CN115308209A - Device and method for real-time observation of air bubbles in freshly mixed concrete - Google Patents

Abstract

The invention discloses a real-time observation device for air-entraining fresh concrete bubbles, which comprises a circulating pumping mechanism and an experimental observation mechanism, wherein the circulating pumping mechanism comprises a motor driving box, a concrete feeding box and a pumping pipeline; the experimental observation mechanism comprises a computer, an observation base, an observation groove and a microscope assembly, wherein pumping pipeline butt-joint pipes for mounting pumping pipelines are arranged on the left side and the right side of the observation groove, and openable sealing baffles are arranged in the pumping pipeline butt-joint pipes; the invention also discloses a real-time observation method for air entraining fresh concrete bubbles, which comprises the following steps: s1, adopting the air entraining fresh concrete bubble real-time observation device; s2, observing concrete bubbles in flow; s3, removing the pipeline and cleaning; s4, observing the concrete bubbles in stagnation; and S5, dismantling the pipeline for cleaning, and having the advantages of simulating the transportation process of the high-air-content concrete pipeline, analyzing comprehensively and accurately, observing in time and the like.

Description

Air-entrained fresh concrete air bubble real-time observation device and method

technical field

The invention belongs to the technical field of concrete air bubble detection, and in particular relates to an air-entrained fresh concrete air bubble real-time observation device and method.

Background technique

After the air-entraining agent is added to the wet sprayed concrete for mining, the micro-bubbles are filled and accumulated in the cross-scale particle system in the form of "soft aggregate", and the change of the performance of the bubbles will affect the performance of the concrete.

At present, scholars at home and abroad mainly study the change law of the air content of concrete after the air is introduced into it. Since the concrete usually changes rapidly after air-entrainment, it is necessary to observe the air bubbles of the fresh concrete in time. The research on the change process of air bubble characteristics is not yet clear, so it is difficult to fully explain the pipeline transportation mechanism of wet shotcrete with air content for mining, so that high-quality pipelines cannot be accurately manufactured so that when the air-containing concrete is transported to the site through the pipeline, its air content meets high standards Air content.

Contents of the invention

The present invention aims to provide a device and method for real-time observation of bubbles in air-entrained fresh concrete, which can accurately analyze the change process of bubble characteristics of air-entrained fresh concrete in pipelines, and solve the lack of research on the change process of bubble characteristics of concrete in pipelines. Air Content Wet Shotcrete Pipeline Transport Mechanism Issues.

For this reason, the technical solution adopted in the present invention is: a real-time observation device for air-entraining freshly mixed concrete bubbles, including a circulating pumping mechanism and an experimental observation mechanism, and the circulating pumping mechanism includes a motor drive box, which is juxtaposed with the motor drive box Concrete feed box and pumping pipeline, the motor shaft in the motor drive box penetrates the concrete feed box, and the end of the shaft is equipped with turbine blades, the top of the concrete feed box is provided with a feed port, and the top of the concrete feed box and one side corresponding to the turbine blades are all provided with a pumping pipeline interface for the butt joint installation of the pumping pipeline; the experimental observation mechanism includes a computer, an observation base arranged from bottom to top, an observation tank and a microscope assembly, and the top of the observation tank The surface is equipped with a glass plate cover pressed by the left and right side pressure strips, and the left and right sides of the observation tank are provided with pumping pipeline butt joints for the installation of the pumping pipeline, so that the observation tank and the concrete feed box form a concrete transmission circuit through the pumping pipeline , the pumping pipeline butt joint is provided with a sealable baffle that can be opened and closed. The microscope assembly includes a mounting slider that can move back and forth along the observation slot and a microscope body located on the mounting slider. The microscope body and the computer are connected through a data cable. connect.

As a preference of the above solution, the joint of the pumping pipeline and the pumping pipeline is equipped with a fixed snap ring, and the joint of the pumping pipeline interface and the pumping pipeline is equipped with a pipeline fixing piece fixed by bolts, which is convenient for disassembly The pipeline is cleaned after pumping, and the structure design is reasonable.

It is further preferred that 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 is easy to operate.

It is further preferred that the main body of the microscope is a Lecia microscope with a high-quality optical system and clear images.

Further preferably, the motor shaft in the motor drive box is connected to the main shaft of the turbine blade through a key, the connection is stable, and the installation is convenient. Generate better driving force.

Further preferably, a control panel for controlling the motor switch is installed outside the motor drive box, which is convenient for manual operation.

