EP0733757B1 - 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
- EP0733757B1 EP0733757B1 EP95870020A EP95870020A EP0733757B1 EP 0733757 B1 EP0733757 B1 EP 0733757B1 EP 95870020 A EP95870020 A EP 95870020A EP 95870020 A EP95870020 A EP 95870020A EP 0733757 B1 EP0733757 B1 EP 0733757B1
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- EP
- European Patent Office
- Prior art keywords
- sheath
- solution
- armouring
- channel
- high power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims description 22
- 230000000694 effects Effects 0.000 title claims description 10
- 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
- 239000000243 solution Substances 0.000 claims abstract description 23
- 230000007797 corrosion Effects 0.000 claims abstract description 22
- 238000005260 corrosion Methods 0.000 claims abstract description 22
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 17
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 238000002347 injection Methods 0.000 claims abstract description 16
- 239000007924 injection Substances 0.000 claims abstract description 16
- 238000005553 drilling Methods 0.000 claims description 2
- 238000002604 ultrasonography Methods 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 abstract description 26
- 239000004568 cement Substances 0.000 abstract description 13
- 230000035515 penetration Effects 0.000 abstract description 4
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 13
- 239000011440 grout Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 11
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 239000003112 inhibitor Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 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
- 239000011513 prestressed concrete Substances 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
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 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
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 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
- 239000011148 porous material Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 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 can be in the form set of wires or strands arranged in a sheath, and also highlight at the same time imperfections in the injection grout (voids, porosities).
- the invention applies to the protection of any type of reinforcement in a mass of concrete, the invention will be described more particularly as part of protection against the effects of the oxidation of reinforcements or the set of reinforcements as these are found in works of civil engineering built according to the so-called techniques of prestressing or post-stressing.
- Prestressed concrete and / or post-constrained a technology allowing to confer on beams, slabs or any other concrete element sufficient own resistance to allow them to fulfill the function assigned to them.
- This own resistance is achieved by tensioning either wires, steel bars or strands, with a very high resistance limit, generally called active reinforcements.
- the effort of tension exerted to tension these reinforcements is transferred to concrete which, by reaction, undergoes a compression. Normal efforts and moments of bending thus created balance the actions of the loads exterior, thereby achieving resistance requested.
- Active reinforcements are steels high resistance particularly sensitive to degradation by corrosion effect due to the action of oxygen.
- the corrosion protection of these reinforcements are conventionally produced by coating them by a mortar, or by a cement grout.
- the active reinforcements are surrounded by a continuous sheath, most often made up of steel strips but also PVC or, more recently, made of high density polyethylene. This sheath constitutes the conduit which allows the injection of the grout cement protector. Protection of reinforcements active prestressing by adhesion, is that imparted by structural concrete.
- this protection against corrosion should be sufficient as it causes barrier to the penetration of oxygen from the air, it provides watertightness and, in addition, provides in the middle a basic pH preventing the development of corrosion.
- the pathology described also concerns well the road bridges that any type of construction prestressing or post-stressing.
- Another source of steel corrosion assets is constituted by the loss of character strongly basic environment surrounding steels (mortar, grout cement, concrete) due to the carbonation of this medium.
- Document FR-A-2 116 618 proposes a process, capable of remedying the effects of oxidation on active reinforcements, this term being taken in its sense the wider.
- a mortar patching is injected to fill defects in porosity in structures such as cracks, crevices, etc.
- the injection is obtained using a pump alternating pressure fluctuation, obtained by the movement of a piston in a cylinder ("fluid hammering").
- the invention is as expressed in the claim 1 and therefore consists in using the process as described in document FR-A-2 116 618, but by applying to the corrosion inhibiting solution a high power and frequency pulsating wave such as the acoustic waves produced (ultrasound) in promote penetration.
- High frequency is associated with phenomenon nonexistent in the state of the art: waves high-power acoustics that are produced create in the liquid a state of cavitation which allows to release the entrances leading to microcracks and interstices.
- the acoustic waves produced in the liquid vibrate microcracks and interstices which open and close in phase at the frequency of the ultrasonic wave and thus allow the liquid to progress in the environment of cement grout protection.
