CN108241051A - The test device and test method of a kind of early age self-constriction of cement-based material - Google Patents
The test device and test method of a kind of early age self-constriction of cement-based material Download PDFInfo
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- CN108241051A CN108241051A CN201711361296.XA CN201711361296A CN108241051A CN 108241051 A CN108241051 A CN 108241051A CN 201711361296 A CN201711361296 A CN 201711361296A CN 108241051 A CN108241051 A CN 108241051A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The invention discloses the test devices and test method of a kind of early age self-constriction of cement-based material.Device of the present invention includes magnetic suction disc, non-contact displacement transducer, bellow mold, test bracket, bellows encapsulation end, chain sling, buffering pressure air-pocket, plastic tube and rubber stopper；The test bracket includes pendant bar, fixed link, left plate and right plate；The left plate is equipped with magnetic suction disc fixing groove, and the right plate is equipped with non-contact displacement transducer fixing groove；The buffering pressure air-pocket, plastic tube, venthole form the internal structure connected with bellow mold；The chain sling includes hook and wire chain.The present invention realizes the accurate test of the early age self-constriction deformation of cement-based material, test method science, it is reliable, stablize, there is preferable repeatability.The technical method of the present invention is also suitable for the self-constriction deformation test of other cementitious materials.
Description
Technical field
The present invention relates to cement-based material technical field of measurement and test, and in particular to a kind of early age self-constriction of cement-based material
Test device and test method.
Background technology
Cement is a kind of powdery inorganic cementitious material, is defined as：It is all be finely ground into it is powdered, can be into after adding in suitable quantity of water
For plasticity slurry, it can harden and harden in water in air, and can be cemented together securely by materials such as sand, stones
Hydraulic cementing materials, be referred to as cement.The problem of cement-based material is due to self-characteristic can be produced from contraction distortion, because
This, self-constriction is deformed into the important parameter for cement-based material research and in applying, and test device and test method are also more
It is kind various, but the technical method being commonly recognized at present be by the deflection of the deformation characterization overall deformation of length direction or
Deformation rate.
Although there are many technical methods of self-constriction deformation test, in scientific research field, by operability and can realize
Property aspect say, ripple tube method was widely recognized as a kind of one of relatively reasonable test method, the present inventor Tian Qian once
Exist in the JENSEN Ole Mejlhede of 2009 and Denmark University of Science and Technology《Silicate journal》On delivered " using bellows
Test cement-based material Early self-shrinkage method ", discuss reliability and theoretical foundation that ripple tube method is tested, the same year, the survey
Method for testing is used by Unite States Standard ASTM C1698, and the pretty grade in field has also declared patent " CN200610038892.X concrete early stage
Self-deformation test method and device ", the patented technology realize the condensing self-desiccation with after concrete initial set of concrete and receive
The test of contracting；One of the present inventor Zhang Jianliang has done further improvement to the test device of ripple tube method, obtains
Patent " CN201420842970.1 bellowss encapsulate end and use its cement-based material self-constriction measurement device ", but still
There are early deformation, the problems such as especially initial set to final setting time section, test repeatability is bad, data fluctuations are big, cause
Caused by one of the reason of the problem being exactly now the friction of test piece mould and stent, including current standard GB/T/T 50082-
The eyes with non-contact method of concrete shrinkage deformation in 2009 " Standard for test methods of longterm performance and durability of ordinary concrete standards " is also
There are similar problems, for time mold to bottom and the equal Constrained of surrounding, therefore in academia, this method still has some disputes.
During using bellow mold, bellows interior sealing when cement-based material generates contraction or expansion deformation, promotes ripple pipe die
Tool generates deformation, leads to the air pressure change in bellows, so as to which bellow mold be made to generate certain constraint to cement-based material
Power, this restraining force especially before and after pouring molding to final set, are produced bigger effect, are led to cement-based material early deformation
Cause early stage test result inaccurate, the form of expression fluctuates big, poor repeatability for test result.
In summary, existing technical method can not accurately, reliably test the Early self-shrinkage change of cement-based material
Shape, therefore, the present invention propose the test device and test method of a kind of early age self-constriction of cement-based material, well solve
This problem.
