CN219046063U - Concrete water vapor permeability coefficient detection and minimum permeation contact area measurement device - Google Patents
Concrete water vapor permeability coefficient detection and minimum permeation contact area measurement device Download PDFInfo
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- CN219046063U CN219046063U CN202222969088.0U CN202222969088U CN219046063U CN 219046063 U CN219046063 U CN 219046063U CN 202222969088 U CN202222969088 U CN 202222969088U CN 219046063 U CN219046063 U CN 219046063U
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Abstract
The utility model provides a concrete water vapor permeability coefficient detection and minimum permeability contact area measurement device, which comprises: the test block placing device comprises an upper machine body part, a test block placing part, a lower machine body, a rack and a computer, wherein the lower machine body is sleeved outside the upper machine body part, the test block placing part is positioned inside the lower machine body and the upper machine body part sleeved part, the lower machine body is placed on the rack, and the upper machine body part is electrically connected with the computer. The utility model provides a device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of concrete, which has the advantages of wide pressure difference value range, high automation degree, simple structure, convenient operation, small occupied space, convenient transportation and capability of meeting the field detection.
Description
Technical Field
The utility model relates to a device for measuring concrete performance, in particular to a device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of concrete.
Background
The water and gas permeability of concrete refers to the property that water or gas permeates or penetrates the concrete under the action of gradient pressure, is an important index of the durability of the concrete, is generally measured by a permeability coefficient, and mainly depends on the porosity of the concrete, the number of harmful pores (including the number of non-capillary pores and the number of large capillary pores) is mainly measured, and at present, two types of permeable media, namely water and gas, are mainly used when the property is measured, and the pore structure inside the concrete is not only related to the durability such as the permeability and the air tightness of the concrete, but also influences the toughness and the compression resistance of the concrete.
The corrosive substances can enter the interior through the concrete pore structure by taking water or gas as a transport medium, so that the durability of the concrete is influenced, and the internal steel bars are corroded. In some special environments, such as coasts, places rich in corrosive substances, such as SO2-4 and CO2-3, when the seepage resistance of concrete is poor, cl-, SO2-4 and CO2-3 can enter the interior of the concrete to seriously affect the service life and safety of the building, SO that the areas need to pay special attention to the seepage performance index of the concrete, and also such as some buildings in low-lying places, such as basements and the like, have higher requirements on the seepage resistance of the concrete.
The pore structure of concrete, i.e. porosity, pore size distribution, determines the transport properties of different media in concrete. The gas permeability coefficient of the concrete can reflect the concrete pore structure and whether cracks occur. When water is used as a permeation medium, the permeation process is difficult to reach a steady state due to continuous hydration of cement, migration of substances, change of capillary structures and the like, so that the gas permeation test can more react with the pore structure in the concrete compared with the water permeation test, and the gas permeation test is an important necessary supplement for the water permeation of the concrete. Characterizing the permeability of concrete in terms of its gas permeability coefficient has the following advantages: (1) The gas molecular dynamics diameter is small, and can more easily pass through capillary holes in concrete. (2) capillary siphon effect has little influence on gas molecules. (3) is not affected by the continuous hydration of the cement. (4) Compared with the water permeability coefficient, the gas molecules are not influenced by the chemical components of the pore liquid in the concrete, and the pore structure of the concrete is reflected more truly and accurately.
In the test process of concrete permeability test, when the contact area of gas, water and concrete is small, the situation of unstable permeability can appear, and most of the conditions are smaller than the actual permeability coefficient of the concrete, and the permeability tends to be stable along with the increase of the permeation contact area. The reason is that the surface and the inside of the concrete are provided with large seepage channels, the seepage movement of gas and water is mainly carried out through the large seepage channels, and when the seepage contact area of the gas, the water and the concrete is small, the probability of containing the large seepage channels is also small. The large seepage rate of the cross section of the concrete test block with small contact area is more different from the whole large seepage rate no matter the large seepage channel is included or not. Only when the permeation contact area reaches a certain size, the large permeation flow channel rate tends to be stable, and the measured permeation coefficient is representative at the moment, so that the calculation and the measurement of the minimum permeation contact area of the concrete are of great significance in practice, and therefore, the design of a device for detecting the water vapor permeation coefficient and measuring the minimum permeation contact area of the concrete is quite necessary.
