CN109822724A - Variable thickness single fiber pull-out cement base test piece mould and adjusting and test method - Google Patents
Variable thickness single fiber pull-out cement base test piece mould and adjusting and test method Download PDFInfo
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Abstract
The present invention proposes variable thickness single fiber pull-out cement base test piece mould and adjusting and test method.Mold includes bottom plate, frame, column, flank module and demarcation plate up and down, and each section is attached by worm screw etc..The method based on the die adjustment specimen thickness is proposed, the single fiber pull-out cement base test specimen of specified thickness can be obtained under the premise of not cutting sample.The present invention can be with the multiple single fiber pull-out cement base test specimens of primary concreting, structure is simple, strong operability, demoulding is relatively easy to, and there is divider plate between each test specimen, it is independent to form, and the thickness for pouring test specimen can be adjusted by adjusting the position of flank module, to eliminate the cutting process in conventional method, the risk that cutting causes fiber/matrix interfacial failure is evaded.
Description
Technical field
The present invention relates to the testing fields of fiber reinforced cement-based material, pull out more particularly to a kind of variable thickness single fiber
Cement base test piece mould and adjusting and test method out.
Background technique
High-tenacity fiber enhances cement-base composite material (Engineered Cementitious Composites, ECC)
It is a kind of new material with the performances such as superelevation ductility, shock resistance, durability, anticracking and strain hardening characteristic, gram
Conventional cement sill is taken there are tensile strength the disadvantages of low, deformability is low, brittleness is big and impact resistance is poor.It is such compound
The mechanical characteristic of material depends primarily on the section adhesive property of its internal fiber and cement matrix, and the parameter master of the performance
It is obtained if being tested by single fiber pull-out.,
It for pouring for the test specimen is poured using determining thickness both at home and abroad before this, is then cut to specified thickness again.But
Fiber is inevitably resulted in cutting process and matrix section is destroyed, and influences experimental result.Mold proposed by the present invention and thickness
Degree adjusting method can directly pour to obtain the single fiber pull-out cement base test specimen of specified thickness under the premise of not damaging test specimen,
To measure accurate interfacial bond property parameter.
Summary of the invention
In order to solve problem above, the present invention provides a kind of variable thickness single fiber pull-out cement base test piece mould and adjusting
And test method, the single fiber pull-out cement base test specimen of specified thickness can be obtained under the premise of not losing test specimen.The present invention
Can be with the multiple single fiber pull-out cement base test specimens of primary concreting, structure is simple, and strong operability, demoulding is relatively easy to, and
There is divider plate between each test specimen, it is independent to form, and examination can be poured to adjust by adjusting the position of flank module
The thickness of part has evaded the wind that cutting causes fiber/matrix interfacial failure to eliminate the cutting process in conventional method
Danger, for this purpose, the present invention provides novel changable thickness single fiber pull-out cement base test piece mould, including it is bottom plate, frame, vertical
Four angles of column, flank lower module, flank upper module and demarcation plate, the bottom plate are connect with frame by four screws, described
Bottom plate and two columns pass through two screw connections respectively, and two flank lower module two sides pass through corresponding column by screw rod and connect
It connects, the flank upper module is connected with corresponding flank lower module by screw on flank lower module, and the fiber is on flank
Between module and flank lower module, the demarcation plate is inserted into the slot of flank lower module and flank upper module.
The further limitation of structure of the invention, the demarcation plate have 3-5.
The further limitation of structure of the invention, the thickness of the frame are equal to the thickness of flank lower module.
