CN1016977B - Electroconductive layer for cathod protected reinforced concrete constructure - Google Patents
Electroconductive layer for cathod protected reinforced concrete constructureInfo
- Publication number
- CN1016977B CN1016977B CN 88105421 CN88105421A CN1016977B CN 1016977 B CN1016977 B CN 1016977B CN 88105421 CN88105421 CN 88105421 CN 88105421 A CN88105421 A CN 88105421A CN 1016977 B CN1016977 B CN 1016977B
- Authority
- CN
- China
- Prior art keywords
- conductive layer
- slag
- alkali
- coke breeze
- reinforced concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Prevention Of Electric Corrosion (AREA)
Abstract
The present invention relates to a conductive layer for a reinforced concrete structure for cathodic protection. The material of the present invention which is the mixture of slag powder, an alkaline excitant and coke breeze forms a conductive layer on the surface of the reinforced concrete structure by the construction methods of mechanically spraying, sticking precast slab or artificially painting. The present invention has the advantages of high strength, low resistance, extensive material source, simple and convenient construction, etc., and the present invention can replace hot asphalt mortar or conducting polymer slurry to be coated on the construction surfaces required for cathodic protection, particularly bottom surfaces and side surfaces.
Description
The present invention relates to carry out a kind of conductive layer that impressed current cathodic protection is adopted, belong to anti-corrosion of metal being exposed to airborne reinforced concrete structure.
Reinforced concrete structure in the liquid or in the soil is carried out electrochemical cathodic protection; this method is well-known already; research to the cathodic protection that is exposed to airborne reinforced concrete structure; start from 1974, the U.S. and Canada once adopted two kinds of schemes to execute cathodic protection to reinforced concrete bridge deck is firm and hard.First kind of scheme is to spread out and put on one deck pitch coke breeze conductive layer at the bridge deck upper surface, flatten with road roller, silicon-iron block is wherein embedding as anode, because the resistivity of this layer mortar is about 25 Ω cm, therefore this conductive layer must have 5cm thick, could satisfy the low-resistance requirement of conductive layer.Because this layer mixture mortar strength is low, also will add the thick asphalt wearing layer of one deck 5cm above, could drive a vehicle.Second kind of scheme is to open ditch at the bridge deck upper surface one every 30cm, puts a rhizoid shape anode in the ditch, irritates with the conducting polymer slurry again.The document that reflects above prior art can be with reference to 1, R.F.stratfull, the experimental cathodic protection of bridge deck, Transportation Research Record No500,1974; 2, R.P.Brpwn, R.G.Powers, steel cathodic protection conductive material applicating present situation in the concrete, Corrosion ' 85, Paper Number 264, Pp8.Obviously, these two kinds of schemes are inapplicable to the bottom surface and the side of reinforced concrete structure, therefore, still adopt the traditional concrete of corrosion and destruction part, method of being repaired with shotcrete more of cutting now basically.And traditional method workload is big, and is uneconomical, and construction quality is difficult to guarantee.
Order of the present invention is at the deficiencies in the prior art, invents a kind of conductive layer that possesses high strength, low-resistivity simultaneously, can cover easily on the surface of the reinforced concrete structure that needs cathodic protection, particularly bottom surface or side.
We notice slag alkali cement when the material of research conductive layer, it has strong, the high series of advantages such as strong, high homogenieity, low porosity, low-shrinkage, high corrosion-resistant, high-wearing feature early of superelevation.The technical literature of reflection slag alkali cement has: в. Д. and Г л у х о в с к и й, щ л а к о щ e л о ч н ы e Ц e м e н т ы, Ц e м e н т, 1985, В ы п .3, Crp11～12.
Feature of the present invention is to adopt alkali lye activated slag powder as cementitious material; replace heated bitumen or conducting polymer slurry in the known technology; be mixed with slag alkali coke conductive material with this cementitious material with as the coke breeze of conductive carrier with certain proportioning; through activitiess such as mechanically spraying or subsides prefabricated films, conductive layer of the present invention is covered on the body structure surface that needs cathodic protection securely.
