CN1415825A - Eletroosmosis technique for concrete - Google Patents
Eletroosmosis technique for concrete Download PDFInfo
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- CN1415825A CN1415825A CN 02144927 CN02144927A CN1415825A CN 1415825 A CN1415825 A CN 1415825A CN 02144927 CN02144927 CN 02144927 CN 02144927 A CN02144927 A CN 02144927A CN 1415825 A CN1415825 A CN 1415825A
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- 239000004567 concrete Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title description 8
- 238000005516 engineering process Methods 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 5
- 238000010276 construction Methods 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000003595 mist Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 230000036571 hydration Effects 0.000 abstract 2
- 238000006703 hydration reaction Methods 0.000 abstract 2
- 239000011083 cement mortar Substances 0.000 abstract 1
- 239000012779 reinforcing material Substances 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 description 14
- 238000011161 development Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 238000011026 diafiltration Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000011377 vacuum concrete Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A concrete electrophoretic technology characterizes in using double layer generated from concrete hydration or conductive performance of conductive micropowder and conductive fiber mixed in cement mortar to take originally arranged reinforcing material as steel bar or steel tube as cathode or take the inserted conductive outlet tube or outlet mesh as the anode and drain pipe to apply DC voltage to form electric-osmosis expelled from anode and excess water is extracted. Electrophoretic technology makes excess water of concrete hydration to gather to the anode and extracted time to reduce the water-cement ratio obviously.
Description
Technical field
The invention belongs to building hydraulic engineering technical field.Relate to concrete technology, specially refer to concrete electric osmose construction technology.
Background technology
Along with the development of concrete construction technology, Cracking of High Flowing Concrete is more and more used.The approach that realizes concrete good workability has two: a kind of is to add Admixture; Another is to improve construction technology, does not adopt Admixture only to realize concrete good workability with big water/binder ratio, does not add Admixture.The former is called chutable concrete, and the latter is called big water/binder ratio concrete.
Chutable concrete is the concrete that replaces the half-dried rigid concrete function admirable of dry.Chutable concrete has cement consumption on the one hand and water consumption is more, and the workability of the Cracking of High Flowing Concrete of the about 20cm of slump is convenient to pumping, transportation and cast; Can obtain being similar to the quality of the wet concrete of slump 5cm-10cm on the other hand again.Both satisfy construction requirement, improved quality of concrete again.It mainly is to reach concrete large fluidity by mixing high efficiency water reducing agent.Concrete development has been represented in the development of Admixture.Along with the development of efficient additive, the performance of chutable concrete is constantly perfect in recent years.Admixture is considered to concrete the 5th component after cement, water, sand and stone.China has formulated the standard GB8076 of corresponding Admixture.
Chutable concrete has its absolute advantage performance as current most popular a kind of concrete kind, but also exist some unsurmountable shortcomings: 1) Admixture consumes a large amount of resources and the energy in process of production, and produce a large amount of poisonous waste water,waste gas and industrial residue, contaminated environment in process of production as organic compound; 2) Admixture is the problem of research of deepening continuously at present to concrete negative effect, and the mixing of Admixture causes concrete pollution probably and influence concrete long-term work, such as causing concrete cracking or alkali-aggregate reaction; 3) contain hazardous substances such as formaldehyde in most of Admixture, long-term use may be polluted indoor environment, threatens human health; 4) along with the improvement of Admixture performance, price is also improving constantly, and the use of Admixture has increased substantially concrete cost.
Big water/binder ratio concrete does not adopt any Admixture, only depends on big water/binder ratio to realize the purpose of large fluidity.But must be at its forward part eliminating construction mixing water wherein that condenses in order to satisfy durability requirement.The job practices that realizes this purpose at present has two kinds:
1. lay wire concrete construction technology
Since French Du Lang Mr. and Mrs had invented architectural lay wire, the lay wire technology was more and more used in body of wall.Architectural lay wire is that steel plate is drawn into the expanded metal lath that filled aperature is the similar snakeskin mesh of 7.5 * 9.5mm, makes three-dimensional space net rack in factory, transports assembled on site and fluid concrete to, constitutes the lay wire concrete.The diafiltration effect of snakeskin mesh can be drained the unnecessary mixing water in the construction rapidly by the snakeskin hole, concrete is reduced water/binder ratio at casting process.The concrete that expanded metal lath constitutes is owing to the diafiltration effect of itself, and the hoop effect can significantly improve mechanical properties of concrete, as compressive strength and anti-seismic performance, and realizes big water/binder ratio construction, without vibration and self-compaction.