Disclosure of Invention
The utility model aims to provide a device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of concrete, which has the advantages of wide pressure difference value range, high degree of automation, simple structure, convenient operation, small occupied space, convenient transportation and capability of meeting the field detection.
In order to achieve the above object, the present utility model provides the following solutions:
a concrete water vapor permeability coefficient detection and minimum permeability contact area measurement device comprises: the test block placing device comprises an upper machine body part, a test block placing part, a lower machine body, a rack and a computer, wherein the lower machine body part is sleeved outside the upper machine body part, the test block placing part is positioned inside the upper machine body part and the lower machine body, the lower machine body is placed on the rack, and the upper machine body part is electrically connected with the computer;
the upper machine body part comprises an air inlet water part, an upper machine body and a liquid level detection device, wherein the air inlet water part is arranged at the top of the upper machine body, an upper cavity is formed in the upper machine body, the liquid level detection device is arranged at the side part of the upper machine body and is communicated with the upper cavity, and the liquid level detection device is electrically connected with the computer;
the inside of the lower machine body is provided with a lower cavity, the bottom of the lower machine body is provided with a gas-water outlet, and the gas-water outlet is communicated with the lower cavity;
the test block placing part comprises a test block placing cavity, a test block fixing piece, a gasket adjusting part and a temperature control device, wherein the bottom of the upper cavity is provided with the test block fixing piece, the upper cavity is communicated with the gasket adjusting part, the bottom of the gasket adjusting part is provided with the test block placing cavity, the bottom of the test block placing cavity is provided with the lower cavity, the junction of the test block placing cavity and the lower cavity is provided with the test block fixing piece, the upper machine body is connected with the lower machine body through the test block fixing piece, the inside of the placing cavity is provided with the test block, and the outer side of the lower part of the upper machine body is provided with the temperature control device.
Optionally, the air inlet water part comprises an air inlet part and a water inlet part;
the water inlet part comprises a water tank, a water pressure pump and a water inlet pipe, wherein the water pressure pump is arranged on the water tank, the water pressure pump is connected with the water inlet pipe, the water inlet pipe is communicated with the upper cavity, the water sealing valve, the water pressure gauge protection valve and the water pressure Jiang Biansong device are arranged on the water inlet pipe, and the water pressure Jiang Biansong device is electrically connected with the computer;
the air inlet part comprises an air booster pump and an air inlet pipe, the air booster pump is connected with the air inlet pipe, the air inlet pipe is communicated with the upper cavity, the air inlet pipe is provided with a gas sealing valve, a gas pressure gauge protection valve and a gas pressure transmitter, and the gas pressure transmitter is electrically connected with the computer.
Optionally, the test block fixing piece includes a gasket adjusting baffle, a fixing plate, a nut and a screw, the gasket adjusting baffle is arranged at the junction of the gasket adjusting part and the upper cavity, the fixing plate is arranged at the junction of the test block placing cavity and the lower cavity, a plurality of screw holes are correspondingly arranged on the gasket adjusting baffle and the fixing plate, and the screw penetrates through the screw holes and is fixed through the nut;
the gasket adjusting part comprises a gasket and a gasket adjusting area, the gasket is placed in the gasket adjusting area, and the gasket is arranged between the lower part of the gasket adjusting baffle and the upper part of the test block;
the diameter of the test block is smaller than that of the test block placing cavity, paraffin and rosin mixture are roll-coated on the side face of the test block, the gasket adjusting baffle, the gasket and the fixing plate are hollow, and paraffin and rosin mixture are coated on the upper contact surface and the lower contact surface of the gasket.
