CN105158069A - Method for measuring tensile strength of whole fiber bundle for cement and concrete - Google Patents
Method for measuring tensile strength of whole fiber bundle for cement and concrete Download PDFInfo
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- CN105158069A CN105158069A CN201510473489.9A CN201510473489A CN105158069A CN 105158069 A CN105158069 A CN 105158069A CN 201510473489 A CN201510473489 A CN 201510473489A CN 105158069 A CN105158069 A CN 105158069A
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Abstract
The invention discloses a method for measuring the tensile strength of a whole fiber bundle for cement and concrete, and belongs to the technical field of measurement of fiber strength. The method comprises: coating and binding two ends of a to-be-measured fiber bundle with two pieces of kraft paper and an epoxy resin; clamping the two ends, bound and coated with kraft paper, of the to-be-measured fiber bundle with two clamps for measurement of the tensile strength; and performing measurement of the tensile strength. According to the invention, the two ends of the fiber bundle are bound and coated with kraft paper, thereby enabling the clamps not to directly contact the glass fiber bundle, so that the problem that clamped fiber is damaged during clamping through the clamps is overcome, and slipping of the clamped fiber during a pulling process is effectively prevented. The measurement efficiency is improved, and the detected data is objective and accurate.
Description
Technical field
The invention belongs to fibre strength technical field of measurement and test.
Background technology
Cement and concrete is current topmost manufactured construction materials, traditional concrete have impervious poor, easily split, the easy distinct disadvantage such as generation brittle rupture, but in concrete, add fiber can obviously improve these shortcomings.But the intensity of fiber directly affects the intensity of fibre reinforced composites, detection is carried out to the intensity of whole bundle fiber and seems particularly important.
The method of existing whole bundle fiber pulling strengrth test is: the whole bundle fiber intercepting certain length by testing requirements, the two ends of whole bundle fiber are directly clamped in respectively on two fixtures, start detector, wherein one is made to be subjected to displacement between fixture and another fixture, whole bundle fiber is ruptured under stretch, record pulling force now with this, be the pulling strengrth of whole bundle fiber.But due to whole bundle fiber thinner thickness, in drawing process, the few fibers be clamped on the fixture of strength tester can produce slippage, so cause the data generation deviation detected.
Therefore, be necessary to improve whole bundle strength method of testing.
Summary of the invention
The present invention seeks in the whole bundle fiber process of clamping, to produce fibre damage in order to solving, and produce sliding phenomenon in drawing process and design a kind of method for whole bundle fiber pulling strengrth test.
The present invention includes following steps:
1) sample prepares: by epoxy resin, by the two ends of fibrous bundle to be measured respectively with two kraft bonding parcels;
2) clamp, test: the two ends of the fibrous bundle to be measured of kraft bonding parcel are clamped on two fixtures of pulling strengrth test respectively, then carry out pulling strengrth test.
Sample set-up procedure of the present invention is simple, it is crucial that: the present invention is by the two ends of the fibrous bundle of kraft bonding parcel, fixture is not in direct contact with on glass fiber bundle, overcome the problem that fixture damages holding portion fiber in clamping process, also can effectively prevent in drawing process by the phenomenon of pars fibrosa generation slippage clamped, improve conventional efficient, also make the data that detect objective, accurate.
Kraft before each bonding parcel is the matts shape paper that continuous print two is identical; By one end of fibrous bundle to be measured by the center line of an epoxy resin bonding matts shape paper wherein, then by another matts shape paper and the matts shape paper phase doubling being bonded with fibrous bundle to be measured, fibrous bundle to be measured is clamped in kraft.
Accompanying drawing explanation
Fig. 1 is a physical dimension figure with the identical matts shape kraft of continuous print two.
Fig. 2 is the schematic diagram after posting fibrous bundle.
Fig. 3 is the sample design sketch after having prepared.
Embodiment
Further illustrate the present invention by reference to the accompanying drawings:
1, sample prepares:
Get the kraft of two long 40cm, wide 20cm, on each paper, draw two identical matts shapes with length of side 10cm, as shown in Figure 1.Wherein, 1 is position line, line centered by 2.
By stretching for glass fiber bundle 3 to be measured, and its two ends are laid respectively in the position line of a matts shape of two kraft, and by epoxy resin 4, the two ends of glass fiber bundle 3 to be measured are cemented with two kraft respectively.As shown in Figure 2.
Then by another matts shape paper and the matts shape paper phase doubling being bonded with glass fiber bundle 3 to be measured, glass fiber bundle 3 to be measured is clamped in kraft.As shown in Figure 3.
2, clamp, test:
The two ends of the glass fiber bundle to be measured 3 of kraft bonding parcel are clamped on two fixtures of pulling strengrth test respectively, then carry out pulling strengrth test.
Read fracture strength after whole bundle fiber fracture, successively strength test is carried out to whole bundle fiber sample.
