FR2423776A1 - Crack detector for concrete submerged in sea - has sensing electrodes connected via multiplexer to detector and demodulator - Google Patents

Crack detector for concrete submerged in sea - has sensing electrodes connected via multiplexer to detector and demodulator

Info

Publication number
FR2423776A1
FR2423776A1 FR7811545A FR7811545A FR2423776A1 FR 2423776 A1 FR2423776 A1 FR 2423776A1 FR 7811545 A FR7811545 A FR 7811545A FR 7811545 A FR7811545 A FR 7811545A FR 2423776 A1 FR2423776 A1 FR 2423776A1
Authority
FR
France
Prior art keywords
detector
crack
demodulator
sea
electrode
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.)
Granted
Application number
FR7811545A
Other languages
French (fr)
Other versions
FR2423776B1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EXPER RECH ETU BATIMENT CENTRE
Original Assignee
EXPER RECH ETU BATIMENT CENTRE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EXPER RECH ETU BATIMENT CENTRE filed Critical EXPER RECH ETU BATIMENT CENTRE
Priority to FR7811545A priority Critical patent/FR2423776A1/en
Publication of FR2423776A1 publication Critical patent/FR2423776A1/en
Application granted granted Critical
Publication of FR2423776B1 publication Critical patent/FR2423776B1/fr
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/20—Investigating the presence of flaws
    • G01N27/205—Investigating the presence of flaws in insulating materials
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Ecology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Environmental Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

The reinforced concrete submerged in sea water is automatically examined for cracks by detector which senses modification to electric current or voltage density around the crack. An alternating current source is connected to a reinforcing core of concrete while second electrode is connected to an electrode plate comprising insulating panel with series of electrode elements on a conducting face. Electrodes connect via a multiplexer to a detector and a demodulator senses individual electrode current for observation on oscilloscope synchronised with the multiplexer. Observed signal peaks indicate the position of a crack.
FR7811545A 1978-04-19 1978-04-19 Crack detector for concrete submerged in sea - has sensing electrodes connected via multiplexer to detector and demodulator Granted FR2423776A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7811545A FR2423776A1 (en) 1978-04-19 1978-04-19 Crack detector for concrete submerged in sea - has sensing electrodes connected via multiplexer to detector and demodulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7811545A FR2423776A1 (en) 1978-04-19 1978-04-19 Crack detector for concrete submerged in sea - has sensing electrodes connected via multiplexer to detector and demodulator

Publications (2)

Publication Number Publication Date
FR2423776A1 true FR2423776A1 (en) 1979-11-16
FR2423776B1 FR2423776B1 (en) 1983-08-05

Family

ID=9207332

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7811545A Granted FR2423776A1 (en) 1978-04-19 1978-04-19 Crack detector for concrete submerged in sea - has sensing electrodes connected via multiplexer to detector and demodulator

Country Status (1)

Country Link
FR (1) FR2423776A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3600034A1 (en) * 1986-01-03 1987-07-09 Franke Lutz Dr Ing METHOD FOR DETERMINING MECHANICAL DEFECTS ON COMPONENTS MADE OF COMPOSITE FIBER MATERIAL, APPLICATION OF THE METHOD AND MEASURING DEVICE AND REINFORCEMENT BAR FOR IMPLEMENTING THE METHOD
EP0241440A2 (en) * 1986-02-19 1987-10-14 BAC Bergsöe Anti Corrosion AB Control system for electrochemical protection on submersible metal structures
US5032794A (en) * 1989-05-08 1991-07-16 James Cook University Of Northern Queensland Method and apparatus for monitoring changes in underwater sediment levels
EP0454581A1 (en) * 1990-04-26 1991-10-30 Etat Francais Represente Par Le Laboratoire Central Des Ponts Et Chaussees Device for measuring the electrode potential of metallic reinforcement in immersed concrete
WO2000046593A2 (en) * 1999-02-08 2000-08-10 Analatom Incorporated A micro-electronic bond degradation sensor and method of manufacture

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210655A (en) * 1960-08-29 1965-10-05 Continental Oil Co Electrolyte method and apparatus for detecting holidays in the internal coatings of pipes
US3405356A (en) * 1966-12-09 1968-10-08 Texaco Inc System including two pairs of voltage electrodes for detecting discontinuities in insulation coatings on conductive conduit
US4056446A (en) * 1977-01-03 1977-11-01 Continental Oil Company Diverless cathodic protection data acquisition
US4078510A (en) * 1976-01-12 1978-03-14 Morgan Berkeley & Co. Ltd. Relating to the cathodic protection of structures

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3210655A (en) * 1960-08-29 1965-10-05 Continental Oil Co Electrolyte method and apparatus for detecting holidays in the internal coatings of pipes
US3405356A (en) * 1966-12-09 1968-10-08 Texaco Inc System including two pairs of voltage electrodes for detecting discontinuities in insulation coatings on conductive conduit
US4078510A (en) * 1976-01-12 1978-03-14 Morgan Berkeley & Co. Ltd. Relating to the cathodic protection of structures
US4056446A (en) * 1977-01-03 1977-11-01 Continental Oil Company Diverless cathodic protection data acquisition

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EXBK/68 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3600034A1 (en) * 1986-01-03 1987-07-09 Franke Lutz Dr Ing METHOD FOR DETERMINING MECHANICAL DEFECTS ON COMPONENTS MADE OF COMPOSITE FIBER MATERIAL, APPLICATION OF THE METHOD AND MEASURING DEVICE AND REINFORCEMENT BAR FOR IMPLEMENTING THE METHOD
EP0241440A2 (en) * 1986-02-19 1987-10-14 BAC Bergsöe Anti Corrosion AB Control system for electrochemical protection on submersible metal structures
EP0241440A3 (en) * 1986-02-19 1989-07-19 Gosta Lange Control system for electrochemical protection on submersible metal structures
US5032794A (en) * 1989-05-08 1991-07-16 James Cook University Of Northern Queensland Method and apparatus for monitoring changes in underwater sediment levels
EP0454581A1 (en) * 1990-04-26 1991-10-30 Etat Francais Represente Par Le Laboratoire Central Des Ponts Et Chaussees Device for measuring the electrode potential of metallic reinforcement in immersed concrete
FR2661503A1 (en) * 1990-04-26 1991-10-31 France Etat Ponts Chaussees DEVICE FOR MEASURING THE ELECTRODE POTENTIAL OF THE REINFORCEMENT OF UNDERWATER CONCRETE.
WO2000046593A2 (en) * 1999-02-08 2000-08-10 Analatom Incorporated A micro-electronic bond degradation sensor and method of manufacture
WO2000046593A3 (en) * 1999-02-08 2000-12-14 Analatom Inc A micro-electronic bond degradation sensor and method of manufacture
US6384610B1 (en) 1999-02-08 2002-05-07 The Commonwealth Of Australia Micro-electronic bond degradation sensor and method of manufacture
US6693417B2 (en) 1999-02-08 2004-02-17 Commonwealth Of Australia Micro-electronic bond degradation sensor and method of manufacture

Also Published As

Publication number Publication date
FR2423776B1 (en) 1983-08-05

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