CN109822724B - Variable-thickness single fiber drawn cement-based test piece mold and adjusting and testing method - Google Patents
Variable-thickness single fiber drawn cement-based test piece mold and adjusting and testing method Download PDFInfo
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- CN109822724B CN109822724B CN201910141654.9A CN201910141654A CN109822724B CN 109822724 B CN109822724 B CN 109822724B CN 201910141654 A CN201910141654 A CN 201910141654A CN 109822724 B CN109822724 B CN 109822724B
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Abstract
The invention provides a variable-thickness single fiber pulled cement-based test piece mold and an adjusting and testing method. The die comprises a bottom plate, a frame, upright posts, side wing upper and lower modules and a partition plate, wherein all the parts are connected through screw bolts and the like. The method for adjusting the thickness of the test piece based on the die is provided, and the single fiber drawn cement-based test piece with the specified thickness can be obtained on the premise of not cutting the test piece. The invention can pour a plurality of single fibers at one time to pull out the cement-based test piece, has simple structure, strong operability and easy demoulding, and the separation plates are arranged between the test pieces to be independently formed, and the thickness of the poured test piece can be adjusted by adjusting the position of the side wing module, thereby saving the cutting process in the traditional method and avoiding the risk of fiber/matrix interface damage caused by cutting.
Description
Technical Field
The invention relates to the field of testing of fiber reinforced cement-based materials, in particular to a variable-thickness single-fiber pulled cement-based test piece mold and an adjusting and testing method.
Background
High-toughness fiber-reinforced cement-based composite (ECC) is a novel material with ultrahigh ductility, impact resistance, durability, anti-cracking performance and strain hardening performance, and overcomes the defects of low tensile strength, low deformability, high brittleness, poor impact resistance and the like of the traditional cement-based material. The mechanical property of the composite material mainly depends on the section bonding property of the fibers in the composite material and a cement matrix, and the parameter of the property is mainly obtained through a single fiber extraction experiment. A
The pouring of the test piece at home and abroad adopts fixed thickness pouring, and then the test piece is cut to the specified thickness. But the fiber and the matrix cross section are inevitably damaged in the cutting process, and the experimental result is influenced. The mould and the thickness adjusting method provided by the invention can directly pour the single fiber with the specified thickness to pull out the cement-based test piece on the premise of not damaging the test piece, thereby measuring the accurate interface bonding performance parameters.
Disclosure of Invention
In order to solve the problems, the invention provides a variable-thickness single-fiber pulled cement-based test piece mold and an adjusting and testing method, which can obtain a single-fiber pulled cement-based test piece with a specified thickness on the premise of not losing the test piece. The invention can pour a plurality of single fiber extraction cement-based test pieces at one time, has simple structure, strong operability and easy demoulding, and each test piece is separated by the separation plate and independently formed, and the thickness of the poured test piece can be adjusted by adjusting the position of the flank module, thereby saving the cutting process in the traditional method, avoiding the risk of damaging the fiber/matrix interface due to cutting, and achieving the purpose, the invention provides a novel variable-thickness single fiber extraction cement-based test piece mould which comprises a bottom plate, a frame, upright columns, flank lower modules, flank upper modules and the separation plates, wherein four corners of the bottom plate are connected with the frame through four screws, the bottom plate and the two upright columns are respectively connected through two screws, two sides of the two flank lower modules are connected through corresponding upright columns through screws, the flank upper modules are connected with the corresponding flank lower modules through screws, the fibers are arranged between the side wing upper module and the side wing lower module, and the separation plates are inserted into the grooves of the side wing lower module and the side wing upper module.
In a further limitation of the structure of the present invention, the number of the partition plates is 3 to 5.
A further limitation of the structure of the invention is that the thickness of the frame is equal to the thickness of the modules under the flanks.