- the present invention therefore allows to amplify the diffusion of the liquid concerned in the microcracks and interstices of the medium. These are extremely small (microscopic) compared to simple defects, such as cavities, cracks, voids, etc., from which they must be distinguished. In other words, the liquid is not only injected into the cavities which are medium faults but is also injected into the microcracks that are naturally present in the cement due to its removal when setting.
- the channel is drilled above, through said sheath so that the corrosion inhibiting solution may come into contact with the armature, or the set of wires or strands to protect and then inject a cement grout to fill the pores and voids of the grout sheath injection.
- At least one drill a second channel leading to the armature to be protected in order to control the flow of the inhibitor solution along said reinforcement respectively inside the aforementioned sheath.
- Figure 1 is a schematic view of a installation illustrating the process according to the invention.
- Figures 2 and 3 show one more large scale a detail of the installation according to the figure 1, suitable for the protection of a sheathed frame.
- reference 1 designates a prestressed concrete beam.
- Reinforcement 2 to protect against the effects of oxidation can be arranged in a sheath that has not been explicitly reproduced at Figure 1.
- this sheath is visible and is designated by reference 3, and a cement grout coats the frames 2.
- a first phase we drill in the concrete mass channel 4 to the immediate vicinity of reinforcements 2 and when a sheath is present. This drilling is also made through this sheath.
- a suitable ultrasonic transmitter particularly to the application of the process according to the invention is known as the "sonotrode” built and marketed by S C P BISCORNET.
- An alternative pulse pump of high frequency suitable for the application of the process according to the invention is shown schematically in the various figures by reference 5.
- Such a pump is developed so that a sealed enclosure is formed allowing to put the solution in alternative compression corrosion inhibitor.
- the device known as of "sonotrode” allows to put the inhibitory solution in overpressure and depression and this at a frequency high enough for an effect to be obtained pulsating liquid.
- This pulsating effect of the liquid promotes its penetration into interstices and microcracks present in the concrete near the reinforcements to protect.
- the ultrasonic transmitter has a injection tube 6 externally equipped with means which allow to achieve absolute tightness compared to channel 4 through which the liquid is injected.
- the enclosure of compression bears reference 7 in FIG. 2.
- inhibitory solution enters the ultrasonic transmitter through line 8, while the coolant of the compression enclosure reaches the ultrasonic transmitter via line 10 and the corrosion inhibiting liquid via line 11 to the overflow tank 12.
- the coolant circulation is required in order to avoid overheating and possible degradation corrosion inhibiting liquid.
- outside channels 4 intended for the injection of the liquid inhibitor of corrosion we also planned a series of channels secondary 4 '. These channels also cross the sheath inside which are arranged the frames.
- 4 'channels allow control the path of the inhibitor solution along the reinforcements 2, respectively inside the sheath 3.
- the method therefore makes it possible to evaluate the porosity of mass 13 of the injection mortar existing.
- said grout is either non-existent or very porous, we can, after injection of the inhibitor solution, inject by the conduits (4), and this by conventional means or by the process which has just been described, a micro-mortar based on cement.
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- Architecture (AREA)
- Engineering & Computer Science (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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Bridges Or Land Bridges (AREA)
- Reinforcement Elements For Buildings (AREA)
- Fuel-Injection Apparatus (AREA)
- Preventing Corrosion Or Incrustation Of Metals (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 can be in the form set of wires or strands arranged in a sheath, and also highlight at the same time imperfections in 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 mass of concrete, the invention will be described more particularly as part of protection against the effects of the oxidation of reinforcements or the set of reinforcements as these are found in works of civil engineering built according to the so-called techniques of prestressing or post-stressing.
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.Prestressed concrete and / or post-constrained a technology allowing to confer on beams, slabs or any other concrete element sufficient own resistance to allow 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 own resistance is achieved by tensioning either wires, steel bars or strands, with a very high resistance limit, generally called active reinforcements. The effort of tension exerted to tension these reinforcements is transferred to concrete which, by reaction, undergoes a compression. Normal efforts and moments of bending thus created balance the actions of the loads exterior, thereby achieving resistance requested.
