CN102590061A - 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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- CN102590061A CN102590061A CN2012100189940A CN201210018994A CN102590061A CN 102590061 A CN102590061 A CN 102590061A CN 2012100189940 A CN2012100189940 A CN 2012100189940A CN 201210018994 A CN201210018994 A CN 201210018994A CN 102590061 A CN102590061 A CN 102590061A
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- 239000004567 concrete Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000035699 permeability Effects 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000011156 evaluation Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 6
- 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
- 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
- -1 and it is meant Substances 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
- 238000007654 immersion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 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
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect 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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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 estimating concrete permeability.
Background technology
Perviousness is an overall target in concrete, and it is meant, and gas, liquid or ion are stressed, chemical potential or effect of electric field, the complexity of infiltration in concrete, diffusion or migration.Concrete perviousness and concrete durability are closely related, are to estimate one of most important index of concrete quality.Impervious good concrete can be resisted the influence of all external etching mediums, improves concrete permanance greatly.Originally test method at China's concrete permeability mainly is 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 chlorion electric flux method (ASTM C1202), quick chlorion transport coefficient method (RCM method) and full salt concrete electrical conductivity method electrical parameter evaluation methods such as (NEL methods).Permeable method operating equipment is complicated, and test specimen needs sealing, complex operation, and test period is longer, can only use the 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 prone to cause electrode heating because the test duration is longer, in addition the electrical parameter evaluation method for steel fiber reinforced concrete, be mixed with the salt additive concrete all inapplicable, its scope of application receives certain limitation.Therefore, contrast test and the infiltrative evaluation of concrete on construction site for concrete permeability in enormous quantities need design a kind of simple measurement mechanism and evaluation method quick, applied widely.
Summary of the invention
The device and method that the purpose of this invention is to provide a kind of simple and easy quick evaluation concrete permeability is to solve device complicacy, detection method complicated operation and the limited problem of range of application of present detection concrete permeability.
The present invention solves the problems of the technologies described above the technical scheme of taking to be: the device scheme: said device comprises micro-wave oven and rotating disk; Bottom in the micro-wave oven is provided with rotating disk, and said device also comprises cylindrical box body, lid and the steel plate that water is housed, and cylindrical concrete test block is located on the rotating disk; Cylindrical concrete test block is provided with cylindrical hole vertically; The cylindrical box body that water is housed is located in the cylindrical hole, and the cylindrical box body top that water is housed is provided with lid, is provided with steel plate in the micro-wave oven; Steel plate is provided with oblong openings, and 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, at first after filling water in the cylindrical box body, put into cylindrical hole; Then cylindrical concrete test block is placed on and carries out the heating first time on the rotating disk of micro-wave oven; Cylindrical concrete test block is taken out in the heating back, measures the temperature T of water in the cylindrical box body that water is housed immediately
1, choosing of heating power and heat time heating time will be guaranteed T
1≤80 ℃;
Step 3, take out cylindrical concrete test block after, make cylindrical concrete test block reach the surface drying state, cylindrical concrete test block is placed on the rotating disk of micro-wave oven and carries out heating second time, heating power all heats identical with the first time with heat time heating time;
The temperature T that cylindrical concrete test block is measured water in the cylindrical box body is taken out in step 4, heating back
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 estimated with the ratio of Q/t.
The present invention has following beneficial effect: 1, apparatus of the present invention are simple in structure, only need to improve on the used in daily life micro-wave oven; Conveniently be easy to get, cost is low.2, evaluation method of the present invention only needs the monitoring concrete sample to soak variation and the soak time that front and back cause water temperature in the 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, and the electric flux method needs 6 hours at present, and the hydrostatic(al) process time is indefinite; Especially the high-strength concrete test period is very long; Consider that again these methods require the pretreatment time of concrete sample,, need 24 hours at least like oven dry, the full water of vacuum etc.Dry to constant weight and the present invention considers microwave heating, shorten the test period greatly once more, simple to operate.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Embodiment
Embodiment one: combine Fig. 1 that this embodiment is described, the device of this embodiment comprises micro-wave oven 5 and rotating disk 6, and the bottom in the micro-wave oven 5 is provided with rotating disk 6; Said device also comprises cylindrical box body 2, lid 4 and the steel plate 7 that water is housed; Cylindrical concrete test block 1 is located on the rotating disk 6, and cylindrical concrete test block 1 is provided with cylindrical hole 1-1 vertically, and the cylindrical box body 2 that water is housed is located in the cylindrical hole 1-1; Cylindrical box body 2 tops that water is housed are provided with lid 4; Be provided with steel plate 7 in the micro-wave oven 5, steel plate 7 is provided with oblong openings 8, and the height of oblong openings 8 is consistent with the height of cylindrical concrete test block 1.
