CN102590061B - Device and method for evaluating concrete permeability simply and quickly - Google Patents
Device and method for evaluating concrete permeability simply and quickly Download PDFInfo
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- CN102590061B CN102590061B CN201210018994.0A CN201210018994A CN102590061B CN 102590061 B CN102590061 B CN 102590061B CN 201210018994 A CN201210018994 A CN 201210018994A CN 102590061 B CN102590061 B CN 102590061B
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- 239000004567 concrete Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000035699 permeability Effects 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 238000011156 evaluation Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000002791 soaking Methods 0.000 abstract description 3
- 241000370738 Chlorion Species 0.000 description 3
- 238000007716 flux method Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a device and a method for evaluating concrete permeability simply and quickly, and relates to a device and a method for evaluating concrete permeability. The invention aims to solve the problems that the conventional device for detecting the concrete permeability is complicated, the conventional detection method is complicated to operate and the application range is limited. The device adopts the scheme that a cylindrical concrete test block is arranged on a turnplate; a cylindrical box body with water is arranged in a cylindrical through hole; a box cover is arranged on the top of the cylindrical box body with water; a steel plate is arranged in a microwave oven; and a rectangular opening is formed on the steel plate. The method comprises the following steps of: placing the cylindrical concrete test block on the turnplate of the microwave oven and heating for the first time; placing the cylindrical concrete test block into a container filled with water and soaking, wherein the soaking time is t; placing the cylindrical concrete test block on the turnplate of the microwave oven and heating for the second time; calculating the difference value Q of heat absorbed by the cylindrical concrete test block after heating for two times; and evaluating the concrete permeability by the Q/t ratio. The device and the method are used for detecting the concrete permeability.
Description
Technical field
The present invention relates to a kind of device and method of evaluating concrete permeability.
Background technology
In concrete, perviousness is an overall target, and it refers to, and gas, liquid or ion are stressed, the effect of chemical potential or electric field, the complexity of infiltration in concrete, diffusion or migration.Concrete perviousness and concrete durability are closely related, are to evaluate one of most important index of concrete quality.Impervious good concrete can be resisted the impact of all external etching mediums, greatly improves concrete permanance.Originally test method at China's concrete permeability is mainly permeable method, is highly characterized by anti-penetration grade, infiltration coefficient and infiltration.In recent years, the more and more evaluation high-strength high-performance concretes that are employed of electrical parameter evaluation method such as chlorion electric flux method (ASTM C1202), fast chlorion transport coefficient method (RCM method) and full salt concrete electrical conductivity method (NEL method).Permeable method operating equipment is more complicated, and test specimen needs sealing, complex operation, and test period is longer, can only use permeated height evaluation to high-strength high-performance concrete, but the measured value of permeated height is difficult for accurately.And chlorion electric flux method is because the test duration is longer, easily cause electrode heating, in addition electrical parameter evaluation method for steel fiber reinforced concrete, be mixed with salt additive concrete all inapplicable, its scope of application is subject to certain limitation.Therefore, need to design a kind of simple measurement mechanism and evaluation method quick, applied widely for contrast test and the infiltrative evaluation of concrete on construction site of concrete permeability in enormous quantities.
Summary of the invention
The object of this invention is to provide a kind of simple and fast and evaluate the device and method of concrete permeability, to solve device complexity, detection method complicated operation and the limited problem of range of application of current detection concrete permeability.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: device scheme: described device comprises micro-wave oven and rotating disk, bottom in micro-wave oven is provided with rotating disk, described device also comprises the cylindrical box body that water is housed, lid and steel plate, cylindrical concrete test block is located on rotating disk, cylindrical concrete test block is provided with cylindrical hole vertically, the cylindrical box body that water is housed is located in cylindrical hole, the cylindrical box body top that water is housed is provided with lid, in micro-wave oven, be provided with steel plate, steel plate is provided with oblong openings, the height of oblong openings is consistent with the height of cylindrical concrete test block,
Method scheme: said method comprising the steps of: step 1, first will put into cylindrical hole after in-built cylindrical box body full water, then cylindrical concrete test block is placed on the rotating disk of micro-wave oven and heats for the first time, after heating, take out cylindrical concrete test block, measure immediately the temperature T of water in the cylindrical box body that water is housed
1, choosing of heating power and heat time will be guaranteed T
1≤ 80 DEG C;
Step 2, take out after cylindrical concrete test block, after temperature is down to room temperature, the container of cylindrical concrete test block being put into filled with water soaks, and soak time is t;
Step 3, take out after cylindrical concrete test block, make cylindrical concrete test block reach dry face state, cylindrical concrete test block is placed on the rotating disk of micro-wave oven and heats for the second time, heating power and heat time all with heat for the first time identical;
After step 4, heating, take out the temperature T of water in cylindrical concrete test block measurement cylindrical box body
2, calculate the heat difference that cylindrical concrete test block absorbs after twice heating, wherein Δ T=T according to heat Calculation formula Q=cm Δ T
2-T
1, concrete permeability is evaluated with the ratio of Q/t.
