Method and device for testing spatial distribution of fibers in concrete

Abstract

The invention discloses a method and a device for testing spatial distribution of fibers in concrete, and belongs to the technical field of civil engineering materials. The method for testing the spatial distribution of the fibers in the concrete comprises the following steps: firstly, carrying out a rheological test on freshly mixed fiber-reinforced cement concrete to obtain rheological parameters of the tested fiber-reinforced cement concrete, and then adjusting parameters of a Carbomer solution and colored cullet to obtain a tested material of which the rheological parameters are close to those of the fiber-reinforced cement concrete. And then the tested material is added into the transparent container, so that the distribution and state of the fibers in the fiber reinforced cement concrete can be intuitively observed through the image acquired by the image acquisition module. According to the method and the device for testing the spatial distribution of the fibers in the concrete, the problem that the fiber state in the flowing state of the fiber reinforced cement concrete cannot be qualitatively analyzed by the existing test method is solved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering materials, and in particular to a method and a device for testing the spatial distribution of fibers in concrete. Background Art

[0002] Concrete is the most widely used artificial composite material in civil engineering. With the continuous development of the economy and the continuous improvement of science and technology, the performance requirements of concrete materials for high-rise and long-span structures are gradually increasing. Traditional concrete has gradually become difficult to meet the needs of modern large-scale engineering construction due to defects such as weak tensile strength and poor ductility. In terms of performance improvement, adding fibers as reinforcements to concrete to achieve modification is a common approach. At present, scientific researchers have basically reached a consensus that fiber reinforcement can improve the tensile properties and bending toughness of concrete. However, some studies have also shown that when other conditions remain unchanged, the addition of fibers to concrete will reduce the fluidity of concrete to a certain extent. Fibers sometimes "clump" and "ball" in concrete, which to a certain extent affects the later performance of concrete.

[0003] Simple slump and slump expansion tests can no longer describe the rheological properties of fiber-reinforced cement concrete well. At present, the measurement method of the rheological properties of fiber-reinforced cement concrete mainly includes two rheological parameters, namely, the yield stress and plastic viscosity of fiber-reinforced cement concrete, according to the concrete rheology theory proposed by Bingham. However, this method cannot intuitively express the state and distribution of fibers in fiber-reinforced cement concrete. The problems of "agglomeration" and "balling" of fibers in concrete are difficult to analyze and solve. It is difficult to reflect the true situation of the rheological properties of fiber-reinforced cement concrete, and it is difficult to study the mechanism of action between fibers and concrete. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and to provide a method and device for testing the spatial distribution of fibers in concrete, which overcomes the problem that the existing test methods cannot qualitatively analyze the fiber state of fiber-reinforced cement concrete in a flowing state.

[0005] The present invention provides a method for testing the spatial distribution of fibers in concrete, comprising:

[0006] S1: Perform rheological test on fresh fiber reinforced cement concrete to obtain rheological parameters of the tested fiber reinforced cement concrete;

[0007] S2: According to the rheological parameters of the fiber reinforced cement concrete in step S1, a Kambo solution with the same viscosity range as the fiber reinforced cement concrete is selected to replace the gel in the fiber reinforced cement concrete in step S1, and colored broken glass with different specifications is used to replace the gravel and sand in the fiber reinforced cement concrete in step S1. According to the viscosity of the fiber reinforced cement concrete in step S1, the viscosity of the Kambo solution with the corresponding viscosity is selected, and according to the weight and gradation of the gravel and sand in the fiber reinforced cement concrete in step S1, the colored broken glass with the same weight and gradation is selected;

[0008] S3: uniformly stir the kambo solution selected in step S2 and the colored broken glass, add the same fiber content as in the fiber reinforced cement concrete in step S1, then place it in a container and repeat step S1 to perform rheological test, compare the obtained rheological parameters with the rheological parameters of the fiber reinforced cement concrete in step S1, if the error between the two is within the set range, proceed to the next step, if the error between the two exceeds the set range, adjust the viscosity of the kambo solution and repeat step S2;

