CN107941847A - A kind of test device and method for the deformation of cement concrete early stage frost heave - Google Patents
A kind of test device and method for the deformation of cement concrete early stage frost heave Download PDFInfo
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- CN107941847A CN107941847A CN201711021515.XA CN201711021515A CN107941847A CN 107941847 A CN107941847 A CN 107941847A CN 201711021515 A CN201711021515 A CN 201711021515A CN 107941847 A CN107941847 A CN 107941847A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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Abstract
The present invention relates to a kind of test device and method for the deformation of cement concrete early stage frost heave.Mainly solving the problems, such as existing method, there are test result big low precision influenced by ambient temperature.It is characterized in that：Described hawser one end lies in hermetic bag upper port, and the other end is connected to container B upper end by pulley；Container B lower part is immersed in below the water surface in container C.The test method includes：Hermetic bag is put into freezing liquid；Continue to add fine sand into container B, the top of container B and hermetic bag is in identical height, writes down the liquid level of water in container C；When the buoyancy value added that container B produces in container C is equal with buoyancy value added caused by hermetic bag expansion, concrete is conversed by the water scale value H monitored in container C the differences changed over time and freezes caused volumetric expansion amount.The test method evaluates freeze injury degree of injury by monitoring concrete early stage frost heave amount, monitors concrete in real time and endures cold the deformation of volume, and precision is high.
Description
Technical field
The present invention relates to engineering material applied technical field, more particularly to a kind of cement concrete early stage frost heave that is used for deform
Test device and method.
Background technology
Cement concrete is current the most widely used civil engineering material, and mechanical strength is to influence with volume stability
The most important performance indicator of this kind of material engineering application.It is well known that it is due to wherein that why concrete, which has higher-strength,
Cement granules and water hydration reaction occurs, and hydrated reaction of cement needs the presence of liquid water and long period maintenance to reach
To design strength requirement；Meanwhile even if there is the presence of liquid water under cold environmental conditions, hydrated reaction of cement speed also can be notable
Reduce, gain in strength is slow.Therefore, drastically decline without precuring, precuring time deficiency, temperature when fresh concrete is in
When being subject to the low temperature environment to act under the conditions of, it can largely freeze since water mudrock structure not yet forms to cause to exist in concrete completely
The Free water of knot, and the relatively low expansive force for being insufficiently resistant to Free water and freezing to produce of cement strength, will cause concrete
Middle microcrack forms extension and influences concrete strength and long-term behaviour development.Destroyed to prevent concrete early freezc, greatly
Quantity research accelerates hydrated cementitious and intensity to send out with mainly reducing the freezing point of water by mixing antifreezing agent in practical application, mixing early strength agent
Exhibition, external insulation maintenance or be additionally provided heat source to avoid or delay concrete in Free water the measure such as freeze and taken precautions against.I.e.
Just in this way, also can usually occur the phenomenon of concrete early freezc destruction in practical engineering application, therefore prevention early freezing ruin is
The important subject in severe cold area concrete material field.Comprehensive national standard and pertinent literature, are generally adopted at present both at home and abroad
Changed etc. with the compression strength loss rate, propagation speed of ultrasonic waves and dynamic modulus of elasticity that continue standard curing concrete after enduring cold and surveyed
Adverse effect of the method for testing with metrics evaluation early freezing ruin to concrete.These evaluation methods there are test process it is cumbersome, experiment
Heavy workload, test period be long, test result is influenced the deficiencies of big and precision is poor by experimental implementation person and experimental situation condition
Part.Meanwhile from the Analysis on Mechanism of concrete early freezing ruin, the volume during mainly being endured cold by freeze injury degree with concrete is swollen
Bulk is directly related, thus can evaluate freeze injury extent of the destruction by monitoring concrete early freezc cubical expansivity, at present
It at home and abroad there is no the test method on this respect.
The content of the invention
There is test the invention reside in current concrete early freezing ruin damage measure method present in background technology is overcome
Process is cumbersome, test result by experimental implementation person and ambient temperature effect be big and the problem of precision is poor, so as to provide a kind of use
In the test device of cement concrete early stage frost heave deformation.This is used for the test device of cement concrete early stage frost heave deformation, can
Endure cold the test of cubic deformation for monitoring concrete in real time, it is easy to operate, quick, precision is high.The present invention also provides one kind
Test method for the deformation of cement concrete early stage frost heave.
