CN109991121A - The infiltrative test method of concrete gas is tested using concrete pipe test specimen - Google Patents
The infiltrative test method of concrete gas is tested using concrete pipe test specimen Download PDFInfo
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- CN109991121A CN109991121A CN201711497102.9A CN201711497102A CN109991121A CN 109991121 A CN109991121 A CN 109991121A CN 201711497102 A CN201711497102 A CN 201711497102A CN 109991121 A CN109991121 A CN 109991121A
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- 239000004567 concrete Substances 0.000 title claims abstract description 102
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 238000010998 test method Methods 0.000 title claims abstract description 6
- 230000035699 permeability Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 239000000344 soap Substances 0.000 claims abstract description 3
- 230000008859 change Effects 0.000 abstract description 5
- 238000004088 simulation Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 27
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fluid Mechanics (AREA)
- Dispersion Chemistry (AREA)
- Examining Or Testing Airtightness (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention belongs to the field of building materials, to test the infiltrative test method of concrete gas using concrete pipe test specimen, make concrete pipe test specimen using concrete pipe prefabricated mould, and conserve at the standard conditions to test specimen；Concrete pipe test device is assembled；It is first filled with a certain amount of gas into concrete pipe, is hunted leak using soap bubble method to inflating port and device seam crossing, it is ensured that device air-tightness is good；A certain amount of gas is filled with into concrete pipe, using pressure sensor to the draught head inside and outside concrete pipe change with time situation carry out real-time monitoring；Test macro is modeled using COMSOL Multiphysics software, test data is inputted in modeler model and is compared, and then calculates the concrete tube wall i.e. gas permeability of concrete material.The present invention situation that can change with time to the draught head inside and outside concrete pipe is monitored, and goes out the gas permeability of concrete material by numerical simulation calculation.
Description
Technical field
The invention belongs to the field of building materials, it is related to the test for concrete material gas permeability, the test provided
Device can accurately measure the gas permeability of concrete material, have important practical value.
Background technique
Concrete is a kind of porous material, and the presence in hole consumingly affects the properties such as its intensity, toughness, in concrete
The pore structure in portion be even more with the durabilities such as its permeability, air-tightness, corrosion resistance in terms of performance it is closely bound up.Permeability is mixed
One of the main indicator of solidifying soil durability, mainly uses 2 class permeating mediums: water and gas when measuring the performance at present.With water
When for permeating medium, since the continuation aquation of cement, the migration of substance, change of capillary pipe structure etc. make process of osmosis be difficult to reach
More difficult measure of infiltration coefficient to stable state, therefore water accurately causes the interest of research to be increasingly turned to using gas as permeating medium
Test method.Due to the differences such as experimental principle, preprocess method, the test of concrete gas permeability (referred to as air infiltration)
There are commonly following several for method: 1. Figg is on 1973,85:213-219, Magazine of Concrete Research
The article of " Methods of measuring the air and water permeability of concrete " is delivered,
Wherein describe a kind of method for testing concrete material air infiltration.Its principle are as follows: it is 5.5mm, depth that a diameter is bored on sample
The hole of 30mm is spent, surface seals with rubber stopper, and is vacuumized in syringe insertion rubber stopper, measures pressure from 15kN/m2Increase
To 20kN/m2The required time, to calculate air infiltration coefficient.Figg method is more sensitive to porosity, moisture content, durable with concrete
Property correlation is good, but sealing effect is undesirable.2. Kollek is in 1989,3:225-230, Materials and
" The determination of the permeability of concrete to oxygen is delivered on Structures
The article of by the Cembureau method-a recommendation ", describes Cembureau method.Its principle are as follows: with
O2Concrete filtration coefficient is measured for permeating medium, applies stable air pressure to sample, record passes through sample at this pressure
Gas flow is reconverted into infiltration coefficient, compares concrete permeability energy with this.For the seal request for meeting sample periphery,
Using the structure of rubber-tyred.The disadvantage of this method is that testing procedure is stringent, program is complicated.3. stone is bright equal 2012,
10:11-15 delivers the article of " TORRENT method tests the research of concrete air permeance property " on " concrete and cement products ",
Wherein describe TORRENT method.It is tested using negative pressure sucking disc type, without sealing, is suitble to on-the-spot test, but error is larger.
Document above through enumerating shows both at home and abroad to the test of concrete material gas permeability by small size
Concrete test block realize, based on Thickwalled cylinder concrete sample (concrete pipe) to the infiltrative test method of material gas not yet
It appears in the newspapers.
