CN211927633U - Automatic testing device for air permeability of ultrahigh-performance concrete - Google Patents
Automatic testing device for air permeability of ultrahigh-performance concrete Download PDFInfo
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- CN211927633U CN211927633U CN202020007877.4U CN202020007877U CN211927633U CN 211927633 U CN211927633 U CN 211927633U CN 202020007877 U CN202020007877 U CN 202020007877U CN 211927633 U CN211927633 U CN 211927633U
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Abstract
The utility model discloses an automatic testing device for ultra-high performance concrete gas permeability, which comprises a high pressure gas source, and an air inlet pipeline and an inflation pipeline which are led out by the high pressure gas source, wherein the air inlet pipeline is connected with an air inlet of a gas permeation unit for testing the concrete gas permeability, and the inflation pipeline is connected with an inflation airbag of the gas permeation unit; an automatic pressure regulating and stabilizing device is arranged on the air inlet pipeline; the gas outlet of the gas permeation unit is connected with a gas outlet pipeline, and a gas flowmeter is arranged on the gas outlet pipeline; the automatic pressure regulating and stabilizing device is connected with the gas flowmeter through a gas flow sensor.
Description
Technical Field
The utility model relates to an automatic testing arrangement for ultra high performance concrete gas permeability performance.
Background
The ultra-high performance concrete (UHPC) is a novel ultra-high performance cement-based composite material, which takes cement, silica fume, fine aggregate, steel fiber and high performance plasticizer as main raw materials, eliminates coarse aggregate, adopts low water-to-cement ratio, and is constructed according to the closest packing principle, and reduces the internal defects of the material to the maximum extent, so that the UHPC obtains ultra-high strength, ultra-high toughness and ultra-long durability, and has excellent impact resistance, wear resistance and caking property. The ultra-high performance concrete has ultra-high compactness, and the raw materials contain steel fibers, so that compared with water or chloride ion permeation media, the gas is used as the permeation media to test the permeation resistance of the ultra-high performance concrete, and the durability of the ultra-high performance concrete can be well represented. The existing gas permeation testing device adopting a differential pressure stabilization method has the problems of low testing precision and low testing efficiency when testing the gas permeation performance of the ultra-high performance concrete.
The low test precision is shown in two aspects:
1) the precision range of the existing soap film flowmeter can only reach 0.1 mL/min-100 mL/min, and for the ultra-high performance concrete, the gas flow which can be tested is in the range of 0.01 mL/min-0.1 mL/min due to the compact matrix, and the precision of the soap film flowmeter is not enough.
2) The upper limit of pressure controlled by the existing pressure regulating and stabilizing device is poor in pressure fluctuation effect, the upper limit of pressure of the air inlet nozzle is low, and the fluctuation is large.
The low test efficiency is shown in the following three aspects:
1) the existing pressure regulating and stabilizing device needs manual regulation, the pressure regulating and stabilizing device is poor in control pressure fluctuation effect, the pressure of the air inlet nozzle needs to be regulated to a target pressure for a long time, and the pressure of the air inlet nozzle needs to be manually regulated again after each pressure is measured.
2) When the soap film flowmeter is used for testing, after the soap film is required to be manually extruded, the gas flow is calculated through the time of the soap film after the soap film runs through a target scale area of the glass tube, when the gas flow is less than 0.1mL/min, the time of the soap film after running through one tube is up to 10min, the soap film is in an unstable state, after the testing time is prolonged, the tube wall of the flowmeter becomes dry, the soap film is easy to break in the moving process, and therefore the phenomenon that effective data can be obtained only after the soap film is measured for 5-10 times is generated, and the efficiency is greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that an automatic testing arrangement for ultra high performance concrete gas permeability that can improve ultra high performance concrete gas permeability test accuracy and efficiency of software testing is provided.
The technical problem to be solved can be implemented by the following technical scheme.
An automatic testing device for the air permeability of ultra-high performance concrete is characterized by comprising a high-pressure air source, an air inlet pipeline and an inflation pipeline, wherein the air inlet pipeline and the inflation pipeline are led out from the high-pressure air source; an automatic pressure regulating and stabilizing device is arranged on the air inlet pipeline; the gas outlet of the gas permeation unit is connected with a gas outlet pipeline, and a gas flowmeter is arranged on the gas outlet pipeline; the automatic pressure regulating and stabilizing device is connected with the gas flowmeter through a gas flow sensor.