Invention content
Cause the test of cement-based material early deformation inaccurate in order to solve bellow mold and test bracket friction with
And the variation of bellow mold length leads to problems such as internal pressure change and had an impact to early deformation, the present invention provides one
The test device and test method of the early age self-constriction of kind cement-based material, realize bellow mold and rub with test bracket zero
It wipes, realizes bellow mold internal pressure and be consistently equal to external atmosphere pressure, complex art effect can realize that cement-based material pours
Accurate, the repeatable test that the type of building up deforms after starting to final set in 24 hours.
Specifically it is realized in：
The present invention provides a kind of test device of the early age self-constriction of cement-based material, including magnetic suction disc and non-contact
Formula displacement sensor, bellow mold, test bracket, bellows encapsulation end, chain sling, buffering pressure air-pocket, plastic tube and rubber stopper；
The bellow mold stretch in a free state 3mm and compress 3mm used in power no more than 20mN；
The test bracket includes pendant bar, fixed link, left plate and right plate；The pendant bar and fixed link are isometric
Spend metallic rod, and it is parallel be fixed between left plate and right plate, the quantity of pendant bar is two, and two pendant bars are fixed on a left side
The top of side plate and right plate and in same level height, fixed link is fixed on left plate and right plate lower part；The fixation
The effect of bar mainly forms triangle with two pendant bars and fixes, it is ensured that test bracket will not deform；
The left plate is equipped with magnetic suction disc fixing groove, and the right plate is equipped with non-contact displacement transducer fixing groove,
The magnetic suction disc fixing groove of left plate can form the cooperation that can freely load and unload with magnetic suction disc, and the contactless displacement of right plate passes
Sensor fixing groove can form the cooperation that can freely load and unload with non-contact displacement transducer；
The bellows encapsulation end coordinates with bellow mold, and left side bellows encapsulation end is fixing end potted ends
Head, right side bellows encapsulation end encapsulate end for test lead, and fixing end encapsulation end forms detachable with magnetic suction disc
Magnetic connection, fixing end encapsulation end be equipped with venthole, venthole be located at fixing end encapsulate 12 o-clock position of end disc,
When bellows encapsulation end coordinates with bellow mold, connected inside the venthole and bellow mold；
The buffering pressure air-pocket encapsulates the venthole set on end by fixing end and is connected with bellow mold；
The chain sling includes hook and wire chain, is hung on the pendant bar.
The magnetic suction disc fixing groove is located at the middle part of left plate, and in up-down structure, a length of 40~60mm is described non-contact
Formula displacement sensor fixing groove is located at the middle part of right plate, in up-down structure, a length of 40~60mm.
The trough type design of the up-down structure of the magnetic suction disc fixing groove and non-contact displacement transducer fixing groove, can
So that non-contact displacement transducer and magnetic suction disc can freely up and down adjust height, to adapt to the wave of different diameter specifications
Line pipe mold.Since the bellow mold size specification of cement paste, mortar and concrete is variant, when being tested, wave
The both ends center point height of line pipe mold can change, and therefore, it is necessary to adjust magnetic suction disc and non-contact displacement transducer
Height, so as to still be able in the case where using different size bellow mold test cement-based material axial deformation.
For containing cement-based material, the bellows encapsulation end has 2~4 ° of taper, uses the bellow mold
In encapsulation bellow mold；The bellow mold for containing cement-based material need to be sling with the chain sling of 5~30 same sizes.
It, can be before bellows encapsulates end in order to ensure bellows encapsulation end can be fitted close with bellow mold
Setting external screw thread in end releases bellows encapsulation end when being not cement-based material expansion, and bellows encapsulates the taper of end
Design realizes the convenience of operation primarily to it can be easily filled in bellow mold.
The chain sling includes hook and wire chain, and the material of hook is steel or glass, and wire chain both ends connect respectively
One hook, hangs on pendant bar, and the chain sling of pendant bar and 5~30 same sizes coordinates, and bellow mold is by chain sling
It slings, when the bellow mold for having contained cement-based material is lifted, chain sling is indeformable, i.e., the intensity of described chain sling can be
Deformation is not generated when slinging the bellow mold for having contained cement-based material.
When the bellow mold for having contained cement-based material sample is placed on chain sling, magnetic suction disc is by fixing end potted ends
Head is sucked, and when cement-based material is deformed, wire chain will not generate restraining force to bellow mold, be equivalent to bellows
Mold has been placed on an absolutely smooth table top, is eliminated so as to 100% and is tested caused by stent frictional force
Error.