[0009] S4: the kambo solution selected in step S3 and the colored broken glass are uniformly mixed in proportion, and placed in a transparent container, and an image acquisition module is respectively arranged directly below and on one side of the transparent container to respectively acquire images of the side and bottom of the transparent container;

[0010] S5: testing the rheological parameters of the material to be tested in the transparent container;

[0011] S6: Compare the rheological parameters of the material under test in step S5 with the rheological parameters of the fiber reinforced cement concrete in step S1 for the second time. If the error between the two is within the set range, proceed to the next step. If the error between the two exceeds the set range, repeat steps S2 to S6 until the error is within the set range.

[0012] S7: Collect video data from two image acquisition modules, observe the distribution and state of the fibers in the measured material, and evaluate the spatial distribution of the fibers in the measured material.

[0013] Preferably, the error setting ranges in steps S3 and S6 are both less than or equal to 20%.

[0014] Preferably, in step S4, the kambo solution selected in step S3 and the colored broken glass are uniformly mixed in proportion, and placed in a transparent container, and it is checked whether the transparent container is in a horizontal state.

[0015] A testing device for the spatial distribution of fibers in concrete, based on the above-mentioned testing method for the spatial distribution of fibers in concrete, comprises:

[0016] The rheological test module comprises a rheometer body, a stirring motor and a stirring member, wherein the rheometer body is connected to an external computer, the stirring motor is connected to the lower end of the rheometer body, the stirring member is fixedly connected to the output shaft of the stirring motor through a rotating shaft and is located below the stirring motor, and the rheometer body is connected to a first lifting member to adjust the height of the rheometer body;

[0017] The transparent container is a reactor, which is used to contain the material to be tested and is arranged below the rheometer body. The reactor is made of transparent material;

[0018] Two image acquisition modules are respectively arranged on the side and bottom of the reaction kettle to respectively acquire images of the side and bottom of the reaction kettle.

[0019] Preferably, the reaction kettle and the image acquisition module located at the side of the reaction kettle are both connected to a second lifting member, so that the height of the reaction kettle and the image acquisition module located at the side of the reaction kettle can be adjusted by the second lifting member.

[0020] Preferably, the second lifting member includes two first electric telescopic rods and a first moving block, the two first electric telescopic rods are vertically arranged, the bottom ends of the two first electric telescopic rods are connected to a base, the image acquisition module located below the reactor is arranged on the top surface of the base, located between the two first electric telescopic rods, the two first electric telescopic rods are respectively connected to a first connecting rod, the opposite sides of the reactor are respectively connected to the two first connecting rods through a first fixing member, the first moving block is slidably connected to one of the first electric telescopic rods, and the image acquisition module located on the side of the reactor is connected to the first moving block.

[0021] Preferably, a plurality of threaded holes are provided on the top surface of the base, and threads are provided at the bottom ends of the two first electric telescopic rods, so that the first electric telescopic rods can be detachably connected to the threaded holes through the threads.

[0022] Preferably, the image acquisition module located below the reactor is connected to the top of a second movable block, and the bottom of the second movable block is provided with threads so that the second movable block can be detachably connected to the threaded hole through the threads, and each of the threaded holes is evenly distributed along a straight line in the horizontal direction.

[0023] Preferably, the first lifting member includes a second electric telescopic rod, the bottom end of the second electric telescopic rod is connected to a base, the top end is connected to a second connecting rod, and the second connecting rod is detachably connected to the rheometer body via a second fixing member.

[0024] Preferably, the reaction kettle is made of acrylic.

