CN110823803A - Method for testing bonding strength between 3D printing concrete layers - Google Patents
Method for testing bonding strength between 3D printing concrete layers Download PDFInfo
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- CN110823803A CN110823803A CN201911206075.4A CN201911206075A CN110823803A CN 110823803 A CN110823803 A CN 110823803A CN 201911206075 A CN201911206075 A CN 201911206075A CN 110823803 A CN110823803 A CN 110823803A
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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
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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
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Abstract
The invention relates to the field of 3D printed concrete, and discloses a method for testing bonding strength between 3D printed concrete layers, which comprises the following steps: s1: forming three layers of 3D printed concrete standard parts with two adjacent layers bonded with each other; s2: leveling each plane of the three-layer 3D printed concrete standard part; s3: measuring the area of two adjacent bonding surfaces of the three-layer 3D printed concrete standard component, recording the area as S, and measuring the mass as m; s4: measuring the force when the bonding surface of one layer of concrete both sides breaks in the middle of the three-layer 3D printed concrete standard component is F, then the bonding strength between the three-layer 3D printed concrete standard component layers is: (F + mg/3)/2S. The method can simply and accurately test the interlayer bonding strength of the 3D printed concrete, and solves the problem that the interlayer bonding strength of the 3D printed concrete is not accurately tested.
Description
Technical Field
The invention relates to the field of 3D printed concrete, in particular to a method for testing bonding strength between 3D printed concrete layers.
Background
The 3D concrete printing process enables the realization of a special-shaped concrete structure and an irregular concrete structure to be possible, and simultaneously enables the concrete structure to be more attractive. However, the bonding force between layers of the 3D printed concrete is weak, so the level of the bonding strength between the layers determines the level of the service life of the 3D printed concrete. However, the surface of the 3D printed concrete is quite rough due to the forming mode of the 3D printed concrete, and sizes of concrete layers are different, so that great difficulty is caused in testing the bonding strength between the 3D printed concrete layers.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides the method for testing the bonding strength between the 3D printed concrete layers, which can simply and accurately test the bonding strength between the 3D printed concrete layers and solve the problem of inaccurate test of the bonding strength between the 3D printed concrete layers.
The technical scheme is as follows: the invention provides a method for testing bonding strength between 3D printed concrete layers, which comprises the following steps: s1: forming three layers of 3D printed concrete standard parts with two adjacent layers bonded with each other; s2: leveling each plane of the three-layer 3D printed concrete standard part; s3: measuring the area of two adjacent bonding surfaces of the three-layer 3D printed concrete standard component, recording the area as S, and measuring the mass as m; s4: measuring the force when the bonding surface of one layer of concrete both sides breaks in the middle of the three-layer 3D printed concrete standard component is F, then the bonding strength between the three-layer 3D printed concrete standard component layers is: (F + mg/3)/2S.
Preferably, in the S2, the planes of the three-layer 3D printed concrete standard are leveled using the same strength plaster. The three-layer 3D printing concrete standard component is leveled, so that each plane of the standard component is smooth, the force accuracy in the process of subsequently testing the fracture of the bonding surface can be improved, and the testing precision of the bonding strength between the layers of the standard component is improved.
Further, after the step S2 and before the step S3, the method further comprises the following steps: and jointing and maintaining the joints of the layers of the three-layer 3D printed concrete standard component. Because follow-up needs fix the standard component on bonding strength test positioner, and need be located the coplanar with two bonding surfaces of two adjacent layers of concrete respectively in the standard component with two pressure-bearing base's relative inner wall during the location, carry out pointing maintenance processing to each layer junction of standard component this moment, be convenient for clearly distinguish two bonding surfaces of standard component, be convenient for align two bonding surfaces with two pressure-bearing base's relative inner wall, the accuracy of the power when improving follow-up test bonding surface fracture, and then improved the test accuracy of bonding strength between the standard component layer.
Preferably, in S4, the three-layer 3D printed concrete standard is fixed by using a bonding strength testing and positioning device, and then the F is measured by using a universal testing machine.
Furthermore, the bonding strength testing and positioning device comprises a bottom plate, a pair of pressure-bearing bases which are symmetrically arranged is arranged on the bottom plate, the opposite inner sides of the two pressure-bearing bases are respectively and vertically connected with an upper pressure plate in a sliding manner, the upper pressure plate is also in threaded through connection with an adjusting screw rod, and the adjusting screw rod is in threaded connection with a threaded hole in the pressure-bearing base after penetrating through the upper pressure plate; the middle layer of concrete of the three-layer 3D printed concrete standard part is located between the pressure-bearing bases on two sides, the two layers of concrete on the two sides are located between the upper pressing plate and the pressure-bearing bases on the two sides respectively, and two bonding surfaces of the two adjacent layers of concrete are located in the same plane with the inner side walls, opposite to the two pressure-bearing bases, of the two adjacent layers of concrete respectively.