The method for thickness regulation of variable thickness single fiber pull-out cement base test piece mould of the present invention, including pour process
With demoulding process:
It is described that pour process step as follows:
1) position of fibers is determined on frame, pastes fiber, column is fixed on bottom plate, put on screw rod；
2) flank lower module is slid into along screw rod, two sides are secured with nuts, and measure distance between the flank lower module of two sides, really
Determine specimen thickness, at this time vertical columns and flank lower module；
3) in the side oiling of the middle position of bottom plate, flank lower module, the side of flank upper module and demarcation plate, water is got out
Mud base slurry；
4) it is inserted into demarcation plate, a unilateral opening slot is formed between two flank lower modules, matrix is poured into slot, due to space
Very little is vibrated with tool；
5) frame for being pasted with fiber is put into from above, connect and is completely fixed with bottom plate, fiber just falls in each examination at this time
Among part casting position, make fiber inlet part matrix outstanding as far as possible；
6) flank upper module 5 is stacked on flank lower module 4, is completely fixed, pour into the slot of matrix originally at this time toward enterprising
It has gone extension, has poured into new matrix, and vibrated in two sides with tool, fiber cannot be touched, slight vibrating mould keeps matrix close
Real, concordant with flank upper module at the top of matrix, top is contacted with air, which pours completion；
The demoulding process step is as follows:
1) demarcation plate 6 is extracted, the adhesive portion of fiber 7 is removed from frame 2；
2) connecting screw for releasing flank upper module 5 and flank lower module 4, removes flank upper module 5；
3) locking of the flank lower module 5 on screw rod is released, it is slowly whole to release flank lower module 4, that is, remove flank lower module
4；
4) acquisition center is inserted with the rectangular coupon of fiber 7.
The further limitation of adjusting method of the present invention, described vibrate with tool is needle.
The test method of variable thickness single fiber pull-out cement base test piece mould of the present invention, the test specimen includes fiber
With the cement block poured, testing procedure is as follows:
1) cement block of test specimen poured is caught on by the upper opening slot of T-type fixing groove, and the lower edge of the fiber of test specimen is sticked on paper
It is fixedly clamped with the pneumatic chuck of test equipment；
2) using displacement Loading Method, fiber is slowly tightened to strong and is generated, then start to add with 0.1 millimeter of speed per minute
Row test is loaded into until FRP rebar or fracture, test terminate.
The present invention provides a kind of novel changable thickness single fiber pull-out cement base test piece mould, including bottom plate, frame, vertical
Module and demarcation plate above and below column, flank.Its central post is the metal block there are two fixation hole and a screw hole, passes through screw rod and uses
It is the positioning device of flank module in the fixation of flank lower module.Frame is common rectangular frame, but needs to paste in advance fine
It ties up to designated position, is used for anchoring fiber.Demarcation plate is inserted into the formation of two sides flank module in one of them stage poured
In slot, for separating each test specimen, which can be designed as the multiple test specimens of primary concreting, need to only design the slot of respective numbers
With partition.Because flank lower module can slide on the screw rod connecting with column, its position is then secured with nuts, from
And control the thickness for pouring test specimen.
Its advantages are as follows:
1, can be with the multiple single fiber pull-out cement base test specimens of primary concreting, structure is simple, strong operability, and demoulding is more held
Easily.
2, have divider plate between each test specimen, it is independent to form, and can by adjust the position of flank module come
The thickness for pouring test specimen is adjusted, to eliminate the cutting process in conventional method, has evaded cutting and has caused fiber/matrix interface
The risk of destruction.
Detailed description of the invention
Fig. 1 is schematic diagram before inventive die assembles；
Fig. 2 is schematic diagram after inventive die assembling；
Fig. 3 is test specimen schematic diagram of the present invention；
Fig. 4 is test process schematic diagram of the present invention；
In figure: 1. bottom plates；2, frame；3, column；4, flank lower module；5, flank upper module；6, demarcation plate；7, fiber；8, it pours
The cement block built；9, T-type fixing groove；10, hardboard；11, pneumatic chuck.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing:
The present invention provides a kind of variable thickness single fiber pull-out cement base test piece mould and adjusting and test method, can not damage
The single fiber pull-out cement base test specimen of specified thickness is obtained under the premise of losing test specimen.The present invention can be with the multiple single fibers of primary concreting
Dimension extracts cement base test specimen, and structure is simple, and strong operability, demoulding is relatively easy to, and has between demarcation plate between each test specimen
Every, it is independent to form, and the thickness for pouring test specimen can be adjusted by adjusting the position of flank module, to eliminate tradition
Cutting process in method has evaded the risk that cutting causes fiber/matrix interfacial failure.
