Concrete compression test device capable of simulating freeze-thaw cycle

Abstract

The invention relates to a concrete compression test device capable of simulating freeze-thaw cycle. The concrete compression test device comprises a test box, a loading system, a water supply and drainage system, a temperature control system and a data control system, the test box is composed of an environment box, a base, a bearing platform, a test piece box, stand columns and a cross beam. Grid doors are arranged on the four sides of the test piece box to achieve water contact. The loading system applies pressure to the test piece through a jack, a hydraulic piston, a hydraulic pipe and a loading plate, and a pressure collector monitors the load in real time; the water supply and drainage system comprises a water tank, a water inlet / outlet pipe, a valve, a water pump and a water level sensor; the temperature control system adjusts the temperature in the environment box through a temperature control box, a refrigeration / heating pipeline connected in parallel, an axial flow fan and a temperature sensor, and simulates freeze-thaw cycle; the data control system integrates data of each sensor through a computer and automatically regulates and controls test parameters. The device can simulate water level change, freeze-thaw cycle and mechanical load at the same time, and is suitable for durability and bearing capacity tests of components such as water conservancy project dam bodies and building foundations.

Description

Technical Field

[0001] The invention relates to the field of concrete compression test in civil engineering and the field of freeze-thaw cycle test, and in particular to a concrete compression test device capable of simulating freeze-thaw cycles. Background Art

[0002] Concrete materials are affected by numerous factors during construction and use, which can reduce the durability and lifespan of the structure. Freeze-thaw cycles are the primary factor impacting concrete durability. The internal pore water in concrete expands upon freezing and relaxes upon dissolution, generating fatigue stress and causing gradual erosion and damage to the concrete. Freeze-thaw cycles also reduce concrete strength, impacting the structure's bearing capacity and stability. In cold regions of my country, the foundations of civil buildings and the dams of hydraulic projects are inevitably subject to freeze-thaw cycles, presenting significant challenges to project design, construction, and maintenance.

[0003] At present, engineers mainly use model tests and numerical simulations to study the effects of freeze-thaw cycles on the strength of concrete materials. Model tests create more reasonable conditions and obtain more realistic data, so they are more widely used in research. However, there are several issues that need to be noted during the test: (1) The influence of groundwater levels needs to be considered in the engineering environment. Changes in groundwater levels will affect the contact area of ​​the main structure during freeze-thaw cycles. (2) During the test, temperature changes and the duration of freeze-thaw cycles need to be strictly controlled to more realistically simulate the actual situation on site. (3) The environments of structural components that suffer freeze-thaw damage in water conservancy projects and construction projects are different. The dam body is mainly subjected to the action of water, while the building foundation is mainly subjected to the action of soil pressure and superstructure load. The test conditions provided by different types of structural components are very different. Summary of the Invention

[0004] In view of the shortcomings of current technical equipment, a concrete compression test device that can simulate freeze-thaw cycles is provided, which has a simple structure, reasonable design, comprehensive functions and easy assembly.

[0005] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention provides a concrete compression test device capable of simulating freeze-thaw cycles. The device comprises a test chamber, a loading system, a water supply and drainage system, a temperature control system, and a data control system. The test chamber provides a test environment for concrete specimens; the loading system applies pressure to the concrete specimens; the water supply and drainage system regulates the water volume within the chamber; the temperature control system regulates the chamber temperature; and the data manipulation system reads test data and modifies test parameters to change test conditions.

[0007] Furthermore, the test chamber is composed of an environmental chamber, an environmental chamber base, a support platform, a specimen box, columns, and beams.

[0008] Furthermore, the test specimen box is located inside the environmental chamber and is connected to the base via high-strength bolts. The environmental chamber and the base are placed on the base of the environmental chamber and are connected via high-strength bolts.

[0009] The test box is provided with doors in four horizontal directions, and the door leaves are composed of horizontal and vertical steel strips.

[0010] The environmental chamber is equipped with a sealed door. When the door is closed, the water in the chamber is prevented from leaking out. The sealed door is made of transparent material, so that the destruction process of the test piece can be observed during the test.

[0011] Furthermore, the loading system is composed of a jack, a hydraulic piston, a pressure collector, a hydraulic pipe, and a loading plate.