Other than stent frictional force, cement-based material early deformation can change to the gentle pressure of bellow mold internal volume
Change, especially the relatively low cement-based material of water-cement ratio is larger to the deflection during final set in initial set, in closed ripple pipe die
In tool, when internal volume changes, internal pressure can also change, and filled inside bellow mold and newly mix cement base
After cementitious material, fresh paste is a kind of solid-liquid mixture, and property is the fluid of similar water, and water is recognized at a certain temperature
For be it is incompressible, therefore, when bellow mold generate volume change when, inside will generate larger pressure change,
So as to constrain the deformation of bellow mold, influence of this restraining force to test result will be with the heat evolution velocity of cement-based material
And be gradually reduced, when after cement-based material final set 24 it is small when, elasticity modulus is sufficiently large, and this internal pressure is to ripple pipe die
The influence of tool can be ignored substantially.In previous test, also there are multiple ripple pipe dies for having contained cement-based material
The leakproofness of tool is inconsistent and the otherness of bellow mold rigidity itself causes error to test result or even causes morning
Phase test result is very different, complete irregularities, therefore, in previous test, the deformation data data fluctuations of early age compared with
Greatly and it is difficult with repeatability.In order to solve this problem, the present invention is provided with venthole in fixing end encapsulation end, makes ventilation
Hole is directly connected with buffering pressure air-pocket, it is ensured that and during the test, the pressure inside bellow mold is equal to external atmosphere pressure always,
Cause data test inaccuracy and repeatability bad so as to solve the problems, such as the variation of bellow mold internal pressure.
The buffering pressure air-pocket is that have 50~100cm in a free state3The soft silica gel air bag of inner space, can produce
Raw 0~3000cm3Deformation, one end of buffering pressure air-pocket and plastic tube connects, and the other end of plastic tube is through rubber stopper, rubber
The venthole that rubber plug can encapsulate end with fixing end forms tight fit, buffering pressure air-pocket, plastic tube, venthole and ripple pipe die
Tool forms the internal structure connected.
Designing scheme according to the present invention, is 0.1~4mm according to the deflection of different type cement-based material, and difference is advised
The volume change of the bellow mold of lattice ranging from 0.05~20cm3, bellow mold volume change generate pressure change by
The inner space balance of buffering pressure air-pocket, since buffering pressure air-pocket is soft silica gel air bag, under stress can Free Transform, then lead to
It crosses deformation and carries out pressure balance with atmospheric pressure, finally make in bellow mold and atmospheric pressure is formed and balanced, so as to eliminate bellows
The influence of mould inside pressure.
For the convenience that test bracket is moved, a handle is equipped in the left plate of test bracket and right plate upper end
Hand.
Using a kind of test method of the early age self-constriction of cement-based material of test device of the present invention, including as follows
Step：
(1) magnetic suction disc and non-contact displacement transducer be first installed on test bracket, by 5~30 same sizes
The pendant bar of chain sling and test bracket coordinates, and is uniformly distributed according to the ripple spacing of bellow mold, it is ensured that test bracket
Placement position is secured, will not rock and shake；
(2) test lead encapsulation end is coordinated with bellow mold, the opening up standing of bellow mold, by cement matrix
Slurry body is fitted into bellow mold, and during charging, bellow mold is elongated 20~40mm, when cement-based material tries
When sample is fed to bellow mold residue 30~50mm height, fixing end encapsulation end with bellow mold is coordinated, slowly will
The bellow mold being elongated is returned to former length, and in the process, the air in bellow mold is discharged by the venthole,
Buffering pressure air-pocket by plastic tube and rubber stopper with the venthole is formed and coordinated by 10~20mm of its interior air residue, slow to calm the anger
It is connected inside capsule and bellow mold, bellow mold is horizontal positioned, and venthole is located at 12 o'clock direction position, gently shakes
It is dynamic, residual gas in bellow mold is made to be moved to bellow mold top, the ripple of bellow mold is made to pass through the sky on top
Gas connects；
(3) bellow mold for having contained cement-based material sample is placed on chain sling, and ensures that venthole is located at 12 points
Clock direction position, adjusts magnetic suction disc up and down, links the magnetic force that is centrally formed that magnetic suction disc encapsulates end with fixing end, fixed
Magnetic suction disc, then adjustment non-contact displacement transducer up and down make it just be directed at the center of test lead encapsulation end, and
Fixed non-contact displacement transducer starts the deformation test of cement-based material；
(4) during the test, the buffering pressure air-pocket will shrink with bellow mold or extend and generate different degrees of
Volume change, so as to which bellow mold air pressure inside be made to be consistently equal to test environment air pressure；
(5) test result calculations：Assuming that the microstrain value of cement-based material time is A, the wave of cement-based material has been contained
The initial length of line pipe mold is L, and test initial reading is A0, test reading A1, then A=(A1-A0)/L·10-6。
When carrying out the test of cement-based material Early self-shrinkage, using microstrain characterization test as a result, test reading is non-
For tangent displacement sensor to the distance of test lead encapsulation end, the test initial reading is as cement-based material deformation zero
The test reading of point, the test initial reading are set according to the judgement of technical staff, and any test data can be set as testing
Initial reading.