Summary of the invention
Goal of the invention: concrete gas permeability is tested using concrete pipe test specimen the object of the present invention is to provide a set of
Device, be monitored using its situation that can change with time to the draught head inside and outside concrete pipe, and pass through numerical simulation meter
Calculate the gas permeability of concrete material.
Technical solution: to achieve the above object, the invention adopts the following technical scheme: using in the production of concrete pipe prefabricated mould
The concrete pipe test specimen of diameter 30cm, outer diameter 42cm, height 40cm, and test specimen is conserved at the standard conditions；Concrete pipe is tested and is filled
It sets and assembles；Before test, it is first filled with a certain amount of gas into concrete pipe, inflating port and device seam crossing are carried out using soap bubble method
Leak detection, it is ensured that device air-tightness is good, then is tested；When test, it is filled with a certain amount of gas into concrete pipe, is passed using pressure
Sensor to the draught head inside and outside concrete pipe change with time situation carry out real-time monitoring, and with recording instrument without paper acquire data；It will
Concrete pipe internal and external pressure difference delta data is arranged；Test macro is modeled using COMSOL Multiphysics software,
Test data is inputted in modeler model and is compared, and then calculates the concrete tube wall i.e. gas permeability of concrete material.
The utility model has the advantages that compared with prior art, present invention is characterized in that the present invention is realized to concrete material gas
Infiltrative test.The test device of offer not only can intuitively reflect that concrete pipe internal and external pressure difference changes with time situation, and
And the concrete tube wall i.e. gas permeability of concrete material can be gone out by numerical simulation calculation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of concrete pipe prefabricated mould；
Fig. 2 is the structural schematic diagram of concrete pipe test device；
Fig. 3 is concrete pipe inside and outside differential pressure time history plot.
Specific embodiment
Hardware connection of the present invention is accomplished by
As shown in Figure 1, this concrete pipe prefabricated mould is by die bottom plate 1, outer wall mold 2, buckle 3, interior wall mould 4, inner wall mould
Have stripping 5, top plate 6, nut 7, center bolt 8 and bolt 9 to constitute.3 outer wall molds 2 are spliced to form concrete pipe prefabricated mould
Outer wall is fixedly connected with buckle 3 therebetween；It is fixedly connected between outer wall mold 2 and die bottom plate 1 with bolt 9；2 interior wall moulds 4
It is spliced to form concrete pipe prefabricated mould inner wall with 2 interior wall mould strippings 5, is fixedly connected therebetween with buckle 3, in spliced mold
Add top plate 6 on wall；It is connected between top plate 6, mould inner wall and die bottom plate 1 with the perforation of center bolt 8, and in screw tip spiral shell
Mother 7 is fixed, i.e., concrete pipe prefabricated mould is fully assembled.Concrete mix is poured into assembled concrete pipe prefabricated mould,
Demoulding after for 24 hours, can be obtained concrete prefabricated pipe 10.
As shown in Fig. 2, this concrete pipe test device is by lower flange 1, gasket 2, concrete prefabricated pipe 3, screw rod 4, upper flange 5, pad
Circle 6, nut 7, DN Vacuum ball valve 8, ring mouth 9 and barometer 10 form.In use, concrete prefabricated pipe 3 is placed in lower flange 1 and upper
Between flange 5, with gasket 2 and plus vacuum mud sealing between concrete pipe and flange；With 7 pad washer 6 of nut by 4 both ends of screw rod with it is upper
Lower flange is fixed, and nut is tightened, and keeps concrete pipe, gasket and flange linking close；Upper flange has threaded hole to connect DN vacuum sphere
Valve 8 and ring mouth 9, ring mouth can be connected by hose with air compressor machine or gas cylinder, enter gas inside concrete pipe；Upper flange separately has
Threaded hole accesses barometer 10, and barometer connects recording instrument without paper, the monitoring to concrete intraductal atmospheric pressure situation can be realized.
The present invention is further described according to embodiment.
Embodiment: it according to quality mixture ratio numerical value concrete batching mixture shown in table 1, pours into concrete pipe prefabricated mould
Moulding by casting is demoulded after 1d, is conserved at the standard conditions.
1 concrete tube material match ratio of table
The concrete pipe prepared is accessed in concrete pipe test device, concrete intraductal atmospheric pressure is charged to and is higher by more than 20 kPas of ambient pressure
Afterwards, the concrete pipe inside and outside differential pressure situation that changes with time is as shown in Figure 3.
