CN210401173U - Experimental mould subassembly of bonding strength between 3D printing concrete layer - Google Patents
Experimental mould subassembly of bonding strength between 3D printing concrete layer Download PDFInfo
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- CN210401173U CN210401173U CN201920391260.4U CN201920391260U CN210401173U CN 210401173 U CN210401173 U CN 210401173U CN 201920391260 U CN201920391260 U CN 201920391260U CN 210401173 U CN210401173 U CN 210401173U
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- steel plate
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- printing
- concrete
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- 238000010146 3D printing Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- 239000003292 glue Substances 0.000 claims abstract description 13
- 239000011229 interlayer Substances 0.000 claims abstract description 12
- 238000007639 printing Methods 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 28
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 238000009864 tensile test Methods 0.000 claims description 6
- 150000001252 acrylic acid derivatives Chemical class 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000002474 experimental method Methods 0.000 abstract description 2
- 238000012372 quality testing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A3D printing concrete inter-layer bonding strength test die assembly is connected with a tensile force testing device and comprises two opposite bonding ends, each bonding end consists of a steel plate die, a hinge moving part and a connecting arm, the hinge moving part comprises U-shaped steel, a bolt and a fixing nut, the U-shaped steel is hung on the connecting arm, and the bolt penetrates through two supporting legs of the U-shaped steel and then the tail end of the bolt is provided with the fixing nut to realize fastening; the steel plate dies at the two bonding ends are arranged oppositely, a placing area of a test specimen is formed in the middle, and the inner side surface of the steel plate die is bonded and fixed with the surface of the test specimen through bonding glue. The universal testing machine of the utility model is movably connected with the steel plate mould by a hinge, thereby effectively avoiding the influence of the shaft pulling eccentricity caused by a rigid fixed connection mode; simple structure, use portably, the sample is easily prepared, does not need special forming die, can extensively be used for concrete 3D printing material experiment, the quality testing of the building that concrete 3D printed, the detection of printed part article and view component etc..
Description
Technical Field
The utility model relates to an interlayer bonding strength test technical field, concretely relates to 3D prints experimental mould subassembly of bonding strength between concrete layer.
Background
The 3D printing building is built in a layer-by-layer superposition mode of printing materials, so whether the bonding performance between printing layers is good or not directly influences the integrity of the materials and the safety of the printing building. The concrete is a material with higher elastic modulus and lower tensile strength, for example, the tensile strength of common concrete is only 1-4 MPa, and the tensile stress generated is usually greater than that of the concrete in the age as long as a little shrinkage occurs under the constrained condition, so that the concrete cracks.
At present, a traditional concrete test tensile strength test piece must be prepared by customizing a special forming die, and then is matched with a special testing die for experimental test, the special forming method cannot be realized on the process of 3D printing layer-by-layer accumulation, so that no special testing die for the bonding strength between concrete 3D printing layers exists at present.
SUMMERY OF THE UTILITY MODEL
In order to be more convenient to the detection and the quality affirmation of the printing quality of 3D printing component, building, the utility model provides a 3D prints experimental mould subassembly of bonding strength between concrete layer adopts and prints the entity mould that cuts sample and simple easy-to-use to utilize the tensile method test of unipolar to print the cracked tensile stress value between the layer, detect and confirm the successive layer and print the bonding strength between the superimposed concrete layer.
The utility model provides a technical scheme that prior art problem adopted is:
the utility model provides a 3D prints experimental mould subassembly of cohesive strength between concrete layer, is connected with tensile test equipment, its characterized in that: the device comprises two bonding ends which are oppositely arranged, wherein each bonding end consists of a steel plate die, a hinge moving part and a connecting arm, one end of the hinge moving part is connected with the connecting arm, the other end of the hinge moving part is connected with the steel plate die, and the connecting arm is connected with a tensile force testing device; the steel plate dies at the two bonding ends are arranged oppositely, a placing area of the test specimen is formed in the middle, and the inner side surface of each steel plate die is bonded and fixed with the surface of the test specimen through bonding glue.
