CN110411828B - Using method of fiber-concrete drawing test device based on drawing bench - Google Patents
Using method of fiber-concrete drawing test device based on drawing bench Download PDFInfo
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- CN110411828B CN110411828B CN201910643863.3A CN201910643863A CN110411828B CN 110411828 B CN110411828 B CN 110411828B CN 201910643863 A CN201910643863 A CN 201910643863A CN 110411828 B CN110411828 B CN 110411828B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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Abstract
The invention discloses a use method of a fiber-concrete drawing test device based on a drawing bench, wherein the drawing test device comprises a forming device and a fixing device; the forming device comprises a base, a first cylinder and a positioning plate, wherein the first cylinder is arranged on the base, a first through hole is formed in the base, the positioning plate is movably arranged in the first cylinder or at the top of the first cylinder, a second through hole is formed in the positioning plate, and the first through hole and the second through hole correspond to each other in position; fixing device includes dowel bar, splint and can dismantle the second drum of connecting and forming by two semicylinders, and the both ends opening of second drum is all adducted and is formed first opening and second opening, and the dowel bar includes a baffle and follows the epitaxial extension of baffle. The drawing test device provided by the invention has the advantages of simple integral structure and strong applicability, can realize accurate positioning of the metal fibers in the small test piece, is suitable for fixing and clamping test pieces with different sizes, and avoids the defect that the traditional clamp clamps up and down to generate redundant extrusion force on the metal fibers.
Description
Technical Field
The invention relates to the technical field of concrete mechanical property testing, in particular to a use method of a fiber-concrete pulling test device based on a stretching table.
Background
One of the common methods for improving the brittleness of concrete materials at present is to compound fibers and concrete, and improve various mechanical properties of the concrete through the reinforcement effect of the fibers. The performance of steel fiber concrete mainly depends on the characteristics of a concrete matrix and steel fibers, the relative content of the concrete matrix and the steel fibers and the bonding strength of the fiber and the matrix interface, wherein the interface bonding strength is a key factor of the fiber for reinforcing, toughening and improving the crack resistance of the concrete. The quantitative determination of the interface bonding strength of the fiber and concrete matrix has great significance in the aspects of design of the steel fiber concrete mix proportion, establishment of a mechanical model of disordered distribution of fibers in a three-dimensional space, evaluation of slippage failure, calculation of the fiber concrete strength and selection of base materials and fiber types, and provides a more scientific theoretical basis for improvement of the steel fiber concrete performance.
For the characterization index of the bonding performance of the steel fiber concrete interface, no unified conclusion exists among all research results. At present, fiber drawing tests are generally adopted in the macroscopic mechanical test of the performance of the interface area, so that various drawing devices based on the macroscopic mechanical tests are designed for obtaining macroscopic mechanical test data, but the research on a microscopic level is very little.
The in-situ stretching table is combined with the SEM, so that mechanical dynamic research can be carried out on a test piece on a microscopic level, but the in-situ stretching table is mainly used for a tensile test of a metal test piece at present and cannot be applied to the field of UHPC (ultra high performance polycarbonate), and the main reason is that the design of the stretching table is difficult to adapt to the concrete sample preparation and loading mode at present. If the device is improved and is combined with a drawing table to be placed in a scanning electron microscope, microscopic observation can be realized in the drawing process of the steel fiber, not only macroscopic mechanical test data can be obtained, but also dynamic microscopic morphology of the interface of the fiber and a matrix can be obtained.
In addition, the structure is complicated still mostly to current device, and to in the concrete sample of tiny size, the inaccurate problem in fibre location, traditional device is fixed in the mode of centre gripping about mostly adopting when the test simultaneously, easily produces unnecessary extrusion force to the fibre, influences the accuracy of test result.
