Apparatus and method for simulating bubble overflow using a transparent magnetic slurry

Abstract

The application discloses a device and method for simulating bubble overflow by using transparent magnetic slurry, which comprises a vibrating table and a transparent container connected to the top of the vibrating table, a stirrer arranged at the center of the transparent container, a motor connected to the stirrer and arranged in the vibrating table, a flushing pipe and a liquid discharge pipe connected to the lower part of the transparent container respectively, valves installed on the flushing pipe and the liquid discharge pipe, a gas collecting pipeline connected to the top of the transparent container, a gas flow meter arranged in the gas collecting pipeline, and a gas collecting cavity connected to the top of the gas collecting pipeline; tracks are arranged on the two sides of the transparent container, electromagnets are installed on the tracks, and high-speed cameras are slidably connected to the tracks. The application can record the bubble overflow during the whole test process, realizes quantitative analysis of the bubble overflow, optimizes various environmental parameters and construction parameters during the test process, provides accurate reference data for engineering application, and has high engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of concrete experimental technology, and specifically relates to a device and method for simulating bubble overflow using transparent magnetic slurry. Background Technology

[0002] Cement mortar and concrete have become the mainstream choice for modern building materials. Due to the material properties of cement mortar and concrete, it is impossible to conduct visual research on their internal structure. As the number of structural failure accidents caused by internal structural damage increases, the visualization research on the internal structure of cement mortar and concrete is receiving more and more attention.

[0003] The presence of air bubbles within cement mortar and concrete can affect the strength, corrosion resistance, and appearance of concrete structures, ultimately leading to structural damage. Visual studies of air bubble overflow in cement mortar and concrete will provide reliable parameters for adjusting the relationship between air bubble porosity and the strength and quality grades of concrete components in practical engineering projects. Furthermore, it will provide parameters such as the optimal porosity control range and the optimal water-cement ratio for magnetic grout in the production of prefabricated structures, which will help save engineering costs, improve safety performance, standardize mass production, and pre-control cast-in-place concrete specimens.

[0004] Chinese patent applications with publication numbers CN209920146U and CN208518320U both disclose molds for observing the release of air bubbles in fair-faced concrete. They use transparent molds to observe the overflow of air bubbles in concrete, but neither of them achieves quantitative analysis and process recording of the overflowing air bubbles in concrete. They cannot provide accurate data support for actual engineering applications and have low engineering application value. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device that uses transparent magnetic slurry to simulate bubble overflow. This device can record the bubble overflow situation throughout the entire test and achieve quantitative analysis of the bubble overflow amount. During the test, various environmental and construction parameters can be optimized, providing accurate reference data for engineering applications and demonstrating high engineering application value.

[0006] The technical objective of this invention is achieved through the following technical solution: a device for simulating bubble overflow using transparent magnetic slurry, comprising a vibrating table and a transparent container connected to the top of the vibrating table, a stirrer disposed at the center of the transparent container, the stirrer being connected to a motor disposed within the vibrating table, a rinsing pipe and a drain pipe respectively connected to the lower two sides of the transparent container, both of which are equipped with valves, a gas collecting pipe also connected to the top of the transparent container, a gas flow meter disposed within the gas collecting pipe, and a gas collecting chamber connected to the top of the gas collecting pipe; tracks are also disposed on both sides of the transparent container, electromagnets are mounted on the tracks, and a high-speed camera is slidably connected to the tracks.

[0007] Preferably, the transparent container is further provided with a heating component, a humidification component, and a temperature and humidity sensor.

[0008] Preferably, the heating component is a titanium electric heating tube.

[0009] Preferably, the humidification assembly includes a water tank and an evaporator disposed within the water tank.

[0010] Preferably, a weighing sensor is provided at the bottom of the transparent container.

[0011] Preferably, the gas collection chamber is equipped with an exhaust gas treatment device.

[0012] Preferably, the exhaust gas treatment device includes activated carbon and an alkaline agent.

[0013] The present invention also provides a method for simulating bubble overflow using a transparent magnetic slurry, comprising the following steps:

[0014] S1 is made into transparent slurries with different proportions of transparent sand, epoxy resin AB glue, transparent magnetic materials or small-particle-size opaque magnets.

