Controllable variable concrete durability test equipment

Abstract

The utility model relates to the technical field of concrete material performance testing, and discloses variable-controllable concrete durability testing equipment, a movable driving assembly is composed of a bearing seat, a screw rod, a nut seat, a hand wheel, a sliding rail, a sliding block, a lower clamping plate, a bolt and an upper clamping plate, the lead screw is connected to the interior of the bearing seat, the nut seat is installed on the surface of the lead screw in a threaded mode, the hand wheel is fixedly installed on the side face of the lead screw, the sliding rail is fixedly installed in the sealing bin, and the sliding block is installed on the surface of the sliding rail in a sliding mode. According to the variable-controllable concrete durability test equipment, the extension and movement of the reinforced concrete column can be accurately controlled in a labor-saving manner through the arranged movement driving assembly, regular section observation is facilitated, the experiment efficiency and the data accuracy are improved, the carbonization rate can be intuitively judged by observing the number of rusted steel bars, and the experiment data acquisition process is simplified.

Description

Technical Field

[0001] This utility model relates to the field of concrete material performance testing technology, specifically to a concrete durability testing device with controllable variables. Background Technology

[0002] Carbonation of concrete can cause depassivation and corrosion of steel bars, leading to a series of adverse consequences such as reduced cross-sectional area of ​​steel bars, weakened bond between concrete and steel bars, and cracking of the concrete cover. Ultimately, this reduces the durability of concrete structures and shortens their service life.

[0003] Adding an appropriate amount of expansive agent has become an effective measure to improve the durability of concrete. Compared with traditional expansive agents, MgO expansive agents have advantages such as low hydration water demand, stable hydration products, and adjustable expansion performance. However, existing research on the influence of MgO on concrete durability is not systematic and in-depth enough. Therefore, those skilled in the art have taken MgO concrete of three strength grades (C30, C45, and C60) as research objects and systematically studied the carbonation resistance, compressive strength, carbonation shrinkage compensation, and chloride ion penetration resistance of MgO concrete under carbonation conditions. In order to more scientifically and accurately compare the carbonation rate of MgO concrete of different strength grades under the same carbonation environment, it is necessary to construct multiple sets of controllable variable experiments with concrete strength grade as the variable. Since the reinforced concrete components that closely resemble actual buildings are relatively large in size, it is necessary to periodically conduct cross-sectional observations and record data on reinforced concrete columns, and a constant high concentration of carbon dioxide is required in the experimental space. Traditional experimental equipment used for building materials cannot meet the practical needs. Utility Model Content

[0004] The purpose of this invention is to provide a concrete durability testing device with controllable variables to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a controllable variable concrete durability testing device, comprising a sealed chamber, a moving drive assembly, a guide wheel seat, a sealing component, a moving cutting assembly, and a carbon dioxide concentration control system. The moving drive assembly is disposed inside the sealed chamber, and a reinforced concrete column is disposed inside the moving drive assembly. The guide wheel seat is disposed inside the sealed chamber, the sealing component is disposed inside the sealed chamber, the moving cutting assembly is disposed outside the sealed chamber, and the carbon dioxide concentration control system is disposed outside the sealed chamber.

[0006] The moving drive assembly consists of a bearing housing, a lead screw, a nut seat, a handwheel, a slide rail, a slider, a lower clamping plate, bolts, and an upper clamping plate. The bearing housing is fixedly installed inside the sealed chamber, the lead screw is connected to the inside of the bearing housing, the nut seat is threaded onto the surface of the lead screw, the handwheel is fixedly installed on the side of the lead screw, the slide rail is fixedly installed inside the sealed chamber, the slider is slidably installed on the surface of the slide rail, and the lower clamping plate and the upper clamping plate are connected by a bolt in the middle.