Preferably, a transverse slide rail is fixed on the bottom plate, and at least one of the two pressure-bearing bases is transversely connected to the slide rail in a sliding manner. After the design like this for bonding strength test positioner can be applicable to the test that different sizes's three-layer 3D printed the concrete standard component, also is convenient for adjust the position of three-layer 3D printed the concrete standard component on the pressure-bearing base.
Furthermore, rubber pads are respectively fixed on the lower surfaces of the two upper pressure plates. The setting of rubber pad can play the cushioning effect when the top board compresses tightly three-layer 3D and prints the concrete standard component, prevents to damage the standard component.
Has the advantages that: according to the testing method, the three layers of the 3D printed concrete standard parts with two adjacent layers bonded with each other are directly formed, the leveling treatment is carried out on each plane of the standard parts, then the interlayer bonding strength test is carried out, and compared with the method in the prior art that a sample needs to be cut from a 3D printed component for testing, the testing precision is higher, and the testing method is simpler and more convenient.
Drawings
Fig. 1 is a schematic plan view of a bonding strength test positioning device in embodiment 1;
fig. 2 is a schematic plan view of the positioning device for adhesion strength test in embodiment 2.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The embodiment provides a method for testing bonding strength between 3D printed concrete layers, which comprises the following specific testing steps:
1) forming three layers of 3D printed concrete standard parts with two adjacent layers bonded with each other;
2) leveling each plane of the three-layer 3D printed concrete standard part by using gypsum with the same strength;
3) jointing the joints of all layers of the three-layer 3D printed concrete standard component, maintaining for 24h, measuring the area of two adjacent bonding surfaces of the three-layer 3D printed concrete standard component, recording the area as S, weighing the area as m, and recording the mass as m;
4) use bonding strength test positioner earlier to print concrete standard component three-layer 3D and fix, use universal tester to measure the power when the bonding surface fracture of a layer of concrete both sides in the middle of the concrete standard component is printed to three-layer 3D again, record as F, then bonding strength between the layer of concrete standard component is printed to three-layer 3D: (F + mg/3)/2S.
In the step (4), as shown in fig. 1, the bonding strength testing and positioning device mainly comprises a bottom plate 1, a pair of pressure-bearing bases 2, a pair of adjusting screws 22 and a pair of upper pressing plates 21, wherein the pair of pressure-bearing bases 2 are symmetrically and fixedly installed on the bottom plate 1, the opposite inner sides of the upper parts of the two pressure-bearing bases 2 are respectively vertically and slidably connected with one upper pressing plate 21, and rubber pads 23 are respectively fixed on the lower surfaces of the two upper pressing plates 21; the two upper pressing plates 21 are respectively in threaded through connection with adjusting screws 22 which are perpendicular to the upper pressing plates 21, and the two adjusting screws 22 are respectively in threaded through connection with threaded holes in the pressure-bearing base 2 below after penetrating through the corresponding upper pressing plates 21 and the corresponding rubber pads 23.
When the three-layer 3D printed concrete standard component 3 is fixedly positioned by using the bonding strength testing and positioning device, firstly, the two sides of the concrete 32 of the three-layer 3D printed concrete standard component 3 are respectively arranged on the platforms of the pressure-bearing bases 2 at the two sides, at the moment, the two layers of concrete layers 32 at the two sides of the three-layer 3D printed concrete standard component 3 are respectively arranged between the upper pressing plate 21 and the platforms of the pressure-bearing bases 2, and the middle layer of concrete 31 is arranged between the pressure-bearing bases 2 at the two sides. The positions of the three-layer 3D printed concrete standard parts 3 on the two side bearing bases 2 are adjusted, so that the two bonding surfaces 33 of the two adjacent layers of concrete 32 are respectively positioned in the same plane with the lower opposite inner side walls 24 of the two bearing bases 2, that is, the two bonding surfaces 33 of the three-layer 3D printed concrete standard parts 3 are aligned with the lower opposite inner side walls of the two side bearing bases 2. Then, the adjusting bolts 22 on the two sides are respectively screwed clockwise to drive the two upper press plates 21 to press down until the three layers of 3D printed concrete standard parts 3 below are pressed tightly on the platforms of the pressure-bearing bases 2 on the two sides, as shown in fig. 2. After the positioning, a universal testing machine is used for applying pressure to the middle layer of concrete 31 of the three-layer 3D printed concrete standard component 3 from top to bottom until the middle layer of concrete 31 is broken from the two side bonding surfaces 33, and the force when the two side bonding surfaces 33 are broken is recorded as F.
