CN111198155A - Sample forming device and method for flexible fiber drawing test - Google Patents
Sample forming device and method for flexible fiber drawing test Download PDFInfo
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- CN111198155A CN111198155A CN202010033291.XA CN202010033291A CN111198155A CN 111198155 A CN111198155 A CN 111198155A CN 202010033291 A CN202010033291 A CN 202010033291A CN 111198155 A CN111198155 A CN 111198155A
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- 239000013305 flexible fiber Substances 0.000 title claims abstract description 75
- 238000012360 testing method Methods 0.000 title claims abstract description 59
- 238000012681 fiber drawing Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 239000004568 cement Substances 0.000 claims description 35
- 239000000463 material Substances 0.000 claims description 25
- 239000011159 matrix material Substances 0.000 claims description 13
- 239000004570 mortar (masonry) Substances 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 8
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 description 8
- 239000004567 concrete Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 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
- 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
-
- 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
-
- 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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- 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)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a sample forming device for a flexible fiber drawing test, which comprises a fiber fixing device, wherein the fiber fixing device is arranged on the sample forming device; the fiber fixing device is used for fixing the flexible fibers required by the test to obtain a thin plate with the flexible fibers; the fiber fixing device comprises a base, two lifting supports positioned on the base, two positioning clamps fixed on the base and a thin plate arranged on the two positioning clamps. The invention provides the sample forming device and the sample forming method which are simple, convenient and easy to operate, can adjust the height and the angle and have high accuracy and can be used for the flexible fiber drawing test, and the sample forming device and the sample forming method are suitable for flexible fibers and other samples which are soft and not easy to fix.
Description
Technical Field
The invention relates to the technical field of building materials and tests, in particular to a sample forming device and a sample forming method for a flexible fiber drawing test.
Background
The concrete has the inherent defects of great weight, large shrinkage, low tensile strength, poor deformability, low ultimate elongation, large brittleness, easy generation of cracks and the like, and the advantages of the concrete cannot be fully exerted. The fiber composite cement-based material is a composite material which is prepared by taking portland cement as a matrix, taking organic or inorganic fibers and the like as reinforcements, adding fillers, chemical auxiliaries and water and performing a composite process. It can optimize the original defects of cement-based materials, strengthen and toughen the cement-based materials, improve the tensile strength, the bending strength and the impact strength of the cement-based materials, and control the expansion of cracks. The fiber types can be divided into rigid fibers and flexible fibers, and the application fields almost cover industrial and civil buildings, railways and road engineering, bridges and tunnel engineering. Compared with common concrete, the flexible fiber concrete has obviously improved deformation performance after cracking, obviously improved bending toughness and fracture toughness, reduced shrinkage and creep deformation to some extent compared with common concrete, can restrain initiation and expansion of microcracks in the concrete, and improves fatigue resistance, impact resistance, freeze-thaw resistance and impermeability.
In the fiber cement composite material, the interface bonding strength and the interface effect of the fiber material and the cement-based material directly influence the performance of the fiber material and the physical and mechanical properties of the composite material. The interaction between the fibers and the cement matrix is a key parameter of the performance of the composite material, and the interface characteristics ensure the stress transfer between the matrix and the fibers. On the premise of ensuring the performance of the flexible fiber, one fundamental reason influencing the composite effect of the flexible fiber and the cement-based material is the interface bonding performance between the flexible fiber chopped strands (bundles) and the cement-based material. Therefore, the test of the bonding performance of the flexible fibers and the cement-based material is crucial to the development of fiber cement-based materials.
The simplest, economic and practical method for researching the bonding performance is to directly draw the fiber and the matrix, and the research on the mechanical model of the drawing interface is also an important component of the research on the reinforcing and toughening mechanism of the composite material. At present, the device and the test method for the drawing test of the flexible fiber and the cement-based interface are still imperfect, the diameter and the sectional area of the fiber are extremely small, so that a certain difficulty is caused in directly drawing the monofilament of the fiber, meanwhile, the flexible fiber is relatively soft, the displacement of the fiber is easily caused by pouring cement-based materials at two ends of the fiber, the control is not easy, and the forming is relatively difficult.
