CN210880134U - Strain hardening cement-based composite material test mold - Google Patents
Strain hardening cement-based composite material test mold Download PDFInfo
- Publication number
- CN210880134U CN210880134U CN201920479235.1U CN201920479235U CN210880134U CN 210880134 U CN210880134 U CN 210880134U CN 201920479235 U CN201920479235 U CN 201920479235U CN 210880134 U CN210880134 U CN 210880134U
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- test
- strain hardening
- composite material
- based composite
- hardening cement
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- 238000012360 testing method Methods 0.000 title claims abstract description 77
- 239000000463 material Substances 0.000 title claims abstract description 23
- 239000011182 bendable concrete Substances 0.000 title claims abstract description 14
- 238000005192 partition Methods 0.000 claims abstract description 15
- 239000002131 composite material Substances 0.000 claims description 7
- 238000005482 strain hardening Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000002146 bilateral effect Effects 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 12
- 238000009864 tensile test Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241000870659 Crassula perfoliata var. minor Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 102000002013 Transforming Protein 3 Src Homology 2 Domain-Containing Human genes 0.000 description 1
- 108010040633 Transforming Protein 3 Src Homology 2 Domain-Containing Proteins 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910001095 light aluminium alloy Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The utility model provides a strain hardening cement-based composite material test mold, which comprises a bottom plate, two end templates, a plurality of transverse partition plates, a threaded rod and a locking nut; the mold produces a test piece of uniform cross section and having a sufficiently strong smooth surface. The hydraulic chuck of the tester can use the surface to provide enough axial force to perform uniaxial tensile test to reduce the probability of eccentric tensile failure. Further, the test piece may be subjected to a sheet bending test as it is. The invention reduces the difficulty of the uniaxial tensile test of the strain hardening cement-based composite material, improves the test efficiency, and provides test guidance for the uniaxial tensile test of other cement-based materials.
Description
Technical Field
The utility model relates to a strain hardening cement base combined material's examination mould specifically is a can pour simultaneously the examination mould of strain hardening cement base combined material unipolar tensile test piece and the crooked test piece of sheet metal, belongs to engineering material application.
Background
The weak tensile properties of traditional concrete have promoted the development of modern concrete design concepts. Since the early 60 s of the last century, researchers have attempted to improve ductility by adding steel fibers, glass fibers, polypropylene fibers, and the like to concrete. The ductility of the early fiber concrete is improved to a certain extent compared with the ordinary concrete because the ductility of the fiber material is not high at that time, but the ductility and the tensile strength are not greatly improved. In Victor C Li of Michigan university, cement, water, a high-performance water reducing agent, Polyvinyl Alcohol Fiber (PVA Fiber for short), ultra-fine quartz sand, fly ash and the like are utilized, and based on micromechanics, a cement-based Composite material with high toughness and tensile strain hardening characteristics is finally obtained, and the cement-based Composite material is called Engineered cementitous Composite and ECC for short. In addition to having ultra-high toughness, such materials are also known as "strain-hardening composites," and are collectively referred to herein as "SHCC.
The most common test method is Uniaxial Tensile Test (UTT) and sheet bending test, the sheet bending test is 400 × 50 × 16mm in size, and the sheet bending test is easy to implement, but the uniaxial tensile test is very difficult to implement.
Disclosure of Invention
The utility model discloses what at first solve is that the problem that strain hardening cement base combined material is difficult to implement in the uniaxial tensile test process provides a sample and operation method that can conveniently implement.
The utility model provides a technical scheme that above-mentioned technical problem adopted is:
a test mold for strain hardening cement-based composite materials comprises a bottom plate, two end templates, a plurality of transverse partition plates, a threaded rod and a locking nut; the end templates and the transverse partition plate are arranged on the bottom plate, and the end templates are positioned at two ends of the bottom plate; a plurality of clamping grooves which are arranged at equal intervals are arranged on the end template; two ends of the transverse partition plates are respectively inserted into the clamping grooves of the two end templates, so that the transverse partition plates are arranged at equal intervals; the end template is provided with bolt holes, and two ends of the threaded rod respectively penetrate through the bolt holes of the two end templates; and the penetrating part is provided with a locking nut for locking the end template.
Preferably, the end head template is symmetrically provided with two bolt holes; the number of the threaded rods is two.
Preferably, the bottom of the end socket template is fastened with the bottom plate through bolt connection.
Preferably, the depth of the two ends of the diaphragm plate inserted into the clamping grooves of the end template is 3-4 mm.
Preferably, the ratio of the length L to the width W of the diaphragm is 25-30; the ratio of the length L to the height H of the diaphragm is 8-10.
