FR2558596A1 - Detecting cracks in concrete and related materials - Google Patents
Detecting cracks in concrete and related materials Download PDFInfo
- Publication number
- FR2558596A1 FR2558596A1 FR8501073A FR8501073A FR2558596A1 FR 2558596 A1 FR2558596 A1 FR 2558596A1 FR 8501073 A FR8501073 A FR 8501073A FR 8501073 A FR8501073 A FR 8501073A FR 2558596 A1 FR2558596 A1 FR 2558596A1
- Authority
- FR
- France
- Prior art keywords
- substance
- liquid
- crack
- absorbed
- concrete
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 9
- 239000004567 concrete Substances 0.000 title claims description 7
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 230000005855 radiation Effects 0.000 claims abstract description 5
- 239000000941 radioactive substance Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 239000004566 building material Substances 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 claims description 2
- 238000001956 neutron scattering Methods 0.000 claims description 2
- 230000002285 radioactive effect Effects 0.000 abstract 1
- 239000000700 radioactive tracer Substances 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000002604 ultrasonography Methods 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
- 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
- G01N33/383—Concrete or cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
Landscapes
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
Description
Procédé pour repérer des fissures dans des bétons et. matériaux apparentés.Method for locating cracks in concrete and. related materials.
La présente invention se rapporte à un procédé pour repérer des fissures dans des bétons, des produits finis, des constructions composites et autres constructions. The present invention relates to a method for locating cracks in concrete, finished products, composite constructions and other constructions.
Il est connu que des fissures dans du béton peuvent être repérées par le procédé utilisant des ultrasons. A cette fin, on mesure la durée de transit d'une impulsion ultrasonique à travers le corps examiné. Les fissures interdisent la propagation du son et sont attestées par l'absence du signal de réception, ou bien par une durée de transit prolongée. L'inconvénient de ce procédé réside dans le fait que les éléments emetteur et récepteur du dispositif de mesure doivent être installés sur des côtés opposés du corps examiné, ce qui, dans le cas d'ouvrages de construction, ne peut parfois pas être réalisé. De plus, le procédé aux ultrasons s'avère déficient lorsque des produits finis se composent de couches de matériaux différents. It is known that cracks in concrete can be identified by the process using ultrasound. To this end, the duration of transit of an ultrasonic pulse through the body examined is measured. Cracks prohibit the propagation of sound and are evidenced by the absence of the reception signal, or by an extended transit time. The disadvantage of this method is that the transmitter and receiver elements of the measuring device have to be installed on opposite sides of the body being examined, which in the case of construction works can sometimes not be achieved. In addition, the ultrasonic process is found to be deficient when finished products are made up of layers of different materials.
L'invention a pour but de repérer le plus tôt possible des fissures en cours de formation, et d'observer l'allure de la propagation de ces fissures. The object of the invention is to identify cracks as soon as possible during formation, and to observe the rate of propagation of these cracks.
L'objet de l'invention consiste à élaborer un procédé pour detecter des fissures, même en condition dtincorpora- tion. Ce procédé doit également pouvoir être appliqué lorsque l'objet contrôlé n'est accessible que d'un côté. The object of the invention is to develop a method for detecting cracks, even under incorporation conditions. This process must also be able to be applied when the controlled object is only accessible from one side.
Conformément à l'invention, ce but est atteint par le fait qu'un liquide, renfermant ou non une substance révélatrice pouvant être repérée, est amené au contact d'une zone déterminée de l'élément de construction. Cette mise en contact peut être assurée par une introduction directe du liquide dans la fissure, lorsque l'amorce de cette fissure est visible et accessible. Le liquide peut aussi être introduit par des perçages qui sont commodément pratiqués, et sont en communication avec la sortie d'un récipient empli par ce liquide. Lors de la détection d'une fissure, cette-dernière s'emplit de liquide et peut être repérée de l'extérieur d'une manière appropriée. Si cela s'avère nécessaire, le liquide peut également être introduit sous pression. According to the invention, this object is achieved by the fact that a liquid, containing or not containing a detectable substance, is brought into contact with a determined zone of the building element. This contacting can be ensured by direct introduction of the liquid into the crack, when the initiation of this crack is visible and accessible. The liquid can also be introduced through holes which are conveniently made, and are in communication with the outlet of a container filled with this liquid. When a crack is detected, it fills with liquid and can be spotted from the outside in a suitable way. If necessary, the liquid can also be introduced under pressure.
