Intelligent detection test device for piezoelectric property of carbon nanotube-doped solid waste concrete

Abstract

The invention provides an intelligent detection test device for piezoelectric property of solid waste concrete doped with carbon nanotubes, and relates to the technical field of intelligent detection of solid waste concrete. The intelligent detection test device for the piezoelectric property of the carbon nanotube-doped solid waste concrete comprises a box body, a reciprocating mechanism, a stirring mechanism and a concrete piezoelectric property detection mechanism, the reciprocating end of the reciprocating mechanism is fixedly connected with a sealing plate, and two symmetrical crushing rollers are arranged at the upper position in the box body; a stirring frame is fixedly connected to the position, below the crushing rollers, of the inner wall of the box body, the stirring frame conducts stirring through a stirring mechanism, and a concrete piezoelectric property detection mechanism is arranged on the inner bottom wall of the box body. The piezoelectric constant and the dielectric constant of the solid waste concrete doped with the carbon nanotubes can be detected through the concrete piezoelectric property detection mechanism and the signal processor, and then the improvement degree of the piezoelectric property of the solid waste concrete doped with the carbon nanotubes is evaluated.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent detection of solid waste concrete, and in particular to an intelligent detection test device for piezoelectric properties of solid waste concrete mixed with carbon nanotubes. Background Art

[0002] A large amount of waste concrete will be generated during urban renewal, demolition and renovation of old buildings. The long-term stacking of waste concrete not only occupies land, but also seriously pollutes the environment. Replacing part of the natural aggregate of concrete with waste concrete to prepare recycled solid waste concrete is an effective way to make comprehensive resource utilization of waste concrete. The resource utilization of solid waste concrete not only consumes a large amount of construction waste, but also saves natural resources such as natural stones, and promotes the green and sustainable development of the construction industry. Although solid waste concrete has the potential for resource recycling, its application still faces the following problems: the recycled aggregates used in solid waste concrete usually have microcracks and pores, resulting in its strength, durability and other properties being lower than ordinary concrete; the corresponding design specifications and testing methods for solid waste concrete are imperfect and lack market competitiveness. In view of the above problems, how to effectively improve the performance of solid waste concrete, improve the corresponding testing methods, and develop the specialized technologies and testing equipment required for the production and application of solid waste concrete has become an urgent problem to be solved.

[0003] The addition of carbon nanotubes can significantly improve the performance of solid waste concrete. Carbon nanotubes have excellent mechanical, electrical and thermal properties. Adding them to solid waste concrete can improve the strength, durability, conductivity and other functional properties of solid waste concrete. Carbon nanotubes can improve the performance of solid waste concrete at multiple scales. The high strength and toughness of carbon nanotubes can significantly improve the compressive strength, tensile strength and toughness of solid waste concrete, and make up for the performance degradation of solid waste concrete due to the use of recycled aggregates; carbon nanotubes can fill the micropores and cracks in solid waste concrete, reduce permeability, thereby improving its frost resistance, impermeability and chemical corrosion resistance, and improve the durability of solid waste concrete; the excellent conductivity of carbon nanotubes can form a conductive network in solid waste concrete, giving solid waste concrete electrical conductivity, electromagnetic shielding and other functions. The appropriate addition of carbon nanotubes can improve the conductivity, mechanical properties, interface effect and microstructure of solid waste concrete, and significantly enhance the piezoelectric properties of solid waste concrete. Solid waste concrete with carbon nanotubes with electrical conductivity, piezoelectricity and other functions has broad application potential in the fields of intelligent buildings and infrastructure monitoring.

[0004] The piezoelectric constant is a parameter that measures the ability of solid waste concrete materials to generate charge under stress. The higher the piezoelectric constant, the better the piezoelectric performance. The dielectric constant reflects the ability of solid waste concrete materials to store charge and affects the charge output efficiency of piezoelectric materials. Adding an appropriate amount of carbon nanotubes can significantly improve the piezoelectric constant and dielectric constant of concrete. The interface effect between carbon nanotubes and cement matrix can promote stress transfer, so that the material can more effectively generate charge separation when subjected to stress, thereby improving its piezoelectric performance. Although research on the detection of piezoelectric properties of solid waste concrete has made certain progress in materials, methods and applications, it still faces the following problems: the piezoelectric constant detection signal of carbon nanotube solid waste concrete is weak, and the generated electrical signal is easily masked by noise; the non-uniformity of concrete materials leads to uneven distribution of its piezoelectric properties, large fluctuations in measurement results, and it is difficult to obtain consistent data; the complex interface effect makes it difficult to accurately characterize the electrical and mechanical behavior at the interface. The above problems lead to the difficulty in detecting the piezoelectric constant and dielectric constant of solid waste concrete added with carbon nanotubes, and the difficulty in evaluating the degree to which carbon nanotubes improve the piezoelectric properties of solid waste concrete. Summary of the invention