The test device and test method of the present invention is in the nature the deformation for accurately and reliably testing cement-based material, if
Cement-based material is replaced with other materials with early deformation can also realize the test of its deformation, therefore, skill of the invention
Art method is also suitable for the self-constriction deformation test of other cementitious materials.
Beneficial effects of the present invention are：
(1) present invention is sling using chain sling by test specimen is tested, and completely eliminates the friction of bellow mold and test bracket,
Cause the test of cement-based material Early self-shrinkage inaccurate so as to solve the friction due to bellow mold and test bracket
The problem of；
(2) present invention is successfully solved using the design of buffering pressure air-pocket and encapsulation end venthole due to ripple pipe die
The problem of tool length variation causes internal pressure to change and had an impact to early deformation, make bellow mold air pressure inside always
Equal to external atmosphere pressure, realize that cement-based material deforms since pouring molding in after final set 24 hours it is accurate, reliable,
The test stablized and repeated.
Description of the drawings
A kind of early age self-constriction test device schematic diagram of cement-based materials of Fig. 1.
A kind of early age self-constriction test device vertical view of cement-based materials of Fig. 2.
One of Fig. 3 test bracket schematic diagrames.
The two of Fig. 4 test bracket schematic diagrames.
Fig. 5 test brackets, magnetic suction disc, chain sling and non-contact displacement transducer assembling schematic diagram.
The assembling schematic diagram of Fig. 6 fixing ends encapsulation end, test lead encapsulation end and bellow mold.
Fig. 7 chain sling schematic diagrames.
Fig. 8 buffering pressure air-pockets encapsulate end assembling schematic diagram with fixing end.
Fig. 9 buffering pressure air-pockets and plastic tube, the integrated combination schematic diagram of rubber stopper.
One of Figure 10 fixing ends encapsulation end schematic diagram.
The two of Figure 11 fixing ends encapsulation end schematic diagram.
Figure 12 test leads encapsulate end schematic diagram.
A kind of design sketch of the early age self-constriction test device of cement-based materials of Figure 13.
Fig. 1~13 are respectively labeled as：1 bellow mold, 2 magnetic suction discs, 3 non-contact displacement transducers, 4 test branch
Frame, 41 pendant bars, 42 fixed links, 43 left plates, 431 magnetic suction disc fixing grooves, 44 right plates, 441 contactless displacements sensing
Device fixing groove, 45 handles, 5 buffering pressure air-pockets, 51 plastic tubes, 52 rubber stoppers, 6 fixing ends encapsulation end, 61 ventholes, 62 outer spiral shells
Line, 7 chain slings, 71 hooks, 72 wire chains, 8 test leads encapsulation end.