[0012] Furthermore, the jack is connected to the beam, column and environmental chamber in sequence through high-strength bolts.

[0013] The top of the environmental box is provided with a hole, the diameter of the hole is larger than the diameter of the hydraulic pipe, the center of the hole is aligned with the bottom center of the hydraulic pipe, the hydraulic pipe passes through the top hole of the environmental box and is connected to the loading plate.

[0014] The hydraulic pipe contains hydraulic oil, the hydraulic piston is placed in the hydraulic pipe and connected to the jack. The induction joint of the pressure sensor is placed in the hydraulic pipe, and the pressure sensor is connected to the computer through a wire.

[0015] Furthermore, the water supply and drainage system is composed of a water tank, a drain pipe, a water inlet pipe, a water inlet pipe valve, a water inlet pump, a drain pipe valve, a drain pump, a water tank motor, and a water level sensor.

[0016] Furthermore, a drain pipe valve and a drain pump are installed on the drain pipe, and a water inlet pipe valve and a water inlet pump are installed on the water inlet pipe.

[0017] The water level sensor is installed on the top of the environmental box and is connected to the computer through a wire.

[0018] The water inlet pipe valve, water inlet pump, drain pipe valve and drain pump are connected to the water tank motor through wires.

[0019] Furthermore, the temperature control system is composed of a temperature control box, an exhaust pipe, an air inlet pipe, an air control valve, an air refrigerator, an air heater, an axial flow fan, a temperature control box motor, and a temperature sensor.

[0020] Furthermore, the temperature control box is connected to the environmental box through an exhaust pipe and an air inlet pipe.

[0021] The air inlet pipe is formed by two pipes connected in parallel, and the two pipes are respectively connected in series with the air refrigerator and the air heater.

[0022] The air inlet pipe is connected to the axial flow fan, and the axial flow fan is connected to the temperature control box motor.

[0023] An air control valve is installed on the exhaust pipe.

[0024] The wind control valve, air refrigerator and air heater are respectively connected to the temperature control box motor through wires.

[0025] The temperature control box motor is connected to the computer through a wire.

[0026] The temperature sensor is installed on the top of the environmental box and is connected to the wind control valve, air cooler and air heater through wires.

[0027] Furthermore, the data control system is composed of computers and wires.

[0028] Furthermore, the test box, water supply and drainage system, temperature control system, and data control system are respectively connected to the base plate through high-strength bolts.

[0029] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0030] The present invention can achieve freezing and melting of water by adjusting the water level height in the box and changing the temperature in the box, simulate the destruction process of dam bodies and pier structures in water conservancy projects and bridge projects under the action of freeze-thaw cycles and analyze their stability.

[0031] The present invention can simulate the destruction process of load-bearing components such as foundations and columns of civil buildings under freeze-thaw cycles under the action of upper loads and analyze their bearing capacity by adjusting the pressure of the loading system and changing the temperature in the box.

[0032] The present invention can analyze the strength index of concrete materials under the action of freeze-thaw cycles by continuously changing the temperature of the box body while the box body is immersed in water, draining the water body after reaching the number of freeze-thaw cycles, and loading the test piece.

[0033] In short, this invention can complete freeze-thaw cycle strength tests of various structural components through different combinations of equipment, reduce resource waste and obtain good test results.

[0034] The present invention has the following beneficial effects:

[0035] The present invention is adopted.

[0036] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a schematic diagram of the structure of the present invention;

[0039] Figure 2 Schematic diagram of the test chamber;

[0040] Figure 3 Schematic diagram of the loading system;

[0041] Figure 4 Schematic diagram of water supply and drainage system;

[0042] Figure 5 Schematic diagram of the temperature control system;

[0043] Figure 6 This is a schematic diagram of wire connection.