Optionally, the liquid level detection device comprises a liquid level meter and a liquid level meter automatic reader, the liquid level meter is arranged on the outer side part of the upper cavity and is communicated with the interior of the upper cavity, the liquid level meter is provided with the liquid level meter automatic reader, and the liquid level meter automatic reader is in communication connection with a computer;
the temperature control device comprises a heat tracing band and a temperature control box, wherein the heat tracing band is wound outside the lower half part of the upper machine body, and the temperature control box is electrically connected with the heat tracing band.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects: according to the concrete water vapor permeability coefficient detection and minimum permeability contact area measurement device provided by the utility model, the contact area can be changed by changing the size of the gasket, and the test of the minimum permeability contact area is researched; closing a water inlet during the gas permeation test to realize that the water permeation test and the gas permeation test are not mutually interfered; the upper cavity can respectively store gas and water, the device can respectively realize the detection tests of three concrete performances of gas permeability, water permeability and minimum permeation contact area of concrete, and has high concentration and multifunction; the upper part of the test block is sealed with the machine body by adopting a paraffin and rosin extrusion sealing mode, so that the problem of difficult sealing in the equipment is solved; the concrete penetration test is carried out in a pressurizing mode, the test pressure range is wide, and the actual test requirement is met; the computer is used for recording and transmitting the pressure gauge and the liquid level data, so that the permeability of the concrete is expressed accurately, rapidly and intuitively in real time, and the permeability of each stage in the concrete permeation process can be observed; the method of injecting the paraffin and rosin mixture liquid is used for tightly fitting and sealing the test block and the side wall, thereby meeting the requirement of sealing the side wall and increasing the sealing performance of the upper part of the test block; the test equipment has small occupied space, light weight and few accessories, is convenient to carry, and can be used for on-site sampling and on-site test.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of concrete;
fig. 2 is a graph of permeability coefficient minimum contact area.
Reference numerals: 1. a gas seal valve; 2. a gas pressure gauge; 3. a gas pressure gauge protection valve; 4. a water pressure gauge protection valve; 5. a water pressure gauge; 6. a water seal valve; 7. a gas inlet; 8. a water inlet; 9. a water pressure transmitter; 10. an air booster pump; 11. a water tank; 12. a water pressure pump; 13. an upper body; 14. an upper cavity; 15. a liquid level gauge; 16. an automatic liquid level meter reader; 17. a gasket adjustment zone baffle; 18. a shim adjustment zone; 19. a gasket; 20. a test block placing cavity; 21. a test block; 22. a lower body; 23. a lower cavity; 24. a gas-water outlet; 25. a screw hole; 26. a nut; 27. a screw; 28. a computer; 29. a stand; 30. a heat tracing belt; 31. a temperature control box; 32. an upper fixing body; 33. a lower fixing member; 34. a fixing plate; 35. a gas pressure transmitter.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The utility model aims to provide a device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of concrete, which has the advantages of wide pressure difference value range, high degree of automation, simple structure, convenient operation, small occupied space, convenient transportation and capability of meeting the field detection.
In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, a device for detecting a water vapor permeability coefficient and measuring a minimum permeability contact area of concrete according to an embodiment of the present utility model includes: the test block testing device comprises an upper machine body part, a test block placing part, a lower machine body 22, a rack 29 and a computer 28, wherein the lower machine body 22 is sleeved outside the upper machine body part, the test block placing part is positioned inside the upper machine body part and the lower machine body 22, the lower machine body 22 is placed on the rack 29, and the upper machine body part is electrically connected with the computer 28;
the upper machine body part comprises an air inlet water part, an upper machine body 13 and a liquid level detection device, wherein the air inlet water part is arranged at the top of the upper machine body 13, an upper cavity 14 is arranged in the upper machine body 13, the liquid level detection device is arranged at the side part of the upper machine body 13 and is communicated with the upper cavity 14, and the liquid level detection device is electrically connected with the computer 28;
a lower cavity 23 is arranged in the lower machine body 22, a gas-water outlet 24 is arranged at the bottom of the lower machine body 22, and the gas-water outlet 24 is communicated with the lower cavity 23;
the test block placing part comprises a test block 21, a gasket adjusting part, a test block fixing part and a temperature control device, wherein the gasket adjusting part is arranged at the bottom of the upper machine body 13, the upper cavity 14 is communicated with the gasket adjusting part, the test block fixing part is arranged at the bottom of the gasket adjusting part, the lower machine body 22 is arranged at the bottom of the test block fixing part, the placing cavity is arranged inside the test block fixing part, the test block 21 is arranged inside the placing cavity, and the temperature control device is arranged at the upper half part of the outer part of the test block fixing part.