It is further preferred that the computer is equipped with Lecia microscope system software and Image-pro image processing software for presenting pictures taken by the Lecia microscope, which can accurately obtain information about the volume of concrete bubbles, the diameter of bubbles, the number of bubbles in different diameter ranges and different diameters. The proportion of the number of bubbles in the range.

A method for real-time observation of air-entrained fresh concrete air bubbles, comprising the following steps:

Step S1, using the air-entraining fresh concrete air bubble real-time observation device mentioned above, import the concrete into the concrete feed box through the feed port, and then continue to add the air-entraining agent, operate the control panel of the motor drive box to start the motor, and open it. Close the sealing baffle, so that the turbine blades rotate to fully mix the concrete and air-entraining agent, and at the same time, drive the concrete to flow through the pumping pipeline and pass through the observation tank;

Step S2. Drive the microscope body to move to the center of the glass plate cover by installing the slider, set the time node, and observe the flowing concrete bubbles at the time node of 30s, 1min, 3min, 5min, 10min, 15min, and 30min after turning on the motor;

The diameter and area of bubbles, the number of bubbles in different diameter ranges and the proportion of bubbles in different diameter ranges are analyzed and collected at different time nodes through the computer's Lecia microscope system software and Image-pro image processing software, so as to obtain the flow Air-entrained fresh concrete bubble characteristic data in ;

Step S3. After the observation, remove the pipeline for cleaning, pull open the lower part of the concrete feeding box and wash the inner wall with clean water, then re-introduce the concrete into the concrete feeding box through the feeding port, and then continue to add air-entraining agent, and operate the motor to drive The control panel of the box starts the motor, and when the concrete is transported through the observation tank, the openable sealing baffle is closed and the motor is turned off;

Step S4, drive the main body of the microscope to move to the center of the glass plate cover by installing the slider, set the time node, and observe the stagnant concrete bubbles at the time node of 30s, 1min, 3min, 5min, 10min, 15min, and 30min after the motor is turned off;

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 nodes through computer Lecia microscope system software and Image-pro image processing software to obtain stagnation Air-entrained fresh concrete bubble characteristic data in ;

Step S5 , after the observation, the pipeline is removed for cleaning, and the lower part of the concrete feeding box is opened to wash the inner wall with clean water.

Beneficial effects of the present invention:

(1) It fills the gap in the market that lacks a comprehensive analysis of the bubble characteristics of air-entrained fresh concrete bubbles and the change process of bubble characteristics, and can comprehensively analyze the bubble characteristics (volume, shape, quantity) of air-entrained fresh concrete, and the research results are accurate. reliable.

(2) The observation tank and the concrete feed box form a concrete transmission circuit through the pumping pipeline. By opening the openable and closing sealing baffle, the pipeline transportation process of high air content concrete is simulated, and the pipeline transportation of high air content wet sprayed concrete for mining is clearly explained Mechanism, so as to manufacture high-quality transport concrete pipes, to ensure that high air content wet shotcrete can be transported to the construction site.

(3) There is an openable sealing baffle in the butt joint of the pumping pipeline. By closing the openable sealing baffle, the internal space of the observation tank is closed to facilitate the observation of the characteristic data of the concrete bubbles stagnant in the pipeline, so as to grasp when encountering When the wet shotcrete with high air content stagnates in the pipeline, the characteristic change data of the concrete bubbles can be analyzed comprehensively and accurately.

(4) Concrete is introduced into the concrete feed box through the feed port, and then continue to be mixed with air-entraining agent. The rotation of the turbine blade can fully mix the concrete and air-entraining agent to ensure high air content in the concrete, so that it is easier to observe the change of air bubbles , it can also provide the driving force for concrete transportation through the rotation of the turbine blades, killing two birds with one stone; because the air-entraining agent is mixed into the concrete feed box, the air bubble characteristics of the freshly mixed concrete can be observed in time, without the need for the concrete to be air-entrained. After mixing and pouring into the concrete feed box, it will not cause the change of initial air bubbles to be unable to be observed in time.

In summary, it has the advantages of simulating the transportation process of high-air-content concrete pipelines, comprehensive and accurate analysis, and timely observation.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a structural schematic diagram of the butt joint installation of the pumping pipeline interface and the pumping pipeline.

Fig. 3 is a structural schematic diagram of the butt joint installation of the pumping pipeline and the pumping pipeline.

Detailed ways

Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

As shown in Fig. 1-Fig. 3, an air-entrained fresh concrete bubble real-time observation device is composed of a circulating pumping mechanism 1 and an experimental observation mechanism 2.

