CN207423965U - A kind of test device for the deformation of cement concrete early stage frost heave - Google Patents
A kind of test device for the deformation of cement concrete early stage frost heave Download PDFInfo
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- CN207423965U CN207423965U CN201721408178.5U CN201721408178U CN207423965U CN 207423965 U CN207423965 U CN 207423965U CN 201721408178 U CN201721408178 U CN 201721408178U CN 207423965 U CN207423965 U CN 207423965U
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Abstract
The utility model is related to a kind of test devices for the deformation of cement concrete early stage frost heave.Mainly solving the problems, such as existing method, there are test result big low precisions influenced by ambient temperature.It is characterized in that：The container A is the double container with cavity, and rubber seal bag is equipped in the freezing liquid being equipped in container A, concrete sample is housed in rubber seal bag；The upper and lower part of container A outer wall is equipped with import and export valve respectively；Circular hole is equipped at sealing cover center, is installed with hawser in hole, hawser one end is lain at the upper port of rubber seal bag；The hawser other end is connected to the upper end of container B by pulley A, B；Pulley A, B are fixed on cross bar lower part by the way that two connecting rods are parallel respectively, and one end of cross bar connects montant upper end, and montant lower end is fixed on bottom plate, and container B lower part is immersed in below the water surface in container C.The device 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 utility model is related to engineering material applied technical fields more particularly to one kind to be used for cement concrete early stage frost heave
The test device of deformation.
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 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 that could reach
To design strength requirement；Meanwhile even if there is the presence of liquid water under cold environmental conditions, hydrated reaction of cement rate also can be notable
It reduces, 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, can largely it freeze since water mudrock structure not yet forms to cause to exist in concrete completely
The Free water of knot, and the relatively low Free water that is insufficiently resistant to of cement strength freezes the expansive force generated, will cause concrete
Middle microcrack forms extension and influences concrete strength and long-term behaviour development.It is 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 measures such as freeze and taken precautions against.I.e.
Just in this way, also can usually occur the phenomenon that 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
The surveys such as change with the compression strength loss rate, propagation speed of ultrasonic waves and dynamic modulus of elasticity that continue standard curing concrete after enduring cold
Method for testing is with metrics evaluation early freezing ruin to the adverse effect of 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
At home and abroad there is no the test devices used in the test method on this respect.
The content of the invention
The utility model lies in that current concrete early freezing ruin damage measure device present in background technology is overcome to exist
Test 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 one
The test device that kind deforms for cement concrete early stage frost heave.The test dress deformed for cement concrete early stage frost heave
It puts, can be used for monitoring concrete in real time and endure cold the test of cubic deformation, it is easy to operate, quick, precision is high.
The invention for solving the technical problem can reach by following technical solution：One kind is frozen for cement concrete early stage
The test device of bulging deformation, including container, the container is the double container with cavity, and freezing liquid, freezing are housed in container
Rubber seal bag is equipped in liquid, the concrete sample of test is housed in rubber seal bag；The upper and lower part difference of container outer wall
Equipped with inlet valve and outlet valve, the top of container is equipped with sealing cover；The center position of sealing cover is equipped with circular hole, in hole
Hawser is installed with, hawser one end is lain at the upper port of rubber seal bag；The hawser other end is connected to container by pulley A, pulley B
The upper end of B；Pulley A, pulley B are fixed on cross bar lower part by two connecting rod horizontal parallels respectively, and one end connection of cross bar is perpendicular
Bar upper end, montant lower end are fixed on bottom plate, and container C, container A are equipped on bottom plate；Container B lower part is immersed in the water surface in container C
Below.
The utility model can have the advantages that compared with above-mentioned background technology：Using being used for for the utility model
The test device of cement concrete early stage frost heave deformation can be measured accurately and easily and not yet condensed or with certain mechanical strong
Macroscopical volume deformation process and final volume change rate when the different mixture ratio concrete of degree is endured cold under different subzero temperature environment.
Chilled liquid temperature can arbitrarily be set in the test process, concrete is in the permanent subzero temperature ring set in entire test process
Without being disturbed in border, 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.
Description of the drawings
Fig. 1 is the structure diagram of the utility model.
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.
Specific embodiment：
The utility model is described in further detail 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 appearance
Device A1 is the double container with cavity, and freezing liquid 2 in container A 1 is housed, is equipped with rubber seal bag 7 in freezing liquid 2, rubber is close
Concrete sample 8 equipped with test in envelope 7；Mounting temperature sensor 6 on 1 inner wall of container A；The top of 1 outer wall of container A
Inlet valve 4 and outlet valve 5 are respectively equipped with lower part, the top of container A 1 is equipped with sealing cover 3, and the center position of sealing cover 3 is set
There is circular hole 9, hawser 15 is installed in hole 9,15 one end of hawser is lain at the upper port of rubber seal bag 7；Hawser 15 is another
End is connected to the upper end of container B 16 by pulley A13, pulley B14；Pulley A13, pulley B14 pass through two connecting rod water respectively
Average row is fixed on 12 lower part of cross bar, one end 11 upper end of connection montant of cross bar 12, and 11 lower end of montant is fixed on bottom plate 10, bottom
Container C17, container A 1 are equipped on plate 10；The water of certain altitude is housed, container C17 is placed in parallel with container A 1 in container C17；Hold
The side of device C17 is equipped with graduation mark 18, and 16 low portion of container B is highly immersed in below the water surface in container C17；The container
The outer wall of A1 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
The cement concrete mix being stirred.
