CN203858214U - Device for simulating crack propagation form of airfield pavement - Google Patents
Device for simulating crack propagation form of airfield pavement Download PDFInfo
- Publication number
- CN203858214U CN203858214U CN201420238396.9U CN201420238396U CN203858214U CN 203858214 U CN203858214 U CN 203858214U CN 201420238396 U CN201420238396 U CN 201420238396U CN 203858214 U CN203858214 U CN 203858214U
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- concrete
- cutting edge
- retracting
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- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000010949 copper Substances 0.000 claims abstract description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 22
- 238000005336 cracking Methods 0.000 abstract description 13
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 11
- 239000004917 carbon fiber Substances 0.000 abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 11
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000005520 cutting process Methods 0.000 abstract description 5
- 230000006698 induction Effects 0.000 abstract description 5
- 238000005485 electric heating Methods 0.000 abstract description 3
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract 1
- 239000011150 reinforced concrete Substances 0.000 description 8
- 238000004088 simulation Methods 0.000 description 7
- 239000012141 concentrate Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The utility model discloses a device for simulating a crack propagation form of an airfield pavement. The device comprises restrained ends and retracting ends which are arranged at the two ends of the device, and copper plate electrodes which are arranged at the retracting ends, wherein the retracting ends are connected with the middle parts of the restrained ends; a movable cutting edge is arranged between the two retracting ends; a separation thin sheet is arranged at one end of the movable cutting edge. According to the device for simulating the crack propagation form of the airfield pavement disclosed by the utility model, the sections of the retracting ends are reduced and the middle cutting edge is arranged so that cracking induction can be effectively carried out on carbon fiber concrete, restraint is provided on a concrete test piece at the end part, and furthermore, the concrete test piece is cracked; the length, the depth and the width of cracks are quantified through the fine tuning of the metal thin sheet and the movable cutting edge, and the influences on snow melting and deicing electric heating performance of cracks of the carbon fiber concrete airfield pavement can be quantificationally analyzed.
Description
Technical field
The utility model relates to a kind of concrete electric heat performance testing device, relates in particular to a kind of for simulating the device of the crack propagation form of carbon fiber reinforced concrete airfield pavement.
Background technology
Dumbbell shape airport pavement concrete cracking performance method of testing and device, the method can be assessed fast and accurately at airport engineering scene extended mode and the development trend of the early stage cracking of concrete, can contrast crack-resistant performance of concrete simultaneously, by average crack width and incipient crack time two indexs, the concrete cracking resistance of quantitatively evaluating, evaluates and method of testing fast and accurately for concrete cracking resistance provides simply and rapidly.
As shown in Figure 1, stress generator top A, A ' point exists stress to concentrate, and belongs to most dangerous point.Under the induction and end restraint of stress generator, the crack of test specimen is single track crack, and trend runs through A-A ', so just can make gap observation and DATA REASONING more convenient.
This method of testing can only produce crack in assigned address induction with device, but the length in crack, the degree of depth, width cannot be done to quantize, and still can not analyze quantitatively carbon fiber reinforced concrete airfield pavement crack to its deicing or snow melting electric heating property impact.
Utility model content
The purpose of this utility model provides a kind of for simulating the device of the crack propagation form of carbon fiber reinforced concrete airfield pavement with regard to being in order to address the above problem.
In order to achieve the above object, the utility model has adopted following technical scheme:
The device that is used for the crack propagation form of virtual airport road face, comprise and be arranged on restrained end, the serrated end at described device two ends and be arranged on the copper coin electrode on described serrated end, described serrated end is connected with described restrained end middle part, between two described serrated ends, be provided with the movable edge of a knife, one end of the described movable edge of a knife is provided with partition thin slice.
By the cross section of serrated end being reduced and setting to the middle part edge of a knife, carbon fiber reinforced concrete is implemented to effectively cracking induction, and to concrete sample, provide constraint in end, make concrete sample produce cracking.
The beneficial effects of the utility model are:
The utility model is the device for the crack propagation form of virtual airport road face, by the cross section of serrated end being reduced and setting to the middle part edge of a knife, carbon fiber reinforced concrete is implemented to effectively cracking induction, and to concrete sample, provide constraint in end, make concrete sample produce cracking, fine adjustment by sheet metal and the movable edge of a knife has realized to be done the length in crack, the degree of depth, width to quantize, and can analyze quantitatively carbon fiber reinforced concrete airfield pavement crack to its deicing or snow melting electric heating property impact.
Accompanying drawing explanation
Fig. 1 is force analysis figure when concrete sample shrinks under constraint condition;
Fig. 2 is that the utility model carries out the penetration of fracture vertical view in when simulation;
Fig. 3 is that the utility model carries out the penetration of fracture side view in when simulation;
Fig. 4 is that the utility model carries out the fracture length vertical view in when simulation;
Fig. 5 is that the utility model carries out the fracture length side view in when simulation;
Fig. 6 is the front view of the described movable edge of a knife in the utility model;
Fig. 7 is the test pattern of the described movable edge of a knife in the utility model;
Fig. 8 is the rear view of the described movable edge of a knife in the utility model;
Fig. 9 is the schematic perspective view of the described movable edge of a knife in the utility model;
Figure 10 is principle of work schematic diagram of the present utility model;
Figure 11 is further work principle schematic of the present utility model.