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 steels high resistance particularly sensitive to degradation by corrosion effect due to the action of oxygen. The corrosion protection of these reinforcements are conventionally produced by coating them by a mortar, or by a cement grout. In this last case, the active reinforcements are surrounded by a continuous sheath, most often made up of steel strips but also PVC or, more recently, made of high density polyethylene. This sheath constitutes the conduit which allows the injection of the grout cement protector. Protection of reinforcements active prestressing by adhesion, is that imparted 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 as it causes barrier to the penetration of oxygen from the air, it provides watertightness and, in addition, provides in the middle a basic pH 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 withdrawal of mortars or cement grouts are responsible insufficient or imperfect protection. same when protection is provided at a percentage high, the low percentage of imperfection is more than enough to cause damage by oxygenation of active armatures.
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 flaws, even located and protected from air renewal, pose sooner or later 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 is more often by spreading, sometimes in very large quantities important, calcium chloride or chloride sodium, with chlorine contamination can reach active reinforcements, thanks to a medium defect coating. The physico-chemical conditions favorable to corrosion can easily become such that corrosions develop with, in the extreme case, reinforcement failure.
La pathologie décrite concerne tout aussi bien les ponts routiers que tout type de construction précontrainte ou postcontrainte.The pathology described also concerns well the road bridges that any type of construction prestressing or post-stressing.
Une autre source de corrosion des aciers actifs est constituée par la perte de caractère fortement basique du milieu environnant les aciers (mortier, coulis de ciment, béton) du fait de la carbonatation de ce milieu.Another source of steel corrosion assets is constituted by the loss of character strongly basic environment surrounding steels (mortar, grout cement, concrete) due to the carbonation of this medium.
Le document FR-A-2 116 618 propose un procédé, capable de remédier aux effets d'oxydation sur les armatures actives, ce terme étant pris dans son sens le plus large. Dans un premier temps, on fore dans la masse de béton un canal débouchant face à l'armature qui doit être protégée. On injecte ensuite sous pression dans le canal un mortier et/ou une solution inhibitrice de corrosion jusqu'à resuage de celui-ci vers l'extérieur. L'injection est réalisée en utilisant une pompe pneumatique pulsatoire, commandée par une électro-vanne à impulsions. Dans ce procédé, il est prévu de vider au préalable les gaines des armatures de l'eau qu'elles contiennent et de les assécher à l'air comprimé, ce qui suppose que le milieu environnant les armatures est relativement dégradé (vides, fissures, etc.).Document FR-A-2 116 618 proposes a process, capable of remedying the effects of oxidation on active reinforcements, this term being taken in its sense the wider. First, we drill in the mass of concrete a channel opening opposite the reinforcement which must be protected. Then injected under pressure into the channel a mortar and / or a solution inhibiting corrosion until it bleeds outwards. The injection is carried out using a pneumatic pump pulsating, controlled by a pulsed solenoid valve. In this process, it is planned to empty the sheaths of the armatures of the water which they contain and of dry them with compressed air, which supposes that the medium surrounding the reinforcements is relatively degraded (empty, cracks, etc.).
Dans le document GB-A-1 480 718, un mortier de ragréage est injecté pour combler des défauts de porosité dans des structures tels que fissures, crevasses, etc. L'injection est obtenue en utilisant une pompe à fluctuation de pression alternative, obtenue par le mouvement d'un piston dans un cylindre ("fluid hammering").In GB-A-1 480 718, a mortar patching is injected to fill defects in porosity in structures such as cracks, crevices, etc. The injection is obtained using a pump alternating pressure fluctuation, obtained by the movement of a piston in a cylinder ("fluid hammering").
L'invention est telle qu'exprimée dans la
revendication 1 et consiste donc à utiliser le
procédé tel que décrit dans le document FR-A-2 116 618,
mais en appliquant à la solution inhibitrice de corrosion
une onde pulsatoire de haute puissance et de fréquence
telle que les ondes acoustiques produites (ultrasons) en
favorisent la pénétration.The invention is as expressed in the
La haute fréquence est associée à un phénomène inexistant dans l'état de la technique: les ondes acoustiques de forte puissance qui sont produites créent dans le liquide un état de cavitation qui permet de dégager les entrées conduisant aux microfissures et interstices. De plus, les ondes acoustiques produites dans le liquide mettent en vibration les microfissures et les interstices qui s'ouvrent et se referment en phase à la fréquence de l'onde ultrasonore et permettent ainsi au liquide de progresser dans le milieu constitué par le coulis de ciment de protection.High frequency is associated with phenomenon nonexistent in the state of the art: waves high-power acoustics that are produced create in the liquid a state of cavitation which allows to release the entrances leading to microcracks and interstices. In addition, the acoustic waves produced in the liquid vibrate microcracks and interstices which open and close in phase at the frequency of the ultrasonic wave and thus allow the liquid to progress in the environment of cement grout protection.