Attached drawing 1 and attached drawing 2 respectively illustrate the preceding state with after assembling of mold assembling.With reference to the accompanying drawing to the present invention
It further explains.
Such as attached drawing 1, novel single fiber pull-out test piece mould, novel changable thickness single fiber pull-out cement base test piece mould,
Frame 2 including bottom plate 1, for being laid with fiber, the column 3 being fixed on bottom plate, flank lower module 4, flank upper module 5 and
Demarcation plate 6.
Wherein: flank lower module 4 and flank upper module 5 each two；Demarcation plate 6 five；Bottom plate 1 and frame 2 pass through four
Screw connection；Bottom plate 1 passes through two screws with two columns respectively and connects；Flank lower module 4 is connected by screw rod and column 3；
Flank upper module 5 is connected with flank lower module 4 by screw；Demarcation plate 6 is then with flank lower module 4, flank upper module 5 by inserting
Enter fixation, is not bolted.
The flank lower module 4, flank upper module 5 all cut two kinds of slot positions, the first slot position is to easily will
Flank lower module 4, flank upper module 5 are connect with column 3, are the vacancy reserved to column 3.Second of slot position is dedicated for slotting
Enter demarcation plate 6, each test specimen casting position is separated.
Flank lower module 4, flank upper module 5 are connected by screw to, but do not connect with bottom plate, it is therefore an objective in screw rod direction energy
It is moved, facilitates adjustment specimen thickness.
Each column 3 is connect by two screws with bottom plate, is completely fixed.There is screw rod to pass through among column, flank lower die
Block 4 is bolted with this, and determines position by the way that both ends nut is fixed, thus adjust pour specimen thickness (can between 0mm-20mm
It adjusts).
The thickness of frame 2 is equal to the thickness of flank lower module 4, thus above and below realizing that laying fiber can be directly through flank
Gap between module.
The method for thickness regulation of novel changable thickness single fiber pull-out cement base test piece mould of the present invention, including pour
Process and demoulding process；
Pour process are as follows:
1 determines position of fibers on frame, pastes fiber.Column is fixed on bottom plate, screw rod is put on.
2 slide into flank lower module along screw rod, and two sides are secured with nuts, measure at this time two sides flank lower module away from
From that is, determining specimen thickness.Vertical columns and flank lower module at this time.
3 the middle position of bottom plate, flank lower module, the side of flank upper module and partition side oiling.It is ready to
Cement base slurry.
4 are inserted into demarcation plates, form a unilateral opening slot between two flank lower modules.Matrix is poured into slot, due to
Space very little, is vibrated with fine needle.
5 are put into the frame for being pasted with fiber from above, connect and are completely fixed with bottom plate.Fiber is just fallen in each at this time
Among test specimen casting position, make fiber inlet part matrix outstanding as far as possible.
6 are stacked to flank upper module on flank lower module, are completely fixed.The slot of matrix is poured into originally at this time toward enterprising
It has gone extension, has poured into new matrix, and vibrated in two sides with small tool, fiber cannot be touched.Slight vibrating mould makes matrix
It is closely knit.Concordant with flank upper module at the top of matrix, top is contacted with air.Mold is as shown in Fig. 2 at this time, which has poured
At can be conserved.
Demoulding process are as follows:
1 extracts demarcation plate, and the adhesive portion of fiber is removed from frame.
2 release the connecting screw of flank upper module and flank lower module, remove flank upper module.
3 release locking of the flank lower module on screw rod, slowly whole to release flank lower module, i.e. dismounting flank lower die
Block.
4 acquisition centers are inserted with the rectangular coupon of fiber.
