Real-time Observation Device and Method for Air Entrained Fresh Concrete Bubbles

Abstract

The present invention discloses a real-time observation device for air-entrained fresh concrete bubbles, which includes a circulating pumping mechanism and an experimental observation mechanism. The circulating pumping mechanism includes a motor drive box, a concrete feed box, and a pumping pipeline; the experimental observation mechanism includes a computer, an observation base, an observation tank, and a microscope assembly. The left and right sides of the observation tank are provided with pumping pipeline docking pipes for installing the pumping pipeline, and an openable and sealable baffle is provided in the pumping pipeline docking pipe. The present invention also discloses a real-time observation method for air-entrained fresh concrete bubbles, which includes the following steps: Step S1, use the above-mentioned real-time observation device for air-entrained fresh concrete bubbles; Step S2, observe the concrete bubbles in flow; Step S3, remove the pipeline for cleaning; Step S4, observe the concrete bubbles in stagnation; Step S5, remove the pipeline for cleaning, which has the advantages of simulating the pipeline transportation process of high-air-content concrete, comprehensive and accurate analysis, and timely observation.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete bubble detection, and particularly relates to a device and method for real-time observation of bubbles in freshly mixed air-entrained concrete. Background Art

[0002] After an air-entraining agent is incorporated into wet shotcrete for mines, tiny bubbles are filled and accumulated in the cross-scale particle system in the form of "soft aggregate", and the change of bubble performance will affect the workability of concrete.

[0003] At present, domestic and foreign scholars mainly study the change law of air content after bubbles are introduced into concrete. Since the change of freshly mixed air-entrained concrete is usually rapid, it is necessary to observe the bubbles in freshly mixed concrete in a timely manner. The existing research on the change process of bubble characteristics of freshly mixed air-entrained concrete in the pipeline is not clear enough, so it is difficult to fully explain the pipeline transportation mechanism of wet shotcrete with air content in mines. Therefore, when making high-quality pipelines accurately so that the air content of air-entrained concrete meets the high-standard air content when it is transported to the site through the pipeline, it is impossible. Summary of the Invention

[0004] The invention aims to provide a device and method for real-time observation of bubbles in freshly mixed air-entrained concrete, accurately analyze the change process of bubble characteristics of freshly mixed air-entrained concrete in the pipeline, and solve the problem that the pipeline transportation mechanism of wet shotcrete with air content is not clear due to the lack of research on the change process of bubble characteristics of concrete in the pipeline.

[0005] For this purpose, the technical solution adopted by the invention is as follows: A device for real-time observation of bubbles in freshly mixed air-entrained concrete includes a circulating pumping mechanism and an experimental observation mechanism. The circulating pumping mechanism includes a motor drive box, a concrete feeding box juxtaposed with the motor drive box, and a pumping pipeline. The motor shaft in the motor drive box penetrates into the concrete feeding box, and a turbine blade is installed at the end of the shaft. The top of the concrete feeding box is provided with a feeding port, and pumping pipeline interfaces for docking and installing the pumping pipeline are provided on the top of the concrete feeding box and on one side corresponding to the turbine blade. The experimental observation mechanism includes a computer, an observation base, an observation tank, and a microscope assembly arranged from bottom to top. The top surface of the observation tank is equipped with a glass plate cover pressed by left and right side pressing strips. Pumping pipeline docking pipes for installing the pumping pipeline are provided on the left and right sides of the observation tank, so that the observation tank and the concrete feeding box form a concrete transmission loop through the pumping pipeline. An openable and sealable baffle is provided in the pumping pipeline docking pipe. The microscope assembly includes an installation slider that can move back and forth along the observation tank and a microscope main body located on the installation slider. The microscope main body is connected to the computer through a data cable.

[0006] Preferably, a fixed clamping ring is provided at the docking joint of the pumping pipeline and the pumping pipeline, and a pipeline fixing member fixed by bolts is provided at the docking joint of the pumping pipeline interface and the pumping pipeline, which is convenient for cleaning the pipeline after removing the pumping pipeline, and the structural design is reasonable.

