CN110333184A - A kind of steel fiber reinforced concrete adhesion strength tension test part and tensile test apparatus - Google Patents
A kind of steel fiber reinforced concrete adhesion strength tension test part and tensile test apparatus Download PDFInfo
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- CN110333184A CN110333184A CN201910712349.0A CN201910712349A CN110333184A CN 110333184 A CN110333184 A CN 110333184A CN 201910712349 A CN201910712349 A CN 201910712349A CN 110333184 A CN110333184 A CN 110333184A
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- steel fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The present invention relates to a kind of steel fiber reinforced concrete adhesion strength tension test part and tensile test apparatus, tensile test apparatus, including cupping machine, heating device and tension test part, cupping machine includes upper loading head and lower loading head setting up and down, tension test part includes steel fibre, the both ends of steel fibre pour the first concrete block and the second concrete block being fixed with for being connected with the upper loading head of cupping machine and lower loading head, steel fibre part between first concrete block and the second concrete block forms steel fibre free segment, the periphery of steel fibre free segment is provided with for reducing the heat insulation foam of steel fibre free segment heating rate.The present invention provides a kind of for carrying out the steel fiber reinforced concrete adhesion strength tension test part of tension test to steel fiber reinforced concrete adhesion strength under high temperature environment and using the tensile test apparatus of the steel fiber reinforced concrete adhesion strength tension test part.
Description
Technical field
The present invention relates under hot environment in tension test field steel fiber reinforced concrete adhesion strength tension test part and
Tensile test apparatus.
Background technique
In recent years, become with the high-rise China of field of civil engineering, greatly across all various development such as change, lightweight and durableization
Gesture, the concrete material containing steel fibre such as steel fiber reinforced concrete, ultra-high performance concrete skyscraper, labyrinth, greatly across
Spend bridge, particular service requirement and harsh environment (such as offshore platform, seabed tunnel, nuclear facilities and military protection engineering) field
Using more and more extensive, the high temperature fire resistance of the materials such as steel fiber reinforced concrete, ultra-high performance concrete also proposed newly
Requirement, fire resistance research be also referred to as hot spot.
The deterioration of the mechanical properties such as steel fiber reinforced concrete, ultra-high performance concrete includes steel fibre mechanical property in high temperature
Deterioration and mechanical performance of concrete deterioration and steel fibre and the deterioration of Concrete Bond Strength performance, wherein steel fibre and concrete
Adhesive property deterioration plays a crucial role the intensity of whole building component, and influence of the deterioration to mechanical property is even
More than the deterioration of steel fibre or concrete itself.Lacking in the prior art under high temperature environment to bond steel fiber reinforced concrete
The tension test part that intensity is tested.
Summary of the invention
The purpose of the present invention is to provide one kind for drawing under high temperature environment steel fiber reinforced concrete adhesion strength
Stretch the steel fiber reinforced concrete adhesion strength tension test part of test；The steel fibre is used the object of the invention is also to provide a kind of
The tensile test apparatus of Concrete Bond Strength tension test part.
In order to solve the above technical problems, the technical solution of steel fiber reinforced concrete adhesion strength tension test part is such as in the present invention
Under:
Steel fiber reinforced concrete adhesion strength tension test part, including steel fibre, the both ends of steel fibre pour be fixed with for drawing
Stretch the loading head of testing machine connected the first concrete block and the second concrete block, the first concrete block and the second concrete block it
Between steel fibre part formed steel fibre free segment, the periphery of steel fibre free segment is provided with for reducing steel fibre free segment liter
The heat insulation foam of warm speed.
First concrete block, the second concrete block include realizing and being connected with loading head for being located on the outside of corresponding heating furnace
Crosspiece and pour connected perpendicular section with the corresponding end of steel fibre, crosspiece and perpendicular section constitute T-shaped structure.
Tensile test apparatus, including cupping machine, heating device and tension test part, cupping machine include above dividing into
The upper loading head and lower loading head set, tension test part include steel fibre, the both ends of steel fibre pour be fixed with for stretching
The first concrete block and the second concrete block that the upper loading head of testing machine is connected with lower loading head, the first concrete block and second
Steel fibre part between concrete block forms steel fibre free segment, and the periphery of steel fibre free segment is provided with for reducing steel fibre
Tie up the heat insulation foam of free segment heating rate.