The present invention has following beneficial effect: 1, apparatus of the present invention are simple in structure, only needs to be improved on micro-wave oven used in daily life; Conveniently be easy to get, cost is low.2, evaluation method of the present invention, only needs monitoring concrete sample to soak variation and the soak time that front and back cause water temperature in special container, calculates Q/t and just can characterize concrete perviousness, and simple, test period only needs a few minutes.Compare with other evaluation method, test period shortens greatly, electric flux method needs 6 hours at present, the hydrostatic(al) process time is indefinite, especially high-strength concrete test period is very long, consider that again these methods require the pretreatment time of concrete sample, as oven dry, the full water of vacuum etc., at least need 24 hours.Dry to constant weight and the present invention considers microwave heating, again greatly shorten the test period, simple to operate.
Brief description of the drawings
Fig. 1 is one-piece construction schematic diagram of the present invention.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1, the device of present embodiment comprises micro-wave oven 5 and rotating disk 6, bottom in micro-wave oven 5 is provided with rotating disk 6, described device also comprises the cylindrical box body 2 that water is housed, lid 4 and steel plate 7, cylindrical concrete test block 1 is located on rotating disk 6, cylindrical concrete test block 1 is provided with cylindrical hole 1-1 vertically, the cylindrical box body 2 that water is housed is located in cylindrical hole 1-1, cylindrical box body 2 tops that water is housed are provided with lid 4, in micro-wave oven 5, be provided with steel plate 7, steel plate 7 is provided with oblong openings 8, the height of oblong openings 8 is consistent with the height of cylindrical concrete test block 1.
Embodiment two: the method for present embodiment comprises the following steps: step 1, first will put into cylindrical hole 1-1 after in-built cylindrical box body 2 full water, then cylindrical concrete test block 1 is placed on the rotating disk 6 of micro-wave oven 5 and heats for the first time, after heating, take out cylindrical concrete test block 1, measure immediately the temperature T of the cylindrical box body 2 interior water that water is housed
1, choosing of heating power and heat time will be guaranteed T
1≤ 80 DEG C;
Step 2, take out after cylindrical concrete test block 1, after temperature is down to room temperature, wherein the temperature of room temperature is 18-25 degree Celsius, and the container that cylindrical concrete test block 1 is put into filled with water soaks, soak time is t, and t determines according to concrete kind;
Step 3, take out after cylindrical concrete test block 1, make cylindrical concrete test block reach dry face state, cylindrical concrete test block 1 is placed on the rotating disk 6 of micro-wave oven 5 and heats for the second time, heating power and heat time all with heat for the first time identical;
After step 4, heating, the cylindrical concrete test block 1 of taking-up is measured the temperature T of cylindrical box body 2 interior water
2, calculate the heat difference that cylindrical concrete test block 1 absorbs after twice heating, wherein Δ T=T according to heat Calculation formula Q=cm Δ T
2-T
1, concrete permeability is evaluated with the ratio of Q/t.
Above-mentioned steps is in the situation that not considering concrete sample initial aqueous rate, and the sample taking out from various concrete actual conditions carries out above-mentioned evaluation, can analyze as the comparative evaluation of zones of different, position concrete permeability in Practical Project.In addition, if consider, concrete sample has identical benchmark, remove the impact of concrete sample initial aqueous rate, the way of laboratory routine be by concrete sample 105 DEG C of drying in oven 24 hours to constant weight, in the present invention, take by concrete sample be placed in micro-wave oven, select the oven dry of low-power shelves to constant weight, then continue the test of repeating step one to step 4, utilize microwave heating method greatly to shorten the drying time of concrete sample.