The test block placing part comprises a test block placing cavity 20, a test block fixing piece, a gasket adjusting part and a temperature control device, wherein the bottom of the upper cavity 14 is provided with the test block fixing piece, the upper cavity 14 is communicated with the gasket adjusting part, the bottom of the gasket adjusting part is provided with the test block placing cavity 20, the bottom of the test block placing cavity 20 is provided with a lower cavity 23, the junction of the test block placing cavity 20 and the lower cavity 23 is provided with the test block fixing piece, the upper machine body 13 is connected with the lower machine body 22 through the test block fixing piece, the inside of the test block placing cavity 20 is provided with a test block 21, and the outer side of the lower part of the upper machine body 13 is provided with the temperature control device.
The air inlet water part comprises an air inlet part and a water inlet part;
the water inlet part comprises a water tank 11, a water pressure pump 12 and a water inlet pipe, wherein the water pressure pump 12 is arranged on the water tank 11, the water pressure pump 12 is connected with the water inlet pipe, the water inlet pipe is communicated with the upper cavity 14, the water inlet pipe is provided with the water sealing valve 6, the water pressure gauge 5, the water pressure gauge protection valve 4 and the water pressure transmitter 9, and the water pressure transmitter 9 is electrically connected with the computer 28;
the air inlet part comprises an air booster pump 10 and a water inlet pipe, the air booster pump 10 is connected with the air inlet pipe, the air inlet pipe is communicated with the upper cavity 14, the air inlet pipe is provided with the gas sealing valve 1, the gas pressure gauge 2, the gas pressure gauge protection valve 3 and the gas pressure transmitter 35, and the gas pressure transmitter 35 is electrically connected with the computer 28. One embodiment of the utility model is: the water inlet pipe and the air inlet pipe are Y-shaped, and the diameters of the water inlet pipe and the air inlet pipe are different known diameters.
The test block fixing piece comprises a gasket adjusting baffle 17, a fixing plate 32, a nut 26 and a screw rod 27, wherein the gasket adjusting baffle 17 is arranged at the junction of the gasket adjusting part and the upper cavity 14, the fixing plate 32 is arranged at the junction of the test block placing cavity 20 and the lower cavity 23, a plurality of screw holes 25 are correspondingly arranged on the gasket adjusting baffle 17 and the fixing plate 32, and the screw rod 27 penetrates through the screw holes 25 and is fixed through the nut 26;
the gasket adjusting part comprises a gasket 19 and a gasket adjusting region 18, the gasket 19 is placed in the gasket adjusting region 18, and the gasket 19 is arranged between the lower part of the gasket adjusting baffle 17 and the upper part of the test block 21;
the diameter of the test block 21 is slightly smaller than that of the test block placing cavity 20, and the side surface of the test block 21 is roll-coated with paraffin and rosin mixture, so that the edge area of the test block 21 is sealed with the inner wall of the upper machine body 13 and is not contacted with gas or water; the inside of the gasket adjusting baffle 17, the gasket 19 and the fixing plate 32 is hollow, the upper and lower contact surfaces of the gasket 19 are coated with paraffin and rosin mixtures, the gaskets 19 with different mesopore diameters are used for adjusting the contact area between gas and water and the test block 21, the upper part of the gasket 19 is extruded by the baffle 17 of the mesopore gasket adjusting area, and the lower part is extruded by the test block 21, so that the upper and lower parts are tightly sealed.