[0007] Preferably, the mobile cutting assembly consists of dual guide rails, a trolley, a motor, a transmission belt, a support base, a rotating shaft, and a saw blade. The dual guide rails are installed outside the sealed chamber, the trolley is slidably installed on top of the dual guide rails, the motor is fixedly installed on top of the trolley, the transmission belt is located outside the motor, the support base is fixedly installed on top of the trolley, the rotating shaft is rotatably installed inside the support base, and the saw blade is fixedly installed on the side of the rotating shaft.

[0008] Preferably, the carbon dioxide concentration control system comprises a carbon dioxide concentration sensor, a programmable controller, a gas delivery pipe, an electrically controlled valve, and a carbon dioxide storage tank. The carbon dioxide concentration sensor is installed inside the sealed chamber. The input terminal of the programmable controller and the output terminal of the carbon dioxide concentration sensor are electrically connected. The gas delivery pipe is installed on the side of the sealed chamber. The electrically controlled valve is installed on the surface of the gas delivery pipe. The carbon dioxide storage tank is installed on the side of the gas delivery pipe.

[0009] Preferably, the guide wheel seat consists of a fixed seat and guide wheels. The fixed seat is fixedly installed inside the sealed chamber. A semi-circular groove is provided on the top of the fixed seat, and guide wheels are arranged circumferentially on the inner wall of the semi-circular groove. This arrangement allows the front end of the reinforced concrete column to be placed on the guide wheels, which can reduce the friction force of the reinforced concrete column moving back and forth.

[0010] Preferably, the sealing component consists of a fixed frame and barrier bristles. The fixed frame is fixedly installed inside the sealing chamber, and the barrier bristles are disposed inside the fixed frame. This arrangement allows the barrier bristles to tightly abut against the outer wall of the reinforced concrete column, blocking the flow of gas inside and outside the sealing chamber and ensuring the carbon dioxide concentration inside the sealing chamber.

[0011] Preferably, the reinforced concrete column has multiple parallel steel bars embedded inside, which are distributed in a spiral shape at equal intervals on the end face of the column. The distance between the side wall of each steel bar and the outer wall of the reinforced concrete column increases sequentially. This arrangement allows for an indirect determination of the degree of concrete carbonation by observing the number of corroded steel bars in the cross-section.

[0012] Preferably, a drive wheel is fixedly mounted on the output shaft of the motor, and a driven wheel is fixedly mounted on the surface of the rotating shaft. The drive wheel, the driven wheel, and the transmission belt are connected for transmission. When the motor is started, the rotating shaft can drive the saw blade to rotate under the action of the drive wheel, the driven wheel, and the transmission belt.

[0013] Preferably, the output terminal of the programmable controller and the input terminal of the electric control valve are electrically connected. A carbon dioxide concentration sensor is provided to monitor the carbon dioxide concentration in real time and transmit the data to the programmable controller. When the carbon dioxide concentration is lower than the start threshold, the electric control valve is opened to replenish carbon dioxide. When the concentration is higher than the stop threshold, the electric control valve is closed to realize closed-loop control of carbon dioxide concentration.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This controllable variable concrete durability testing equipment, through its set-up moving drive components, can effortlessly and precisely control the extension and movement of reinforced concrete columns, facilitating periodic cross-sectional observations, improving experimental efficiency and data accuracy. By observing the amount of corroded steel bars, the carbonation rate can be intuitively determined, simplifying the experimental data acquisition process.

[0016] This controllable variable concrete durability testing equipment uses a carbon dioxide concentration control system to monitor and adjust the carbon dioxide concentration in the sealed chamber in real time through closed-loop control. This provides a constant high-concentration carbonization environment for the experiment, ensuring that reinforced concrete columns of different strength grades can be compared under the same conditions, thus improving the reliability and comparability of the experimental results. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the lower clamping plate, bolts, and upper clamping plate structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the internal reinforcement distribution of the reinforced concrete column of this utility model;

[0020] Figure 4 This is a schematic diagram of the fixed base and guide wheel structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the fixing frame and the barrier brush structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the dual guides, trolley, and motor structure of this utility model;

[0023] Figure 7 This is a schematic diagram of the carbon dioxide concentration control system of this utility model.

