CN206974778U - Prefabricated test specimen and prefabrication system for pre-cast concrete base test specimen crack - Google Patents
Prefabricated test specimen and prefabrication system for pre-cast concrete base test specimen crack Download PDFInfo
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- CN206974778U CN206974778U CN201720955679.9U CN201720955679U CN206974778U CN 206974778 U CN206974778 U CN 206974778U CN 201720955679 U CN201720955679 U CN 201720955679U CN 206974778 U CN206974778 U CN 206974778U
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Abstract
The utility model discloses the prefabricated test specimen and prefabrication system for pre-cast concrete base test specimen crack, the prefabricated test specimen is columned cement base test specimen, and it includes configuration net and the cement basic layer positioned at configuration net both sides；The configuration net is the trellis configuration net that mesh shape is rectangle, and it includes encrypted area and the reserved weak area in encrypted area, and the netting twine in the reserved weak area is removed and forms fracture；And the side of the prefabricated test specimen is located at the both sides of fracture and place is provided with mark.Prefabricated test specimen in prefabrication system provided by the utility model is in the loading effect for the testing machine that is under pressure, the control of the Size of Crack formed to prefabricated test specimen and position can be not only realized by configuration net, also there is the advantages of making crack caused by the crack to be formed close to the true stress cracking of concrete.
Description
Technical field
Cement-based material self-repair technology field is the utility model is related to, it is more particularly to a kind of to be used for pre-cast concrete base test specimen
The prefabricated test specimen and prefabrication system in crack.
Background technology
Cement-based material is that most wide material, particularly concrete material are used in modern architecture material.Finding improves water
The method of the durability of cement-based material, meant a great for the military service performance for improving building, this is also current civil engineering material
Study hotspot.In a manner of improving building structure overall performance to assign cement-based material self-healing properties, as a kind of state
The development trend of border concrete material and construction applications has obtained extensive approval, and this also complies with the strategic development direction of China.
In cement-based material selfreparing research, when particularly studying small-sized cement base test specimen, generally require pair
Its artificial prefabricated crack.Traditional crack production method mainly directly implements bend test by pressure testing machine or pressure is tried
Test to make crack, but be directly difficult to control position, width and quantity caused by crackle using this two classes method, especially for
Subsized specimen is even more easy direct compression damage.The size and position that concrete sample crack occurs are one insoluble
Problem.
In order to solve the above problems, the method induction crackle of prefabricated notch can be used to produce at present, but such method is only
The original position of test specimen cracking and the general area of Crack Extension can be controlled.Cement-based material is a kind of fragile material, once its
Cracking, crack will rapidly carry out and then form through crack so that Size of Crack caused by this kind of method still can not with position
Meet needs well.In addition, the method so as to manufacture of intraocular crack is extracted again also by pre-buried steel disc in the prior art, no
The pattern for crossing crack and actual loading crack that this method is formed differs greatly.
Therefore, prior art could be improved and improve.
Utility model content
In view of in place of above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide for pre-cast concrete base test specimen
The prefabricated test specimen and prefabrication system in crack, the control of the Size of Crack formed to prefabricated test specimen and position can be not only realized, is also had
There is the advantages of crack caused by the crack close to the true stress cracking of concrete formed it into.
Technical scheme is as follows used by the utility model solves technical problem：
A kind of prefabricated test specimen for pre-cast concrete base test specimen crack, the prefabricated test specimen try for columned cement base
Part, it includes configuration net and the cement basic layer positioned at configuration net both sides；
The configuration net is the trellis configuration net that mesh shape is rectangle, and it includes encrypted area and pre- in encrypted area
Stay weak area, the netting twine in the reserved weak area is removed and forms fracture；
The both sides that the side of the prefabricated test specimen is located at fracture are provided with mark towards place.
In the described prefabricated test specimen for pre-cast concrete base test specimen crack, the configuration net is steel wire or web.
A kind of prefabrication system for pre-cast concrete base test specimen crack, including pressure testing machine and laser displacement sensor,
And above-mentioned prefabricated test specimen, the prefabricated test specimen are arranged between the load plate up and down of pressure testing machine, the pressure test
The load(ing) point of machine is corresponding with the mark of the prefabricated test specimen.
In the described prefabrication system for pre-cast concrete base test specimen crack, the mark and pressure test of the prefabricated test specimen
Pad is provided between the load(ing) point of machine；
The pad one side is the plane being adapted to the load plate of pressure testing machine；
The pad another side is the interior concaved circular cambered surface being adapted to the side of prefabricated test specimen.
In the described prefabrication system for pre-cast concrete base test specimen crack, the laser sensor and pressure testing machine are equal
Computer is connected, the laser sensor is located at the side of pressure testing machine, and the camera of laser sensor is in alignment with prefabricated examination
The middle part of part.
