CN111175114A - Molding test mold and method for chopped fiber-cement-based material test piece - Google Patents
Molding test mold and method for chopped fiber-cement-based material test piece Download PDFInfo
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- CN111175114A CN111175114A CN202010053851.8A CN202010053851A CN111175114A CN 111175114 A CN111175114 A CN 111175114A CN 202010053851 A CN202010053851 A CN 202010053851A CN 111175114 A CN111175114 A CN 111175114A
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- 238000012360 testing method Methods 0.000 title claims abstract description 206
- 239000004568 cement Substances 0.000 title claims abstract description 94
- 239000000463 material Substances 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000000465 moulding Methods 0.000 title claims abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 45
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000007586 pull-out test Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000011518 fibre cement Substances 0.000 claims 1
- 238000010998 test method Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002390 adhesive tape Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920002748 Basalt fiber Polymers 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G01N1/36—Embedding or analogous mounting of samples
-
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
-
- 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
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a molding test die and a molding test method for a chopped fiber-cement-based material test piece, wherein four straight edges of a lower test die and an upper test die in the test die form a rectangular frame body, and the cross sections of the lower test die and the upper test die are the same; the lower test die is fixed on the upper surface of the base; the upper test die is arranged on the lower test die and fixedly connected with the lower test die, and the center of the upper test die frame body is right above the center of the lower test die frame body; the method comprises the following steps of 1, coating a release agent on a lower test mold and a base, pouring a cement-based material into the upper end of the lower test mold, leveling the upper end of the lower test mold; step 2, extending the chopped fibers into the upper surface of the cement-based material, fixing an upper test mold coated with a release agent on the upper surface of a lower test mold, pouring the cement-based material into the upper test mold, leveling the upper end of the upper test mold and then troweling the cement-based material; and 3, removing the upper test mold after molding for 20-24 hours, and taking out the molded chopped fiber-cement-based material test piece. The invention can embody the real interface state, and has simple structure, convenient manufacture and stronger practicability.
Description
Technical Field
The invention belongs to the technical field of road materials, and particularly relates to a forming test mold and a forming method of a chopped fiber-cement-based material test piece.
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.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a forming test mold and a forming test method for a chopped fiber-cement-based material test piece, which have the advantages of simple structure, convenience in operation and high accuracy, and can truly reflect the interface bonding state of chopped fibers and cement-based materials.
The invention is realized by the following technical scheme:
a molding test die for a chopped fiber-cement-based material test piece 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.
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.
A forming method of a chopped fiber-cement-based material test piece is based on any one of the above mentioned forming test molds of the chopped fiber-cement-based material test piece, which comprises the following steps,
and 3, after the cement-based material is molded for 20-24 hours, removing the upper test mold, and taking out the molded chopped fiber-cement-based material test piece.
Further, in step 2, the upper test mold is locked on the upper surface of the lower test mold through the lock catch.
Further, in the step 2, one end of the chopped fiber, which does not extend into the cement-based material, is fixed on the platform through a double faced adhesive tape.
Further, in the step 1, the lower end of the lower test die is inserted into the four grooves, and then a release agent is coated on the lower test die and the base.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the forming test die for the chopped fiber-cement-based material test piece, the lower test die and the base are fixedly arranged, so that cement-based materials can be poured conveniently, the space shape formed by the cross section of the rectangular frame body of the lower test die and the cross section of the rectangular frame body of the upper test die are the same, the cement-based materials with the same shape and bottom area as the cement-based materials can be formed again, when the cement-based materials are formed for the second time, the chopped fibers can be fixed through the lower test die and the upper test die, the chopped fibers are kept still when the cement-based materials are formed for the second time, and therefore the chopped fiber cement-based material test piece can be obtained, and therefore the. 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.
The invention relates to a method for forming a chopped fiber-cement-based material test piece, which comprises the steps of firstly coating a release agent on the inner wall of a lower test mould and the part of the upper surface of a base, which is surrounded by the lower test mould, so that the test piece can be smoothly demoulded after being formed, then placing chopped fibers according to the requirements of a chopped fiber pull-out test after a cement-based material is compacted and leveled, and then pouring a cement-based material into the test piece for compaction forming, so that the bonding effect of the chopped fibers and the cement-based material is not influenced, the interface bonding state of the chopped fibers and the cement-based material can be truly reflected, the influence of human factors in the prior art is overcome, and the blank.
Furthermore, the end, which does not extend into the cement-based material, of the chopped fiber is fixed on the platform through the double faced adhesive tape, and the distance between the chopped fibers can be conveniently and accurately adjusted by using the scale marks.
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 a trial of the present invention.
Fig. 4 is a cross-sectional view of the base of fig. 1 in accordance with the present invention.
Fig. 5 is a top view of the base of fig. 1 in accordance with the present invention.
FIG. 6 is a diagram illustrating an example of a molded test piece according to the present invention.
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 and scale marks 8.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1, 2 and 3, the forming test mold for the chopped fiber-cement-based material test piece of the present invention 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.
The invention relates to a method for forming a chopped fiber-cement-based material test piece, which comprises the following steps,
and 3, forming the cement-based material for 20-24 h, then demoulding, unlocking the lock catch 4, removing the upper test mould 5 and the lower test mould 2, removing the double-sided adhesive, and taking out the formed chopped fiber-cement-based material test piece.