[0005] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides an intelligent detection test device for the piezoelectric properties of solid waste concrete added with carbon nanotubes. By improving the piezoelectric performance detection sensitivity of the detection test device, optimizing the solid waste concrete sample preparation process, controlling the environmental conditions of the test process and improving the interface effect between carbon nanotubes and concrete, the detection accuracy and reliability of the piezoelectric properties of solid waste concrete can be effectively improved, which solves the problem of difficulty in detecting the piezoelectric constant and dielectric constant of solid waste concrete added with carbon nanotubes in the related technology, and can effectively evaluate the improvement degree of carbon nanotubes on the piezoelectric properties of solid waste concrete.

[0006] (II) Technical solution To achieve the above objectives, the present invention is implemented through the following technical solutions: an intelligent detection test device for piezoelectric properties of solid waste concrete doped with carbon nanotubes, comprising a box, a reciprocating mechanism, a stirring mechanism and a concrete piezoelectric properties detection mechanism, wherein a feed frame is fixedly connected to the upper surface of the box, a feed opening is provided at the bottom of the feed frame, and the feed opening penetrates into the interior of the box, the reciprocating mechanism is arranged at an upper position on the right outer surface of the box, a sealing plate is fixedly connected to the reciprocating end of the reciprocating mechanism, and the sealing plate is slidably fitted to the bottom of the feed opening; Two symmetrical crushing rollers are arranged at the upper position inside the box body, a mixing frame is fixedly connected to the inner wall of the box body and located below the crushing rollers, the mixing frame is stirred by a mixing mechanism, and a concrete piezoelectric performance detection mechanism is arranged on the inner bottom wall of the box body.

[0007] Preferably, the reciprocating mechanism includes a fixed frame, a driving motor is arranged inside the fixed frame, the output end of the driving motor is fixedly connected to a turntable, the front side of the turntable is rotatably connected to a connecting rod on the outside, the left end of the connecting rod is rotatably connected to a slide, the left side of the slide is fixedly connected to a guide rod, the left end of the guide rod slides through the interior of the box and is fixedly connected to the sealing plate.

[0008] Preferably, baffles are fixedly connected to the inner walls on both sides of the box body and located above the crushing roller.

[0009] Preferably, a water injection pipe is provided through the left side of the stirring frame.

[0010] Preferably, the stirring mechanism includes a stirring motor fixedly connected to the left outer surface of the box body, the output end of the stirring motor passes through the interior of the stirring frame and is fixedly connected to a rotating shaft, and the outer wall of the rotating shaft is fixedly connected to a stirring rod.

[0011] Preferably, a feed pipe is provided at the bottom of the stirring frame, and a solenoid valve is provided at the bottom of the feed pipe.

[0012] Preferably, the concrete piezoelectric performance detection mechanism includes a concrete piezoelectric performance detection box, a first electrode sheet is provided on the left inner wall of the concrete piezoelectric performance detection box, a second electrode sheet is provided on the right inner wall of the concrete piezoelectric performance detection box, a discharge pipe is provided at the bottom of the concrete piezoelectric performance detection box, and a discharge valve is provided at the bottom of the discharge pipe.

[0013] Preferably, an observation window is provided at an upper front side of the box body, and a signal processor is provided at the front side of the box body and below the observation window.

[0014] Preferably, four corners of the bottom end of the box are fixedly connected with support legs.

[0015] (III) Beneficial effects The present invention provides an intelligent testing device for detecting the piezoelectric properties of concrete containing solid waste mixed with carbon nanotubes. It has the following beneficial effects: 1. A feed frame, a reciprocating mechanism and a sealing plate are provided. A certain amount of concrete is placed in the feed frame. The drive motor drives the turntable to rotate. Under the connection of the connecting rod, the slide plate and the guide rod are driven to move horizontally back and forth, and then the sealing plate is driven to move back and forth, so that the intermittent opening and closing of the discharge port can be realized, which is convenient for the discharge of concrete and avoids blockage.