The liquid level detection device comprises a liquid level meter 15 and a liquid level meter automatic reader 16, wherein the liquid level meter 15 is arranged on the outer side of the upper cavity 14 and is communicated with the interior of the upper cavity 14, the liquid level meter 15 is provided with the liquid level meter automatic reader 16, and the liquid level meter automatic reader 16 is electrically connected with a computer 28.
The temperature control device comprises a heat tracing band 30 and a temperature control box 31, wherein the heat tracing band 30 is wound outside the lower half part of the upper machine body 13, and the temperature control box 31 is electrically connected with the heat tracing band 30.
One embodiment of the utility model is:
the minimum contact area test method comprises the following steps:
step 101: preparing a concrete material, and preparing test blocks 21 with the diameter of 150mm and the height of 150mm according to a test proportion, wherein the number of each test block 21 to be tested is 2;
step 102: the block to be tested is maintained for 28 days or 56 days according to the standard of the test method standard of the physical and mechanical properties of concrete (GB/T50081-2019);
step 103: after the test age is reached, taking out the test block 21, wiping cleanly, and requiring the upper bottom and the lower bottom of the test block 21 to be smooth surfaces, if not smooth, polishing to be smooth, brushing a round surface with the diameter of 60mm on the center part of the upper top surface by using a steel wire brush;
after weighing the test block 21, the test block 21 is saturated with water for more than 8 hours in vacuum, and after saturated with water, the test block 21 is weighed to ensure that the water retention degree is more than 40 percent.
Step 104: performing paraffin and rosin sealing treatment on the surface part of the column body, and airing for 30min at room temperature;
step 105: the upper machine body 13 is inverted on the bench 29, firstly a gasket 19 with the outer diameter of 150mm and the inner diameter of 50mm is placed on the gasket adjusting baffle 17, a layer of paraffin and rosin mixture is coated on the surface of the gasket 19, then the test block 21 is inverted in the test block placing cavity 20, and the gasket 19 is compressed;
the power supply of the temperature control box 31 is turned on, the temperature of the heat tracing belt 30 is increased until paraffin and rosin are melted, a hot pipetting gun is used for injecting the paraffin and rosin solution along the inner wall of the upper machine body 13 until the paraffin and rosin mixture is level with the bottom of the upper machine body 13, the power supply of the temperature control box 31 is turned off, and the solidified paraffin and rosin mixture enables the test block 21 to be completely in sealing joint with the inner wall of the upper machine body 13;
the upper machine body 13 and the lower machine body 22 are connected through screw holes 25 by using a plurality of bolts 27, nuts 26 of the upper machine body 13 and the lower machine body 22 are screwed up, the device is arranged right after standing for 30min, and the water inlet pipe 8 is connected with the water pressure pump 12;
step 106: the water sealing valve 6, the water pressure gauge protection valve 4, the gas sealing valve 1 and the gas pressure gauge protection valve 3 are opened, the water pressure pump 12 is opened, 2/3 of the volume of the upper cavity 14 is filled with water, and the air booster pump 10 is connected;
step 107: closing the water seal valve 6, pressurizing by using the air booster pump 10, wherein the initial pressure is 0.8Mpa, observing the water seepage quantity of the air water outlet 24, and if the water seepage quantity is less than 1.7 x 10 -3 The water pressure is gradually increased by 0.1Mpa in ml/min until the water exudation is stable and is more than or equal to 1.7 x 10 -3 ml/min, the maximum pressure can not exceed 1.5Mpa, and the pressure is kept stable;
step 108: the time and pressure change law obtained through the test uses the Darcy formula:
the water permeability of the test block 21 is calculated:
ΔP＝P i -P a
wherein: q is the average flow per period, V w For the liquid penetration of the test block 21, V1 is the volume of water at the beginning of the test, V n For the volume of water at a certain moment in the test, deltat is the time between every two recordings, deltaP is the differential pressure value, P i To start the air pressure, P a At atmospheric pressure, K w Is water permeability coefficient, mu 2 Is water viscosity coefficient of 0.8949 ×10 -6 (kPa S), L is the concrete block height, and a represents the block cross-sectional area.
