Concrete shrinkage test device

Abstract

The utility model relates to the technical field of concrete shrinkage test, and discloses a concrete shrinkage test device, which comprises a test bed, a test assembly is arranged on the top surface of the test bed, the test assembly comprises two driving seats which are respectively fixed on the top surface of the test bed close to the left side and the right side, and electric push rods are fixed on the top surfaces of the driving seats. A measuring plate is fixed to the telescopic end of the electric push rod, an electronic ruler is fixed to the top face of the driving base, and a pressure sensor penetrates through the front side of the measuring plate. When concrete shrinks, the pressure value of the pressure sensor is reduced, the measuring plate is driven to abut against and be attached to the side wall of the concrete until an experiment is finished, the electronic ruler records the advancing distance of the measuring plate, and the proportional relation that the concrete shrinks along with time is determined through a built-in timing program of the PLC. The device can more accurately test concrete, can more reliably predict the long-term performance of the concrete, and can formulate effective shrinkage control measures.

Description

TECHNICAL FIELD

[0001] The utility model relates to concrete shrinkage test technical field especially relates to a concrete shrinkage test device. BACKGROUND

[0002] Concrete shrinkage refers to the volume reduction phenomenon appearing in the initial setting or hardening process of concrete. In terms of construction engineering, the shrinkage of concrete causes tensile stress in the interior of the concrete, leading to the appearance of cracks and increasing the deformation of the concrete structural member, which has a significant impact on the load-carrying capacity, durability, and structural safety of the structural member. Therefore, it is necessary to detect the shrinkage of concrete test pieces before construction.

[0003] A concrete shrinkage test device (publication number: CN220552385U) has at least the following disadvantages: the device can only measure the size of the initial test and the size after shrinkage in actual use, cannot measure and time the concrete during the shrinkage process of the concrete, and cannot determine the shrinkage rate of the concrete, which affects the more reliable prediction of the long-term performance of the concrete in actual engineering and the development of effective shrinkage control measures. Therefore, the utility model is proposed. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art and provides a concrete shrinkage test device.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A concrete shrinkage test device includes a test bench, the top surface of the test bench is provided with a test assembly, the test assembly includes two drive seats fixed on the top surface of the test bench near the left and right sides respectively, the top surface of the drive seat is fixed with an electric push rod, the extension end of the electric push rod is fixed with a measuring plate, the top surface of the drive seat is also fixed with an electronic ruler, the output end of the electronic ruler is fixed with the rear side of the measuring plate, and the front side of the measuring plate is fixed with a pressure sensor.

[0007] As a further scheme of the utility model, the top surface of the test bench is fixed with a protective cover, the front side of the protective cover is fixed with a PLC controller, and the PLC controller is electrically connected with the electric push rod, the electronic ruler, and the pressure sensor.

[0008] As a further scheme of the utility model, a heating pipe is fixed inside the protective cover near the top surface, a humidifier is fixed on the rear side of the protective cover, the output pipe of the humidifier is fixed in communication with the rear side of the protective cover, a humidity sensor is fixed corresponding to the right side of the measuring plate, and the humidifier and the humidity sensor are electrically connected with the PLC controller.

[0009] As a further scheme of the utility model, the front side of the protective cover is hingedly connected with a sealing door, and one side of the sealing door is fixedly provided with a sealing strip.

[0010] As a further scheme of the utility model, the top surface of the driving seat is provided with two sliding grooves, and a limiting rod is slidably arranged in the sliding groove, and one end of the limiting rod is fixed to one side of the measuring plate.

[0011] As a further scheme of the utility model, the test bench is provided with a placing plate at the middle position of the top surface, and the placing plate is made of polyethylene.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] The measuring plate is driven to abut and fit the concrete side wall by the electric push rod, and the pressure sensor is subjected to a certain pressure, when the concrete shrinks, the pressure value of the pressure sensor becomes smaller, the electric push rod continues to drive the measuring plate to abut and fit the concrete side wall, so that the pressure value of the pressure sensor is maintained constant, until the experiment is finished, the electronic ruler continuously records the advancing distance of the measuring plate, and the built-in timing program of the PLC controller is used, so that the proportional relationship of the shrinkage of the concrete with the lapse of time is accurately determined, the key parameters such as the initial shrinkage rate, the final shrinkage value and the time constant of the concrete can be extracted, the experiment of the device on the concrete is more accurate, the long-term performance of the concrete is more reliably predicted, and effective shrinkage control measures are formulated. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 A three-dimensional structure schematic view of the concrete shrinkage test device is provided for the utility model;

[0015] Figure 2 A three-dimensional split structure schematic view of the concrete shrinkage test device is provided for the utility model;

[0016] Figure 3 A three-dimensional structure schematic view of the driving seat of the concrete shrinkage test device is provided for the utility model;

[0017] Figure 4 A three-dimensional sectional structure schematic view of the protective cover of the concrete shrinkage test device is provided for the utility model.