[0015] S2 sets the ambient temperature and relative humidity inside the transparent container according to the test conditions;

[0016] S3 adjusts the displacement and current of the electromagnet on the track according to the test conditions to regulate the magnetic field strength and direction within the transparent container, thereby controlling the viscosity of the magnetic slurry in real time.

[0017] S4 uses a weighing sensor and a gas flow meter to record the initial mass of the transparent slurry, the mass change at different time points, and the amount of bubble overflow, while a high-speed camera takes pictures to record the bubble overflow process.

[0018] The S5 processes images recorded by a high-speed camera on a computer terminal to analyze the distribution, size, overflow path, and speed of bubbles before, during, and after vibration.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. In the method of the present invention, the transparent slurry produced has a water-cement ratio and coarse and fine aggregate content similar to those of cement mortar / concrete. At the same time, external factors such as admixtures, additives, construction environment, and vibration time have similar effects on the transparent slurry and cement mortar / concrete. Furthermore, the method can also adjust the water-cement ratio, aggregate content, and other factors of the slurry by changing the material composition ratio of the transparent slurry to meet different test conditions and requirements.

[0021] 2. In different working environments, due to limitations, such as in-situ cast concrete components where magnetic oscillation devices are inconvenient or impossible to use on certain surfaces; or due to differences in the stress and performance of the components themselves (such as piles, columns, etc.), magnetic oscillation is required based on different load distributions and bearing capacities. The experimental device of this invention can also perform visual simulations by setting magnetic oscillations in different directions and ranges. The resulting series of parameters can be used to predict the effectiveness and optimal results of the method under this environment, and to provide parameter ranges for construction details, such as the control of oscillation time, area, and frequency, thereby improving construction accuracy and reliability.

[0022] 3. This invention, by incorporating a tail gas treatment device, can purify harmful bubbles from overflowing slurry, ensuring the gas meets emission standards before being released into the air, thus preventing environmental pollution. This tail gas treatment device can be replaced with a transparent, elongated track. When bubbles begin to overflow, a camera begins recording; the transparent track is long enough to sustain the visualization of the bubble overflow. The entire process should be recorded, from the first bubble about to escape to the last bubble overflowing from the concrete surface. The width of the transparent track is set according to the bubble size, approximately 3mm-10mm or less than 1 / 10 of the smallest side length of the specimen, ensuring the bubbles escape without compression or overlap. After the bubble expulsion is complete, images from different times are extracted from the video recorded by the camera and processed using a dichotomy method.

[0023] 4. This invention influences the magnetic transparent slurry by quantitatively controlling the magnetic strength of the electromagnet and changing the position of the electromagnet in a closed environment, replacing the vibration table to simulate slurry vibration. This eliminates the problems of mechanical vibration tables, such as inability to purify and remove dust, pollution of the working environment, and inability to generate horizontal vibration force.

[0024] 5. This invention utilizes the properties of magnetic materials, and in combination with electromagnets, achieves electromagnetic oscillation and magnetocaloric effects, which will help bubbles to escape faster, make full use of energy, conform to the development concept of saving resources, environmental protection and green development, save resources, and improve efficiency and engineering quality. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] In the above attached diagram: 1. Vibration table; 2. Transparent container; 3. Stirrer; 4. Motor; 5. Flushing pipe; 6. Drain pipe; 7. Valve; 8. Gas collection pipe; 9. Gas flow meter; 10. Gas collection chamber; 11. Track; 12. Electromagnet; 13. High-speed camera; 14. Heating component; 15. Humidification component; 16. Temperature and humidity sensor; 17. Weighing sensor; 18. Exhaust gas treatment device. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] See appendix Figure 1 As a preferred embodiment of the present invention, this embodiment provides a device for simulating bubble overflow using a transparent magnetic slurry, including a vibration table 1 and a transparent container 2 connected to the top of the vibration table 1. A stirrer 3 is set at the center of the transparent container 2. The stirrer 3 is connected to a motor 4 set in the vibration table 2 by bevel gear transmission. A flushing pipe 5 and a drain pipe 6 are respectively connected to the lower two sides of the transparent container 2. Valves 7 are installed on both the flushing pipe 5 and the drain pipe 6. A gas collecting pipe 8 is also connected to the top of the transparent container 2. A gas flow meter 9 is installed in the gas collecting pipe 8. A gas collecting chamber 10 is connected to the top of the gas collecting pipe 8. A fan is installed in the gas collecting chamber. Tracks 11 are also set on both sides of the transparent container 2. Electromagnets 12 are installed on the tracks 11 in an adjustable manner by a buckle. A high-speed camera 13 is slidably connected to the tracks 11.