[0025] Compared with the prior art, the present invention has at least the following advantages:

[0026] The testing method for the spatial distribution of fibers in concrete of the present invention uses an existing rheometer to draw a shear stress-shear rate curve of fiber-reinforced cement concrete according to the force values ​​measured by a tension sensor at different rotation speeds, and obtains the rheological parameters corresponding to the required rheological model by fitting, and then obtains a tested material with rheological parameters close to those of the fiber-reinforced cement concrete by adjusting the parameters of a Kambo solution and colored broken glass, and then adds the tested material into a transparent container, and then the distribution and state of the fibers in the fiber-reinforced cement concrete can be intuitively observed through the image obtained by the image acquisition module, thereby overcoming the problem that the existing test method cannot qualitatively analyze the fiber state of the fiber-reinforced cement concrete in the flow state, and can intuitively and clearly understand the distribution and state of the used fibers in the fiber-reinforced cement concrete, providing a reference for evaluating the rheological properties of the fiber-reinforced cement concrete.

[0027] The present invention also provides a testing device for the spatial distribution of fibers in concrete, which is suitable for the testing method for the spatial distribution of fibers in concrete. The rheological testing module can facilitate rheological testing of the material to be tested and measure the rheological parameters of the material to be tested. By setting up a reactor, it is convenient to contain and stir the material to be tested, which is conducive to repeated rheological testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of a testing device for the spatial distribution of fibers in concrete according to the present invention;

[0029] Figure 2 This is a schematic diagram of a reactor for measuring the spatial distribution of fibers in fiber-reinforced cement concrete:

[0030] Figure 3 It is a schematic diagram of a base of a testing device for the spatial distribution of fibers in concrete according to the present invention.

[0031] Description of reference numerals:

[0032] 1. Base; 201. First electric telescopic rod; 202. Second electric telescopic rod; 501. Rheometer body; 502. Stirring motor; 503. Rotating shaft; 504. Stirring member; 6. Reactor; 701. First connecting rod; 702. Second connecting rod; 801. First fixing member; 802. Second fixing member; 901. First moving block; 902. Second moving block; 1001. First high-speed camera; 1002. Second high-speed camera; 12. Carbomer solution; 13. Colored broken glass; 14. Fiber. DETAILED DESCRIPTION

[0033] The following is combined with Figure 1 to Figure 3, the specific implementation of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The present invention provides a method for testing the spatial distribution of fibers in concrete, comprising the following steps:

[0035] S1: The freshly mixed fiber reinforced cement concrete to be tested is uniformly filled in a container, and a shear stress-shear rate curve is drawn using an existing rheometer according to the force values ​​measured by a tension sensor at different rotation speeds, and the rheological parameters corresponding to the required rheological model are obtained by fitting;

[0036] S2: According to the viscosity characteristics of the fiber reinforced cement concrete in step S1, a Kambo solution 12 with the same viscosity range as the fiber reinforced cement concrete is selected to replace the gel in the fiber reinforced cement concrete in step S1, and colored cullets 13 with different specifications are used to replace the gravel and sand in the fiber reinforced cement concrete in step S1. According to the viscosity of the fiber reinforced cement concrete in step S1, the dosage of the Kambo solution 12 with the corresponding viscosity is selected, and according to the weight and gradation of the gravel and sand in the fiber reinforced cement concrete in step S1, the colored cullets 13 with the same weight and gradation are selected;

[0037] S3: uniformly stir the selected kambo solution 12 and the colored broken glass 13, add the same amount of fiber 14 as in the fiber reinforced cement concrete in step S1, then place it in a container and repeat step S1 to perform rheological test, compare the obtained rheological parameters with the fiber reinforced cement concrete parameters in step S1, if the error between the two is less than or equal to 20%, proceed to the next step, if the error between the two is greater than 20%, adjust the viscosity of the kambo solution 12, and repeat step S2;

[0038] S4: the kambo solution 12 and the colored broken glass 13 selected in step S3 are uniformly mixed in proportion, and placed in a transparent container, and at the same time, it is checked whether the transparent container is in a horizontal state, and an image acquisition module is respectively arranged directly below and on one side of the transparent container to respectively acquire images of the side and bottom of the transparent container;

[0039] S5: stirring and testing the rheological parameters of the material in the transparent container by means of a rheological testing module, wherein the rheological testing module is connected to an external computer to display the obtained rheological parameters;

[0040] S6: Compare the rheological parameters in the external computer with the rheological parameters of the fiber reinforced cement concrete in step S1 for the second time. If the error is less than or equal to 20%, proceed to the next step. If the error is greater than 20%, repeat the above steps S2 to S6 until the parameters meet the requirements.