L'art antérieur décrit par le document FR-A-2 116 618 propose un procédé de réparation et d'injection de résines, ciment, etc. dans les gaines de renforcement, qui cependant est différent de la présente invention. En effet, il suppose que les gaines sont soit abímées, soit mal injectées. Selon la présente invention, la présence de défauts tels que crevasses, fissures, vides, etc., n'est pas nécessaire et le liquide progresse dans une gaine même parfaitement injectée de coulis de ciment. Le liquide inhibiteur de corrosion, une fois injecté dans la gaine, progresse en premier lieu dans les microfissures et le long des armatures. L'intégralité du coulis de ciment poreux est imprégnée par capillarité.The prior art described in document FR-A-2 116,618 proposes a repair and injection process for resins, cement, etc. in the reinforcement sheaths, which however is different from this invention. Indeed, it assumes that the sheaths are either damaged or badly injected. According to the present invention, the presence of faults such as crevices, cracks, voids, etc., is not necessary and the liquid progresses in a sheath even perfectly injected with cement grout. The corrosion inhibitor liquid, once injected into the sheath, progresses primarily in microcracks and along the reinforcements. The entire cement grout porous is permeated by capillary action.
La présente invention permet donc d'amplifier la diffusion du liquide concerné dans les microfissures et interstices du milieu. Ceux-ci sont extrêmement petits (microscopiques) par rapport à de simples défauts, tels que cavités, fissures, vides, etc., desquels il faut les distinguer. Autrement dit, le liquide n'est pas seulement injecté dans les cavités qui sont des défauts du milieu mais est injecté également dans les microfissures qui sont naturellement présentes dans le ciment du fait du retrait de celui-ci lors de la prise.The present invention therefore allows to amplify the diffusion of the liquid concerned in the microcracks and interstices of the medium. These are extremely small (microscopic) compared to simple defects, such as cavities, cracks, voids, etc., from which they must be distinguished. In other words, the liquid is not only injected into the cavities which are medium faults but is also injected into the microcracks that are naturally present in the cement due to its removal when setting.
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 a particular embodiment and when the active armature is surrounded by a sheath such that used in pre- or post-stress, the channel is drilled above, through said sheath so that the corrosion inhibiting solution may come into contact with the armature, or the set of wires or strands to protect and then inject a cement grout to fill the pores and voids of the grout sheath injection.
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 drill a second channel leading to the armature to be protected in order to control the flow of the inhibitor solution along said reinforcement respectively inside the aforementioned sheath.
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 benefits of the invention will emerge from the description which will be given below. This description is given only for example and does not limit the invention. The ratings of reference 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 a installation illustrating the process 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 one more large scale a detail of the installation according to the figure 1, suitable for 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 stages 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
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 we drill in the
Dans le canal 4 ainsi foré on injecte une
solution inhibitrice de corrosion à laquelle est appliqué
un champ pulsatoire de haute puissance.In
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 a pump pulsating alternative.
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.A suitable ultrasonic transmitter particularly to the application of the process according to the invention is known as the "sonotrode" built and marketed by 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 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. An alternative pulse pump of
high frequency suitable for the application of the process according to
the invention is shown schematically in the various
figures by
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 process according to the invention,
as shown in Figure 1, we note
that
Les canaux 4' permettent de contrôler
le cheminement de la solution inhibitrice le long des
armatures 2, respectivement à l'intérieur de la gaine
3.4 'channels allow control
the path of the inhibitor solution along 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 check the correct operation of the process by observing the path inhibitory 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
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 as far as these fall within the framework of attached claims.
