CN100487419C - Annular detecting instrument for concrete gas seepage coefficient and detecting method - Google Patents

Annular detecting instrument for concrete gas seepage coefficient and detecting method Download PDF

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Publication number
CN100487419C
CN100487419C CNB2006100236626A CN200610023662A CN100487419C CN 100487419 C CN100487419 C CN 100487419C CN B2006100236626 A CNB2006100236626 A CN B2006100236626A CN 200610023662 A CN200610023662 A CN 200610023662A CN 100487419 C CN100487419 C CN 100487419C
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China
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sample
infiltration coefficient
concrete
tested sample
testing
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CNB2006100236626A
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Chinese (zh)
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CN1815174A (en
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王中平
施惠生
李启令
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同济大学
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Abstract

Said invention refers to concrete gaseous permeability coefficient annular tester and testing method belonging to concrete material viability detection technique field. It contains cover board, housing, flowmeter, seal ring, and tested sample, wherein cover board housing top, tested sample located in housing with cylindrical form outer wall, inner hollow, toroidal shape cross section, U shape longitudinal section, sealing gasket set in top and bottom of tested sample, one housing side air inlet connected with compressed gas tank, cover board centre with connection porthole, hollow part of tested sample connected with flow instrument through said connection porthole. In testing, tested sample is located in housing, opening compressed gas tank valve, testing sample air permeability, keeping tested sample equilibration time being 10-20 minute, each group tested sample repeating by 3-5 times, changing test pressure and repeat testing, testing tested sample gas flow to obtain tested sample permeability coefficient average value, taking 3-5 tested sample permeability coefficient average value as test value of said group tested sample. Said invention has high accuracy, fine testing repeatability, fine sealed effect, reliable test result, easy and simple to handle etc advantages.

Description

Concrete gas infiltration coefficient annular tester and method of testing thereof

Technical field

The invention belongs to concrete material permanance detection technique field, be specifically related to a kind of concrete gas infiltration coefficient annular tester and method of testing thereof.

Background technology

Improving concrete permanance, prolong concrete actual life, is the emphasis of current concrete academia research, and its key is to control concrete perviousness, characterizes concrete permeance property, by permeating medium water and O is arranged 2, N 2, air etc. infiltration coefficient because test speed and the stable requirement of low pressure, research emphasis is the steady-state permeation aspect of gas.

With gas is the infiltration coefficient method of testing of tested media, and at present commonly used have Figg method and a Cembureau method.

The Figg method is measured the method that concrete density belongs to half breakage, during test, bore the aperture of 10mm at concrete surface, the about 40mm of the degree of depth, to squeeze into a rubbery stopper of being close to hole wall after the floating ash removing in the hole, form the zone of a sealing in the bottom in hole, put on a small needle tube again at the center of rubber plug, the vacuum pump of the external band valve of this needle tubing, during experiment sealing area is vacuumized, absolute pressure value in the zone is less than 0.45MPa, close vacuum pump, because the leakage of concrete micropore, vacuum tightness will progressively reduce in time, the index of its measurement is that the absolute pressure in the sealing area changes to the time that 0.50MPa will spend from 0.45MPa, and unit is second.Though the method equipment needed thereby is simple and easy, sealing effectiveness is undesirable.The repeatability of test findings and reliability are subjected to the query of academia.

1989, Kollek proposed with O 2Cembureau method for permeating medium mensuration concrete infiltration coefficient obtains international accepting extensively.Its principle is: apply stable air pressure to sample, be recorded under this pressure by the gas flow of sample, be transformed into infiltration coefficient again, with this concrete permeability energy relatively.This method has adopted the hermetically-sealed construction of rubber-tyred, and sealing effectiveness is very desirable.Its test procedure is also very strict, the test procedure complexity.But this method exists experimental implementation too loaded down with trivial details, and equipment needed thereby is huge, the shortcoming that the loading and unloading of sample are hard.

Therefore, study a kind of easy and simple to handle, good sealing effect, the portable concrete gas infiltration coefficient of equipment method of testing is those skilled in the art's a goal in research.

Summary of the invention

The objective of the invention is to propose a kind of easy and simple to handle, good sealing effect, the portable concrete gas infiltration coefficient annular tester of equipment and method of testing thereof.

The concrete gas infiltration coefficient annular tester that the present invention proposes, by cover plate 1, shell 2, flowmeter 8, O-ring seal 5 and sample 3 are formed, wherein, cover plate 1 is the T font, cover plate is positioned at the top of shell 2, cover plate 1 and shell 2 are by being threaded, cover plate 1 bottom and shell 2 junctions are provided with O-ring seal 5, and the outer wall of sample 3 is cylindrical, its boring, it is circular that xsect is, the longitudinal section is the U font, and sample 3 places in the shell 2, the top of sample 3, the bottom is equipped with sealing gasket 4, to guarantee the sealing at this position, one side of shell 2 is provided with air intake opening 6, and air intake opening 6 connects compression gas tank 7 by valve, and the center of cover plate 1 is provided with and connects duct 10, this connects the boring position that duct 10 1 ends connect sample 3, and the other end is by flexible pipe 9 connection traffic meters 8.

