NO880840L - PREVENTION FOR CONCRETE TREATMENT. - Google Patents
PREVENTION FOR CONCRETE TREATMENT.Info
- Publication number
- NO880840L NO880840L NO88880840A NO880840A NO880840L NO 880840 L NO880840 L NO 880840L NO 88880840 A NO88880840 A NO 88880840A NO 880840 A NO880840 A NO 880840A NO 880840 L NO880840 L NO 880840L
- Authority
- NO
- Norway
- Prior art keywords
- concrete
- electrolysis
- wetting
- ions
- water
- Prior art date
Links
- 239000004567 concrete Substances 0.000 title claims description 35
- 230000002265 prevention Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims description 17
- 238000005868 electrolysis reaction Methods 0.000 claims description 13
- 150000002500 ions Chemical class 0.000 claims description 12
- 238000009736 wetting Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 9
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- -1 sulphate ions Chemical class 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/53—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone involving the removal of at least part of the materials of the treated article, e.g. etching, drying of hardened concrete
- C04B41/5369—Desalination, e.g. of reinforced concrete
- C04B41/5376—Electrochemical desalination
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/72—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone involving the removal of part of the materials of the treated articles, e.g. etching
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Water Supply & Treatment (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Processing Of Solid Wastes (AREA)
- Fire-Extinguishing Compositions (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Working Measures On Existing Buildindgs (AREA)
Description
Den foreliggende oppfinnelse vedrører en fremgangsmåte til The present invention relates to another method
behandling av betong, av den i innledningen i krav 1 angitte art. treatment of concrete, of the type specified in the introduction in claim 1.
Bruken av armert betong, både i broer og bygninger, har økt betydelig de senere år. Det er blitt vanlig å anvende stadig smekrere konstruksjoner og derved en bedre materialutnyttelse. The use of reinforced concrete, both in bridges and buildings, has increased significantly in recent years. It has become common to use ever flatter constructions and thereby a better utilization of materials.
Man kan derved oppnå rimeligere og sterkere konstruksjoner, menOne can thereby achieve cheaper and stronger constructions, but
de blir mer utsatt for korrosjonsproblemer, særlig på steder nær saltvann og steder hvor veiene saltes om vinteren. Dette fører til kraftig økning av kloridionekonsetrasjonen, som i sin tur medfører dannelse av saltsyre og korrosjonsproblemer. they are more prone to corrosion problems, especially in places near salt water and places where the roads are salted in winter. This leads to a sharp increase in the chloride ion concentration, which in turn leads to the formation of hydrochloric acid and corrosion problems.
Det er blitt forsøkt på flere måter å redusere problemene.Attempts have been made in several ways to reduce the problems.
En metode er å forsegle betongen med et overflatebelegg som skal hindre inntrengning av de korrosjonsfremmende forbindelser, såsom kloridioner, sulfationer, karbondioksid og oksygen. Det er imid-^ lert.id vanskelig å oppnå et helt tett belegg, og dessuten vil dette nedbrytes med tiden og derved igjen gi adgang til nevnte forbindelser. På steder der det allerede er begynt å korrodere er det ikke mulig å avbryte korrosjonsprosessen med et slikt for-seglingsbelegg. One method is to seal the concrete with a surface coating which will prevent the penetration of the corrosion-promoting compounds, such as chloride ions, sulphate ions, carbon dioxide and oxygen. It is immid-^ lert.id difficult to achieve a completely tight coating, and moreover this will break down over time and thereby once again give access to the aforementioned compounds. In places where corrosion has already begun, it is not possible to interrupt the corrosion process with such a sealing coating.
En annen måte å møte problemet på er ved hjelp av katodisk beskyttelse med påtrykt spenning. Et generelt problem med denne metode er regulering av spenningen. Et spesielt problem er at mar ikke tør benytte metoden i forspente konstruksjoner. Another way to deal with the problem is by means of cathodic protection with applied voltage. A general problem with this method is regulation of the voltage. A particular problem is that mar does not dare to use the method in prestressed constructions.