The present invention solves the problems, such as that it can reach by following technical solution：One kind is used for cement concrete early stage frost heave and becomes
The test device of shape, including container, the container are the double container with cavity, and freezing liquid is housed in container, in freezing liquid
Rubber seal bag is equipped with, the concrete sample of test is housed in rubber seal bag；The upper and lower part of container outer wall is respectively equipped with
Inlet valve and outlet valve, the top of container are equipped with sealing cover；The center position of sealing cover is equipped with circular hole, is installed with hole
Hawser, hawser one end are lain at the upper port of rubber seal bag；The hawser other end is connected to container B by pulley A, pulley B
Upper end；Pulley A, pulley B are fixed on cross bar lower part by two connecting rod horizontal parallels respectively, and one end of cross bar is connected on montant
End, montant lower end are fixed on bottom plate, and container C, container A are equipped with bottom plate；Container B lower part is immersed in below the water surface in container C.
The present invention also provides a kind of test method for being used for cement concrete frost-heaving deformation under different temperatures, including following step
Suddenly：
1）The concrete sample of test is fitted into flexible rubber dam bag, and rocks repeatedly and ensures concrete and rubber seal
Bag inner wall is come into full contact with without forming air layer, and the concrete sample of test pricks rubber seal bag inlet with steel wire after filling
Tightly, outside air and solution is made to completely cut off completely with concrete sample；It is placed on stand-by in thermostatic chamber；
2）Inlet valve on container A outer wall and outlet valve are connected with subzero temperature insulating box respectively, make the fluid media (medium) of design temperature
Circulated in the cavity of container A；Load the freezing liquid of design temperature in the inner cylinder of container A；
3）The quality of the flexible rubber dam bag equipped with concrete sample is weighed, and one end of hawser is fixed on the upper of hermetic bag
Portion, the sand of certain mass is loaded in container B, makes the quality summation of sand and container B equivalent to equipped with concrete sample
Quality of the flexible sealing bag in freezing liquid；
4）After concrete reaches certain curing time, the flexible rubber dam bag equipped with concrete is slowly put into freezing liquid
In, and hawser is passed through into circular hole, around pulley A, pulley B, the other end of hawser is fixedly arranged at equipped with a certain amount of sand
The top of container B, closes sealing cover；
5）Continue to add fine sand into container B, until the hawser that pulley A and pulley B lower parts link is of substantially equal, namely container B
Identical height is in the top of rubber seal bag, the liquid level for recording water in container C at this time is H0；
6）With the extension of the soaking time in freezing liquid of the hermetic bag equipped with concrete, the Free water in concrete pore is gradual
Start freezing expansion, cause the apparent volume of the rubber seal bag of flexibility to become larger, cause buoyancy suffered by rubber seal bag to increase
Float greatly, thus hawser is slowly deviated to container B side；
7）When container B is sunk in the container C equipped with water, its suffered buoyancy also increases therewith, when what container B sinking produced floats
When power value added is equal with buoyancy value added caused by the expansion of rubber seal bag, two pulley both sides return to equilibrium-like again
State；
8）Changed over time, passed through by the water scale value H monitored in container CH-H 0Difference can converse concrete and freeze institute
The volumetric expansion amount of generation is：△V=(H-H0)* A1*ρWater/ρIt is cold, wherein A1For the cross-sectional area of container C, ρWater、ρIt is coldRespectively water
With the density of freezing liquid.
It is of the invention to be had the advantages that compared with above-mentioned background technology：It is using the present invention to be used for coagulating cement
The test device and method of native early stage frost heave deformation, can accurately and easily measure and not yet condense or have certain mechanical strength
Macroscopical volume deformation process and final volume change rate of the different mixture ratio concrete when enduring cold under different subzero temperature environment.Should
Chilled liquid temperature can arbitrarily be set in test process, concrete is in the permanent subzero temperature environment set in whole test process
In without being disturbed, available for experimental study and simulation actual temperature environmental testing.The test device operation principle is simple, surveys
It is high, easy to operate, applied widely to try precision.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention.
In figure：1st, container A；2nd, freezing liquid；3rd, sealing cover；4th, inlet valve；5th, outlet valve；6th, temperature sensor；7th, rubber
Hermetic bag；8th, concrete sample to be measured；9th, hole；10th, bottom plate；11st, montant；12nd, cross bar；13rd, pulley A；14th, pulley B；15、
Hawser；16th, container B；17th, container C；18th, graduation mark.
