CN108181181A - A kind of test compression and the device and method of cyclic bending concrete durability - Google Patents
A kind of test compression and the device and method of cyclic bending concrete durability Download PDFInfo
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- CN108181181A CN108181181A CN201810101153.3A CN201810101153A CN108181181A CN 108181181 A CN108181181 A CN 108181181A CN 201810101153 A CN201810101153 A CN 201810101153A CN 108181181 A CN108181181 A CN 108181181A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/024—Corrosive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
- G01N2203/0242—With circulation of a fluid
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Abstract
The invention discloses the device of a kind of test compression and cyclic bending concrete durability, including：Testing stand；The reaction frame being fixed on testing stand, reaction frame sidewall symmetry are equipped with two pieces of fixed blocks, the load bar moved up and down along reaction frame are equipped with below fixed block；Compressibility, it is divided into compression piece and lower compression piece, with fixed at the top of reaction frame, lower compression piece lower end is fixed with lateral load bar for upper compression piece upper end, upper compression piece lower end is equipped with fixing steel clamp with lower compression piece upper end, and jack is set between testing stand and lateral load bar；The cyclic bending system being fixed on reaction frame side wall；The condition test circulatory system, for providing concrete sample experimental enviroment；Data acquisition controller.Tested using the device of the invention, there is the features such as true and accurate, simple operable, cheap, to greatest extent close to electric power pylon concrete pipe base salt lose or freezing-thawing under bear compression and the operating mode of reciprocal wind action simultaneously.
Description
Technical field
The present invention relates to concrete strength and durability test field, more particularly, to a kind of test compression and cyclic bending
The device and method of concrete durability.
Background technology
There is the soil of the length and breadth of land and abundant wind resource, transmission line of electricity to pass through gobi, oasis, the energy is transported in Xinjiang
Local huge numbers of families are also transported to interior ground big city small town.The conveying of electric power energy be unable to do without electric power pylon, supports electric power pylon
The long-term security of concrete-pile is directly related to the safety of electric power pylon and entire transmission line of electricity.Support the concrete-pile of steel tower
The reciprocating (cyclic bending) of wind is born, while concrete-pile bears to be compressed axially effect under the huge dead weight of steel tower, i.e.,
The concrete-pile of support steel tower bears to be compressed axially simultaneously and the coupling of cyclic bending.Moreover, Xinjiang earth's surface salination is tight
Weight, annual salt erosion cause a large amount of infrastructure to be damaged.
In addition to this, Xinjiang belongs to seasonal frost region, and winter surface temperature is below the freezing point, and the water in concrete voids becomes ice crystal
Volume expansion, while the ice crystal into concrete of the non-freeze water outside concrete migrates, and leads to the ice crystal in concrete hollow gap
Volume increased dramatically, and ice crystal volume increased dramatically generates huge splitting power in inside concrete, show that macroscopic view is improved quality damage
It loses, integrality declines, and strength reduction, summer temp warms, and ice crystal disappears, in cycles, research shows that moisture supplement is frost heave
The main reason for, every year since freeze thawing causes a large amount of infrastructure to be damaged.
It can be used for test coagulation earth salt erosion durability instrument and equipment many both at home and abroad at present, the equipment for testing concrete strength
Also it has been reported that.But it for Xinjiang special region condition and the loading characteristic of column foot, that is, tests under salt erosion or freezing-thawing and bears
It is compressed axially and but rarely has people's research with the experimental rig of cyclic bending coupling concrete durability and method.
Invention content
The present invention provides a kind of test compression and the device and method of cyclic bending concrete durability, has true accurate
Really, it is simple operable, it is cheap the features such as, approach electric power pylon concrete pipe base to greatest extent in salt erosion or freezing-thawing
It is lower to bear compression and the operating mode of reciprocal wind action simultaneously, to bear larger wind load and salinized soil or frozen soil blazon area
The research of electric power pylon concrete pipe base provides technical support and theoretical direction.
A kind of test compression and the device of cyclic bending concrete durability, including：
Testing stand；
Reaction frame is fixed on testing stand；The reaction frame is equipped with the transverse direction moved up and down along reaction frame both sides side wall and adds
Carry bar；
Compressibility, is divided into compression piece and lower compression piece, and the upper compression piece upper end is described with fixed at the top of reaction frame
Lower compression piece lower end is fixed with lateral load bar, and the upper compression piece lower end is equipped with fixing steel clamp with lower compression piece upper end, institute
It states and jack is set between testing stand and lateral load bar；
Cyclic bending system is fixed on reaction frame side wall, for providing cyclic bending load to concrete sample；
The condition test circulatory system, for providing the experimental enviroment of concrete sample；
Data acquisition controller is electrically connected with compressibility and cyclic bending system.