Preferably, the ratio of the distance d between the diaphragms to the diaphragm H is 1/4 to 1/6.
Preferably, the number of the transverse partition plates is 5-7.
Preferably, the thickness of the bottom plate is 5-10 mm.
Preferably, the height of the end template is the same as that of the diaphragm plate.
Furthermore, the diaphragm plate and the end template adopted by the test mold are light aluminum alloy with smooth surfaces, and the bottom plate is made of cast iron with higher strength.
The utility model discloses a cross-section examination mould tests, and examination mould is in test piece forming process, and the shrink of the freedom in cross-section can reduce the internal defect of test piece, and it is even to guarantee test piece initial state as far as.
The utility model discloses a mode is pour to the level that examination mould size has changed original examination mould for the shaping of test piece adopts vertical pouring, can guarantee like this that the test piece is at the vibrations in-process, and the test surface of test piece can not come up to the fibre.
The utility model discloses the test piece centre gripping that the examination mould was obtained is on universal tester's hydraulic clamp head, and the frictional force of centre gripping provides sufficient axial load in the testing process, and the test piece can not produce eccentric buckling failure. The test piece was axially broken in a universal testing machine.
The utility model provides a produced test piece of examination mould drawing of patterns also can carry out the sheet metal bending test, and its advantage is in carrying out the crooked experiment of sheet metal when, and test surface is smooth from top to bottom, and the test piece atress is even.
Drawings
Fig. 1 is a schematic view of the entire trial mold.
Fig. 2 is a schematic view of an end stop of the test mold.
Fig. 3 is a schematic view of the bottom plate of the trial mold.
FIG. 4 is a schematic view of the diaphragm of the test mold.
Detailed Description
The invention is further described with reference to the drawings and the detailed description. As shown in fig. 1-4, the test mold for strain hardening cement-based composite material of the present invention comprises a bottom plate 1, two end templates 2, a plurality of transverse partition plates 3, a threaded rod 4 and a locking nut 5; the end head templates 2 and the diaphragm plates 3 are both arranged on the bottom plate 1, and the end head templates 2 are positioned at the two ends of the bottom plate 1; a plurality of clamping grooves which are arranged at equal intervals are arranged on the end head template 2; two ends of the transverse partition plates 3 are respectively inserted into the clamping grooves of the two end templates 2, so that the transverse partition plates 3 are arranged at equal intervals; the end template 2 is provided with bolt holes, and two ends of the threaded rod 4 respectively penetrate through the bolt holes of the two end templates 2; and a locking nut 5 is arranged on the penetrating part and used for locking the end template 2.
In a preferred embodiment of the present invention, the end head template 2 is provided with two bolt holes symmetrically; the number of the threaded rods 4 is two.
In a preferred embodiment of the present invention, the bottom of the end form 2 is fastened to the bottom plate 1 by bolts.
In a preferred embodiment of the present invention, the depth of the two ends of the diaphragm plate 3 inserted into the slots of the end form 2 is 3mm to 4 mm.
In a preferred embodiment of the invention, the ratio of the length L to the width W of the diaphragm 3 is between 25 and 30; the ratio of the length L to the height H of the diaphragm plate 3 is 8-10.
In a preferred embodiment of the present invention, the ratio of the distance d between the diaphragms 3 to the diaphragm 3H is 1/4 to 1/6.
In a preferred embodiment of the present invention, the number of the diaphragms 3 is 5 to 7.
In a preferred embodiment of the present invention, the thickness of the bottom plate 1 is 5-10 mm.
In a preferred embodiment of the invention, the height of the end formwork 2 is the same as the height of the diaphragm 3.
Following is directed at the utility model discloses a strain hardening cement base combined material's examination mould explains its test piece of pouring, drawing of patterns, and the test procedure of test piece.
EXAMPLE 1 cast test piece
Before pouring a test piece according to attached drawings 1-4, the inner surface of the test piece is smeared with mineral oil or other release agents which do not react with a cement-based material by using a paint brush, the smearing is uniform as much as possible, then the test mould is absorbed on a vibrating table with the vibration frequency of 50HZ, the cement-based composite material which is well mixed is loaded into the test mould by using a material shovel at one time, and the test mould is slowly poured along a transverse partition plate, and a steel bar with the diameter smaller than 5mm is inserted and poured along the transverse partition plate. Scraping redundant mixture on the test mold, and trowelling the mixture when the mixture is close to initial setting. After the time of forming, the poured test mold is sealed by a plastic film to prevent water from quickly evaporating, then the test mold is numbered, and the test mold is moved to an environment with the temperature of (20 +/-5) °and stands for (24 +/-1) h.
