CN211602710U - Short fibre pulls out shaping examination mould of experimental test piece of using - Google Patents
Short fibre pulls out shaping examination mould of experimental test piece of using Download PDFInfo
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- CN211602710U CN211602710U CN202020085781.XU CN202020085781U CN211602710U CN 211602710 U CN211602710 U CN 211602710U CN 202020085781 U CN202020085781 U CN 202020085781U CN 211602710 U CN211602710 U CN 211602710U
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Abstract
The utility model provides a molding test die of a test piece for chopped fiber extraction test, which comprises a base, a lower test die and an upper test die; the lower test die and the upper test die respectively comprise four straight sides, the four straight sides of the lower test die and the four straight sides of the upper test die form a rectangular frame body, and the cross sections of the frame bodies of the lower test die and the upper test die form the same space shape; the lower test die is fixedly arranged on the upper surface of the base; the lower surface of the upper test mold is arranged on the upper surface of the lower test mold, the upper test mold is fixedly connected with the lower test mold, and the center of the upper test mold frame is right above the center of the lower test mold frame. The cement-based material has a typical layered structure, the test mold fills the blank of accurate preparation of the bonding strength test piece, overcomes the influence of human factors and the layered structure of the cement-based material in the prior art, can reflect a real interface state, and has the advantages of simple structure, convenience in manufacturing, lower cost and higher practicability.
Description
Technical Field
The utility model belongs to the technical field of road material, specifically be a chopped strand extracts shaping examination mould of experimental test piece of using.
Background
In the forming process of the pavement concrete, shrinkage cracks can occur due to factors such as environmental change or unreasonable material design and construction, and the early cracks are further expanded under the coupling action of later load and environment, so that the durability of the pavement concrete is reduced. The doped fiber has been used as an important means for the research of the anti-cracking, toughening and modifying of the concrete in engineering, which has reached a consensus in the engineering world at home and abroad. At present, the fiber for modified cement concrete mainly adopts various types such as basalt fiber, steel fiber, glass fiber, carbon fiber and the like. The chopped fibers are used in the cement-based material, and can generate synergistic deformation with the cement-based material under the action of load and environment, so that the anti-cracking and toughening effects of the chopped fibers are fully exerted, and the generation of cracks of the cement-based material is greatly slowed down.
The good interface bonding strength of the chopped fibers and the cement-based material is the basis for the crack resistance of the chopped fibers and the cement-based material, and the test of the interface strength of the chopped fibers and the cement-based material from a microscopic scale is the key research point. The currently adopted test methods for the interface bonding strength of the composite material comprise a fiber pull-out test, a fiber section crack test, a fiber press-in test, a microbead test and the like, wherein the fiber pull-out test is simple in principle and most popular and effective. However, the current bonding strength test is that a cement-based test piece is formed firstly, and then the chopped fibers are manually inserted into the test piece, so that the mode is greatly influenced by human factors, the integrity of the test piece is damaged, and the interface state of the test piece and the chopped fibers cannot be truly reflected.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides a chopped strand extracts shaping examination mould of experimental test piece, simple structure, convenient operation, the degree of accuracy height can truly reflect chopped strand and cement-based material's interface bonding state.
The utility model discloses a realize through following technical scheme:
a molding test die of a test piece for a chopped fiber pull-out test comprises a base, a lower test die and an upper test die;
the lower test die and the upper test die respectively comprise four straight sides, the four straight sides of the lower test die and the four straight sides of the upper test die form a rectangular frame body, and the cross sections of the frame bodies of the lower test die and the upper test die form the same space shape; the lower test die is fixedly arranged on the upper surface of the base;
the lower surface of the upper test mold is arranged on the upper surface of the lower test mold, the upper test mold is fixedly connected with the lower test mold, and the center of the upper test mold frame is right above the center of the lower test mold frame.
Preferably, the upper test die and the lower test die are provided with a lock catch.
Further, the hasp setting on the length direction of trying mould and lower examination mould on, length direction on arranged two hasps, the hasp leaves the interval with the both ends of trying mould length direction and the both ends of trying the mould length direction on the hasp under and, hasp symmetric distribution on the horizontal plane.
Further, still including the level fixed platform in examination mould upper end both sides under, the platform includes a rectangular plate, and the length of platform is less than the length of examination mould under, and the platform is in horizontal plane symmetric distribution, and the platform is arranged between the hasp.
Furthermore, the platform is provided with scale marks.
And furthermore, the height of the platform from the upper surface of the base is 1/4-3/4 of the height of the upper end of the upper test die from the upper surface of the base.
