CN101986137B - Air speed control device used in plastic cracking test of concrete - Google Patents
Air speed control device used in plastic cracking test of concrete Download PDFInfo
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- CN101986137B CN101986137B CN 201010286434 CN201010286434A CN101986137B CN 101986137 B CN101986137 B CN 101986137B CN 201010286434 CN201010286434 CN 201010286434 CN 201010286434 A CN201010286434 A CN 201010286434A CN 101986137 B CN101986137 B CN 101986137B
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Abstract
The invention discloses an air speed control device used in a plastic cracking test of concrete. The device comprises an air source, wherein the air source is connected with a return pipeline for uniformly mixing air; the return pipeline is provided with more than one return pipeline air outlet; and the return pipeline air outlet is provided with a plurality of air outlet holes which are formed uniformly and is connected with an air outlet pipe (6). The air speed at the air outlet is varied by varying the model number of a centrifugal blast blower and the angle between the upper surface of the outlet of the air outlet pipe and a horizontal plane, so that effective control over the air speed is realized, the problems of instable and non-uniform air speed caused by a fan are solved and the accuracy and repeatability of a test result are enhanced. The air speed control device can be used in the plastic cracking test of the concrete and a water evaporation test of the concrete in a plastic state, such as the effects of different curing modes and curing agents on the water evaporation of the concrete.
Description
Technical field
What the present invention relates to is a kind of air speed control device, and what be specifically related to is a kind of air speed control device for the test of concrete plastic cracking.
Background technology
High performance concrete (High performance concrete, HPC) be a kind of novel High Technique Concrete, because it has a series of good characteristic, such as high strength, high-durability, high workability, high fluidity etc., is widely used in a lot of important engineerings.Yet in practical engineering application, crack especially early crack is the ubiquitous problem of modern concrete structure, and it has had a strong impact on security and the permanance of xoncrete structure.
Plastic shrinkage cracks is the important component part of early crack.Fresh concrete (high temperature, low humidity, strong wind and direct sunlight etc.) under mal-condition causes the rapid evaporation of concrete surface moisture easily, and causes the generation in Plastic Shrinkage of Concrete crack.Therefore, the true environment condition that simulation concrete stands is studied different concrete plastic cracking performances, to seeking method and the rule of suitable minimizing cracking, has important Research Significance.
The environment control of plastic cracking testing laboratory mainly comprises four aspects such as temperature, humidity, wind speed and illumination.Wind speed is as important external environment condition, and evaporation has larger impact on moisture, when specimen surface has wind, has been equivalent to blow away the moisture of evaporation, so that air pressure reduces, cause the lasting evaporation of moisture, and wind speed is larger, and this impact is further obvious.
U.S. ASTM C1579-06 proposes the canister design about plastic cracking, and the inside relates to the control of wind speed, but does not at present domesticly also have the set of equipments of standard available.Have the scholar to propose, still there is certain problem in the wind regime that the plastic cracking test is adopted, needs further to study and improve.The majority that offers at present concrete sample surface wind regime is fan, but because the wind regime that provides of fan exists wind speed unstable and in the wind speed of fan diverse location problem not of uniform size, caused the deviation of test findings, affected the correct evaluation of concrete plastic cracking performance, therefore realized that effective control of wind speed seems particularly important.
Summary of the invention
For the deficiency that exists on the prior art, the present invention seeks to be according to hydromechanical principle, shape and size by design return and discharge pipe, a kind of air speed control device for the test of concrete plastic cracking is provided, realize the effective control to wind speed, improved accuracy and the repeatability of concrete plastic cracking test findings.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of air speed control device for the test of concrete plastic cracking, comprise wind regime and make the mixed uniformly return of wind, return is provided with 1 above return air outlet, the return air outlet is provided with some air outlet openings arranged in a uniform, is connected with discharge pipe on the return air outlet.
Above-mentioned return comprises pipeline, the threeway that is connected with wind regime and pipeline is connected into the elbow in loop.
Above-mentioned pipeline is pvc pipe, and PCV pipe nominal outside diameter is 100～150mm.
Above-mentioned wind regime is connected by the hemispherical dome joint with threeway.
Above-mentioned wind regime is centrifugal blower.Adopt centrifugal blower as wind regime so that wind speed is more stable, even, and improved accuracy and the repeatability of experimental result, in actual application, can select the fan blower of different model as required, realize the effective control to wind speed.
Above-mentioned air outlet opening is provided with 2～6 rows, and it is 8～10mm that every row is provided with diameter, and number is that 5～15 large air outlet opening and diameter is 4～6mm, the little air outlet opening that number is 5～15.So that the wind that blows out from the return air outlet passes through discharge pipe with certain pressure.
Above-mentioned large air outlet opening and little air outlet opening are spaced.Large and small span is arranged so that wind speed is more stable, even.