Heating device includes heating furnace, and test specimen perforation, tension test part are provided on the upper furnace wall of heating furnace and lower furnace wall
It is through in test specimen perforation.
First concrete block, the second concrete block include realizing and being connected with loading head for being located on the outside of corresponding heating furnace
Crosspiece and pour connected perpendicular section with the corresponding end of steel fibre, crosspiece and perpendicular section constitute T-shaped structure.
Heating device further includes heating furnace cradle, and guiding movement is assemblied on heating furnace cradle heating furnace along the longitudinal direction,
Test specimen is perforated at least two, each test specimen perforation arranged for interval along the longitudinal direction, is provided on heating furnace for trying strain stretch
Test the fixation device of the removable fixation of part.
Tensile test apparatus further includes large deformation extended device, and large deformation extended device includes being arranged in juxtaposition up and down and can be upper and lower
The upper measurement arm and lower measurement arm for relatively moving and being moved away from direction, upper measurement arm are mixed with the first of corresponding tension test part
Solidifying soil block is connected, and lower measurement arm is connected with the second concrete block of corresponding tension test part.
The invention has the benefit that when test, by heating device to the steel fibre and steel fibre of tension test part with
The casting position of concrete is heated, and to simulate hot environment, the setting of heat insulation foam avoids the exposed heating of steel fibre free segment
And it is too fast to heat up, if the exposed heating of steel fibre free segment is very fast without heat insulation foam, and steel fibre pours with concrete block and is connected
Adhesive section due to having the presence of concrete layer and heating rate is slower, the temperature of steel fibre free segment is apparently higher than adhesive section
Temperature, steel fibre is broken from steel fibre free segment when be easy to causeing load, and cannot test out the bonding of steel fibre and concrete
Intensity reduces the heating rate of steel fibre free segment after heat insulation foam, so that it is not had apparent intensity in load bad
Change, the adhesive section that is connected in steel fibre with concreting occurs to make to destroy, to realize under hot environment to steel fibre, mix
The adhesion strength for coagulating soil is tested.
Further, test specimen perforation is provided on heating furnace, tension test part is through in test specimen perforation, the first concrete block
Crosspiece be located on the outside of heating furnace and be used to connect with upper loading head, the crosspiece of the second concrete is located at the outside of heating furnace and uses
When connecting, therefore loading in lower loading head, be not required to so that tension test part is detached from by heating furnace, avoid tension test part with plus
The problem of hot stove is detached from and causes temperature to reduce, test temperature is not achieved.
It further,, can be with by being moved forward and backward heating furnace after completing the tensile loads test of tension test part
Another tension test part is moved to loading position and carries out tension test part, each tension test part is heated furnace while adding
On the one hand heat can save the energy, the test temperature in addition it can guarantee each tension test part is consistent.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one embodiment of tensile test apparatus in the present invention；
Fig. 2 is the cooperation schematic diagram of heating furnace and tension test part in Fig. 1；
Fig. 3 is the cooperation schematic diagram that device Yu tension test part are fixed in Fig. 1.
Specific embodiment
The implementation of tensile test apparatus of the present invention is for example shown in Fig. 1 ~ 3: including cupping machine, heating device, stretching examination
Test part and large deformation extended device 17, cupping machine includes the column 2 that pedestal 24 is fixed on pedestal 24, vertically side on column
It is equipped with crossbeam 1 to guiding movement, loading head 3 is provided on crossbeam 1, is provided with and is loaded under mechanism driving on pedestal 24
Loading head 23, the loading mechanism in the present embodiment is the load cylinder (not shown) being vertically arranged, under load cylinder driving, under
Loading head can move up and down and apply vertical tension to tension test part.
Tension test part includes steel fibre 18, and the both ends of steel fibre are adhesive section 15, is poured in the adhesive section of upside connected
There is the first concrete block 6, is poured in the adhesive section of downside and be fixed with the second concrete block 21, the first concrete block 6, the second coagulation
Steel fibre part between soil block 21 forms steel fibre free segment 16, and the periphery of steel fibre free segment 16 is provided with for reducing steel
The heat insulation foam 19 of fiber free segment heating rate, the upper and lower ends of heat insulation foam 19 and the first concrete block, the second concrete block it
Between without attachment force.First concrete block 6, the second concrete block 21 include being used to be located on the outside of corresponding heating furnace and realize and add
The crosspiece 8 and pour connected perpendicular section 9 with the corresponding end of steel fibre that carrier head is connected, crosspiece 8 and perpendicular section 9 constitute T-shaped structure.