FIG. 6 is a diagram of a concrete sample of a chopped fiber cement-based material specimen, wherein selected chopped fibers are basalt fibers, the length is 6-18 mm, the diameter is 13-21 μm, and the mass ratio of cement to sand in the cement-based material specimen 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 upper surfaces of the platform 3 and the base 1 can be 1/4-3/4 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 the fiber is 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 chopped fiber-cement-based material is calculated, so that the interface bonding performance of the chopped fiber-cement-based material is represented, and 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-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. A molding test die for a chopped fiber-cement-based material test piece 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. A test mould for forming a test piece of chopped fibre-cement based material according to claim 1, characterized in that the upper test mould (5) and the lower test mould (2) are provided with lock catches (4).
3. The forming test mould for the chopped fiber-cement-based material test piece according to claim 2, wherein the lock catches (4) are arranged in the length direction of the upper test mould (5) and the lower test mould (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 mould (2) in the length direction and between the lock catches (4) and two ends of the upper test mould (5) in the length direction, and the lock catches (4) are symmetrically distributed on a horizontal plane.
4. A test mould for forming a test piece of chopped fiber-cement based material according to claim 3, further comprising platforms (3) horizontally fixed on both sides of the upper end of the lower test mould (2), wherein the platforms (3) comprise rectangular plates, the length of the platforms (3) is smaller than that of the lower test mould (2), the platforms (3) are symmetrically distributed on the horizontal plane, and the platforms (3) are arranged between the lock catches (4).
5. A test mould for forming test pieces of chopped strand cement-based material according to claim 4, characterised in that the platform (3) is provided with graduations (8).
6. The forming test mould for the chopped fiber-cement-based material test piece according to claim 1, wherein 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 mould (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 mould (2) is inserted into the four grooves (7).
7. A forming method of a chopped fiber-cement based material test piece is characterized in that the forming test mold based on the chopped fiber-cement based material test piece of any one of claims 1 to 6 comprises the following steps,
step 1, firstly, coating a release agent on the inner wall of a lower test mold (2) and the part of the upper surface of a base (1) surrounded by the lower test mold (2), then pouring the uniformly stirred cement-based material into the lower test mold (2) and enabling the cement-based material to be flush with the upper end of the lower test mold (2), and then compacting and leveling the cement-based material;
step 2, firstly, according to the requirements of a chopped fiber pull-out test, one end of a chopped fiber (6) is stretched into the upper surface of a cement-based material, then an upper test mold (5) with the inner wall coated with a release agent is fixed on the upper surface of a lower test mold (2), then the uniformly stirred cement-based material is poured into the upper test mold (5) and is parallel to the upper end of the upper test mold (5), and then the cement-based material is compacted and then is leveled;
and 3, after the cement-based material is molded for 20-24 hours, removing the upper test mold (5), and taking out the molded chopped fiber-cement-based material test piece.
8. A method for forming a chopped strand cement-based material test piece according to claim 7, wherein in step 2, the upper test mold (5) is locked on the upper surface of the lower test mold (2) through the lock catch (4).
9. A method for forming a chopped strand cement-based material test piece according to claim 7, wherein in step 2, the end of the chopped strand (6) not extending into the cement-based material is fixed on the platform (3) by double-sided adhesive.
10. The forming method of the chopped fiber-cement-based material test piece according to claim 7, wherein in the step 1, the lower end of the lower test mold (2) is inserted into the four grooves (7), and then the lower test mold (2) and the base (1) are coated with a release agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053851.8A CN111175114A (en) | 2020-01-17 | 2020-01-17 | Molding test mold and method for chopped fiber-cement-based material test piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053851.8A CN111175114A (en) | 2020-01-17 | 2020-01-17 | Molding test mold and method for chopped fiber-cement-based material test piece |
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| CN111175114A true CN111175114A (en) | 2020-05-19 |
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| CN202010053851.8A Pending CN111175114A (en) | 2020-01-17 | 2020-01-17 | Molding test mold and method for chopped fiber-cement-based material test piece |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655462A (en) * | 2015-02-05 | 2015-05-27 | 李贺东 | Sample forming die for straight type chopped fiber pull-out test and manufacturing method of sample forming die |
| CN109822724A (en) * | 2019-02-26 | 2019-05-31 | 东南大学 | Variable thickness single fiber pull-out cement base test piece mould and adjusting and test method |
| CN109822725A (en) * | 2019-03-11 | 2019-05-31 | 安徽理工大学 | A kind of mold and method for cement-soil with fiber test block production |
| 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 |
| CN211602710U (en) * | 2020-01-15 | 2020-09-29 | 广东省路桥建设发展有限公司 | Short fibre pulls out shaping examination mould of experimental test piece of using |
-
2020
- 2020-01-17 CN CN202010053851.8A patent/CN111175114A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN104655462A (en) * | 2015-02-05 | 2015-05-27 | 李贺东 | Sample forming die for straight type chopped fiber pull-out test and manufacturing method of sample forming die |
| CN109822724A (en) * | 2019-02-26 | 2019-05-31 | 东南大学 | Variable thickness single fiber pull-out cement base test piece mould and adjusting and test method |
| CN109822725A (en) * | 2019-03-11 | 2019-05-31 | 安徽理工大学 | A kind of mold and method for cement-soil with fiber test block production |
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| Title |
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| 王晓伟等: "钢纤维与混凝土粘结强度试验方法研究", 《河北工业大学成人教育学院学报》 * |
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Application publication date: 20200519 |