Specific embodiment
A kind of test device of the early age self-constriction of cement-based material, senses including magnetic suction disc 2 and contactless displacement
Device 3, bellow mold 1, test bracket 4, bellows encapsulation end (6,8), chain sling 7 and buffering pressure air-pocket 5, plastic tube and rubber
Plug；
The bellow mold 1 stretch in a free state 3mm and compress 3mm used in power no more than 20mN；
The test bracket 4 includes pendant bar 41, fixed link 42, left plate 43 and right plate 44, pendant bar 41 and fixation
Bar 42 for equal length metallic rod and it is parallel be fixed between left plate 43 and right plate 44, the quantity of pendant bar 41 is two, two
A pendant bar 41 is fixed on the top of left plate 43 and right plate 44 and in same level height, and fixed link 42 is fixed on left side
44 lower part of plate 43 and right plate；
The left plate 43 is equipped with magnetic suction disc fixing groove 431, and right plate 44 is fixed equipped with non-contact displacement transducer
Slot 441, the magnetic suction disc fixing groove 431 of left plate 43 and magnetic suction disc 2 form the cooperation that can freely load and unload, right plate 44 it is non-
Tangent displacement sensor fixing groove 441 forms the cooperation that can freely load and unload with non-contact displacement transducer 3；
The magnetic suction disc fixing groove 431 is located at the middle part of left plate 43, and in up-down structure, the contactless displacement passes
Sensor fixing groove 441 is located at the middle part of right plate 44, in up-down structure；
Bellows encapsulation end (6,8) is with 4 ° of tapers, bellows encapsulation end (6,8) and bellow mold 1
Cooperation, left side bellows encapsulation end encapsulate end 6 for fixing end, and bellows encapsulation end in right side encapsulates end 8 for test lead,
The fixing end encapsulation end 6 forms the magnetic connection of detachable with magnetic suction disc 2, and the fixing end encapsulation end 6 is set
There is venthole 61, venthole 61 is located at fixing end encapsulation 6 disc of end, 12 o-clock position, when bellows encapsulates end (6,8)
When coordinating with bellow mold 1, the venthole 61 is connected with 1 inside of bellow mold；
The chain sling 7 includes hook 71 and wire chain 72, and the material for linking up with 71 is steel or glass, 72 both ends of wire chain
One hook 71 of connection, hook 71 are hung on pendant bar 41 respectively, and hook 71 freely coordinates with what the formation of pendant bar 41 can pick and place,
The chain sling 7 of 12 same sizes coordinates with pendant bar 41, and bellow mold 1 is sling by chain sling 7；
The buffering pressure air-pocket 5 is has 80cm in a free state3The soft silica gel air bag of inner space, buffering pressure air-pocket 5
It is connect by plastic tube 51 with rubber stopper 52, plastic tube 51 encapsulates 6 shape of end through rubber stopper 52, rubber stopper 52 with fixing end
Into the cooperation of detachable, buffering pressure air-pocket 5 is made to be connected with 1 inside of bellow mold.
It, can be in bellows potted ends in order to ensure bellows encapsulation end (6,8) can be fitted close with bellow mold 1
The front end setting external screw thread 62 of head.
For the convenience that test bracket 4 is moved, one is equipped in the left plate 43 of test bracket 4 and 44 upper end of right plate
A handle 45.
A kind of test method of the early age self-constriction of cement-based material, includes the following steps：
(1) magnetic suction disc 2 and non-contact displacement transducer 3 are first installed on test bracket 4, by 12 chain slings 7 with surveying
The pendant bar 41 of examination stent 4 coordinates, and be uniformly distributed according to the ripple spacing of bellow mold 1, and test bracket 4 is placed in perseverance
In warm test environment, and ensure that the placement position of test bracket 4 is secured, will not rock and shake；
(2) test lead encapsulation end 8 is coordinated with bellow mold 1,1 opening up standing of bellow mold, by cement
Base material slurry body is fitted into bellow mold 1, during charging, bellow mold 1 is elongated 30mm, works as cement-based material
When sample is fed to 1 residue 40mm height of bellow mold, fixing end encapsulation end 6 with bellow mold 1 is coordinated, slowly will
The bellow mold 1 being elongated is returned to former length, and in the process, the air in bellow mold 1 passes through the venthole 61
Discharge, interior air residue 10mm block venthole 61 with rubber stopper 52, connect inside buffering pressure air-pocket 5 and bellow mold 1
It is logical, bellow mold 1 is horizontal positioned, and venthole 61 is located at 12 o'clock direction position, gently shakes, makes bellow mold 1
Interior residual gas is moved to 1 top of bellow mold, makes the ripple of bellow mold 1 all by the air communication on top；
(3) bellow mold 1 for having contained cement-based material sample is placed on chain sling 7, and ensures that venthole 61 is located at
12 o'clock direction position adjusts magnetic suction disc 2 up and down, makes what magnetic suction disc 2 and fixing end encapsulated end 6 to be centrally formed magnetic force chain
It connects, fixed magnetic suction disc 2, then adjustment non-contact displacement transducer 3 up and down, it is made just to be directed at test lead encapsulation end 8
Center, and fixed non-contact displacement transducer 3 start the deformation test of cement-based material；
(4) during the test, the buffering pressure air-pocket 5 will shrink or extend with bellow mold 1 and generate different journeys
The volume change of degree, so as to which 1 air pressure inside of bellow mold be made to be consistently equal to test environment air pressure；
(5) test result calculations：Assuming that the microstrain value of cement-based material time is A, the wave of cement-based material has been contained
The initial length of line pipe mold 1 is L, and test initial reading is A0, test reading A1, then A=(A1-A0)/L·10-6。
When carrying out the test of cement-based material Early self-shrinkage, using microstrain characterization test as a result, test reading is non-
For tangent displacement sensor 3 to the distance of test lead encapsulation end 6, the test initial reading is to be deformed as cement-based material
The test reading of zero, the test initial reading are set according to the judgement of technical staff, and any test data can be set as surveying
Try initial reading.