In conclusion, a testing device which is suitable for an in-situ stretching table, can realize accurate positioning of fibers in a concrete sample with a small size, is simple in overall structure and high in feasibility needs to be researched.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a fiber-concrete tensile testing apparatus based on a tensile testing table, which is used to solve the above problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fiber-concrete drawing test device based on a drawing bench comprises a forming device for forming a test piece and a fixing device for fixing the test piece;
the forming device comprises a base, a first cylinder and a positioning plate, wherein the first cylinder is arranged on the base, a first through hole for metal fibers or metal wires to pass through is formed in the base positioned at the bottom of the first cylinder, the positioning plate is movably arranged in the first cylinder or at the top of the first cylinder, a second through hole is formed in the positioning plate, and the first through hole and the second through hole are in mutual correspondence;
the fixing device comprises a dowel bar, a clamping plate and a second cylinder formed by detachably connecting two semi-cylinders, openings at two ends of the second cylinder are internally contracted to form a first opening and a second opening, the dowel bar comprises a baffle and an extension part extending along the baffle, the baffle is movably arranged at the first opening in the second cylinder, the size of the baffle is larger than that of the first opening, and the extension part extends outwards along the first opening; the clamping plate is arranged on the outer side of the second opening and used for fixing the metal fibers or the metal wires extending out of the second opening.
Preferably, the first through holes on the base comprise a plurality of first angle holes and first distance holes, the positioning plate comprises a built-in positioning plate and a top positioning plate, the built-in positioning plate and the top positioning plate are both provided with second through holes, the second through holes comprise a plurality of second angle holes and second distance holes, and the first angle holes and the second angle holes correspond to each other in position; the first distance holes and the second distance holes correspond to each other in position.
Preferably, a notch is formed in the edge of the built-in positioning plate, a first lug is formed in the edge of the top positioning plate, a convex strip corresponding to the notch is arranged on the inner side wall of the first cylinder, and a first lug groove corresponding to the first lug is arranged on the outer side wall of the top of the first cylinder.
Preferably, the built-in positioning plate and the top positioning plate are both provided with slurry overflow ports.
Preferably, a plurality of grooves matched with the bottom of the first cylinder are formed in the base, and a first through hole is formed in each groove.
Preferably, a second lug is formed on the outer side of the bottom of the first cylinder, and a second lug groove corresponding to the second lug is formed in the groove.
Preferably, the side walls of the two ends of the two semi-cylinders are respectively provided with a connecting plate along the diameter direction, a first screw hole is formed in each connecting plate, and a screw penetrates through the first screw holes to assemble the two semi-cylinders into a second cylinder.
Preferably, the side walls of the two semi-cylinders are provided with second screw holes.
The invention also aims to provide a use method of the fiber-concrete drawing test device based on the drawing bench, which comprises the following steps:
(1) penetrating metal fibers or metal wires through a first through hole in the base, installing a first cylinder, coating lubricating oil, wherein the coating position comprises the inner side wall of the first cylinder, and pouring concrete into the first cylinder;
(2) selecting a positioning plate according to the height of the poured concrete, selecting a built-in positioning plate when the height of the poured concrete is lower than that of the first cylinder, and selecting a top positioning plate when the height of the poured concrete is consistent with that of the first cylinder; the metal fiber or the metal wire penetrates through the second through hole of the positioning plate, the built-in positioning plate or the top positioning plate is covered, the notch of the built-in positioning plate is meshed and fixed with the convex strip in the first cylinder, and the first lug of the top positioning plate is meshed and fixed with the first lug groove of the first cylinder; extruding the excess concrete from the grout outlet;
(3) after the concrete is solidified for 24 hours, removing the mold to obtain a test piece, cutting off redundant metal fibers or metal wires in the test piece, and maintaining the test piece;
(4) the test piece after will maintaining is put into and is connected the second drum that the equipment formed by two semicylinders, puts into the first opening part in the second drum with the baffle of dowel steel simultaneously, passes the first screw hole on the connecting plate with the screw, fixes the second drum, and the extension of dowel steel stretches out first opening, and metal fiber or wire in the test piece stretch out through the second opening, fixes through splint, can pack into the tensile platform and carry out tensile test.
Preferably, in the step (4), when the diameter of the test piece is smaller than that of the second cylinder, the test piece is fixed by passing a screw through a second screw hole on the second cylinder.