[0018] In the drawing: 1, test bench; 2, driving seat; 201, electric push rod; 202, measuring plate; 203, electronic ruler; 204, pressure sensor; 205, protective cover; 3, heating pipe; 301, humidifier; 302, humidity sensor; 303, sealing door; 4, sliding groove; 401, limiting rod; 5, placing plate. DETAILED DESCRIPTION

[0019] In order to make the technical means, creation features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0020] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "another end" and the like is the orientation or position relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "connection" and the like should be understood broadly, for example, "connection" can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] As shown in Figures 1-4 A concrete shrinkage test device, comprising a test table 1, the top surface of the test table 1 is provided with a test assembly, the test assembly comprises two drive seats 2 fixed respectively on the top surface of the test table 1 near the left and right sides, the top surface of the drive seat 2 is fixed with an electric push rod 201, the telescopic end of the electric push rod 201 is fixed with a measuring plate 202, the top surface of the drive seat 2 is also fixed with an electronic ruler 203, the output end of the electronic ruler 203 is fixed with the rear side of the measuring plate 202, and the front side of the measuring plate 202 is fixed with a pressure sensor 204.

[0023] As shown in Figures 2-4As shown, in this embodiment, the top surface of the test bench 1 is fixed with a protective cover 205, the front side of the protective cover 205 is fixed with a PLC controller, the PLC controller is electrically connected with the electric push rod 201, the electronic ruler 203 and the pressure sensor 204 respectively, the measurement plate 202 is driven to abut and fit the side wall of the concrete by starting the electric push rod 201, at this time, the pressure sensor 204 is synchronous with the side wall of the concrete, and the pressure value of the pressure sensor 204 is guaranteed to reach a predetermined value, when the concrete shrinks, the value of the pressure sensor 204 decreases, at this time, the PLC controller drives the measurement plate 202 to approach the side wall of the concrete, in this process, the electronic ruler 203 moves synchronously with the measurement plate 202 and transmits the length data of the movement to the PLC controller for recording, when the pressure value of the pressure sensor 204 reaches the predetermined value, the measurement plate 202 is stopped, so that the pressure value of the pressure sensor 204 is maintained constant, until the experiment is finished, the final shrinkage is determined by the movement distance of the electronic ruler 203 with the measurement plate 202, the length change of the electronic ruler 203 with the measurement plate 202 is recorded by the PLC controller during the timing process, it is worth noting that each movement of the electronic ruler 203 is recorded by the PLC controller, so that the shrinkage of the concrete at different times can be determined, and the shrinkage rate of the concrete can be obtained, so that the key parameters such as the initial shrinkage rate of the concrete, the final shrinkage value and the time constant can be finally extracted, so that the device is more accurate for the test of the concrete, and a more reliable prediction of the long-term performance of the concrete can be made, and effective shrinkage control measures can be developed.

[0024] As shown in the figure, Figures 2-4 In this embodiment, the inside of the protective cover 205 is fixed with a heating pipe 3 near the top surface, the rear side of the protective cover 205 is fixed with a humidifier 301, the output pipe of the humidifier 301 is fixed in communication with the rear side of the protective cover 205, the right side of the measurement plate 202 is fixed with a humidity sensor 302, the humidifier 301 and the humidity sensor 302 are electrically connected with the PLC controller, the heating pipe 3 and the humidifier 301 are started to change the temperature and humidity in the inside of the protective cover 205, which are detected by the temperature and humidity sensor 302, and are dynamically controlled by the PLC controller, so as to simulate the shrinkage rate and shrinkage of the concrete under different humidity and temperature conditions, and increase the accuracy of the test.

[0025] As shown in the figure, Figures 2-4 In this embodiment, the front side of the protective cover 205 is hingedly connected with a sealing door 303, one side of the sealing door 303 is fixed with a sealing strip, through the setting of the sealing door 303, the inside of the protective cover 205 can be kept relatively closed during the test, and the influence of the external wall environment on the concrete test is reduced.

