CN103954644A - Device for simulating crack expanding form of carbon fiber concrete airfield pavement - Google Patents
Device for simulating crack expanding form of carbon fiber concrete airfield pavement Download PDFInfo
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- CN103954644A CN103954644A CN201410196359.0A CN201410196359A CN103954644A CN 103954644 A CN103954644 A CN 103954644A CN 201410196359 A CN201410196359 A CN 201410196359A CN 103954644 A CN103954644 A CN 103954644A
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- carbon fiber
- crack
- fiber concrete
- airfield pavement
- contraction
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Abstract
The invention discloses a device for simulating the crack expanding form of a carbon fiber concrete airfield pavement. The device comprises constraint ends, contraction ends and copper plate electrodes, wherein the constraint ends and the contraction ends are arranged at the two ends of the device; the copper plate electrodes are arranged at the contraction ends; the contraction ends are connected with the middle parts of the constraint ends; a movable tool edge is formed between the two contraction ends; an isolating slice is arranged at one end of the movable tool edge. According to the device for simulating the crack expanding form of the carbon fiber concrete airfield pavement, the sections of the contraction ends are reduced and the middle tool edge is formed, so that cracking of carbon fiber concrete is effectively induced. Moreover, a concrete test piece is constrained on end parts to crack. Through fine adjustment on the metal slice and the movable tool edge, quantification of the lengths, depths and widths of cracks is realized, and the influences of cracks of the carbon fiber concrete airfield pavement on the snow and ice melting electro-thermal performance of the pavement can be analyzed quantitatively.
Description
Technical field
The present invention relates to a kind of concrete electric heat performance testing device, relate in particular to a kind of for simulating the device of 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 simply and rapidly, evaluates and method of testing fast and accurately for concrete cracking resistance provides.
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.
Summary of the invention
It is a kind of for simulating the device of crack propagation form of carbon fiber reinforced concrete airfield pavement that object of the present invention is just to provide in order to address the above problem.
In order to achieve the above object, the present invention has adopted following technical scheme:
Be used for the device of the crack propagation form of simulating carbon fiber reinforced concrete airfield pavement, 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 provide constraint in end to concrete sample, make concrete sample produce cracking.
Beneficial effect of the present invention is:
The present invention is the device of the crack propagation form for simulating carbon fiber reinforced concrete airfield pavement, 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 provide constraint in end to concrete sample, make concrete sample produce cracking, realize the length in crack, the degree of depth, width are done to quantize by the fine adjustment of sheet metal and the movable edge of a knife, can analyze quantitatively carbon fiber reinforced concrete airfield pavement crack to its deicing or snow melting electric heating property impact.
Brief description of the drawings
Fig. 1 is force analysis figure when concrete sample shrinks under constraint condition;
Fig. 2 is that the present invention carries out the penetration of fracture vertical view in when simulation;
Fig. 3 is that the present invention carries out the penetration of fracture side view in when simulation;
Fig. 4 is that the present invention carries out the fracture length vertical view in when simulation;
Fig. 5 is that the present invention 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 present invention;
Fig. 7 is the test pattern of the described movable edge of a knife in the present invention;
Fig. 8 is the rear view of the described movable edge of a knife in the present invention;
Fig. 9 is the schematic perspective view of the described movable edge of a knife in the present invention;
Figure 10 is principle of work schematic diagram of the present invention;
Figure 11 is further work principle schematic of the present invention.
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 invention will be further described:
Below in conjunction with accompanying drawing and specific embodiment, the invention will be further described, is used for explaining the present invention in illustrative examples and the explanation of this invention, but not as a limitation of the invention.
As shown in Fig. 2 to Fig. 9, the present invention is the device of the crack propagation form for simulating carbon fiber reinforced concrete airfield pavement, 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, in the time that 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.When concrete shrinkage, be subject to the constraint from serrated end 2 and die trial end, in the time that 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.Adjust as needed, 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 accurately measured with fracture width testing tool in this process.In the time that crack mean breadth reaches design load, stop loading.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within being all included in protection scope of the present invention.
Claims (1)
1. for simulating the device of crack propagation form of carbon fiber reinforced concrete airfield pavement, 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 |
|---|---|---|---|
| CN201410196359.0A CN103954644A (en) | 2014-05-12 | 2014-05-12 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410196359.0A CN103954644A (en) | 2014-05-12 | 2014-05-12 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
Publications (1)
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| CN103954644A true CN103954644A (en) | 2014-07-30 |
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| CN201410196359.0A Pending CN103954644A (en) | 2014-05-12 | 2014-05-12 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632575A (en) * | 2004-12-31 | 2005-06-29 | 福州大学 | Induced cracking process for crack resistant performance test of cement base material and apparatus thereof |
| CN201344931Y (en) * | 2009-01-20 | 2009-11-11 | 水利部交通部电力工业部南京水利科学研究院 | High-performance combined evaluation device for concrete cracking resistance |
| US20100229641A1 (en) * | 2006-06-05 | 2010-09-16 | Illinois Tool Works Inc. | Anchor bolt and annularly grooved expansion sleeve assembly exhibiting high pull-out resistance, particularly under cracked concrete test conditions |
| CN103257220A (en) * | 2012-02-22 | 2013-08-21 | 北京中企卓创科技发展有限公司 | Concrete early-stage crack resistance test device and test method |
| CN203422375U (en) * | 2013-07-26 | 2014-02-05 | 高碑店市达奥新型建材有限公司 | Device for measuring shrinkage crack of cement-based grouting material |
| CN203858214U (en) * | 2014-05-12 | 2014-10-01 | 中国民航机场建设集团公司 | Device for simulating crack propagation form of airfield pavement |
-
2014
- 2014-05-12 CN CN201410196359.0A patent/CN103954644A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1632575A (en) * | 2004-12-31 | 2005-06-29 | 福州大学 | Induced cracking process for crack resistant performance test of cement base material and apparatus thereof |
| US20100229641A1 (en) * | 2006-06-05 | 2010-09-16 | Illinois Tool Works Inc. | Anchor bolt and annularly grooved expansion sleeve assembly exhibiting high pull-out resistance, particularly under cracked concrete test conditions |
| CN201344931Y (en) * | 2009-01-20 | 2009-11-11 | 水利部交通部电力工业部南京水利科学研究院 | High-performance combined evaluation device for concrete cracking resistance |
| CN103257220A (en) * | 2012-02-22 | 2013-08-21 | 北京中企卓创科技发展有限公司 | Concrete early-stage crack resistance test device and test method |
| CN203422375U (en) * | 2013-07-26 | 2014-02-05 | 高碑店市达奥新型建材有限公司 | Device for measuring shrinkage crack of cement-based grouting material |
| CN203858214U (en) * | 2014-05-12 | 2014-10-01 | 中国民航机场建设集团公司 | Device for simulating crack propagation form of airfield pavement |
Non-Patent Citations (2)
| Title |
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| PING XIE ET AL.: "Electrical percolation phenomena in cement composites containing conductive fibres", 《JOURNAL OF MATERIALS SCIENCE》, vol. 31, 31 December 1996 (1996-12-31) * |
| 刘岩等: "约束条件下混凝土开裂性能哑铃型测试方法研究", 《建筑材料学报》, vol. 14, no. 5, 31 October 2011 (2011-10-31) * |
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Application publication date: 20140730 |