The invention has the beneficial effects that:
(1) the fiber drawing test device provided by the invention can be adapted to an in-situ drawing table, so that the dynamic micro morphology of a fiber-concrete test piece can be conveniently obtained, the overall structure is simple, the applicability is strong, and the accurate positioning of metal fibers in a small test piece can be realized;
(2) the second cylinder is arranged in a detachable connection assembly mode and is suitable for test pieces with different sizes; the two ends of the second cylinder are internally provided with the openings to limit the movement of concrete in the stretching stress direction, so that the defect that the traditional clamp clamps up and down to generate redundant extrusion force on metal fibers or metal wires is avoided; meanwhile, the dowel bar is conveniently and movably arranged in the second cylinder, the installation is convenient and rapid, and the tensile test is more stable;
(3) the method is suitable for fiber-concrete test piece shapes with different types of metal fibers, different doping amounts, different metal fiber intervals and different embedding angles and depths, and has diversified functions.
Drawings
FIG. 1 is a schematic view of the structure of the molding apparatus of the present invention;
FIG. 2 is a schematic view of the construction of a first cylinder of the present invention;
FIG. 3 is a schematic view of the positioning plate of the present invention;
FIG. 4 is a schematic view of the construction of the fastening device of the present invention;
FIG. 5 is a schematic view of the fixing device of the present invention from another perspective;
FIG. 6 is a schematic view of the second cylinder and the connecting plate according to the present invention;
fig. 7 is a schematic structural view of the dowel bar of the present invention.
Description of reference numerals:
100. a molding device; 110. a base; 111. a groove; 112. a second lug groove; 113. a first angled hole; 114. a first pitch hole; 115. a third screw hole; 120. a first cylinder; 121. a convex strip; 122. a first lug groove; 123. a second lug; 130. positioning a plate; 131. a top positioning plate; 131a, a first lug; 131b, second pitch holes; 131c, a second angled hole; 131d and a pulp overflow port; 132. a positioning plate is arranged inside; 132a, a notch; 132b, second pitch holes; 132c, a second angled hole; 132d, a slurry overflow port; 200. a fixing device; 210. a semi-cylinder; 211. a second screw hole; 220. a dowel bar; 221. an extension portion; 222. a baffle plate; 230. a splint; 240. a connecting plate; 241. a first screw hole; 250. a screw; 260. a second opening; 270. a first opening.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
Referring to fig. 1 to 7, a fiber-concrete drawing test apparatus based on a tensile stage includes a molding apparatus 100 for molding a test piece and a fixing apparatus 200 for fixing the test piece;
the forming device 100 includes a base 110, a first cylinder 120 and a positioning plate 130, wherein the first cylinder 120 is disposed on the base 110, and a first through hole for passing a metal fiber or a metal wire is disposed on the base 110 at the bottom of the first cylinder 120, in this embodiment, the metal fiber is preferably a steel fiber, the positioning plate 130 is movably disposed inside or at the top of the first cylinder 120, a second through hole is disposed on the positioning plate 130, and positions of the first through hole and the second through hole correspond to each other;
the fixing device 200 comprises a dowel bar 220, a clamping plate 230 and a second cylinder formed by detachably connecting two semi-cylinders 210, wherein openings at two ends of the second cylinder are respectively contracted to form a first opening 270 and a second opening 260, the dowel bar 220 comprises a baffle plate 222 and an extension part 221 extending along the extension of the baffle plate 222, the baffle plate 222 is movably arranged at the first opening 270 in the second cylinder, the size of the baffle plate is larger than that of the first opening 270, and the extension part 221 extends outwards along the first opening 270; the clamping plate 230 is disposed outside the second opening 270, and is used for fixing the metal fiber or the metal wire extending from the second opening 270.
In the embodiment, the integral structure is simple, the applicability is strong, and the accurate positioning of the metal fibers can be realized through the arrangement of the structures such as the base 110, the positioning plate 130 and the like; the second cylinder is arranged in a detachable connection assembly mode and is suitable for test pieces with different sizes; the two ends of the second cylinder are internally provided with the openings to limit the movement of concrete in the stretching stress direction, so that the defect that the traditional clamp clamps up and down to generate redundant extrusion force on metal fibers or metal wires is avoided; meanwhile, the dowel bar 220 is conveniently and movably arranged in the second cylinder, so that the installation is convenient and rapid, and the dowel bar is not easy to fall off and is more stable when being used for tensile test.