[0024] In the diagram: 1. Sealed chamber; 2. Moving drive assembly; 201. Bearing seat; 202. Lead screw; 203. Nut seat; 204. Handwheel; 205. Slide rail; 206. Slider; 207. Lower clamping plate; 208. Bolt; 209. Upper clamping plate; 3. Reinforced concrete column; 4. Guide wheel seat; 401. Fixed seat; 402. Guide wheel; 5. Sealing component; 501. Fixed frame; 502. Barrier brush; 6. Moving cutting assembly; 601. Double guide rail; 602. Trolley; 603. Motor; 604. Transmission belt; 605. Support seat; 606. Rotating shaft; 607. Saw blade; 7. Carbon dioxide concentration control system; 701. Carbon dioxide concentration sensor; 702. Programmable controller; 703. Gas supply pipe; 704. Electrically controlled valve; 705. Carbon dioxide storage tank. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-7This utility model provides a technical solution: a controllable variable concrete durability testing device, including a sealed chamber 1, a moving drive assembly 2, a guide wheel seat 4, a sealing component 5, a moving cutting assembly 6, and a carbon dioxide concentration control system 7. The moving drive assembly 2 is located inside the sealed chamber 1, which achieves a basically sealed operating state. Carbon dioxide gas is filled inside to achieve and maintain a stable carbon dioxide concentration environment, enabling the reinforced concrete column 3 inside the sealed chamber 1 to rapidly carbonize and shorten the experimental cycle. The moving drive assembly 2 contains the reinforced concrete column 3, which has multiple parallel reinforcing bars embedded inside. The reinforcing bars are spirally and equidistantly distributed on the end face of the column, with the distance between the side wall of each reinforcing bar and the outer wall of the reinforced concrete column 3 increasing sequentially. This setup allows for indirect judgment of the degree of concrete carbonization by observing the number of corroded reinforcing bars in the cut surface. The guide wheel seat 4 is located inside the sealed chamber 1. Inside the sealed chamber 1, the guide wheel seat 4 consists of a fixed seat 401 and guide wheels 402. The fixed seat 401 is fixedly installed inside the sealed chamber 1. A semi-circular groove is provided on the top of the fixed seat 401. Guide wheels 402 are arranged circumferentially on the inner wall of the semi-circular groove. This arrangement allows the front end of the reinforced concrete column 3 to be placed on the guide wheels 402, which can reduce the friction force of the reinforced concrete column 3 moving back and forth. The sealing component 5 is set inside the sealed chamber 1. The sealing component 5 consists of a fixed frame 501 and a barrier brush 502. The fixed frame 501 is fixedly installed inside the sealed chamber 1. The barrier brush 502 is set inside the fixed frame 501. This arrangement allows the barrier brush to tightly abut against the outer wall of the reinforced concrete column 3, blocking the flow of gas inside and outside the sealed chamber 1 and ensuring the carbon dioxide concentration inside the sealed chamber 1. The moving cutting component 6 is set outside the sealed chamber 1. The carbon dioxide concentration control system 7 is set outside the sealed chamber 1.

[0027] The moving drive assembly 2 consists of a bearing housing 201, a lead screw 202, a nut seat 203, a handwheel 204, a slide rail 205, a slider 206, a lower clamping plate 207, a bolt 208, and an upper clamping plate 209. The bearing housing 201 is fixedly installed inside the sealed chamber 1. The lead screw 202 is connected to the inside of the bearing housing 201. The nut seat 203 is threaded onto the surface of the lead screw 202. The handwheel 204 is fixedly installed on the side of the lead screw 202. The slide rail 205 is fixedly installed inside the sealed chamber 1. The slider 206 is slidably installed on the surface of the slide rail 205. The lower clamping plate 207 and the upper clamping plate 209 are connected by the intermediate bolt 208.

