CN108225865A - A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped - Google Patents
A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped Download PDFInfo
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- CN108225865A CN108225865A CN201810052896.6A CN201810052896A CN108225865A CN 108225865 A CN108225865 A CN 108225865A CN 201810052896 A CN201810052896 A CN 201810052896A CN 108225865 A CN108225865 A CN 108225865A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- Life Sciences & Earth Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A kind of fixed cement concrete test specimen production method of the tension test for the bundle fiber that is chopped, belongs to fiber for cement concrete strength test technical field.The present invention makes sample set-up procedure simple by mold, and multiple samples can be made simultaneously.It is crucial that：The present invention wraps up both ends of the cement concrete with the bundle fiber that is chopped by the shiny surface of the small scraps of paper of square, fixture is made to be not directly contacted in cement concrete on chopped bundle fiber, solve the problems, such as that fixture damages fiber in clamping process, pass through seccotine, can effectively prevent fixture clamp not strongly and method it is improper and cause cement concrete be chopped bundle fiber slip the phenomenon that, test efficiency is improved, also makes the data of detection objective, accurate.
Description
Technical field
The invention belongs to fiber for cement concrete strength test technical fields.
Background technology
The rich and influential family that concrete is consumed as architectural engineering, traditional concrete have that volume contraction is big, and not corrosion-resistant grade is apparent
Shortcoming, fiber is added in concrete can be obviously improved concrete these shortcomings, and cement concrete is made with the bundle fiber that is chopped
For common fiber in China's engineering, intensity directly affects the performance of fibre reinforced composites, to cement concrete with short
The intensity for cutting bundle fiber is detected and is particularly important.
The method of traditional fiber：By the fiber of test requirements document interception certain length, the both ends of fiber are clamped directly at two
On a fixture, detector is started, makes to be subjected to displacement between a fixture therein and an other fixture, makes fiber under stretch
It is broken, the intensity of pulling force, as fiber at this time is recorded with this.This method is only applicable to the sufficiently long fiber of length,
In addition, due to fixture when accommodating the chopped bundle fiber of cement concrete there are the non-uniform situation of clamping force, can cause short
The concentration of local stress at pencil fiber for cement concrete fixture is cut, and for the cement concrete bundle fiber meeting that is chopped
The phenomenon that causing its sliding, therefore, often the above data detected are not that cement concrete is being stretched with chopped bundle fiber
The accurate data reflection of fiber in the process, for current test method for the cement concrete pencil Fiber Tensile Test that is chopped
Blank, also, above-mentioned traditional detection method is easy to that cement concrete is caused to damage and be detected with chopped bundle fiber
Deviation occurs for data.
Therefore, it is necessary to it is improved with chopped strand strength test method for cement concrete, is perfect.
Invention content
The invention aims to solve traditional method of clamping to cement concrete be chopped bundle fiber damage and
It slides and causes one kind that prohibited data detection is true and designs for the cement concrete pencil tensile strength of fiber test that is chopped
Test specimen production method.
The present invention includes the following steps：
1）The preparation of die assembly：Die assembly is mainly made of pedestal, two groups of frame moulds and several buckles；Pedestal is equipped with tool
There is the straight sliding rail of scale, the side of each group of frame mould is equipped with the sliding block coordinated with straight sliding rail, passes through sliding block and straight
The cooperation of sliding rail, and passing through buckle makes sliding block be located on straight sliding rail；Each group of frame mould upper surface sets several slot positions；
2）The preparation of the fixed paper of square：
By when hair the sheet trimming of light draw ten into several small scraps of paper of square, then in the smooth surface of each small scraps of paper of square
Wordline, to form symmetrical matts；
3）The making of sample：
By movement of the sliding block on straight sliding rail, the length of fiber samples according to needed for experiment, determine two groups of frame moulds it
Between spacing, and the both ends of the sliding block in each frame mould pass through snaps into position respectively；
After smearing interleaving agent in the opposite slot position of every group of frame mould, then the small scraps of paper of square are put into each slot position, and
Make the smooth face-up of the small scraps of paper of square；Then the both ends of chopped bundle fiber are individually placed to the center of the small scraps of paper of square
Place and with cross cross in a line overlap；Contact of the chopped bundle fiber with the small scraps of paper of square is applied to seccotine
Position, then the smooth one side cover it by another piece of small scraps of paper of square；
It stands, after being firmly bonded respectively with two pairs of small scraps of paper of square wait the both ends for the bundle fiber that is chopped, removes, obtain in slot position
To the tensile test piece glued.
The present invention makes sample set-up procedure simple by mold, and multiple samples can be made simultaneously.It is crucial that：
The present invention wraps up both ends of the cement concrete with the bundle fiber that is chopped by the shiny surface of the small scraps of paper of square, makes fixture not direct
Contact, with being chopped on bundle fiber, solves the problems, such as that fixture damages fiber in clamping process, by strong in cement concrete
Power glue, can effectively prevent fixture clamp not strongly and method it is improper and cause cement concrete be chopped bundle fiber slip showing
As improving test efficiency, also making the data of detection objective, accurate.