With continued reference to fig. 1 and fig. 2, a plurality of grooves 111 matching with the bottom of the first cylinder 120 are formed on the base 110, and each groove 111 is provided with a first through hole therein, so as to facilitate placement of the first cylinder 120 and realize batch casting of the test piece. Further, a second lug 123 is formed on the outer side of the bottom of the first cylinder 120, a second lug groove 112 corresponding to the second lug 123 is formed in the groove 111, and when the first cylinder is placed, the second lug 123 is clamped with the second lug groove 112, so that the first cylinder 120 is prevented from moving in the groove 111, and meanwhile, subsequent detachment is facilitated. Of course, in some other embodiments, the first cylinder 120 and the base 110 may be fixed by other means, such as by bolts.
In the embodiment, as shown in fig. 4 to fig. 6, connecting plates 240 are formed at two end side walls of the two half cylinders 210 along a diameter direction, a first screw hole 241 is formed on each connecting plate 240, and a screw 250 passes through the first screw hole 241 to assemble the two half cylinders 210 into a second cylinder. Preferably, the connecting plate 240 is integrally formed with the half cylinder 210, thereby improving the structural strength thereof. In the illustrated embodiment, the side walls of the two half cylinders 210 are further provided with a plurality of second screw holes 211, so that screws can pass through the second screw holes 211 to fix a smaller test piece in the second cylinder, thereby performing a drawing test, and further improving the application range of the fixing device.
With continued reference to fig. 1 and 3, the first through holes of the base 110 include a plurality of first angle holes 113 and first distance holes 114, the positioning plate 130 includes a built-in positioning plate 132 and a top positioning plate 131, the built-in positioning plate 132 and the top positioning plate 131 are both provided with second through holes, the second through holes include a plurality of second angle holes 131c, 132c and second distance holes 131b, 132b, and the first angle holes 113 and the second angle holes 131c, 132c are located corresponding to each other; the first pitch holes 114 and the second pitch holes 131b and 132b are located to correspond to each other. Specifically, the pitch between the second through holes should not be greater than the aperture of the second opening, and through setting up a plurality of angle holes and pitch hole, can make forming device can be applicable to the shaping of the test piece of different kind metal fiber, different incorporation volume, different metal fiber intervals and different embedding angles and degree of depth, and the function is more diversified. In addition, a plurality of third screw holes 115 are further arranged outside the groove 111 on the base 110, and screws are also arranged at the third screw holes 115 and used for fixing redundant metal fibers or metal wires in the test piece forming process, so that the metal fibers or the metal wires in the test piece are in a straightened state.
As a further improvement of this embodiment, referring to the subject 2 and fig. 3 again, a notch 132a is formed in an edge of the built-in positioning plate 132, a first lug 131a is formed at an edge of the top positioning plate 131, a convex strip 131 corresponding to the notch 132a is arranged on an inner side wall of the first cylinder 130, and a first lug groove 122 corresponding to the first lug 131a is arranged on an outer side wall of the top of the first cylinder 130, so that accurate positioning of the metal fiber in the concrete is further improved, and accuracy of testing performance of the test piece is improved. Grout outlets 131d and 132d are formed in the built-in positioning plate 132 and the top positioning plate 131, so that redundant concrete is removed during pouring, and the size of a test piece is guaranteed.
