Concrete gas permeability measuring device
By designing a concrete gas permeability measurement device consisting of a box, a stainless steel container, and a gas solenoid valve, the problem of inaccurate test results caused by improper operation of existing devices is solved, and convenient and accurate permeability measurement is achieved to evaluate concrete quality.
Patent Information
- Application Number
- CN202422584183.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The existing concrete gas permeability measurement device is improperly operated in actual testing, which affects the accuracy and effectiveness of the test results.
A concrete gas permeability measurement device was designed, which consists of a box, a stainless steel operating table, a stainless steel container, a gas solenoid valve, and an electronic flowmeter. The gas flow rate is measured by applying a gas pressure gradient, and the permeability is calculated using Darcy's law to ensure convenient operation and accurate test results.
The accuracy and effectiveness of concrete gas permeability measurements have been improved, making it possible to conveniently evaluate the density and impermeability of concrete, providing a reference for structural design.
Smart Images
Figure CN223377151U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of concrete gas permeability measurement, in particular to a concrete gas permeability measurement device. Background Art
[0002] At present, the size of gas permeability indicates the ability of porous media to allow fluid to pass through, and its unit is square micrometer (Darcy) or milli-micrometer (milli-Darcy). The gas permeability test is to allow clean, dry air to pass through a filter plate under an appropriate pressure difference, measure its pressure difference and flow rate, and calculate the permeability of the sample. Since absolute permeability is a physical parameter that is unrelated to the properties of the fluid and only related to the pore structure of the rock itself, the absolute permeability used in production is generally determined by air permeability testing. Gas permeability is the ability of gas to pass through concrete when gas seeps through concrete under a certain pressure gradient. Permeability directly determines the propagation speed of harmful substances in concrete and is one of the important indicators for measuring the durability of concrete. By measuring the gas permeability of concrete, the density and impermeability of concrete can be evaluated, providing a reference basis for the design of concrete structures.
[0003] Concrete gas permeability test equipment is currently rarely used in actual testing, and improper operation will affect the accuracy and effectiveness of the test results.
[0004] To this end, we developed a concrete gas permeability measurement device to solve the above problems. Utility Model Content
[0005] The utility model aims to overcome the deficiencies of the prior art and provide a concrete gas permeability measuring device, which has the advantages of being easy to operate, improving accuracy and effectiveness, and being easy to move.
[0006] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a concrete gas permeability measuring device, comprising a box body, a stainless steel operating table provided at the top of the box body, the top of the stainless steel operating table being sealedly connected to multiple stainless steel containers, and a main switch and a system control switch provided at one end, a display screen provided at the top of the main switch, and a motor provided at the bottom, a main air intake pipe provided at the top position of one end of the box body, the main air intake pipe being connected to a gas solenoid valve, a concrete test chamber provided in the stainless steel container, a circular air bag provided in the concrete test chamber, the gas solenoid valve being respectively connected to the concrete test chamber and the circular air bag, and the concrete test chamber being sealedly connected to an electronic flow meter.
[0007] Preferably, the gas solenoid valve is connected to a gas pressure stabilizer and communicates with the exhaust port of the motor.
[0008] Preferably, a specimen chamber air inlet is provided at the center of the bottom end of the concrete test chamber, and the specimen chamber air inlet is connected to the gas solenoid valve through a specimen chamber air inlet pipe.
[0009] Preferably, an airbag air inlet nozzle is provided at the center position of the bottom end of the circular airbag, and the airbag air inlet nozzle is connected to the gas solenoid valve through an airbag air circuit tube.
[0010] Preferably, the top of the stainless steel container is sealed with a stainless steel sealing cover, a specimen chamber exhaust port is provided at the center of the top of the stainless steel sealing cover, and the specimen chamber exhaust port is communicated with the electronic flow meter.
[0011] Preferably, the display screen is electrically connected to a pressure controller and a flow dynamics display unit, and the pressure controller is arranged on the upper side of the flow dynamics display unit.
[0012] Preferably, a connecting block is provided at the top end of the stainless steel sealing cover, and the connecting block is crimped to the stainless steel container by a long coil-type tool.
[0013] Preferably, a connecting ear is provided on the outer wall of the stainless steel container, and the long coil-type tool buckle is movably connected to the connecting ear.