2. vacuum concrete construction technology
The vacuum operation method is by means of negative pressure of vacuum, and water is discharged from the concrete mix of firm moulding, makes a kind of forming method of concrete compaction simultaneously.Nineteen thirty-five, the Billner of the U.S. obtained vacuum concrete construction method technical patent.After, the U.S., states such as the West Europe and the former Soviet Union just are used for concrete prefabricated and cast-in-place engineering to this technology one after another.Nineteen eighty-two, the air-cushion film vacuum mat was invented by China, can be applicable to the rigid pavement, the vacuum dehydration on large area concrete surfaces such as airfield runway construction, and it has vacuum and is evenly distributed, dewatering efficiency height, advantage such as the pressure that concrete is produced is big.
But they also have unsurmountable shortcoming: be limited to the development of lay wire technology, it can only use as materials for wall, can't give full play to advantage in other respects.Vacuum technique has obtained very big development in recent years, but because its construction is complicated, apparatus expensive is so also just use in the engineering that concrete quality is more among a small circle had relatively high expectations.
In sum, in the modern concrete technology, big water/binder ratio concrete is concrete developing direction, and problem demanding prompt solution is, innovation constantly perfect to its construction technology and development now
Summary of the invention
The purpose of this invention is to provide a kind of electric conductivity that utilizes conductive doped micro mist, conductive fiber etc. in electric double layer that hydrated cementitious produces or the cement paste, utilize electric osmosis principle, the excessive moisture anode of hydrated cementitious is assembled, and in time extract, so that concrete water/binder ratio obviously reduces, solved the contradictory problems between the big water/binder ratio of construction requirement in the concrete work and the little water/binder ratio that functional performance requires.Solved Admixture simultaneously and brought pollution problems to concrete.
Technical solution of the present invention is: utilize the electric conductivity of conductive doped micro mist, conductive fiber etc. in electric double layer that hydrated cementitious produces or the cement paste, make and form EOF the alive outside effect of concrete under, from anode eliminating excessive moisture.The reinforcement material that in the construction script in the concrete is disposed such as reinforcing bar, steel pipe or steel mesh are as negative electrode, and the conductive hole pipe of Zhi Ruing is as anode and drainage channel simultaneously.The size of voltage is by interelectrode distance and the condensate water gray scale decision that will realize.Wherein concrete filled steel tube is directly got steel pipe as negative electrode; Concrete column or beam are got the reinforcing bar of former configuration or stirrup as negative electrode; Concrete wall can be directly with former arrangement of reinforcement as negative electrode and anode.The conductive hole pipe can be steel pipe with holes, copper pipe, aluminum pipe or by material such as inorganic and organic conductive fiber, conductive particle, conductive whiskers.
Effect of the present invention and benefit are to have realized concrete good workability in concrete construction under the situation of not using any Admixture, reach the purpose of " big water/binder ratio construction, little water/binder ratio condenses ".And easy construction can obtain free of contamination high performance concrete again, is a kind of brand-new green concrete ten thousand methods of constructing.
Description of drawings
Fig. 1 is a concrete filled steel tube electric osmose construction technology schematic diagram of the present invention.
Among the figure: (a) lateral view, (b) vertical view.
(1) steel pipe, (2) concrete, (3) anode conducting hole pipe, (4) power supply.
Fig. 2 is concrete beam of the present invention or concrete column electric osmose construction technology schematic diagram.
Among the figure: (2) concrete, (3) anode conducting hole pipe, (5) concrete beam or post arrangement of reinforcement, (6) stirrup.
Fig. 3 is a concrete wall electric osmose construction technology schematic diagram of the present invention.
Among the figure: (7) perforated metal template, (8) common metal template.
The specific embodiment
Be described in detail concrete construction sequence of the present invention and most preferred embodiment below in conjunction with accompanying drawing.
Concrete construction sequence
Step 1: determine concrete proportioning by designing requirement, it is definite that water/binder ratio is wherein pressed construction requirement, calculates concrete condensate water gray scale by requirement of strength simultaneously.
Step 2: press Anode-cathode Distance and condensate water gray scale size and determine construction voltage.