Disclosure of Invention
Aiming at the technical problems, the invention provides the sample forming device and the sample forming method which are simple, convenient and easy to operate, can adjust the height and the angle, have high accuracy and can be used for the flexible fiber drawing test, and are suitable for flexible fibers and other soft and difficultly fixed samples.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a sample forming device for a flexible fiber drawing test comprises a fiber fixing device; the fiber fixing device is used for fixing the flexible fibers required by the test to obtain a thin plate with the flexible fibers; the fiber fixing device comprises a base, two lifting supports positioned on the base, two positioning clamps fixed on the base and a thin plate arranged on the two positioning clamps;
the upper surface of the base is provided with a groove, the scale values made of millimeters are symmetrically arranged on one side of the long edge of the groove by taking the middle part of the groove as a zero scale center, the two lifting supports are respectively arranged on the left side and the right side of the groove, each lifting support comprises a support plate which is arranged on the groove in a sliding mode, two round rods which are connected to the upper ends of the two sides of the support plate and are provided with scales, sleeves which are sleeved on the round rods and a cross rod which is connected between the two sleeves; an angle gauge is installed on a sleeve of one of the lifting supports, a positioning bolt is arranged on the sleeve, the fixed height of the sleeve on the round rod is adjusted by fastening the positioning bolt after the sleeve moves up and down, a square hole with a pointer is arranged on one side, with a scale value, of the base on the supporting plate, and a fastening bolt capable of fixing the position of the supporting plate on the base is arranged in the middle of the supporting plate; the base is symmetrically provided with two positioning clamps by taking the groove as a reference at a zero scale value on the surface, the base fixes a thin plate through the two positioning clamps, and a round hole for penetrating through flexible fibers to be fixed is formed in the center of the thin plate.
And further, the forming die is used for placing the flexible fibers with the thin plates and further fixing and forming the flexible fibers with the cement-based material.
Further, forming die is including controlling two half templates, and the fixing bolt through both ends links together between two half templates, passes through bolted connection, every with the bottom plate of bottom after connecting between two half templates set up all three spaced apart half sample die cavities on the half template, two half template has in the hookup location after connecting and is used for the card to establish the draw-in groove of placing the sheet metal.
Further, the specification of the thin plate is 23mm x 0.5mm, and a circular hole with the diameter of about 1mm is formed in the middle of the thin plate.
The invention also provides a sample forming method for the flexible fiber drawing test, and the sample forming method for the fiber cement-based material binding force drawing test by adopting the sample forming device comprises the following steps:
preparation work:
corresponding chopped fiber samples were prepared according to the designed length for the flexible fibers required for the test, 23mm x 0.5mm sheets were prepared and the constituent materials of the cement matrix required for the test were weighed.
Assembling the fiber fixing device:
firstly, a base of a fiber fixing device is placed on a horizontal desktop, two lifting supports are placed on grooves in the base, the positions of supporting plates of the lifting supports are adjusted through left-right sliding, when pointers on square holes of the supporting plates correspond to designed scales, fastening bolts on the supporting plates are screwed, then the heights of sleeves of the lifting supports are adjusted, positioning bolts on the sleeves are screwed after the heights are adjusted, and if the embedding angles of flexible fibers in a cement matrix need to be controlled, the embedding angles of the flexible fibers are obtained by adjusting the height difference of cross rods on two sides; and then fixing the thin plate with the holes on a positioning clamp on the scale mark 0, penetrating the flexible fibers into a preset circular hole of the thin plate, fixing two ends of the flexible fibers on a cross bar of a lifting support by using a positioning adhesive tape, filling glue into the circular hole of the thin plate, and curing the glue to obtain the thin plate with the fibers required by the test.