[0007] More preferably, the lower part of the concrete feeding box adopts a single-layer drawer structure, which is convenient for pulling out and cleaning the concrete inside the box, and the operation is simple.

[0008] More preferably, the microscope body adopts a Lecia microscope, which has a high-quality optical system and clear images.

[0009] More preferably, the motor shaft in the motor drive box is connected to the main shaft of the turbine blade by a key, the connection is stable, the installation is convenient, the turbine blade is in an arc shape with upturned edges at the front and back, and the included angle between the upturned edges at the front and back is 15°-20°, which can generate better driving force.

[0010] More preferably, a control panel for controlling the motor switch is installed on the outside of the motor drive box, which is convenient for manual operation.

[0011] More preferably, the computer is installed with Lecia microscopy system software and Image-pro image processing software for presenting the images taken by the Lecia microscope, and the volume of concrete bubbles, bubble diameter, the number of bubbles in different diameter ranges and the proportion of the number of bubbles in different diameter ranges can be accurately obtained.

[0012] A method for real-time observation of air-entrained fresh concrete bubbles includes the following steps:

[0013] Step S1: Using the above-mentioned device for real-time observation of air-entrained fresh concrete bubbles, introduce the concrete into the concrete feeding box through the feeding port, then continue to add air-entraining agent, operate the control panel of the motor drive box to start the motor, open the openable and sealable baffle, so that while the turbine blade rotates to fully stir the concrete and the air-entraining agent, it also drives the concrete to flow through the pumping pipeline and pass through the observation slot;

[0014] Step S2: Drive the microscope body to move to the center of the glass plate cover through the installed slider, set time nodes, and observe the air-entrained fresh concrete bubbles in the flowing state at 30s, 1min, 3min, 5min, 10min, 15min, and 30min after the motor is turned on;

[0015] Analyze and collect the bubble diameter, bubble area, the number of bubbles in different diameter ranges and the proportion of bubbles in different diameter ranges at different time nodes through the Lecia microscopy system software and Image-pro image processing software of the computer, so as to obtain the characteristic data of air-entrained fresh concrete bubbles in the flowing state;

[0016] Step S3, after the observation is completed, the pipeline is removed for cleaning, the lower part of the concrete feed box is opened and the inner wall is cleaned by flushing with clean water, and then the concrete is introduced into the concrete feed box through the feed port again, and then the air entraining agent is continued to be added, and the control panel of the motor drive box is operated to start the motor, and when the concrete is transported through the observation slot, the openable and closable sealing baffle is closed, and the motor is turned off;

[0017] Step S4, driving the microscope body to move to the center of the glass plate cover by installing a slider, setting time nodes, and observing the stagnant concrete bubbles at time nodes of 30s, 1min, 3min, 5min, 10min, 15min, and 30min after turning off the motor;

[0018] The Lecia microscopic system software and Image-pro image processing software on the computer are used to analyze and collect the bubble diameter, bubble area, number of bubbles in different diameter ranges and the proportion of bubbles in different diameter ranges at different time points, so as to obtain the bubble characteristic data of stagnant air-entrained fresh concrete;

[0019] Step S5: After the observation is completed, the pipeline is removed for cleaning, and the lower part of the concrete feed box is opened and the inner wall is cleaned by flushing with clean water.

[0020] Beneficial effects of the present invention:

[0021] (1) It fills the gap in the market for the lack of equipment that can comprehensively analyze the bubble characteristics and bubble characteristic change process of freshly air-entrained concrete. It can comprehensively analyze the bubble characteristics (volume, shape, and quantity) of freshly air-entrained concrete, and the research results are accurate and reliable.

[0022] (2) The observation trough and the concrete feed box form a concrete transmission loop through the pumping pipeline. By opening the retractable sealing baffle, the pipeline transportation process of high-gas-content concrete is simulated, and the pipeline transportation mechanism of high-gas-content wet shotcrete for mining is explained clearly, so as to manufacture high-quality transportation concrete pipelines and ensure that high-gas-content wet shotcrete can be transported to the construction site.