[0041] S7: Collect video data from two image acquisition modules, observe the distribution and state of the fibers 14 in the material being tested, and evaluate the spatial distribution of the fibers 14 in the material being tested.

[0042] The testing device for the spatial distribution of fibers in concrete provided by the present invention comprises a rheological testing module, a reactor 6 and two image acquisition modules. The rheological testing module comprises a rheometer body 501, a stirring motor 502 and a stirring member 504. The stirring motor 502 is connected to the lower end of the rheometer body 501. The stirring member 504 is fixedly connected to the output shaft of the stirring motor 502 through a rotating shaft 503 and is located below the stirring motor 502. The rheometer body 501 is connected to a first lifting member to adjust the height of the rheometer body 501. The reactor 6 is used to contain the material to be tested and is arranged below the rheometer body 501. The reactor 6 is made of transparent material. The two image acquisition modules are respectively a first high-speed camera 1001 and a second high-speed camera 1002. The first high-speed camera 1001 is arranged below the reactor 6, and the second high-speed camera 1002 is arranged on the side of the reactor 6 to respectively collect images of the side and bottom of the reactor 6 and the material to be tested therein.

[0043] By adopting the above technical scheme, the shear stress-shear rate curve of the fiber-reinforced cement concrete is plotted using an existing rheometer according to the force values ​​measured by the tension sensor at different rotation speeds, and the rheological parameters corresponding to the required rheological model are fitted, and then the material parameters are adjusted to obtain the material to be tested that is close to the rheological parameters of the fiber-reinforced cement concrete. The material to be tested is then added to a transparent reactor 6, and the stirring motor 502 installed on the rheometer body 501 in the rheological test module drives the stirring member 504 to stir the material to be tested in the reactor 6. The images obtained by the two image acquisition modules can be used to intuitively and clearly observe the distribution and state of the fibers 14 in the material to be tested, thereby obtaining the distribution and state of the fibers 14 in the fiber-reinforced cement concrete.

[0044] As a preferred embodiment, the reactor 6 and the second high-speed camera 1002 are both connected to a second lifting member, so that the height of the reactor 6 and the second high-speed camera 1002 can be adjusted by the second lifting member. By adjusting the height of the reactor 6 by the second lifting member, the bottom of the reactor 6 and the first high-speed camera 1001 can be adjusted to a suitable distance. In this way, imaging can be achieved by only appropriate fine-tuning of the first high-speed camera 1001. By adjusting the second high-speed camera 1002 by the second lifting member, the second high-speed camera 1002 can be located at a suitable position on the side of the reactor 6, which is convenient for imaging from the side of the reactor 6.