Assembling a forming die and pouring a test piece:
the forming die is assembled by screwing the fixing bolts at two ends, the thin plate with fibers obtained in the step is placed in a clamping groove of the forming die, after a release agent is coated on the thin plate and the forming die, the cement-based material which is fully and uniformly stirred is poured into the forming die, the test piece is immediately placed into a standard curing room after being formed and cured to a set age, and the test piece required by the flexible fiber drawing test is obtained after the curing is finished.
Further, in the step (3), the step of pouring the cement-based material into the forming mold is as follows:
firstly, injecting mortar to the middle of the thin plate and just contacting with the lower edge of the flexible fiber, and fully vibrating; continuously injecting mortar until the mortar just covers the flexible fibers, and continuously vibrating for a certain time; and finally, filling the mortar into the forming die and continuously vibrating.
Compared with the prior art, the invention has the following beneficial effects:
(1) as the diameter and the sectional area of the flexible fiber are extremely small and can reach micron level, and the flexible fiber is brittle, if the flexible fiber is directly clamped in a test, two ends of the fiber are damaged, and the measured data can not reflect the real characteristics of the fiber. Aiming at the problems, the fiber and the thin plate can be fixed, the two ends of the fiber are embedded into the cement matrix, one end of the obtained sample is provided with a fixed end, and the other end is a pull-out end, so that the phenomenon of experimental error caused by fiber damage in the testing process by using a flat clamping mode or a winding mode in the existing experimental design can be avoided.
(2) The fixing device can adjust the distance between the lifting supports and the height of the cross rod through the designed embedded depth and embedded angle of the fiber, is flexible, efficient and repeatable, and can achieve the aim of performing test measurement design on the fiber with different lengths and embedded angles required by a designer.
(3) The device is simple and easy to manufacture, low in manufacturing cost and reusable.
Drawings
FIG. 1 is a schematic view of the overall construction of the fiber fixation device of the present invention;
FIG. 2 is a top view of the fiber fixation device of the present invention;
FIG. 3 is a schematic view of the connection of the sleeve 7 with the angle gauge 11 and the round bar 6 according to the present invention;
FIG. 4 is a side view of the fiber fixation device of the present invention;
FIG. 5 is a schematic view of the positioning clip 3 of the present invention;
FIG. 6 is a schematic view of the forming die of the present invention in its entirety;
FIG. 7 is a schematic view of the position of the slot after the forming mold is connected;
FIG. 8 is a schematic representation of a molded sample obtained in accordance with the present invention;
figure 9 is a schematic of the flexible fiber cement based pull test loading.
Description of reference numerals:
1. a base; 2. a liftable bracket; 3. positioning clips; 4. a groove; 5. a support plate; 6. a round bar; 7. a sleeve; 8. a cross bar; 9. positioning the bolt; 10. a thin plate; 11. an angle gauge; 12. a square hole; 13. a flexible fiber; 14. fastening a bolt; 15. forming a mold; 16. half-edge template; 17. a half sample die cavity; 18. fixing the bolt; 19. a card slot; 20. a circular hole.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1 to 9, an embodiment of the present invention provides a sample forming apparatus for a flexible fiber drawing test, including a fiber fixing device; the fiber fixing device is used for fixing the flexible fibers 13 required by the test to obtain the sheet 10 with the flexible fibers; the fiber fixing device comprises a base 1, two lifting supports 2 positioned on the base 1, two positioning clamps 3 fixed on the base 1 and a thin plate 10 arranged on the two positioning clamps 3;
the upper surface of the base 1 is provided with a groove 4, the scale values of millimeter system are symmetrically arranged on one side of the long edge of the groove 4 by taking the middle part of the groove as a zero scale center, in the embodiment, the scale values of two sides are up to 4mm, the two lifting supports 2 are respectively arranged on the left side and the right side of the groove 4, each lifting support 2 comprises a support plate 5 which is arranged on the groove 4 in a sliding manner, two round rods 6 which are connected to the upper ends of the two sides of the support plate and are provided with scales, sleeves 7 which are sleeved on the round rods 6 and a cross rod 8 which is connected between the; an angle instrument 11 is installed on a sleeve 7 of one of the lifting supports 2 and can be used for adjusting the embedding angle of a fiber sample in a cement matrix, a positioning bolt 9 is arranged on the sleeve 7, the fixed height of the sleeve 7 on a round rod 6 is adjusted by fastening the positioning bolt 9 after the sleeve 7 moves up and down, a square hole 12 with a pointer is arranged on one side, with a scale value, of the base 1 on the supporting plate 5, and a fastening bolt 14 capable of fixing the position of the supporting plate on the base 1 is arranged in the middle of the supporting plate 5; two positioning clamps 3 are symmetrically installed at the zero scale value on the surface of the base 1 by taking the groove as a reference, the base 1 fixes the thin plate 10 through the two positioning clamps 3, and a round hole 20 for penetrating through the flexible fiber to be fixed is formed in the center of the thin plate 10.