[0023] (3) An openable and closable sealing baffle is provided inside the butt joint of the pumping pipeline. By closing the openable and closable sealing baffle, the internal space of the observation tank is sealed to facilitate the observation of the characteristic data of the concrete bubbles stagnant in the pipeline, so as to grasp the characteristic change data of the concrete bubbles when encountering an emergency situation where the wet sprayed concrete with high air content stagnates in the pipeline, and the analysis is comprehensive and accurate.

[0024] (4) The concrete is introduced into the concrete feed box through the feed inlet, and then the air-entraining agent is continuously added. The rotation of the turbine blades can fully stir the concrete and the air-entraining agent, ensuring a high air content in the concrete, making it easier to observe the bubble changes. At the same time, the rotation of the turbine blades can also provide the driving force for transporting the concrete, killing two birds with one stone. Since the air-entraining agent is added in the concrete feed box, the bubble characteristics of the freshly mixed concrete can be observed in a timely manner, without the need to first air-entrain the concrete and then pour it into the concrete feed box, thus avoiding the inability to observe the initial bubble changes in a timely manner.

[0025] In summary, it has the advantages of simulating the pipeline transportation process of high air content concrete, comprehensive and accurate analysis, and timely observation. Brief Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the docking installation of the pumping pipeline interface and the pumping pipeline.

[0028] Figure 3 It is a schematic structural diagram of the docking installation of the docking pipe of the pumping pipeline and the pumping pipeline. Detailed Embodiments

[0029] The present invention will be further described below through embodiments in conjunction with the drawings:

[0030] Combined with Figure 1 — Figure 3 As shown, an apparatus for real-time observation of bubbles in air-entrained freshly mixed concrete is composed of a circulating pumping mechanism 1 and an experimental observation mechanism 2.

[0031] The circulating pumping mechanism 1 is composed of a motor drive box 12, a concrete feed box 13 juxtaposed with the motor drive box 12, and a pumping pipeline 11.

[0032] A control panel for controlling the motor switch is installed on the outer side of the motor drive box 12.

[0033] The motor shaft in the motor drive box 12 penetrates into the concrete feed box 13, and a turbine blade 14 is installed at the end of the shaft. The motor shaft in the motor drive box 12 and the main shaft of the turbine blade 14 are connected by a key. The turbine blade 14 is in the shape of an arc with front and rear upturned edges, and the included angle between the front and rear upturned edges is 15° - 20°.

[0034] The lower part of the concrete feed box 13 adopts a single-layer drawer structure.

[0035] The top of the concrete feed box 13 is provided with a feed inlet 131, and both the top of the concrete feed box 13 and the side corresponding to the turbine blade 14 are provided with pumping pipeline interfaces 132 for the docking installation of the pumping pipeline 11.

[0036] At the connection between the pumping pipeline interface 132 and the pumping pipeline 11, there is a pipeline fixing part 112 fixed by tightening bolts.

[0037] The experimental observation mechanism 2 consists of a computer, an observation base 21 arranged from bottom to top, an observation tank 22, and a microscope assembly 23.

[0038] On the top surface of the observation tank 22, there is a glass plate cover 221 pressed by left and right side pressing strips 222.

[0039] On the left and right sides of the observation tank 22, there are pumping pipeline docking pipes 223 for installing the pumping pipeline 11, so that the observation tank 22 and the concrete feeding tank 13 form a concrete transmission loop through the pumping pipeline 11.

[0040] At the connection between the pumping pipeline docking pipe 223 and the pumping pipeline 11, there is a fixed clamping ring 111, and an openable and closable sealing baffle 224 is arranged inside the pumping pipeline docking pipe 223.

[0041] The microscope assembly 23 consists of an installation slider 231 that can move back and forth along the observation tank 22 and a microscope main body 232 located on the installation slider 231.

[0042] The microscope main body 232 is connected to the computer through a data cable, and the microscope main body 232 uses a Lecia microscope.