Embodiment：
The invention will be further described below in conjunction with the accompanying drawings and the specific embodiments：
As shown in Figure 1, a kind of test device for the deformation of cement concrete early stage frost heave, including container A 1, the container A 1
For the double container with cavity, container A 1 is interior to be equipped with freezing liquid 2, and rubber seal bag 7, rubber seal bag 7 are equipped with freezing liquid 2
The interior concrete sample 8 equipped with test；Mounting temperature sensor 6 on 1 inner wall of container A；The upper and lower part of 1 outer wall of container A
Inlet valve 4 and outlet valve 5 are respectively equipped with, the top of container A 1 is equipped with sealing cover 3, and the center position of sealing cover 3 is equipped with circle
Hole 9, is installed with hawser 15 in hole 9,15 one end of hawser is lain at the upper port of rubber seal bag 7；15 other end of hawser passes through
Pulley A13, pulley B14 are connected to the upper end of container B 16；Pulley A13, pulley B14 pass through two connecting rod horizontal parallels respectively
12 lower part of cross bar is fixed on, one end 11 upper end of connection montant of cross bar 12,11 lower end of montant is fixed on bottom plate 10, on bottom plate 10
It is equipped with container C17, container A 1；The water of certain altitude is housed, container C17 is placed in parallel with container A 1 in container C17；Container C17
Side be equipped with graduation mark 18,16 low portion of container B is highly immersed in below the water surface in container C17；The container A 1
Outer wall is plastic material, and inner wall is metal material, and hawser 15 is high-strength finer wire material；The concrete sample 8 of test is stirring
Good cement concrete mix.
Double sheet container A1 with cavity is placed on the bottom plate 10 of device, and the upper and lower part of container A 1 is respectively equipped with
Inlet valve 4 and outlet valve 5, by being connected respectively with cryostat outer circulation outlet with import, make the freezing liquid of design temperature
Circulated in cavity between 1 inside and outside wall of container A, ensure 2 constant temperature of freezing liquid contained in container A 1.Double wall holds
The outer wall of device A1 is made for the relatively low plastic material of thermal conductivity factor to reduce the heat circulated between cold liquid and exterior ambient environment
Exchange；Inner wall is then to cause the higher metal material of coefficient, to ensure that being rapidly achieved heat between freezing liquid 2 and the cold liquid of circulation puts down
Weighing apparatus.The top of container A 1 is equipped with the sealing cover 3 that can open, close, and when opening is easy to be put into concrete sample, to ensure during closing
The constant temperature of freezing liquid 2；Circular hole 9 is equipped with the center position of sealing cover 3 at the same time, is passed freely through easy to hawser 15.
The concrete sample 8 of test is sealed in the rubber seal bag 7 prepared by flexible material, ensures that concrete can be free after enduring cold
Deform and acted on from external constraint, the upper end of rubber seal bag 7, which tightens, to be sealed and be connected with one end of hawser 15；Hawser 15 is
High-strength finer wire material, hawser 15 are connected to container B 16 through circular hole 9, by pulley A13, pulley B14, the other end
Upper end；11 lower end of montant is fixed on bottom plate 10, and upper end is connected with one end of cross bar 12；Pulley A13, pulley B14 pass through respectively
Two connecting rods are fixed on 12 lower part of cross bar；The water of certain altitude, and placement of aliging with 1 axis of container A are housed in container C17
On bottom plate 10, the side of container C17 is equipped with graduation mark 18,16 Partial Height of container B be immersed in the water surface in container C17 with
Under.