As a further improvement of the technical scheme, the gas permeation unit comprises a cylindrical sleeve body, the upper part of the cylindrical sleeve body is a top cover, the lower part of the cylindrical sleeve body is a base, a concrete test block for testing is placed in the cylindrical sleeve body, a silica gel sleeve and the inflatable air bag are sequentially arranged between the concrete test block and the inner wall of the cylindrical sleeve body from inside to outside, and a closed inner cavity is formed among the inflatable air bag, the top cover and the base; the upper end of the top cover is provided with the air inlet, and the lower part of the base is provided with the air inlet; and an air path channel for connecting the inflation pipeline and the inflation air bag is formed on the inner wall of the cylindrical sleeve body.
As a further improvement of the technical scheme, a funnel-shaped inner cavity with a lower middle part and a higher periphery is formed on the upper end surface of the base, and an opening of the funnel-shaped inner cavity is smaller than the outer diameter of the concrete test block; the funnel-shaped inner cavity is connected with the air inlet.
As the preferred embodiment of the utility model, the inflatable air bag is an inflatable rubber oil bag.
As a further improvement of the present invention, the gas flow sensor is electrically connected to the gas flowmeter.
As a further improvement of the technical scheme, a pressure reducing valve is arranged on the air inlet pipeline; and a pressure reducing valve is arranged on the inflation pipeline.
Also as a preferred embodiment of the present invention, the gas flow meter is a high-precision gas flow meter; the measuring range of the high-precision gas flowmeter is 0.01-1 mL/min, and the measuring precision is 0.001 mL/min.
Preferably, the high-pressure gas source is a high-pressure nitrogen source.
As a further improvement of the utility model, part or all of the top cover is a transparent window.
Further, a PVC base plate is arranged between the top cover and the concrete test block.
By adopting the technical scheme, the testing device can more accurately and automatically test the gas permeability of the ultra-high performance concrete, and solves the problems that the existing testing device detects the gas permeability testing precision and the testing efficiency of the ultra-high performance concrete.
Drawings
Fig. 1 is the structure schematic diagram of the automatic testing device for gas permeability of ultra-high performance concrete.
In the figure: 1-high pressure gas bottle 2-gas circuit switch 3-pressure reducing valve 4-automatic pressure regulating and stabilizing device 5-gas circuit pipe 6-gas circuit joint 7-gas bag 8-top cover gas circuit joint 9-high precision gas flowmeter 10-round steel sleeve 11-inner hexagon screw 12-base 13-concrete test block 14-top cover 15-inner hexagon screw 16-gas flow sensor 17-external control system 18-base gas circuit joint 19-base upper cavity 20-PVC round backing plate 21-silica gel sleeve 22-gas permeation unit
Detailed Description
The following describes in further detail embodiments of the present invention with reference to the accompanying drawings.
The utility model provides an automatic testing arrangement for ultra high performance concrete gas permeability, mainly include high-pressure gas cylinder 1 as the air supply (preferred high-pressure nitrogen gas source), be two air supply lines through a plurality of relief pressure valves 3 and 2 branches of gas circuit switch, one is the air inlet pipe way of connecting base gas circuit joint 18, one is the gas circuit (gas circuit pipe 5) of connecting the gas circuit joint 6 of steel bushing. An automatic pressure regulating and stabilizing device 4 is arranged on the air inlet pipeline.
The gas permeation unit 22 mainly comprises a cylindrical shell made of round steel sleeves 10 on the periphery, a top cover 14 is arranged on the upper portion of the cylindrical shell, a base 12 is arranged on the lower portion of the cylindrical shell, and the top cover 14 and the round steel sleeves 10 and the base and the round steel sleeves 10 are fixed through hexagon socket head cap screws 15 and 11 respectively. A chamber surrounded by the top cover, the base and the round steel sleeve 10 is provided with a concrete test block 13 with ultrahigh performance, and a PVC circular cushion plate 20 is arranged between the concrete test block 13 and the top cover 14; the silica gel cover 21 and the air bag 7 are sequentially arranged between the concrete test block 13 and the round steel cover 10, the air channel is arranged in the middle of the round steel cover 10, an air inlet nozzle connected with an external inflation air source (namely an inflation pipeline) through an air channel connector 6 is arranged on the outer side of the air channel, the inner side of the air channel is connected with the inflation rubber bag, and the inflation rubber bag is used for elastically sealing the side edge of the round cake-shaped ultrahigh-performance concrete test block through the extrusion silica gel cover after inflation, so that an airtight inner cavity is formed among the air bag, the top cover and the base. After being introduced through the gas circuit joint 18, the gas passes through the concrete test block 13 and then goes from the top cover gas circuit joint 8 to the high-precision gas flowmeter 9. A funnel-shaped cavity (i.e., the upper cavity 19 of the base in the figure) is formed between the base 12 and the concrete block 13.