In short, the present invention solves fixture during blessing to the damage of fiber, effectively prevent fixture clamp not strongly and
The phenomenon that causing fiber slippage, broken end makes data objective, accurate.
Additionally by the cross hairs drawn on the small scraps of paper of square, it can both ensure that chopped bundle fiber can be cemented in pros
The small scraps of paper center of shape, can make the perpendicular fixation in one side of chopped bundle fiber and the small scraps of paper of square, in favor of that will be tried in the later stage
After the clamping of the fixture of sample and tester, the bundle fiber that makes to be chopped is horizontal by vertical direction, conducive to the essence of test is improved
Accuracy.
Further, the paper of the light of the present invention when hair is sand paper, brown paper or acrylic board.
The size of each slot position is identical with the size of the small scraps of paper of square.Doing so can make to avoid test specimen
The rubbing of the square scraps of paper in journey and caused by test specimen destroy, the success rate that increase test specimen makes.
After contact site of the chopped bundle fiber with the small scraps of paper of square is applied to seccotine, then in the small paper of square
Seccotine is added dropwise in four corners of piece respectively.The part that the small scraps of paper of square and fiber contacts can be conveyed fully connects with binding agent
It touches, will not generate causes internal binding agent to be sent out with air insulated and then the subsequent adhesion strength of influence due to the overfill of painting
Exhibition.
After covering another piece of small scraps of paper of square, then apply external force, so that the two panels small scraps of paper of square and chopped pencil are fine
It is bonded between dimension.
The present invention can survey the chopped bundle fiber such as glass fibre, basalt fibre, carbon fiber or synthetic fibers
Examination.
In order to improve caking property, the seccotine is 3M multi-use mucilages, 171 strength Instant cements or strength weld AB glue water.
Description of the drawings
Fig. 1 uses schematic diagram for inventive die.
Fig. 2 is the schematic diagram of the small sand paper of square.
Fig. 3 is the schematic diagram of sample obtained.
Specific embodiment
First, mould structure explanation：
As shown in Figure 1, die assembly is mainly made of 1, two group of frame mould 2 of pedestal and several buckles 3.
Pedestal 1 is equipped with the straight sliding rail 1-1 with scale, and the side of each group of frame mould 2 is equipped with and straight sliding rail 1-1
The sliding block 2-1 of cooperation by the cooperation of sliding block 2-1 and straight sliding rail 1-1, can be made sliding block 2-1 be located in straight by buckle 3 and be slided
On rail 1-1.
Each group of 2 upper surface of frame mould sets several slot position 2-2, the length and width of each slot position 2-2 be respectively 20mm and
20mm。
2nd, prepare sample for being chopped pencil glass fibre：
By movements of the sliding block 2-1 on straight sliding rail 1-1, the length of fiber samples according to needed for experiment determines two groups of frame shapes
Spacing between mold 2, and the both ends of the sliding block 2-1 in each frame mould 2 are fixed respectively by buckle 3.
Sand paper is taken to be cut into the small sand paper 4 of square of several 20mm × 20mm, with pen by each small sand paper of square
Shiny surface mark signature line, to form symmetrical matts, as shown in Figure 2.
Interleaving agent is uniformly smeared in the opposite slot position 2-2 of two groups of frame moulds 2（Or releasing agent）, then in each slot position 2-
The small sand paper 4 of square handled well is put into 2, and is paid attention to the smooth face-up of the small sand paper 4 of square, each slot position 2-2
Place the small sand paper 4 of a square.
One during the end of chopped pencil glass fibre 5 is placed at small 4 center of sand paper of square and is crossed with cross
Bar line overlaps, and beyond the distalmost end of the small sand paper 4 of square.
The contact site of chopped pencil glass fibre 5 and the small sand paper 4 of square is applied to seccotine, then respectively just
Four corner drop coating seccotines of rectangular small sand paper 4.
The smooth cover for the small sand paper 4 of square that another piece is handled well again on it, and makes the small sand paper 4 of the square
Cross scribing line in end of the line also with chopped pencil glass fibre 5 overlap, then pinned with tweezers after ensuring to cling
Unclamp tweezers.
The other end for the pencil glass fibre 5 that is chopped is handled by above-mentioned steps.
It stands for 24 hours, after being firmly bonded respectively with a pair of of small sand paper 4 of square wait the end for the pencil glass fibre 5 that is chopped, from
It is removed in the slot position 2-2 of mold, the tensile test piece glued.
2nd, tension test：
Test apparatus：Chopped strand Tensile Tester.
A chopped pencil fiberglass tensile sample is taken, two test fixtures of tester are clamped in respectively and are had respectively
There are the both ends of chopped pencil glass fibre that sand paper wraps up, the clamp distance for often holding sample is 10mm.
After the completion of ensuring clamping, the tension test of chopped pencil glass fibre is carried out.
Fracture strength is read after the pencil that is chopped glass fibre fracture, each sample is stretched successively later and is read disconnected
Resistance to spalling.