[0016] 2. A crushing roller and a stirring mechanism are provided. The concrete is first crushed by the crushing roller, and then water is added to the concrete to stir it to form a concrete gel liquid containing carbon nanotubes, which is convenient for subsequent detection.

[0017] 3. A concrete piezoelectric performance detection mechanism and a signal processor are provided. The piezoelectric constant and dielectric constant of the solid waste concrete added with carbon nanotubes can be detected by the signal processor by contacting the first electrode sheet and the second electrode sheet with the concrete gel liquid containing carbon nanotubes respectively, and then the degree to which the piezoelectric performance of the solid waste concrete is improved by adding carbon nanotubes can be evaluated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the box body of the present invention; Figure 3 It is a schematic diagram of the reciprocating mechanism of the present invention; Figure 4 It is a connection schematic diagram of the turntable of the present invention; Figure 5 It is a schematic diagram of the concrete piezoelectric property detection mechanism of the present invention.

[0019] Among them, 1. Box body; 2. Feeding frame; 21. Feeding port; 3. Reciprocating mechanism; 4. Sealing plate; 5. Baffle; 6. Crushing roller; 7. Mixing frame; 8. Mixing mechanism; 9. Concrete piezoelectric performance detection mechanism; 10. Water injection pipe; 11. Feeding pipe; 12. Discharge pipe; 13. Support leg; 14. Observation window; 15. Signal processor; 31. Fixed frame; 32. Driving motor; 33. Turntable; 34. Connecting rod; 35. Slide plate; 36. Guide rod; 81. stirring motor; 82. rotating shaft; 83. stirring rod; 91. Concrete piezoelectric performance testing box; 92. First electrode sheet; 93. Second electrode sheet. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example:

[0021] like Figure 1-5 As shown, an embodiment of the present invention provides an intelligent detection test device for the piezoelectric properties of concrete mixed with carbon nanotube solid waste, including a box body 1, a reciprocating mechanism 3, a stirring mechanism 8 and a concrete piezoelectric property detection mechanism 9. A feed frame 2 is fixedly connected to the upper surface of the box body 1 for placing concrete. A discharge port 21 is provided at the bottom of the feed frame 2, and the discharge port 21 penetrates into the interior of the box body 1 for discharge of concrete.

[0022] The reciprocating mechanism 3 is arranged at the upper position of the right outer surface of the box body 1, and the reciprocating end of the reciprocating mechanism 3 is fixedly connected to the sealing plate 4. Specifically, the reciprocating mechanism 3 includes a fixed frame 31, and a driving motor 32 is arranged inside the fixed frame 31. The output end of the driving motor 32 is fixedly connected to a turntable 33. The front side of the turntable 33 is rotatably connected to a connecting rod 34 on the outside, and the left end of the connecting rod 34 is rotatably connected to a slide plate 35. The left side of the slide plate 35 is fixedly connected to a guide rod 36, and the left end of the guide rod 36 slides through the interior of the box body 1 and is fixedly connected to the sealing plate 4. The sealing plate 4 slides and fits the bottom of the discharge port 21.

[0023] The above structure drives the turntable 33 to rotate through the driving action of the driving motor 32, and under the connecting action of the connecting rod 34, drives the slide plate 35 and the guide rod 36 to move horizontally back and forth, and then drives the sealing plate 4 to move back and forth, so as to realize the intermittent opening and closing of the discharge port 21, facilitate the discharge of concrete, and avoid blockage.

[0024] Two symmetrical crushing rollers 6 are arranged at the upper part of the box body 1, which is the prior art and will not be described here. They are used to crush concrete. Baffles 5 are fixedly connected to the inner walls on both sides of the box body 1 and above the crushing rollers 6 to play a protective and guiding role.

[0025] A stirring frame 7 is fixedly connected to the inner wall of the box body 1 and located below the crushing roller 6. A water injection pipe 10 is provided on the left side of the stirring frame 7 for injecting water. The stirring frame 7 is stirred by a stirring mechanism 8. Specifically, the stirring mechanism 8 includes a stirring motor 81 fixedly connected to the left outer surface of the box body 1. The output end of the stirring motor 81 passes through the interior of the stirring frame 7 and is fixedly connected to a rotating shaft 82. A stirring rod 83 is fixedly connected to the outer wall of the rotating shaft 82. A discharge pipe 11 is provided at the bottom of the stirring frame 7, and a solenoid valve is provided at the bottom of the discharge pipe 11.