The automatic pressure regulating and stabilizing device 4 is connected with the high-precision gas flowmeter 9 through a gas flow sensor 16. Meanwhile, the gas flow sensor 16 may also be connected to an external control system 17.
The device be suitable for the gas permeability coefficient of survey ultra high performance concrete, can carry out following operation during specifically using:
1) according to the figure 1, a gas circuit of a penetration device is connected, a high-pressure gas bottle 1 reduces the gas pressure to 1.0MPa through a gas circuit switch 2 and a pressure reducing valve 3 respectively and then leads the gas to a gas penetration unit 22 in two paths, wherein one path is connected with a gas inlet nozzle (namely a gas circuit joint 6) of a round steel sleeve to inflate an inflatable airbag 7 (an inflatable rubber bag); the other path is connected with the automatic pressure regulating and stabilizing device 4 and then is connected to a base air inlet nozzle (namely an air path joint 18) of the air permeation unit 22 through an air path pipe. A top cover gas outlet nozzle (namely a top cover gas path joint 8) of the gas permeation unit 22 is connected with a high-precision gas flowmeter 9, the high-precision gas flowmeter 9 transmits gas flow information to a gas flow sensor 16, the gas flow sensor 16 is divided into two paths, one path is connected with an automatic pressure regulating and stabilizing device 4, and gas flow parameters are transmitted for automatic pressure regulation and stabilization; the other is connected to an external control system 17, for example for additional gas permeability coefficient calculation services, and thus for automated calculation of the ultra high performance concrete gas permeability coefficient.
2) And assembling the gas permeation unit, wherein an inflatable rubber bag (namely an air bag 7) is embedded into a clamping groove of a circular steel sleeve 10 at the middle section of the permeation unit and then is fixedly connected with a base 12 of the permeation unit through an inner hexagonal screw 11 of the base. The PVC round cushion plate 20 is placed above the ultra-high performance concrete test block 13, the side edge of the PVC round cushion plate is wrapped by the silica gel sleeve 21 to form a whole, then the PVC round cushion plate is placed in a cavity formed by the base and the round steel sleeve, the top cover 14 of the infiltration unit is covered, and the PVC round cushion plate is fixed with the middle round steel sleeve 10 through the hexagon socket head cap screw 15 of the top cover.
3) And (3) starting a switch of the automatic pressure regulating and stabilizing device, regulating the pressure of the air inlet nozzle to 0.2MPa, after 5min of pressure stabilization, judging according to the air flow of the air outlet nozzle by an air flow sensor 16 connected with the high-precision gas flowmeter 9 as shown in figure 1, when the air flow is less than 0.050mL/min, automatically increasing the pressure of the automatic pressure regulating and stabilizing device 4 by 0.1MPa, after 5min of pressure stabilization, and if the air flow is still less than 0.050mL/min, increasing the pressure of 0.1MPa again until the flow of the air outlet nozzle is increased to be more than 0.050 mL/min.
4) When the flow of the air tap is increased to be more than 0.050mL/min, the pressure regulating and stabilizing device automatically judges the pressure as testable pressure, the pressure is automatically kept constant for 1h under the pressure, and the high-precision gas flowmeter records the average gas flow in the period.
5) And then the voltage regulating and stabilizing device automatically increases 0.1MPa, and the operation of 4) is repeated. Until the gas flow of the gas outlet nozzle under the pressure of 4 gas inlet nozzles is obtained.
6) The high-precision gas flowmeter transmits the acquired gas outlet flow under 4 pressures and corresponding pressures to the gas flow sensor 16, then transmits the gas outlet flow to the external control system 17 connected with the gas flow sensor 16 to obtain a gas permeability coefficient, and the gas permeability coefficient of the ultra-high performance concrete can be obtained by automatic fitting after the thickness of the test piece and the ambient temperature are input.
The optimal range of the high-precision gas flowmeter is 0.01-1 mL/min, the measurement precision is 0.001mL/min, and the high-precision gas flowmeter preferably has a real-time gas flow recording function.