[0044] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0045] 1—Environmental chamber, 2—Environmental chamber base, 3—Pedestal, 4—Test specimen chamber, 5—Column, 6—Beam, 7—Jack, 8—Hydraulic piston, 9—Pressure collector, 10—Hydraulic pipe, 11—Loading plate, 12—Water tank, 13—Drain pipe, 14—Water inlet pipe, 15—Drain pipe valve, 16—Drain pump, 17—Water inlet pipe valve, 18—Water inlet pump, 19—Water tank motor, 20—Water level sensor, 21—Temperature control box, 22—Exhaust pipe, 23—Air inlet pipe, 24—Air control valve, 25—Air cooler, 26—Air heater, 27—Axial fan, 28—Temperature control box motor, 29—Temperature sensor, 30—Computer, 31—Wire. DETAILED DESCRIPTION

[0046] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0048] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0049] Example 1

[0050] See also Figures 1-6 As shown, the present invention is a concrete compression test device capable of simulating freeze-thaw cycles. It includes a test chamber, a loading system, a water supply and drainage system, a temperature control system, and a data control system. The test chamber comprises an environmental chamber 1, an environmental chamber base 2, a bearing platform 3, a specimen chamber 4, columns 5, and a crossbeam 6. The loading system comprises a jack 7, a hydraulic piston 8, a pressure collector 9, a hydraulic pipe 10, and a loading plate 11. The water supply and drainage system comprises a water tank 12, a drain pipe 13, an inlet pipe 14, a drain pipe valve 15, a drain pump 16, an inlet pipe valve 17, an inlet pump 18, a water tank motor 19, and a water level sensor 20. The temperature control system comprises a temperature control box 21, an exhaust pipe 22, an inlet pipe 23, an air control valve 24, an air cooler 25, an air heater 26, an axial fan 27, a temperature control box motor 28, and a temperature sensor 29. The data control system comprises a computer 30 and wires 31.

[0051] Example 2

[0052] Based on Example 1, a specimen chamber 4 is installed inside an environmental chamber 1 and connected to a cap 3 via high-strength bolts. The environmental chamber 1 and cap 3 are placed on an environmental chamber base 2 and connected via high-strength bolts. The specimen chamber 4 is used to house concrete specimens, while the environmental chamber 1 simulates the environmental conditions experienced by concrete structures.

[0053] Example 3

[0054] Based on Example 2, environmental chamber 1 is equipped with a sealed door. When closed, it prevents water from leaking out of the chamber. The sealed door is made of transparent material, allowing observation of the specimen's destruction process during the test. Specimen chamber 4 is equipped with doors in four horizontal directions. The door panels are constructed from horizontal and vertical steel slats. Uniform holes are created between the slats to allow water to enter specimen chamber 4 from environmental chamber 1.

[0055] Example 4

[0056] Based on Example 1, the jack 7 is sequentially connected to the crossbeam 6, column 5, and environmental chamber 1 using high-strength bolts. The jack 7 is welded to the hydraulic piston 8, which is then placed in a hydraulic pipe 10. The hydraulic pipe 10 is filled with hydraulic oil and connected to a loading plate 11. The pressure generated by the jack 7 is transmitted through the hydraulic piston 8 and the hydraulic oil to the loading plate 11, causing the loading plate 11 to apply pressure to the concrete specimen.

[0057] Example 5

[0058] Based on Example 4, the loading plate 11 is located inside the environmental chamber 1, and a hole with a diameter larger than the diameter of the hydraulic pipe 10 is set on the top of the environmental chamber 1, and the center of the hole is aligned with the center of the bottom of the hydraulic pipe 10, so that the hydraulic pipe 10 can pass through the environmental chamber 1 and be connected to the loading plate 11.

[0059] Example 6

[0060] Based on Example 4, a pressure collector 9 is placed inside the hydraulic pipe 10. The pressure collector 9 is connected to the jack 7 and the computer 30 via a wire 31. The computer 30 can monitor the pressure generated by the loading plate 11 in real time through the pressure collector 9 and adjust the load of the jack 7 accordingly.

[0061] Example 7

[0062] Based on Example 1, the drain valve 15, drain pump 16, inlet valve 17, and inlet pump 18 are installed on the drain pipe 13 and inlet pipe 14, respectively, and are connected to the water tank motor 19 via a wire 31. A water level sensor 20 is installed at the top of the environmental chamber 1 and is connected to a computer 30 via a wire 31. The water tank motor 19 is also connected to the computer 30 via a wire. The water level measured by the water level sensor 20 is used by the computer 30 to control the opening and closing of the drain valve 15, drain pump 16, inlet valve 17, and inlet pump 18, thereby achieving water supply and drainage within the environmental chamber.