Compared to prior art, prefabricated test specimen provided by the utility model for pre-cast concrete base test specimen crack and prefabricated
In system, the prefabricated test specimen is columned cement base test specimen, and it includes configuration net and the cement base positioned at configuration net both sides
Layer；The configuration net is the trellis configuration net that mesh shape is rectangle, and it includes encrypted area and reserved thin in encrypted area
Weak area, the netting twine in the reserved weak area are removed and form fracture；And the side of the prefabricated test specimen is located at the two of fracture
Side is provided with mark towards place.Prefabricated test specimen in prefabrication system provided by the utility model is in the loading of testing machine that is under pressure
During effect, the control of the Size of Crack formed to prefabricated test specimen and position can be not only realized by configuration net, also having makes to be formed
Crack close to concrete true stress cracking caused by crack the advantages of.
Brief description of the drawings
Fig. 1 is the side view of the prefabricated test specimen provided by the utility model for pre-cast concrete base test specimen crack.
Fig. 2 is the vertical view of the configuration net of the prefabricated test specimen provided by the utility model for pre-cast concrete base test specimen crack
Figure.
Fig. 3 is the structural representation of the prefabrication system provided by the utility model for pre-cast concrete base test specimen crack.
Fig. 4 is the front view of the prefabrication system provided by the utility model for pre-cast concrete base test specimen crack.
Fig. 5 is the side view of the prefabrication system provided by the utility model for pre-cast concrete base test specimen crack.
Wherein：10th, cement basic layer；20th, configuration net；21st, encrypted area；22nd, weak area；30th, mark line；31st, Upper gasket；
32nd, lower gasket；41st, upper load plate；42nd, lower load plate；50th, laser displacement sensor；100th, prefabricated test specimen.
Embodiment
To make the purpose of this utility model, technical scheme and effect clearer, clear and definite, develop simultaneously implementation referring to the drawings
The utility model is further described example.It should be appreciated that specific embodiment described herein is only explaining this practicality
It is new, it is not used to limit the utility model.
Referring to Fig. 1, it is the side view of the prefabricated test specimen provided by the utility model for pre-cast concrete base test specimen crack
Figure, the prefabricated test specimen 100 are columned cement base test specimen, including configuration net 20 and the cement base positioned at the both sides of configuration net 20
Layer 10.Also referring to Fig. 2, the configuration net 20 is the trellis configuration net that mesh shape is rectangle, and it includes the He of encrypted area 21
Reserved weak area 22 in encrypted area 21, the netting twine in the reserved weak area 22 is removed and forms fracture, described pre-
The both sides that the side of test specimen processed is located at fracture are provided with mark towards place, and the mark is specially the plane perpendicular with cement base test specimen
A mark line 30.
Referring to Fig. 3, it is the structure of the prefabrication system provided by the utility model for pre-cast concrete base test specimen crack
Schematic diagram, the prefabrication system include pressure testing machine（Not shown in figure）, laser displacement sensor 50, it is and above-mentioned prefabricated
Test specimen 100, the prefabricated test specimen 100 are arranged between the upper load plate 41 of pressure testing machine and lower load plate 42, the pressure
The load(ing) point of testing machine is corresponding with the mark of the prefabricated test specimen 100.
Wherein, the configuration net 20 is steel wire or web.When prefabricated test specimen 100 be under pressure testing machine loading make
Used time, configuration net 20 will provide the bearing capacity of resistance loading force for prefabricated test specimen 100.But with the progress of loading procedure, structure
Reserved weak area 22 in type net 20 can due to bearing capacity is smaller and first losing bearing capacity makes prefabricated test specimen 100 form fine fisssure
Seam.And with the increase of external load power, crack will continue extension so as to form macrocrack herein, you can according to reserved weakness
Realize the position caused by induced fractures in loading in the position in area 22.In addition, the use of the encrypted area 21 of configuration net 20 adds
The toughness of sample itself, so as to delay the extension in crack, be advantageous to the control of fracture width in loading procedure.So as to logical
Cross configuration net 20 and realize the control of the Size of Crack formed to prefabricated test specimen 100 and position, and crack and the coagulation to be formed can be made
Crack caused by native true stress cracking has identical crack tip micro-crack area, crackle tortuosity and crack wall coarse
Degree.
Further, referring to Fig. 4, being set between the mark point of the prefabricated test specimen 100 and the load(ing) point of pressure testing machine
It is equipped with pad, and respectively Upper gasket 31 and lower gasket 32；The pad one side is what is be adapted to the load plate of pressure testing machine
Plane；The pad another side is the interior concaved circular cambered surface being adapted to the side of prefabricated test specimen 100., can be with by the use of pad
The movement of sample when limiting prefabricated sample installation and loading, and prefabricated test specimen 100 and upper load plate 41 during loading can be reduced
The stress concentration of contact surface between lower load plate 42, prevent that local failure occurs at contact surface, influence the formation in crack.