In figure: 1-restrained end, 2-serrated end, 3-copper coin electrode, the movable edge of a knife of 4-, 5-cuts off thin slice.
Embodiment
Below in conjunction with instantiation, the utility model is described in further detail:
Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described, in illustrative examples and the explanation of this utility model, is used for explaining the utility model, but not as to restriction of the present utility model.
As shown in Fig. 2 to Fig. 9, the utility model is the device for the crack propagation form of virtual airport road face, comprise and be arranged on restrained end 1, the serrated end 2 at device two ends and be arranged on the copper coin electrode 3 on serrated end 2, serrated end 2 is connected with restrained end 1 middle part, between two serrated ends 2, be provided with the movable edge of a knife 4, one end of the movable edge of a knife 4 is provided with and cuts off thin slice 5.
As shown in figure 10, after concreting, under dry environment, produce and shrink, under contraction power, A point one side, produces reacting force F1 and F2 to concrete sample respectively on serrated end 2 surfaces, and direction is all perpendicular to surface.
What A was ordered stressedly decomposes according to mechanics triangle:
As shown in figure 11, when concrete material shrinks, the concrete at A point place, stress generator top, shrinking under the acting force producing, is subject to horizontal force F1x and F2x that left and right both direction is contrary.And the F1y of vertical direction and the effect of F2y, therefore exist stress to concentrate at serrated end 2 with the A point place on edge of a knife summit, belong to most dangerous point.B point one side serrated end 2 surfaces are relatively mild, and the stress of generation is concentrated and is significantly less than A point.During concrete shrinkage, be subject to the constraint from serrated end 2 and die trial end, when differential contraction stress is greater than Concrete under Direct Tension, there is cracking in test specimen.Crack is expanded to B gradually by A.
Be fracture length simulation as shown in Figure 4 and Figure 5:
Measure suitable length, the vertical movable edge of a knife 4 directions are inserted the artificial axial crack of sheet metal manufacture, and discharge stress and concentrate, and with cutting off thin slice 5 barriers, and suitably reduce restrained end 1 width of B point one side, can accurately control along the length in edge of a knife direction crack.
Be penetration of fracture simulation as shown in Figures 2 and 3:
The movable edge of a knife 4 in middle part connects with side board by bolt, its position can be adjusted up and down, carbon fiber reinforced concrete shrinkage cracking extends to behind the movable edge of a knife 4 tops stress by test specimen surface and concentrates and discharged, the carbon fiber reinforced concrete of the movable edge of a knife below 4 do not produce crack, thereby make concrete integral thickness constant, and the change in depth in crack and controlled.
Fracture width simulation:
The cracking width of test specimen, relates to the unevenness of concrete itself, environment temperature, wind speed, the impact of the factors such as the dispersion situation of carbon fiber.The experiment of group more than cannot accomplishing test specimens exactly natural cracking arrive on all four width.Must adjust artificially.
After incipient crack generates, the width of first fracture is measured.As needed, adjust, can adopt the restrained end 1 of compact spiral jack pair one side of horizontal placement to carry out Slow loading, incipient crack is widened gradually, and with fracture width testing tool, accurately measured in this process.When crack mean breadth reaches design load, stop loading.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within being all included in protection domain of the present utility model.
Claims (1)
1. for the device of the crack propagation form of virtual airport road face, it is characterized in that: comprise and be arranged on restrained end, the serrated end at described device two ends and be arranged on the copper coin electrode on described serrated end, described serrated end is connected with described restrained end middle part, between two described serrated ends, be provided with the movable edge of a knife, one end of the described movable edge of a knife is provided with partition thin slice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420238396.9U CN203858214U (en) | 2014-05-12 | 2014-05-12 | Device for simulating crack propagation form of airfield pavement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420238396.9U CN203858214U (en) | 2014-05-12 | 2014-05-12 | Device for simulating crack propagation form of airfield pavement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203858214U true CN203858214U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420238396.9U Expired - Lifetime CN203858214U (en) | 2014-05-12 | 2014-05-12 | Device for simulating crack propagation form of airfield pavement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203858214U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954644A (en) * | 2014-05-12 | 2014-07-30 | 中国民航机场建设集团公司 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
| CN108828198A (en) * | 2018-06-12 | 2018-11-16 | 北京工业大学 | Early concrete crack-induced test device |
-
2014
- 2014-05-12 CN CN201420238396.9U patent/CN203858214U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103954644A (en) * | 2014-05-12 | 2014-07-30 | 中国民航机场建设集团公司 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
| CN108828198A (en) * | 2018-06-12 | 2018-11-16 | 北京工业大学 | Early concrete crack-induced test device |
| CN108828198B (en) * | 2018-06-12 | 2021-08-20 | 北京工业大学 | Early concrete crack induction testing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100101 No. 111 East Fourth Ring Road, Chaoyang District, Beijing Patentee after: CAAC Airport Construction Group Co.,Ltd. Address before: 100101 No. 111 East Fourth Ring Road, Chaoyang District, Beijing Patentee before: CHINA AIRPORT CONSTRUCTION Group Corp. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141001 |
|
| CX01 | Expiry of patent term |