The circulation pumping mechanism 1 is made up of a motor drive box 12 , a concrete feed box 13 and a pumping pipeline 11 parallel to the motor drive box 12 .

A control panel for controlling the motor switch is installed on the outside of the motor drive box 12 .

The motor shaft in the motor drive box 12 penetrates into the concrete feed box 13, and the end of the shaft is equipped with a turbine blade 14. The motor shaft in the motor drive box 12 is connected to the main shaft of the turbine blade 14 through a key, and the turbine blade 14 is in an arc with front and back warping. shape, and the angle between the front and rear warped edges is 15°-20°.

The bottom of the concrete feeding box 13 adopts a single-layer drawer structure.

The top of the concrete feeding box 13 is provided with a feeding port 131 , and the top of the concrete feeding box 13 and the side corresponding to the turbine blade 14 are provided with a pumping pipeline interface 132 for the butt joint installation of the pumping pipeline 11 .

The joint of the pumping pipeline interface 132 and the pumping pipeline 11 is equipped with a pipeline fixing member 112 fixed by bolts.

The experimental observation mechanism 2 is composed of a computer, an observation base 21 arranged from bottom to top, an observation slot 22 and a microscope assembly 23 .

The top surface of the viewing tank 22 is equipped with a glass plate cover 221 pressed by the left and right side pressure strips 222 .

The left and right sides of the observation tank 22 are provided with pumping pipeline butt joints 223 for the pumping pipeline 11 , so that the observation tank 22 and the concrete feed box 13 form a concrete transmission circuit through the pumping pipeline 11 .

The joint of the pumping pipeline 223 and the pumping pipeline 11 is provided with a fixed snap ring 111 , and an openable sealing baffle 224 is provided inside the pumping pipeline butt joint 223 .

The microscope assembly 23 is composed of a mounting slider 231 capable of moving back and forth along the observation slot 22 and a microscope main body 232 located on the mounting slider 231 .

The microscope main body 232 is connected with the computer through a data line, and the microscope main body 232 adopts a Lecia microscope.

The computer is installed with Lecia microscope system software and Image-pro image processing software for presenting images taken by Lecia microscope.

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

Step S1, using the above air-entraining fresh concrete air bubble real-time observation device, import the concrete into the concrete feed box 13 through the feed port 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 seal baffle 224 that can be opened and closed to make the turbine blade 14 rotate to fully stir the concrete and the air-entraining agent, and at the same time, drive the concrete to flow through the pumping pipeline 11 and pass through the observation tank 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 node, and observe the flow in the 30s, 1min, 3min, 5min, 10min, 15min, 30min time nodes after the motor is turned on Concrete bubbles.

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

Step S3, after the observation, remove the pipeline for cleaning, pull the lower part of the concrete feed box 13 and wash the inner wall with clean water, then re-introduce the concrete into the concrete feed box 13 through the feed port 131, and then continue to add the air-entraining agent, Operate the control panel of the motor drive box 12 to start the motor, close the openable sealing baffle 224 after the concrete transportation passes through the observation slot 22, and turn off the motor.

Step S4, drive the microscope main body 232 to move to the center of the glass plate cover 221 by installing the slider 231, set the time node, and observe the time nodes that are stagnant at 30s, 1min, 3min, 5min, 10min, 15min, and 30min after the motor is turned off. Concrete bubbles.

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 nodes through computer Lecia microscope system software and Image-pro image processing software to obtain stagnation Air-entrained fresh concrete bubble characteristic data in .

Step S5 , after the observation, the pipeline is removed for cleaning, and the lower part of the concrete feeding box 13 is opened to wash the inner wall with clean water.

Claims (8)

1. The utility model provides an air entrainment fresh concrete bubble real-time observation device which characterized in that: the concrete circulating and conveying device comprises a circulating pumping mechanism (1) and an experiment observation mechanism (2), wherein the circulating pumping mechanism (1) comprises a motor driving box (12), a concrete feeding box (13) and a pumping pipeline (11), the concrete feeding box (13) is parallel to the motor driving box (12), a motor rotating shaft in the motor driving box (12) penetrates into the concrete feeding box (13), a turbine blade (14) is installed at the end part of the rotating shaft, a feeding hole (131) is formed in the top of the concrete feeding box (13), and a pumping pipeline interface (132) for butt joint installation of the pumping pipeline (11) is arranged on the top of the concrete feeding box (13) and one side corresponding to the turbine blade (14); experiment observation mechanism (2) include the computer, from down up observation base (21), observation groove (22) and microscope subassembly (23) that set up, observation groove (22) top surface is equipped with glass plate cover (221) of pushing down through left and right sides side strip (222), the side is equipped with pump sending pipeline butt joint pipe (223) that supplies pump sending pipeline (11) to install about observation groove (22), makes observation groove (22) and concrete feed box (13) form concrete transmission return circuit through pump sending pipeline (11), be equipped with openable and closable seal baffle (224) in pump sending pipeline butt joint pipe (223), microscope subassembly (23) are including installing slider (231) that can follow observation groove (22) back-and-forth movement and being located microscope main part (232) on installing slider (231), and microscope main part (232) pass through the data line with the computer and are connected.

