Device for detecting durability of 3D printing concrete material containing plant nanofibers

Abstract

The utility model discloses a plant nanofiber-containing 3D printing concrete material durability detection device which comprises a machine table, a movable detection table arranged on the top surface of the machine table in a sliding manner, an L-shaped base fixed on the top surface of the machine table and positioned behind the movable detection table, and an electric cylinder fixed on the top of the L-shaped base, a piston rod is arranged at the free end of the electric cylinder, and the bottom end of the piston rod penetrates through the bottom of the L-shaped base and is connected with a detection pressing block. According to the utility model, the existing detection device is improved, and the movable detection table is designed, so that an operator can flexibly select and detect different areas of the same sample directly through the transverse movement of the detection table under the condition that a clamp and a concrete sample are not disassembled and assembled in the detection process, and the detection efficiency is improved. Therefore, performance differences of different areas in the 3D printing concrete material containing the plant nanofibers can be conveniently compared, the overall operation mode is simple, convenient and rapid, and the overall working efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of concrete testing technology, specifically relating to a 3D-printed concrete material durability testing device containing plant nanofibers. Background Technology

[0002] With the continuous advancement of materials science and the growing popularity of the concept of sustainable development, 3D-printed concrete materials containing plant nanofibers are gradually becoming a research hotspot in the construction field as a new type of green building material. These materials cleverly integrate plant nanofibers (such as cellulose nanofibers, CNFs) into 3D-printed concrete, which not only significantly improves the mechanical properties and biocompatibility of the materials, but also enhances the compressive strength, flexural strength and other mechanical properties of concrete. They also greatly reduce the dependence on traditional cement and other high-energy-consuming and high-carbon-emission materials, opening up new avenues for achieving low-carbon and environmentally friendly building practices.

[0003] Plant-based nanofiber-containing 3D-printed concrete materials exhibit excellent mechanical properties, particularly in compressive strength, thanks to their unique microstructure and the reinforcing effect of nanofibers. However, the durability of this novel material, especially its long-term load-bearing capacity and adaptability to complex environmental conditions, is a key indicator for evaluating its widespread application in practical engineering construction. Durability testing of plant-based nanofiber-containing 3D-printed concrete materials includes compressive strength testing, flowability and printability testing, environmental weather resistance testing, and microscopic testing. Among these durability tests, compressive strength testing is an indispensable part of ensuring material quality, verifying design parameters, and optimizing material formulations. Furthermore, the durability testing of plant-based nanofiber-containing 3D-printed concrete materials requires the use of a specific type of... The concrete compressive strength testing device, such as the "a concrete durability testing device for building and civil engineering" disclosed in the existing patent with publication number CN210401061U, includes a device body, a support frame is provided at the upper end of the device body, a telescopic rod is provided through the upper end of the support frame, a connecting block is provided on the lower outer surface of the telescopic rod, a pressure plate is provided at the lower end of the connecting block, and fixing screw holes are provided on one side of the outer surface of the connecting block and one side of the outer surface of the pressure plate. It can be seen that the device described in this application is a common concrete durability testing device, which mainly relies on the electric telescopic rod to drive the pressure block to squeeze the concrete sample, thereby realizing the compressive strength testing of the concrete sample, and in turn judging the long-term load-bearing capacity and adaptability to complex environmental conditions of 3D printed concrete materials containing plant nanofibers.

[0004] Existing testing devices require placing the concrete sample on a testing platform and fixing it with two clamps. However, most testing platforms are fixed structures. When operators want to conduct compressive strength tests on other areas of the same concrete sample to analyze the specific impact of factors such as plant nanofiber distribution and printing path on the overall mechanical properties of the material, they must first remove the clamps, adjust the position of the concrete sample, and then fix it with the clamps again before testing other parts of the concrete sample. The whole process is quite cumbersome. In addition, repeatedly fixing the sample with clamps may also damage the sample. Therefore, this invention proposes a durability testing device for 3D printed concrete materials containing plant nanofibers. Utility Model Content

[0005] The purpose of this invention is to provide a durability testing device for 3D printed concrete materials containing plant nanofibers, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a durability testing device for 3D-printed concrete materials containing plant nanofibers, comprising...

