CN106644692A - Test device for determining creep of concrete - Google Patents
Test device for determining creep of concrete Download PDFInfo
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- CN106644692A CN106644692A CN201611162302.4A CN201611162302A CN106644692A CN 106644692 A CN106644692 A CN 106644692A CN 201611162302 A CN201611162302 A CN 201611162302A CN 106644692 A CN106644692 A CN 106644692A
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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
- G01N3/02—Details
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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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to the field of research on creep and breaking of concrete and provides a test device for determining creep of concrete. A concrete sample fixed with a displacement measurement clamp and a dial indicator is placed onto a loading frame; a wrench is used for loading; the load magnitude is reflected by a force value display which is connected with a load sensor; the wrench is stopped rotating and is held for a period of time when a required force value is loaded; after the ending of the loading, the data are collected and recorded once a day; if the indicating value of the dial indicator is suddenly changed under the effect of artificial disturbance in the whole test process, the suddenly changed value is removed when the data are processed; and in the test process, if the missed loading exceeds 2%, the wrench is used for supplementing the loading. The device has the advantages of simplicity in operation, high independence, high universality, accurate measurement, stable loading and adaptation to long-term three-point bending loading. The device is low in cost, is reusable, is reliable in long-term measurement, is not influenced by power outage, meets the precision requirement and is capable of accurately reflecting the displacement change of the sample under long-lasting loading condition.
Description
Technical field
The invention belongs to concrete creep fault analysis field, is related to using a kind of three-point bending Creep Loading Equipment and Xu
Becoming deformation measuring device carries out concrete creep fault analysis, and in particular to apply constant load simultaneously to test specimen using holding to carry to put
Determine the time dependent displacement of concrete sample.
Background technology
Bending Concrete Creep Loading Equipment main purpose is to apply long-term three-point bending load to concrete sample.In examination
Lotus is held during testing to be needed to maintain in stable situations, and the charger of current creep test mainly has lever to creep dress
Put, spring Creep Apparatus etc., be not well positioned to meet this experiment needs.Designed, designed of the present invention one is simply and reliably
Charger, as shown in Figure 2.Charger is mainly made up of top board, lower platen, pull bar, bolt, connector etc..This device
Loaded using in-migration under loading head by tightening bolt, loading range can reach test requirements document.In view of securing member pine
Relaxation problem and two screw mandrel Stress non-homogeneities cause lower platen to incline and make concrete sample unbalance stress problem, in loading
Front level meter carries out leveling.It is elastic keeping load constant by adjusting screw in time afterwards.
Concrete creep deformation measuring device main purpose is to determine test specimen under continuing load with the deformation of time.Select
The principle of measuring instrument is that range, precision all meet requirement, while consider price problem, it is also contemplated that test specimen size, shape etc.,
More importantly to adapt to long-term measurement to use.In conventional short term tests, using clip tens(i)ometer or electron displacement meter, pass through
IMC gathered datas.But in long term test, it is not suitable for using electrical type measuring instrument, because being likely to occur power-off or instrument
The problems such as breaking down, and its price cost is big, it is often more important that cannot fix for a long time.Based on this, the present invention voluntarily sets
A set of displacement measuring device is counted, as shown in Fig. 9, Figure 12.Measuring instrument selects amesdial, the measurement apparatus Long-Time Service to stablize
It is reliable, and meet required precision.
The content of the invention
It is an object of the invention to overcome shortcoming present in existing charger and measurement apparatus, a kind of operation letter of design
Single, load is stable, load scope is suitable, survey reading is convenient accurately, small volume, low-cost device.
Technical scheme：
A kind of device for determining concrete creep test, the device includes loading frame and deformation measuring device two parts；
Loading frame includes leading screw 9, lower platen 10, top board 7, nut 5, sensor 3, bearing 11 and loading head 4；Two silks
Bar 9 is screwed into successively in the screw at top board 7 and the two ends of lower platen 10, and after adjustment good position, top board 7 and lower platen 10 pass through
Nut 5 is adjusted to be fixed, and the holding level of top board 7 is made and in suitable height by adjusting the position of spiral shell nurse 5；Will be with interior spiral shell
The sleeve 2 of line is screwed on screw 1, is integrally stretched into top board 7, and is stuck in the draw-in groove of sleeve by screw and is blocked；Will
Sensor 3 is fixedly attached to the lower end of sleeve 2, then loading head 4 is fixed on sensor 3；Two bearings 11 are fixed on lower platen
On 10, bearing 11 is provided with pad rod, and test specimen to be measured is placed on pad rod；
Supporting pad at nut is installed；Fixed by the nut location of the bottom of top board 7 first according to the height of test specimen
Highly；When the timing of height one, height can be adjusted by tightening or unclamping screw 1.When the height more than needed of screw 1 cannot be adjusted
During section, can now pass through the sleeve of adjustment connection sensor 3 and screw 1.