[0063] Example 8

[0064] On the basis of Example 1, the temperature control box 21 is connected to the environmental box 1 through the exhaust pipe 22 and the air inlet pipe 23. The axial flow fan 27 is connected to the temperature control box motor 28.

[0065] Example 9

[0066] Based on Example 8, the air inlet duct 23 is composed of two parallel pipes, which are respectively connected in series to an air cooler 25 and an air heater 26. The air inlet duct 23 is connected to an axial flow fan 27. An air control valve 24 is installed on the exhaust duct 22 to adjust the exhaust capacity of the exhaust duct 22.

[0067] Example 10

[0068] On the basis of Example 1, the temperature sensor 29 is installed on the top of the environmental chamber 1 and is connected to the wind control valve 24 , the air cooler 25 and the air heater 26 through wires 31 .

[0069] Example 11

[0070] Based on Example 10, the air control valve 24, air chiller 25, and air heater 26 are each connected to a temperature control box motor 28 via a wire 31. The temperature control box motor 28 is also connected to a computer 30 via a wire 31. The temperature of the environmental chamber is obtained by a temperature sensor 29, and the computer 30 controls the opening and closing of the air chiller 25 and air heater 26 to adjust the temperature within the environmental chamber and implement a freeze-thaw cycle.

[0071] Example 12

[0072] On the basis of Example 1, the test box, water supply and drainage system, temperature control system, and data control system are respectively connected to the base plate 32 by high-strength bolts.

[0073] The operating principle of the present invention is as follows: the loading system, water supply and drainage system, and temperature control system are each connected to the test chamber. The pressure collector 9, water level sensor 20, and temperature sensor 29 are each connected to a computer 30 via a wire 31, and the measured data is transmitted to the computer 30. In the loading system, the jack 7 is connected to the pressure collector 9 and the computer 30 via a wire 31. The computer 30 adjusts the load generated by the jack 7 based on the data feedback from the pressure collector 9. The jack 7 pushes the hydraulic piston 8 to apply the load to the hydraulic oil in the hydraulic pipe 10. Under the pressure of the hydraulic piston 8, the hydraulic oil transmits pressure to the loading plate 11, causing the loading plate 11 to apply pressure to the concrete specimen. The data from the pressure collector 9 and pressure conversion can be used to obtain the pressure value acting on the concrete specimen at the time of failure. In the water supply and drainage system, the water inlet pipe 14 and the water outlet pipe 13 are each connected to the environmental chamber 1 and are equipped with a water inlet valve 17, a water inlet pump 18, a water outlet valve 15, and a water outlet pump 16. The water inlet valve 17, water inlet pump 18, drain valve 15, and drain pump 16 are connected to the water tank motor 19 and computer 30 via wires 31, respectively. Computer 30 controls the water tank motor 19 based on data fed back by the water level sensor 20, opening the water inlet valve 17, water inlet pump 18, or the drain valve 15 and drain pump 16 to ensure water flow between the water tank 12 and the environmental chamber 1, achieving water supply and drainage. In the temperature control system, an exhaust pipe 22 is connected to the environmental chamber 1 at one end and to the outside environment through the temperature control chamber 21 at the other end. An air control valve 24 is installed on the exhaust pipe 22 and is connected to the temperature control chamber motor 28 and computer 30 via wires 31. Air is discharged from the environmental chamber 1 under the control of computer 30. The air inlet pipe 23 is composed of two parallel ventilation ducts, each connected to an air chiller 25 and an air heater 26. One end of the air inlet pipe 23 is connected to the environmental chamber 1, and the other end is connected, in sequence, to an axial fan 27, a temperature control chamber motor 28, and computer 30. The computer controls the temperature control box motor 28, turning on the axial flow fan 27, allowing the air inlet pipe 23 to discharge air into the environmental chamber 1. Based on the data fed back by the temperature sensor 29, the computer 30 controls the air chiller 25 or air heater 26 on and off, and sets the temperature of the air in the air inlet pipe 23, thereby regulating the temperature in the environmental chamber 1 and achieving a freeze-thaw cycle.