2. The real-time observation device for air-entrained fresh concrete bubbles according to claim 1, characterized in that: the joint of the pumping pipeline butt joint pipe (223) and the pumping pipeline (11) is provided with a fixing clamp ring (111), and the joint of the pumping pipeline joint (132) and the pumping pipeline (11) is provided with a pipeline fixing piece (112) which is fixed through bolt tightening.

3. The real-time observation device for air entraining fresh concrete bubbles as claimed in claim 1, characterized in that: the lower part of the concrete feeding box (13) adopts a single-layer drawer type structure.

4. The real-time observation device for air entraining fresh concrete bubbles as claimed in claim 1, characterized in that: the microscope main body (232) adopts a Lecia microscope.

5. The real-time observation device for air-entrained fresh concrete bubbles according to claim 1, characterized in that: the motor rotating shaft in the motor driving box (12) is connected with the main shaft of the turbine blade (14) through a key, the turbine blade (14) is in an arc shape with front and back raised edges, and the included angle between the front and back raised edges is 15-20 degrees.

6. The real-time observation device for air-entrained fresh concrete bubbles according to claim 1, characterized in that: and a control panel for controlling a motor switch is arranged on the outer side of the motor driving box (12).

7. The real-time observation device for air-entrained fresh concrete bubbles according to claim 1, characterized in that: the computer is provided with Lecia microscope system software and Image-pro Image processing software for displaying Lecia microscope shooting pictures.

8. A method for observing air entraining fresh concrete bubbles in real time is characterized by comprising the following steps:

s1, adopting the air entraining fresh concrete bubble real-time observation device of any one of claims 1 to 7, introducing concrete into the concrete feeding box (13) through the feeding port (131), then continuing to incorporate the air entraining agent, operating a control panel of the motor driving box (12) to start a motor, opening an openable sealing baffle (224), and enabling the turbine blades (14) to rotate to fully stir the concrete and the air entraining agent and simultaneously drive the concrete to flow through the pumping pipeline (11) and pass through the observation groove (22);

s2, driving a microscope main body (232) to move to the center of a glass plate cover (221) through an installation sliding block (231), setting time nodes, and observing concrete bubbles in flow at the time nodes of 30S, 1min, 3min, 5min, 10min, 15min and 30min after a motor is started;

analyzing and collecting the diameter size of bubbles, the area size of the bubbles, the number of the bubbles in different diameter ranges and the proportion of the bubbles in the different diameter ranges at different time nodes through Lecia microsystem software and Image-pro Image processing software of a computer, thereby obtaining characteristic data of the bubbles of the air entraining fresh concrete in the flow;

s3, removing the pipeline for cleaning after the observation is finished, pulling open the lower part of the concrete feeding box (13) to wash and clean the inner wall of the concrete feeding box through clear water, then introducing the concrete into the concrete feeding box (13) through the feeding hole (131), continuing to mix the air entraining agent, operating a control panel of the motor driving box (12) to start a motor, closing the openable sealing baffle (224) after the concrete is transported through the observation tank (22), and closing the motor;

s4, driving a microscope main body (232) to move to the center of a glass plate cover (221) through an installation sliding block (231), setting time nodes, and observing concrete bubbles in stagnation at the time nodes of 30S, 1min, 3min, 5min, 10min, 15min and 30min after a motor is turned off;

analyzing and collecting the diameter size of bubbles, the area size of the bubbles, the number of the bubbles in different diameter ranges and the proportion of the bubbles in the different diameter ranges at different time nodes through Lecia microsystem software and Image-pro Image processing software of a computer, thereby obtaining the characteristic data of the air entraining fresh concrete bubbles in stagnation;

and S5, removing the pipeline for cleaning after the observation is finished, and pulling open the lower part of the concrete feeding box (13) to wash and clean the inner wall through clear water.

Images