The present invention is by compressibility, the effect of cyclic bending systematic collaboration so that it can act on concrete sample simultaneously
On with reach simulation concrete simultaneously bear compression, cyclic bending operating mode.
Preferably, the upper compression piece upper end, by fixed at the top of flexural pivot and reaction frame, the lower compression piece lower end leads to
Flexural pivot is crossed to fix with load bar.
Preferably, the fixing steel clamp inner surface is equipped with rubber pad.Fixing steel clamp makes the active force being compressed axially more
It is uniform to act on concrete surface, and play cushioning effect by setting rubber pad, and to concrete sample compression.Both it can protect
Concrete sample caused by effective transmission of card power can prevent Stress non-homogeneity again destroys.
Preferably, being equipped with first pressure sensor between the jack and lateral load bar, the first pressure passes
Sensor is electrically connected with data acquisition controller.
By adjusting jack, lateral load bar moving up and down is moved up, concrete sample is generated axial
Compression, the action intensity that is compressed axially of concrete sample are measured by first pressure sensor.
In apparatus of the present invention, the cyclic bending system includes：Electric cylinder；It is fixed on electric cylinder bottom and reaction frame side wall
Between second pressure sensor；It is connect with the telescopic rod at the top of electric cylinder, for the test specimen retainer ring of fixing concrete test specimen；
The electric cylinder, second pressure sensor are electrically connected with data acquisition controller.
The present invention provides power, electric cylinder effect using the linear reciprocating motion of electric cylinder for concrete sample cyclic bending
In test specimen retainer ring, can not only ensure power it is effective transmit but also can prevent electric cylinder from directly acting on concrete sample cause stress collection
In caused concrete sample destroy.
Preferably, load adjusting gasket is equipped between telescopic rod and test specimen retainer ring at the top of the electric cylinder.
Since the displacement of electric cylinder is fixed, the bending of concrete is made to adjust electric cylinder by load adjusting gasket
With gasket is more, and load is bigger.Effect size is calculated by the second pressure sensor values being located between electric cylinder and reaction frame
It obtains.
In apparatus of the present invention, the condition test circulatory system can be that salt loses system, and salt erosion system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with brine, is connected with rubber sleeve, and it is not high in invading for concrete sample to adjust brine by air inlet pipe
Degree.
Concrete sample upper and lower ends prevent brine from leaking out using seal with elastometic washer, and Markov bottle fills for use brine and rubber
Set is connected, and provides concrete sample constant salt and loses water level, concrete sample salt erosion water level above section utilizes the capillary of sandy soil
Effect carries out salt erosion, and true environment is simulated to greatest extent with this.
Preferably, the condition test circulatory system can also be freezing and thawing system, the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with pure water, is connected with rubber sleeve, and it is not high in invading for concrete sample to adjust pure water by air inlet pipe
Degree；
Freezing-thawing chamber wraps up the testing stand, reaction frame, compressibility and cyclic bending system to provide freeze thawing
Environment.
Test compression described in any of the above-described technical solution and cyclic bending coagulation earth salt are utilized the present invention also provides a kind of
The method that the device of erosion durability is tested, includes the following steps：
Step 1, compressibility, cyclic bending system and the condition test circulatory system cooperate, and concrete sample is consolidated
It is scheduled in reaction frame；
Step 2, jack in compressibility is adjusted, lateral load bar is pushed to move up and forces its longitudinal extruded concrete
Test specimen stops loading when data acquisition controller is collected when pulling force reaches setting numerical value, and at this moment concrete axial tension stress is：
Wherein, σ1For concrete sample axial tension stress, F1Pulling force is collected for data acquisition controller, A is tried for concrete
Part area of section；
Step 3, the linear motion reciprocating frequence of cyclic bending system is controlled to try concrete by data acquisition controller
Part applies cyclic bending load, and by data acquisition controller record load F2, then cyclic bending system concrete sample is applied
The moment added is：
Wherein, the cyclic bending Maximum bending moment that M is born for concrete sample, F2Pressure for data acquisition controller acquisition
Force value, L are concrete sample length；
Step 4, experiment is completed concrete sample to take out, is placed on omnipotent concrete compression test and obtains concrete examination
Part axial compressive strength standard value, then calculates cubic compressive strength standard value, and calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1For prism intensity
With the ratio of cube strength, αc2For Brittleness of Concrete coefficient.