[0074] Application Example 1 Concrete compressive strength test under freeze-thaw cycle conditions

[0075] First, place the concrete specimen in the specimen chamber 4 and close the chamber door. Then, power on the computer 30. In the loading system software, adjust the height of the lifting sleeve of the jack 7 so that the loading plate 11 contacts the concrete specimen, secure the specimen, and close the environmental chamber door 1.

[0076] The water level control system software sets a control level, starts the water tank motor 19, opens the water inlet valve 17 and the water pump 18, and fills the environmental chamber 1 with water from the water tank 12. When the water level in the environmental chamber 1 reaches the control level, the water level sensor 20 transmits a signal to the computer 30, and the water supply and drainage control system software controls the water inlet valve 17 and the water pump 18 to close.

[0077] The freezing temperature value and melting temperature value of the water body in the environmental box 1, as well as the freeze-thaw cycle period and number are set in the temperature control system software. Start the temperature control box motor 28, turn on the axial flow fan 27, and turn on the air refrigerator 25 at the same time. Cold air will be blown into the environmental box 1 from the air inlet pipe 23. When the temperature drops to a specified value, the temperature sensor 29 will feed back the information to the computer 30, and the environmental box 1 will maintain a constant temperature for a certain period of time. When the specified time is reached, the air refrigerator 25 will be turned off, the air heater 26 will be turned on, and hot air will be blown into the environmental box 1 from the air inlet pipe 23. When the temperature rises to a specified value, the frozen water body begins to melt, the temperature sensor 29 will feed back the information to the computer 30, and the environmental box 1 will maintain a constant temperature for a certain period of time. When the specified time is reached, the air heater 26 will be turned off, the air refrigerator 25 will be turned on again, and the above process will be repeated to reach the specified number of cycles. When the air pressure in the environmental box 1 is too high, the temperature sensor 29 can feed back information to the computer 30 , and the computer 30 will open the air control valve 20 to allow the gas in the environmental box 1 to be discharged through the exhaust pipe 22 .

[0078] After the freeze-thaw cycle is complete, the drainage control system software opens drain valve 15 and drain pump 16, draining the water in environmental chamber 1 back to water tank 12. Once the water level sensor 20 detects the water level has dropped to a specified value, computer 30 controls the closure of drain valve 15 and drain pump 16. The temperature control system software also shuts down axial fan 27, air cooler 25, and air heater 26. The air pressure in environmental chamber 1 is then restored to its initial state via exhaust pipe 22.

[0079] The loading system software causes jack 7 to generate a vertical load, pushing loading plate 11 downward and compressing the concrete specimen. Pressure collector 9 then feeds information back to computer 30. When the force of loading plate 11 exceeds the compressive bearing capacity of the concrete specimen, the specimen fails under pressure, at which point computer 30 provides an indicator of the concrete's compressive strength.

[0080] Application Example 2: Monitoring test of stress state of dam body in water conservancy project under freeze-thaw cycle conditions

[0081] First, attach strain gauges to the interior of the dam model and connect them to the strain gauges. The wiring can be routed through the top opening of the environmental chamber 1. Place the dam model in the specimen chamber 4 and close the door. Turn on the power and computer 30. In the loading system software, adjust the height of the lifting sleeve of the jack 7 so that the loading plate 11 contacts the specimen. Secure the dam model and close the door of the environmental chamber 1.

[0082] The water level control system software sets a control level, starts the water tank motor 19, opens the water inlet valve 17 and the water pump 18, and fills the environmental chamber 1 with water from the water tank 12. When the water level in the environmental chamber 1 reaches the control level, the water level sensor 20 transmits a signal to the computer 30, and the water supply and drainage control system software controls the water inlet valve 17 and the water pump 18 to close.