Implement to load to cooperate the shape of the first concrete block, the second concrete block, upper loading head, lower loading head include offside door
Shape hangs 4 and offside door shape extension 5, and the hinge axes that offside door shape is hung, offside door shape is hung are extended along the longitudinal direction, offside door shape
Crosspiece both ends can just be tangled by hanging 4, offside door shape extension 5.
Heating device includes heating furnace cradle 22 and guiding movement is assemblied in the heating on heating furnace cradle along the longitudinal direction
Furnace 25 heats and is provided with the graduation mark 26 that front and back is arranged on furnace cradle, and inside heating furnace has heater strip, and the bottom of heating furnace is set
It is equipped with and realizes that it moves up dynamic traveling wheel 20 in heating furnace cradle, heating furnace includes upper furnace wall 12, lower furnace wall 13 and is set to
Surrounding furnace wall between furnace wall 12, lower furnace wall 13, heating furnace are integrally in the rectangular box assembling structure that length extends along the longitudinal direction.
Multiple test specimen perforation in the test specimen perforation 29 of heating furnace, the present embodiment along the vertical direction are provided on upper furnace wall, lower furnace wall
29 number is six, each test specimen perforation arranged for interval along the longitudinal direction.It is provided on the upper furnace wall of heating furnace and is worn with each test specimen
The corresponding fixed device 7 in hole, fixed device 7 fix device packet for being fixed temporarily to tensile test specimen in the present embodiment
Fixed ring 27 is included, Screw assembly has Top fastening screw 28 in fixed ring, screws Top fastening screw 28, and Top fastening screw presses tension test part
The first concrete block perpendicular section, may be implemented the fixation to tension test part, unclamp Top fastening screw, can be to tension test part
Carry out tension test.
Large deformation extended device 17 includes being arranged in juxtaposition up and down and capable of relatively moving and be moved away from the up-down direction and is upper
Measure arm 10 and lower measurement arm, upper measurement arm 10 is connected with the first concrete block of corresponding tension test part, lower measurement arm with it is right
Second concrete block of strain stretch testpieces is connected, in the present embodiment the first concrete block, be provided on the second concrete block
Horizontal spliced eye, upper measurement arm are realized and 6 phase of the first concrete block by being plugged in the horizontal spliced eye of the first concrete block
Even, lower measurement arm is connected by being plugged in the horizontal spliced eye of the second concrete block realization with the second concrete block 21.At this
In the other embodiments of invention, loading head can not also be hung by offside door shape, offside door shape is hung and connected with corresponding concrete block,
Such as loading head has the T shape hanging groove of one with corresponding concrete block adaptation, is realized and corresponding concrete block by T shape hanging groove
Connection；The number of test specimen perforation, which can according to need, to be configured, such as two, three or other numbers.
When in use, each tension test part is through at corresponding test specimen to perforate, the size of test specimen perforation is greater than tension test
The full-size of part is fixed each tension test part by fixed device, gap between tension test part and test specimen perforation
It can be filled with heat-barrier material.The steel fibre of tension test part is in heating furnace, by heating furnace to each tension test part into
Row heating, the heat insulation foam of steel fibre free segment periphery can reduce the heating rate of steel fibre free segment, after heating, on
Loading head downlink and the first concrete block, which are hung, to be connected, and upper loading head uplink and the second concrete block are hung and connected, and unclamps the tension test part
Corresponding fixed device carries out tensile loads to tension test part by lower loading head, due to the use of heat insulation foam, so that at first
Bonding position in steel fibre and concrete block occurs for the position of disconnection, guarantee test result be exactly steel fibre and concrete it
Between adhesion strength.After to a tension test part tension test, it can be moved forward and backward heating furnace, by another tension test
Part is moved to loading position, carries out tension test, and each tension test part is in the same heating furnace, on the one hand can save energy
Source, in addition it can guarantee each tension test part test temperature consistency, to obtain more true hot environment pair
The influence data of steel fiber reinforced concrete adhesion strength.