[0007] The machine includes a movable testing platform that slides on the top surface of the machine, an L-shaped base fixed on the top surface of the machine and located behind the movable testing platform, and an electric cylinder fixed on the top of the L-shaped base. The free end of the electric cylinder is provided with a piston rod, the bottom end of which extends through to the bottom of the L-shaped base and is connected to a testing block. A concrete sample containing plant nanofibers is placed at the top center of the movable testing platform, and two clamping assemblies for holding the concrete sample containing plant nanofibers are provided on the top of the movable testing platform.

[0008] A quick-stop structure is also provided between the movable testing station and the machine.

[0009] Preferably, a T-shaped base is fixed at the bottom center of the movable testing platform, and a T-shaped groove is provided on the top surface of the platform, with the T-shaped base sliding within the T-shaped groove.

[0010] Preferably, the quick-positioning structure includes a movable base plate movably mounted on the front surface of the movable testing table, a movable base plate fixed on the bottom surface of the movable base plate and located directly in front of the machine, a positioning block fixed on the rear surface of the movable base plate, and multiple positioning slots corresponding to the positioning block opened on the front surface of the machine, the positioning block being engaged in one of the positioning slots.

[0011] Preferably, the quick-limiting structure further includes two guide rods symmetrically fixed on the front surface of the movable detection stage, and an end plate is fixed at the front end of the guide rod. The two ends of the movable base plate are respectively slidably sleeved on the two guide rods, and a spring is sleeved on the surface of each guide rod relative to the movable base plate and the end plate.

[0012] Preferably, both ends of the movable base plate are provided with rod holes that are adapted to the guide rod.

[0013] Preferably, a handle is fixed at the center of the front surface of the movable substrate.

[0014] Preferably, one end of the spring abuts against the front surface of the movable base plate, and the other end of the spring abuts against the rear surface of the end plate.

[0015] Preferably, the clamp assembly includes a support, a limiting strip, and fastening bolts. The support is fixed to the top surface of the movable testing table, and the limiting strip is fixed to the top surface of the support by the fastening bolts. One end of the limiting strip extends to the top of the concrete sample containing plant nanofibers, and a rubber pad is fixed to the bottom surface of the limiting strip. The rubber pad is pressed into contact with the concrete sample containing plant nanofibers.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model improves the existing testing device by designing a movable testing platform, which allows the operator to flexibly select and test different areas of the same sample by directly moving the testing platform laterally without disassembling the clamps and concrete sample. This facilitates the comparison of the performance differences of different areas in 3D printed concrete materials containing plant nanofibers. The overall operation is simple and quick, improving the overall work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This utility model Figure 1 A magnified view of a portion of region A in the middle;

[0019] Figure 3 This utility model Figure 1 A magnified view of a portion of region B in the middle;

[0020] In the diagram: 1. Machine base; 11. T-shaped slide; 2. Movable testing table; 3. L-shaped base; 41. Electric cylinder; 42. Piston rod; 43. Testing block; 5. Quick-release structure; 51. Movable base plate; 52. Movable bottom plate; 53. Limiting slot; 54. Handle; 55. Guide rod; 56. Spring; 57. End plate; 6. Fixture assembly; 61. Support; 62. Limiting strip; 63. Fastening bolt; 64. Rubber pad; 7. Concrete sample containing plant nanofibers. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example

[0023] Please see Figures 1 to 3 This is an embodiment of the present invention, which provides a technical solution: a durability testing device for 3D-printed concrete materials containing plant nanofibers, comprising...