Step 3: by common job practices formwork erection, arrangement of reinforcement, pre-buried orificed anode in the arrangement of reinforcement process.
Step 4: provide DC voltage by dc source.
Step 5: the water that will converge at anode in the galvanization is discharged, until the condensate water gray scale that reaches designing requirement.
Most preferred embodiment:
The construction of concrete filled steel tube
Step 1: raw material is selected: outer pipe diameter 300mm; Conductive hole bore 30mm, tube wall belt hole, bore dia 10mm is blossom type row; 42.5 portland cement, river sand, rubble D
M=20mm, tap water; This routine concrete proportioning is C: S: G: W=309: 631: 1473: 170, and water/binder ratio 0.55, design condensate water gray scale is 0.45.
Step 2: arrange steel pipe (1) and built-in conductive hole pipe (3).Conductive hole pipe (3) is used the nonwoven parcel before laying, avoid mortar to flow out.
Step 3: fluid concrete (2).Nonwoven impacted when avoiding fluid concrete and peel off, reply is towards outer steel pipe (1) inwall during cast.
Step 4: apply dc source 20V.Water constantly to center conductive hole manifold collection, is in time got rid of moisture.
After step 5:45-70 minute, stop energising.The later same ordinary concrete of maintenance.
Claims (1)
1. concrete electric osmose construction technology, it is characterized in that, utilize the electric conductivity of conductive doped micro mist, conductive fiber etc. in electric double layer that hydrated cementitious produces or the cement paste, with in the concrete originally the reinforcement material of configuration such as reinforcing bar, steel pipe or steel mesh as negative electrode (1), (5) or (8), conductive hole pipe (3) of Zhi Ruing or hole pattern (7) are as anode and drainage channel simultaneously, it is applied DC voltage, form EOF, get rid of and the extraction excessive moisture from anode simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021449279A CN1189635C (en) | 2002-12-14 | 2002-12-14 | Eletroosmosis technique for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021449279A CN1189635C (en) | 2002-12-14 | 2002-12-14 | Eletroosmosis technique for concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1415825A true CN1415825A (en) | 2003-05-07 |
| CN1189635C CN1189635C (en) | 2005-02-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021449279A Expired - Fee Related CN1189635C (en) | 2002-12-14 | 2002-12-14 | Eletroosmosis technique for concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1189635C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061780B (en) * | 2009-09-11 | 2012-05-30 | 虞建放 | Steel plate concrete column and construction method |
| CN108275948A (en) * | 2018-03-07 | 2018-07-13 | 广州大学 | A kind of conduction concrete filled steel tube and preparation method thereof |
| CN110565958A (en) * | 2019-09-24 | 2019-12-13 | 上海市水利工程集团有限公司 | Vacuum pumping, draining and clearing internal bleeding of mass concrete and structure anti-cracking method |
| US11492297B2 (en) * | 2019-06-03 | 2022-11-08 | National Taiwan University Of Science And Technology | Cement-based cementitious material and its formation method |
| CN115521163A (en) * | 2022-09-27 | 2022-12-27 | 中建八局第四建设有限公司 | Method and device for removing free water in cement concrete |
-
2002
- 2002-12-14 CN CNB021449279A patent/CN1189635C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061780B (en) * | 2009-09-11 | 2012-05-30 | 虞建放 | Steel plate concrete column and construction method |
| CN108275948A (en) * | 2018-03-07 | 2018-07-13 | 广州大学 | A kind of conduction concrete filled steel tube and preparation method thereof |
| US11492297B2 (en) * | 2019-06-03 | 2022-11-08 | National Taiwan University Of Science And Technology | Cement-based cementitious material and its formation method |
| CN110565958A (en) * | 2019-09-24 | 2019-12-13 | 上海市水利工程集团有限公司 | Vacuum pumping, draining and clearing internal bleeding of mass concrete and structure anti-cracking method |
| CN110565958B (en) * | 2019-09-24 | 2023-09-05 | 上海市水利工程集团有限公司 | Method for removing bleeding in large-volume concrete by vacuum pumping and discharging and preventing structural cracking |
| CN115521163A (en) * | 2022-09-27 | 2022-12-27 | 中建八局第四建设有限公司 | Method and device for removing free water in cement concrete |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1189635C (en) | 2005-02-16 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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Granted publication date: 20050216 Termination date: 20111214 |