The present invention loses the synergistic effect of system so that it can act on simultaneously by compressibility, cyclic bending system and salt
In on concrete sample, electric power pylon concrete pipe base bears to compress simultaneously in approaching to reality environment to greatest extent, reciprocal wind
The operating mode of the effects that load, salt loses；The apparatus structure is simple, is conveniently operated, can by adjusting jack and load adjusting gasket
With large range of adjusting compressing force and the size of cyclic bending active force, acquisition mass data is for researching and analysing, to hold
Technical support and theoretical direction are provided by the research of electric power pylon concrete pipe base that larger wind load and salinized soil blazon area.
Description of the drawings
Fig. 1 is the structure diagram that apparatus of the present invention lose system with salt；
Fig. 2 is the structure diagram of compressibility of the present invention；
Fig. 3 is the structure diagram of cyclic bending system of the present invention；
Fig. 4 is the structure diagram that salt of the present invention loses system；
Fig. 5 is structure diagram of the apparatus of the present invention with freezing and thawing system.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description：
As shown in Figure 1, a kind of test compression and the device of cyclic bending concrete durability, including testing stand 1, reaction frame
2nd, compressibility, cyclic bending system 3, the condition test circulatory system and data acquisition controller 5.In the present embodiment, condition examination
It tests the circulatory system and system 4 is lost using salt.Reaction frame 2 is mounted on testing stand 1, and 2 side wall of reaction frame is equipped with one piece of fixed block 6, Gu
Determine 6 lower section of block and be equipped with the lateral load bar 7 that can be moved up and down along 2 side wall of reaction frame.Compressibility includes upper compression piece, pushing
Contracting part, jack 8 and first pressure sensor 9.Upper compression piece upper end is fixed by flexural pivot 10 and 2 top of reaction frame, pushes
9 lower end of contracting part is fixed by flexural pivot 10 and lateral load bar 7, and 8 bottom of jack is mounted on testing stand 1, top installation first
It offsets after pressure sensor 9 with lateral load bar 7.First pressure sensor 9 is electrically connected with data acquisition controller 5.
As shown in Fig. 2, in compressibility, upper compression piece is symmetrical arranged with lower compression piece, upper compression piece lower part and lower compression
Part top is respectively and fixedly provided with fixing steel clamp 11, and 11 inner surface of fixing steel clamp is equipped with rubber pad 12, when being compressed to concrete sample from
To cushioning effect.
As shown in figure 3, cyclic bending system includes electric cylinder 31, test specimen retainer ring 32 and second pressure sensor 33,
Be fixed on 2 side wall of reaction frame after 31 bottom of electric cylinder installation second pressure sensor 33, the telescopic rod at 31 top of electric cylinder with
Load adjusting gasket 34 is equipped between test specimen retainer ring 32.Electric cylinder 31, second pressure sensor 33 all with data acquisition control
Device 5 is electrically connected.
Power is provided for concrete sample cyclic bending using the linear reciprocating motion of electric cylinder 31, electric cylinder 31 acts on
The test specimen retainer ring 32 being fixed in the middle part of test specimen can not only ensure that the effective of power transmitted but also can to prevent electric cylinder 31 from directly acting on mixed
Solidifying soil test specimen causes stress concentration to cause concrete destruction, since the displacement of electric cylinder 31 is fixed, passes through load spacer
Piece 34 acts on the opposite of concrete sample to adjust electric cylinder 31, and gasket is more, and load is bigger.The size of load is by being located at
Second pressure sensor 33 between electric cylinder 31 and reaction frame 2 measures.
As shown in figure 4, salt erosion system 4 includes sandy soil 42, rubber sleeve 43 and Markov bottle 44；Concrete sample is placed in rubber sleeve
Symmetrically filling gap, upper and lower ends are sealed using the rubber pad 12 of sealing in 43 and with sandy soil 42, and Markov bottle 44 fills for use salt
Water is connected with rubber sleeve 43.Brine is adjusted by the air inlet pipe 45 in Markov bottle 44 and invades no height in concrete sample, to mixed
Solidifying soil test specimen provides constant salt erosion water level, and concrete sample salt loses water level above section and carries out salt using the capillarity of sandy soil 42
Erosion, simulates true environment to greatest extent.