Preferably, the upper surface of base is provided with four recesses the same with lower examination mould framework thickness, and the degree of depth of four recesses is the same, and four recesses are linked together end to end and form the rectangle structure, and the lower extreme of lower examination mould is pegged graft in four recesses.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model relates to a chopped strand extracts shaping examination mould of experimental test piece of using, lower examination mould sets up with the base is fixed, can conveniently pour cement-based material earlier like this, the space shape that lower examination mould and last examination mould rectangle framework cross section formed is the same, can the remolding with the same cement-based material of preceding shape bottom surface area, and when the secondary molding cement-based material, can fix chopped strand through examination mould and last examination mould down, the chopped strand keeps motionless when making the secondary molding cement-based material, like this alright obtain chopped strand cement-based material test piece, like this alright develop chopped strand smoothly and extract the experiment. The cement-based material has a typical layered structure, the test mold fills the blank of accurate preparation of the bonding strength test piece, overcomes the influence of human factors and the layered structure of the cement-based material in the prior art, can reflect a real interface state, and has the advantages of simple structure, convenience in manufacturing, lower cost and higher practicability.
Furthermore, the interface bonding strength of the chopped fibers and the cement-based material is greatly influenced by the distance between the chopped fibers, and the scale marks arranged on the platform can conveniently and accurately control the distance between the chopped fibers.
Furthermore, the lower end of the lower test die is inserted into the four grooves, so that the demolding of the test piece is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of the test mold of the present invention.
Fig. 2 is a front view of the trial mold of the present invention.
Fig. 3 is a top view of the test mold of the present invention.
Fig. 4 is a cross-sectional view of the base of fig. 1 according to the present invention.
Fig. 5 is a top view of the base of fig. 1 according to the present invention.
Figure 6 is the utility model discloses a structural schematic of shaping test piece.
Wherein: the test device comprises a base 1, a lower test die 2, a platform 3, a lock catch 4, an upper test die 5, chopped fibers 6, a groove 7, scale marks 8 and a cement-based material 9.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
As shown in fig. 1, 2 and 3, the utility model relates to a test piece forming test mold for chopped fiber extraction test, which comprises a base 1, a lower test mold 2 and an upper test mold 5;
the lower test die 2 and the upper test die 5 both comprise four straight sides, the four straight sides of the lower test die 2 and the upper test die 5 form a rectangular frame, and the cross sections of the frame of the lower test die 2 and the frame of the upper test die 5 form the same space shape; the lower test die 2 is fixedly arranged on the upper surface of the base 1; the lower surface of the upper test mold 5 is arranged on the upper surface of the lower test mold 2, the upper test mold 5 is fixedly connected with the lower test mold 2, and the center of the frame body of the upper test mold 5 is right above the center of the frame body of the lower test mold 2.
Specifically, the upper test die 5 and the lower test die 2 are provided with the lock catches 4, the lock catches 4 are arranged in the length direction of the upper test die 5 and the lower test die 2, two lock catches 4 are arranged in the length direction, a distance is reserved between the lock catches 4 and two ends of the lower test die 2 in the length direction and between the lock catches 4 and two ends of the upper test die 5 in the length direction, and the lock catches 4 are symmetrically distributed on a horizontal plane; the upper test die 5 and the lower test die 2 are connected through the lock catch 4.
In the preferred scheme, still include the platform 3 of horizontal fixation in the lower test 2 upper end both sides, platform 3 includes a rectangular plate, the length of platform 3 is less than the length of lower test 2, platform 3 is in horizontal plane symmetric distribution, platform 3 arranges between hasp 4, the interface bonding strength of chopped strand and cement-based material is influenced by chopped strand interval and chopped strand embedding length greatly, platform 3 is carved with scale mark 8 for accurate control chopped strand's interval, fig. 1 avoids the error that scale mark 8 shows, so do not draw.
In order to facilitate demolding, referring to fig. 4 and 5, the upper surface of the base 1 is provided with four grooves 7 with the same thickness as the frame body of the lower test mold 2, the depths of the four grooves 7 are the same, the four grooves 7 are communicated end to form a rectangular structure, and the lower end of the lower test mold 2 is inserted into the four grooves 7, that is, the lower test mold 2 is embedded into the four grooves 7 on the base.
When the molding test mold of the test piece for the chopped fiber pull-out test is used, the method comprises the following steps,
and 3, forming the cement-based material for 20-24 hours, then demoulding, unlocking the lock catch 4, removing the upper test mould 5 and the lower test mould 2, removing the double-faced adhesive tape, and taking out the formed chopped fiber cement-based material test piece.