After installing, treat test block and loaded.Loading is using spanner by tightening or unclamping screw to be tested
Part is exerted a force.Test specimen to be measured, loading head level are made before loading with level meter adjustment, it is ensured that stress is accurate.Load and hold and carried
Cheng Zhong, sensor 3 is used for measuring the situation of change of load, can accurately be shown by the force value display being connected with sensor 3
The size of load.During holding and carrying, the lax loss for necessarily causing test specimen stress to be measured crept with securing member of concrete,
The screw that screws up with a wrench if necessary carries out benefit load.Loaded using spanner and mended and carried, need space little, easy to operate.In order to improve
Versatility of the device to sensor model number, the component of Fig. 5,6,7 is each independent using threaded connection.When size sensor not
Meanwhile, need to only process the central portion and Fig. 5 internal diameter whorls of Fig. 8.
Deformation measuring device includes determining load(ing) point gearshift and determines crack mouth opening displacement device, further includes
Amesdial 15, crossbeam 13, small cubes block 14 and fixture 16, under continuing load effect, determine respectively load(ing) point displacement and split
Seam aperture displacement；
Determine load(ing) point gearshift：Small cubes block 14 is pasted onto at test specimen load(ing) point to be measured, fixed cross beam 13
Screw is pasted onto on test specimen neutral axis to be measured, and with bearing 11 on same vertical direction, crossbeam 13 is fixed on test specimen to be measured to screw
On, amesdial 15 is fixed on crossbeam 13, it is ensured that amesdial 15 is contacted with small cubes block 14 at load(ing) point；Continuing
Under load action, small cubes block 14 produces downward displacement, the increase of the registration of amesdial 15 with load(ing) point；
The described end position of crossbeam 13 1 is fixed, and another end position is adjustable, to adapt to the test specimen to be measured of different spans, i.e. shape
Into movable hinged shoe；When crossbeam 13 is produced to bottom offset, by adjusting to movable hinged shoe, crossbeam 13 is overall still to keep water
It is flat.The fixed position of crossbeam 13 is at neutral axis of the beam, it is therefore an objective to eliminate the impact of the displacement of bearing 11；The design of crossbeam 13 is firm with material
Degree is very much not easily deformed, and size design reasonable stability is good.Therefore the impact due to the insufficient rigidity of crossbeam 13 to displacement can be neglected
Slightly disregard.The rigidity of small cubes block 14 at the top of test specimen to be measured is big, contact area is little, be close to loading surface, therefore can be anti-well
Reflect load(ing) point displacement.
Determine crack mouth opening displacement device：Small cubes block 14 and fixture 16 are pasted onto pre- apart from test specimen bottom surface to be measured
At crack both sides 5mm processed, amesdial 15 is fixed by fixture 16, and make amesdial 16 withstand small cubes block 14, make amesdial
14 registration is between 0.7～0.9；Under continuing load effect, crack mouth opening displacement opens, amesdial 15 and small cubes
The relative distance of block 14 is reduced, and the registration of amesdial 15 is reduced.
Beneficial effects of the present invention：
During using the charger, it is big, logical that easy to operate, save space, loading and benefit carry simple, height adjustable control scope
It is strong with property and can meet test requirements document.Due to each test specimen independent loads and observation in process of the test, so operation is more flexible
Convenient and high precision.When unexpected situation occurs in certain test specimen, individually can in time adjust, not affected by other test specimens.
It does not interfere with each other between device, it is allowed to the presence of fabrication error between device.
Using the displacement measuring device, numerical value change is more stable, beats little.And this mechanical Meter cost is just
Preferably, can reuse, long-term measurement is reliable, still can normal work under outside outage condition, it is ensured that the integrality of measurement data,
Test specimen can be accurately reflected and holding load bottom offset change.
Description of the drawings
Fig. 1 is the top view of top board.
Fig. 2 is the front view of loading frame.
Fig. 3 is the top view of lower platen.
Fig. 4 is the schematic diagram of screw.
Fig. 5 is the schematic diagram of sleeve.
Fig. 6 is the schematic diagram of sensor.
Fig. 7 is the front view of loading head.
Fig. 8 is the top view of loading head.
Fig. 9 is the schematic diagram of load(ing) point displacement measurement.
Figure 10 is the front view of crossbeam.
Figure 11 is the top view of crossbeam.
Figure 12 is the schematic diagram of CMOD measurements.
Figure 13 is the schematic diagram of fixture.
In figure：1 screw；2 sleeves；3 sensors；4 loading heads；5 nuts；6 pads；7 top boards；8 screw threads；9 screw mandrels；Under 10
Pressing plate；11 bearings；12 draw-in grooves；13 crossbeams；14 small cubes blocks；15 amesdials；16 fixtures.
