EP0961927A1 - Electrode component group for a corrosion measuring system for detecting corrosion in a metal embedded in a component made of an ion-conducting material, in particular concrete - Google Patents
Electrode component group for a corrosion measuring system for detecting corrosion in a metal embedded in a component made of an ion-conducting material, in particular concreteInfo
- Publication number
- EP0961927A1 EP0961927A1 EP98906943A EP98906943A EP0961927A1 EP 0961927 A1 EP0961927 A1 EP 0961927A1 EP 98906943 A EP98906943 A EP 98906943A EP 98906943 A EP98906943 A EP 98906943A EP 0961927 A1 EP0961927 A1 EP 0961927A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rings
- electrode
- electrode assembly
- assembly according
- base body
- 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.)
- Withdrawn
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 38
- 230000007797 corrosion Effects 0.000 title claims abstract description 35
- 238000005260 corrosion Methods 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 10
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 239000004020 conductor Substances 0.000 title abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 24
- 125000006850 spacer group Chemical group 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000004566 building material Substances 0.000 claims description 2
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical compound [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 description 1
- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/283—Means for supporting or introducing electrochemical probes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
Definitions
- the invention relates to an electrode assembly for a corrosion measuring system for determining corrosion of metal embedded in a component made of ion-conducting material, in particular concrete, according to the preamble of claim 1.
- Such ion-conducting materials, from which components for the use of the electrode assembly are, are in particular mineral building materials, such as mortar, cement, concrete, etc.
- Steel parts embedded in concrete, such as profiled steel girders or reinforcement inserts made of structural steel, are in a properly processed concrete component with a sufficiently thick concrete cover usually permanently protected against corrosion.
- This corrosion protection is not based on the impermeability of the concrete to liquids, but on the alkalinity of the concrete pore water, which normally has a pH> 12.5. Under these conditions, a thin, firmly adhering oxide layer forms on the steel surface, which practically completely prevents corrosion.
- reinforced concrete can be used for external components exposed to the weather.
- a corrosion measuring system for detecting corrosion of steel embedded in a concrete component which contains a plurality of anode electrodes made of normal structural steel which are spaced apart from one another in the concrete component and which are arranged at different depths in the concrete component and are electrically connected to at least one cathode electrode made of a nobler material via an externally accessible measuring circuit.
- the corrosion state of the respective anode electrode and thus the progress of the corrosion in the concrete component can be determined.
- the invention has for its object to provide an electrode assembly for a corrosion measuring system for detecting corrosion of metal embedded in a concrete component, which can be introduced in a simple manner subsequently into a concrete component whose corrosion is to be measured.
- the electrode assembly according to the invention which can be retrofitted into a hole or a bore in the component, a secure, flat and permanent contact between the electrode rings and the concrete is achieved.
- the sealing rings which lie sealingly against the component between the electrode rings, clearly defined, separate measuring ranges, each associated with an electrode ring, are created, which enable a precise analysis of the corrosion.
- FIG. 1 shows a longitudinal section through a first embodiment of an electrode assembly
- 2 shows a cross section through the electrode assembly according to FIG. 1, sectioned in the plane II-II
- FIG. 2 shows a longitudinal section through a second embodiment of an electrode assembly.
- an electrode assembly generally designated 2 has a rod-shaped base body 4, which forms a supporting part for the entire arrangement and ends at its left end in the figure in a flange part 6 with an enlarged diameter.
- the base body 4 has a recess or a longitudinal slot 8, from which a passage channel 10 extends through the flange part 6.
- the base body 4 has a threaded region 12, onto which a nut 14 is screwed. From the inside of the base body, a channel 16 leads through the base body to its right end according to FIG. 1 - the nut 14 lies, possibly with the interposition of a washer, on a clamping flange 18, which is longitudinally displaceable on the support part 4 and one opposite the Flange part 6 has an enlarged outer diameter.
- the base body 4 carries a plurality of spacer rings 20 between the flange parts 6 and 18, the side surfaces of which end in inclined surfaces 22 toward their outer circumferences. Electrode rings 24 and sealing rings 26 are arranged alternately between two spacer rings 20, a sealing ring preferably being arranged between the outermost spacer ring 20 and the flange part 6 or 18.
- the sealing rings made of elastic and electrically insulating material preferably have a round cross section.
- the electrode rings 24, which are preferably made of structural steel, have a trapezoidal cross section, the inclination of their side surfaces corresponding to the inclination of the inclined surfaces 22.