I og med at korrosjon er en elektrokjemisk prosess er det nærliggende å benytte seg av elektrolyse for å fjerne kloridy ioner. Imidlertid fører elektrolyse av armert betong, hver ar-mer ingsj ernet er den ene elektrode, til at minskningen av ione-, konsentrasjonen blir størst ved armeringsstålet, mens mar oppnår stadig mindre effekt jo større avstanden til armerings:-tålet As corrosion is an electrochemical process, it is natural to use electrolysis to remove chloride ions. However, electrolysis of reinforced concrete, each reinforcing iron being the one electrode, leads to the reduction of the ion concentration being greatest at the reinforcing steel, while mar achieves less and less effect the greater the distance to the reinforcing steel
Viktig informasjonimportant information
Av arkivmessige grunner har Patentstyret for denne allment tilgjengelige patentsøknad kun tilgjengelig dokumenter som inneholder håndskrevne anmerkninger, kommentarer eller overstrykninger, eller som kan være stemplet "Utgår" eller lignende. Vi har derfor måtte benytte disse dokumentene til skanning for å lage en elektronisk utgave. For archival reasons, the Norwegian Patent Office only has access to documents for this generally available patent application that contain handwritten notes, comments or crossing outs, or that may be stamped "Expired" or the like. We have therefore had to use these documents for scanning to create an electronic edition.
Håndskrevne anmerkninger eller kommentarer har vært en del av saksbehandlingen, og skal ikke benyttes til å tolke innholdet i dokumentet. Handwritten remarks or comments have been part of the proceedings, and must not be used to interpret the content of the document.
Overstrykninger og stemplinger med "Utgår" e.l. indikerer at det under saksbehandlingen er kommet inn nyere dokumenter til erstatning for det tidligere dokumentet. Slik overstrykning eller stempling må ikke forstås slik at den aktuelle delen av dokumentet ikke gjelder. Cross-outs and stampings with "Expired" etc. indicates that newer documents have been received during the proceedings to replace the earlier document. Such crossing out or stamping must not be understood as meaning that the relevant part of the document does not apply.
Vennligst se bort fra håndskrevne anmerkninger, kommentarer eller overstrykninger, samt eventuelle stemplinger med "Utgår" e.l. som har samme betydning. Please ignore handwritten remarks, comments or crossing outs, as well as any stamps with "Expired" etc. which have the same meaning.
blir. Ved stor senteravstand mellom armeringsjernene vil elektrolyse kunne fjerne ioner fra betongen nær amering og fra betongen mellom armering og anode. Derved oppnår man ikke full-; becomes. If there is a large center distance between the reinforcing bars, electrolysis will be able to remove ions from the concrete near the reinforcement and from the concrete between the reinforcement and the anode. Thereby one does not achieve full-;
stendig fjerning av ionene fra betongen, kun en flytting inne i betongen og derved fare for nytt angrep på armeringsstålet når elektrolysen er avsluttet, og det er gått en tid igjen. constant removal of the ions from the concrete, only a movement inside the concrete and thereby the risk of a new attack on the reinforcing steel when the electrolysis is finished, and some time has passed.
Det er også gjort forsøk med vann av varierende temperatur,Experiments have also been carried out with water of varying temperature,
se R. Fray og B. Weber, T,Z-Fachberichte, Vol 106, nr. 6, 1982,see R. Fray and B. Weber, T,Z-Fachberichte, Vol 106, No. 6, 1982,
p. 402-406, for å lute ut de korrosjonsfremmende ioner fra betong. Men det er klart at det vil være problematisk å kunne tilføre varmt vann i større mengder til f.eks. en bro, og det vil dessuten i mange tilfeller være vanskelig å oppnå tilfredS7stiJ-^lerxde j/anj^imtrejig^ning i løpet av rimelig tid^yTiT~sTutt må p. 402-406, to leach out the corrosion-promoting ions from concrete. But it is clear that it will be problematic to be able to add hot water in larger quantities to e.g. a bridge, and it will also be difficult in many cases to achieve satisfactory construction within a reasonable time.