[0083] The freezing temperature value and melting temperature value of the water body in the environmental box 1, as well as the freeze-thaw cycle period and number are set in the temperature control system software. Start the temperature control box motor 28, turn on the axial flow fan 27, and turn on the air refrigerator 25 at the same time. Cold air will be blown into the environmental box 1 from the air inlet pipe 23. When the temperature drops to a specified value, the temperature sensor 29 will feed back the information to the computer 30, and the environmental box 1 will maintain a constant temperature for a certain period of time. When the specified time is reached, the air refrigerator 25 will be turned off, the air heater 26 will be turned on, and hot air will be blown into the environmental box 1 from the air inlet pipe 23. When the temperature rises to a specified value, the frozen water body begins to melt, the temperature sensor 29 will feed back the information to the computer 30, and the environmental box 1 will maintain a constant temperature for a certain period of time. When the specified time is reached, the air heater 26 will be turned off, the air refrigerator 25 will be turned on again, and the above process will be repeated to reach the specified number of cycles. When the air pressure in the environmental box 1 is too high, the temperature sensor 29 can feed back information to the computer 30 , and the computer 30 will open the air control valve 20 to allow the gas in the environmental box 1 to be discharged through the exhaust pipe 22 .

[0084] During the freeze-thaw cycle, the stress state of the dam model is analyzed through data monitored by strain gauges.

[0085] Application Example 3: Monitoring test of stress state of civil building foundation under freeze-thaw cycle conditions

[0086] First, attach strain gauges to the interior of the foundation model and connect them to the strain gauges. The wiring can be routed through the opening at the top of the environmental chamber 1. Place the foundation model in the specimen chamber 4. Add the appropriate soil and compact it to simulate the surrounding environment of the foundation. Close the chamber door 4. Turn on the power and computer 30. In the loading system software, adjust the height of the lifting sleeve of the jack 7 so that the loading plate 11 contacts the specimen. Secure the specimen and close the environmental chamber door 1.

[0087] In the loading system software, the jack 7 generates a vertical load, pushing the loading plate 11 downward and compressing the foundation model. The pressure collector 9 feeds this information back to the computer 30. By adjusting the jack 7, the pressure generated by the loading plate 11 reaches a specified value, simulating the load on the upper part of the foundation.

[0088] The freezing and melting temperatures, as well as the number of freeze-thaw cycles, are set in the temperature control system software. The temperature control box motor 28 is activated, the axial flow fan 27 is turned on, and the air chiller 25 is simultaneously turned on. Cold air is blown into the environmental chamber 1 through the air inlet duct 23. When the temperature drops to a specified value, the temperature sensor 29 feeds information back to the computer 30, maintaining the constant temperature for a specified period of time. When the specified time is reached, the air chiller 25 is turned off, the air heater 26 is turned on, and hot air is blown into the environmental chamber 1 through the air inlet duct 23. When the temperature rises to a specified value, the temperature sensor 29 feeds information back to the computer 30, maintaining the constant temperature for a specified period of time. When the specified time is reached, the air heater 26 is turned off, the air chiller 25 is turned back on, and the above process is repeated for the specified number of cycles. If the air pressure in the environmental chamber 1 is excessive, the temperature sensor 29 feeds information back to the computer 30, which then opens the air control valve 20, allowing the air in the environmental chamber 1 to be discharged through the exhaust duct 22.

[0089] During the freeze-thaw cycle, the stress state of the basic model is analyzed through the data monitored by the strain gauge.

[0090] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0091] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A concrete compression test device capable of simulating freeze-thaw cycles, comprising a test chamber, a loading system, a water supply and drainage system, a temperature control system, and a data control system, characterized in that: The test box is composed of an environmental box (1), an environmental box base (2), a support platform (3), a test piece box (4), a column (5) and a beam (6); The loading system is composed of a jack (7), a hydraulic piston (8), a pressure collector (9), a hydraulic pipe (10) and a loading plate (11); The water supply and drainage system is composed of a water tank (12), a drainage pipe (13), a drainage pipe valve (15), a drainage pump (16), a water inlet pipe (14), a water inlet pipe valve (17), a water inlet pump (18), a water tank motor (19) and a water level sensor (20); The temperature control system is composed of a temperature control box (21), an exhaust pipe (22), an air inlet pipe (23), an air control valve (24), an air refrigerator (25), an air heater (26), an axial flow fan (27), a temperature control box motor (28) and a temperature sensor (29); The data control system is composed of a computer (30) and a wire (31).