The thickness adjusting method for pulling out the cement-based test piece mould by the single fiber with variable thickness comprises the following steps:
the pouring process comprises the following steps:
1) determining the position of the fiber on the frame, sticking the fiber, fixing the upright post on the bottom plate, and threading the screw;
2) sliding the lower side wing modules along the screw rods, fixing two sides of the lower side wing modules by nuts, measuring the distance between the lower side wing modules on the two sides, and determining the thickness of a test piece, wherein the upright posts and the lower side wing modules are fixed at the moment;
3) coating oil on the middle position of the bottom plate, the side surface of the lower module of the side wing, the side surface of the upper module of the side wing and the side surface of the partition plate to prepare cement-based slurry;
4) inserting the partition plate, forming a single-side open slot between the two lateral wing lower modules, pouring a substrate into the slot, and vibrating by using a tool due to small space;
5) putting the frame adhered with the fibers from the top, and connecting and completely fixing the frame with the bottom plate, wherein the fibers just fall in the middle of the pouring position of each test piece, and the fibers are embedded into a partially protruded matrix as much as possible;
6) the upper module 5 of the flank is stacked on the lower module 4 of the flank and is completely fixed, the groove which is originally poured into the matrix is expanded upwards, new matrix is poured into the groove, the two sides of the groove are vibrated by a tool, fibers cannot be touched, the mould is slightly vibrated to compact the matrix, the top of the matrix is flush with the upper module of the flank, the top of the matrix is in contact with the air, and the pouring of the test piece is finished;
the mould removal process comprises the following steps:
1) the partition plate 6 is pulled out, and the adhered part of the fiber 7 is taken down from the frame 2;
2) removing the connecting screws of the upper flank module 5 and the lower flank module 4, and detaching the upper flank module 5;
3) the locking of the lower flank module 4 on the screw is released, and the lower flank module 4 is slowly and integrally pushed out, namely the lower flank module 4 is removed;
4) a rectangular test piece with the fiber 7 inserted in the center is obtained.
In a further limitation of the method of adjusting of the present invention, the vibrating tool is a needle.
The invention relates to a test method for pulling out a cement-based test piece mold from a single fiber with variable thickness, wherein the test piece comprises the fiber and a poured cement block, and the test steps are as follows:
1) the poured cement block of the test piece is hooked by an upper opening slot of the T-shaped fixing slot, and the lower edge of the fiber of the test piece is stuck on the paper and is clamped and fixed by a pneumatic chuck of the test instrument;
2) using displacement loading, the fiber was slowly tightened to force and then the test was run at a rate of 0.1 mm per minute until the fiber pulled out or broke and the test was complete.
The invention provides a novel variable-thickness single-fiber pulled-out cement-based test piece die which comprises a bottom plate, a frame, stand columns, side wing upper and lower modules and a partition plate. The upright column is a metal block with two fixing holes and a screw rod hole, penetrates through the screw rod and is used for fixing the module under the flank, and the upright column is a positioning device of the flank module. The frame is a common rectangular frame, but requires fibers to be pre-glued to designated locations for securing the fibers. The division board inserts in the groove that the flank module of both sides formed at one of them stage of pouring for separate each test piece, this mould can be designed for once only pouring a plurality of test pieces, only need design corresponding quantity the groove and the spacer can. The lower module of the side wing can slide on a screw rod connected with the upright post, and then the position of the lower module of the side wing is fixed by a nut, so that the thickness of a pouring test piece is controlled.
The beneficial effects are as follows:
1. a plurality of single fibers can be poured at one time to pull out the cement-based test piece, the structure is simple, the operability is strong, and the demolding is easy.
2. The partition plates are arranged between the test pieces and are independently formed, and the thickness of the pouring test piece can be adjusted by adjusting the position of the side wing module, so that the cutting process in the traditional method is omitted, and the risk of fiber/matrix interface damage caused by cutting is avoided.