Further, referring to Fig. 5, the laser displacement sensor 50 is all connected with computer with pressure testing machine, institute
The side that laser displacement sensor 50 is located at pressure testing machine is stated, the camera of laser displacement sensor 50 is in alignment with prefabricated test specimen
100 middle part.Before being loaded, the camera by laser displacement sensor 50 is needed first in alignment with prefabricated test specimen 100
Portion completes calibration, prevents the measurement of fracture width from error occur.Secondly, in loading procedure, by computer according to pressure
The displacement control mode control of testing machine ensures the germinating and expansion in the crack of prefabricated sample to the loading velocity of prefabricated test specimen 100
Speed is opened up very slowly to avoid prefabricated sample brittle break, influences the formation in crack.
In addition, in traditional crack prefabrication system, its control of crack width generally use LVDT displacement sensor mixes
Native lateral displacement is coagulated to characterize crack width, and the method needs first fix sensor and concrete sample, after completion sample preparation again
Removal sensor.But the process in removal sensor can produce Secondary Disturbance so as to influence for having produced the sample in crack
Make precision.And the laser displacement sensor 50 that the system uses is arranged at the side of prefabricated test specimen 100, in measurement process not with
Prefabricated test specimen 100 contacts, and effectively prevent Secondary Disturbance.
The utility model also provides a kind of method for pre-cast concrete base test specimen crack, comprises the following steps：
S100, make configuration net：The configuration net is the trellis configuration net that mesh shape is rectangle, removes trellis configuration net
Presumptive area grid, the netting twine of the presumptive area is formed weak area of the fracture as configuration net；
S200, make cement base test specimen：After pouring first layer cement basic layer in a mold, configuration net is placed above it,
And the both sides direction of fracture is recorded on mould, then pour second layer cement basic layer and cover the configuration net, maintenance to formation cylinder
After the cement base test specimen of shape, remove mould and the relevant position of the side of cement base test specimen is recorded according to it be marked；
S300, the prefabricated installation in crack：After cement base test specimen to specified age is conserved, the cement base test specimen is positioned over
Between the load plate up and down of pressure testing machine, and load(ing) point is selected according to the mark；
S400, crack make：Start pressure testing machine, vertical load is applied to cement base test specimen, passed by laser displacement
Sensor gathers the width data in crack caused by test specimen in real time, and when the width in crack reaches target width, pressure testing machine stops
Loading.
Further, also include after the step S200：
Continue repeated several times and pour step, i.e., continue to put on the cement basic layer of the top of the cement base test specimen of formation
Put the size and direction one of new configuration net, the size of the fracture of new configuration net and the fracture towards the configuration net with having placed
Cause, and pour new cement basic layer on the net in new configuration.The present embodiment is preferably to repeat to pour step once, compared to only
The cement base test specimen of monolayer configurations web frame, the cement base test specimen for possessing double layer configuration web frame can be with tightened up control critical eigenvalue
Position is produced, and makes crack caused by the crack to be formed closer to the true stress cracking of concrete.
Further, the step S300 is specifically included：
S301, maintenance test specimen to specified age after, by cement base test specimen be erected in pressure testing machine load plate up and down it
Between；
S302, the load(ing) point according to the mark position of cement base test specimen side selection pressure testing machine, and at load(ing) point
The contact surface of setting pad, pad and cement base test specimen is the interior concaved circular cambered surface coordinated with the side of cement base test specimen.
In addition, also include before the step S400：
Laser displacement sensor is set in the side of pressure testing machine, and by laser displacement sensor and pressure testing machine with
Computer connects；
The middle part of the camera alignment test specimen of laser displacement sensor, completes calibration.
The step S400 is specifically included；
S401, start pressure testing machine, using displacement control mode to test specimen vertical load, and control its loading velocity low
In predetermined value, to avoid the generation in crack and expansion rate is too fast causes sample to be destroyed；
S402, the target width for setting crack on computers, test specimen generation is gathered by laser displacement sensor in real time
Crack width data and be sent to computer, when computer analysis crack width reach target width when stop loading.
In order to be better understood from the utility model, it is used for prefabricated water to provided by the utility model below in conjunction with Fig. 1~Fig. 5
The crack prefabrication step of the system in mud base test specimen crack is described in detail：
Steel wire is prepared first, i.e., by the size of cement base test specimen（Φ 100mm × 50mm mortar specimen）Cut two
Steel wire（Using the commercially available stainless steel galvanized steel wire netting of 1.5mm diameters 304, size of mesh opening is 15mm × 15mm square net
Lattice）, and the vertical steel wire in the centre of two steel wires is cut into 50mm.
