujours selon l'invention on fore au moins un second canal débouchant face à l'armature à protéger afin de contrôler le cheminement de la solution inhibitrice le long de ladite armature respectivement à l'intérieur de la gaine précitée.Still according to the invention, at least one second channel is drilled opening out facing the armature to be protected in order to control the path of the inhibiting solution along said armature respectively inside the aforementioned sheath.
Une caractéristique remarquable de l'invention réside dans le fait que la solution inhibitrice est introduite sous pression en faisant usage d'une pompe alternative de fréquence élevée capable de produire un effet pulsé sur la solution inhibitrice.A remarkable characteristic of the invention resides in the fact that the inhibiting solution is introduced under pressure by making use of a high frequency reciprocating pump capable of producing a pulsed effect on the inhibiting solution.
D'autres détails et avantages de l'invention ressortiront de la description qui sera donnée ci-après. Cette description n'est donnée qu'à titre d'exemple et ne limite pas l'invention. Les notations de référence se rapportent aux figures ci-jointes.Other details and advantages of the invention will emerge from the description which will be given below. This description is given by way of example only and does not limit the invention. The reference notations refer to the attached figures.
La figure 1 est une vue schématique d'une installation illustrant le procédé selon l'invention.Figure 1 is a schematic view of an installation illustrating the method according to the invention.
Les figures 2 et 3 montrent à une plus grande échelle un détail de l'installation selon la figure 1, adaptée à la protection d'une armature gainée.Figures 2 and 3 show on a larger scale a detail of the installation according to Figure 1, adapted to the protection of a sheathed frame.
Le procédé illustré par ces figures est caractérisé par plusieurs étapes qui seront décrites ci-après.The process illustrated by these figures is characterized by several steps which will be described below.
Aux figures la référence 1 désigne une poutre en béton précontraint. Les armatures 2 à protéger contre les effets de l'oxydation peuvent être disposées dans une gaine qui n'a pas explicitement été reproduite à la figure 1. Aux figures 2 et 3 cette gaine est visible et est désignée par la référence 3, et un coulis de ciment enrobe les armatures 2.In the figures, the
Dans une première phase on fore dans la masse de béton un canal 4 jusqu'à proximité immédiate des armatures 2 et lorsqu'une gaine est présente. Ce forage se fait également au travers de cette gaine.In a first phase, a
Dans le canal 4 ainsi foré on injecte une solution inhibitrice de corrosion à laquelle est appliqué un champ pulsatoire de haute puissance.In the
Ceci peut se faire en faisant usage d'un émetteur ultrasonore de haute puissance tel qu'une pompe pulsatoire alternative.This can be done by making use of a high power ultrasonic transmitter such as an alternative pulse pump.
Un émetteur ultrasonore convenant particulièrement à l'application du procédé selon l'invention est connu sous le nom de "sonotrode" construit et commercialisé par la société S C P BISCORNET.An ultrasonic transmitter which is particularly suitable for the application of the method according to the invention is known under the name of "sonotrode" built and marketed by the company S C P BISCORNET.
Une pompe pulsatoire alternative de fréquence élevée convenant à l'application du procédé selon l'invention est représentée schématiquement aux diverses figures par la référence 5. Une telle pompe est développée de manière qu'il se forme une enceinte étanche permettant de mettre en compression alternative la solution inhibitrice de corrosion. Le dispositif connu sous le nom de "sonotrode" permet de mettre la solution inhibitrice en surpression et en dépression et cela à une fréquence suffisamment élevée pour que soit obtenu un effet pulsatoire du liquide. Cet effet pulsatoire du liquide favorise sa pénétration dans les interstices et les microfissures présentes dans le béton à proximité des armatures à protéger. L'émetteur ultrasonore présente un tube d'injection 6 équipé extérieurement de moyens qui permettent de réaliser l'étanchéité absolue par rapport au canal 4 par lequel le liquide est injecté. L'enceinte de compression porte à la figure 2 la référence 7. La solution inhibitrice pénètre dans l'émetteur ultrasonore par la conduite 8, tandis que le liquide de refroidissement de l'enceinte de compression atteint l'émetteur par la conduite 9. La solution de refroidissement de l'enceinte de compression quitte l'émetteur ultrasonore par la conduite 10 et le liquide inhibiteur de corrosion par la conduite 11 vers le réservoir de trop-plein 12. La circulation d'un liquide de refroidissement est nécessaire afin d'éviter un échauffement et une éventuelle dégradation du liquide inhibiteur de corrosion.A high frequency alternating pulsating pump suitable for the application of the method according to the invention is shown schematically in the various figures by the
Des ultrasons créés par l'émetteur d'ultrasonore de haute puissance dont il est fait usage dans le cadre du procédé selon l'invention ont un effet supplémentaire. En effet, les ondes ultrasonores générées par l'émetteur ultrasonore sont suffisamment puissantes pour créer un effet de cavitation dans le liquide. Cet effet de cavitation permet de dégager les entrées menant aux interstices et aux microfissures présentes dans le béton. De plus, les ondes acoustiques ultrasonores provoquent une vibration à l'intérieur de ces interstices et ces microfissures et par la même permettent l'ouverture et la fermeture de celles-ci à la fréquence de l'onde acoustique. Ce phénomène favorise l'avancement du liquide dans ces interstices et microfissures.Ultrasound created by the high power ultrasonic transmitter which is used in the context of the method according to the invention has an additional effect. Indeed, the ultrasonic waves generated by the ultrasonic transmitter are powerful enough to create a cavitation effect in the liquid. This cavitation effect makes it possible to clear the entrances leading to the interstices and microcracks present in the concrete. In addition, the ultrasonic acoustic waves cause vibration inside these interstices and these microcracks and by the same allow the opening and closing of these at the frequency of the acoustic wave. This phenomenon promotes the advancement of the liquid in these interstices and microcracks.