det nevnes at reparasjon også ut f øresir^ og^ detT er faktisk det van^ fligste, ved fjerning av "syk" betong og støping av ny overdekning I på armeringsstålet. En slik metode er meget tidkrevende og kost7bar... , it is mentioned that repair is also carried out, and it is actually the most common, by removing "sick" concrete and casting a new covering on the reinforcing steel. Such a method is very time-consuming and costly... ,
Det er således stadig behov for bedre metoder og apparaterThere is thus a constant need for better methods and devices
for å redusere disse problemer, og formålet med den foreliggende oppfinnelse er nettopp å frembringe en fremgangsmåte som gjør det mulig å fjerne ioner fra betong på hurtigere, rimeligere og sikrere måte enn det som har vært mulig med kjente fremgangs- to reduce these problems, and the purpose of the present invention is precisely to produce a method which makes it possible to remove ions from concrete in a faster, more affordable and safer way than has been possible with known methods
måter .ways.
Fremgangsmåten ifølge oppfinnelsen kjennetegnes ved deThe method according to the invention is characterized by the
trekk som er angitt i karakteristikken i krav 1.feature that is stated in the characteristic in claim 1.
Som elektrolytt ved elektrolysen har kalsiumhydroksid vistAs an electrolyte in the electrolysis, calcium hydroxide has been shown
seg å være meget velegnet. Konsentrasjonen vil vanligvis være 1 molar. proved to be very suitable. The concentration will usually be 1 molar.
Et egnet anodemateriale er nikkel, som imidlertid er f or 7 holdsvis kostbart. Alternativt anvendes det f.eks. rustfritt stål. Anoden har fortrinnsvis form av en finmasket duk, som bør dekke mest mulig av betongoverflaten. A suitable anode material is nickel, which is, however, relatively expensive. Alternatively, e.g. stainless steel. The anode is preferably in the form of a fine mesh cloth, which should cover as much of the concrete surface as possible.
Dersom det er lite fuktighet i betongen vil første trinn i behandlingen være fuktig med vann, f.eks. ved overrisling med stigende temperatur til minst 80°C i fuktingsperioden. Derved vil vannløselige salter, særlig klorider, på og nær betongens overflate gå i løsning, mens vannet løser saltene lenger inne i betongen i mindre grad. Salt- (og derved ione-) konsentrasjonen i vannet vil jevnes ut, dvs. at ioner vil vandre ut mot og på overflaten av betongen. Varigheten og her fukting vil variere med flere faktorer, f.eks. tempel^alSruir~og^ I forsøk har fukting i 1/273/4 time vært benyttet. Vannet på betongens overflate vil fordampe, og ifølge oppfinnelsen akseleres fordamp — friingen ved tilførsel av varm luft, hvorved salter som er i løs- If there is little moisture in the concrete, the first step in the treatment will be moist with water, e.g. by sprinkling with rising temperature to at least 80°C during the wetting period. Thereby, water-soluble salts, especially chlorides, on and near the surface of the concrete will go into solution, while the water dissolves the salts further inside the concrete to a lesser extent. The salt (and thereby ion) concentration in the water will be evened out, i.e. that ions will migrate out towards and onto the surface of the concrete. The duration and here wetting will vary with several factors, e.g. temple^alSruir~og^ In experiments, humidification for 1/273/4 hour has been used. The water on the surface of the concrete will evaporate, and according to the invention, evaporation is accelerated — the release by the supply of hot air, whereby salts that are in solution
ning vil vandre mot det sted hvor varmen tilføres og fordamp-will migrate towards the place where the heat is supplied and evaporates
ningen foregår, nemlig betongens overflate. Derved utlutes salter fra betongen, og ved ny fukting trenger vannet lenger ned i be^ning takes place, namely the surface of the concrete. Thereby, salts are leached from the concrete, and upon rewetting, the water penetrates further into the concrete
tongen og løser opp salter. Ved ny tørking trekkes de ioner som er gått i løsning mot betongens overflate. the tongue and dissolves salts. When re-drying, the ions that have gone into solution are pulled towards the surface of the concrete.