- the dimensioning of the spacer rings 20, electrode rings 24 and sealing rings 26 is such that their outer circumference in the loose state of the arrangement does not protrude beyond the outer circumference of the flange part 6.
- the base body 4 ends in a socket 30, in which an electrical line 32, which belongs in each case to one of the electrode rings 24 and is guided through the longitudinal slot 8 into the interior of the support part 4, is connected to a contact (not shown).
- the base body has flats 33 for attaching a tool, for. B. spanner on.
- a radial opening 34 is also provided, through which the channel 16 is accessible. The entire arrangement is inserted into a bore 35 which is made in a concrete component 36 and the inside diameter of which corresponds approximately to the outside diameter of the flange part 6.
- the sealing rings 26, spacer rings 20 and electrode rings 24 are first pushed onto the base body 4 in the order shown.
- the lines 32 connected to the electrode rings 24, for example by soldering, are inserted into the longitudinal slot 8 and pushed through the channel 16 so that they protrude on the right-hand side.
- the clamping flange 18 is pushed onto the base body 4 and the nut 14 is screwed on, so that the rings between the flange parts 6 and 18 are held on the base body 4.
- the lines 32 are connected to the connection socket 30, which is fastened to the base body 4. The arrangement is now ready for installation in a bore 35 in a concrete component 36.
- the arrangement with the flange part 6 is pushed into the bore 35 until the clamping flange 18 comes into contact with the outside of the concrete component 36.
- a seal is advantageously provided between the clamping flange 18 and the concrete component 36. arranges.
- the nut 14 is now rotated, the base body 4 being held against the flat 33 with an open-ended wrench.
- the flange part 6 is moved together with the base body 4 according to FIG. 1 to the right, so that the distance between the flange part 6 and the clamping flange 18 is reduced.
- the distance between the spacer rings 20 is reduced, so that the sealing rings 26 and the electrode rings 24 are pressed or spread outward.
- the dimensioning of the inclined surfaces 22 of the spacer rings 20 relative to the sealing rings 26 is such that the spacing rings 20 come into direct mutual contact before the sealing rings 26 are inadmissibly spread outwards and are thereby damaged.
- the sealing rings 20 thus come into perfect contact with the inner wall of the bore 35 and seal individual bore segments against one another.
- the electrode rings 24, which spread apart only with greater forces than the sealing rings 26, are spread apart or enlarged in their outer diameter, so that they also come into firm contact with the inner wall of the bore 35.
- the electrode rings 24 can, for example, be slotted to facilitate their spreading open (FIG. 2).
- the outer circumferences of the electrode rings 24 are provided with corrugation or knurling.
- the entire arrangement is held securely and with intimate contact in the bore 35 when the nut 14 is tightened sufficiently.
- Special grease is then pressed through the opening 34 into the interior of the base body 4, which fills the space between the rings and passes through the passage channel 10 into the bore 35.
- the transition area from the socket 30 to the support member 4 and the opening 34 are cast with resin, so that the entire arrangement is hermetically sealed to the outside.
- the electrode assembly 2 inserted into the bore 35 and fastened therein thus forms a sensor subdivided into different measuring chambers, each measuring chamber having an electrode ring 24 via which the penetration of pollutants into the concrete can be tracked in stages by the individual electrode rings being known per se Way to be connected to a measuring circuit.
- a cathode made of stainless steel or titanium coated with platinum oxide can be used separately as the counter electrode; the individual electrode rings 24 can also be connected to one another so that they deliver measurable currents under different corrosion conditions.
- one of the electrode rings 24 can also be made of noble metal and serve as a cathode. It goes without saying that the electrode rings 24 preferably consist of the same material as the reinforcement of the concrete component 36, the corrosion status of which is to be checked.
- the electrode rings 24 can be coupled to the concrete by direct AC resistance measurement between the electrode rings 24.
- the described spreading mechanism of the rings creates closed measuring zones at predetermined depths, so that, for example, chloride can only reach the side of the electrode rings from the outside and chloride transport along the wall of the bore 35 is not possible.
- connection socket 30 there is a resin filling which is electrically insulating and rigid. In the area of the rings, grease is pressed, which extends into the borehole.
- the electrode rings 24 must not be in electrical contact with one another via the spacer rings 26 and the base body 4, which is achieved by appropriate selection of materials, for example by the base body 4 or the spacer rings 20 being made of plastic or corresponding coatings being provided. It goes without saying that, in order to avoid overstressing the sealing rings 26, the spacer rings 20 can be provided with corresponding lateral shoulders which ensure appropriate spacing.