Above-mentioned discharge pipe be shaped as Z-type, the length of discharge pipe is 400～500mm, width is 100～120mm, what discharge pipe adopted is that plank or iron plate process.The shape of discharge pipe is set to Z-type so that the wind that blows out from discharge pipe more evenly, stable.
Above-mentioned discharge pipe is provided with the discharge pipe outlet that is shaped as Duckbill type, and discharge pipe outlet lower surface is parallel with surface level.
The angle of above-mentioned discharge pipe outlet upper surface and surface level is 5～15 °.By the angle of upper surface and surface level is set, can change the size of wind speed, realize the effective control to wind speed.
The present invention can change the model of centrifugal blower, and major parameter is flow and total head, changes the wind speed of air outlet, realizes effective control of wind speed; Can be embodied in the size of air outlet area by changing the angle of discharge pipe outlet upper surface and surface level, change the wind speed of air outlet, realize effective control of wind speed; Not only solve the unstable and inhomogeneous problem of wind speed that fan brings, and improved accuracy and the repeatability of test findings; This air speed control device not only can be used in the test of concrete plastic cracking, can also be applied to the moisture evaporation test under the concrete mecystasis, such as the impact on concrete water evaporation of more different maintenance methods and sealing compound.
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the structural representation of return air outlet of the present invention;
Fig. 2 is the structural representation of discharge pipe of the present invention side;
The structural representation of Fig. 3 air speed control device of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
Air speed control device of the present invention comprises wind regime and the return that is connected with wind regime.Wind regime is centrifugal blower 1.The threeway 3 that return comprises pipeline, be connected with wind regime and pipeline connected into the elbow 5 in loop, pipeline is pvc pipe 4, and the nominal outside diameter of pvc pipe 4 is 100～150mm, and wind regime is connected by hemispherical dome joint 2 with threeway 3.Return is provided with an above return air outlet, the return air outlet is provided with some air outlet openings arranged in a uniform, air outlet opening is provided with 2～6 rows, it is 8～10mm that every row is provided with diameter, number is that 5～15 large air outlet opening 8 and diameter is 4～6mm, the little air outlet opening 7 that number is 5～15, large air outlet opening 8 is spaced with little air outlet opening 7.Be connected with discharge pipe 6 on the return air outlet, discharge pipe 6 be shaped as Z-type, the length of discharge pipe 6 is 400～500mm, width is 100～120mm, what discharge pipe 6 adopted is that plank or iron plate process, discharge pipe 6 is provided with the discharge pipe outlet 9 that is shaped as Duckbill type, and it is parallel with surface level that discharge pipe exports 9 lower surfaces, and the angle of its upper surface and surface level is 5～15 °.
Present embodiment adopts the new centrifugal blower 1 that produces humorously in Shandong as wind regime, its model and Specifeca tion speeification see Table 1, at four air outlet positions of return design, divide four rows, 10～11 in the hole that every row's diameter is 8mm, diameter is 10～11 in the hole of 6mm, and the angle that discharge pipe exports 9 upper surfaces and surface level is 9.5 °, is made into complete air speed control device.Adopt wind speed tester, test out the wind speed of wind tube outlet 9, test result is as shown in table 2.
Table 1
Table 2
Change the centrifugal blower 1 among the embodiment 1, model and the Specifeca tion speeification of centrifugal blower see Table 3, and all the other configurations are constant.Adopt simultaneously wind speed tester, test out the wind speed of wind tube outlet 9, the wind speed test result of air speed control device sees Table 4.
Table 3
Table 4
Relatively discovery by wind speed under above embodiment 1 and embodiment 2 dual modes, the different model fan blower has certain impact to wind speed, wherein the impact of flow and total head in the highest flight, therefore can be according to the needs of oneself in actual application, select the fan blower of different model, obtain needed wind speed.
Changing the angle that discharge pipe among the embodiment 2 exports 9 upper surfaces and surface level is 10.5 °, and other configuration is constant.Adopt simultaneously wind speed tester, test out the wind speed of wind tube outlet 9, the wind speed test result of air speed control device sees Table 5.
Table 5
By the relatively discovery of wind speed under above embodiment 2 and embodiment 3 dual modes, discharge pipe exports the change of 9 upper surfaces and lower surface angle, can change the size of wind speed, obtains needed wind speed.
With the air speed control device of making among the embodiment 3, be used for concrete plastic cracking performance evaluation, control the environment temperature of plastic cracking testing laboratory and the temperature of specimen surface well, carry out concrete plastic cracking test.Adopt simultaneously four desk fans come from identical producer and model to test, relatively the difference of itself and air speed control device.
Adopt the wind speed of the discharge pipe air outlet under fan and the air speed control device dual mode to see Table 6, fan and air speed control device to concrete formation after 4 hours moisture rate of evaporation and the plastic cracking area plastic cracking area that sees Table sample under 7, two kinds of wind regimes see Table 8.