Embodiment
It it is 20 ± 1 DEG C in temperature, mix cement slurry in the laboratory that relative humidity is 60%, mix ratio is cement
500g, flyash 250g, miberal powder 170g, silicon ash 80g, water 200g, high performance water reducing agent of polyocarboxy acid 10g.It is such as specific using two sets
The test device of the early age self-constriction of cement-based material described in embodiment, using two internal diameters be 20mm, outer diameter is
Bellow mold compression 3mm is respectively firmly 10.1mN, 10.2mN, incited somebody to action by 29mm, the bellow mold that length is 400mm
It is respectively firmly 12.1mN, 12.0mN that bellow mold, which stretches 3mm,.
Using the technical method described in the specific embodiment of the invention, two cement slurry test specimens of test are opened from pouring molding
Begin to the self-constriction of 24 hours after final set.
Test result shows that the test result of two cement slurry test specimens is basically identical, and test result converged into curve, two
Curve essentially coincides, and the maximum deviation of two groups of data is no more than 1%.
Claims (8)
1. a kind of test device of the early age self-constriction of cement-based material, it is characterised in that：Including magnetic suction disc (2), non-contact
Formula displacement sensor (3), bellow mold (1), test bracket (4), bellows encapsulation end, chain sling (7), buffering pressure air-pocket (5),
Plastic tube (51) and rubber stopper (52)；
The test bracket (4) includes pendant bar (41), fixed link (42), left plate (43) and right plate (44)；The pendant
Bar (41) and fixed link (42) are equal length metallic rod, and it is parallel be fixed between left plate (43) and right plate (44), pendant
The quantity of bar is two, and two pendant bars are fixed on the top of left plate (43) and right plate (44) and in same level height
Degree, fixed link (42) are fixed on left plate (43) and right plate (44) lower part；
The left plate (43) senses equipped with magnetic suction disc fixing groove (431), the right plate (44) equipped with contactless displacement
Device fixing groove (441), the magnetic suction disc fixing groove (431) of left plate (43) can form what can freely be loaded and unloaded with magnetic suction disc (2)
Cooperation, the non-contact displacement transducer fixing groove (441) of right plate (44) can be formed with non-contact displacement transducer (3) can
The cooperation freely loaded and unloaded；
The bellow mold (1) stretch in a free state 3mm and compress 3mm used in power no more than 20mN；
The bellows encapsulation end coordinates with bellow mold (1), and bellows encapsulation end in left side encapsulates end for fixing end
(6), bellows encapsulation end in right side encapsulates end (8) for test lead, fixing end encapsulation end (6) and magnetic suction disc (2) formation
The magnetic connection of detachable, fixing end encapsulate end (6) equipped with venthole (61), and venthole (61) is encapsulated positioned at fixing end
12 o-clock position of end (6) disc, when bellows encapsulation end coordinates with bellow mold, the venthole (61) and wave
It is connected inside line pipe mold (1)；
The buffering pressure air-pocket (5) connect with one end of plastic tube (51), and the other end of plastic tube (51) is through rubber stopper
(52), rubber stopper (52) can encapsulate venthole (61) the formation tight fit of end (6), the buffering pressure air-pocket with fixing end
(5), plastic tube (51), venthole (61) form the internal structure connected with bellow mold (1)；
The chain sling (7) includes hook (71) and wire chain (72), is hung on the pendant bar (41).