The test method of variable thickness single fiber pull-out cement base test piece mould of the present invention, the test specimen includes fiber
With the cement block poured, testing procedure is as follows:
1) cement block of test specimen poured is caught on by the upper opening slot of T-type fixing groove, and the lower edge of the fiber of test specimen is sticked on paper
It is fixedly clamped with the pneumatic chuck of test equipment, in order to fix the extraction test specimen, applicant devises dedicated T-type and fixes
The pneumatic chuck of slot, lower edge test equipment is fixedly clamped, and upper opening slot is used to catch on the cement matrix portion for extracting test specimen
Point.Compared to traditional direct clamping cement matrix way or cement matrix is clung, glue can be neutralized in this way to avoid stress collection
Influence of the water to fiber tail portion, while installation is also very quick, the fiber part of test piece upper part is bonded in cardboard using 502 glue
On plate, and hardboard is clamped with pneumatic joint, can guarantee that Relative sliding will not occur for fiber in this way.
2) using displacement Loading Method, fiber is slowly tightened to strong and is generated, then opened with 0.1 millimeter of speed per minute
Begin to load and carries out test until FRP rebar or fracture, test terminate.
The above described is only a preferred embodiment of the present invention, being not the limit for making any other form to the present invention
System, and made any modification or equivalent variations according to the technical essence of the invention, still fall within present invention model claimed
It encloses.
Claims (6)
1. variable thickness single fiber pull-out cement base test piece mould, including bottom plate (1), frame (2), column (3), flank lower module
(4), flank upper module (5) and demarcation plate (6), it is characterised in that: four angles and frame (2) of the bottom plate (1) pass through four
Screw connection, the bottom plate (1) pass through two screws with two columns respectively and connect, and two flank lower module (4) two sides pass through
Screw rod passes through corresponding column (3) connection, and the flank upper module (5) is on flank lower module (4) and corresponding flank lower module (4)
It is connected by screw, the fiber (7) is between flank upper module (5) and flank lower module (4), demarcation plate (6) inserting
In the slot of flank lower module (4) and flank upper module (5).
2. variable thickness single fiber pull-out cement base test piece mould according to claim 1, it is characterised in that: the separation
Plate (6) has 3-5.
3. variable thickness single fiber pull-out cement base test piece mould according to claim 1, it is characterised in that: the frame
(2) thickness is equal to the thickness of flank lower module (4).
4. the thickness adjusting side of variable thickness single fiber pull-out cement base test piece mould according to claim 1 to 3
Method, including pour process and demoulding process, it is characterised in that:
It is described that pour process step as follows:
1) fiber (7) position is determined on frame (2), pastes fiber (7), column (3) is fixed on bottom plate (1), is put on
Screw rod；
2) flank lower module (4) is slid into along screw rod, two sides are secured with nuts, measure between the flank lower module (4) of two sides
Distance determines specimen thickness, at this time vertical columns (3) and flank lower module (4)；
3) the middle position of bottom plate (1), flank lower module (4), the side of flank upper module (5) and demarcation plate (6) side
Oiling gets out cement base slurry；
4) demarcation plate (6) are inserted into, form a unilateral opening slot between two flank lower modules (4), matrix is poured into slot, by
In space very little, vibrated with tool；
5) frame (2) for being pasted with fiber (7) is put into from above, connect and is completely fixed with bottom plate (1), fiber (7) is being just at this time
It falls in well among each test specimen casting position, makes fiber (7) inlet part matrix outstanding as far as possible；
6) flank upper module (5) is stacked on flank lower module (4), is completely fixed, the slot for pouring into matrix originally at this time is past
On extended, pour into new matrix, and vibrated in two sides with tool, fiber cannot be touched, slight vibrating mould makes base
Matter is closely knit, and concordant with flank upper module at the top of matrix, top is contacted with air, which pours completion；
The demoulding process step is as follows:
1) demarcation plate (6) are extracted, the adhesive portion of fiber (7) is removed from frame (2)；
2) connecting screw for releasing flank upper module (5) and flank lower module (4), is removed flank upper module (5)；
3) locking of flank lower module (5) on screw rod is released, it is slowly whole to release flank lower module (4), i.e., under dismounting flank
Module (4)；
4) acquisition center is inserted with the rectangular coupon of fiber (7).