[0024] Machine base 1, movable testing table 2 slidably set on the top surface of machine base 1, L-shaped base 3 welded and fixed to the top surface of machine base 1 and located behind movable testing table 2, electric cylinder 41 fixed to the top of L-shaped base 3 by multiple bolts, and piston rod 42 provided at the free end of electric cylinder 41, the bottom end of piston rod 42 penetrating to the bottom of L-shaped base 3 and connected to testing pressure block 43;

[0025] At the top center of the movable testing platform 2 is placed a concrete sample 7 containing plant nanofibers. This is a new type of building material made with plant nanofibers using 3D printing technology. The addition of plant nanofibers can significantly improve the mechanical properties of concrete, such as compressive strength, flexural strength, and tensile strength. These enhanced properties make the 3D-printed concrete structure more robust and durable. The added plant nanofibers can be cellulose nanofibers (CNF) and cellulose nanocrystals (CNC), which are nanoscale materials extracted from plant raw materials (such as corn stalks, wood pulp, algae, etc.). These fibers have the characteristics of being lightweight, renewable, biocompatible, and biodegradable, and also have the special physical, chemical, and mechanical properties of nanoparticles. When conducting durability testing on the concrete sample 7 containing plant nanofibers, the first test item is the compressive strength test to determine the mechanical properties of the concrete.

[0026] Furthermore, the top of the movable testing platform 2 is equipped with two clamping components 6 that hold the concrete sample 7 containing plant nanofibers. During subsequent testing, the electric cylinder 41 will start and drive the piston rod 42 to move the testing block 43 downward, causing the testing block 43 to perform compressive strength testing on the surface of the concrete sample 7 containing plant nanofibers, in order to determine the long-term load-bearing capacity of the 3D printed concrete material containing plant nanofibers and achieve durability testing.

[0027] A quick-stop structure 5 is also provided between the movable testing station 2 and the machine 1, which is used to stably limit the position of the movable testing station 2 during daily use, and at the same time facilitates the quick adjustment of the position of the movable testing station 2 in the future.

[0028] In this embodiment, preferably, a T-shaped base is welded and fixed at the bottom center of the movable testing platform 2, and a T-shaped groove 11 is provided on the top surface of the machine platform 1. The T-shaped base is slidably located in the T-shaped groove 11, so that the movable testing platform 2 can slide smoothly on the top of the machine platform 1, which facilitates the sliding adjustment of the position of the concrete sample 7 containing plant nanofibers.

[0029] In this embodiment, preferably, the quick-positioning structure 5 includes a movable base plate 51 movably mounted on the front surface of the movable testing table 2, and a movable base plate 52 welded and fixed to the bottom surface of the movable base plate 51 and located directly in front of the machine tool 1. A limiting block is welded and fixed to the rear surface of the movable base plate 52. The front surface of the machine tool 1 has multiple limiting slots 53 corresponding to the limiting block. The limiting block is engaged in one of the limiting slots 53 to achieve stable positioning of the movable testing table 2 during daily use. The quick-positioning structure 5 also includes two guide rods 55 symmetrically fixed to the front surface of the movable testing table 2, and an end plate 57 is fixed to the front end of the guide rods 55. The two ends of the movable base plate 51 are slidably sleeved on the two guide rods 55 respectively. A spring 56 is sleeved between the surface of each guide rod 55 and the movable base plate 51 and the end plate 57. Under the pushing of the spring 56, the movable base plate 51 is positioned to maintain stable positioning during daily use. The movable base plate 51 can be tightly attached to the front surface of the movable testing platform 2, thus ensuring that the limiting block on the rear surface of the movable base plate 52 can be stably locked in one of the limiting slots 53, ensuring the limiting stability of the movable testing platform 2. When it is necessary to adjust the position of the movable testing platform 2 and the plant nanofiber concrete sample 7, simply pull the movable base plate 51 forward, so that the spring 56 is gradually compressed, causing the movable base plate 52 and the limiting block on its back to move forward until the limiting block moves out of the limiting slot 53, which can quickly release the limitation on the movable testing platform 2. At this time, the movable testing platform 2 can be slid laterally on the top of the machine base 1 to quickly adjust the position of the plant nanofiber concrete sample 7, which is convenient for subsequent compressive strength testing of other areas on the surface of the plant nanofiber concrete sample 7, and convenient for comparing the performance differences of different areas in the 3D printed concrete material containing plant nanofibers.

[0030] In this embodiment, preferably, both ends of the movable substrate 51 are provided with rod holes that are adapted to the guide rod 55, so that both ends of the movable substrate 51 can be smoothly slidably sleeved on the guide rod 55.