Drawings
FIG. 1 is a schematic view of the mold of the present invention prior to assembly;
FIG. 2 is a schematic view of the mold of the present invention after assembly;
FIG. 3 is a schematic view of a test piece of the present invention;
FIG. 4 is a schematic illustration of the testing process of the present invention;
in the figure: 1. a base plate; 2. a frame; 3. a column; 4. a flank lower module; 5. a module on the side wing; 6. a partition plate; 7. fibers; 8. pouring a cement block; 9. t-shaped fixing grooves; 10. cardboard; 11. a pneumatic chuck.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
the invention provides a variable-thickness single-fiber pulled-out cement-based test piece die and an adjusting and testing method, which can obtain a single-fiber pulled-out cement-based test piece with a specified thickness on the premise of not losing the test piece. The invention can pour a plurality of single fibers at one time to pull out the cement-based test piece, has simple structure, strong operability and easy demoulding, and the separation plates are arranged between the test pieces to be independently formed, and the thickness of the poured test piece can be adjusted by adjusting the position of the side wing module, thereby saving the cutting process in the traditional method and avoiding the risk of fiber/matrix interface damage caused by cutting.
Fig. 1 and 2 illustrate the mold before and after assembly, respectively. The invention is further described below with reference to the accompanying drawings.
As shown in the attached figure 1, the novel single-fiber extraction test piece mold and the novel variable-thickness single-fiber extraction cement-based test piece mold comprise a bottom plate 1, a framework 2 for laying fibers, a stand column 3 fixed on the bottom plate, a flank lower module 4, a flank upper module 5 and a partition plate 6.
Wherein: two side wing lower modules 4 and two side wing upper modules 5 are arranged respectively; five partition plates 6; the bottom plate 1 is connected with the frame 2 through four screws; the bottom plate 1 is connected with the two upright posts through two screws respectively; the side wing lower module 4 is connected with the upright post 3 through a screw; the flank upper module 5 and the flank lower module 4 are connected through screws; the partition plate 6 is fixed to the lower flank module 4 and the upper flank module 5 by insertion without bolts.
The side wing lower module 4 and the side wing upper module 5 are both cut into two kinds of groove positions, the first groove position is used for conveniently connecting the side wing lower module 4 and the side wing upper module 5 with the upright post 3, namely, a vacant position is reserved for the upright post 3. The second groove position is specially used for inserting the partition plate 6 to divide each test piece pouring position.
The flank lower module 4 and the flank upper module 5 are connected through screws but not connected with the bottom plate, so that the purpose of moving in the screw rod direction is achieved, and the thickness of a test piece is conveniently adjusted.
Each upright 3 is connected with the bottom plate through two screws and is completely fixed. The middle of the upright post is penetrated by a screw, the lower module 4 of the side wing is connected with the bolt, and the position is fixed and determined by nuts at two ends, so that the thickness of the pouring test piece is adjusted (adjustable between 0mm and 20 mm).
The thickness of the frame 2 is equal to the thickness of the lower module 4 of the side wing, so that the laying fiber can directly pass through the gap between the upper module and the lower module of the side wing.
The invention relates to a thickness adjusting method of a novel variable-thickness single-fiber pulled cement-based test piece mold, which comprises a pouring process and a mold stripping process;
the pouring process comprises the following steps:
1, determining the position of the fiber on the frame, and sticking the fiber. The upright post is fixed on the bottom plate, and the screw rod is threaded.
And 2, sliding the lateral wing lower modules in along the screw rod, fixing two sides of the lateral wing lower modules by using nuts, and measuring the distance between the lateral wing lower modules at the two sides, namely determining the thickness of the test piece. The uprights and the under-wing modules are now fixed.
And 3, coating the middle position of the bottom plate, the side surfaces of the lower module of the side wing and the upper module of the side wing and the side surfaces of the spacers. A cement-based slurry is prepared.
4, a partition plate is inserted, and a single-side open slot is formed between the two side wing lower modules. The matrix is poured into the groove and vibrated by a fine needle due to the small space.
5, putting the frame adhered with the fibers from the top, and connecting and completely fixing the frame with the bottom plate. The fibers are just in the middle of the pouring position of each test piece, and the fibers are embedded into the partially protruded matrix as much as possible.