The automatic pressure regulating and stabilizing device adopting the technical scheme is connected with the high-precision gas flowmeter through the gas flow sensor, and automatically regulates and stabilizes pressure according to the gas flow condition. The problem that the existing testing device for detecting the gas permeability of the ultra-high performance concrete is low in testing precision and testing efficiency can be solved. And further, the automatic fitting calculation of the gas permeability coefficient is carried out by using the data transmitted by the gas flow sensor obtained by the device.
The following are more specific examples.
Example 1:
1) the gas infiltration unit shown in fig. 1 is assembled by firstly embedding a rubber oil bag (i.e. an air bag 7) into a clamping groove of a middle section steel sleeve (i.e. a round steel sleeve 10) of the infiltration unit, then connecting and fixing the rubber oil bag with a base 12 of the infiltration unit through an inner hexagon screw 11 of the base, putting a concrete test block 13 with a silica gel sleeve 21 wrapped on the side surface above the base and wrapping the concrete test block with the rubber oil bag, then covering a top cover 14 of the infiltration unit and fixing the concrete test block with the middle section steel sleeve of the infiltration unit through an inner hexagon screw 15 of the top cover.
2) The automatic pressure regulating device regulates pressure according to a gas flow signal transmitted by a gas flowmeter sensor, the pressure of an air inlet nozzle is initially regulated to 0.2MPa, after the pressure is stabilized for 5min, an air flow sensor in the high-precision gas flowmeter judges according to the air flow of an air outlet nozzle, when the air flow is less than 0.050mL/min, the pressure regulating device automatically increases 0.1MPa, after the pressure is stabilized for 5min, the judgment is made again, if the air flow is still less than 0.050mL/min, the pressure is increased by 0.1MPa again until the air flow of the air outlet nozzle is increased to be more than 0.050 mL/min.
Such as: for a certain ultra-high performance concrete test block with the compressive strength of 143MPa, when the pressure of the initial air inlet nozzle of the automatic pressure regulating and stabilizing device is increased to 0.2MPa, the air flow is not detected by the air outlet nozzle or is lower than the detection limit. And then the pressure of the air inlet nozzle is respectively increased to 0.3MPa by the automatic pressure regulating and stabilizing device, and the gas flow is not detected. And further increasing the pressure of the air inlet nozzle to 0.4MPa, detecting that the gas flow is 0.051mL/min, determining that the pressure test result of the air inlet nozzle is effective, stabilizing the pressure for 1h, and measuring the average gas flow to be 0.052 mL/min. Then the flow rates of the air outlet nozzles measured at 0.5MPa, 0.6MPa and 0.7MPa are respectively 0.079mL/min, 0.105mL/min and 0.133 mL/min.
3) The pressure stabilizing device is a double-valve pressure difference controller, and after the automatic pressure regulating device judges that the air flow meets the test requirements, the pressure stabilizing device responds within 0.1s, so that the pressure entering the air inlet nozzle is stable.
4) The gas flow sensor has high sensing sensitivity, can measure the gas flow with the precision as low as 0.001mL/min, and converts the gas mass flow into an analog voltage or a digital signal for output.
5) The gas flow sensor is characterized in that a USB interface is arranged on the outer surface of the gas flow sensor, the USB interface can be electrically connected with a circuit board data storage and transmission module, and the related data obtained by the device is further utilized for calculating the final gas permeability coefficient.
6) The gas permeability coefficient can be calculated based on the gas flow at four pressures,the apparent gas permeability coefficient k at each pressure is calculated according to the following formulaa：
Auto-fitting software for 1/Pm at different pressures and corresponding apparent permeability kaLinear regression was performed according to the formula to obtain the gas permeability kv：
Wherein:
ka: apparent gas permeability (m) of concrete2)；
Patm: atmospheric pressure (Pa) under test conditions;
p: absolute pressure (Pa) of a gas inlet nozzle of the infiltration unit, 150000-400000 (Pa);
Pm: the average pressure (Pa) of the inlet and outlet nozzles of the osmosis unit is equal to (P + P)atm)/2；
Q: the stable gas flow (m3/s) of the gas outlet nozzle of the permeation unit;
l: the thickness (m) of the specimen;
μ: kinetic viscosity coefficient of gas (Pa · s);
a: cross sectional area (m) of concrete specimen2)m2。
Kv: gas permeability (m)2)；
For the ultra-high performance concrete test block, the gas permeability coefficient obtained by automatic calculation is 2.8 multiplied by 10-20m2。
Example 2:
the top cap 14 middle part of gas permeation unit has set up perspective organic glass board as the transparent window to in observing inside gaseous change, set up the sealing washer (like the PVC circle backing plate in the picture) between perspective organic glass board and permeation unit top cap 14, and set up the gas outlet nozzle at the top cap side, can conveniently observe the condition that ultra-high performance concrete surface gas oozes, also can inspect the sealed condition of ultra-high performance concrete test block side simultaneously.