[0014] Preferably, a box switch is provided on one side of the box in the length direction, and the box switch is a snap-on structure.
[0015] Preferably, a roller is provided at each of the four corners of the bottom end of the box.
[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:
[0017] The concrete gas permeability measuring device of the utility model can be used for testing by turning on a switch, and the sealing cover is sealed by crimping, which improves the convenience of operation. Various operating steps are performed during the test process, which improves the accuracy and effectiveness of the test results. Through the concrete gas permeability test, indicators such as the permeability coefficient and porosity of concrete can be obtained to evaluate the quality of the concrete material. The roller facilitates the mobile operation of the measuring device. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a schematic diagram of the external structure of the concrete gas permeability measuring device of the present invention.
[0019] Figure 2 This is a schematic diagram of the internal structure of the concrete gas permeability measuring device of the present invention. DETAILED DESCRIPTION
[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] Figure 1 and Figure 2 A concrete gas permeability measuring device is provided, comprising a box body 6, a stainless steel operating table 20 is provided at the top of the box body 6, the top of the stainless steel operating table 20 is sealedly connected to multiple stainless steel containers 1, and a main switch 4 and a system control switch 21 are provided at one end, preferably three stainless steel containers 1, a display screen 5 is provided at the top of the main switch 4, and a motor 22 is provided at the bottom, the motor 22 pumps air from the main air intake pipe 23 into the concrete test chamber 9 and the circular air bag 11, a main air intake pipe 23 is provided at the top position of one end of the box body 6, the main air intake pipe 23 is connected to a gas solenoid valve 12, the stainless steel container 1 is provided with a concrete test chamber 9, the concrete test chamber 9 is provided with a circular air bag 11, the gas solenoid valve 12 is respectively connected to the concrete test chamber 9 and the circular air bag 11, and the concrete test chamber 9 is sealed and connected to the electronic flow meter 8.
[0022] The gas solenoid valve 12 is connected to a gas pressure regulator 19 and communicates with the exhaust port of the motor 22. A snap-on switch 61 is located along one side of the longitudinal direction of the housing 6. Rollers 24 are located at each of the four corners of the bottom of the housing 6 to facilitate movement. The gas pressure regulator 19 stabilizes the air pressure in the specimen chamber inlet pipe 13 and the airbag air line 15.
[0023] A specimen chamber air inlet 14 is provided at the bottom center of the concrete test chamber 9. This inlet 14 is connected to the gas solenoid valve 12 via a specimen chamber air inlet pipe 13. An airbag air inlet nozzle 16 is provided at the bottom center of the circular airbag 11. This inlet nozzle 16 is connected to the gas solenoid valve 12 via an airbag air line pipe 15.
[0024] The top of the stainless steel container 1 is sealed with a stainless steel sealing cap 2. A specimen chamber exhaust vent 18 is located at the center of the top of the stainless steel sealing cap 2. This vent 18 is connected to an electronic flowmeter 8 via a specimen chamber outlet pipe 10. The electronic flowmeter 8 detects the flow rate in the specimen chamber outlet pipe 10. A connecting lug 101 is provided on the outer wall of the stainless steel container 1. A long coil-shaped tool buckle 3 is movably connected to the connecting lug 101. A connecting block 201 is located at the top of the stainless steel sealing cap 2. The connecting block 201 is crimped to the stainless steel container 1 via a long coil-shaped tool buckle 3.
[0025] The display screen 5 is electrically connected to the pressure controller 7 and the flow dynamic display unit 17. The pressure controller 7 is arranged on the upper side of the flow dynamic display unit 17. The flow dynamic display unit displays the gas flow rate and flow velocity. The pressure controller 7 is a PID pressure controller.
[0026] The principle of concrete gas permeability testing is to apply a gas pressure gradient to both sides of a concrete specimen, measure the gas flow rate when the gas reaches a steady state in the concrete, calculate the apparent gas permeability of the concrete using Darcy's law, further measure the steady flow rate under different pressure gradients, and obtain the inherent gas permeability of the concrete through regression analysis. Through continuous experimental research on concrete gas permeability testing methods, a concrete gas permeability measuring device has been developed to measure the ability of gas to pass through concrete under a certain pressure gradient.