As the utility model discloses a preferred technical scheme, the hinge moving part includes U-shaped steel, bolt and fixation nut, the U-shaped steel articulates on the linking arm, and it is equipped with bolt preformed hole to correspond on two landing legs of U-shaped steel, the bolt passes two bolt preformed hole back tail ends and establishes fixation nut and realize the fastening.
Further preferably, the one end that the linking arm is close to the hinge moving part is equipped with and connects otic placode one, the steel sheet mould is close to a side surface of hinge moving part and is equipped with and connects otic placode two, the one end of hinge moving part is connected with the linking arm through connecting otic placode one, and the other end is connected with the steel sheet mould through connecting otic placode two.
Preferably, the test specimen is a cuboid structure cut from the 3D printed concrete member, the size of the upper surface and the lower surface of the test specimen is smaller than that of the steel plate die, the test specimen is composed of a plurality of printed layers, and the extending direction between the bonded layers is parallel to the plane where the steel plate die is located.
Further preferably, the number of printing layers in the test piece is at least 4.
Further preferably, the tensile testing equipment is a universal testing machine; the bonding glue is an epoxy resin or modified acrylate AB glue with a tensile-shear strength of more than 20MPa and a high-performance structure.
Preferably, the steel plate die is a steel plate with the thickness of 5-10 mm.
More preferably, the joint edge of the test specimen is also provided with an adhesive to be adhered to the inner side surface of the steel plate die.
Compared with the prior art, the utility model discloses a technical advantage lies in:
the utility model has simple structure and convenient use, and the universal tester and the steel plate die are movably connected by a hinge, thereby effectively avoiding the influence of the shaft pulling eccentricity caused by a rigid fixed connection mode; the sample is easy to prepare, does not need a special forming die, and can be widely used for concrete 3D printing material experiments, quality detection of buildings printed by concrete 3D, detection of printed parts, landscape members and the like.
Drawings
The above and/or other aspects and advantages of the present invention will become more apparent and more readily appreciated from the detailed description taken in conjunction with the following drawings, which are given by way of illustration only and not by way of limitation, wherein:
fig. 1 is a schematic view of the overall structure of a mold assembly according to the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of the reinforced bonding of the bonding adhesive and the test piece according to the present invention;
FIG. 4 is a schematic view of a die assembly for drawing and breaking in accordance with the present invention;
fig. 5 is a schematic diagram of cutting and extracting the die assembly according to the present invention.
Reference numerals: 1-connecting arm, 2-connecting lug plate I, 3-hinge moving part, 3.1-U-shaped steel, 3.2-bolt, 3.3-fixing nut, 4-steel plate mould, 5-connecting lug plate II, 6-bonding glue, 7-3D printing concrete member, 8-test piece and 9-bonding layer.
Detailed Description
Hereinafter, an embodiment of a 3D printing concrete inter-layer bond strength test mold assembly of the present invention will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the present invention, and are intended to be illustrative of the concepts of the present invention, which are intended to be illustrative and exemplary, and should not be construed as limiting the scope of the embodiments of the present invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of the respective portions and the mutual relationships thereof. It should be noted that for the sake of clarity in showing the structures of the various components of the embodiments of the present invention, the drawings are not drawn to the same scale. Like reference numerals are used to denote like parts.
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention. Like figure 1 and figure 2, the experimental mould subassembly of adhesive strength between 3D printing concrete layer is connected with tensile test equipment, its characterized in that: the device comprises two bonding ends which are oppositely arranged, wherein each bonding end consists of a steel plate die 4, a hinge moving part 3 and a connecting arm 1, one end of the hinge moving part 3 is connected with the connecting arm 1, the other end of the hinge moving part is connected with the steel plate die 4, and the connecting arm 1 is connected with a tensile force testing device; hinge moving part 3 includes U-shaped steel 3.1, bolt 3.2 and fixation nut 3.3, and U-shaped steel 3.1 articulates on linking arm 1, and the correspondence is equipped with bolt preformed hole on two landing legs of U-shaped steel 3.1, and the tail end is established fixation nut 3.3 and is realized the fastening after bolt 3.2 passes two bolt preformed holes. One end of the connecting arm 1 close to the hinge moving part 3 is provided with a first connecting lug plate 2, one side surface of the steel plate die 4 close to the hinge moving part 3 is provided with a second connecting lug plate 5, one end of the hinge moving part 3 is connected with the connecting arm 1 through the first connecting lug plate 2, and the other end of the hinge moving part is connected with the steel plate die 4 through the second connecting lug plate 5.