[0026] In the above structure, the broken concrete blocks fall into the mixing frame 7, water is injected into the mixing frame 7, and then the rotating shaft 82 and the mixing rod 83 are driven by the stirring motor 81 to rotate, so that the concrete can be mixed with water to form a concrete gel liquid containing carbon nanotubes, which is convenient for subsequent detection, and the solenoid valve is opened to control the discharge of materials.

[0027] A concrete piezoelectric performance detection mechanism 9 is provided on the inner bottom wall of the box body 1. Specifically, the concrete piezoelectric performance detection mechanism 9 includes a concrete piezoelectric performance detection box 91. A first electrode sheet 92 is provided on the left inner wall of the concrete piezoelectric performance detection box 91, and a second electrode sheet 93 is provided on the right inner wall of the concrete piezoelectric performance detection box 91. A discharge pipe 12 is provided at the bottom of the concrete piezoelectric performance detection box 91, and a discharge valve is provided at the bottom of the discharge pipe 12.

[0028] The above structure forms a circuit path by bringing the first electrode sheet 92 and the second electrode sheet 93 into contact with the concrete gel solution containing carbon nanotubes, respectively.

[0029] An observation window 14 is provided on the upper front side of the box body 1 for observing the internal situation. A signal processor 15 is provided on the front side of the box body 1 and below the observation window 14. The signal processor 15 is connected to the first electrode sheet 92 and the second electrode sheet 93. Specifically, an AC signal is input to the signal input end of the sample to be tested; the sample to be tested is deformed through the inverse piezoelectric effect through the input AC signal, and the sample to be tested converts the deformation into an electrical signal for output; an output electrical signal of the signal output end of the sample to be tested is obtained, and the output electrical signal is generated by the piezoelectric film through the positive piezoelectric effect; the output electrical signal is amplified or processed to obtain its piezoelectric coefficient.

[0030] The four corners of the bottom end of the box body 1 are fixedly connected with support legs 13 for overall support.

[0031] Working principle: When using the intelligent testing device for piezoelectric properties of solid waste concrete doped with carbon nanotubes, a certain amount of concrete is placed in the feeding frame 2, and the switch of the driving motor 32 is turned on. The driving action of the driving motor 32 drives the turntable 33 to rotate, and under the connecting action of the connecting rod 34, the sliding plate 35 and the guide rod 36 are driven to move horizontally back and forth, and then the sealing plate 4 is driven to move back and forth, so that the intermittent opening and closing of the discharge port 21 can be realized, which is convenient for the discharge of concrete and avoids blockage; The intermittently fed concrete continuously falls to the crushing roller 6. At the same time, the driving power of the crushing roller 6 is turned on to drive the two crushing rollers 6 to rotate in the opposite direction, thereby crushing the concrete. The crushed concrete falls into the mixing frame 7. After all the concrete is mixed, water is injected into the mixing frame 7, and then the switch of the mixing motor 81 is turned on. Through the driving action of the mixing motor 81, the rotating shaft 82 and the stirring rod 83 are driven to rotate, and the concrete can be mixed with water to form a concrete gel liquid containing carbon nanotubes. After a period of time, the solenoid valve is opened to discharge the concrete into the concrete piezoelectric performance detection box 91; By respectively contacting the first electrode sheet 92 and the second electrode sheet 93 with the concrete gel liquid containing carbon nanotubes, the piezoelectric constant and dielectric constant of the solid waste concrete can be detected by the signal processor 15, and the degree of improvement of the piezoelectric properties of the solid waste concrete by adding carbon nanotubes can be effectively evaluated.

[0032] In summary, the intelligent detection test device for piezoelectric properties of solid waste concrete doped with carbon nanotubes provided in the embodiment of the present invention has a compact structure and is easy to operate. It can effectively detect the piezoelectric constant and dielectric constant of solid waste concrete, and further evaluate the degree to which carbon nanotubes improve the piezoelectric properties of solid waste concrete. The advantages and features of the present invention will be described in detail below.

[0033] First, the present invention provides a stirring mechanism so that the solid waste concrete can be fully in contact with water during the stirring process, accelerates the uniform dispersion process of carbon nanotubes in the solid waste concrete, avoids the agglomeration of carbon nanotubes in the solid waste concrete, and forms a uniform solid waste concrete gel containing carbon nanotubes. At the same time, by providing a concrete piezoelectric performance detection mechanism, real-time monitoring can be achieved.

[0034] Secondly, the present invention realizes intermittent opening and closing of the feeding port by setting a reciprocating mechanism, avoids the blockage problem of concrete during the feeding process, and improves production efficiency. In addition, the reciprocating mechanism can also be adjusted according to actual needs to meet the feeding needs of different occasions.