And 6, the upper module of the side wing is stacked on the lower module of the side wing and is completely fixed. At this time, the groove in which the matrix is originally poured is expanded upwards, new matrix is poured, and the two sides of the matrix are vibrated by small tools, so that the fibers cannot be touched. The mold was gently shaken to densify the matrix. The top of the substrate is flush with the module on the flank, and the top is in contact with the air. At this time, the mold is as shown in fig. 2, and the test piece is completely poured and can be maintained.
The mold stripping process comprises the following steps:
1 pulling out the partition plate and removing the adhered part of the fiber from the frame.
And 2, removing the connecting screws of the module on the side wing and the module under the side wing, and detaching the module on the side wing.
And 3, releasing the locking of the lower module of the side wing on the screw rod, slowly pushing the lower module of the side wing integrally, namely detaching the lower module of the side wing.
4 obtaining a rectangular test piece with the fiber inserted in the center.
The invention relates to a test method for pulling out a cement-based test piece mold from a single fiber with variable thickness, wherein the test piece comprises the fiber and a poured cement block, and the test steps are as follows:
1) the concrete block poured on the test piece is hooked by an upper opening groove of a T-shaped fixing groove, the lower edge of the fiber of the test piece is stuck on paper and is clamped and fixed by a pneumatic chuck of a test instrument, in order to fix the pulled-out test piece, the applicant designs a special T-shaped fixing groove, the lower edge of the special T-shaped fixing groove is clamped and fixed by the pneumatic chuck of the test instrument, and the upper opening groove is used for hooking the cement matrix part of the pulled-out test piece. Compare in traditional direct clamp cement base member way or glue the cement base member, can avoid stress concentration and glue to the influence of fibre afterbody like this, the installation is also very swift simultaneously, and the fibre part on test piece upper portion uses 502 glue to bond on hard board to press from both sides tight hard board with pneumatic joint, can guarantee like this that the fibre can not take place relative slip.
2) Using displacement loading, the fiber was slowly tightened to force and then the test was run at a rate of 0.1 mm per minute until the fiber pulled out or broke and the test was complete.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (6)
1. Variable thickness single fiber extracts cement base test piece mould, module (5) and division board (6) on bottom plate (1), frame (2), stand (3), flank under module (4), the flank, its characterized in that: four angles of bottom plate (1) are through four screwed connection with frame (2), bottom plate (1) and two stands are respectively through two screwed connection, and module (4) both sides pass through corresponding stand (3) through the screw rod under two flanks and are connected, module (5) link to each other through the screw on module (4) under the flank with module (4) under the corresponding flank on the flank, between module (4) under module (5) and the flank on fibre (7) on the flank, division board (6) cartridge is in the slot of module (5) on module (4) and the flank under the flank.
2. The variable thickness single fiber pulling cement-based test piece mold of claim 1, wherein: 3-5 separating plates (6) are arranged.
3. The variable thickness single fiber pulling cement-based test piece mold of claim 1, wherein: the thickness of the frame (2) is equal to that of the lower module (4) of the side wing.