[0043] The computer is installed with Lecia microscope system software for presenting the pictures taken by the Lecia microscope and Image-pro image processing software.

[0044] The present invention also provides a method for real-time observation of air-entrained fresh concrete bubbles, and the specific implementation steps are as follows:

[0045] Step S1: Using the above-mentioned device for real-time observation of air-entrained fresh concrete bubbles, introduce the concrete into the concrete feeding tank 13 through the feeding port 131, then continue to add an air-entraining agent, operate the control panel of the motor drive box 12 to start the motor, open the openable and closable sealing baffle 224, so that while the turbine blade 14 rotates to fully stir the concrete and the air-entraining agent, it also drives the concrete to flow through the pumping pipeline 11 and pass through the observation tank 22.

[0046] Step S2: Drive the microscope main body 232 to move to the center of the glass plate cover 221 through the installation slider 231, set time nodes, and observe the flowing concrete bubbles at the time nodes of 30s, 1min, 3min, 5min, 10min, 15min, and 30min after the motor is started.

[0047] The bubble diameter, bubble area, the number of bubbles in different diameter ranges, and the proportion of bubbles in different diameter ranges at different time nodes are analyzed and collected through the Lecia microscopic system software of the computer and the Image-pro image processing software, so as to obtain the bubble characteristic data of the air-entrained fresh concrete during flow.

[0048] Step S3: After the observation is completed, the pipeline is removed for cleaning. The lower part of the concrete feeding box 13 is opened, and the inner wall is washed by flushing with clean water. Then, the concrete is re-introduced into the concrete feeding box 13 through the feeding port 131, and then the air-entraining agent is continuously added. The control panel of the motor drive box 12 is operated to start the motor. When the concrete is transported past the observation tank 22, the openable and closable sealing baffle 224 is closed, and the motor is turned off.

[0049] Step S4: The microscope body 232 is driven by the installed slider 231 to move to the center of the glass plate cover 221. The time nodes are set, and the air-entrained fresh concrete bubbles in a stagnant state are observed at the time nodes of 30 s, 1 min, 3 min, 5 min, 10 min, 15 min, and 30 min after the motor is turned off.

[0050] The bubble diameter, bubble area, the number of bubbles in different diameter ranges, and the proportion of bubbles in different diameter ranges at different time nodes are analyzed and collected through the Lecia microscopic system software of the computer and the Image-pro image processing software, so as to obtain the bubble characteristic data of the air-entrained fresh concrete in a stagnant state.

[0051] Step S5: After the observation is completed, the pipeline is removed for cleaning. The lower part of the concrete feeding box 13 is opened, and the inner wall is washed by flushing with clean water.

Claims

1. An air-entrained fresh concrete bubble real-time observation device, characterized in that: It includes a circulating pumping mechanism (1) and an experimental observation mechanism (2). The circulating pumping mechanism (1) includes a motor drive box (12), a concrete feeding box (13) juxtaposed with the motor drive box (12), and a pumping pipeline (11). The motor shaft in the motor drive box (12) penetrates into the concrete feeding box (13), and a turbine blade (14) is installed at the end of the shaft. A feeding port (131) is provided at the top of the concrete feeding box (13). Pumping pipeline interfaces (132) for docking and installing the pumping pipeline (11) are provided at the top of the concrete feeding box (13) and on one side corresponding to the turbine blade (14). The experimental observation mechanism (2) includes a computer, an observation base (21) arranged from bottom to top, an observation tank (22), and a microscope assembly (23). A glass plate cover (221) pressed by left and right side pressing strips (222) is provided on the top surface of the observation tank (22). Pumping pipeline docking pipes (223) for installing the pumping pipeline (11) are provided on the left and right sides of the observation tank (22), so that a concrete transmission loop is formed between the observation tank (22) and the concrete feeding box (13) through the pumping pipeline (11). An openable and sealable baffle (224) is provided in the pumping pipeline docking pipe (223). The microscope assembly (23) includes an installation slider (231) that can move back and forth along the observation tank (22) and a microscope main body (232) located on the installation slider (231). The microscope main body (232) is connected to the computer through a data cable; The motor shaft in the motor drive box (12) is key-connected to the main shaft of the turbine blade (14). The turbine blade (14) is in an arc shape with front and rear upturned edges, and the included angle between the front and rear upturned edges is 15° - 20°; The computer is installed with Lecia microscopy system software and Image-pro image processing software for presenting the images taken by the Lecia microscope. By analyzing and collecting the bubble diameter size, bubble area size, the number of bubbles in different diameter ranges, and the proportion of bubbles in different diameter ranges at different time nodes through the Lecia microscopy system software and Image-pro image processing software of the computer, the bubble characteristic data of the air-entrained fresh concrete during flow can be obtained.