5. the method for thickness regulation of variable thickness single fiber pull-out cement base test piece mould according to claim 4, special
Sign is that described vibrate with tool is needle.
6. the test method of variable thickness single fiber pull-out cement base test specimen according to claim 1 to 3, described
Test specimen includes fiber (7) and the cement block (8) poured, and testing procedure is as follows, it is characterised in that:
1) cement block (8) of test specimen poured is caught on by the upper opening slot of T-type fixing groove (9), the lower edge of the fiber (7) of test specimen
It is sticked on paper (10) and is fixedly clamped with the pneumatic chuck (11) of test equipment；
2) using displacement Loading Method, fiber is slowly tightened to strong and is generated, then start to add with 0.1 millimeter of speed per minute
Row test is loaded into until FRP rebar or fracture, test terminate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910141654.9A CN109822724B (en) | 2019-02-26 | 2019-02-26 | Variable-thickness single fiber drawn cement-based test piece mold and adjusting and testing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910141654.9A CN109822724B (en) | 2019-02-26 | 2019-02-26 | Variable-thickness single fiber drawn cement-based test piece mold and adjusting and testing method |
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| CN109822724B CN109822724B (en) | 2020-10-02 |
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| CN110315305A (en) * | 2019-06-11 | 2019-10-11 | 湖北锐世数字医学影像科技有限公司 | A kind of crystal provision for disengagement |
| CN110487715A (en) * | 2019-08-23 | 2019-11-22 | 淮阴工学院 | A kind of high ductility cement-based material Single fiber pull-out test device and test method |
| CN110530722A (en) * | 2019-10-15 | 2019-12-03 | 淮阴工学院 | High ductility cement-based material is uniaxially stretched mold and test specimen preparation method and test method |
| CN110702492A (en) * | 2019-09-20 | 2020-01-17 | 同济大学 | Bidirectional single fiber pulled cement matrix test piece mold and manufacturing and application thereof |
| CN111175114A (en) * | 2020-01-17 | 2020-05-19 | 长安大学 | Molding test mold and method for chopped fiber-cement-based material test piece |
| CN111198155A (en) * | 2020-01-13 | 2020-05-26 | 西南交通大学 | Sample forming device and method for flexible fiber drawing test |
| CN113310780A (en) * | 2021-05-25 | 2021-08-27 | 北京中煤矿山工程有限公司 | Preparation method of cement grouting soil block for laboratory |
| CN113702122A (en) * | 2021-08-06 | 2021-11-26 | 常州工学院 | Sample preparation method for testing pulling behavior of flexible fibers in cement matrix |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110315305A (en) * | 2019-06-11 | 2019-10-11 | 湖北锐世数字医学影像科技有限公司 | A kind of crystal provision for disengagement |
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| CN110530722A (en) * | 2019-10-15 | 2019-12-03 | 淮阴工学院 | High ductility cement-based material is uniaxially stretched mold and test specimen preparation method and test method |
| CN110530722B (en) * | 2019-10-15 | 2022-05-10 | 淮阴工学院 | High-ductility cement-based material uniaxial tension die, test piece manufacturing method and test method |
| CN111198155A (en) * | 2020-01-13 | 2020-05-26 | 西南交通大学 | Sample forming device and method for flexible fiber drawing test |
| CN111175114A (en) * | 2020-01-17 | 2020-05-19 | 长安大学 | Molding test mold and method for chopped fiber-cement-based material test piece |
| CN113310780A (en) * | 2021-05-25 | 2021-08-27 | 北京中煤矿山工程有限公司 | Preparation method of cement grouting soil block for laboratory |
| CN113702122A (en) * | 2021-08-06 | 2021-11-26 | 常州工学院 | Sample preparation method for testing pulling behavior of flexible fibers in cement matrix |
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