Dans le cadre du procédé selon l'invention, tel que celui-ci est illustré par la figure 1, on remarque qu'en dehors des canaux 4 destinés à l'injection du liquide inhibiteur de corrosion on a également prévu une série de canaux secondaires 4'. Ces canaux traversent également la gaine à l'intérieur de laquelle sont disposées les armatures.In the context of the method according to the invention, as shown in FIG. 1, it is noted that outside the
Les canaux 4' permettent de contrôler le cheminement de la solution inhibitrice le long des armatures 2, respectivement à l'intérieur de la gaine 3.The
Grâce à cette disposition il est possible de contrôler continuellement le bon fonctionnement du procédé en observant le cheminement de la solution inhibitrice à l'intérieur du béton.Thanks to this arrangement, it is possible to continuously monitor the proper functioning of the process by observing the path of the inhibiting solution inside the concrete.
Le procédé permet donc d'évaluer la porosité de la masse 13 du mortier d'injection existant. Dans le cas où on peut conclure que ledit coulis est soit inexistant, soit très poreux, on peut, après injection de la solution inhibitrice, injecter par les conduits (4), et cela par des moyens classiques ou par le procédé qui vient d'être décrit, un micro-mortier à base de ciment.The method therefore makes it possible to evaluate the porosity of the
L'invention n'est évidemment pas limitée à la forme d'exécution décrite ci-dessus et bien des modifications pourraient y être apportées pour autant que celles-ci tombent dans le cadre des revendications ci-jointes.The invention is obviously not limited to the embodiment described above and many modifications could be made to it provided that these fall within the scope of the appended claims.
Claims (8)
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT95870020T ATE202613T1 (en) | 1995-03-06 | 1995-03-06 | METHOD FOR PROTECTING AGAINST OXYDATION EFFECTS OF PROBATION ELEMENTS EMBEDDED IN CONCRETE |
DE69521492T DE69521492T2 (en) | 1995-03-06 | 1995-03-06 | Process for protecting against oxidation effects of concrete elements embedded in concrete |
PT95870020T PT733757E (en) | 1995-03-06 | 1995-03-06 | PROTECTION PROCEDURE AGAINST THE EFFECTS OF THE OXIDATION OF THE EMBEDDED ARMORS IN A BETA |
EP95870020A EP0733757B1 (en) | 1995-03-06 | 1995-03-06 | Method for protecting concrete-embedded reinforcing elements against oxidation effects |
ES95870020T ES2158065T3 (en) | 1995-03-06 | 1995-03-06 | PROCEDURE FOR PROTECTION AGAINST THE EFFECTS OF OXIDATION ON AN ACTIVE ARMORS EMBEDDED IN A CONCRETE MASS. |
DK95870020T DK0733757T3 (en) | 1995-03-06 | 1995-03-06 | Method of protecting against oxidation effects on active reinforcement embedded in concrete |
US08/709,678 US5840247A (en) | 1995-03-06 | 1996-09-09 | Process for the protection of active reinforcements embedded in a concrete mass |
GR20010401316T GR3036465T3 (en) | 1995-03-06 | 2001-08-30 | Method for protecting concrete-embedded reinforcing elements against oxidation effects |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95870020A EP0733757B1 (en) | 1995-03-06 | 1995-03-06 | Method for protecting concrete-embedded reinforcing elements against oxidation effects |
US08/709,678 US5840247A (en) | 1995-03-06 | 1996-09-09 | Process for the protection of active reinforcements embedded in a concrete mass |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0733757A1 true EP0733757A1 (en) | 1996-09-25 |
EP0733757B1 EP0733757B1 (en) | 2001-06-27 |
Family
ID=26140792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95870020A Expired - Lifetime EP0733757B1 (en) | 1995-03-06 | 1995-03-06 | Method for protecting concrete-embedded reinforcing elements against oxidation effects |
Country Status (8)
Country | Link |
---|---|
US (1) | US5840247A (en) |
EP (1) | EP0733757B1 (en) |
AT (1) | ATE202613T1 (en) |
DE (1) | DE69521492T2 (en) |
DK (1) | DK0733757T3 (en) |
ES (1) | ES2158065T3 (en) |
GR (1) | GR3036465T3 (en) |