[0028] The mobile cutting assembly 6 consists of a double guide rail 601, a trolley 602, a motor 603, a transmission belt 604, a support base 605, a rotating shaft 606, and a saw blade 607. The double guide rail 601 is installed outside the sealed chamber 1. The trolley 602 is slidably installed on the top of the double guide rail 601. The motor 603 is fixedly installed on the top of the trolley 602. The transmission belt 604 is located outside the motor 603. The support base 605 is fixedly installed on the top of the trolley 602. The rotating shaft 606 is rotatably installed inside the support base 605. A drive wheel is fixedly installed on the output shaft of the motor 603. A driven wheel is fixedly installed on the surface of the rotating shaft 606. The drive wheel, the driven wheel, and the transmission belt 604 are connected by a transmission. When the motor 603 is started, the rotating shaft 606 drives the saw blade 607 to rotate under the action of the drive wheel, the driven wheel, and the transmission belt 604. The saw blade 607 is fixedly installed on the side of the rotating shaft 606.

[0029] The carbon dioxide concentration control system 7 consists of a carbon dioxide concentration sensor 701, a programmable controller 702, a gas delivery pipe 703, an electrically controlled valve 704, and a carbon dioxide storage tank 705. The carbon dioxide concentration sensor 701 is installed inside the sealed chamber 1. The input terminal of the programmable controller 702 is electrically connected to the output terminal of the carbon dioxide concentration sensor 701. The gas delivery pipe 703 is installed on the side of the sealed chamber 1. The electrically controlled valve 704 is installed on the surface of the gas delivery pipe 703. The output terminal of the programmable controller 702 is electrically connected to the input terminal of the electrically controlled valve 704. The carbon dioxide concentration sensor 701 monitors the carbon dioxide concentration in real time and transmits the data to the programmable controller 702. When the carbon dioxide concentration is lower than the start threshold, the electrically controlled valve 704 is opened to add carbon dioxide. When the concentration is higher than the stop threshold, the electrically controlled valve 704 is closed to achieve closed-loop control of the carbon dioxide concentration. The carbon dioxide storage tank 705 is installed on the side of the gas delivery pipe 703.

[0030] In use, multiple sets of reinforced concrete columns 3 of different strength grades are arranged side by side, with the rear ends of the reinforced concrete columns 3 fixedly clamped between the lower clamping plate 207 and the upper clamping plate 209, and the front ends of the reinforced concrete columns 3 placed on the guide wheel 402. The front ends of the reinforced concrete columns 3 extend out of the sealed chamber 1 through the barrier brush 502. The carbon dioxide concentration inside the sealed chamber 1 can be controlled by the carbon dioxide concentration control system 7. By turning the handwheel 204, under the guidance of the slide rail 205 and the slider 206, the nut seat 203 can be moved on the surface of the lead screw 202. The movement causes the lower clamping plate 207, bolt 208, and upper clamping plate 209 to move synchronously, which in turn drives the front end of each group of reinforced concrete columns 3 to extend horizontally. The motor 603 is started, and under the action of the driving wheel, driven wheel, and transmission belt 604, the rotating shaft 606 drives the saw blade 607 to rotate, pushing the trolley 602 to move laterally. This allows a small section of the front end of each group of reinforced concrete columns 3 to be sawed off in sequence, thus forming a new cut surface. The amount of rusted steel bars in the cut surface can be observed, and the carbonization of reinforced concrete columns 3 of different strength grades can be recorded and compared to analyze indicators such as carbonization resistance.