Example 2
Based on the apparatus of embodiment 1, this embodiment provides a method for using a fiber-concrete tensile testing apparatus based on a tensile station, which includes the following steps:
(1) penetrating metal fibers or metal wires through a first through hole in the base 110, installing a first cylinder 120, smearing lubricating oil, wherein the smearing position comprises the inner side wall of the first cylinder 120, and pouring concrete into the first cylinder; before pouring, a thin paper sheet is selected to pad the bottom of the first cylinder 120, or a screw is selected to seal the first through hole which does not penetrate through the metal fiber; in this embodiment, the metal fibers may be steel fibers or steel precursor;
(2) selecting a positioning plate 130 according to the height of the cast concrete, selecting a built-in positioning plate 132 when the height of the cast concrete is lower than that of the first cylinder 120, and selecting a top positioning plate 131 when the height of the cast concrete is consistent with that of the first cylinder 120; a metal fiber or a metal wire is passed through the second through hole of the positioning plate 130, and when the built-in positioning plate 132 or the top positioning plate 131 is covered, the notch 132a of the built-in positioning plate 132 is engaged and fixed with the convex strip 121 in the first cylinder 120, and the first lug 131a of the top positioning plate 131 is engaged and fixed with the first lug groove 122 of the first cylinder 120; extruding the excess concrete from the grout outlets 131d, 132 d;
(3) after the concrete is solidified for 24 hours, removing the mold to obtain a test piece, cutting off redundant metal fibers or metal wires in the test piece, and maintaining the test piece;
(4) placing the cured test piece into a second cylinder formed by connecting and assembling two semi-cylinders 210, simultaneously placing a baffle 222 of a dowel bar into a first opening 270 in the second cylinder, penetrating a screw 250 through a first screw hole 241 on a connecting plate 240 to fix the second cylinder, extending an extension part 221 of the dowel bar out of the first opening 270, extending metal fibers or metal wires in the test piece out through a second opening 260, fixing the metal fibers or the metal wires through a clamping plate 230, and then placing the test piece into a drawing bench for drawing test, wherein the interface morphology of the metal fibers and a concrete matrix can be observed through the second opening 260 during the test; furthermore, in order to facilitate observation of the dynamic micro-morphology of the interface between the metal fiber and the concrete matrix, the stretching table can be placed in a scanning electron microscope bin for observation and test, so that dynamic research of a micro-layer in the fiber-concrete drawing process is realized.
Further, in step (1), after the metal fiber or the metal wire is passed through the first through hole on the base 110, the metal fiber or the metal wire positioned at the lower part of the base is passed through the third screw hole 115 on the base and then fixed by using a screw, so that the metal fiber in the concrete can be in a straightened state during casting. In step (4), when the diameter of the test piece is smaller than that of the second cylinder, the test piece is fixed by passing a screw through the second screw hole 211 on the second cylinder.
In addition, for the metal fiber or the metal wire which needs to be embedded at different angles, for example, when the steel wire is used, the steel wire can penetrate through different through holes of the base and the positioning plate to realize the placement at different angles, and when the angle limit is exceeded, the placement can be realized by reducing the pouring height. For special-shaped or shorter steel wires, the through holes on the base can be sealed by paper sheets or screws, concrete is poured to a certain height, and the short steel wires are inserted into the slurry.
The method can realize the precise arrangement of the metal fibers or the metal wires in the small-size concrete test piece, is suitable for the fiber-concrete test piece shapes of different types of metal fibers, different doping amounts, different metal fiber intervals and different embedding angles and depths, and has convenient and quick operation and wide applicability.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A use method of a fiber-concrete drawing test device based on a drawing bench is characterized by comprising a forming device for forming a test piece and a fixing device for fixing the test piece;
the forming device comprises a base, a first cylinder and a positioning plate, wherein the first cylinder is arranged on the base, a first through hole for metal fibers or metal wires to pass through is formed in the base positioned at the bottom of the first cylinder, the positioning plate is movably arranged in the first cylinder or at the top of the first cylinder, a second through hole is formed in the positioning plate, and the first through hole and the second through hole are in mutual correspondence;
the fixing device comprises a dowel bar, a clamping plate and a second cylinder formed by detachably connecting two semi-cylinders, openings at two ends of the second cylinder are internally contracted to form a first opening and a second opening, the dowel bar comprises a baffle and an extension part extending along the baffle, the baffle is movably arranged at the first opening in the second cylinder, the size of the baffle is larger than that of the first opening, and the extension part extends outwards along the first opening; the clamping plate is arranged on the outer side of the second opening and used for fixing the metal fibers or the metal wires extending out of the second opening;