Specific embodiment
Below in conjunction with accompanying drawing and technical scheme, the specific embodiment of the present invention is further illustrated.
1. test prepares
Hold to carry and put：See accompanying drawing 2, loading frame size is 650X550X300mm (long X high X width).
Concrete：Adopt the ratio of mud for 0.5 C30 concrete, sample dimensions are 500X100X100mm.
Load transducer：Each loading frame matches somebody with somebody single load transducer (sensor specification is preferably appropriate), and payload values pass through
The force value read-out display matched with sensor is shown, sensor is being proofreaded using front.
Amesdial：Using quantity set group product is breathed out, commodity meet GB1219-2008 national standards.
Acquisition of information：Daily once, accuracy of reading should be 0.001mm to artificial reading.
Test environment：Temperature is 23 DEG C, and relative humidity is in 43% environment.
2. test specimen prepares
1) test specimen is prepared：The test specimen for having conserved is taken out from fog room, in outdoor one day is dried.Concrete sample is needed
Polish flat at the position of application jig, bearing and at load(ing) point.
2) setting-out mark：Test specimen front mark fixed cross beam screw position (on test specimen neutral axis, screw and bearing
(11) on same vertical direction), mark the position (the left and right 5mm setting-outs at seam) of fixture in test specimen bottom.Then alcohol is used
Wipe mark position.
3) viscose glue：Glue used by application jig is construction structure glue.By two kinds of glue 1 of the first and second components:3 are well mixed, and are coated in folder
Tool needs sticking veneer about 5mm thick, is then pressed against the above-mentioned mark of concrete sample, and standing solidifies completely for 24 hours.
4) stationary fixture：After construction structure glue solidifies completely, fixed cross beam and amesdial, and ensure amesdial and fixture
In contact.
5) test specimen is laid：After so having prepared, one time is reexamined.Test specimen it is last make riding position and loading position
Put, then test specimen is placed on loading frame, centering leveling is simultaneously adjusted to support position.If because foozle can not make test specimen water
At ordinary times, leveled up with thin slice.Test specimen will be in center during placement, it is to avoid cause eccentric force state.
3. load
The selected sensor tonnage of loading is greater than loading tonnage needed for experiment, so just can guarantee that load applies in place.
1) load：After all adjusting, load transducer power supply is connected, record amesdial initial reading.Then load, uniformly
Turn spanner to be loaded, make loading speed as far as possible consistent, until setting.
2) mend and carry：Load is held a few days ago, because fastener coming loose and beam body displacement payload values can decline, when payload values decline
Benefit load is carried out when 2%.
4. measure and record
Daily reading once, and is recorded.
5. unload
After off-test, unclamping screw makes to be moved into row unloading on loading head, takes out test specimen；Construction structure glue on test specimen leads to
Cross high-temperature baking to take off.
6. result
It is found by experiment that, the device can be very good used in bending creep test, measure for a long time reliable and stable.
Claims (2)
1. it is a kind of to determine the device that concrete creep is tested, it is characterised in that the device includes loading frame and deformation measuring device
Two parts；
Loading frame includes leading screw (9), lower platen (10), top board (7), nut (5), sensor (3), bearing (11) and loading head
(4)；Two screw mandrels (9) are screwed into successively in the screw at top board (7) and lower platen (10) two ends, after adjustment good position, top board
(7) adjusted by nut (5) and fixed with lower platen (10), make top board (7) keep level by adjusting the position of spiral shell nurse (5)
And in suitable height；To be screwed on screw (1) with female sleeve (2), integrally stretch into top board (7), and lead to
Cross screw and be stuck in the draw-in groove of sleeve and blocked；Sensor (3) is fixedly attached into the lower end of sleeve (2), then by loading head
(4) it is fixed on sensor (3)；Two bearings (11) are fixed on lower platen (10), and bearing (11) is provided with pad rod, test specimen to be measured
It is placed on pad rod；
Deformation measuring device includes determining load(ing) point gearshift and measure crack mouth opening displacement device, further includes thousand points
Table (15), crossbeam (13), small cubes block (14) and fixture (16), under continuing load effect, determine respectively load(ing) point displacement
And crack mouth opening displacement；
Determine load(ing) point gearshift：Small cubes block (14) is pasted onto at test specimen load(ing) point to be measured, fixed cross beam (13)
Screw is pasted onto on test specimen neutral axis to be measured, and with bearing (11) on same vertical direction, crossbeam (13) is fixed on to be measured screw
On test specimen, amesdial (15) is fixed on crossbeam (13), it is ensured that amesdial (15) is contacted with small cubes block (14) at load(ing) point
It is upper；Under continuing load effect, small cubes block (14) produces downward displacement with load(ing) point, and amesdial (15) registration increases
Greatly；
Determine crack mouth opening displacement device：Small cubes block (14) and fixture (16) are pasted onto pre- apart from test specimen bottom surface to be measured
At crack both sides 5mm processed, by the fixed amesdial (15) of fixture (16), and amesdial (16) is set to withstand small cubes block (14),
The registration of amesdial (14) is made between 0.7～0.9；Under continuing load effect, crack mouth opening displacement opens, amesdial
(15) reduce with the relative distance of small cubes block (14), amesdial (15) registration is reduced.