2. the test device of the early age self-constriction of a kind of cement-based material according to claim 1, which is characterized in that described
Magnetic suction disc fixing groove (431) is positioned at the middle part of left plate (43), in up-down structure, a length of 40~60mm；It is described contactless
Displacement sensor fixing groove (441) is positioned at the middle part of right plate (44), in up-down structure, a length of 40~60mm.
3. the test device of the early age self-constriction of a kind of cement-based material according to claim 2, which is characterized in that described
Bellow mold (1) is for containing cement-based material, and the bellows encapsulation end has 2~4 ° of taper, for encapsulating wave
Line pipe mold；The bellow mold for containing cement-based material need to be sling with the chain sling (7) of 5~30 same sizes.
4. the test device of the early age self-constriction of a kind of cement-based material according to claim 3, which is characterized in that described
The front end of bellows encapsulation end is equipped with external screw thread (62).
5. the test device of the early age self-constriction of a kind of cement-based material according to claim 4, which is characterized in that described
The material for linking up with (71) is steel or glass, and wire chain (72) both ends connect a hook (71) respectively, and hook (71) is hung over
On part bar (41).
6. the test device of the early age self-constriction of a kind of cement-based material according to claim 5, which is characterized in that described
Buffering pressure air-pocket (5) is that have 50~100cm in a free state3The soft silica gel air bag of inner space, it can generate 0~
3000cm3Deformation.
7. the test device of the early age self-constriction of a kind of cement-based material according to claim 6, which is characterized in that described
The left plate (42) of test bracket (4) and right plate (44) upper end are equipped with a handle (45).
8. a kind of test method of the early age self-constriction of cement-based material of claim 1 to 7 any one of them, feature exist
In including the following steps：
(1) magnetic suction disc (2) and non-contact displacement transducer (3) are first installed on test bracket (4), it is identical by 5~30
The chain sling (7) of specification coordinates with the pendant bar (41) of test bracket (4), and uniform according to the ripple spacing of bellow mold (1)
Distribution, it is ensured that the placement position of test bracket (4) is secured, will not rock and shake；
(2) test lead encapsulation end (8) and bellow mold (1) are coordinated, the opening up standing of bellow mold, by cement base
Material slurry is fitted into bellow mold, during charging, bellow mold is elongated 20~40mm, works as cement-based material
When sample is fed to bellow mold residue 30~50mm height, fixing end encapsulation end (7) is matched with bellow mold (1)
It closes, the bellow mold being elongated slowly is returned to former length, in the process, the air in bellow mold passes through described logical
Stomata (61) is discharged, and buffering pressure air-pocket (5) is passed through plastic tube (51) and rubber stopper (51) and institute by 10~20mm of interior air residue
It states venthole (61) and forms cooperation, connected inside buffering pressure air-pocket (5) and bellow mold (1), bellow mold is horizontal positioned,
And venthole is located at 12 o'clock direction position, gently shakes, residual gas in bellow mold is made to be moved on bellow mold
Portion makes the ripple of bellow mold pass through the air communication on top；
(3) bellow mold (1) for having contained cement-based material sample is placed on chain sling (7), and ensures venthole (61) position
In 12 o'clock direction position, magnetic suction disc (2) is adjusted up and down, and magnetic suction disc (2) is made to encapsulate the middle heart of end (6) with fixing end
It is linked into magnetic force, fixed magnetic suction disc (2), then adjustment non-contact displacement transducer (3) up and down, it is made just to be directed at test lead
The center of end (8), and fixed non-contact displacement transducer (3) are encapsulated, starts the deformation test of cement-based material；
(4) during the test, the buffering pressure air-pocket (5) will shrink with bellow mold (1) or extend and generate different journeys
The volume change of degree, so as to which bellow mold (1) air pressure inside be made to be consistently equal to test environment air pressure；
(5) test result calculations：Assuming that the microstrain value of cement-based material time is A, the bellows of cement-based material has been contained
The initial length of mold is L, and test initial reading is A0, test reading A1, then A=(A1-A0)/L·10-6。
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