Embodiment three: in the step 1 of present embodiment, heating power is 750W-1500W, the heat time is 45 seconds-180 seconds, and this power is micro-wave oven normal power, and operating routine is simple and easy, and the heat time is chosen according to concrete kind.Other step is identical with embodiment two.
Embodiment four: the time that in the step 2 of present embodiment, in step 2, cylindrical concrete test block 1 soaks is 2-24 hour, and soak time is chosen according to concrete kind.Other step is identical with embodiment two or three.
Embodiment five: cylindrical concrete test block 1 diameter is 150mm, height is 80mm, center-hole diameter is 50mm, in center pit, pack plastic cylindrical box body 2 into, box external diameter is 50mm, and internal diameter is 44mm, height is 80mm, the height of rectangle window 8 is 80mm, and wide is 20mm, and the thickness of steel plate is 3mm.The interior injection of plastic cylindrical box body 2 100ml water, cover lid 4, cylindrical concrete test block 1 is put into the center on the rotating disk 6 of micro-wave oven 5, micro-wave oven 5 has power adjustments, power numeral shows, the function that heat time arranges, adjusting microwave oven output power is 1000W, the microwave that micro-wave oven 5 is launched is by the rectangle window 8 of steel plate 7, radially penetrate on cylindrical concrete test block 1, heat time is 120 seconds, after heating, take out cylindrical concrete test block 1, the temperature of 4 measurement cylindrical box body 2 interior water opens the lid, cylindrical concrete test block 1 is immersed and is equipped with in the container of water, soak and after 2 hours, take out cylindrical concrete test block 1, wiping its surface moisture with wet cloth makes it to dry face state, again cylindrical concrete test block 1 is put on the rotating disk 6 of micro-wave oven 5, cylindrical concrete test block 1 is heated again with micro-wave oven 5, heat time and heating power and identical for the first time, after heating, take out cylindrical concrete test block 1, again measure the temperature in plastic cylindrical box body 2, utilize secondary temperature difference to calculate and soak the heat that rear concrete absorbs, the ratio of Q/t be can be used as to the index of evaluating concrete permeability.
Hydrone is polar molecule.When microwave passes through water, water has the ability of stronger microwave energy absorbing.How many numerical value of reducing by concrete microwave intensity to microwave of moisture content are relevant in concrete.Heat for the first time cylindrical concrete test block, the interior coolant-temperature gage of plastic cylindrical box body 2 rises, and microwave is by the cylindrical concrete test block 1 not soaking, and cylindrical concrete test block 1 has absorbed the energy of part microwave, and its numerical value is relevant to concrete composition; Heat for the second time cylindrical concrete test block 1, microwave passes through the cylindrical concrete test block 1 of water leaking-in, due to moisture in cylindrical concrete test block 1, test block has absorbed more microwave energy, microwave intensity reduces, water increasing extent of temperature in plastic cylindrical box body 2 is little, the temperature difference after twice heating of water in plastic cylindrical box body 2 and concrete test block infiltrate moisture number relevant, the ratio that obtains Q/t in method can be used as the index of evaluation concrete permeability.
Xoncrete structure is loose porous, and perviousness is high, and the water that enters inside concrete when immersion is just many, and the calorie value that when heating, concrete absorbs is just large, and under same test conditions, the ratio of this Q/t is larger, and concrete perviousness is higher.
Claims (4)
1. the device of a simple and fast evaluation concrete permeability, described device comprises micro-wave oven (5) and rotating disk (6), bottom in micro-wave oven (5) is provided with rotating disk (6), it is characterized in that described device also comprises the cylindrical box body (2) that water is housed, lid (4) and steel plate (7), cylindrical concrete test block (1) is located on rotating disk (6), cylindrical concrete test block (1) is provided with cylindrical hole (1-1) vertically, the cylindrical box body (2) that water is housed is located in cylindrical hole (1-1), cylindrical box body (2) top that water is housed is provided with lid (4), in micro-wave oven (5), be provided with steel plate (7), steel plate (7) is provided with oblong openings (8), the height of oblong openings (8) is consistent with the height of cylindrical concrete test block (1), the microwave of micro-wave oven (5) transmitting is by the rectangle window (8) of steel plate (7), radially penetrate on cylindrical concrete test block (1).