[0035] In addition, the present invention also provides an observation window and a signal processor to facilitate operators to observe the internal conditions of the concrete in real time and understand the piezoelectric constant and dielectric constant of the solid waste concrete, and then evaluate the extent to which carbon nanotubes improve the piezoelectric properties of the solid waste concrete.

[0036] 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. An intelligent testing device for piezoelectric performance of concrete mixed with carbon nanotube solid waste, characterized by: The invention comprises a box body (1), a reciprocating mechanism (3), a stirring mechanism (8) and a concrete piezoelectric property detection mechanism (9); the upper surface of the box body (1) is fixedly connected to a feed frame (2); the bottom of the feed frame (2) is provided with a feed opening (21); the feed opening (21) penetrates into the interior of the box body (1); the reciprocating mechanism (3) is arranged at an upper position on the right outer surface of the box body (1); the reciprocating end of the reciprocating mechanism (3) is fixedly connected to a sealing plate (4); the sealing plate (4) is slidably fitted to the bottom of the feed opening (21); Two symmetrical crushing rollers (6) are arranged at the upper part of the interior of the box (1); a stirring frame (7) is fixedly connected to the inner wall of the box (1) and located below the crushing rollers (6); the stirring frame (7) stirs the concrete through a stirring mechanism (8); and a concrete piezoelectric property detection mechanism (9) is arranged on the inner bottom wall of the box (1).

2. According to claim 1, a piezoelectric performance intelligent detection test device for carbon nanotube solid waste concrete is characterized by: The reciprocating mechanism (3) comprises a fixed frame (31), a driving motor (32) is arranged inside the fixed frame (31), an output end of the driving motor (32) is fixedly connected to a rotating disk (33), a front side of the rotating disk (33) is rotatably connected to a connecting rod (34) on the outside, a left end of the connecting rod (34) is rotatably connected to a sliding plate (35), a left side of the sliding plate (35) is fixedly connected to a guide rod (36), and a left end of the guide rod (36) slides through the interior of the box body (1) and is fixedly connected to a sealing plate (4).

3. The intelligent testing device for piezoelectric performance of solid waste concrete mixed with carbon nanotubes according to claim 1 is characterized by: Baffles (5) are fixedly connected to the inner walls on both sides of the box body (1) and located above the crushing rollers (6).

4. The intelligent testing device for piezoelectric performance of solid waste concrete mixed with carbon nanotubes according to claim 1 is characterized by: A water injection pipe (10) is provided through the left side of the stirring frame (7).

5. The intelligent testing device for piezoelectric performance of solid waste concrete mixed with carbon nanotubes according to claim 1 is characterized by: The stirring mechanism (8) comprises a stirring motor (81) fixedly connected to the left outer surface of the box body (1); the output end of the stirring motor (81) penetrates into the interior of the stirring frame (7) and is fixedly connected to a rotating shaft (82); and the outer wall of the rotating shaft (82) is fixedly connected to a stirring rod (83).

6. The intelligent testing device for detecting piezoelectric properties of solid waste concrete mixed with carbon nanotubes according to claim 1, characterized in that: A feed pipe (11) is provided at the bottom of the stirring frame (7), and a solenoid valve is provided at the bottom of the feed pipe (11).

7. The intelligent testing device for piezoelectric performance of solid waste concrete mixed with carbon nanotubes according to claim 1 is characterized by: The concrete piezoelectric performance detection mechanism (9) comprises a concrete piezoelectric performance detection box (91), a first electrode sheet (92) being arranged on the left inner wall of the concrete piezoelectric performance detection box (91), a second electrode sheet (93) being arranged on the right inner wall of the concrete piezoelectric performance detection box (91), a discharge pipe (12) being arranged at the bottom of the concrete piezoelectric performance detection box (91), and a discharge valve being arranged at the bottom of the discharge pipe (12).

8. The intelligent testing device for piezoelectric performance of solid waste concrete mixed with carbon nanotubes according to claim 1, characterized in that: An observation window (14) is provided at an upper position on the front side of the box body (1), and a signal processor (15) is provided on the front side of the box body (1) and below the observation window (14).

9. The intelligent testing device for piezoelectric performance of concrete containing solid waste mixed with carbon nanotubes according to claim 1, characterized in that: The four corners of the bottom end of the box body (1) are fixedly connected with support legs (13).

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