Example 2 demolding
After standing, respectively loosening the bottom plate bolt and the connecting bolt of the test mold, taking the end mold at the next end, taking the test piece out of the mold, and immediately placing the test piece into a standard curing room with the temperature of (20 +/-2) ° and the relative humidity of more than 95% for curing. In a standard curing room, test pieces are placed on a support and are spaced by 10-20 mm, and the surfaces of the test pieces are kept moist and cannot be directly washed by water.
EXAMPLE 3 uniaxial tensile test was conducted
(1) Requirements of the testing machine
The universal tester should meet the general requirements of GB/T2611 tester, the load measurement precision is +/-1%, and the test piece breaking load should be 20% -80% of the range of the tester sensor.
(2) Test procedure
And taking out the test piece from the curing chamber, wiping the surface of the test piece clean, and measuring the thickness and the width of the deformation zone of the test piece by using a vernier caliper. And then clamping one end of the test piece by using a hydraulic chuck of the universal testing machine. And then adjusting the testing machine to clamp the other end of the test piece by using the hydraulic chuck, loading in a displacement control mode, wherein the displacement control speed is 0.5mm/min, stopping loading when the tensile force borne by the test piece is reduced to 80% of the maximum tensile force, and loosening the hydraulic chuck to take down the test piece.
Example 4 sheet bending test
The test mold is also used for pouring test pieces, and the curing process is shown in embodiment 1 and embodiment 2. The tester requirements are the same as example 3. Mounting the test piece on a testing machine, wherein the mounting size is not more than 1mm, the pressure-bearing surface of the test piece is a smooth non-pouring surface, and the support and the pressure-bearing surface are in full contact; and similarly, displacement control is adopted, the displacement control speed is 0.5mm/min, and the test piece is loaded until the test piece is damaged.
Therefore, the utility model provides a smooth cement base test piece in both sides can be pour to the mould. The test piece can provide enough clamping force by using the testing machine to carry out uniaxial tensile test without generating eccentricity, and can also make the pressure head and the support uniformly contact with the pressure bearing surface to carry out sheet bending test. The success rate of the uniaxial tension test of the cement-based composite material is increased, and the accuracy of the measured data is improved.
Claims (9)
1. A test mold for a strain hardening cement-based composite material is characterized by comprising a bottom plate, two end templates, a plurality of transverse partition plates, a threaded rod and a locking nut;
the end templates and the transverse partition plate are arranged on the bottom plate, and the end templates are positioned at two ends of the bottom plate; a plurality of clamping grooves which are arranged at equal intervals are arranged on the end template; two ends of the transverse partition plates are respectively inserted into the clamping grooves of the two end templates, so that the transverse partition plates are arranged at equal intervals;
the end template is provided with bolt holes, and two ends of the threaded rod respectively penetrate through the bolt holes of the two end templates; and the penetrating part is provided with a locking nut for locking the end template.
2. The trial mold for the strain hardening cement-based composite material according to claim 1, wherein the end head template is provided with two bolt holes in bilateral symmetry; the number of the threaded rods is two.
3. The trial mold for the strain hardening cement-based composite material according to claim 1, wherein the bottom of the end head template is fastened to the bottom plate by bolts.
4. The trial mold for the strain hardening cement-based composite material according to claim 1, wherein the depth of the two ends of the diaphragm plate inserted into the slots of the end template is 3mm to 4 mm.
5. The trial mold for strain hardening cement-based composite material according to claim 1 or 4, wherein the ratio of the length L to the width W of the diaphragm is 25-30; the ratio of the length L to the height H of the diaphragm is 8-10.
6. The trial mold for strain hardening cement-based composite material as claimed in claim 1 or 4, wherein the ratio of the distance d between the diaphragms to the diaphragm H is 1/4-1/6.
7. The trial mold for the strain hardening cement-based composite material according to claim 6, wherein the number of the diaphragms is 5 to 7.
8. The trial mold for the strain hardening cement-based composite material according to claim 6, wherein the thickness of the bottom plate is 5-10 mm.
9. A test form of strain hardening cementitious composite as in claim 6 wherein said head form is of the same height as said bulkhead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920479235.1U CN210880134U (en) | 2019-04-10 | 2019-04-10 | Strain hardening cement-based composite material test mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920479235.1U CN210880134U (en) | 2019-04-10 | 2019-04-10 | Strain hardening cement-based composite material test mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210880134U true CN210880134U (en) | 2020-06-30 |
Family
ID=71311660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920479235.1U Expired - Fee Related CN210880134U (en) | 2019-04-10 | 2019-04-10 | Strain hardening cement-based composite material test mold |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210880134U (en) |
-
2019
- 2019-04-10 CN CN201920479235.1U patent/CN210880134U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200630 |