L'invention va, à présent, être expliquée plus en détail à l'appui de deux exemples de réalisation. The invention will now be explained in more detail with the aid of two exemplary embodiments.
1. La présence de fissures superficielles est subodorée dans un élément de paroi à plusieurs couches. Cet élément de paroi n'est accessible que d'un côté. La position des fissures est établie comme suit : si ltélément de paroi n'est accessible que de l'intérieur, des perçages sont ménagés jusqu'à l'enduit externe. Ces perçages sont reliés à un récipient renfermant le liquide de repérage. Dans ce cas particulier, on utilise un radioélément dont on sait qu'il est absorbé par le béton et par le matériau d'isolation. La substance est dissoute dans le liquide. La répartition mesurable du radioélément indique le trajet parcouru par le liquide de repérage à travers les fissures, ce radioélément pouvant être bien repéré de l'extérieur au moyen de détecteurs de rayonnements ou d'un film. 1. The presence of surface cracks is suspected in a multi-layer wall element. This wall element is only accessible from one side. The position of the cracks is established as follows: if the wall element is only accessible from the inside, holes are made up to the external plaster. These holes are connected to a container containing the locating liquid. In this particular case, a radioelement is used which is known to be absorbed by the concrete and by the insulation material. The substance is dissolved in the liquid. The measurable distribution of the radioelement indicates the path traveled by the locating liquid through the cracks, this radioelement can be well located from the outside by means of radiation detectors or a film.
2. L'objectif recherché étant le même, on utilise, en tant que liquide révélateur, la solution aqueuse de deux radioéléments dont i'un est absorbé par le béton, mais pas l'autre. La répartition du premier radioélément indique Si des fissures sont présentes, celle du second radioélément révèle en plus les régions dans lesquelles l'eau s'est diffusée dans le matériau de construction. La différence entre les profils d'activité permet de tirer des conséquences au sujet de la forme et de l'ampleur des fissures. 2. The objective being the same, the aqueous solution of two radioelements, one of which is absorbed by the concrete, but not the other, is used as the revealing liquid. The distribution of the first radio element indicates If cracks are present, that of the second radio element also reveals the regions in which water has diffused into the building material. The difference between the activity profiles makes it possible to draw conclusions about the shape and extent of the cracks.
La substance radioactive peut être utilisée pour une série de mesures d'étalonnage et, en présence de matériaux identiques, il peut être renoncé au radio-indicateur
La substance révélatrice peut renfermer des composants de B etZou de Li, et l'allure des fissures peut être mise en évidence par des mesures par absorption de neutrons ou, respectivement, par des expériences par diffusion de neutrons.The radioactive substance can be used for a series of calibration measurements and, in the presence of identical materials, it can be omitted from the radio-indicator
The developer can contain components of B and Z or Li, and the appearance of cracks can be demonstrated by neutron absorption measurements or, respectively, by neutron scattering experiments.
La distance séparant la face supérieure et la fissure peut être déterminée d'après la variation de la crête d'énergie du radio- indicateur, en fonction de l'épaisseur de matière traversée par les rayonnements. The distance between the upper face and the crack can be determined according to the variation of the energy peak of the radio-indicator, as a function of the thickness of material crossed by the radiations.
La substance absorbée peut etre un radio-isotope de Na, de K, de Ba, de Sr ou de Rb, la substance non absorbée pouvant entre un radio-isotope de Br, de J de C1 ou de Tc. The absorbed substance can be a radioisotope of Na, K, Ba, Sr or Rb, the nonabsorbed substance being able between a radioisotope of Br, J of C1 or Tc.
Il va de soi que de nombreuses modifications peuvent être apportées au procédé décrit, sans sortir du cadre de l'invention. It goes without saying that numerous modifications can be made to the process described, without going beyond the ambit of the invention.