Among the present invention, described O-ring seal 5 is an O type rubber seal.

Among the present invention, described sealing gasket 4 is the vacuum rubber sealing gasket.

Among the present invention, the external diameter of described sample 3 is 150~200mm, and internal diameter is 80~110mm, and outer form height is 160~200mm, and the inner chambers height is 130~150mm.

The method of testing of the concrete gas infiltration coefficient annular tester that the present invention proposes, concrete steps are as follows:

(1) will reach the regulation sample oven dry in the length of time, sample places in the shell, tighten the nut of shell and cover plate connecting portion, open the pressure gas tank valve, the permeability of test sample, keeping the equilibration time of sample is 10 minutes~20 minutes, so that may be in the sample by all being full of the gas that is seen through in the passage of gas, under same test condition, each sample repeats 3~5 times, test sees through the gas flow of sample, tries to achieve sample infiltration coefficient mean value, and the relative error of gained data on flows is less than 10%;

(2) change test pressure, repeat above test, test sees through the gas flow of sample, tries to achieve sample infiltration coefficient mean value, gets the test value of 3-5 sample infiltration coefficient mean value as this group sample; Wherein the infiltration coefficient of sample calculates by following formula:

D = 2 QLμ P a A ( P 2 - P a 2 )

In the formula: D---concrete gas infiltration coefficient (m 2)

P a---local atmospheric pressure (Pa)

The absolute pressure of P---gas inlet end (Pa)

Q---gas flow (m 3/ s)

The thickness of L---sample (m)

μ---aerodynamic force viscosity (Ns/m 2)

A---the inner wall area (m of sample internal diameter correspondence 2) (A=π Φ 4H).(Φ 4Expression sample internal diameter, h represents sample inner chambers height).

Among the present invention, the described gas medium that sees through is O 2, N 2, air or CO 2Deng.

Among the present invention, the described pressure that sees through gas is 0.15MPa~0.3MPa.

Beneficial effect of the present invention: test philosophy of the present invention builds on the Darcy's law, and concrete gas infiltration coefficient computation model is simple, and its test form is original creation.Compare the present invention with the Figg method and have higher degree of accuracy, the repeatability of test is good, good sealing effect, and characteristics such as reliable test result are compared the present invention and are had easy and simple to handlely with the Cembureau method, and equipment is small and exquisite, be easy to carry, and measuring accuracy is suitable with it.

Description of drawings

Fig. 1 is a structural diagrams of the present invention.

Number in the figure: 1 is cover plate, and 2 is shell, and 3 is sample, and 4 is sealing gasket, and 5 is O-ring seal, and 6 is air intake opening, and 7 is compression gas tank, and 8 is flowmeter, and 9 is flexible pipe, and 10 is the duct of cover plate.

Embodiment

The invention is further illustrated by the following examples.

Embodiment 1: following each parts are connected by mode shown in Figure 1, and the person skilled in art all can smooth implementation.Cover plate 1 adopts A3 steel, its size upper edge diameter 220mm, lower edge diameter 211mm; Shell 2 adopts the A3 steel, and its physical dimension is diameter 236mm, height overall 230mm; Sample is of a size of external diameter 200mm, internal diameter 110mm, the high 150mm of inner chambers, wall thickness 45mm; Sealing gasket 4 adopts the thick vacuum rubber sealing gasket of 3mm, and O-ring seal 5 adopts the O shape rubber seal of 206 * 5.30G GB3452.1, and air intake opening 6 is of a size of diameter 18mm; Compression gas tank 7 is the industrial nitrogen steel cylinder; Flowmeter 8 is a soap film flowmeter; Flexible pipe 9 vacuum rubber pipes; The channel diameter of cover plate is diameter 18mm.

Embodiment 2: method of testing

Press table 1 match ratio moulding sample, specifically be of a size of: external diameter 200mm, internal diameter 110mm, the high 150mm of inner chambers, wall thickness 45mm.

To reach the above-mentioned concrete sample oven dry in the 28 day length of time, place in the shell, tighten shell and cover plate attaching nut, open the pressure gas tank valve, feed N 2, air pressure is transferred to first force value 0.15MPa of appointment, kept in the sample duration of ventilation 20 minutes, begin to test gas flow through sample, write down this flow value; Change test pressure and be respectively 0.2MPa, 0.3MPa, repeat above test, write down the test value of various conditions, press D = 2 QLμ P a A ( P 2 - P a 2 ) Try to achieve sample infiltration coefficient value, get the test value of three sample infiltration coefficient mean values as this group sample; Test result sees Table 2.