As shown in figure 5, the condition test circulatory system in the experimental rig can also use freezing and thawing system, with being lost using salt
The device of system is compared, and what Markov bottle 44 filled is pure water, and whole for wrapping up equipped with freezing-thawing chamber 13 outside device
A experimental rig is to provide freezing-thawing.44 Markov bottle 44 of Markov bottle is filled for use pure water with rubber sleeve 43 to be connected.Pass through horse
Air inlet pipe 45 on family name's bottle 44 adjusts pure water and invades no height in concrete sample, provides constant water level to concrete sample, mixes
Solidifying soil test specimen water level above section is supplemented using the capillarity of sandy soil 42, and operation freezing-thawing chamber 13 reduces experiment
The temperature of environment simulates true freezing-thawing to greatest extent.
Using the device with salt erosion system, test compression and the method for cyclic bending concrete durability, including following step
Suddenly：
(1) concrete sample to be measured is put into rubber sleeve 43, and is tamped therebetween with 2cm thickness sandy soil compression；
(2) first pressure sensor 9 and jack 8 are placed between moveable lateral load bar 7 and testing stand 1；
(3) concrete sample of periphery package rubber sleeve 43 is fixed with test specimen retainer ring 32, fixed position is concrete
The intermediate position of test specimen；
(4) sealing rubber pad 12 is placed on concrete both ends and is fixed with fixing steel clamp 11；
(5) adjusting jack 8 pushes up moveable lateral load bar 7 and moves up fixing concrete test specimen；
(6) load adjusting gasket 34 is added in test specimen retainer ring 32 and install according to the needs of cyclic bending load
Electric cylinder 31 and second pressure sensor 33；
(7) it will seal and connect with rubber sleeve 43 after perfusion brine in Markov bottle 44, adjusting air inlet pipe 45, which makes to invade, does not have coagulation
Invading for native test specimen does not reach specified altitude assignment highly, invades and does not have above section to carry out moisture supplement by 42 capillarity of sandy soil, completes
Salt erosion is acted on more approaching to reality environment.
(8) jack 8 in compressibility is adjusted, lateral load bar 7 is pushed to move up and forces its longitudinal extruded concrete
Test specimen stops loading when first pressure sensor 9 reaches setting numerical value, and at this moment concrete axial tension stress is：
Wherein, σ1For concrete sample axial tension stress, F1Pressure value is shown for first pressure sensor, and A is tried for concrete
Part area of section；
(9) the linear motion reciprocating frequence of electric cylinder is controlled to apply back and forth concrete sample by data acquisition controller
Bending load, and load F is recorded by second pressure sensor 332, then the moment that electric cylinder applies concrete sample is：
Wherein, the cyclic bending Maximum bending moment that M is born for concrete sample, F2The pressure shown for second pressure sensor
Force value, L are concrete sample length；
(10) experiment is completed concrete sample to take out, is placed on omnipotent concrete compression test and obtains concrete sample
Axial compressive strength standard value, and suggest that relational expression obtains cubic compressive strength standard value used in engineering practice by specification,
The cubic compressive strength standard value calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1For prism intensity
With the ratio (Code for design of concrete structures GB 50010-2010) of cube strength, αc2For Brittleness of Concrete coefficient (concrete
Code for structural design GB 50010-2010).
Claims (9)
1. a kind of test compression and the device of cyclic bending concrete durability, which is characterized in that including：
Testing stand；
Reaction frame is fixed on testing stand；The reaction frame is equipped with the lateral load bar moved up and down along reaction frame both sides side wall；
Compressibility is divided into compression piece and lower compression piece, the upper compression piece upper end and fixed at the top of reaction frame, the pushing
Contracting part lower end is fixed with lateral load bar, and the upper compression piece lower end is equipped with fixing steel clamp, the examination with lower compression piece upper end
It tests between platform and lateral load bar and jack is set；
Cyclic bending system is fixed on reaction frame side wall, for providing cyclic bending load to concrete sample；
The condition test circulatory system, for providing the experimental enviroment of concrete sample；
Data acquisition controller is electrically connected with compressibility and cyclic bending system.