[0045] As a preferred embodiment, the second lifting member includes two first electric telescopic rods 201 and a first moving block 901, the two first electric telescopic rods 201 are both vertically arranged, the bottom ends of the two first electric telescopic rods 201 are connected to a base 1, the first high-speed camera 1001 is arranged on the top surface of the base 1, located between the two first electric telescopic rods 201, the two first electric telescopic rods 201 are respectively connected to a first connecting rod 701, the opposite sides of the reactor 6 are respectively connected to the two first connecting rods 701 by a first fixing member 801, the first fixing member 801 is a pair of buckle structures, and the buckle structure is used to realize the detachable connection between the reactor 6 and the two first connecting rods 701, the first moving block 901 is slidably connected to a first electric telescopic rod 201, specifically, a slide groove can be provided on the movable end surface of the first electric telescopic rod 201 along its longitudinal direction, and the first moving block 901 is slidably connected to the first electric telescopic rod 201. The movable block 901 is slidably connected to the first electric telescopic rod 201 through a slide groove. The first movable block 901 is penetrated with a positioning bolt. The position of the first movable block 901 can be fixed by screwing the positioning bolt and making the positioning bolt tightly against the first electric telescopic rod 201. The second high-speed camera 1002 is fixedly installed on the first movable block 901. By adopting the above technical solution, the reactor 6 can be conveniently and firmly connected to the first connecting rod 701 through the two first fixing members 801. The structure is simple and the operation is convenient. The two first electric telescopic rods 201 can be extended and retracted at the same time to lift the reactor 6 to adjust the height of the reactor 6, the first movable block 901 and the second high-speed camera 1002. The height of the second high-speed camera 1002 can be fine-tuned by sliding the first movable block 901, so that the second high-speed camera 1002 can be moved to a suitable position more quickly.

[0046] As a preferred embodiment, a plurality of threaded holes 101 are provided on the top surface of the base 1, and threads are provided at the bottom ends of the two first electric telescopic rods 201, so that the first electric telescopic rods 201 can be detachably connected to the threaded holes 101 through threads, and the first electric telescopic rods 201 are installed on two threaded holes 101 with different intervals, so that reactors 6 of different sizes can be connected through the first fixing member 801 to accommodate materials of different volumes to be tested.

[0047] As a preferred embodiment, the first high-speed camera 1001 is fixedly mounted on the top of a second moving block 902, and the bottom of the second moving block 902 is provided with threads so that the second moving block 902 can be detachably connected to the threaded hole 101 through the threads, and the threaded holes 101 are evenly distributed along a straight line in the horizontal direction. The two first electric telescopic rods 201 are respectively installed on two threaded holes 101 with an odd interval, and the first high-speed camera 1001 is installed in the threaded hole 101 located in the center between the two first electric telescopic rods 201 through the second moving block 902. For example, the two first electric telescopic rods 201 are respectively installed with the first and fifth threaded holes 101, and the second moving block 902 is installed in the third threaded hole 101, so that the first high-speed camera 1001 is fixed at the central position below the reactor 6, so that the image of the bottom of the reactor 6 can be better collected.

[0048] As a preferred embodiment, the first lifting member includes a second electric telescopic rod 202, the bottom end of the second electric telescopic rod 202 is connected to a base 1, and the top end is connected to a second connecting rod 702. The second connecting rod 702 is detachably connected to the rheometer body 501 through a second fixing member 802. The second fixing member 802 can be a snap-on structure or a bolt structure, which detachably fixes the second connecting rod 702 to the rheometer body 501, thereby being able to replace different models of the rheometer body 501.

[0049] As a preferred embodiment, the reaction kettle 6 is made of transparent acrylic material, so that the present invention is more durable.

[0050] Directions:

[0051] S1: The freshly mixed fiber reinforced cement concrete to be tested is uniformly filled in a container, and a shear stress-shear rate curve is drawn using an existing rheometer according to the force values ​​measured by a tension sensor at different rotation speeds, and the rheological parameters corresponding to the required rheological model are obtained by fitting;

[0052] S2: According to the viscosity characteristics of the fiber reinforced cement concrete in step S1, a Kambo solution 12 with the same viscosity range as the fiber reinforced cement concrete is selected to replace the gel in the fiber reinforced cement concrete in step S1, and colored cullets 13 with different specifications are used to replace the gravel and sand in the fiber reinforced cement concrete in step S1. According to the viscosity of the fiber reinforced cement concrete in step S1, the dosage of the Kambo solution 12 with the corresponding viscosity is selected, and according to the weight and gradation of the gravel and sand in the fiber reinforced cement concrete in step S1, the colored cullets 13 with the same weight and gradation are selected;