According to test observation data, one-dimensional model is established, using numerical simulation inverting, obtains the gas of this kind of concrete material
Body permeability is 8.0 × 10-16m2。
The device that the present invention tests concrete gas permeability using concrete tube material test specimen, can be to concrete pipe inside and outside
The draught head situation that changes with time be monitored, and go out the gas permeability of concrete material by numerical simulation calculation.
It makes internal diameter 30cm, the concrete pipe test specimen of outer diameter 42cm, height 40cm, weight percent shared by each component using concrete pipe prefabricated mould
Than are as follows: 32.5 class g cement of PC accounts for 13-15%, and middle sand accounts for 30-35%, and stone accounts for 45-48%.
Concrete tube material test specimen by die bottom plate, outer wall mold, buckle, interior wall mould, interior wall mould stripping, top plate, nut,
Center bolt and bolt are constituted；Outer wall mold is spliced to form concrete pipe prefabricated mould outer wall, is fixedly connected therebetween with buckle；Outer wall mold
Tool is fixedly connected between die bottom plate with bolt；It is prefabricated that two interior wall moulds and two interior wall mould strippings are spliced to form concrete pipe
Mould inner wall is fixedly connected with buckle therebetween, is penetrated through and is connected with center bolt between top plate, mould inner wall and die bottom plate.
Concrete prefabricated pipe is placed between lower flange and upper flange by gas permeability device, uses gasket between concrete pipe and flange
And add the sealing of vacuum mud, screw rod both ends and upper lower flange are fixed with nut pad washer, nut is tightened, concrete pipe, gasket are made
It is close with flange linking.The gas of gas permeability device is passed through mode: upper flange has threaded hole connection Vacuum ball valve and ring
Mouth, ring mouth can be connected by hose with air compressor machine or gas cylinder, enter gas inside concrete pipe.Air pressure monitoring device: upper flange
Separately there is threaded hole to access barometer, barometer connects recording instrument without paper, the monitoring to concrete intraductal atmospheric pressure situation can be realized.
The present invention can accurately measure the gas permeability of concrete material, have important practical value.
Claims (1)
1. a kind of test the infiltrative test method of concrete gas using concrete pipe test specimen, it is characterised in that: prefabricated using concrete pipe
The concrete pipe test specimen of Mold Making internal diameter 30cm, outer diameter 42cm, height 40cm, and test specimen is conserved at the standard conditions；It will
Concrete pipe test device assembles；Before test, a certain amount of gas is first filled with into concrete pipe, using soap bubble method to inflating port and device
Seam crossing is hunted leak, it is ensured that device air-tightness is good, then is tested；When test, a certain amount of gas is filled with into concrete pipe,
Real-time monitoring is carried out to the situation that changes with time of the draught head inside and outside concrete pipe using pressure sensor, and is adopted with recording instrument without paper
Collect data；Concrete pipe internal and external pressure difference delta data is arranged；Using COMSOL Multiphysics software to test macro
It is modeled, test data is inputted in modeler model and is compared, and then calculates the concrete tube wall i.e. gas of concrete material
Permeability.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711497102.9A CN109991121B (en) | 2017-12-31 | 2017-12-31 | Test method for testing gas permeability of concrete by using concrete pipe test piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711497102.9A CN109991121B (en) | 2017-12-31 | 2017-12-31 | Test method for testing gas permeability of concrete by using concrete pipe test piece |
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| Publication Number | Publication Date |
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| CN109991121A true CN109991121A (en) | 2019-07-09 |
| CN109991121B CN109991121B (en) | 2022-04-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441217A (en) * | 2019-08-30 | 2019-11-12 | 舟山市博远科技开发有限公司 | A kind of permeation unit of concrete test block and analyzer with the permeation unit |
| CN113959921A (en) * | 2021-09-23 | 2022-01-21 | 宁波市杭州湾大桥发展有限公司 | Device and method for testing impermeability and durability of precast concrete joint |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110441217A (en) * | 2019-08-30 | 2019-11-12 | 舟山市博远科技开发有限公司 | A kind of permeation unit of concrete test block and analyzer with the permeation unit |
| CN113959921A (en) * | 2021-09-23 | 2022-01-21 | 宁波市杭州湾大桥发展有限公司 | Device and method for testing impermeability and durability of precast concrete joint |
| CN113959921B (en) * | 2021-09-23 | 2023-09-26 | 宁波市杭州湾大桥发展有限公司 | Device and method for testing impermeability and durability of precast concrete joint |
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| CN109991121B (en) | 2022-04-12 |
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