In the embodiment of the present invention, the sample forming apparatus for the flexible fiber drawing test further includes a forming die 15, and the forming die 15 is used for placing the flexible fibers 13 with the thin plate 10 and further fixing and forming the flexible fibers with the cement-based material.
The forming die 15 comprises a left half die plate and a right half die plate 16, the two half die plates 16 are connected together through fixing bolts 18 at two ends, the two half die plates 16 are connected with a bottom plate at the bottom through bolts, each half die plate 16 is provided with three spaced half sample die cavities 17, and the two half die plates 16 are provided with clamping grooves 19 used for clamping and placing the thin plate 10 at the connecting positions after being connected.
In the present example, the sheet 10 has a specification of 23mm x 0.5mm, and the center portion of the sheet 10 is provided with a circular hole 20 having a diameter of about 1 mm.
The sample forming method for the flexible fiber drawing test provided by the embodiment of the invention adopts the sample forming device to form the sample for the fiber cement-based material adhesion drawing test, and comprises the following steps:
(1) preparation work:
corresponding chopped fiber samples were prepared according to the designed length of the flexible fibers required for the test, and sheets 10 of 23mm x 0.5mm were prepared and weighed for each constituent material of the cement matrix required for the test.
(2) Assembling the fiber fixing device:
firstly, a base 1 of a fiber fixing device is placed on a horizontal desktop, two lifting supports 2 are placed on a groove 4 on the base 1, the positions of supporting plates 5 of the lifting supports 2 are adjusted through left-right sliding, when pointers on square holes 12 of the supporting plates 5 correspond to designed scales, fastening bolts 14 on the supporting plates 5 are screwed, then the heights of sleeves 7 of the lifting supports 2 are adjusted, positioning bolts 9 on the sleeves 7 are screwed after the heights are adjusted, and if the embedding angles of flexible fibers 13 in a cement matrix need to be controlled, the embedding angles of the flexible fibers 13 are obtained by adjusting the height difference of cross rods 8 on two sides; fixing the perforated thin plate 10 on the positioning clamp 3 on the scale mark 0, penetrating the flexible fiber 13 into a preset round hole 20 of the thin plate 10, fixing two ends of the flexible fiber 13 on the cross bar 8 of the lifting support 2 by using a positioning adhesive tape, filling glue into the round hole 20 of the thin plate 10, and obtaining the thin plate with fibers required by the test after the glue is cured, wherein the glue is Zhangida E7000 glue.