[0031] In this embodiment, preferably, a handle 54 is welded and fixed at the center of the front surface of the movable substrate 51, so that the operator can pull the movable substrate 51 forward using the handle 54.

[0032] In this embodiment, preferably, one end of the spring 56 abuts against the front surface of the movable substrate 51, and the other end of the spring 56 abuts against the rear surface of the end plate 57.

[0033] In this embodiment, preferably, the clamping assembly 6 includes a support 61, a limiting pressure strip 62, and a fastening bolt 63. The support 61 is fixed to the top surface of the movable testing table 2, and the limiting pressure strip 62 is fixed to the top surface of the support 61 by the fastening bolt 63. One end of the limiting pressure strip 62 extends to the top of the concrete sample 7 containing plant nanofibers, and a rubber pad 64 is fixed to the bottom surface of the limiting pressure strip 62. The rubber pad 64 presses against the concrete sample 7 containing plant nanofibers, which can effectively clamp and fix the concrete sample 7 containing plant nanofibers. At the same time, the rubber pad 64 can prevent unnecessary damage to the concrete sample 7 containing plant nanofibers during the clamping process.

[0034] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A durability testing device for 3D-printed concrete materials containing plant nanofibers, characterized in that: include The machine (1), the movable testing table (2) which is slidably set on the top surface of the machine (1), the L-shaped base (3) which is fixed on the top surface of the machine (1) and located behind the movable testing table (2), the electric cylinder (41) which is fixed on the top of the L-shaped base (3), and the free end of the electric cylinder (41) is provided with a piston rod (42), the bottom end of the piston rod (42) extends through to the bottom of the L-shaped base (3) and is connected to a testing pressure block (43), a plant nanofiber concrete sample (7) is placed at the top center of the movable testing table (2), and two clamping assemblies (6) are provided on the top of the movable testing table (2) to clamp the plant nanofiber concrete sample (7); A quick-stop structure (5) is also provided between the movable testing station (2) and the machine (1).

2. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 1, characterized in that: A T-shaped base is fixed at the bottom center of the movable testing platform (2), and a T-shaped groove (11) is provided on the top surface of the machine platform (1), and the T-shaped base slides in the T-shaped groove (11).

3. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 1, characterized in that: The quick-positioning structure (5) includes a movable base plate (51) movably mounted on the front surface of the movable testing platform (2) and a movable base plate (52) fixed on the bottom surface of the movable base plate (51) and located in front of the machine platform (1). A positioning block is fixed on the rear surface of the movable base plate (52). The front surface of the machine platform (1) is provided with multiple positioning slots (53) corresponding to the positioning block. The positioning block is inserted into one of the positioning slots (53).

4. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 3, characterized in that: The quick-stop structure (5) also includes two guide rods (55) symmetrically fixed on the front surface of the movable detection stage (2), and the front end of the guide rod (55) is fixed with an end plate (57). The two ends of the movable base plate (51) are respectively slidably sleeved on the two guide rods (55), and a spring (56) is sleeved on the surface of each guide rod (55) between the movable base plate (51) and the end plate (57).

5. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 4, characterized in that: Both ends of the active base plate (51) are provided with rod holes that are compatible with the guide rod (55).

6. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 4, characterized in that: A handle (54) is fixed at the center of the front surface of the active base plate (51).

7. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 4, characterized in that: One end of the spring (56) abuts against the front surface of the movable base plate (51), and the other end of the spring (56) abuts against the rear surface of the end plate (57).

8. The durability testing device for 3D-printed concrete materials containing plant nanofibers according to claim 1, characterized in that: The clamp assembly (6) includes a support (61), a limiting strip (62), and a fastening bolt (63). The support (61) is fixed to the top surface of the movable testing table (2), and the limiting strip (62) is fixed to the top surface of the support (61) by the fastening bolt (63). One end of the limiting strip (62) extends to the top of the concrete sample (7) containing plant nanofibers, and a rubber pad (64) is fixed to the bottom surface of the limiting strip (62). The rubber pad (64) is pressed into contact with the concrete sample (7) containing plant nanofibers.

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