EP0733757B1 - Procédé de protection contre les effets de l'oxydation sur des armatures actives noyées dans une masse de béton - Google Patents
Procédé de protection contre les effets de l'oxydation sur des armatures actives noyées dans une masse de béton 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
- Authority
- EP
- European Patent Office
- Prior art keywords
- sheath
- solution
- armouring
- channel
- high power
- Prior art date
- 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.)
- Expired - Lifetime
Links
- 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.
Landscapes
- 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)
- Fuel-Injection Apparatus (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Reinforcement Elements For Buildings (AREA)
Description
Claims (7)
- Procédé de protection contre les effets de l'oxydation sur des armatures actives (2) noyées dans une masse de béton (1), lesdites armatures pouvant se présenter sous forme d'ensemble de fils ou de torons disposés dans une gaine (3), en mettant en évidence les imperfections du coulis d'injection et comprenant dans un premier temps, le forage dans la masse de béton d'un canal (4) débouchant face à l'armature qui doit être protégée, ensuite l'injection dans ledit canal d'une solution inhibitrice de corrosion, à laquelle est appliquée une onde pulsatoire de haute puissance destinée à la faire pénétrer, caractérisé en ce que ladite onde pulsatoire de haute puissance est produite par une pompe pulsatoire alternative de fréquence suffisamment élevée (5) pour provoquer un effet pulsé dans ladite solution en créant des ultrasons, tout en plaçant ladite solution sous pression .
- Procédé selon la revendication 1, caractérisé en ce que, on fore le canal (4) précité au travers de la gaine (3) entourant l'armature active de telle sorte que la solution inhibitrice de corrosion puisse entrer en contact avec ladite armature active (2).
- Procédé selon la revendication 2, caractérisé en ce qu'on fore au moins un second canal (4') débouchant face à l'armature à protéger, au travers de la gaine, afin de contrôler le cheminement de la solution inhibitrice le long de ladite armature respectivement à l'intérieur de la gaine précitée.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le coulis d'injection est injecté pour combler les imperfections dans la gaine entourant l'armature active, lorsque l'injection de solution inhibitrice de corrosion est achevée.
- Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la pompe pulsatoire alternative (5) est un émetteur ultrasonore de haute puissance.
- Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'on introduit dans chacun des canaux précités destinés à l'injection de la solution inhibitrice un tube (6) solidarisé intimement soit de la paroi du canal, soit de la gaine précitée.
- Procédé selon l'une quelconque des revendications 5 à 6, caractérisé en ce que l'application de l'onde pulsatoire de haute puissance à la solution inhibitrice de corrosion pénètre dans des microfissures et interstices présents dans la masse de béton.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES95870020T ES2158065T3 (es) | 1995-03-06 | 1995-03-06 | Procedimiento de proteccion contra los efectos de la oxidacion sobre unas armaduras activas embebidas en una masa de hormigon. |
PT95870020T PT733757E (pt) | 1995-03-06 | 1995-03-06 | Processo de proteccao contra os efeitos da oxidacao das armaduras embebidas numa massa de betao |
DK95870020T DK0733757T3 (da) | 1995-03-06 | 1995-03-06 | Fremgangsmåde til beskyttelse imod oxideringseffekter på aktiv armering indlejret i beton |
EP95870020A EP0733757B1 (fr) | 1995-03-06 | 1995-03-06 | Procédé de protection contre les effets de l'oxydation sur des armatures actives noyées dans une masse de béton |
DE69521492T DE69521492T2 (de) | 1995-03-06 | 1995-03-06 | Verfahren zum Schützen gegen Oxydations-Effekte von in Beton eingebettete Bewährungselemente |
AT95870020T ATE202613T1 (de) | 1995-03-06 | 1995-03-06 | Verfahren zum schützen gegen oxydations-effekte von in beton eingebettete bewährungselemente |
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 (fr) | 1995-03-06 | 1995-03-06 | Procédé de protection contre les effets de l'oxydation sur des armatures actives noyées dans une masse de béton |
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 (fr) | 1996-09-25 |
EP0733757B1 true EP0733757B1 (fr) | 2001-06-27 |
Family
ID=26140792
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95870020A Expired - Lifetime EP0733757B1 (fr) | 1995-03-06 | 1995-03-06 | Procédé de protection contre les effets de l'oxydation sur des armatures actives noyées dans une masse de béton |
Country Status (8)
Country | Link |
---|---|
US (1) | US5840247A (fr) |
EP (1) | EP0733757B1 (fr) |
AT (1) | ATE202613T1 (fr) |
DE (1) | DE69521492T2 (fr) |
DK (1) | DK0733757T3 (fr) |
ES (1) | ES2158065T3 (fr) |
GR (1) | GR3036465T3 (fr) |
PT (1) | PT733757E (fr) |
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 (fr) * | 2000-12-18 | 2003-02-14 | Alto Btp | Procede de protection, de reparation et de consolidation d'ouvrages d'arts comportant des elements metalliques inclus dans une matrice en beton, platre, ciment ou mortier |
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 |
MX2012008856A (es) | 2010-02-01 | 2012-11-29 | Pmd Ateav Systems Sprl | Procedimiento y sistema de inyeccion de un liquido en un material poroso. |
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 (de) * | 1987-07-24 | 1989-02-02 | Hilti Ag | Verfahren zur verfestigung gerissener bauteile |
SE9101542L (sv) * | 1991-05-22 | 1992-11-23 | Ingvar Bogdanoff | Metod att injektera berg eller betong samt anordning foer utfoerande av metoden |
-
1995
- 1995-03-06 DE DE69521492T patent/DE69521492T2/de not_active Expired - Lifetime
- 1995-03-06 DK DK95870020T patent/DK0733757T3/da active
- 1995-03-06 AT AT95870020T patent/ATE202613T1/de active
- 1995-03-06 ES ES95870020T patent/ES2158065T3/es not_active Expired - Lifetime
- 1995-03-06 PT PT95870020T patent/PT733757E/pt unknown
- 1995-03-06 EP EP95870020A patent/EP0733757B1/fr 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/el unknown
Also Published As
Publication number | Publication date |
---|---|
GR3036465T3 (en) | 2001-11-30 |
ATE202613T1 (de) | 2001-07-15 |
DE69521492D1 (de) | 2001-08-02 |
ES2158065T3 (es) | 2001-09-01 |
DK0733757T3 (da) | 2001-10-29 |
EP0733757A1 (fr) | 1996-09-25 |
DE69521492T2 (de) | 2002-06-06 |
PT733757E (pt) | 2001-12-28 |
US5840247A (en) | 1998-11-24 |
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