4. The method for adjusting the thickness of the single fiber drawn cement-based test piece mold with the variable thickness according to any one of claims 1 to 3, comprising a pouring process and a form removal process, and is characterized in that:
the pouring process comprises the following steps:
1) determining the position of the fiber (7) on the frame (2), sticking the fiber (7), fixing the upright post (3) on the bottom plate (1), and threading a screw;
2) sliding the lateral wing lower modules (4) along the screw rods, fixing the two sides of the lateral wing lower modules by nuts, measuring the distance between the lateral wing lower modules (4) on the two sides, determining the thickness of the test piece, and fixing the upright posts (3) and the lateral wing lower modules (4);
3) coating oil on the middle position of the bottom plate (1), the side surface of the flank lower module (4), the side surface of the flank upper module (5) and the side surface of the partition plate (6) to prepare cement-based slurry;
4) a partition plate (6) is inserted, a single-side open slot is formed between the two lateral wing lower modules (4), a substrate is poured into the slot, and vibration is carried out by a tool;
5) putting the frame (2) adhered with the fibers (7) from the top, connecting the frame with the bottom plate (1) and completely fixing the frame, wherein the fibers (7) just fall in the middle of the pouring position of each test piece, and embedding the fibers (7) into a partially protruded matrix;
6) the upper module (5) of the side wing is stacked on the lower module (4) of the side wing and is completely fixed, the groove which is originally poured into the matrix is expanded upwards, new matrix is poured into the groove, the two sides of the groove are vibrated by tools without touching the fiber, the mold is vibrated to compact the matrix, the top of the matrix is level to the upper module of the side wing, the top of the matrix is in contact with the air, and the pouring of the test piece is completed;
the mould removal process comprises the following steps:
1) the partition plate (6) is pulled out, and the pasting part of the fiber (7) is taken down from the frame (2);
2) removing the connecting screws of the upper flank module (5) and the lower flank module (4), and detaching the upper flank module (5);
3) the locking of the flank lower module (4) on the screw is released, and the flank lower module (4) is wholly pushed out, namely the flank lower module (4) is removed;
4) rectangular test pieces with fibers (7) inserted in the center are obtained.
5. The method of adjusting the thickness of a variable thickness single fiber pulling cement-based test piece mold of claim 4, wherein the vibrating tool is a pin.
6. Method for testing a variable thickness single fiber extraction cement-based test piece according to any of claims 1-3, said test piece comprising fibers (7) and a poured cement block (8), the testing steps being characterized in that:
1) a cement block (8) poured on the test piece is hooked by an upper opening groove of a T-shaped fixing groove (9), and the lower edge of a fiber (7) of the test piece is stuck on a paper (10) and clamped and fixed by a pneumatic chuck (11) of a testing instrument;
2) using displacement loading, the fiber was tensioned to force and then the test was run at 0.1 mm per minute starting the loading until the fiber pulled out or broke and the test was complete.
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| CN201910141654.9A CN109822724B (en) | 2019-02-26 | 2019-02-26 | Variable-thickness single fiber drawn cement-based test piece mold and adjusting and testing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110487715B (en) * | 2019-08-23 | 2022-05-27 | 淮阴工学院 | High-ductility cement-based material single fiber pulling-out test device and test method |
| CN110702492B (en) * | 2019-09-20 | 2022-09-16 | 同济大学 | Bidirectional single fiber pulled cement matrix test piece mold and manufacturing and application thereof |
| CN110530722B (en) * | 2019-10-15 | 2022-05-10 | 淮阴工学院 | High-ductility cement-based material uniaxial tension die, test piece manufacturing method and test method |
| CN111198155B (en) * | 2020-01-13 | 2021-07-20 | 西南交通大学 | Sample forming device and method for flexible fiber drawing test |
| 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 |
| CN113310780B (en) * | 2021-05-25 | 2023-06-13 | 北京中煤矿山工程有限公司 | Preparation method of laboratory cement grouting soil block |
| 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 |
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| CN203350092U (en) * | 2013-06-04 | 2013-12-18 | 李美娟 | Mould for manufacturing test sample for testing water-permeable coefficient of water-permeable cement concrete |
| CN104999546B (en) * | 2014-04-27 | 2017-08-25 | 郑州大学 | Grouted-aggregate concrete column test piece mould |
| CN204495702U (en) * | 2015-03-19 | 2015-07-22 | 金陵科技学院 | The proving installation of adhesive property is extracted from cement-based material for checking single fiber |
| CN104827550B (en) * | 2015-05-13 | 2017-02-22 | 中南大学 | Precracking rebar concrete sample molding die and sample molding method |
| JP6717163B2 (en) * | 2016-10-31 | 2020-07-01 | 日本製鉄株式会社 | Specimen, its manufacturing method, and corrosion test method |
| CN208476632U (en) * | 2018-07-20 | 2019-02-05 | 南京工程学院 | Prefabricated mortar crack test specimen makes mold |
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