3, get the glass fiber bundle that same batch is produced, test respectively with original method (direct chucking method) and the inventive method, the Comparative result table obtained is as follows:
| Numbering | Powerful (N) (use this method) | Powerful (N) (original method) |
| 1 | 24.60 | 7.10 |
| 2 | 26.40 | 26.50 |
| 3 | 30.10 | 19.40 |
| 4 | 23.10 | 25.90 |
| 5 | 29.90 | 21.60 |
| 6 | 28.00 | 24.30 |
| 7 | 25.40 | 22.70 |
| 8 | 28.90 | 29.30 |
| 9 | 31.20 | 30.60 |
| 10 | 28.90 | 21.70 |
| 11 | 25.40 | 26.50 |
| 12 | 23.10 | NG |
| 13 | 24.30 | 25.80 |
| 14 | 25.60 | 24.40 |
| 15 | 28.10 | 27.80 |
| 16 | 22.90 | 26.70 |
| 17 | 23.80 | 26.00 |
| Mean value | 26.45 | 24.14 |
| The coefficient of variation (%) | 9.96 | 21.63 |
Known compared with the data that the data that the application of the invention method obtains and original method obtain, the powerful coefficient of variation of this method is much smaller than original method, illustrate that the undulatory property of this method data is significantly less than original method, average ultimate strength is higher than the average ultimate strength of original method, this causes because original method easily causes damage to fiber, and does not occur in process of the test that fiber slippage causes reading the phenomenon of test figure.
In addition, basalt fibre, vinal or mekralon are substituted the glass fibre of above test, also can obtain similar effect.
Claims (3)
1., for the method that cement and concrete is tested by whole bundle fiber pulling strengrth, it is characterized in that following steps:
1) sample prepares: by epoxy resin, by the two ends of fibrous bundle to be measured respectively with two kraft bonding parcels;
2) clamp, test: the two ends of the fibrous bundle to be measured of kraft bonding parcel are clamped on two fixtures of pulling strengrth test respectively, then carry out pulling strengrth test.
2. method according to claim 1, is characterized in that the kraft before each bonding parcel is the matts shape paper that continuous print two is identical; By one end of fibrous bundle to be measured by the center line of an epoxy resin bonding matts shape paper wherein, then by another matts shape paper and the matts shape paper phase doubling being bonded with fibrous bundle to be measured, fibrous bundle to be measured is clamped in kraft.
3. method according to claim 1, is characterized in that described fiber is any one in glass fibre, basalt fibre, vinal or mekralon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473489.9A CN105158069A (en) | 2015-08-05 | 2015-08-05 | Method for measuring tensile strength of whole fiber bundle for cement and concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473489.9A CN105158069A (en) | 2015-08-05 | 2015-08-05 | Method for measuring tensile strength of whole fiber bundle for cement and concrete |
Publications (1)
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| CN105158069A true CN105158069A (en) | 2015-12-16 |
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| CN201510473489.9A Pending CN105158069A (en) | 2015-08-05 | 2015-08-05 | Method for measuring tensile strength of whole fiber bundle for cement and concrete |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840864A (en) * | 2017-03-22 | 2017-06-13 | 江苏工程职业技术学院 | A kind of fiber strength machine Special clamping device |
| CN108225865A (en) * | 2018-01-19 | 2018-06-29 | 扬州大学 | A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped |
| CN108844822A (en) * | 2018-06-13 | 2018-11-20 | 扬州大学 | A method of for detecting chopped strand alkaline resistance properties |
| CN108871953A (en) * | 2018-06-13 | 2018-11-23 | 扬州大学 | A method of for detecting fiber alkaline resistance properties |
| CN110146351A (en) * | 2018-12-14 | 2019-08-20 | 卡本科技股份有限公司 | A kind of carbon fiber mesh tensile strength test preparation method of reinforced sheet |
| CN108318303B (en) * | 2018-01-19 | 2021-02-05 | 扬州大学 | Tensile test manufacturing method for synthetic coarse fibers in concrete |
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| CN203629959U (en) * | 2013-12-24 | 2014-06-04 | 国家电网公司 | Carbon fiber reinforced tensile testing machine and clamp for detecting carbon fiber multifilament reinforced tensile test |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840864A (en) * | 2017-03-22 | 2017-06-13 | 江苏工程职业技术学院 | A kind of fiber strength machine Special clamping device |
| CN108225865A (en) * | 2018-01-19 | 2018-06-29 | 扬州大学 | A kind of test specimen production method of the fixed cement concrete tension test for the bundle fiber that is chopped |
| CN108318303B (en) * | 2018-01-19 | 2021-02-05 | 扬州大学 | Tensile test manufacturing method for synthetic coarse fibers in concrete |
| CN108844822A (en) * | 2018-06-13 | 2018-11-20 | 扬州大学 | A method of for detecting chopped strand alkaline resistance properties |
| CN108871953A (en) * | 2018-06-13 | 2018-11-23 | 扬州大学 | A method of for detecting fiber alkaline resistance properties |
| CN108844822B (en) * | 2018-06-13 | 2021-03-26 | 扬州大学 | Method for detecting alkali resistance of chopped fibers |
| CN110146351A (en) * | 2018-12-14 | 2019-08-20 | 卡本科技股份有限公司 | A kind of carbon fiber mesh tensile strength test preparation method of reinforced sheet |
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Application publication date: 20151216 |
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