[0053] S3: uniformly stir the selected kambo solution 12 and the colored broken glass 13, add the same amount of fiber 14 as in the fiber reinforced cement concrete in step S1, then place it in a container and repeat step S1 to perform rheological test, compare the obtained rheological parameters with the fiber reinforced cement concrete parameters in step S1, if the error between the two is less than or equal to 20%, proceed to the next step, if the error between the two is greater than 20%, adjust the viscosity of the kambo solution 12, and repeat step S2;

[0054] S4: The kambo solution 12 and the colored broken glass 13 selected in step S3 are uniformly mixed in proportion to prepare the tested material, and placed in the reactor 6, and the two first electric telescopic rods 201 are adjusted to a set height, and at the same time, the reactor 6 is checked to be in a horizontal state to ensure that the image of the first high-speed camera 1001 is circular, and the image of the second high-speed camera 1002 is not greatly offset;

[0055] S5: According to the height of the reaction kettle 6 in step S4, the height of the rheometer body 501 is adjusted by the first lifting member, and the height of the stirring member 504 changes accordingly, and the operation is stopped when the stirring member 504 is placed in the center of the reaction kettle 6;

[0056] S6: According to the test requirements, adjust the positions of the two image acquisition modules, and adjust the clarity and accuracy of the two image acquisition modules;

[0057] S7: Connect the rheometer body 501 to the external computer through a wire, and start the stirring motor 502 until the test is finished;

[0058] S8: Compare the rheological parameters in the external computer with the rheological parameters of the fiber reinforced cement concrete in step S1 for the second time. If the error is less than or equal to 20%, proceed to the next step. If the error is greater than 20%, repeat the above steps S2 to S8 until the parameters meet the requirements.

[0059] S9: Collect video data from two image acquisition modules, observe the distribution and state of the fibers 14 in the material under test, evaluate the spatial distribution of the fibers 14 in the material under test, and then qualitatively analyze the state of the fibers in the flow state of the fiber-reinforced cement concrete. The distribution and state of the fibers used in the fiber-reinforced cement concrete can be intuitively and clearly understood, providing a reference for evaluating the rheological properties of the fiber-reinforced cement concrete.

[0060] In the description of the present invention, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0061] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect" and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing the spatial distribution of fibers in concrete, characterized in that: The following steps are involved: S1: Perform rheological test on fresh fiber reinforced cement concrete to obtain rheological parameters of the tested fiber reinforced cement concrete; S2: According to the rheological parameters of the fiber reinforced cement concrete in step S1, a Kambo solution (12) having the same viscosity range as the fiber reinforced cement concrete is selected to replace the gel in the fiber reinforced cement concrete in step S1, and colored cullets (13) of different specifications are used to replace the gravel and sand in the fiber reinforced cement concrete in step S1; according to the viscosity of the fiber reinforced cement concrete in step S1, a corresponding viscosity of the Kambo solution (12) is selected; according to the weight and gradation of the gravel and sand in the fiber reinforced cement concrete in step S1, colored cullets (13) of the same weight and gradation are selected; S3: uniformly stir the kambo solution (12) and colored broken glass (13) selected in step S2, add the fiber (14) of the same specification as the fiber reinforced cement concrete in step S1, then place it in a container and repeat step S1 to perform rheological test, compare the obtained rheological parameters with the rheological parameters of the fiber reinforced cement concrete in step S1, and if the error between the two is within the set range, proceed to the next step; if the error between the two exceeds the set range, adjust the viscosity of the kambo solution (12) and repeat step S2; S4: the kambo solution (12) selected in step S3 and the colored broken glass (13) are uniformly mixed in proportion, and placed in a transparent container, and an image acquisition module is respectively arranged directly below and on one side of the transparent container to respectively acquire images of the side and bottom of the transparent container; S5: testing the rheological parameters of the material to be tested in the transparent container; S6: Compare the rheological parameters of the material under test in step S5 with the rheological parameters of the fiber reinforced cement concrete in step S1 for the second time. If the error between the two is within the set range, proceed to the next step. If the error between the two exceeds the set range, repeat steps S2 to S6 until the error is within the set range. S7: Collecting video data from two image acquisition modules, observing the distribution and state of the fibers (14) in the material being tested, and evaluating the spatial distribution of the fibers (14) in the material being tested.