Claims (7)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD25958084A DD233761A3 (en) | 1984-01-25 | 1984-01-25 | METHOD FOR DETERMINING CRACKS IN CONCRETE AND RELATED MATERIALS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2558596A1 true FR2558596A1 (en) | 1985-07-26 |
Family
ID=5554286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8501073A Pending FR2558596A1 (en) | 1984-01-25 | 1985-01-25 | Detecting cracks in concrete and related materials |
Country Status (6)
| Country | Link |
|---|---|
| AT (1) | ATA373884A (en) |
| BG (1) | BG45966A1 (en) |
| CS (1) | CS266370B1 (en) |
| DD (1) | DD233761A3 (en) |
| DE (1) | DE3442544A1 (en) |
| FR (1) | FR2558596A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093199B (en) * | 2006-06-23 | 2010-12-29 | 东南大学 | Method for non-destructive testing grouting cavernes in prestressed concrete structure |
| CN101713727B (en) * | 2009-12-29 | 2012-05-23 | 江苏省电力试验研究院有限公司 | In-service transformer-station concrete component load-bearing safety detection device and detection method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3823220A1 (en) * | 1988-07-08 | 1990-01-11 | Boris V Dipl Ing Drachenfels | Method for the location of hollow spaces or the like in concrete structures and concrete prefabrications, especially in prestressed concrete structures |
| US9651447B1 (en) * | 2016-03-06 | 2017-05-16 | The Boeing Company | Radiographic method and apparatus for detection of cracks, defects, or leak pathways in materials and assemblies |
| CN108828199A (en) * | 2018-06-13 | 2018-11-16 | 陕西红柠铁路有限责任公司 | A method of concrete cracks are monitored using glass bar |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB992972A (en) * | 1962-02-26 | 1965-05-26 | Cons Electrodynamics Corp | Method for testing the penetration of matter into bodies |
| US4172224A (en) * | 1978-10-24 | 1979-10-23 | The United States Of America As Represented By The United States Department Of Energy | Process for the detection of micro-cracks |
| US4317996A (en) * | 1980-01-14 | 1982-03-02 | R. E. Davis Chemical Corporation | Methods for detection of roof leaks and areas or zones of the leakage |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3621252A (en) * | 1969-11-28 | 1971-11-16 | Industrial Nucleonics Corp | Process and apparatus for defect detection using a radioactive isotope |
-
1984
- 1984-01-25 DD DD25958084A patent/DD233761A3/en not_active IP Right Cessation
- 1984-11-22 DE DE19843442544 patent/DE3442544A1/en active Granted
- 1984-11-26 AT AT373884A patent/ATA373884A/en not_active Application Discontinuation
- 1984-12-20 CS CS8410050A patent/CS266370B1/en unknown
- 1984-12-24 BG BG6805784A patent/BG45966A1/en unknown
-
1985
- 1985-01-25 FR FR8501073A patent/FR2558596A1/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB992972A (en) * | 1962-02-26 | 1965-05-26 | Cons Electrodynamics Corp | Method for testing the penetration of matter into bodies |
| US4172224A (en) * | 1978-10-24 | 1979-10-23 | The United States Of America As Represented By The United States Department Of Energy | Process for the detection of micro-cracks |
| US4317996A (en) * | 1980-01-14 | 1982-03-02 | R. E. Davis Chemical Corporation | Methods for detection of roof leaks and areas or zones of the leakage |
Non-Patent Citations (1)
| Title |
|---|
| ISOTOPES AND RADIATION TECHNOLOGY, vol. 6, no. 1, 1968, pages 70-76; R. GREENE: "Tracing with activable tracers: part II" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101093199B (en) * | 2006-06-23 | 2010-12-29 | 东南大学 | Method for non-destructive testing grouting cavernes in prestressed concrete structure |
| CN101713727B (en) * | 2009-12-29 | 2012-05-23 | 江苏省电力试验研究院有限公司 | In-service transformer-station concrete component load-bearing safety detection device and detection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CS266370B1 (en) | 1989-12-13 |
| CS1005084A1 (en) | 1988-08-16 |
| ATA373884A (en) | 1995-05-15 |
| DD233761A3 (en) | 1986-03-12 |
| BG45966A1 (en) | 1989-09-15 |
| DE3442544C2 (en) | 1989-06-08 |
| DE3442544A1 (en) | 1985-07-25 |
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