PT (1) | PT733757E (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011091862A1 (en) | 2010-02-01 | 2011-08-04 | Pmd-Ateav Systems Sprl | Method and system for injecting liquid in a porous material |
EP2885452A4 (en) * | 2012-08-14 | 2016-05-11 | David W Whitmore | Corrosion protection of cables in a concrete structure |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6170209B1 (en) * | 1996-11-05 | 2001-01-09 | University Of Maine | Prestressing system for wood structures and elements |
FR2818274B1 (en) * | 2000-12-18 | 2003-02-14 | Alto Btp | PROCESS FOR THE PROTECTION, REPAIR AND CONSOLIDATION OF WORKS OF ARTS COMPRISING METAL ELEMENTS INCLUDED IN A CONCRETE, PLASTER, CEMENT OR MORTAR MATRIX |
US6960320B1 (en) * | 2004-04-15 | 2005-11-01 | Lamplight Farms, Inc. | Oil burning lamps and related systems |
US8800224B1 (en) | 2006-11-14 | 2014-08-12 | Cortec Corporation | Corrosion inhibiting vapor for use in connection with encased articles |
US7892601B1 (en) | 2006-11-14 | 2011-02-22 | Cortec Corporation | Corrosion inhibiting powders and processes employing powders |
US8603603B2 (en) | 2011-02-07 | 2013-12-10 | Cortec Corporation | Corrosion inhibiting systems |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2346879A (en) * | 1941-09-30 | 1944-04-18 | Louis S Wertz | Apparatus for filling cracks in concrete masonry structures |
FR2116618A5 (en) * | 1970-12-01 | 1972-07-21 | Conin Gilbert | Repairing cracked concrete beams - by injecting epoxy resin |
GB1480718A (en) * | 1975-12-02 | 1977-07-20 | Balfour Beatty Ltd | Artificial and natural structures |
EP0300956A1 (en) * | 1987-07-24 | 1989-01-25 | HILTI Aktiengesellschaft | Method of strengtening cracked building structures |
WO1992020902A1 (en) * | 1991-05-22 | 1992-11-26 | Ingvar Bogdanoff | A rock or concrete injection method and a device for performing the method |
-
1995
- 1995-03-06 ES ES95870020T patent/ES2158065T3/en not_active Expired - Lifetime
- 1995-03-06 DK DK95870020T patent/DK0733757T3/en active
- 1995-03-06 PT PT95870020T patent/PT733757E/en unknown
- 1995-03-06 AT AT95870020T patent/ATE202613T1/en active
- 1995-03-06 EP EP95870020A patent/EP0733757B1/en not_active Expired - Lifetime
- 1995-03-06 DE DE69521492T patent/DE69521492T2/en not_active Expired - Lifetime
-
1996
- 1996-09-09 US US08/709,678 patent/US5840247A/en not_active Expired - Lifetime
-
2001
- 2001-08-30 GR GR20010401316T patent/GR3036465T3/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2346879A (en) * | 1941-09-30 | 1944-04-18 | Louis S Wertz | Apparatus for filling cracks in concrete masonry structures |
FR2116618A5 (en) * | 1970-12-01 | 1972-07-21 | Conin Gilbert | Repairing cracked concrete beams - by injecting epoxy resin |
GB1480718A (en) * | 1975-12-02 | 1977-07-20 | Balfour Beatty Ltd | Artificial and natural structures |
EP0300956A1 (en) * | 1987-07-24 | 1989-01-25 | HILTI Aktiengesellschaft | Method of strengtening cracked building structures |
WO1992020902A1 (en) * | 1991-05-22 | 1992-11-26 | Ingvar Bogdanoff | A rock or concrete injection method and a device for performing the method |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011091862A1 (en) | 2010-02-01 | 2011-08-04 | Pmd-Ateav Systems Sprl | Method and system for injecting liquid in a porous material |
RU2524582C2 (en) * | 2010-02-01 | 2014-07-27 | ПМД-АТЕАВ Системс СПРЛ | Method and system for fluid discharge into porous material |
US8911835B2 (en) | 2010-02-01 | 2014-12-16 | Pmd-Ateav Systems Sprl | Method and system for injecting liquid in a porous material |
EP2885452A4 (en) * | 2012-08-14 | 2016-05-11 | David W Whitmore | Corrosion protection of cables in a concrete structure |
Also Published As
Publication number | Publication date |
---|---|
DK0733757T3 (en) | 2001-10-29 |
PT733757E (en) | 2001-12-28 |
DE69521492T2 (en) | 2002-06-06 |
GR3036465T3 (en) | 2001-11-30 |
US5840247A (en) | 1998-11-24 |
ES2158065T3 (en) | 2001-09-01 |
EP0733757B1 (en) | 2001-06-27 |
DE69521492D1 (en) | 2001-08-02 |
ATE202613T1 (en) | 2001-07-15 |
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