- FIG. 2 shows a cross section through the arrangement according to FIG. 1.
- a slot 38 of the electrode ring 24 is visible, which facilitates the widening, but correspondingly flexible electrode ring is not necessarily present.
- a soldering 40 of the line 32 to the electrode ring 24 can also be seen.
- the base body 4 is provided with a longitudinal groove 40, into which a rod 42 consisting, for example, of PVC is inserted, which engages in corresponding recesses in the spacer rings and secures them against rotation (not shown in FIG. 1).
- the anti-rotation device can also be formed directly by a protrusion running along the base body 4
- FIG. 3 shows an embodiment of the electrode assembly modified compared to FIG. 1:
- the clamping flange 18 is here hat-shaped overall and has an inner bottom 44 and an outer edge flange 46 which merge into one another via a cylindrical region 48.
- the rings 20, 24 and 26 are designed such that they are partially supported by the base body 4 and partially by the cylindrical region 48.
- the socket 30 formed at one end of the base body 4 is received in the interior of the hat-shaped clamping flange 48, so that this interior can be covered by a cap 50.
- the edge flange 46 is inserted into a recess of the concrete component 36 formed at the edge of the bore 35 with the interposition of a sealing ring 52, so that the entire arrangement is flush with the outside.
- the cover 50 is removed and a measuring circuit known per se is connected to the connecting socket 30, which measuring circuit optionally includes a cathode electrode which is introduced into the concrete component 36 separately from the electrode assembly 2.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19706510 | 1997-02-19 | ||
DE19706510A DE19706510C1 (en) | 1997-02-19 | 1997-02-19 | Electrode assembly for corrosion measuring system |
PCT/EP1998/000728 WO1998037403A1 (en) | 1997-02-19 | 1998-02-10 | Electrode component group for a corrosion measuring system for detecting corrosion in a metal embedded in a component made of an ion-conducting material, in particular concrete |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0961927A1 true EP0961927A1 (en) | 1999-12-08 |
Family
ID=7820797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98906943A Withdrawn EP0961927A1 (en) | 1997-02-19 | 1998-02-10 | Electrode component group for a corrosion measuring system for detecting corrosion in a metal embedded in a component made of an ion-conducting material, in particular concrete |
Country Status (9)
Country | Link |
---|---|
US (1) | US6281671B1 (en) |
EP (1) | EP0961927A1 (en) |
JP (1) | JP3742934B2 (en) |
KR (1) | KR20000075489A (en) |
AU (1) | AU6296498A (en) |
CA (1) | CA2282304A1 (en) |
DE (1) | DE19706510C1 (en) |
NO (1) | NO993975L (en) |
WO (1) | WO1998037403A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7034660B2 (en) | 1999-02-26 | 2006-04-25 | Sri International | Sensor devices for structural health monitoring |
KR100416935B1 (en) * | 2001-03-06 | 2004-01-31 | 학교법인 중앙대학교 | Ladder system for corrosion Monitoring |
US6646427B2 (en) * | 2001-05-02 | 2003-11-11 | Mmfx Steel Corporation Of America | Determination of chloride corrosion threshold for metals embedded in cementitious material |
CN100437084C (en) * | 2005-04-30 | 2008-11-26 | 华为技术有限公司 | Method for quantizing ionic pollution degree on circuit board |
JP4688080B2 (en) * | 2005-06-01 | 2011-05-25 | 太平洋セメント株式会社 | Corrosion sensor, sheath tube, sheath tube joint member and corrosion sensor unit |
DE102005028636B4 (en) * | 2005-06-20 | 2008-12-04 | Setzer, Max J., Prof. Dr.rer.nat. Dr.-Ing.habil. | Method and arrangement for determining the risk of corrosion in porous bodies |
DE202006018747U1 (en) * | 2006-12-08 | 2008-04-10 | Technische Universität Carolo-Wilhelmina Zu Braunschweig | Device for condition detection of steel-reinforced concrete components |