2. The air-entrained fresh concrete bubble real-time observation device according to claim 1, characterized in that: A fixed clamping ring (111) is provided at the docking part of the pumping pipeline docking pipe (223) and the pumping pipeline (11). A pipeline fixing piece (112) tightened by bolts is provided at the docking part of the pumping pipeline interface (132) and the pumping pipeline (11).

3. The air-entrained fresh concrete bubble real-time observation device according to claim 1, characterized in that: The lower part of the concrete feeding box (13) adopts a single-layer drawer structure.

4. The air-entrained fresh concrete bubble real-time observation device according to claim 1, characterized in that: The microscope main body (232) adopts a Lecia microscope.

5. The air-entrained fresh concrete bubble real-time observation device according to claim 1, characterized in that: A control panel for controlling the motor switch is installed on the outer side of the motor drive box (12).

6. An air-entrained fresh concrete bubble real-time observation method, characterized in that, It includes the following steps: Step S1: Use the real-time observation device for air-entrained fresh concrete bubbles described in any one of claims 1-5. Introduce the concrete into the concrete feed tank (13) through the feed inlet (131), then continue to add the air-entraining agent. Operate the control panel of the motor drive box (12) to start the motor, open the openable and closable sealing baffle (224), so that the turbine blade (14) rotates to fully stir the concrete and the air-entraining agent, and at the same time drives the concrete to flow through the pumping pipeline (11) and pass through the observation slot (22). Step S2: Drive the microscope body (232) to move to the center of the glass plate cover (221) by installing the slider (231). Set the time nodes and observe the air bubbles in the flowing concrete at the time nodes of 30 s, 1 min, 3 min, 5 min, 10 min, 15 min, and 30 min after the motor is turned on. Analyze and collect the bubble diameter size, bubble area size, the number of bubbles in different diameter ranges, and the proportion of bubbles in different diameter ranges at different time nodes through the Lecia microscopic system software and Image-pro image processing software of the computer, so as to obtain the characteristic data of the air-entrained fresh concrete bubbles in the flow state. Step S3: After the observation, remove the pipeline for cleaning. Open the lower part of the concrete feed tank (13) and wash the inner wall with clean water. Then re-introduce the concrete into the concrete feed tank (13) through the feed inlet (131), and continue to add the air-entraining agent. Operate the control panel of the motor drive box (12) to start the motor. When the concrete is transported through the observation slot (22), close the openable and closable sealing baffle (224) and turn off the motor. Step S4: Drive the microscope body (232) to move to the center of the glass plate cover (221) by installing the slider (231). Set the time nodes and observe the air bubbles in the stagnant concrete at the time nodes of 30 s, 1 min, 3 min, 5 min, 10 min, 15 min, and 30 min after the motor is turned off. Analyze and collect the bubble diameter size, bubble area size, the number of bubbles in different diameter ranges, and the proportion of bubbles in different diameter ranges at different time nodes through the Lecia microscopic system software and Image-pro image processing software of the computer, so as to obtain the characteristic data of the air-entrained fresh concrete bubbles in the stagnant state. Step S5: After the observation, remove the pipeline for cleaning. Open the lower part of the concrete feed tank (13) and wash the inner wall with clean water.

Images