2. test compression according to claim 1 and the device of cyclic bending concrete durability, which is characterized in that described
By fixed at the top of flexural pivot and reaction frame, the lower compression piece lower end is consolidated by flexural pivot and lateral load bar for upper compression piece upper end
It is fixed.
3. test compression according to claim 1 and the device of cyclic bending concrete durability, which is characterized in that described
Fixing steel clamp inner surface is equipped with rubber pad.
4. test compression according to claim 1 and the device of cyclic bending concrete durability, which is characterized in that described
First pressure sensor, the first pressure sensor and data acquisition controller electricity are equipped between jack and lateral load bar
Connection.
5. test compression according to claim 1 and the device of cyclic bending concrete durability, which is characterized in that described
Cyclic bending system includes：Electric cylinder；The second pressure sensor being fixed between electric cylinder bottom and reaction frame side wall；With electricity
Telescopic rod connection at the top of dynamic cylinder, for the test specimen retainer ring of fixing concrete test specimen；The electric cylinder, second pressure sensor
It is electrically connected with data acquisition controller.
6. test compression according to claim 5 and the device of cyclic bending concrete durability, which is characterized in that described
Load adjusting gasket is equipped between telescopic rod and test specimen retainer ring at the top of electric cylinder.
7. test compression according to claim 1 and the device of cyclic bending concrete durability, which is characterized in that described
The condition test circulatory system loses system for salt, and salt erosion system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with brine, is connected with rubber sleeve, and adjust brine by air inlet pipe invades no height in concrete sample.
8. test compression according to claim 1 and the device of cyclic bending concrete durability, which is characterized in that described
The condition test circulatory system is freezing and thawing system, and the freezing and thawing system includes：
Rubber sleeve is wrapped on the outside of concrete sample, and with sandy soil fill between gap；
Sealing rubber ring seals concrete sample and rubber sleeve positioned at concrete sample end；
Markov bottle equipped with pure water, is connected with rubber sleeve, and adjust pure water by air inlet pipe invades no height in concrete sample；
Freezing-thawing chamber wraps up the testing stand, reaction frame, compressibility and cyclic bending system to provide freeze thawing ring
Border.
9. it is a kind of using any one of the claim 1-8 test compressions and cyclic bending coagulation earth salt erosion durability device into
The method of row experiment, which is characterized in that include the following steps：
Step 1, compressibility, cyclic bending system and the condition test circulatory system cooperate, and concrete sample is fixed on
In reaction frame；
Step 2, jack in compressibility is adjusted, load bar is pushed to move up and forces its longitudinal extruded concrete test specimen, when
Data acquisition controller, which is collected when pressure reaches setting numerical value, stops loading, and at this moment concrete axial compression stress is：
Wherein, σ1For concrete sample axial compression stress, F1The pressure of compressibility is collected for data acquisition controller, A is mixed
Solidifying soil test specimen area of section；
Step 3, the linear motion reciprocating frequence for controlling cyclic bending system by data acquisition controller applies concrete sample
Add cyclic bending load, and by the load F of data acquisition controller record cyclic bending system2, then cyclic bending system is to mixed
Coagulating the moment that soil test specimen applies is：
Wherein, the cyclic bending Maximum bending moment that M is born for concrete sample, F2Cyclic bending is acquired for data acquisition controller
The pressure value of system, L are concrete sample length；
Step 4, experiment is completed concrete sample to take out, is placed on omnipotent concrete compression test and obtains concrete sample axis
Heart compressive strength standard value, then calculates cubic compressive strength standard value, and calculation formula is：
Wherein, fcu,kFor cubic compressive strength standard value, fckFor axial compressive strength standard value, αc1Be prism intensity with it is vertical
The ratio of cube intensity, αc2For Brittleness of Concrete coefficient.
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| CN102721637A (en) * | 2012-06-29 | 2012-10-10 | 浙江大学 | Multi-functional test system and method for concrete durability under action of continuous pressure |
| CN105466774A (en) * | 2015-11-20 | 2016-04-06 | 苏交科集团股份有限公司 | Hand-held type concrete compression test device |
| CN106501489A (en) * | 2016-12-09 | 2017-03-15 | 长安大学 | Coarse Saline salt is swollen and molten sunken multifunction test device |
| CN208043559U (en) * | 2018-02-01 | 2018-11-02 | 塔里木大学 | A kind of device of test compression and cyclic bending concrete durability |
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