CN1401989A - Method for infrared thermal image detecting concrete structure damage, and machine-sensitive concrete therefor - Google Patents
Method for infrared thermal image detecting concrete structure damage, and machine-sensitive concrete therefor Download PDFInfo
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- CN1401989A CN1401989A CN 02139072 CN02139072A CN1401989A CN 1401989 A CN1401989 A CN 1401989A CN 02139072 CN02139072 CN 02139072 CN 02139072 A CN02139072 A CN 02139072A CN 1401989 A CN1401989 A CN 1401989A
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- concrete
- xoncrete structure
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Abstract
A method for using force sensitive concrete to detect the damage of concrete structure by infrared thermal imaging system includes preparing force sensitive concrete from short carbon fibres, additive, cement, sand and aggregate, uniformly dispersing the short carbon fibres in it, burying electrodes, connecting low-voltage power supply, and detecting. Its advantages are high correctness, no damage to concrete structure, and no influence of environment.
Description
Technical field
The present invention relates to a kind of method of xoncrete structure Non-Destructive Testing, relate to method and the used sensitive concrete of this detection method that a kind of xoncrete structure damage infrared thermal imagery detects concretely.
Background technology
Concrete is a most widely used structured material in the civil engineering work, xoncrete structure is except that being subjected to extraneous load influence, also be faced with harm such as steel bar corrosion, freeze injury, erosion, cause the damage accumulation and the drag decay of structure and system inevitably, thereby resist the ability drop of disaster even cause catastrophic burst accident.And the operating period of Important Project structure and life line system reaches decades even go up century-old, some Important Project also relates to the economic lifeline of country, therefore, the Gernral Check-up of great civil engineering structure and infrastructure has become the important subject of field of civil engineering.
The method that the infrared thermal imagery of xoncrete structure damage at present detects generally has: adopt outer thermal source to heat, utilize structure burnt or heat after waste heat, or in xoncrete structure, imbed lectrothermal alloy wire etc.Adopt external heat source to can be used for the assessment of structure sample performance, but detection faces is extremely limited,, then can't detects at opaco and cloudy day as with the sunshine heating; And will cause new infringement to structure because the heating-up temperature of some method is higher; Employing is imbedded lectrothermal alloy wire and can be detected its position, place local damage, but can not detect other position and one-piece construction.
Summary of the invention
In order to overcome the problems referred to above, the object of the present invention is to provide the method for a kind of xoncrete structure damage infrared thermal imagery detection and be used to detect used sensitive concrete, it detects and accurately, comprehensively, does not damage xoncrete structure, simple to operate.
1), make sensitive concrete technical scheme of the present invention is: the method that xoncrete structure damage infrared thermal imagery detects is characterized in that realizing by following step:: chopped carbon fiber, adjuvant, cement, sand, aggregate are the carbon fiber reinforced concrete (being called sensitive concrete) that main raw material(s) is made; 2), chopped carbon fiber is dispersed in the xoncrete structure; 3), bury electrode underground, the connection low-tension supply in the sensitive concrete; 4), with thermal infrared imager concrete structural surface being carried out infrared thermal imagery detects.
Described low-tension supply is direct current or alternating current.
Described sensitive concrete has the resistivity of 2-200 Ω .m.
Described xoncrete structure all is made up of sensitive concrete.
Described xoncrete structure part is made up of sensitive concrete.
The sensitive concrete that the method for above-mentioned detection is used comprises cement, sand, aggregate, it is characterized in that also adding chopped carbon fiber, adjuvant.
Described chopped carbon fiber is evenly distributed in the xoncrete structure.
Described adjuvant is the E-methylcellulose.
It is that carbon fiber is dispersed in the xoncrete structure that the present invention adopts sensitive concrete, make its sensitive concrete material have the resistivity of 2-200 Ω .m, use for connecting power supply according to the multi-form corresponding electrode that is provided with of structure, make it have the electrocaloric effect of good homogeneous; After structure is connected safe low-tension supply, because the electrocaloric effect of carbon fiber reinforced concrete (sensitive concrete), the temperature of structure will slightly raise; When structure exists defective or crackle since near this defective or crackle or the current density of tip region increase, sensitive concrete near this defective or crackle or the temperature of tip region have obviously and increase; Adopt the thermal infrared imager experiment Analysis then, can obtain the concrete cracks defect hot as analysis chart.Thereby judge the size and location of in structure defective or crackle.