(3) Assembling a forming die and pouring a test piece:
assembling the forming die 15 by screwing the fixing bolts 18 at two ends, placing the thin plate 10 with fibers obtained in the step 2 into a clamping groove 20 of the forming die 15, coating a release agent on the thin plate 10 and the forming die 15, pouring a cement-based material which is fully and uniformly stirred into the forming die 15, immediately placing the test piece into a standard curing room after forming for curing to a set age, obtaining a test piece required by a flexible fiber drawing test after finishing curing, wherein the schematic diagram of the obtained test piece is shown in fig. 8. Three test pieces can be molded in the molding die 15 at one time, and after a flexible fiber with a thin plate is fixed by the fiber fixing device, the flexible fiber can be taken down and placed in one of the clamping grooves in the molding die 15, and the flexible fiber is well placed in the clamping groove of the molding device in three times. As shown in FIG. 9, the test piece reaching age is put on a test device for a drawing test, and a displacement loading program is set for 0.02mm/min until the fiber is pulled out or broken from the cement matrix, so that the plate drawing test can be carried out.
In the step (3), the step of pouring the cement-based material into the forming mold 15 is as follows:
firstly, injecting mortar to the middle of the thin plate and just contacting with the lower edge of the flexible fiber, and fully vibrating; continuously injecting mortar until the mortar just covers the flexible fibers, and continuously vibrating for a certain time; and finally, filling the forming die 15 with mortar, and continuing vibrating.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A sample forming device for a flexible fiber drawing test is characterized by comprising a fiber fixing device; the fiber fixing device is used for fixing the flexible fibers (13) required by the test to obtain a thin plate (10) with the flexible fibers; the fiber fixing device comprises a base (1), two lifting supports (2) positioned on the base (1), two positioning clamps (3) fixed on the base (1) and a thin plate (10) arranged on the two positioning clamps (3);
the upper surface of the base (1) is provided with a groove (4), the scale values made by millimeters are symmetrically arranged on one side of the long edge of the groove (4) by taking the middle part of the groove as a zero scale center, the two lifting supports (2) are respectively arranged on the left side and the right side of the groove (4), each lifting support (2) comprises a supporting plate (5) which is arranged on the groove (4) in a sliding manner, two round rods (6) which are connected to the upper ends of the two sides of the supporting plate and are provided with scales, sleeves (7) sleeved on the round rods (6) and a cross rod (8) connected between the two sleeves (7); an angle gauge (11) is installed on a sleeve (7) of one of the lifting supports (2), a positioning bolt (9) is arranged on the sleeve (7), the fixed height of the sleeve (7) on the round rod (6) is adjusted by fastening the positioning bolt (9) after the sleeve (7) moves up and down, a square hole (12) with a pointer is formed in one side, with a scale value, of the base (1) on the supporting plate (5), and a fastening bolt (14) capable of fixing the position of the supporting plate on the base (1) is arranged in the middle of the supporting plate (5); two locating clips (3) are installed as the benchmark symmetry in zero scale value department recess on the surface to base (1), base (1) is through two locating clips (3) fixed sheet metal (10), the central point of sheet metal (10) puts and offers round hole (20) that are used for passing the flexible fiber of treating fixed.
2. The sample forming device for the flexible fiber drawing test is characterized by further comprising a forming die (15), wherein the forming die (15) is used for placing the flexible fibers (13) with the thin plate (10) and further fixing and forming the flexible fibers with the cement-based material.
3. The sample forming device for the flexible fiber drawing test is characterized in that the forming die (15) comprises a left half die plate and a right half die plate (16), the two half die plates (16) are connected together through fixing bolts (18) at two ends, the two half die plates (16) are connected with a bottom plate through bolts after being connected, each half die plate (16) is provided with three spaced half sample die cavities (17), and the two half die plates (16) are provided with clamping grooves (19) for clamping and placing the thin plate (10) after being connected.
4. A sample-forming device for the drawing test of flexible fibres, as claimed in any one of claims 1 to 3, characterised in that the sheet (10) has a specification of 23mm x 0.5mm and the sheet (10) has a circular hole (20) in the middle of the sheet having a diameter of about 1 mm.