Claims

1. A controllable variable concrete durability testing device, comprising a sealed chamber (1), a moving drive assembly (2), a guide wheel seat (4), a sealing component (5), a moving cutting assembly (6), and a carbon dioxide concentration control system (7), characterized in that: The mobile drive assembly (2) is located inside the sealed chamber (1), and a reinforced concrete column (3) is located inside the mobile drive assembly (2). The guide wheel seat (4) is located inside the sealed chamber (1), the sealing member (5) is located inside the sealed chamber (1), the mobile cutting assembly (6) is located outside the sealed chamber (1), and the carbon dioxide concentration control system (7) is located outside the sealed chamber (1). The moving drive assembly (2) consists of a bearing housing (201), a lead screw (202), a nut seat (203), a handwheel (204), a slide rail (205), a slider (206), a lower clamping plate (207), a bolt (208), and an upper clamping plate (209). The bearing housing (201) is fixedly installed inside the sealed chamber (1). The lead screw (202) is connected to the inside of the bearing housing (201). The nut seat (203) is threaded onto the surface of the lead screw (202). The handwheel (204) is fixedly installed on the side of the lead screw (202). The slide rail (205) is fixedly installed inside the sealed chamber (1). The slider (206) is slidably installed on the surface of the slide rail (205). The lower clamping plate (207) and the upper clamping plate (209) are connected by a bolt (208) in the middle.

2. The concrete durability testing equipment with controllable variables according to claim 1, characterized in that: The mobile cutting assembly (6) consists of a double guide rail (601), a trolley (602), a motor (603), a transmission belt (604), a support base (605), a rotating shaft (606), and a saw blade (607). The double guide rail (601) is installed outside the sealed chamber (1). The trolley (602) is slidably installed on the top of the double guide rail (601). The motor (603) is fixedly installed on the top of the trolley (602). The transmission belt (604) is located outside the motor (603). The support base (605) is fixedly installed on the top of the trolley (602). The rotating shaft (606) is rotatably installed inside the support base (605). The saw blade (607) is fixedly installed on the side of the rotating shaft (606).

3. The concrete durability testing equipment with controllable variables according to claim 1, characterized in that: The carbon dioxide concentration control system (7) consists of a carbon dioxide concentration sensor (701), a programmable controller (702), a gas delivery pipe (703), an electric control valve (704), and a carbon dioxide storage tank (705). The carbon dioxide concentration sensor (701) is installed inside the sealed chamber (1). The input terminal of the programmable controller (702) is electrically connected to the output terminal of the carbon dioxide concentration sensor (701). The gas delivery pipe (703) is installed on the side of the sealed chamber (1). The electric control valve (704) is installed on the surface of the gas delivery pipe (703). The carbon dioxide storage tank (705) is installed on the side of the gas delivery pipe (703).

4. The concrete durability testing equipment with controllable variables according to claim 1, characterized in that: The guide wheel seat (4) consists of a fixed seat (401) and guide wheels (402). The fixed seat (401) is fixedly installed inside the sealed chamber (1). A semi-circular groove is provided on the top of the fixed seat (401), and guide wheels (402) are arranged circumferentially on the inner wall of the semi-circular groove.

5. The concrete durability testing equipment with controllable variables according to claim 1, characterized in that: The sealing component (5) consists of a fixed frame (501) and a barrier brush (502). The fixed frame (501) is fixedly installed inside the sealing chamber (1), and the barrier brush (502) is disposed inside the fixed frame (501).

6. The concrete durability testing equipment with controllable variables according to claim 1, characterized in that: The reinforced concrete column (3) is embedded with multiple parallel steel bars. The steel bars are distributed in a spiral shape at equal intervals on the end face of the column. The distance between the side wall of each steel bar and the outer wall of the reinforced concrete column (3) increases sequentially.

7. The concrete durability testing equipment with controllable variables according to claim 2, characterized in that: A drive wheel is fixedly mounted on the output shaft of the motor (603), and a driven wheel is fixedly mounted on the surface of the rotating shaft (606). The drive wheel, the driven wheel, and the transmission belt (604) are connected for transmission.

8. The concrete durability testing equipment with controllable variables according to claim 3, characterized in that: The output terminal of the programmable controller (702) and the input terminal of the electric control valve (704) are electrically connected.

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