CN101299018B (en) * | 2007-09-24 | 2010-11-03 | 哈尔滨工业大学 | Complete solid-state beam current type reinforcing steel corrosion monitoring sensor and method for producing the same |
DE102008050478A1 (en) * | 2008-10-04 | 2010-04-29 | Selfsan Consult Gmbh | Measuring device for monitoring the corrosion of a steel reinforcement |
US8466695B2 (en) * | 2010-08-19 | 2013-06-18 | Southwest Research Institute | Corrosion monitoring of concrete reinforcement bars (or other buried corrodable structures) using distributed node electrodes |
CH706052A2 (en) * | 2012-01-20 | 2013-07-31 | Basys Ag | Integrated monitoring element. |
US20130280044A1 (en) * | 2012-04-20 | 2013-10-24 | General Electric Company | Corrosion monitoring device |
JP6941009B2 (en) * | 2017-08-31 | 2021-09-29 | 太平洋セメント株式会社 | Corrosion sensor |
KR102019276B1 (en) * | 2017-09-12 | 2019-09-11 | 경북대학교 산학협력단 | Concrete Segregation Measuring Device |
JP7104326B2 (en) * | 2018-09-27 | 2022-07-21 | 日本電信電話株式会社 | Corrosion assessment device and its method |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2947679A (en) * | 1956-12-24 | 1960-08-02 | Pure Oil Co | Corrosion rate sensing assembly |
US3772178A (en) * | 1968-10-03 | 1973-11-13 | Petrolite Corp | Electrode for corrosion test |
US3599090A (en) * | 1969-06-30 | 1971-08-10 | Us Interior | Apparatus for detecting and measuring crevice corrosion |
US3633099A (en) * | 1969-06-30 | 1972-01-04 | Us Interior | Process and apparatus for determining crevice corrosion by polarization techniques |
US3924175A (en) * | 1974-02-28 | 1975-12-02 | Petrolite Corp | D.C. system for conductivity measurements |
US3910830A (en) * | 1974-04-08 | 1975-10-07 | Petrolite Corp | Flush mounted probe assembly |
US3948744A (en) * | 1975-01-02 | 1976-04-06 | Northern Natural Gas Company | Flush mounted corrosion electrode |
US3980542A (en) * | 1975-07-14 | 1976-09-14 | Petrolite Corporation | Flush mounted probe for corrosion testing |
US4002806A (en) * | 1975-08-20 | 1977-01-11 | Ford Motor Company | Secondary battery or cell |
US4019133A (en) * | 1975-12-29 | 1977-04-19 | Gulf Research & Development Company | Corrosion detecting and monitoring apparatus |
US4109941A (en) * | 1976-06-08 | 1978-08-29 | Phillips Petroleum Company | Coupling for plastic pipe |
US4454006A (en) * | 1982-07-23 | 1984-06-12 | Petrolite Corporation | Method and apparatus for measuring total corrosion rate |
JPS63163266A (en) | 1986-12-26 | 1988-07-06 | Nippon Steel Corp | Corrosion detecting end of steel products in concrete and method for evaluating corrosion of steel products using said end |
GB8722088D0 (en) * | 1987-09-19 | 1987-10-28 | Manchester Inst Science Tech | Surface mounting corrosion probe |
DE3834628A1 (en) * | 1988-10-11 | 1990-04-12 | Peter Dr Ing Schiessl | CORROSION MEASURING CELL |
-
1997
- 1997-02-19 DE DE19706510A patent/DE19706510C1/en not_active Expired - Fee Related
-
1998
- 1998-02-10 CA CA002282304A patent/CA2282304A1/en not_active Abandoned
- 1998-02-10 KR KR1019997007548A patent/KR20000075489A/en not_active Application Discontinuation
- 1998-02-10 AU AU62964/98A patent/AU6296498A/en not_active Abandoned
- 1998-02-10 EP EP98906943A patent/EP0961927A1/en not_active Withdrawn
- 1998-02-10 JP JP53621698A patent/JP3742934B2/en not_active Expired - Fee Related
- 1998-02-10 US US09/367,986 patent/US6281671B1/en not_active Expired - Fee Related
- 1998-02-10 WO PCT/EP1998/000728 patent/WO1998037403A1/en not_active Application Discontinuation
-
1999
- 1999-08-18 NO NO993975A patent/NO993975L/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9837403A1 * |
Also Published As
Publication number | Publication date |
---|---|
US6281671B1 (en) | 2001-08-28 |
NO993975D0 (en) | 1999-08-18 |
CA2282304A1 (en) | 1998-08-27 |
JP2001513881A (en) | 2001-09-04 |
DE19706510C1 (en) | 1998-06-10 |
WO1998037403A1 (en) | 1998-08-27 |
KR20000075489A (en) | 2000-12-15 |
NO993975L (en) | 1999-08-18 |
JP3742934B2 (en) | 2006-02-08 |
AU6296498A (en) | 1998-09-09 |
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