Then placement layer by layer forms cement base test specimen, i.e., pours in a mold after completing first layer cement basic layer（Pour
25mm is high）, a steel wire after cutting is placed in the top of first layer cement basic layer 10, and according to steel wire fracture both sides direction
Mark is made on mould.
Continue joints cement basic unit 10, and place an other steel wire, make the fracture direction of two steel wires consistent.
After pouring last layer of cement basic layer on second steel wire, the cement base test specimen of formation is placed on standard curing room.Wait to support
Shield during form removal, draws corresponding mark line according to the mark on mould in the side of cement base test specimen, then proceeded to after 24 hours
Maintenance is until test age.
Wait after the completion of conserving, first cement base test specimen is placed on lower gasket, and adjust between cement base test specimen and lower gasket
Bonding position so that mark line overlaps with the center line of lower gasket.It is placed on to load plate under pressure testing machine together afterwards
On, Upper gasket is set, and start pressure testing machine so that load plate contacts with pad generation up and down, controlled loading load is little
In 100N.
Laser displacement gauge is installed in the side of pressure testing machine so that in the camera alignment sample of laser displacement sensor
Portion, and connect computer and complete calibration.
Load is continued to cement base test specimen by pressure testing machine, and 0.1mm/ is controlled according to displacement control mode
Min loading velocity.Stop adding when the width for detecting crack by laser displacement sensor reaches 0.5mm target width
Carry, and unloaded after protecting load 30s, the making that cement base test specimen completes cement base test specimen crack is removed from pressure testing machine.
Therefore, the prefabricated test specimen and prefabrication system provided by the utility model for pre-cast concrete base test specimen crack, is being poured
Build during forming the prefabricated test specimen of cement base, form fracture to produce the configuration net of weak area using by removing netting twine, make
Prefabricated test specimen is obtained in the loading effect for the testing machine that is under pressure, not only can realize what prefabricated test specimen was formed by the configuration net
Size of Crack and the control of position, also having makes the excellent of crack caused by the crack to be formed close to the true stress cracking of concrete
Point.
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
The design of its utility model is subject to equivalent substitution or change, and all these changes or replacement should all belong to appended by the utility model
Scope of the claims.
Claims (5)
1. a kind of prefabricated test specimen for pre-cast concrete base test specimen crack, it is characterised in that the prefabricated test specimen is columned
Cement base test specimen, it includes configuration net and the cement basic layer positioned at configuration net both sides；
The configuration net is the trellis configuration net that mesh shape is rectangle, and it includes encrypted area and reserved thin in encrypted area
Weak area, the netting twine in the reserved weak area are removed and form fracture；
The both sides that the side of the prefabricated test specimen is located at fracture are provided with mark towards place.
2. the prefabricated test specimen according to claim 1 for pre-cast concrete base test specimen crack, it is characterised in that the configuration
Net is steel wire or web.
3. a kind of prefabrication system for pre-cast concrete base test specimen crack, including pressure testing machine and laser displacement sensor, its
It is characterised by, in addition to prefabricated test specimen as claimed in claim 1 or 2, the prefabricated test specimen are arranged at the upper of pressure testing machine
Between lower load plate, the load(ing) point of the pressure testing machine is corresponding with the mark of the prefabricated test specimen.
4. the prefabrication system according to claim 3 for pre-cast concrete base test specimen crack, it is characterised in that described prefabricated
Pad is provided between the mark of test specimen and the load(ing) point of pressure testing machine；
The pad one side is the plane being adapted to the load plate of pressure testing machine；
The pad another side is the interior concaved circular cambered surface being adapted to the side of prefabricated test specimen.
5. the prefabrication system according to claim 3 for pre-cast concrete base test specimen crack, it is characterised in that the laser
Sensor is all connected with computer with pressure testing machine, and the laser sensor is located at the side of pressure testing machine, laser sensor
Camera in alignment with prefabricated test specimen middle part.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720955679.9U CN206974778U (en) | 2017-08-02 | 2017-08-02 | Prefabricated test specimen and prefabrication system for pre-cast concrete base test specimen crack |
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| CN201720955679.9U CN206974778U (en) | 2017-08-02 | 2017-08-02 | Prefabricated test specimen and prefabrication system for pre-cast concrete base test specimen crack |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157307A (en) * | 2019-12-30 | 2020-05-15 | 扬州大学 | Method for manufacturing self-repairing cement-based material test piece cracks |
| CN111413179A (en) * | 2020-05-26 | 2020-07-14 | 深圳大学 | Concrete crack control device and control system thereof |
-
2017
- 2017-08-02 CN CN201720955679.9U patent/CN206974778U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111157307A (en) * | 2019-12-30 | 2020-05-15 | 扬州大学 | Method for manufacturing self-repairing cement-based material test piece cracks |
| CN111413179A (en) * | 2020-05-26 | 2020-07-14 | 深圳大学 | Concrete crack control device and control system thereof |
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