Embodiment 2:
the embodiment is a further improvement of the embodiment 1, and the main improvement is that in the bonding strength testing and positioning device in the embodiment 1, two pressure-bearing bases 2 are fixedly mounted on a bottom plate 1, so that the bonding strength testing and positioning device can only be applied to testing and positioning of three-layer 3D printed concrete standard parts 3 of one size, and the application range is narrow. In the bonding strength testing and positioning device in the present embodiment, as shown in fig. 2, a transverse slide rail 4 is further fixed on the bottom plate 1, one of the two pressure-bearing bases 2 is slidably connected to the slide rail 4, the position of the three-layer 3D printed concrete standard component 3 on the pressure-bearing base 2 can be adjusted by adjusting the position of the pressure-bearing base 2 on the slide rail 4, after the adjustment, the pressure-bearing base 2 can be clamped and positioned on the slide rail 4 by the left and right positioning blocks 5, and then the subsequent testing can be performed in the same manner as in embodiment 1.
Otherwise, this embodiment is identical to embodiment 1, and will not be described herein.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (7)
1. A test method for bonding strength between 3D printed concrete layers is characterized by comprising the following steps:
s1: forming three layers of 3D printed concrete standard parts with two adjacent layers bonded with each other;
s2: leveling each plane of the three-layer 3D printed concrete standard part;
s3: measuring the area of two adjacent bonding surfaces of the three-layer 3D printed concrete standard component, recording the area as S, and measuring the mass as m;
s4: measuring the force when the bonding surface of one layer of concrete both sides breaks in the middle of the three-layer 3D printed concrete standard component is F, then the bonding strength between the three-layer 3D printed concrete standard component layers is: (F + mg/3)/2S.
2. The method for testing bonding strength between 3D printed concrete layers according to claim 1, wherein in the S2, the three 3D printed concrete standards are leveled with gypsum having the same strength.
3. The method for testing the bonding strength between 3D printed concrete layers as claimed in claim 1, further comprising the following steps after S2 and before S3: and jointing and maintaining the joints of the layers of the three-layer 3D printed concrete standard component.
4. The method for testing the bonding strength between 3D printed concrete layers as claimed in any one of claims 1 to 3, wherein in the step S4, the three-layer 3D printed concrete standard is fixed by using a bonding strength testing and positioning device, and then the F is measured by using a universal testing machine.
5. The method for testing the bonding strength between the 3D printing concrete layers according to claim 4, wherein the bonding strength testing and positioning device comprises a bottom plate (1), a pair of pressure-bearing bases (2) which are symmetrically installed are arranged on the bottom plate (1), the opposite inner sides of the two pressure-bearing bases (2) are respectively vertically and slidably connected with an upper pressure plate (21), an adjusting screw rod (22) is further in threaded through connection with the upper pressure plate (21), and the adjusting screw rod (22) is in threaded connection with a threaded hole in the pressure-bearing base (2) after penetrating through the upper pressure plate (21); the middle layer of concrete (31) of the three-layer 3D printed concrete standard component (3) is located between the two pressure-bearing bases (2), the two layers of concrete (32) on the two sides are located between the upper pressing plate (21) and the pressure-bearing bases (2) on the two sides respectively, and two bonding surfaces (33) of the two adjacent layers of concrete (32) are located in the same plane with the opposite inner side walls (24) of the two pressure-bearing bases (2) respectively.
6. The method for testing the bonding strength between the 3D printed concrete layers according to claim 5, wherein a transverse sliding rail (4) is fixed on the bottom plate (1), and at least one of the two pressure-bearing bases (2) is transversely connected to the sliding rail (4) in a sliding manner.
7. The method for testing the bonding strength between the 3D printing concrete layers as claimed in claim 5 or 6, wherein rubber pads (23) are further fixed on the lower surfaces of the two upper pressing plates (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911206075.4A CN110823803A (en) | 2019-11-29 | 2019-11-29 | Method for testing bonding strength between 3D printing concrete layers |
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| CN201911206075.4A CN110823803A (en) | 2019-11-29 | 2019-11-29 | Method for testing bonding strength between 3D printing concrete layers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| 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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