2. The method for testing the spatial distribution of fibers in concrete according to claim 1, characterized in that: The setting range of the error in steps S3 and S6 is both less than or equal to 20%.

3. The method for testing the spatial distribution of fibers in concrete according to claim 1, characterized in that: In step S4, the kambo solution (12) selected in step S3 and the colored broken glass (13) are uniformly mixed according to a certain proportion, and placed in a transparent container, and it is checked whether the transparent container is in a horizontal state.

4. A testing device for the spatial distribution of fibers in concrete, based on the testing method for the spatial distribution of fibers in concrete according to claims 1 to 3, characterized in that: include: The rheological test module comprises a rheometer body (501), a stirring motor (502) and a stirring member (504), wherein the rheometer body (501) is connected to an external computer, the stirring motor (502) is connected to the lower end of the rheometer body (501), the stirring member (504) is fixedly connected to the output shaft of the stirring motor (502) through a rotating shaft (503), and is located below the stirring motor (502), and the rheometer body (501) is connected to a first lifting member to adjust the height of the rheometer body (501); The transparent container is a reaction kettle (6), which is used to contain the material to be tested and is arranged below the rheometer body (501). The reaction kettle (6) is made of a transparent material; Two image acquisition modules are respectively arranged on the side and below the reaction kettle (6) to respectively acquire images of the side and bottom of the reaction kettle (6).

5. The testing device for the spatial distribution of fibers in concrete according to claim 4, characterized in that: The reaction kettle (6) and the image acquisition module located on the side of the reaction kettle (6) are both connected to a second lifting member, so that the height of the reaction kettle (6) and the image acquisition module located on the side of the reaction kettle (6) can be adjusted by the second lifting member.

6. The testing device for the spatial distribution of fibers in concrete according to claim 5, characterized in that: The second lifting member comprises two first electric telescopic rods (201) and a first moving block (901), the two first electric telescopic rods (201) are both arranged vertically, the bottom ends of the two first electric telescopic rods (201) are connected to a base (1), the image acquisition module located below the reaction kettle (6) is arranged on the top surface of the base (1) and is located between the two first electric telescopic rods (201), the two first electric telescopic rods (201) are respectively connected to a first connecting rod (701), the opposite sides of the reaction kettle (6) are respectively connected to the two first connecting rods (701) through a first fixing member (801), the first moving block (901) is slidably connected to one of the first electric telescopic rods (201), and the image acquisition module located on the side of the reaction kettle (6) is connected to the first moving block (901).

7. The testing device for the spatial distribution of fibers in concrete according to claim 6, characterized in that: A plurality of threaded holes (101) are provided on the top surface of the base (1), and threads are provided at the bottom ends of the two first electric telescopic rods (201), so that the first electric telescopic rods (201) can be detachably connected to the threaded holes (101) via the threads.

8. The testing device for the spatial distribution of fibers in concrete according to claim 7, characterized in that: The image acquisition module located below the reaction kettle (6) is connected to the top of a second movable block (902), and the bottom of the second movable block (902) is provided with threads so that the second movable block (902) can be detachably connected to the threaded holes (101) through the threads, and the threaded holes (101) are evenly distributed along a straight line in the horizontal direction.

9. The testing device for the spatial distribution of fibers in concrete according to claim 4, characterized in that: The first lifting member comprises a second electric telescopic rod (202), the bottom end of the second electric telescopic rod (202) is connected to a base (1), and the top end is connected to a second connecting rod (702), and the second connecting rod (702) is detachably connected to the rheometer body (501) via a second fixing member (802).

10. The testing device for the spatial distribution of fibers in concrete according to claim 4, characterized in that: The reaction kettle (6) is made of acrylic material.

Images