2. device according to claim 1, it is characterised in that determine the crossbeam (13) described in load(ing) point gearshift
End position is fixed, and another end position is adjustable, to adapt to the test specimen to be measured of different spans, that is, forms movable hinged shoe；Work as crossbeam
(13) when producing to bottom offset, by adjusting to movable hinged shoe, crossbeam (13) integrally still keeps level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162302.4A CN106644692B (en) | 2016-12-15 | 2016-12-15 | Device for determining concrete creep test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611162302.4A CN106644692B (en) | 2016-12-15 | 2016-12-15 | Device for determining concrete creep test |
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| Publication Number | Publication Date |
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| CN106644692A true CN106644692A (en) | 2017-05-10 |
| CN106644692B CN106644692B (en) | 2020-01-24 |
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| CN201611162302.4A Expired - Fee Related CN106644692B (en) | 2016-12-15 | 2016-12-15 | Device for determining concrete creep test |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870126A (en) * | 2017-10-11 | 2018-04-03 | 太原理工大学 | New concrete compression column and armored concrete are by camber beam creep test device |
| CN108169002A (en) * | 2017-12-22 | 2018-06-15 | 云南民族大学 | A kind of reduced scale test model and method for testing steel-concrete composite beam Creep Characteristics |
| CN109060555A (en) * | 2018-09-03 | 2018-12-21 | 清华大学 | A kind of concrete creep test device and analysis method based on four-point bending load |
| CN109668793A (en) * | 2019-01-09 | 2019-04-23 | 山东科技大学 | Simulate the device and method of Dynamic And Static Loads Under Concrete spray-up mechanical property |
| CN110658066A (en) * | 2019-10-12 | 2020-01-07 | 北京工业大学 | Axial compression test device for cross beam structure |
| CN111521494A (en) * | 2020-05-12 | 2020-08-11 | 河北工业大学 | Rock bending strength tester under action of uniformly distributed loads |
| CN114527015A (en) * | 2022-02-14 | 2022-05-24 | 哈尔滨工业大学 | Pure torsion creep test device suitable for various sizes of combined components and test method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LV15659B (en) * | 2020-12-28 | 2023-05-20 | Rīgas Tehniskā Universitāte | Method for determination of long-term properties of concrete and cement composites in various stress conditions |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107870126A (en) * | 2017-10-11 | 2018-04-03 | 太原理工大学 | New concrete compression column and armored concrete are by camber beam creep test device |
| CN107870126B (en) * | 2017-10-11 | 2019-11-12 | 太原理工大学 | New concrete compression column and armored concrete are by camber beam creep test device |
| CN108169002A (en) * | 2017-12-22 | 2018-06-15 | 云南民族大学 | A kind of reduced scale test model and method for testing steel-concrete composite beam Creep Characteristics |
| CN109060555A (en) * | 2018-09-03 | 2018-12-21 | 清华大学 | A kind of concrete creep test device and analysis method based on four-point bending load |
| CN109060555B (en) * | 2018-09-03 | 2020-07-21 | 清华大学 | Concrete creep testing device and analysis method based on four-point bending loading |
| CN109668793A (en) * | 2019-01-09 | 2019-04-23 | 山东科技大学 | Simulate the device and method of Dynamic And Static Loads Under Concrete spray-up mechanical property |
| CN110658066A (en) * | 2019-10-12 | 2020-01-07 | 北京工业大学 | Axial compression test device for cross beam structure |
| CN110658066B (en) * | 2019-10-12 | 2022-01-28 | 北京工业大学 | Axial compression test device for cross beam structure |
| CN111521494A (en) * | 2020-05-12 | 2020-08-11 | 河北工业大学 | Rock bending strength tester under action of uniformly distributed loads |
| CN114527015A (en) * | 2022-02-14 | 2022-05-24 | 哈尔滨工业大学 | Pure torsion creep test device suitable for various sizes of combined components and test method thereof |
| CN114527015B (en) * | 2022-02-14 | 2023-11-10 | 哈尔滨工业大学 | Pure torsion creep test device suitable for multiple-size combined components and test method thereof |
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