The implementation of steel fiber reinforced concrete adhesion strength tension test part is for example shown in Fig. 1 ~ 3: steel fiber reinforced concrete bonding is strong
Degree tension test part is identical as above-mentioned each tensile test apparatus tension test part as described in the examples, and this will not be detailed here.
Claims (7)
1. steel fiber reinforced concrete adhesion strength tension test part, it is characterised in that: including steel fibre, the both ends of steel fibre pour solid
It is connected with the first concrete block and the second concrete block being connected for the loading head with cupping machine, the first concrete block and
Steel fibre part between two concrete blocks forms steel fibre free segment, and the periphery of steel fibre free segment is provided with for reducing steel
The heat insulation foam of fiber free segment heating rate.
2. tension test part according to claim 1, it is characterised in that: the first concrete block, the second concrete block include
The crosspiece being connected with loading head is realized for being located on the outside of corresponding heating furnace and is poured with the corresponding end of steel fibre connected
Perpendicular section, crosspiece and perpendicular section constitute T-shaped structure.
3. tensile test apparatus, including cupping machine, heating device and tension test part, cupping machine include setting up and down
Upper loading head and lower loading head, it is characterised in that: tension test part includes steel fibre, the both ends of steel fibre pour be connected it is useful
In the first concrete block and the second concrete block that are connected with the upper loading head of cupping machine and lower loading head, the first concrete
Steel fibre part between block and the second concrete block forms steel fibre free segment, and the periphery of steel fibre free segment, which is provided with, to be used for
Reduce the heat insulation foam of steel fibre free segment heating rate.
4. tensile test apparatus according to claim 3, it is characterised in that: heating device includes heating furnace, heating furnace
Test specimen perforation is provided on upper furnace wall and lower furnace wall, tension test part is through in test specimen perforation.
5. tensile test apparatus according to claim 4, it is characterised in that: the first concrete block, the second concrete block packet
It includes for being located on the outside of corresponding heating furnace and realizes the crosspiece being connected with loading head and poured with the corresponding end of steel fibre connected
Perpendicular section, crosspiece and perpendicular section constitute T-shaped structure.
6. tensile test apparatus according to claim 4, it is characterised in that: heating device further includes heating furnace cradle, is added
Guiding movement is assemblied on heating furnace cradle hot stove along the longitudinal direction, and test specimen is perforated at least two, and each test specimen perforation is along front and back
Direction arranged for interval is provided with the fixation device for corresponding to the removable fixation of tension test part on heating furnace.
7. tensile test apparatus according to claim 3, it is characterised in that: tensile test apparatus further includes large deformation amplification
Meter, large deformation extended device include be arranged in juxtaposition up and down and the upper measurement arm that can relatively move and be moved away from the up-down direction and
Lower measurement arm, upper measurement arm and the first concrete block of corresponding tension test part are connected, lower measurement arm and corresponding tension test part
The second concrete block be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910712349.0A CN110333184B (en) | 2019-08-02 | 2019-08-02 | Steel fiber concrete bonding strength tensile test piece and tensile test device |
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| CN201910712349.0A CN110333184B (en) | 2019-08-02 | 2019-08-02 | Steel fiber concrete bonding strength tensile test piece and tensile test device |
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| CN110333184A true CN110333184A (en) | 2019-10-15 |
| CN110333184B CN110333184B (en) | 2022-04-19 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111239041A (en) * | 2020-02-03 | 2020-06-05 | 天津大学 | Steel wire pulling-out test device under high temperature |
| CN111879702A (en) * | 2020-09-09 | 2020-11-03 | 扬州大学 | Bonding sliding fire-resistant test equipment |
| CN113820202A (en) * | 2021-09-26 | 2021-12-21 | 西安建筑科技大学 | Hollow high-temperature drawing test device |
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| CN111239041A (en) * | 2020-02-03 | 2020-06-05 | 天津大学 | Steel wire pulling-out test device under high temperature |
| CN111879702A (en) * | 2020-09-09 | 2020-11-03 | 扬州大学 | Bonding sliding fire-resistant test equipment |
| CN113820202A (en) * | 2021-09-26 | 2021-12-21 | 西安建筑科技大学 | Hollow high-temperature drawing test device |
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| CN110333184B (en) | 2022-04-19 |
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