It is using the test method for the test device of cement concrete early stage frost heave deformation：
1）The cement concrete mix being stirred is fitted into flexible rubber dam bag 7, and repeatedly rock ensure concrete with
Rubber seal bag inner wall is come into full contact with without forming air layer, concrete mix fill after by rubber seal bag inlet steel
Silk tightens, and outside air and solution is completely cut off completely with concrete sample；It is placed on stand-by in thermostatic chamber；
2）Inlet valve 4 on 1 outer wall of container A and outlet valve 5 are connected with subzero temperature insulating box respectively, the fluid of design temperature is situated between
Matter circulates in the cavity of container A 1；Load the freezing liquid 2 of design temperature in the inner cylinder of container A 1；
3）The quality of the flexible rubber dam bag 7 equipped with concrete sample is weighed, and one end of hawser 15 is fixed on hermetic bag 7
Top, in container B 16 load certain mass sand, make sand and the quality summation of container B 16 substantially correspond to be equipped with
Quality of the flexible sealing bag 7 of concrete sample in liquid is frozen；
4）After concrete reaches certain curing time, the flexible rubber dam bag 7 equipped with concrete is slowly put into freezing
In liquid 2, and hawser 15 is passed through into circular hole 9, around pulley A13, pulley B14, the other end of hawser is fixedly arranged at equipped with one
Determine the top of the container B 16 of sand, close sealing cover 3；
5）Continue to add fine sand into container B 16, until the hawser that pulley A13 and pulley B14 lower parts link is of substantially equal, namely
The top of container B 16 and rubber seal bag 7 is in identical height, and the liquid level for recording water in container C17 at this time is H0；
6）With the extension of the soaking time in freezing liquid of the hermetic bag equipped with concrete, the Free water in concrete pore is gradual
Start freezing expansion, cause the apparent volume of the rubber seal bag 7 of flexibility to become larger, cause buoyancy suffered by rubber seal bag 7
Increase and float, thus hawser is slowly deviated to 16 side of container B；
7）When container B 16 is sunk in the container C17 equipped with water, its suffered buoyancy also increases therewith, when container B 16 sinks to producing
Raw buoyancy value added and rubber seal bag 7 expand caused by buoyancy value added it is equal when, two pulley both sides return to again
Equilibrium state；
8）Therefore, changed over time, passed through by the water scale value H monitored in container C17H-H 0Difference can converse coagulation
Soil freezes caused volumetric expansion amount：△V=(H-H0)* A1*ρWater/ρIt is cold, wherein A1For the cross-sectional area of container C17, ρWater、
ρIt is coldThe respectively density of water and freezing liquid.
Test device and method using the present invention for the deformation of cement concrete early stage frost heave, can be accurate and convenient
It is grand when ground measure not yet condenses or the different mixture ratio concrete with certain mechanical strength is endured cold under different subzero temperature environment
See cubic deformation process and final volume change rate.Chilled liquid temperature can arbitrarily set, entirely test in the test process
Without being disturbed in the permanent subzero temperature environment that concrete is in setting in journey, available for experimental study and simulation actual temperature
Environmental testing.The test device operation principle is simple, measuring accuracy is high, easy to operate, applied widely.
Claims (7)
1. a kind of test device for the deformation of cement concrete early stage frost heave, including container A（1）, it is characterised in that：The appearance
Device A（1）For the double container with cavity, container A（1）It is interior that freezing liquid is housed（2）, freezing liquid（2）In be equipped with rubber seal bag
（7）, rubber seal bag（7）The interior concrete sample (8) equipped with test；Container A（1）The upper and lower part of outer wall be respectively equipped with into
Mouth valve（4）And outlet valve（5）, container A（1）Top be equipped with sealing cover（3）；Sealing cover（3）Center position be equipped with circle
Hole（9）, hole（9）Inside it is installed with hawser（15）, hawser（15）One end lies in rubber seal bag（7）Upper port at；Hawser
（15）The other end passes through pulley A（13）, pulley B（14）It is connected to container B（16）Upper end；Pulley A（13）, pulley B（14）Point
Cross bar is not fixed on by two connecting rod horizontal parallels（12）Lower part, cross bar（12）One end connection montant（11）Upper end, is erected
Bar（11）Lower end is fixed on bottom plate（10）On, bottom plate（10）On be equipped with container C（17）, container A（1）；Container B（16）Lower part is immersed in
Container C（17）In the water surface below.
A kind of 2. test device for the deformation of cement concrete early stage frost heave according to claim 1, it is characterised in that：
The container C（17）In water, container C are housed（17）With container A（1）It is placed in parallel.
A kind of 3. test device for the deformation of cement concrete early stage frost heave according to claim 1, it is characterised in that：
The container C（17）Side be equipped with graduation mark（18）.
A kind of 4. test device for the deformation of cement concrete early stage frost heave according to claim 1, it is characterised in that：
The container A（1）Mounting temperature sensor on inner wall（6）.
A kind of 5. test device for the deformation of cement concrete early stage frost heave according to claim 1, it is characterised in that：
The container A（1）Outer wall be plastic material, inner wall is metal material, hawser（15）For high-strength finer wire material.