[0026] As shown in the figure, Figures 2-4As shown, in the embodiment, the top surface of the driving base 2 is provided with two sliding grooves 4, and a limiting rod 401 is slidably arranged in the sliding groove 4, one end of the limiting rod 401 is fixed to one side of the measuring plate 202, and the limiting rod 401 can limit and support the measuring plate 202.

[0027] As shown in the drawings, Figures 2-4 As shown, in the embodiment, the top surface of the test bench 1 is provided with a placing plate 5 at the middle position, the placing plate 5 is made of polyethylene, the placing plate 5 is used to bear the concrete to be tested, and the polyethylene material of the placing plate 5 can prevent the concrete from being adhered to the equipment after being air dried and being difficult to clean.

[0028] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: in use, the concrete to be tested is placed on the top surface of the placing plate 5, then the placing plate 5 is placed at the middle position of the top surface of the test bench 1, at this time, the electric push rod 201 is started to drive the measuring plate 202 to abut and fit the side wall of the concrete, at this time, the pressure sensor 204 is synchronously abutted with the side wall of the concrete, and the pressure value of the pressure sensor 204 is ensured to reach a predetermined value, then the sealing door 303 is closed, at this time, the heating pipe 3 and the humidifier 301 are started to change the temperature and humidity inside the protective cover 205, and the temperature and humidity sensor 302 is used for detection, and the PLC controller is used for dynamic control, so that the shrinkage rate and shrinkage size of the concrete under different temperature and humidity conditions are simulated, when the shrinkage test of the concrete is started, the timing program of the PLC controller starts timing, when the concrete shrinks, the value of the pressure sensor 204 decreases, at this time, the electric push rod 201 driven by the PLC controller drives the measuring plate 202 to approach the side wall of the concrete, in this process, the electronic ruler 203 moves synchronously with the measuring plate 202 and transmits the moving data to the PLC controller for recording, when the pressure value of the pressure sensor 204 reaches the predetermined value, the driving of the measuring plate 202 is stopped, so that the pressure value of the pressure sensor 204 is maintained constant, until the experiment is finished, the final shrinkage amount is determined by the moving distance of the electronic ruler 203 with the measuring plate 202, and the length change of the electronic ruler 203 with the measuring plate 202 in the timing process of the PLC controller can determine the shrinkage amount of the concrete at different times, and the shrinkage rate of the concrete is obtained, so that the key parameters such as the initial shrinkage rate, the final shrinkage value and the time constant of the concrete can be finally extracted, the test of the device on the concrete is more accurate, the long-term performance of the concrete is more reliably predicted, and effective shrinkage control measures are formulated.

[0029] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A concrete shrinkage testing device comprising a testing table (1), characterized in that, The top surface of the test bench (1) is provided with a test assembly, the test assembly comprises two drive seats (2) fixed on the top surface of the test bench (1) near the left and right sides respectively, the top surface of the drive seat (2) is fixed with an electric push rod (201), the telescopic end of the electric push rod (201) is fixed with a measuring plate (202), the top surface of the drive seat (2) is further fixed with an electronic ruler (203), the output end of the electronic ruler (203) is fixed with the rear side of the measuring plate (202), and the front side of the measuring plate (202) is fixed with a pressure sensor (204).

2. A concrete shrinkage testing device according to claim 1, wherein The top surface of the test bench (1) is fixed with a protective cover (205), the front side of the protective cover (205) is fixed with a PLC controller, and the PLC controller is electrically connected with the electric push rod (201), the electronic ruler (203) and the pressure sensor (204) respectively.

3. A concrete shrinkage testing device according to claim 2, wherein The inside of the protective cover (205) is fixed with a heating pipe (3) near the top surface, the rear side of the protective cover (205) is fixed with a humidifier (301), the output pipe of the humidifier (301) is fixed in communication with the rear side of the protective cover (205), a humidity sensor (302) is fixed corresponding to the right side of the measuring plate (202), and the humidifier (301) and the humidity sensor (302) are electrically connected with the PLC controller.

4. A concrete shrinkage test device according to claim 3, wherein The front side of the protective cover (205) is hingedly connected with a sealing door (303), one side of the sealing door (303) is fixed with a sealing strip.

5. A concrete shrinkage test device according to claim 4, wherein The top surface of the drive seat (2) is provided with two sliding grooves (4), the inside of the sliding groove (4) is slidably provided with a limiting rod (401), and one end of the limiting rod (401) is fixed with one side of the measuring plate (202).

6. A concrete shrinkage test device according to claim 5, wherein The top surface of the test bench (1) is placed with a placing plate (5) at the middle position, and the placing plate (5) is made of polyethylene.

Images