[0029] In the above embodiments, the vibration table 1 is selected from the ZP-4 model of Henan Rencongzhong Machinery Manufacturing Co., Ltd., and the vibration method adopts vibration table vibration and electromagnetic vibration, and a control group is set up for comparison.

[0030] In some preferred embodiments, in order to simulate various environmental conditions, the transparent container 2 is also provided with a heating component 14, a humidification component 15, and a temperature and humidity sensor 16.

[0031] The heating component 14 is a titanium electric heating tube; the humidification component 15 includes a water tank and an evaporator disposed in the water tank.

[0032] In some other preferred embodiments, a weighing sensor 17 is provided at the bottom of the transparent container 2 to monitor the quality changes of the transparent slurry.

[0033] In some other preferred embodiments, the gas collection chamber 10 is provided with an exhaust gas treatment device 18, which includes activated carbon and an alkaline agent. The exhaust gas treatment device 18 can absorb and purify the toxic and harmful substances in the exhaust gas before it is discharged, thus avoiding environmental pollution.

[0034] A method for simulating bubble overflow using a transparent magnetic slurry, employing the aforementioned apparatus, includes the following steps:

[0035] S1 is made into transparent slurries with different proportions of transparent sand, epoxy resin AB glue, transparent magnetic materials or small-particle-size opaque magnets.

[0036] S2 sets the ambient temperature and relative humidity inside the transparent container 2 according to the test conditions; adds the transparent slurry into a rectangular container of 500mm×500mm×500mm, and records the initial mass of the transparent slurry using a weighing sensor.

[0037] S3 adjusts the displacement and current of electromagnet 12 on track 11 according to the test conditions to regulate the magnetic field strength and direction within the transparent container 2, and performs magnetic oscillation to regulate the viscosity of magnetic slurry in real time.

[0038] S4 uses a weighing sensor and a gas flow meter to record the initial mass of the transparent slurry, the mass change at different time points, and the amount of bubble overflow, while a high-speed camera takes pictures to record the bubble overflow process.

[0039] The S5 processes the images recorded by the high-speed camera through a computer terminal to analyze the distribution, size, overflow path, and speed of bubbles before, during, and after the vibration.

[0040] After the S6 test is completed, turn on the agitator and water pipe to rinse the transparent container to increase the fluidity of the slurry, and turn on the exhaust fan in the gas collection chamber to quickly remove harmful gases.

[0041] In the above embodiments, attention should be paid to controlling the density of the magnetic material. If the density is too high, it will lead to a reduction in the experimental observation effect. The function of the electromagnet 12 is to use electromagnetic oscillation for compaction. Therefore, in this step, it can also be replaced by a vibrating table for mechanical compaction as needed, or ultrasonic vibration, which can change the viscosity of concrete to a certain extent, can be used.

[0042] In some preferred embodiments, a tracer that does not affect the performance of the slurry and is immiscible is added to the slurry to more intuitively observe the path of the bubble overflow and the change in the amount of bubble overflow over time and other parameters.

[0043] During the above experiments, the following situations occurred when the transparent slurry was used to simulate bubble overflow: (1) the transparent slurry solidified and hardened; (2) the high-speed camera could not observe the changes in bubble overflow of the transparent slurry. The performance testing method is as follows:

[0044] (1) Average gas overflow per unit time

[0045] When the current control device starts working, a gas flow meter is used to record the average gas overflow per unit time during different forms of vibration, which is calculated using the following formula:

[0046]

[0047] In the formula, V n The average gas overflow rate per unit time, in mm. 3 / s;q min The amount of gas overflow during the simulated vibration process recorded by the gas flow meter, in mm. 3 ;t min The time taken to simulate the vibration process, in seconds.

[0048] (2) Rate of change in mass

[0049] Once the bubbles begin to overflow, a weighing sensor is used to record the mass of the transparent concrete slurry at different time points during the vibration process. The rate of change of mass is calculated using the following formula:

[0050]

[0051] In the formula, ΔW i The percentage change in mass of the transparent slurry during this time period, in %; W0, W i It represents the initial mass and the mass at that point in time, in kg.