Embodiment two: the method for this embodiment may further comprise the steps: step 1, at first after filling water in the cylindrical box body 2, put into cylindrical hole 1-1; Then cylindrical concrete test block 1 is placed on and carries out the heating first time on the rotating disk 6 of micro-wave oven 5; Cylindrical concrete test block 1 is taken out in the heating back, measures the temperature T of water in the cylindrical box body 2 that water is housed immediately
1, choosing of heating power and heat time heating time will be guaranteed T
1≤80 ℃;
Behind step 2, the cylindrical concrete test block 1 of taking-up; After treating that temperature is reduced to room temperature, wherein the temperature of room temperature is 18-25 degree centigrade, and the container that cylindrical concrete test block 1 is put into filled with water soaks; Soak time is t, and t confirms based on concrete kind;
Step 3, take out cylindrical concrete test block 1 after, make cylindrical concrete test block reach the surface drying state, cylindrical concrete test block 1 is placed on the rotating disk 6 of micro-wave oven 5 and carries out heating second time, heating power all heats identical with the first time with heat time heating time;
The temperature T that cylindrical concrete test block 1 is measured water in the cylindrical box body 2 is taken out in step 4, heating back
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 estimated with the ratio of Q/t.
Above-mentioned steps is under the situation of not considering concrete sample initial aqueous rate, and the sample that promptly from various concrete actual conditions, takes out carries out above-mentioned evaluation, can analyze as the comparative evaluation of zones of different, position concrete permeability in the actual engineering.In addition; If will consider that concrete sample has identical benchmark; Remove the influence of concrete sample initial aqueous rate, the conventional way in laboratory be with concrete sample 105 ℃ of drying in oven 24 hours to constant weight, take among the present invention with concrete sample be placed on select for use in the micro-wave oven oven dry of low-power shelves to constant weight; Continue the test of repeating step one to step 4 then, utilize microwave heating method to shorten the drying time of concrete sample greatly.
Embodiment three: heating power is 750W-1500W in the step 1 of this embodiment, and be 45 seconds-180 seconds heat time heating time, and this power is the micro-wave oven normal power, and operating routine is simple and easy, and choose according to concrete kind heat time heating time.Other step is identical with embodiment two.
Embodiment four: the time that cylindrical concrete test block 1 soaks in the step 2 in the step 2 of this embodiment 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, and height is 80mm, and center-hole diameter is 50mm; The plastic cylinder shape box body 2 of packing in the center pit, the box external diameter is 50mm, 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.Inject the 100ml water in the plastic cylinder shape box body 2, 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 the function of power adjustments, the demonstration of power numeral, setting heat time heating time, and regulating the micro-wave oven output power is 1000W, and the microwave of micro-wave oven 5 emissions is through the rectangle window 8 of steel plate 7; Radially penetrate on cylindrical concrete test block 1, be 120 seconds heat time heating time, and cylindrical concrete test block 1 is taken out in the heating back; Open the lid 4 measure water in the cylindrical box bodies 2 temperature, cylindrical concrete test block 1 immersed is equipped with in the container of water, soaks the cylindrical concrete test block 1 of taking-up after 2 hours; Wiping its surface moisture with wet cloth makes it to the surface drying state; Once more cylindrical concrete test block 1 is put on the rotating disk 6 of micro-wave oven 5, heated once more with 5 pairs of cylindrical concrete test blocks 1 of micro-wave oven, heat time heating time is identical with the first time with heating power; Cylindrical concrete test block 1 is taken out in the heating back; Measure the temperature in the plastic cylinder shape box body 2 once more, utilize the secondary temperature difference to calculate and soak the heat that the back concrete absorbs, the ratio of Q/t can be used as the index of evaluation concrete permeability.
Hydrone is a polar molecule.When microwave passed through water, water had the ability that absorbs microwave energy more by force.Concrete includes the how much relevant through the numerical value that the concrete microwave intensity reduces with microwave of moisture.Heat for the first time cylindrical concrete test block, coolant-temperature gage rises in the plastic cylinder shape box body 2, the cylindrical concrete test block 1 of microwave through not soaking, and cylindrical concrete test block 1 has absorbed the energy of part microwave, and its numerical value is relevant with 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, because moisture in the cylindrical concrete test block 1, test block has absorbed more microwave energy; Microwave intensity reduces; Water intensification amplitude in the plastic cylinder shape box body 2 is little, and the temperature difference after twice heating of water in the plastic cylinder shape box body 2 is infiltrated the how much relevant of moisture with concrete test block, and the ratio that obtains Q/t in the method can be used as the index of estimating concrete permeability.
Xoncrete structure is loose porous, and perviousness is high, and the water that gets into inside concrete during immersion is just many, and the calorie value that concrete absorbs during heating is just big, and the ratio of this Q/t is big more under the same test conditions, and concrete perviousness is high more.