2. the method for a simple and fast evaluation concrete permeability, it has adopted simple and fast claimed in claim 1 to evaluate the device of concrete permeability, it is characterized in that said method comprising the steps of: step 1, first will after the in-built full water of cylindrical box body (2), put into cylindrical hole (1-1), then cylindrical concrete test block (1) is placed on the rotating disk (6) of micro-wave oven (5) and heats for the first time, after heating, take out cylindrical concrete test block (1), measure immediately the temperature T of the interior water of cylindrical box body (2) that water is housed
1, choosing of heating power and heat time will be guaranteed T
1≤ 80 DEG C;
Step 2, take out after cylindrical concrete test block (1), after temperature is down to room temperature, the container of cylindrical concrete test block (1) being put into filled with water soaks, and soak time is t;
Step 3, take out after cylindrical concrete test block (1), make cylindrical concrete test block reach dry face state, cylindrical concrete test block (1) is placed on the rotating disk (6) of micro-wave oven (5) and heats for the second time, heating power and heat time all with heat for the first time identical;
After step 4, heating, take out the temperature T of the interior water of cylindrical concrete test block (1) measurement cylindrical box body (2)
2, calculate the heat difference that cylindrical concrete test block (1) absorbs after twice heating, wherein Δ T=T according to heat Calculation formula Q=cm Δ T
2-T
1, with the ratio of Q/t, concrete permeability to be evaluated, xoncrete structure is loose porous, perviousness is high, and the water that enters inside concrete when immersion is just many, and the calorie value that when heating, concrete absorbs is just large, under same test conditions, the ratio of this Q/t is larger, and concrete perviousness is higher.
3. simple and fast is evaluated the method for concrete permeability according to claim 2, it is characterized in that in step 1, heating power is 750W-1500W, and the heat time is 45 seconds-180 seconds.
4. evaluate the method for concrete permeability according to simple and fast described in claim 2 or 3, it is characterized in that the time that in step 2, cylindrical concrete test block (1) soaks is 2-24 hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210018994.0A CN102590061B (en) | 2012-01-20 | 2012-01-20 | Device and method for evaluating concrete permeability simply and quickly |
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|---|---|---|---|
| CN201210018994.0A CN102590061B (en) | 2012-01-20 | 2012-01-20 | Device and method for evaluating concrete permeability simply and quickly |
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| CN102590061B true CN102590061B (en) | 2014-08-06 |
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| CN103884633B (en) * | 2014-03-05 | 2016-05-11 | 中国石油天然气股份有限公司 | A kind of method of definite rock permeability and device |
| CN108613914B (en) * | 2018-06-19 | 2021-02-02 | 哈尔滨工业大学 | Constant head asphalt mixture multidirectional seepage testing device |
| CN110501274B (en) * | 2019-08-28 | 2022-02-11 | 重庆大学 | Device for testing permeability of chloride ions at reinforcing steel bar-concrete interface and testing method based on device |
| CN111982772B (en) * | 2020-08-05 | 2021-09-24 | 东北大学 | Resistivity imaging-based coal rock humidity diffusion identification test device and method |
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| US5844136A (en) * | 1996-01-24 | 1998-12-01 | Agip S.P.A. | Device for measuring the permeability of rock fragments |
| CN101074912A (en) * | 2007-06-06 | 2007-11-21 | 河海大学 | Apparatus and method for testing cement concrete penetration performance under loading action |
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| CN102183445A (en) * | 2011-03-07 | 2011-09-14 | 福建工程学院 | Instrument and method for testing permeability coefficient of water-permeable cement concrete |
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2012
- 2012-01-20 CN CN201210018994.0A patent/CN102590061B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| US5844136A (en) * | 1996-01-24 | 1998-12-01 | Agip S.P.A. | Device for measuring the permeability of rock fragments |
| CN101074912A (en) * | 2007-06-06 | 2007-11-21 | 河海大学 | Apparatus and method for testing cement concrete penetration performance under loading action |
| CN101442847A (en) * | 2008-12-17 | 2009-05-27 | 电子科技大学 | Directly-coupled cup-shaped microwave energy-feedback antenna and array microwave heating device thereof |
| CN101738363A (en) * | 2009-12-28 | 2010-06-16 | 上海嘉洁环保工程有限公司 | Instrument and method for testing permeability coefficient |
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| 苏安双等.混凝土渗透性测定方法比较与选择.《工业建筑》.2006,第36卷(第9期),57-61. |
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