Step 109: according to the test method, respectively placing gaskets 19 with inner diameters of 60mm,70mm,80mm,90mm,100mm and 120mm into the gasket adjusting cavity 18, and repeating the steps 105-108;
step 110: drawing according to different contact areas and permeability coefficients, wherein when the permeability coefficients are not changed along with the increase of the contact areas, the contact areas are the minimum contact areas A1;
water penetration test:
step 201: preparing a concrete material, and preparing test blocks 21 with the diameter of 150mm and the height of 150mm according to a test proportion, wherein the number of each test block 21 to be tested is 2;
step 202: the block to be tested is maintained for 28 days or 56 days according to the standard of the test method standard of the physical and mechanical properties of concrete (GB/T50081-2019);
step 203: after the test age is reached, taking out the test block 21, wiping cleanly, and requiring the upper bottom and the lower bottom of the test block 21 to be smooth surfaces, if not smooth, polishing to be smooth, brushing a round surface with the diameter of 60mm on the center part of the upper top surface by using a steel wire brush;
step 204: determining the minimum penetration contact area A1 according to the minimum contact area penetration test, and replacing the inner hole area A2 (A2 > A1) of the gasket 19;
step 205: weighing the test block 21, carrying out vacuum water saturation for more than 8 hours, weighing after water saturation, enabling the water retention degree of the test block 21 to reach more than 40%, carrying out paraffin and rosin sealing treatment on the surface part of the column, and airing for 30 minutes at room temperature;
step 206: calculating the volume of the upper cavity 14, opening the gas sealing valve 1, the gas pressure gauge protection valve 3, the water sealing valve, the water pressure gauge protection valve 6 and the water pressure gauge protection valve 4, opening the water pressure pump 12 to enable water to fill 2/3 of the volume of the upper cavity 14, closing the water sealing valve 6, opening the air booster pump 10 to pressurize, observing the water seepage quantity of the gas water outlet 24 when the initial pressure is 0.8Mpa, and if the water seepage quantity is smaller than 1.7×10 -3 The water pressure is gradually increased by 0.1Mpa in ml/min until the water exudation is stable and is more than or equal to 1.7 x 10 -3 ml/min, the maximum pressure can not exceed 1.5Mpa, and the pressure is kept stable;
step 207: observing the number of the water pressure gauge 6, when the number of the water pressure gauge is stable and the seepage flow of the air and water outlet is stable, starting an experiment, recording the seepage flow of the air and water outlet 24 once every 15-30 minutes, ending the experiment after 16 hours, and clicking an ending button on a computer;
step 208: and calculating the water permeability of the test block 21 according to the time and pressure change rule obtained by the test:
ΔP＝P i -P a
wherein: q is the average flow per period, V w For the liquid penetration of the test block 21, V1 is the volume of water at the beginning of the test, V n For the volume of water at a certain moment in the test, deltat is the time between every two recordings, deltaP is the differential pressure value, P i To start the air pressure, P a At atmospheric pressure, K w Is water permeability coefficient, mu 2 Is water viscosity coefficient of 0.8949 ×10 -6 (kPa S), L is the concrete block height, and a represents the block cross-sectional area.