6. a kind of test method of test device for being used for the deformation of cement concrete early stage frost heave using described in claim 1,
It is characterized in that：Comprise the following steps：
1）The concrete sample (8) of test is loaded into flexible rubber dam bag（7）In, and rock repeatedly and ensure concrete and rubber
Hermetic bag inner wall is come into full contact with without forming air layer, the concrete sample (8) of test fill after by rubber seal bag inlet
Tightened with steel wire, outside air and solution is completely cut off completely with concrete sample；It is placed on stand-by in thermostatic chamber；
2）By container A（1）Inlet valve 4 and outlet valve 5 on outer wall are connected with subzero temperature insulating box respectively, make the fluid of design temperature
Medium is in container A（1）Cavity in circulate；In container A（1）Inner cylinder in load design temperature freezing liquid（2）；
3）Weigh the flexible rubber dam bag equipped with concrete sample（7）Quality, and by hawser（15）One end be fixed on it is close
Envelope（7）Top, in container B（16）The middle sand for loading certain mass, makes sand and container B（16）Quality summation it is suitable
In the flexible sealing bag equipped with concrete sample（7）Quality in freezing liquid；
4）After concrete reaches certain curing time, by the flexible rubber dam bag equipped with concrete（7）Slowly it is put into cold
Freeze liquid（2）In, and by hawser（15）Through circular hole（9）, around pulley A（13）, pulley B（14）, by the other end of hawser
It is fixedly arranged at the container B equipped with certain sand（16）Top, close sealing cover（3）；
5）Continue to container B（16）Middle addition fine sand, until pulley A（13）With pulley B（14）The basic phase of hawser that lower part links
Deng, namely container B（16）With rubber seal bag（7）Top be in identical height, record container C at this time（17）The liquid of middle water
Face is highly H0；
6）With the extension of the soaking time in freezing liquid of the hermetic bag equipped with concrete, the Free water in concrete pore is gradual
Start freezing expansion, cause the rubber seal bag of flexibility（7）Apparent volume become larger, cause rubber seal bag（7）It is suffered
Buoyancy increases and floats, thus hawser is to container B（16）Side slowly deviates；
7）Work as container B（16）In the container C equipped with water（17）During middle sinking, its suffered buoyancy also increases therewith, works as container B（16）
Sink the buoyancy value added produced and rubber seal bag（7）When buoyancy value added is equal caused by expansion, two pulley both sides
Equilibrium state is returned to again；
8）Therefore, by monitoring container C（17）In water scale value H change over time, pass throughH-H 0Difference can converse coagulation
Soil freezes caused volumetric expansion amount：△V=(H-H0)* A1*ρWater/ρIt is cold, wherein A1For container C（17）Cross-sectional area,
ρWater、ρIt is coldThe respectively density of water and freezing liquid.
7. the test method according to claim 6 for the deformation of cement concrete early stage frost heave, it is characterised in that：It is described
Step（1）The concrete sample (8) of middle test is the cement concrete mix being stirred.
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| CN201711021515.XA CN107941847A (en) | 2017-10-27 | 2017-10-27 | A kind of test device and method for the deformation of cement concrete early stage frost heave |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614095A (en) * | 2018-05-15 | 2018-10-02 | 河海大学 | A kind of test device of test method and the frost heave strain of unsaturation porous asphalt mixture freezing and thawing performance |
| CN110146686A (en) * | 2019-05-21 | 2019-08-20 | 哈尔滨工业大学 | A kind of concrete is endured cold device for detecting deformation and its detection method |
| CN110988019A (en) * | 2019-12-16 | 2020-04-10 | 中国石油大学(北京) | Testing device and testing method for shale thermal expansion coefficient |
| CN112098454A (en) * | 2020-09-21 | 2020-12-18 | 哈尔滨工业大学 | Asphalt mixture freezing point determination method based on volume expansion |
| CN115951040A (en) * | 2023-02-20 | 2023-04-11 | 中铁建设建筑发展(海南)有限公司 | Concrete shrinkage experimental device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108614095A (en) * | 2018-05-15 | 2018-10-02 | 河海大学 | A kind of test device of test method and the frost heave strain of unsaturation porous asphalt mixture freezing and thawing performance |
| CN110146686A (en) * | 2019-05-21 | 2019-08-20 | 哈尔滨工业大学 | A kind of concrete is endured cold device for detecting deformation and its detection method |
| CN110988019A (en) * | 2019-12-16 | 2020-04-10 | 中国石油大学(北京) | Testing device and testing method for shale thermal expansion coefficient |
| CN112098454A (en) * | 2020-09-21 | 2020-12-18 | 哈尔滨工业大学 | Asphalt mixture freezing point determination method based on volume expansion |
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| CN115951040A (en) * | 2023-02-20 | 2023-04-11 | 中铁建设建筑发展(海南)有限公司 | Concrete shrinkage experimental device |
| CN115951040B (en) * | 2023-02-20 | 2024-06-04 | 中铁建设建筑发展(海南)有限公司 | Concrete shrinkage experimental device |
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Application publication date: 20180420 |