the first through holes in the base comprise a plurality of first angle holes and a plurality of first spacing holes, the positioning plate comprises a built-in positioning plate and a top positioning plate, second through holes are formed in the built-in positioning plate and the top positioning plate respectively, the second through holes comprise a plurality of second angle holes and a plurality of second spacing holes, and the first angle holes and the second angle holes correspond to each other in position; the positions of the first spacing holes and the second spacing holes correspond to each other;
slurry overflow ports are formed in the built-in positioning plate and the top positioning plate; connecting plates are formed on the side walls of the two ends of each of the two semi-cylinders along the diameter direction, a first screw hole is formed in each connecting plate, and a screw penetrates through the first screw holes to assemble the two semi-cylinders into a second cylinder;
the use steps of the forming device and the fixing device are as follows:
penetrating metal fiber or metal wire through a first through hole on a base, installing a first cylinder, coating lubricating oil, wherein the coating position comprises the inner side wall of the first cylinder, and pouring concrete to the first cylinder
Inside the cylinder;
selecting a positioning plate according to the height of the poured concrete, selecting a built-in positioning plate when the height of the poured concrete is lower than that of the first cylinder, and selecting a top positioning plate when the height of the poured concrete is consistent with that of the first cylinder; the metal fiber or the metal wire penetrates through the second through hole of the positioning plate, the built-in positioning plate or the top positioning plate is covered, the notch of the built-in positioning plate is meshed and fixed with the convex strip in the first cylinder, and the first lug of the top positioning plate is meshed and fixed with the first lug groove of the first cylinder; extruding the excess concrete from the grout outlet;
after the concrete is solidified for 24 hours, removing the mold to obtain a test piece, cutting off redundant metal fibers or metal wires in the test piece, and maintaining the test piece;
the test piece after will maintaining is put into and is connected the second drum that the equipment formed by two semicylinders, puts into the first opening part in the second drum with the baffle of dowel steel simultaneously, passes the first screw hole on the connecting plate with the screw, fixes the second drum, and the extension of dowel steel stretches out first opening, and metal fiber or wire in the test piece stretch out through the second opening, fixes through splint, can pack into the tensile platform and carry out tensile test.
2. The use method of the fiber-concrete pulling test device based on the tensile station as claimed in claim 1, wherein a notch is formed in the edge of the built-in positioning plate, a first lug is formed in the edge of the top positioning plate, a convex strip corresponding to the notch is arranged on the inner side wall of the first cylinder, and a first lug groove corresponding to the first lug is arranged on the outer side wall of the top of the first cylinder.
3. The use method of the fiber-concrete drawing test device based on the drawing bench as claimed in claim 1, wherein a plurality of grooves matched with the bottom of the first cylinder are formed on the base, and each groove is provided with a first through hole.
4. The use method of the fiber-concrete drawing test device based on the drawing bench is characterized in that a second lug is formed on the outer side of the bottom of the first cylinder, and a second lug groove corresponding to the second lug is formed in the groove.
5. The use method of the fiber-concrete drawing test device based on the drawing bench as claimed in claim 1, wherein the side walls of the two half cylinders are provided with second screw holes.
6. The method for using the fiber-concrete drawing test device based on the tensile stage according to claim 1, wherein in the step (4), when the diameter of the test piece is smaller than that of the second cylinder, the test piece is fixed by passing a screw through the second screw hole of the second cylinder.
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| CN201910643863.3A CN110411828B (en) | 2019-07-17 | 2019-07-17 | Using method of fiber-concrete drawing test device based on drawing bench |
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| CN112378747B (en) * | 2020-10-19 | 2023-09-01 | 河北汉光重工有限责任公司 | Tension experiment mechanism for aviation tray mooring ring |
| CN114062078B (en) * | 2021-11-08 | 2023-08-18 | 福州大学 | Sample forming device for curve fiber drawing test |
| CN114953125A (en) * | 2022-05-25 | 2022-08-30 | 安徽理工大学 | Six-in-one cylinder mould |
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| CN103969183A (en) * | 2014-05-20 | 2014-08-06 | 天地科技股份有限公司 | Test device and method for testing bonding strength of anchor rod or anchor rope and concrete |
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| CN206248443U (en) * | 2016-11-01 | 2017-06-13 | 昆明理工大学 | A kind of metal tensile test auxiliary clamp |
| CN107764738A (en) * | 2017-10-26 | 2018-03-06 | 吉林建筑大学 | Steel fibre draw-off gear in a kind of concrete |
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