Claims (7)
- A method for protecting active armourings (2) embedded in a concrete mass (1) against oxidation effects, said armourings being adapted to be conformed as a plurality of threads or strands arranged in a sheath (3), while enhancing the imperfections of the injection filling and comprising, in a first step, drilling into the concrete mass a channel (4) emerging opposite the armouring to be protected, and then injecting into said channel a corrosion inhibiting solution, to which a high power pulsatory wave adapted to make it enter is applied, characterized in that said high power pulsatory wave is generated by an alternative pulsatory pump with a sufficiently high frequency (5) to generate a pulsated effect in said solution by creating ultrasounds, while putting said solution under pressure.
- The method according to claim 1, characterized in that said channel (4) is drilled through the sheath (3) enclosing the active armouring so that the corrosion inhibiting solution can come in contact with said active armouring (2).
- The method according to claim 2, characterized in that at least a second channel (4') is drilled which emerges opposite the armouring to be protected, through the sheath, so as to monitor the inhibiting solution progress along said armouring respectively within the above-mentioned sheath.
- The method according to any one of the claims 1 to 3, characterized in that the injection filling is injected to fill out the imperfections inside the sheath enclosing the active armouring, when the corrosion inhibiting solution injection is completed.
- The method according to any one of the claims 1 to 4, characterized in that the alternative pulsatory pump (5) is a high power ultrasonic emitter.
- The method according to any one of the claims 1 to 5, characterized in that a tube (6) closely integral with either the channel wall or the above-mentioned sheath is introduced into each of the above-mentioned channels adapted for the inhibiting solution to be injected.
- The method according to claim 5 or 6, characterized in that the application of the high power pulsatory wave to the corrosion inhibiting solution flows into microcracks and gaps being present in the concrete mass.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
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 |
EP95870020A EP0733757B1 (en) | 1995-03-06 | 1995-03-06 | Method for protecting concrete-embedded reinforcing elements against oxidation effects |
PT95870020T PT733757E (en) | 1995-03-06 | 1995-03-06 | PROTECTION PROCEDURE AGAINST THE EFFECTS OF THE OXIDATION OF THE EMBEDDED ARMORS IN A BETA |
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 EP0733757A1 (en) | 1996-09-25 |
EP0733757B1 true 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) |
Families Citing this family (8)
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 |
US8911835B2 (en) * | 2010-02-01 | 2014-12-16 | Pmd-Ateav Systems Sprl | Method and system for injecting liquid in a porous material |
US8603603B2 (en) | 2011-02-07 | 2013-12-10 | Cortec Corporation | Corrosion inhibiting systems |
US20140048975A1 (en) * | 2012-08-14 | 2014-02-20 | David Whitmore | Corrosion Protection of Cables in a Concrete Structure |
Family Cites Families (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 |
DE3724559A1 (en) * | 1987-07-24 | 1989-02-02 | Hilti Ag | METHOD FOR STRENGTHENING TORN COMPONENTS |
SE9101542L (en) * | 1991-05-22 | 1992-11-23 | Ingvar Bogdanoff | METHOD OF INJECTING MOUNTAIN OR CONCRETE AND DEVICE BEFORE PERFORMING THE METHOD |
-
1995
- 1995-03-06 DK DK95870020T patent/DK0733757T3/en active
- 1995-03-06 ES ES95870020T patent/ES2158065T3/en not_active Expired - Lifetime
- 1995-03-06 EP EP95870020A patent/EP0733757B1/en not_active Expired - Lifetime
- 1995-03-06 AT AT95870020T patent/ATE202613T1/en active
- 1995-03-06 DE DE69521492T patent/DE69521492T2/en not_active Expired - Lifetime
- 1995-03-06 PT PT95870020T patent/PT733757E/en unknown
-
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
Also Published As
Publication number | Publication date |
---|---|
DK0733757T3 (en) | 2001-10-29 |
ES2158065T3 (en) | 2001-09-01 |
EP0733757A1 (en) | 1996-09-25 |
DE69521492T2 (en) | 2002-06-06 |
GR3036465T3 (en) | 2001-11-30 |
US5840247A (en) | 1998-11-24 |
DE69521492D1 (en) | 2001-08-02 |
PT733757E (en) | 2001-12-28 |
ATE202613T1 (en) | 2001-07-15 |
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