[0052] (3) Visualization and simulation analysis

[0053] The current is controlled by a current regulation device to simulate magnetic field vibration. Images recorded by a high-speed camera are used to visually observe the color depth, particle content, and distribution of the transparent magnetic mortar. The viscosity of the transparent magnetic cement mortar and the distribution, morphology, and size of air bubbles within it are analyzed. Subsequently, the images undergo grayscale processing at the terminal, and the graphics at different times t are superimposed. The flow path d and average velocity v are calculated through curve length calculation.

[0054]

[0055] In the formula, v is the average velocity of the bubble at that time point, in cm / s; t is the time point, in s; and d is the path the bubble has traveled at that time point, in cm.

[0056] The simulation system of this invention can simulate magnetic field vibration by adjusting the current flowing through the electromagnet 12, thereby simulating the overflow of air bubbles in the transparent magnetic slurry. This allows for high-speed camera and computer terminal processing experiments, providing an effective path for monitoring and handling air bubbles in engineering projects, as well as the optimal mix proportions for specific engineering cases. Due to differences in the transparent magnetic mortar production process, the temperature and relative humidity in the environment vary. During indoor testing, the transparent magnetic mortar used in the experiment employs the water-cement ratio, coarse and fine aggregate content, and other components found in actual building materials. The temperature and humidity are also based on those used in the actual building construction environment.

[0057] For example, in an actual building construction environment, the temperature is 40℃, the relative humidity is 90%, and the coarse aggregate content is 8%. In the bubble simulation test, the temperature, humidity, and coarse aggregate content are the same as in the actual building construction environment. By recording with a high-speed camera and processing with a computer terminal, the overflow of bubbles in the transparent magnetic mortar of concrete in actual building construction can be simulated.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for simulating bubble overflow using a transparent magnetic slurry, comprising a vibrating table and a transparent container connected to the top of the vibrating table, characterized in that: A stirrer is located at the center of the transparent container, and the stirrer is connected to a motor installed in the vibration table. A rinsing pipe and a drain pipe are connected to the lower two sides of the transparent container, respectively. Valves are installed on both the rinsing pipe and the drain pipe. A gas collection pipe is also connected to the top of the transparent container, and a gas flow meter is installed in the gas collection pipe. A gas collection chamber is connected to the top of the gas collection pipe. Tracks are also provided on both sides of the transparent container, and electromagnets are installed on the tracks. A high-speed camera is also slidably connected to the tracks. A heating component, a humidification component, and a temperature and humidity sensor are also installed inside the transparent container. The method for simulating bubble overflow includes the following steps: S1 is made into transparent slurries with different proportions of transparent sand, epoxy resin AB glue, transparent magnetic materials or small-particle-size opaque magnets. S2 sets the ambient temperature and relative humidity inside the transparent container according to the test conditions; S3 adjusts the displacement and current of the electromagnet on the track according to the test conditions to regulate the magnetic field strength and direction within the transparent container, thereby controlling the viscosity of the magnetic slurry in real time. S4 uses a weighing sensor and a gas flow meter to record the initial mass of the transparent slurry, the mass change at different time points, and the amount of bubble overflow, while a high-speed camera takes pictures to record the bubble overflow process. The S5 processes images recorded by a high-speed camera on a computer terminal to analyze the distribution, size, overflow path, and speed of bubbles before, during, and after vibration.

2. The device for simulating bubble overflow using a transparent magnetic slurry according to claim 1, characterized in that: The heating component is a titanium electric heating tube.

3. The device for simulating bubble overflow using a transparent magnetic slurry according to claim 1, characterized in that: The humidification assembly includes a water tank and an evaporator installed inside the water tank.

4. The device for simulating bubble overflow using a transparent magnetic slurry according to claim 1, characterized in that: A weighing sensor is installed at the bottom of the transparent container.

5. The device for simulating bubble overflow using a transparent magnetic slurry according to claim 1, characterized in that: The gas collection chamber is equipped with an exhaust gas treatment device.

6. The device for simulating bubble overflow using a transparent magnetic slurry according to claim 5, characterized in that: The exhaust gas treatment device includes activated carbon and an alkaline agent.

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