Gas permeability test method:
step 301: determining a minimum contact area A2 according to a minimum penetration test, and replacing a gasket 19 corresponding to the minimum contact area A3 (A3 > A2);
step 302: preparing a concrete material, and preparing test blocks 21 with the diameter of 150mm and the height of 150mm according to a test proportion, wherein the number of each test block 21 to be tested is 2;
step 303: the block to be tested is maintained for 28 days or 56 days according to the standard of the test method standard of the physical and mechanical properties of concrete (GB/T50081-2019);
step 304: after the test age is reached, taking out the test block 21, wiping cleanly, and requiring the upper bottom and the lower bottom of the test block 21 to be smooth surfaces, if not smooth, polishing to be smooth, brushing a round surface with the diameter of 60mm on the center part of the upper top surface by using a steel wire brush;
weighing the test block 21, putting the test block 21 into an oven, drying for 7 days at a drying temperature of 60 ℃, weighing the dried test block 21, and calculating the initial water content of the test block;
step 305: performing paraffin and rosin sealing treatment on the surface part of the column body, and airing for 30min at room temperature;
step 306: closing the water seal valve 6 and the water pressure gauge protection valve 4, opening the gas seal valve 1, the gas pressure gauge protection valve 3 and the air booster pump 10, and closing the gas seal valve 1 and the air booster pump 10 when the indication number of the gas pressure gauge 2 reaches above 770 kPa;
step 307: observing the indication of the gas pressure gauge 2, clicking a start button on computer 28 software when the indication of the gas pressure gauge 2 is reduced to 750kPa, ending the test when the indication of the gas pressure gauge 2 is reduced to 650kPa, and clicking an end button on the computer;
step 309: the gas permeability of the test block 21 is calculated by using a Darcy formula according to the time and pressure change rule obtained by the test:
ΔP＝P i -P f
ΔP m ＝P m -P a
wherein: p (P) i For the initial pressure in the test, P f To decrease the pressure to a certain value, ΔP is the differential pressure, P m To average pressure of upper cavity in a fixed time, deltaP m P is the upper and lower pressure difference value of the test block n P is the average pressure in the test block a Atmospheric pressure, Q m V is the average flow in the test block t For the upper cavity volume, Δt is the test time, μ 1 Is a gas viscosity coefficient of 2.2X10 -5 (Pa.S), L is the height of the concrete block, A is the cross-sectional area of the block, K g Is the gas permeability coefficient.
According to the concrete water vapor permeability coefficient detection and minimum permeability contact area measurement device provided by the utility model, the contact area can be changed by changing the size of the gasket, and the test of the minimum permeability contact area is researched; closing a water inlet during the gas permeation test to realize that the water permeation test and the gas permeation test are not mutually interfered; the upper cavity can respectively store gas and water, the device can respectively realize the detection tests of three concrete performances of gas permeability, water permeability and minimum permeation contact area of concrete, and has high concentration and multifunction; the upper part of the test block is sealed with the machine body by adopting a paraffin and rosin extrusion sealing mode, so that the problem of difficult sealing in the equipment is solved; the concrete penetration test is carried out in a pressurizing mode, the test pressure range is wide, and the actual test requirement is met; the computer is used for recording and transmitting the pressure gauge and the liquid level data, so that the permeability of the concrete is expressed accurately, rapidly and intuitively in real time, and the permeability of each stage in the concrete permeation process can be observed; the method of injecting the paraffin and rosin mixture liquid is used for tightly fitting and sealing the test block and the side wall, thereby meeting the requirement of sealing the side wall and increasing the sealing performance of the upper part of the test block; the test equipment has small occupied space, light weight and few accessories, is convenient to carry, and can be used for on-site sampling and on-site test.
The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present utility model and the core ideas thereof; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.