The steel plate die 4 is a steel plate with the thickness of 5-10 mm. As shown in fig. 3 and 4, the steel plate dies 4 at the two bonding ends are arranged oppositely, a placing area of the test piece 8 is formed in the middle, and the inner side surface of the steel plate die 4 is bonded and fixed with the surface of the test piece 8 through bonding glue. In this embodiment, the tensile testing equipment is a universal testing machine; the adhesive 6 is high-strength AB adhesive with tensile shear strength of more than 20MPa, such as epoxy resin or modified acrylate, or high-strength structural adhesive meeting the tensile shear strength of more than the concrete. In addition, the joint edge of the test specimen 8 is also provided with an adhesive glue 6 which is adhered to the inner side surface of the steel plate die 4.
As shown in fig. 5, the test piece 8 is a rectangular parallelepiped structure cut from the 3D printed concrete member 7, has a size of its upper and lower surfaces smaller than the size of the steel plate mold 4, and is composed of a plurality of printed layers, and the extending direction of the bonding layer 9 is parallel to the plane of the steel plate mold 4. The number of printed layers in the test piece 8 was at least 4.
Test method has portably, the sample is easily prepared, does not need special forming die, can be in experimental study, and 3D prints wide application in the concrete engineering project quality testing.
During the use, intercept out the regular shape test piece that is less than upper and lower mould area through wall body or the component that from concrete 3D printed, will print concrete test piece and steel mould bonding and bond the reinforcement in test piece periphery extra with high strength structure glue. After the high-strength adhesive is completely hardened, the whole body formed by bonding the die and the test piece together is arranged in a universal testing machine to test and print the tensile stress N of the concrete interlaminar fracture, and then the damaged test piece is taken down to measure the area A of the fracture surface, so that the bonding strength F = N/A between the 3D printed concrete layers is obtained. The method specifically comprises the following steps:
step one, printing a 3D printed concrete member 7 with a certain width and thickness by using mortar or concrete, cutting and cutting a square with parallel upper and lower surfaces from the 3D printed concrete member 7 after the 3D printed concrete member is maintained for 28 days, wherein the height of the test piece 8 is not less than 4 layers of printed layers, and the size of the test piece can be flexibly manufactured according to the printed width and the single-layer thickness of the printed member without being limited by a test piece forming mold under the condition that the test piece 8 is regular in size and parallel to the upper and lower surfaces.
And step two, the die assembly comprises two bonding ends, each bonding end consists of a steel plate die 4, a hinge moving part 3 and a connecting arm 1, the steel plate die 4 and the connecting arm 1 are connected through the hinge moving part 3, and the bonding ends are respectively arranged on the upper surface and the lower surface of the test piece during test.
And step three, cleaning the upper surface and the lower surface of the intercepted test piece 8, bonding the test piece with the steel plate die 4 by using bonding glue 6, and reinforcing and bonding the joint edge of the steel plate die 4 and the test piece 8 by using the bonding glue 6 in order to prevent the test piece from breaking and breaking from the bonded surface.
And step four, connecting the bonded test specimen 8 and the steel plate die 4 with a universal testing machine, starting the testing machine to apply drawing force to the test specimen at the speed of (250 +/-50) N/s until the test specimen 8 is broken from the weak part between the printing layers 9.
Step five, measuring the fracture area A of the test piece damaged from the printing interlayer 9, and calculating the interlayer bonding strength to be 0.1 MPa according to the following formula: f = L/A; in the formula, the bonding strength between F-printing layers is MPa; l-tension, N; a-bond area, mm.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. The utility model provides a 3D prints experimental mould subassembly of cohesive strength between concrete layer, is connected with tensile test equipment, its characterized in that: the device comprises two bonding ends which are oppositely arranged, wherein each bonding end consists of a steel plate die (4), a hinge moving part (3) and a connecting arm (1), one end of the hinge moving part (3) is connected with the connecting arm (1), the other end of the hinge moving part is connected with the steel plate die (4), and the connecting arm (1) is connected with a tensile force testing device; the steel plate moulds (4) at the two bonding ends are arranged oppositely, a placing area of the test piece (8) is formed in the middle, and the inner side surface of each steel plate mould (4) is bonded and fixed with the surface of the test piece (8) through bonding glue.
2. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 1, characterized in that: hinge moving part (3) include U-shaped steel (3.1), bolt (3.2) and fixation nut (3.3), U-shaped steel (3.1) articulate on linking arm (1), and the correspondence is equipped with bolt preformed hole on two landing legs of U-shaped steel (3.1), bolt (3.2) pass behind two bolt preformed holes the tail end establish fixation nut (3.3) and realize the fastening.
3. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 1, characterized in that: one end that linking arm (1) is close to hinge moving part (3) is equipped with connection otic placode (2), a side surface that steel sheet mould (4) are close to hinge moving part (3) is equipped with and connects otic placode two (5), the one end of hinge moving part (3) is connected with linking arm (1) through connecting otic placode (2), and the other end is connected with steel sheet mould (4) through connecting otic placode two (5).
4. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 1, characterized in that: the test specimen (8) is a cuboid structure cut from the 3D printed concrete member (7), the size of the upper surface and the lower surface of the test specimen is smaller than that of the steel plate die (4), the test specimen is composed of a plurality of printing layers, and the extending direction of the bonding layers (9) is parallel to the plane of the steel plate die (4).
5. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 4, characterized in that: the number of printing layers in the test piece (8) is at least 4.
6. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 1, characterized in that: the tensile testing equipment is a universal testing machine; the bonding glue (6) is an epoxy resin or modified acrylate AB glue with a high-performance structure and tensile-shear strength of more than 20 MPa.
7. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 1, characterized in that: the steel plate die (4) is a steel plate with the thickness of 5-10 mm.
8. The 3D printing concrete inter-layer bonding strength test mold assembly according to claim 1, characterized in that: and the joint edge of the test specimen (8) is also provided with an adhesive (6) which is adhered to the inner side surface of the steel plate die (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920391260.4U CN210401173U (en) | 2019-03-26 | 2019-03-26 | Experimental mould subassembly of bonding strength between 3D printing concrete layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920391260.4U CN210401173U (en) | 2019-03-26 | 2019-03-26 | Experimental mould subassembly of bonding strength between 3D printing concrete layer |
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| Publication Number | Publication Date |
|---|---|
| CN210401173U true CN210401173U (en) | 2020-04-24 |
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| CN201920391260.4U Expired - Fee Related CN210401173U (en) | 2019-03-26 | 2019-03-26 | Experimental mould subassembly of bonding strength between 3D printing concrete layer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766202A (en) * | 2020-08-17 | 2020-10-13 | 吉林大学 | Multi-test-piece bonding joint tension-compression fatigue test device considering temperature influence |
| CN114563345A (en) * | 2022-03-31 | 2022-05-31 | 中交第一公路勘察设计研究院有限公司 | Device and method for testing interlayer bonding strength of cement-based 3D printing test piece |
-
2019
- 2019-03-26 CN CN201920391260.4U patent/CN210401173U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766202A (en) * | 2020-08-17 | 2020-10-13 | 吉林大学 | Multi-test-piece bonding joint tension-compression fatigue test device considering temperature influence |
| CN111766202B (en) * | 2020-08-17 | 2021-10-01 | 吉林大学 | Multi-test-piece bonding joint tension-compression fatigue test device considering temperature influence |
| CN114563345A (en) * | 2022-03-31 | 2022-05-31 | 中交第一公路勘察设计研究院有限公司 | Device and method for testing interlayer bonding strength of cement-based 3D printing test piece |
| CN114563345B (en) * | 2022-03-31 | 2024-05-31 | 中交第一公路勘察设计研究院有限公司 | Device and method for testing interlayer bonding strength of cement-based 3D printing test piece |
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Granted publication date: 20200424 |