The utility model provides an automatic testing arrangement for ultra high performance concrete gas permeability can be more accurate and automatic test ultra high performance concrete gas permeability, solves the problem that current testing arrangement detects ultra high performance concrete gas permeability test accuracy and efficiency of software testing hang down. It should be noted in particular that the description refers to calculations and controls only for illustrating the field of application of the device and for the sake of comprehension, the object of the invention being limited to the specific construction made of hardware devices.
Claims (10)
1. An automatic testing device for gas permeability of ultra-high performance concrete is characterized by comprising a high-pressure gas source, and an air inlet pipeline and an inflation pipeline which are led out by the high-pressure gas source, wherein the air inlet pipeline is connected with an air inlet of a gas permeation unit for testing the gas permeability of the concrete, and the inflation pipeline is connected with an inflation airbag of the gas permeation unit; an automatic pressure regulating and stabilizing device is arranged on the air inlet pipeline; the gas outlet of the gas permeation unit is connected with a gas outlet pipeline, and a gas flowmeter is arranged on the gas outlet pipeline; the automatic pressure regulating and stabilizing device is connected with the gas flowmeter through a gas flow sensor.
2. The automatic testing device for the air permeability of the ultra-high performance concrete according to claim 1, wherein the air permeability unit comprises a cylindrical sleeve body, the upper part of the cylindrical sleeve body is a top cover, the lower part of the cylindrical sleeve body is a base, a concrete test block for testing is placed in the cylindrical sleeve body, a silica gel sleeve and the inflatable air bag are sequentially arranged between the concrete test block and the inner wall of the cylindrical sleeve body from inside to outside, and a closed inner cavity is formed among the inflatable air bag, the top cover and the base; the upper end of the top cover is provided with the air inlet, and the lower part of the base is provided with the air inlet; and an air path channel for connecting the inflation pipeline and the inflation air bag is formed on the inner wall of the cylindrical sleeve body.
3. The automatic testing device for the air permeability of the ultra-high performance concrete according to claim 2, wherein the upper end surface of the base forms a funnel-shaped inner cavity with a lower middle part and a higher periphery, and the opening of the funnel-shaped inner cavity is smaller than the outer diameter of the concrete test block; the funnel-shaped inner cavity is connected with the air inlet.
4. The automatic testing device for ultra-high performance concrete air permeability according to claim 1, 2 or 3, wherein the inflatable air bag is an inflatable rubber oil bag.
5. The automatic testing device for ultra-high performance concrete air permeability of claim 1, wherein the gas flow sensor is electrically connected to the gas flow meter.
6. The automatic testing device for the air permeability of ultra-high performance concrete according to claim 1, wherein a pressure reducing valve is arranged on the air inlet pipeline; and a pressure reducing valve is arranged on the inflation pipeline.
7. The automatic testing device for ultra-high performance concrete air permeability according to claim 1, wherein the gas flow meter is a high precision gas flow meter; the measuring range of the high-precision gas flowmeter is 0.01-1 mL/min, and the measuring precision is 0.001 mL/min.
8. The automatic testing device for ultra-high performance concrete air permeability according to claim 1, wherein the high pressure gas source is a high pressure nitrogen gas source.
9. The automatic testing device for ultra-high performance concrete air permeability according to claim 2, wherein part or all of the top cover is a transparent window.
10. The automatic testing device for the air permeability of ultra-high performance concrete according to claim 2 or 9, wherein a PVC backing plate is arranged between the top cover and the concrete test block.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112730199A (en) * | 2021-02-01 | 2021-04-30 | 温州市市政工程建设开发公司 | Water permeability detection device and method for permeable asphalt concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112730199A (en) * | 2021-02-01 | 2021-04-30 | 温州市市政工程建设开发公司 | Water permeability detection device and method for permeable asphalt concrete |
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Inventor after: Fan Junjiang Inventor after: Yu Linfeng Inventor after: Han Jianjun Inventor after: Shen Guiyang Inventor after: Sun Dandan Inventor after: Li Hualiang Inventor before: Fan Junjiang Inventor before: Yu Linfeng Inventor before: Han Jianjun Inventor before: Shen Guiyang Inventor before: Sun Dan Inventor before: Li Hualiang |