Operating method successively again repeatedly carries out tension test one by one to other pencil fiberglass tensile samples that are chopped.
3rd, sample, data such as following table are carried out according to the method for the invention：
As test data it is found that according to obtained by the stretching test method of chopped pencil fiber for cement concrete of the present invention
The result of the test coefficient of variation meet stretch requirement of the string proof test to the data coefficient of variation enough（The coefficient of variation<30%）.
In addition, test method according to the present invention takes turns doing 100 experiments, only several times due to artificially dealing with improperly
The sliding of fiber is caused, remaining does not generate sliding.
Claims (7)
1. a kind of fixed cement concrete test specimen production method of the tension test for the bundle fiber that is chopped, it is characterised in that including
Following steps：
1）The preparation of die assembly：Die assembly is mainly made of pedestal, two groups of frame moulds and several buckles；Pedestal is equipped with tool
There is the straight sliding rail of scale, the side of each group of frame mould is equipped with the sliding block coordinated with straight sliding rail, passes through sliding block and straight
The cooperation of sliding rail, and passing through buckle makes sliding block be located on straight sliding rail；Each group of frame mould upper surface sets several slot positions；
2）The preparation of the fixed paper of square：
By when hair the sheet trimming of light draw ten into several small scraps of paper of square, then in the smooth surface of each small scraps of paper of square
Wordline, to form symmetrical matts；
3）The making of sample：
By movement of the sliding block on straight sliding rail, the length of fiber samples according to needed for experiment, determine two groups of frame moulds it
Between spacing, and the both ends of the sliding block in each frame mould pass through snaps into position respectively；
After smearing interleaving agent in the opposite slot position of every group of frame mould, then the small scraps of paper of square are put into each slot position, and
Make the smooth face-up of the small scraps of paper of square；Then the both ends of chopped bundle fiber are individually placed to the center of the small scraps of paper of square
Place and with cross cross in a line overlap；Contact of the chopped bundle fiber with the small scraps of paper of square is applied to seccotine
Position, then the smooth one side cover it by another piece of small scraps of paper of square；
It stands, after being firmly bonded respectively with two pairs of small scraps of paper of square wait the both ends for the bundle fiber that is chopped, removes, obtain in slot position
To the tensile test piece glued.
It is 2. special according to the test specimen production method for requiring the 1 fixed cement concrete tension test for the bundle fiber that is chopped
Sign is：The paper of the light when hair is sand paper, brown paper or acrylic board.
It is 3. special according to the test specimen production method for requiring the 1 fixed cement concrete tension test for the bundle fiber that is chopped
Sign is：The size of each slot position is identical with the size of the small scraps of paper of square.
It is 4. special according to the test specimen production method for requiring the 1 fixed cement concrete tension test for the bundle fiber that is chopped
Sign is：After contact site of the chopped bundle fiber with the small scraps of paper of square is applied to seccotine, then in the small paper of square
Seccotine is added dropwise in four corners of piece respectively.
It is 5. special according to the test specimen production method for requiring the 4 fixed cement concrete tension tests for the bundle fiber that is chopped
Sign is：After covering another piece of small scraps of paper of square, then apply external force, so that the two panels small scraps of paper of square and chopped bundle fiber
Between bond.
6. according to the test specimen system for requiring the 1 or 2 or 3 or 4 or 5 fixed cement concrete tension tests for the bundle fiber that is chopped
Make method, it is characterised in that：The chopped bundle fiber is glass fibre, basalt fibre, carbon fiber or synthetic fibers.
7. according to the test specimen system for requiring the 1 or 2 or 3 or 4 or 5 fixed cement concrete tension tests for the bundle fiber that is chopped
Make method, it is characterised in that：The seccotine is 3M multi-use mucilages, 171 strength Instant cements or strength weld AB glue water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810052896.6A CN108225865A (en) | 2018-01-19 | 2018-01-19 | A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810052896.6A CN108225865A (en) | 2018-01-19 | 2018-01-19 | A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped |
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| Publication Number | Publication Date |
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| CN108225865A true CN108225865A (en) | 2018-06-29 |
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|---|---|---|---|
| CN201810052896.6A Pending CN108225865A (en) | 2018-01-19 | 2018-01-19 | A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632464A (en) * | 2018-12-04 | 2019-04-16 | 核工业第八研究所 | A kind of fiber impregnation yarn tensile sample reinforces end preparation facilities and its application |
| CN110376033A (en) * | 2019-07-10 | 2019-10-25 | 东北石油大学 | A kind of high intensity fracture hole type rock core and preparation method thereof |
| 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 |
| CN114279838A (en) * | 2021-12-20 | 2022-04-05 | 扬州大学 | Tensile test manufacturing method for filament fibers |
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| CN110376033A (en) * | 2019-07-10 | 2019-10-25 | 东北石油大学 | A kind of high intensity fracture hole type rock core and preparation method thereof |
| 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 |
| CN114279838A (en) * | 2021-12-20 | 2022-04-05 | 扬州大学 | Tensile test manufacturing method for filament fibers |
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Application publication date: 20180629 |
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