Claims (4)
1. the device of a simple and easy quick evaluation concrete permeability; Said device comprises micro-wave oven (5) and rotating disk (6); Bottom in the micro-wave oven (5) is provided with rotating disk (6), it is characterized in that said device also comprises cylindrical box body (2), lid (4) and the steel plate (7) that water is housed, and cylindrical concrete test block (1) is located on the 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 the cylindrical hole (1-1), and cylindrical box body (2) top that water is housed is provided with lid (4), is provided with steel plate (7) in the micro-wave oven (5); Steel plate (7) is provided with oblong openings (8), and the height of oblong openings (8) is consistent with the height of cylindrical concrete test block (1).
2. method that adopts the simple and easy quick evaluation concrete permeability of the said device of claim 1; It is characterized in that said method comprising the steps of: step 1, at first after filling water in the cylindrical box body (2), put into cylindrical hole (1-1); Then cylindrical concrete test block (1) is placed on and carries out the heating first time on the rotating disk (6) of micro-wave oven (5); Cylindrical concrete test block (1) is taken out in the heating back, measures the temperature T of the interior water of cylindrical box body (2) that water is housed immediately
1, choosing of heating power and heat time heating time will be guaranteed T
1≤80 ℃;
Step 2, take out cylindrical concrete test block (1) after, treat that temperature is reduced to room temperature after, the container of cylindrical concrete test block (1) being put into filled with water soaks, soak time is t;
Step 3, take out cylindrical concrete test block (1) after; Make cylindrical concrete test block reach the surface drying state; Cylindrical concrete test block (1) is placed on and carries out the heating second time on the rotating disk (6) of micro-wave oven (5), and heating power all heats identical with the first time with heat time heating time;
The temperature T that cylindrical concrete test block (1) is measured the interior water of cylindrical box body (2) is taken out in step 4, heating back
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 estimated with the ratio of Q/t.
According to the said simple and easy quick evaluation concrete permeability of claim 4 method, it is characterized in that heating power is 750W-1500W in the step 1, be 45 seconds-180 seconds heat time heating time.
According to the said simple and easy quick evaluation concrete permeability of claim 5 method, it is characterized in that the time that cylindrical concrete test block (1) in the step 2 soaks is 2-24 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210018994.0A CN102590061B (en) | 2012-01-20 | 2012-01-20 | Device and method for evaluating concrete permeability simply and quickly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210018994.0A CN102590061B (en) | 2012-01-20 | 2012-01-20 | Device and method for evaluating concrete permeability simply and quickly |
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| CN102590061A true CN102590061A (en) | 2012-07-18 |
| CN102590061B CN102590061B (en) | 2014-08-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884633A (en) * | 2014-03-05 | 2014-06-25 | 中国石油天然气股份有限公司 | Method and device for determining rock permeability |
| CN108613914A (en) * | 2018-06-19 | 2018-10-02 | 哈尔滨工业大学 | A kind of multidirectional seepage flow test device of the asphalt of constant head |
| CN110501274A (en) * | 2019-08-28 | 2019-11-26 | 重庆大学 | A kind of test reinforcing bar-concrete interface chloride ion permeability device and the test method based on the device |
| CN111982772A (en) * | 2020-08-05 | 2020-11-24 | 东北大学 | Resistivity imaging-based coal rock humidity diffusion identification test device and method |
| CN114689827A (en) * | 2022-02-28 | 2022-07-01 | 北京建筑材料检验研究院有限公司 | Method for testing self-healing performance of self-repairing concrete crack |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884633A (en) * | 2014-03-05 | 2014-06-25 | 中国石油天然气股份有限公司 | Method and device for determining rock permeability |
| CN103884633B (en) * | 2014-03-05 | 2016-05-11 | 中国石油天然气股份有限公司 | Method and device for determining rock permeability |
| CN108613914A (en) * | 2018-06-19 | 2018-10-02 | 哈尔滨工业大学 | A kind of multidirectional seepage flow test device of the asphalt of constant head |
| CN110501274A (en) * | 2019-08-28 | 2019-11-26 | 重庆大学 | A kind of test reinforcing bar-concrete interface chloride ion permeability device and the test method based on the 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 |
| CN111982772A (en) * | 2020-08-05 | 2020-11-24 | 东北大学 | Resistivity imaging-based coal rock humidity diffusion identification test device and method |
| CN111982772B (en) * | 2020-08-05 | 2021-09-24 | 东北大学 | Resistivity imaging-based coal rock humidity diffusion identification test device and method |
| CN114689827A (en) * | 2022-02-28 | 2022-07-01 | 北京建筑材料检验研究院有限公司 | Method for testing self-healing performance of self-repairing concrete crack |
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| CN102590061B (en) | 2014-08-06 |
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