2. A concrete compression test device capable of simulating freeze-thaw cycles according to claim 1, characterized in that: The test box, water supply and drainage system, temperature control system and data control system are respectively connected to the bottom plate (32) through high-strength bolts.

3. A concrete compression test device capable of simulating freeze-thaw cycles according to claim 1, characterized in that: The test piece box (4) is located inside the environmental box (1) and is connected to the support (3) via high-strength bolts; the environmental box (1) and the support (3) are placed on the environmental box base (2) and are connected via high-strength bolts; The test box (4) is provided with doors in four horizontal directions. The door leaves are composed of horizontal and vertical steel strips, which produce uniform holes and allow the concrete to directly contact the water provided by the water pipe during the freeze-thaw cycle test to obtain the freeze-thaw effect. The spacing between the steel strips should not be too large to prevent the debris generated by the crushing of the test piece during the dry operation from splashing and causing danger. The environmental chamber (1) is equipped with a sealed door. When the sealed door is closed, water in the chamber is prohibited from leaking outwards, and the chamber meets the basic requirements of anti-seepage. The sealed door is made of transparent material, and the destruction process of the test piece can be observed during the test.

4. A concrete compression test device capable of simulating freeze-thaw cycles according to claim 1, characterized in that: The jack (7) in the loading system is connected in sequence with the crossbeam (6), the column (5), and the environmental chamber (1) via high-strength bolts; The environmental box (1) has a hole at the top, the hole diameter is larger than the diameter of the hydraulic pipe (10), the hole center is aligned with the bottom center of the hydraulic pipe (10), and the hydraulic pipe (10) passes through the hole at the top of the environmental box (1) and is connected to the loading plate (11); Hydraulic oil is stored in the hydraulic pipe (10), and the hydraulic piston (8) is placed in the hydraulic pipe (10) and connected to the jack (7); the sensing connector of the pressure sensor (9) is placed in the hydraulic pipe (10), and the data measured by the pressure sensor (9) is fed back to the computer (30) through the wire (31), and the pressure is adjusted by the computer (30).

5. A concrete compression test device capable of simulating freeze-thaw cycles according to claim 1, characterized in that: A water inlet hole is reserved at the top of the water tank (12) in the water supply and drainage system for injecting water into the water tank (12). The water tank (12) is connected to the environmental chamber (1) via a drainage pipe (13) and a water inlet pipe (14); The drainage pipe (13) is equipped with a drainage pipe valve (15) and a drainage pump (16) to control the discharge of water in the environmental box; the water inlet pipe (14) is equipped with a water inlet pipe valve (17) and a water inlet pump (18) to control the supply of water in the environmental box; The water level sensor (20) is installed on the top of the environmental box (1), and the measured water level data is fed back to the computer (30) through the wire (31); The drain pipe valve (15), drain pump (16), water inlet pipe valve (17), and water inlet pump (18) are connected to the water tank motor (19).

6. A concrete compression test device capable of simulating freeze-thaw cycles according to claim 1, characterized in that: The temperature control box (21) in the temperature control system is connected to the environmental box (1) via an exhaust pipe (22) and an air inlet pipe (23); The air inlet pipe (23) is formed by two pipes connected in parallel, and the two pipes are respectively connected in series with the air cooler (25) and the air heater (26); The air inlet pipe (23) is connected to the axial flow fan (27), and the axial flow fan (27) is connected to the temperature control box motor (28); by starting the temperature control box motor (28), the axial flow fan (27) supplies air to the environmental box (1) through the air inlet pipe (23); The exhaust pipe (22) is provided with an air control valve (24). When the air control valve (24) is closed, no gas is allowed to flow in the exhaust pipe (22). The air control valve (24), air refrigeration machine (25), and air heater (26) are respectively connected to the temperature control box motor (28), and the equipment operation is realized through the temperature control box motor (28). The temperature control box motor (28) is connected to the computer (30) through a wire (31); The temperature sensor (29) is installed on the top of the environmental box (1) and is connected to the wind control valve (24), the air cooler (25), and the air heater (26) through the wire (31). The measured temperature value is fed back to the computer (30) through the wire (31), and the temperature is adjusted by the computer (30).

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