Fig. 6 is a schematic structural diagram of a specific chopped fiber cement-based material test piece, wherein the selected chopped fibers 6 are basalt fibers, the length is 6-18 mm, the diameter is 13-21 μm, the chopped fibers 6 are deflected in different degrees, and in the cement-based material 9, the mass ratio of cement to sand is 1: 3, the water-cement ratio is 0.5.
The internal sizes of the used test dies, namely the lower test die 2 and the upper test die 5 are 100mm multiplied by 20mm multiplied by 10mm, and the width of the platform 3 is 1 cm.
Considering the layering condition, the size of the test piece is kept unchanged at 100mm multiplied by 20mm, and the positions of the platform 3 and the upper surface of the base 1 can be 1/4-3/4 mm of the test piece, namely 5-15 mm.
And (3) after demolding, putting the test piece into a water tank for maintenance, and performing a tensile test on the standard-maintained 28d chopped fiber cement-based material test piece on a universal testing machine until fibers are pulled out to obtain a load/displacement curve. According to the assumption of uniform distribution of interface load and uniform isotropy of materials, a load/displacement curve is brought into an interface load transfer model, and the interface shear strength of the fiber-cement-based material is calculated so as to represent the interface bonding performance of the fiber-cement-based material, wherein the larger the interface shear strength is, the better the bonding performance of the chopped fiber and the cement-based material is. The type, diameter and embedding length range of the chopped fiber which is well adapted to the cement-based material are preferably selected according to the advantages and disadvantages of the bonding strength of the chopped fiber and the cement-based material.
The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.
Claims (7)
1. A molding test die of a test piece for a chopped fiber pull-out test is characterized by comprising a base (1), a lower test die (2) and an upper test die (5);
the lower test die (2) and the upper test die (5) both comprise four straight sides, the four straight sides of the lower test die (2) and the four straight sides of the upper test die (5) form a rectangular frame, and the cross sections of the frame of the lower test die (2) and the frame of the upper test die (5) form the same space shape; the lower test die (2) is fixedly arranged on the upper surface of the base (1);
the lower surface of the upper test die (5) is arranged on the upper surface of the lower test die (2), the upper test die (5) is fixedly connected with the lower test die (2), and the center of the frame body of the upper test die (5) is right above the center of the frame body of the lower test die (2).
2. The test piece forming die for chopped fiber extraction tests as claimed in claim 1, wherein the upper test die (5) and the lower test die (2) are provided with the lock catches (4).
3. The short-cut fiber extraction test piece forming test die as claimed in claim 2, wherein the latches (4) are arranged in the length direction of the upper test die (5) and the lower test die (2), two latches (4) are arranged in the length direction, a distance is reserved between each latch (4) and the two ends of the lower test die (2) in the length direction and between each latch (4) and the two ends of the upper test die (5) in the length direction, and the latches (4) are symmetrically distributed on a horizontal plane.
4. The chopped fiber drawing test piece forming test mold according to claim 3, further comprising platforms (3) horizontally fixed on two sides of the upper end of the lower test mold (2), wherein the platforms (3) comprise rectangular plates, the length of the platforms (3) is smaller than that of the lower test mold (2), the platforms (3) are symmetrically distributed on the horizontal plane, and the platforms (3) are arranged between the lock catches (4).
5. The molding test die for a test piece for chopped strand extraction tests according to claim 4, wherein the platform (3) is provided with scale marks (8).
6. The test piece forming die for chopped fiber extraction tests according to claim 4, wherein the height of the platform (3) from the upper surface of the base (1) is 1/4-3/4 of the height of the upper end of the upper test die (5) from the upper surface of the base (1).
7. The forming test die of the test piece for the chopped fiber extraction test according to claim 1, wherein four grooves (7) with the same thickness as the frame body of the lower test die (2) are arranged on the upper surface of the base (1), the depths of the four grooves (7) are the same, the four grooves (7) are communicated end to form a rectangular structure, and the lower end of the lower test die (2) is inserted into the four grooves (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020085781.XU CN211602710U (en) | 2020-01-15 | 2020-01-15 | Short fibre pulls out shaping examination mould of experimental test piece of using |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020085781.XU CN211602710U (en) | 2020-01-15 | 2020-01-15 | Short fibre pulls out shaping examination mould of experimental test piece of using |
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| CN211602710U true CN211602710U (en) | 2020-09-29 |
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| CN202020085781.XU Expired - Fee Related CN211602710U (en) | 2020-01-15 | 2020-01-15 | Short fibre pulls out shaping examination mould of experimental test piece of using |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2020
- 2020-01-15 CN CN202020085781.XU patent/CN211602710U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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: 20200929 Termination date: 20220115 |