Double-walled 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
It is circulated in cavity between 1 inside and outside wall of container A, ensures 2 constant temperature of freezing liquid contained in container A 1.Double wall holds
The outer wall of device A1 is made to reduce the heat cycled between cold liquid and exterior ambient environment for the relatively low plastic material of thermal conductivity factor
It exchanges；Inner wall is then the metal material for causing coefficient higher, to ensure that being rapidly achieved heat between freezing liquid 2 and the cold liquid of Xun Huan 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 convenient for being put into concrete sample, to ensure during closing
The constant temperature of freezing liquid 2；Circular hole 9 is equipped in the center position of sealing cover 3 simultaneously, is passed freely through convenient for 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
It deforms and is 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 pass through circular hole 9, by pulley A13, pulley B14, and the other end is connected to container B 16
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 rocks guarantee coagulation repeatedly
Soil and rubber seal bag inner wall are come into full contact with without forming air layer, concrete mix fill after by rubber seal bag inlet
It is tightened with steel wire, outside air and solution is made to completely cut off completely with concrete sample；It is placed in thermostatic chamber for use；
2）Inlet valve 4 on 1 outer wall of container A and outlet valve 5 with subzero temperature insulating box are connected respectively, make the stream of design temperature
Body medium circulates in the cavity of container A 1；The freezing liquid 2 of design temperature is packed into 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 close
The top of envelope 7 is packed into the sand of certain mass in container B 16, substantially corresponds to sand and the quality summation of container B 16
Quality of the flexible sealing bag 7 equipped with 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
In freezing liquid 2, and the other end of hawser, around pulley A13, pulley B14, is fixedly arranged at dress by hawser 15 through circular hole 9
There is the top of the container B 16 of certain sand, close sealing cover 3；
5）Continue to add in 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, 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
Gradually start freezing expansion, the apparent volume of flexible rubber seal bag 7 is caused to become larger, is caused suffered by rubber seal bag 7
Buoyancy increases and floats, thus hawser is slowly deviated to 16 one side of container B；
7）When container B 16 is sunk in the container C17 equipped with water, suffered buoyancy also increases therewith, when under container B 16
When the heavy buoyancy value added generated is equal with buoyancy value added caused by rubber seal bag 7 expands, two pulley both sides and extensive
Equilibrium state is arrived again；
8）Therefore, changed over time, passed through by the water scale value H monitored in container C17H-H 0Difference can converse
Concrete freezes generated volume 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.
Using the utility model for the test device and method of the deformation of cement concrete early stage frost heave, can accurately and
When easily measuring not yet condensation or there is the different mixture ratio concrete of certain mechanical strength to endure cold under different subzero temperature environment
Macroscopical volume deformation process and final volume change rate.Chilled liquid temperature can arbitrarily set, entirely survey in the test process
Concrete is in the permanent subzero temperature environment set without being disturbed during examination, actual available for experimental study and simulation
Temperature environment is tested.The test device operation principle is simple, measuring accuracy is high, easy to operate, applied widely.
Claims (4)
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）To carry the double container of 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.
2. a kind of 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 equipped with water, container C（17）With container A（1）It is placed in parallel.
3. a kind of 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）.
4. a kind of 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）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721408178.5U CN207423965U (en) | 2017-10-27 | 2017-10-27 | A kind of test device for the deformation of cement concrete early stage frost heave |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721408178.5U CN207423965U (en) | 2017-10-27 | 2017-10-27 | A kind of test device for the deformation of cement concrete early stage frost heave |
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| Publication Number | Publication Date |
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| CN207423965U true CN207423965U (en) | 2018-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202100004205A1 (en) * | 2021-02-23 | 2022-08-23 | C3 Concrete Cube Certainty S R L | IMPROVED CONSTRUCTION CUBIERA |
-
2017
- 2017-10-27 CN CN201721408178.5U patent/CN207423965U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT202100004205A1 (en) * | 2021-02-23 | 2022-08-23 | C3 Concrete Cube Certainty S R L | IMPROVED CONSTRUCTION CUBIERA |
| WO2022180502A1 (en) * | 2021-02-23 | 2022-09-01 | C3 Concrete Cube Certainty S.R.L. | Upgraded building mould |
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