Table 1 experiment concrete mix

Table 2 concrete infiltration coefficient is tabulating unit as a result: * 10 -17m 2

Claims (7)

1, concrete gas infiltration coefficient annular tester, by cover plate (1), shell (2), flowmeter (8), O-ring seal (5), sample (3) is formed, it is characterized in that, cover plate (1) is the T font, cover plate (1) is positioned at the top of shell (2), cover plate (1) and shell (2) are by being threaded, cover plate (1) bottom is provided with O-ring seal (5) with shell (2) junction, the outer wall of sample (3) is cylindrical, its boring, it is circular that xsect is, the longitudinal section is the U font, sample (3) places in the shell (2), the top of sample (3), the bottom is equipped with sealing gasket (4), to guarantee the sealing at this position, one side of shell (2) is provided with air intake opening (6), the center of cover plate (1) is provided with and connects duct (10), and this connects the boring position that duct (10) one ends connect sample (3), and the other end is by flexible pipe (9) connection traffic meter (8).
2, concrete gas infiltration coefficient annular tester according to claim 1 is characterized in that described O-ring seal (5) is O type rubber seal.
3, concrete gas infiltration coefficient annular tester according to claim 1 is characterized in that described sealing gasket (4) is the vacuum rubber sealing gasket.
4, concrete gas infiltration coefficient annular tester according to claim 1, the external diameter that it is characterized in that described sample (3) is 150~200mm, and internal diameter is 80~110mm, and outer form height is 160~200mm, and the inner chambers height is 130~150mm.
5, a kind of method of testing of concrete gas infiltration coefficient annular tester as claimed in claim 1 is characterized in that concrete steps are as follows:
(1) will reach the regulation sample oven dry in the length of time, sample places in the shell, tighten the nut of shell and cover plate connecting portion, open the pressure gas tank valve, the permeability of test sample, keeping the equilibration time of sample is 10 minutes~20 minutes, under same test condition, each sample repeats 3~5 times, and test sees through the gas flow of sample, try to achieve sample infiltration coefficient mean value, the relative error of gained data on flows is less than 10%;
(2) change test pressure, repeat above test, test sees through the gas flow of sample, tries to achieve sample infiltration coefficient mean value, gets the test value of 3-5 sample infiltration coefficient mean value as this group sample; Wherein the infiltration coefficient of sample calculates by following formula:
D = 2 QLμ P a A ( P 2 - P a 2 )
In the formula: D---concrete gas infiltration coefficient, unit are m 2,
P a---local atmospheric pressure, unit is Pa,
The absolute pressure of P---gas inlet end, unit is Pa,
Q---body flow, unit are m 3/ s,
The thickness of L---sample, unit are m,
μ---aerodynamic force viscosity, unit is Ns/m 2,
A---the inner wall area of sample internal diameter correspondence, unit are m 2, wherein, A=π Φ 4H, Φ 4Expression sample internal diameter, h represents sample inner chambers height.
6, the method for testing of concrete gas infiltration coefficient annular tester according to claim 5 is characterized in that the described gas medium that sees through is O 2, N 2, air or CO 2
7, the method for testing of concrete gas infiltration coefficient annular tester according to claim 5 is characterized in that the described pressure that sees through gas is 0.15MPa~0.3MPa.
CNB2006100236626A 2006-01-26 2006-01-26 Annular detecting instrument for concrete gas seepage coefficient and detecting method CN100487419C (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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CN100487419C true CN100487419C (en) 2009-05-13

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101271103B (en) * 2008-05-16 2010-12-22 东南大学 Experimental device for concrete multifactor permanent stability under co-action of pulling stress and surroundings
CN101813596B (en) * 2010-05-11 2011-07-20 中国科学院地质与地球物理研究所 Method for testing osmotic coefficient of non-saturated gas phase of soil body
CN102636424B (en) * 2012-04-24 2013-12-18 中煤科工集团重庆研究院 Method and device for measuring coal rock adsorption gas quantity and permeability
ES2406386B1 (en) * 2013-02-19 2014-03-04 Universidad De Cantabria System for determining the permeability of a material to a gas
ES2406360B1 (en) * 2013-02-19 2014-03-04 Universidad De Cantabria Method of measuring the permeability of a material to a gas
CN103245596A (en) * 2013-05-14 2013-08-14 南京工程学院 Method for determining gas permeability coefficient of concrete
CN104880394B (en) * 2015-05-04 2017-12-26 同济大学 A kind of concrete air infiltration test equipment and its method of testing
CN105158138B (en) * 2015-08-05 2018-01-05 宁波大学 A kind of soil body device for checking air permeability
CN105758776B (en) * 2016-02-26 2018-09-14 山东省交通规划设计院 A kind of test method that structure surface layer permeability is tested using tester
CN106092855A (en) * 2016-07-07 2016-11-09 中国电建集团贵阳勘测设计研究院有限公司 The device of a kind of seepage proof curtain simulation test and test method
CN107101928A (en) * 2017-05-27 2017-08-29 中煤科工集团重庆研究院有限公司 A kind of non-linear device for testing permeability coefficient of coal petrography and method

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The relative permeability of concrete using nitrogen gas. F.D.Lydon.Construction and Building Materials,Vol.7 No.4. 1993
The relative permeability of concrete using nitrogen gas. F.D.Lydon.Construction and Building Materials,Vol.7 No.4. 1993 *
混凝土气体渗透系数测试方法的研究. 王中平,吴科如,张青云,柳宗耀.建筑材料学报,第4卷第4期. 2001
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