Table 6
Table 7
Table 8
As can be seen from Table 6, compare with fan, air speed control device has improved stability and the homogeneity of wind speed greatly.
Can find out from table 7 and table 8, compare with fan, adopt air speed control device, single air outlet wind speed Size Error is less than 4%, each air outlet wind speed size deviation is less than 6%, and the surface moisture rate of evaporation of the concrete of same proportioning under four positions reaches unanimity, and the plastic cracking area reaches unanimity, realize the effective control to wind speed, improved accuracy and the repeatability of test findings.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. one kind is used for the air speed control device that the concrete plastic cracking is tested, comprise wind regime, it is characterized in that, described wind regime is connected with and makes the mixed uniformly return of wind, described return is provided with the return air outlet more than 1, described return air outlet is provided with some air outlet openings arranged in a uniform, is connected with discharge pipe (6) on the described return air outlet;
Described discharge pipe (6) be shaped as Z-type, the length of discharge pipe (6) is 400～500mm, width is 100～120mm, what described discharge pipe (6) adopted is that plank or iron plate process;
Described discharge pipe (6) is provided with the discharge pipe outlet (9) that is shaped as Duckbill type, and described discharge pipe outlet (9) lower surface is parallel with surface level;
The angle of described discharge pipe outlet (9) upper surface and surface level is 5～15 °.
2. the air speed control device for concrete plastic cracking test according to claim 1 is characterized in that, described return comprises pipeline, the threeway (3) that is connected with wind regime and the elbow (5) that pipeline is connected into the loop.
3. the air speed control device for the test of concrete plastic cracking according to claim 2 is characterized in that described pipeline is pvc pipe (4), and described PCV pipe (4) nominal outside diameter is 100～150mm.
4. the air speed control device for the test of concrete plastic cracking according to claim 2 is characterized in that described wind regime is connected by hemispherical dome joint (2) with threeway (3).
5. according to claim 1 to the described air speed control device for the test of concrete plastic cracking of 4 any one, it is characterized in that described wind regime is centrifugal blower (1).
6. according to claim 1 to the described air speed control device for the test of concrete plastic cracking of 4 any one, it is characterized in that, described air outlet opening is provided with 2～6 rows, it is 8～10mm that every row is provided with diameter, number is that 5～15 large air outlet opening (8) and diameter is 4～6mm, and number is 5～15 little air outlet opening (7).
7. the air speed control device for the test of concrete plastic cracking according to claim 6 is characterized in that, described large air outlet opening (8) is spaced with little air outlet opening (7).
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| CN 201010286434 CN101986137B (en) | 2010-09-19 | 2010-09-19 | Air speed control device used in plastic cracking test of concrete |
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| CN 201010286434 CN101986137B (en) | 2010-09-19 | 2010-09-19 | Air speed control device used in plastic cracking test of concrete |
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| CN101986137B true CN101986137B (en) | 2013-03-13 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455860A (en) * | 2000-09-15 | 2003-11-12 | Q试板实验室产品公司 | Multiple-blower relative humidity controlled test chamber |
| CN2722233Y (en) * | 2004-08-18 | 2005-08-31 | 顺光股份有限公司 | Heat-proof tester |
| CN101449108A (en) * | 2006-05-22 | 2009-06-03 | 空中客车德国有限公司 | Phytotron and method for controlling the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5917135A (en) * | 1982-07-20 | 1984-01-28 | Nippon Saamic:Kk | Temperature and humidity testing device |
| JPH05281098A (en) * | 1992-04-03 | 1993-10-29 | Honda Motor Co Ltd | High temperature environment testing apparatus |
| CN2482010Y (en) * | 2001-05-22 | 2002-03-13 | 成云广 | Health solar air conditioning room |
| CN201153658Y (en) * | 2008-01-14 | 2008-11-26 | 台州劲霸健康科技有限公司 | Electric drier double-duct air nozzle |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1455860A (en) * | 2000-09-15 | 2003-11-12 | Q试板实验室产品公司 | Multiple-blower relative humidity controlled test chamber |
| CN2722233Y (en) * | 2004-08-18 | 2005-08-31 | 顺光股份有限公司 | Heat-proof tester |
| CN101449108A (en) * | 2006-05-22 | 2009-06-03 | 空中客车德国有限公司 | Phytotron and method for controlling the same |
Non-Patent Citations (2)
| Title |
|---|
| JP昭59-17135A 1984.01.28 |
| JP特开平5-281098A 1993.10.29 |
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Address after: 210008 No. 12, Beijing West Road, Gulou District, Nanjing City, Jiangsu Province Patentee after: Jiangsu Subute New Materials Co., Ltd. Address before: No. 59, Wan An West Road, Jiangning District, Nanjing, Jiangsu Patentee before: Jiangsu Subute New Materials Co., Ltd. |