5. A sample forming method for a flexible fiber drawing test, characterized in that the sample forming method for the fiber cement-based material adhesion force drawing test by using the sample forming device of claim 1 comprises the following steps:
(1) preparation work:
corresponding chopped fiber samples were prepared according to the designed length from the flexible fibers required for the test, and sheets (10) 23mm x 0.5mm were prepared and weighed for each constituent material of the cement matrix required for the test.
(2) Assembling the fiber fixing device:
firstly, a base (1) of a fiber fixing device is placed on a horizontal desktop, two lifting supports (2) are placed on a groove (4) on the base (1), the positions of supporting plates (5) of the lifting supports (2) are adjusted through left-right sliding, when pointers on square holes (12) of the supporting plates (5) correspond to designed scales, fastening bolts (14) on the supporting plates (5) are screwed, then the heights of sleeves (7) of the lifting supports (2) are adjusted, positioning bolts (9) on the sleeves (7) are screwed after the heights are adjusted, and if the embedding angles of flexible fibers (13) in a cement matrix need to be controlled, the embedding angles of the flexible fibers (13) are obtained by adjusting the height difference of cross rods (8) on two sides; and then fixing the thin plate (10) with the holes on a positioning clamp (3) on the scale mark 0, penetrating flexible fibers (13) through a preset round hole (20) of the thin plate (10), fixing two ends of the flexible fibers (13) on a cross bar (8) of a lifting support (2) by using positioning adhesive tapes, filling glue into the round hole (20) of the thin plate (10), and obtaining the thin plate with the fibers required by the test after the glue is cured.
(3) Assembling a forming die and pouring a test piece:
assembling the forming die (15) by screwing the fixing bolts (18) at two ends, placing the thin plate (10) with fibers obtained in the step (2) into a clamping groove (20) of the forming die (15), coating a release agent on the thin plate (10) and the forming die (15), pouring the cement-based material which is fully and uniformly stirred into the forming die (15), immediately placing the test piece into a standard curing chamber after forming to cure to a set age, and obtaining the test piece required by the flexible fiber drawing test after curing.
6. The method for forming a test specimen for the flexible fiber drawing test according to claim 5, wherein in the step (3), the step of pouring the cement-based material into the forming die (15) is as follows:
firstly, injecting mortar to the middle of the thin plate and just contacting with the lower edge of the flexible fiber, and fully vibrating; continuously injecting mortar until the mortar just covers the flexible fibers, and continuously vibrating for a certain time; and finally, filling the molding die (15) with mortar, and continuing vibrating.
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| CN202010033291.XA CN111198155B (en) | 2020-01-13 | 2020-01-13 | Sample forming device and method for flexible fiber drawing test |
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| CN202010033291.XA CN111198155B (en) | 2020-01-13 | 2020-01-13 | Sample forming device and method for flexible fiber drawing test |
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| CN113686681A (en) * | 2021-09-06 | 2021-11-23 | 广州大学 | Drawing test device and method for fibers with different embedding angles and embedding lengths |
| CN113916664A (en) * | 2021-11-30 | 2022-01-11 | 中国科学院、水利部成都山地灾害与环境研究所 | Soil root system drawing and shearing integrated testing device |
| CN114062078A (en) * | 2021-11-08 | 2022-02-18 | 福州大学 | Sample forming device for curve fiber drawing test |
| CN114354486A (en) * | 2022-01-06 | 2022-04-15 | 江苏科技大学 | Device and method for testing bonding performance of geomembrane |
| CN114923751A (en) * | 2022-05-17 | 2022-08-19 | 福州大学 | Accurate positioning method for curve fiber sample forming device |
| CN114942167A (en) * | 2022-05-17 | 2022-08-26 | 福州大学 | Sample forming device for curve fiber drawing test and sample preparation method thereof |
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| CN114923751A (en) * | 2022-05-17 | 2022-08-19 | 福州大学 | Accurate positioning method for curve fiber sample forming device |
| CN114942167A (en) * | 2022-05-17 | 2022-08-26 | 福州大学 | Sample forming device for curve fiber drawing test and sample preparation method thereof |
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