[0027] A device for measuring concrete gas permeability is described. The device primarily comprises an air pipe, a gas solenoid valve, a gas regulator, a concrete specimen chamber, an electronic flowmeter, a PID pressure controller, a display unit, a stainless steel container (i.e., a sealed container with a sealing ring inside), a stainless steel sealing cover, and a circular airbag. To test concrete gas permeability, the sealed concrete specimen is placed in the center of the airbag in the concrete specimen chamber. The stainless steel sealing cover is then secured to seal the gas permeability unit. The gas solenoid valve is then opened, and the air pressure in the circular airbag is adjusted to a constant pressure of (0.7±0.01) MPa. The gas solenoid valve in the circular airbag is then closed to seal the pressure. The concrete specimen chamber's inlet gas solenoid valve is opened to ensure airtightness. The PID pressure controller is then adjusted to a constant pressure of (0.15±0.01) MPa. Measurements are then taken after maintaining this pressure for 30 minutes. The electronic flowmeter measures the gas flow at the concrete specimen chamber's outlet every 5 minutes. The PID pressure controller was adjusted to adjust the pressure of the air inlet of the concrete specimen bin, and the gas flow rate at the air outlet of the concrete specimen bin was measured when the air inlet pressure was 0.20 MPa, 0.30 MPa, and 0.40 MPa.
[0028] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.
Claims
1. A concrete gas permeability measuring device, characterized by: The invention comprises a box body (6), a stainless steel operating table (20) is provided at the top of the box body (6), the top of the stainless steel operating table (20) is sealed and connected to a plurality of stainless steel containers (1), and a main switch (4) and a system control switch (21) are provided at one end, a display screen (5) is provided at the top of the main switch (4), and a motor (22) is provided at the bottom end, a main air intake pipe (23) is provided at the top position of one end of the box body (6), the main air intake pipe (23) is connected to a gas solenoid valve (12), the stainless steel container (1) is provided with a concrete test chamber (9), the concrete test chamber (9) is provided with a circular air bag (11), the gas solenoid valve (12) is respectively connected to the concrete test chamber (9) and the circular air bag (11), and the concrete test chamber (9) is sealed and connected to an electronic flow meter (8).
2. The concrete gas permeability measuring device according to claim 1, characterized in that: The gas solenoid valve (12) is connected to a gas pressure stabilizer (19) and communicates with an exhaust port of the motor (22).
3. The concrete gas permeability measuring device according to claim 2, characterized in that: A specimen chamber air inlet (14) is provided at the center of the bottom end of the concrete test chamber (9), and the specimen chamber air inlet (14) is communicated with the gas solenoid valve (12) via a specimen chamber air inlet pipe (13).
4. The concrete gas permeability measuring device according to claim 2, characterized in that: An airbag air inlet nozzle (16) is provided at the center of the bottom end of the circular airbag (11), and the airbag air inlet nozzle (16) is connected to the gas solenoid valve (12) through an airbag air circuit tube (15).
5. The concrete gas permeability measuring device according to claim 2, characterized in that: The top end of the stainless steel container (1) is sealed to a stainless steel sealing cover (2), a test piece chamber exhaust port (18) is provided at the center of the top end of the stainless steel sealing cover (2), and the test piece chamber exhaust port (18) is in communication with the electronic flow meter (8).
6. The concrete gas permeability measuring device according to claim 1, characterized in that: The display screen (5) is electrically connected to a pressure controller (7) and a flow dynamics display unit (17), and the pressure controller (7) is arranged on the upper side of the flow dynamics display unit (17).
7. The concrete gas permeability measuring device according to claim 5, characterized in that: A connecting block (201) is provided at the top end of the stainless steel sealing cover (2), and the connecting block (201) is crimped to the stainless steel container (1) via a long coil-type tool buckle (3).
8. The concrete gas permeability measuring device according to claim 7, characterized in that: A connecting ear (101) is provided on the outer wall of the stainless steel container (1), and the long coil-type tool buckle (3) is movably connected to the connecting ear (101).
9. The concrete gas permeability measuring device according to claim 1, characterized in that: A box switch (61) is provided on one side of the box (6) in the longitudinal direction, and the box switch (61) is a snap-on structure.
10. The concrete gas permeability measuring device according to claim 1, characterized in that: A roller (24) is provided at each of the four corners of the bottom end of the box body (6).