Syklusen fukting/tørking kan gjentas et antall ganger somThe wetting/drying cycle can be repeated as many times as
også er avhengig av flere parametre såsom temperatur, betong^kvalitet og overdekning av armeringsjernet 2- 2 ganger fukting og tørking synes å være hensiktsmessig i praksis. also depends on several parameters such as temperature, concrete^quality and covering of the rebar 2- 2 times wetting and drying seems to be appropriate in practice.
Etter fuktingen av betongen er det fordelaktig å spyle be^tongoverflaten med vann for å fjerne salter. After wetting the concrete, it is advantageous to rinse the concrete surface with water to remove salts.
Det er grenser for hvor langt inn i betongen man i løpet avThere are limits to how far into the concrete you can go in the course of
et praktisk akseptabelt tidsrom kan bevirke vandring av ioner ved fukting/tørking av betong. Av den grunn kombineres nevnte syklus a practically acceptable period of time can cause migration of ions when wetting/drying concrete. For that reason, the mentioned cycle is combined
med elektrolyse. Etter at betongen er tørket etter syklusen med fukting/tørking er avsluttet, påtrykkes betongen likestrøm, hvor7with electrolysis. After the concrete has dried after the wetting/drying cycle has ended, direct current is applied to the concrete, where7
ved som regel armeringen anvendes som katode. Ved elektrolysen vil ionene vandre i det påtrykte elektriske felt bort fra armeringen i retning mot anoden som når det dreier seg om en for-holdsvis plan flate kan befinne seg på den ene eller begge sider i forhold til armeringen. Som elektrolytt har kalsiumhydroksid vist seg hensiktsmessig. Den inneholder fortrinnsvis en ione-bytterharpiks som kan "fange opp" ioner før disse når frem til anoden hvor kloridioner vil kunne forårsake klorgassutvikling. as a rule, the reinforcement is used as the cathode. During the electrolysis, the ions will migrate in the applied electric field away from the reinforcement in the direction towards the anode, which when it is a relatively flat surface can be on one or both sides in relation to the reinforcement. As an electrolyte, calcium hydroxide has proven suitable. It preferably contains an ion-exchange resin that can "capture" ions before they reach the anode where chloride ions can cause chlorine gas evolution.
Ved elektrolysen anvendes det spenninger på over 50 volt. Etter avsluttet elektrolyse spyles og tørkes betongen, hvoretter den eventuelt forsegles med et i og for seg kjent stoff. During electrolysis, voltages of over 50 volts are used. After completion of electrolysis, the concrete is rinsed and dried, after which it is possibly sealed with a substance known in and of itself.
En utførelsesform av fremgangsmåten ifølge oppfinnelsen erAn embodiment of the method according to the invention is
vist skjematisk på den medfølgende tegning.shown schematically in the accompanying drawing.
Først fuktes betongen med vann med temperatur stigendeFirst, the concrete is moistened with water at a rising temperature
jevnt opp til ca. 80° i 1/273/4 time, hvoretter den tørkes med varm luft i omtrent samme tidsrom. Fukting/tørking gjentas to eller tre ganger. Deretter fuktes betongen igjen i like lang tid, evenly up to approx. 80° for 1/273/4 hour, after which it is dried with hot air for about the same time. Wetting/drying is repeated two or three times. The concrete is then moistened again for the same amount of time,
hvoretter den underkastes elektrolyse med armeringen som katode. Etter avsluttet elektrolyse gjentas fuktingen/tørkingen om nød-vendig. Deretter tørkes og forsegles betongen. after which it is subjected to electrolysis with the reinforcement as cathode. After completion of electrolysis, wetting/drying is repeated if necessary. The concrete is then dried and sealed.
Dersom betong er relativt fuktig kan man i fremgangsmåten begynne med tørking og altså utelate den første fukting. If the concrete is relatively moist, the procedure can begin with drying and thus omit the first wetting.