The present invention is owing to utilized the electrocaloric effect of sensitive concrete, the heating of employing low-voltage, its structural entity temperature only raises the several years (caning be controlled in 3 ℃) and temperature in its crack tip zone can raise in 20 remaining scopes Celsius, thereby structure is not had any additional injury when detecting; Can can't harm the whole audience to xoncrete structure and detect, and intuitive and reliable, convenient and swift.
Description of drawings
Fig. 1 is the Infrared Thermogram that the present invention contains the carbon fiber reinforced concrete of precrack.
Embodiment
The method that xoncrete structure damage infrared thermal imagery detects, 1), make sensitive concrete realize by following step:: chopped carbon fiber, adjuvant, cement, sand, aggregate are the carbon fiber reinforced concrete (being called sensitive concrete) of main raw material(s) making; 2), chopped carbon fiber is dispersed in the xoncrete structure; 3), bury electrode underground, the connection low-tension supply in the sensitive concrete; 4), with thermal infrared imager concrete structural surface being carried out infrared thermal imagery detects.
Described low-tension supply is direct current or alternating current.
Described sensitive concrete has the resistivity of 2-200 Ω .m.
Described xoncrete structure all is made up of sensitive concrete.
Described xoncrete structure part is made up of sensitive concrete.
The sensitive concrete that the method for above-mentioned detection is used comprises cement, sand, aggregate, also adds chopped carbon fiber, adjuvant.
Described chopped carbon fiber is evenly distributed in the xoncrete structure.
Described adjuvant is the E-methylcellulose.
Claims (8)
1), make sensitive concrete 1, the method that detects of xoncrete structure damage infrared thermal imagery is characterized in that realizing by following step:: chopped carbon fiber, adjuvant, cement, sand, aggregate are the carbon fiber reinforced concrete that main raw material(s) is made; 2), chopped carbon fiber is dispersed in the xoncrete structure; 3), bury electrode underground, the connection low-tension supply in the sensitive concrete; 4), with thermal infrared imager concrete structural surface being carried out infrared thermal imagery detects.
2, the method for xoncrete structure damage infrared thermal imagery according to claim 1 detection is characterized in that described low-tension supply is direct current or alternating current.
3, the method for xoncrete structure damage infrared thermal imagery according to claim 1 detection is characterized in that described sensitive concrete has the resistivity of 2-200 Ω .m.
4, the method that detects of xoncrete structure according to claim 1 damage infrared thermal imagery is characterized in that described xoncrete structure can all be made up of sensitive concrete.
5, the method that detects of xoncrete structure according to claim 1 damage infrared thermal imagery is characterized in that described xoncrete structure can part be made up of sensitive concrete.
6, the used sensitive concrete of method of xoncrete structure damage infrared thermal imagery detection comprises cement, sand, aggregate, it is characterized in that adding chopped carbon fiber, adjuvant.
7, sensitive concrete according to claim 6 is characterized in that described chopped carbon fiber is evenly distributed in the xoncrete structure.
8, sensitive concrete according to claim 6 is characterized in that described adjuvant is the E-methylcellulose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139072 CN1401989A (en) | 2002-09-20 | 2002-09-20 | Method for infrared thermal image detecting concrete structure damage, and machine-sensitive concrete therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02139072 CN1401989A (en) | 2002-09-20 | 2002-09-20 | Method for infrared thermal image detecting concrete structure damage, and machine-sensitive concrete therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1401989A true CN1401989A (en) | 2003-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02139072 Pending CN1401989A (en) | 2002-09-20 | 2002-09-20 | Method for infrared thermal image detecting concrete structure damage, and machine-sensitive concrete therefor |
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| CN (1) | CN1401989A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808760A (en) * | 2013-12-12 | 2014-05-21 | 交通运输部公路科学研究所 | Thermal excitation device for infrared thermal imaging nondestructive detection on concrete structure |
-
2002
- 2002-09-20 CN CN 02139072 patent/CN1401989A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103808760A (en) * | 2013-12-12 | 2014-05-21 | 交通运输部公路科学研究所 | Thermal excitation device for infrared thermal imaging nondestructive detection on concrete structure |
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