Claims (4)
1. The utility model provides a concrete water vapor permeability coefficient detects and minimum infiltration area survey device which characterized in that includes: the test block placing device comprises an upper machine body part, a test block placing part, a lower machine body, a rack and a computer, wherein the lower machine body part is sleeved outside the upper machine body part, the test block placing part is positioned inside the upper machine body part and the lower machine body, the lower machine body is placed on the rack, and the upper machine body part is electrically connected with the computer;
the upper machine body part comprises an air inlet water part, an upper machine body and a liquid level detection device, wherein the air inlet water part is arranged at the top of the upper machine body, an upper cavity is formed in the upper machine body, the liquid level detection device is arranged at the side part of the upper machine body and is communicated with the upper cavity, and the liquid level detection device is electrically connected with the computer;
the inside of the lower machine body is provided with a lower cavity, the bottom of the lower machine body is provided with a gas-water outlet, and the gas-water outlet is communicated with the lower cavity;
the test block placing part comprises a test block placing cavity, a test block fixing piece, a gasket adjusting part and a temperature control device, wherein the bottom of the upper cavity is provided with the test block fixing piece, the upper cavity is communicated with the gasket adjusting part, the bottom of the gasket adjusting part is provided with the test block placing cavity, the bottom of the test block placing cavity is provided with the lower cavity, the junction of the test block placing cavity and the lower cavity is provided with the test block fixing piece, the upper machine body is connected with the lower machine body through the test block fixing piece, the inside of the placing cavity is provided with the test block, and the outer side of the lower part of the upper machine body is provided with the temperature control device.
2. The apparatus for detecting water vapor permeability coefficient and measuring minimum permeation contact area according to claim 1, wherein the air intake water portion comprises an air intake portion and a water intake portion;
the water inlet part comprises a water tank, a water pressure pump and a water inlet pipe, wherein the water tank is provided with the water pressure pump, the water pressure pump is connected with the water inlet pipe, the water inlet pipe is communicated with the upper cavity, the water inlet pipe is provided with a water sealing valve, a water pressure gauge protection valve and a water pressure Jiang Biansong device, and the water pressure Jiang Biansong device is electrically connected with the computer;
the air inlet part comprises an air booster pump and an air inlet pipe, the air booster pump is connected with the air inlet pipe, the air inlet pipe is communicated with the upper cavity, a gas sealing valve, a gas pressure gauge protection valve and a gas pressure transmitter are arranged on the air inlet pipe, and the gas pressure transmitter is electrically connected with the computer.
3. The device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of the concrete according to claim 1, wherein the test block fixing piece comprises a gasket adjusting baffle, a fixing plate, a nut and a screw, the gasket adjusting baffle is arranged at the junction of the gasket adjusting part and the upper cavity, the fixing plate is arranged at the junction of the test block placing cavity and the lower cavity, a plurality of screw holes are correspondingly arranged on the gasket adjusting baffle and the fixing plate, and the screw penetrates through the screw holes and is fixed through the nut;
the gasket adjusting part comprises a gasket and a gasket adjusting area, the gasket is placed in the gasket adjusting area, and the gasket is arranged between the lower part of the gasket adjusting baffle and the upper part of the test block;
the diameter of the test block is smaller than that of the test block placing cavity, paraffin and rosin mixture are roll-coated on the side face of the test block, the gasket adjusting baffle, the gasket and the fixing plate are hollow, and paraffin and rosin mixture are coated on the upper contact surface and the lower contact surface of the gasket.
4. The device for detecting the water vapor permeability coefficient and measuring the minimum permeability contact area of the concrete according to claim 1, wherein the liquid level detection device comprises a liquid level meter and a liquid level meter automatic reader, the liquid level meter is arranged on the outer side part of the upper cavity and communicated with the interior of the upper cavity, the liquid level meter is provided with the liquid level meter automatic reader, and the liquid level meter automatic reader is in communication connection with a computer;
the temperature control device comprises a heat tracing band and a temperature control box, wherein the heat tracing band is wound outside the lower half part of the upper machine body, and the temperature control box is electrically connected with the heat tracing band.
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| CN202222969088.0U CN219046063U (en) | 2022-11-08 | 2022-11-08 | Concrete water vapor permeability coefficient detection and minimum permeation contact area measurement device |
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| CN202222969088.0U CN219046063U (en) | 2022-11-08 | 2022-11-08 | Concrete water vapor permeability coefficient detection and minimum permeation contact area measurement device |
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