Med fremgangsmåten ifølge oppfinnelsen har man både i laboratorieforsøk og i feltforsøk oppnådd betydelig reduksjon av kloridinnholdet i betong. With the method according to the invention, a significant reduction of the chloride content in concrete has been achieved both in laboratory tests and in field tests.
Claims (3)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO88880840A NO880840L (en) | 1988-02-26 | 1988-02-26 | PREVENTION FOR CONCRETE TREATMENT. |
| KR1019890701955A KR900700705A (en) | 1988-02-26 | 1989-02-23 | Concrete treatment method |
| PCT/NO1989/000014 WO1989008170A1 (en) | 1988-02-26 | 1989-02-23 | Process for the treatment of concrete |
| AU31899/89A AU3189989A (en) | 1988-02-26 | 1989-02-23 | Process for the treatment of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO88880840A NO880840L (en) | 1988-02-26 | 1988-02-26 | PREVENTION FOR CONCRETE TREATMENT. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NO880840D0 NO880840D0 (en) | 1988-02-26 |
| NO880840L true NO880840L (en) | 1989-08-28 |
Family
ID=19890692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO88880840A NO880840L (en) | 1988-02-26 | 1988-02-26 | PREVENTION FOR CONCRETE TREATMENT. |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR900700705A (en) |
| AU (1) | AU3189989A (en) |
| NO (1) | NO880840L (en) |
| WO (1) | WO1989008170A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU605015B2 (en) * | 1988-01-04 | 1991-01-03 | Norwegian Concrete Technologies A.S. | Method to stop alkali-aggregate reactions in concrete etc., and means to carry out this method |
| US5637412A (en) * | 1990-05-18 | 1997-06-10 | E. Khashoggi Industries | Compressed hydraulically bonded composite articles |
| AU7962291A (en) * | 1990-05-18 | 1991-12-10 | E. Khashoggi Industries | Hydraulically bonded cement compositions and their methods of manufacture and use |
| US5609692A (en) * | 1994-05-05 | 1997-03-11 | Chlor Rid International, Inc. | Method of removing chloride ion or a compound thereof from a surface contaminated therewith |
| CH692297A5 (en) * | 1996-05-19 | 2002-04-30 | Hans Joachim Badzong Dipl Ing | Calcium hydroxide-Realkalisierungsverfahren. |
| GB2322139A (en) * | 1997-02-15 | 1998-08-19 | Fosroc International Ltd | Electrochemical treatment of concrete |
| DE60223904T2 (en) | 2001-01-26 | 2008-11-27 | Btg International Ltd. | BENZYLAMINANALOGEN |
| HUE059029T2 (en) | 2013-10-02 | 2022-10-28 | Becor As | Method for removing salts and negative chloride ions from porous materials |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2683916A (en) * | 1952-05-23 | 1954-07-20 | Joseph C Kelly | Method of accelerating the hardening of concrete slabs |
| DE2722985C3 (en) * | 1977-05-20 | 1981-09-10 | Institutul De Cercetari In Constructii Si Economia Constructiilor - Incerc, Bucuresti | Process for draining or maintaining basement masonry through active electroosmotic drainage |
| US4506485A (en) * | 1983-04-12 | 1985-03-26 | State Of California, Department Of Transportation | Process for inhibiting corrosion of metal embedded in concrete and a reinforced concrete construction |
| NO156729C (en) * | 1985-04-17 | 1987-11-11 | Norsk Teknisk Bygge Noteby | EXCHANGE OF CHLORIDE FROM CONCRETE. |
-
1988
- 1988-02-26 NO NO88880840A patent/NO880840L/en unknown
-
1989
- 1989-02-23 WO PCT/NO1989/000014 patent/WO1989008170A1/en unknown
- 1989-02-23 KR KR1019890701955A patent/KR900700705A/en not_active Application Discontinuation
- 1989-02-23 AU AU31899/89A patent/AU3189989A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| KR900700705A (en) | 1990-08-16 |
| AU3189989A (en) | 1989-09-22 |
| NO880840D0 (en) | 1988-02-26 |
| WO1989008170A1 (en) | 1989-09-08 |
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