In the material of the present invention, the sodium oxide molybdena in slag powders, the alkali-activator, coke breeze and four kinds of components of water scope by weight are 1: (0.03～0.18): (1～2.5): (0.3～1.5).Slag powders is selected metallurgical slag powders or electric heating phosphorus slag powder such as blast furnace slag powder, slag, manganese slag, copper ashes for use, and its fineness is the key factor of chemical reaction velocity and degree, and requiring the powder specific area is 3000～4000cm
2/ g, alkali-activator is optional with water glass, NaOH, potassium hydroxide, sodium carbonate or soda smelt etc., and the modulus of water glass has material impact to the electric conductivity of material, requires its modulus scope between 0.5～2.7.Coke breeze is a particle of getting 0.3mm～5.0mm continuous grading after smelter coke bulk (about about 8cm) is pulverized.
The preparation of conductive material of the present invention can be carried out in test room, also can carry out at building-site.At first load weighted slag powders and coke breeze carry out abundant mix in proportion, and the alkali-activator of additional proportion amount, and fully stirring then is conductive material of the present invention.When adding alkali-activator, can add an amount of water reducing agent such as lignosulfonates, naphthalene sulfonate, to improve the flowability of conductive material mixture.
Conductive material of the present invention directly is coated in needs the reinforced concrete structure of cathodic protection surface; prove with field trial through repeatedly indoor; conductive layer has enough intensity (10～40MPa) and conductance (resistivity is 1～10 Ω cm only); conductive layer thickness only needs 5mm～10mm; protective current is distributed on the whole steel mesh reinforcement more equably, has played the effect of inferior anode.
Conductive material of the present invention can form conductive layer at body structure surface by the method for mechanically spraying.During spraying application, the optimum ratio of conductive material (weight ratio) is: slag powders: the sodium oxide molybdena in the alkali-activator: coke breeze: water: water reducing agent=1: (0.08～0.15): (1.0～1.5): (0.6～1.2): (0.008～0.015).The advantage of mechanically spraying is that construction sequence is few, and progress is fast, the conductive layer densification, and intensity is higher.
Conductive material of the present invention also can be made the thick thin plate of 5～10mm, is attached to and forms conductive layer on the work plane.During prefabricated construction, the optimum ratio of conductive material (weight ratio) is: slag powders: the sodium oxide molybdena in the alkali-activator: coke breeze: water=1: (0.03～0.08): (1.3～2.0): (0.6～1.0).The advantage of precasting process is a uniform resistivity, and equipment energy consumption is low, and is less demanding to the labor technology level.
In addition, for the side construction, it also is feasible manually smearing conductive material of the present invention, smearing thickness 5～10mm, and the conductive layer performance is constant.
Embodiment 1, and mechanically spraying forms conductive layer of the present invention, and the conductive material set of dispense than (weight ratio) is: slag powders: the sodium oxide molybdena in the water glass: coke breeze: water: water reducing agent=1: 0.13: 1.5: 1.2: 0.01, the slag powders fineness was 3500cm
2/ g, modulus of water glass are 2.2, and the coke breeze fineness is the particle of 0.3～2.5mm continuous grading, and it is air compressor machine about 70 liters that the conductive material of the preparation watering can of packing into, single barrel of shower nozzle connect volume, and air-pressure controlling is at 4～7kg/cm
2, before the spraying with graphite anode rod by rights (as use the slag alkali cementitious material) be fixed on the work plane certain position, then with shower nozzle facing to work plane spraying, once spray the thickness that can reach regulation.Adopt spraying coating process, the coke breeze particle is not excessive, and the particle between 0.6～0.3mm is some more, can reduce springback capacity like this, guarantees that conductive layer has excellent conducting performance.
Embodiment 2, paste precast plate and form conductive layer of the present invention.The conductive material set of dispense is that 50% blast furnace slag powder adds 50% steel-making slag powder: the sodium oxide molybdena in the soda smelt: coke breeze: water=1: 0.055: 1.64 than (weight ratio): 0.7, two kind of slag powders fineness is 3500cm
2/ g, coke breeze particle diameter are the particle of 0.3mm～4mm continuous grading, the compaction die moulding of packing into of the conductive material of preparation.This precast plate is the square thin plate of length of side 15cm, 1cm, resistivity 2 Ω cm, compressive strength reached No. 300 in 28 days, with the adhesion strength of base concrete at 10kg/cm
2More than.Precast plate just can paste work plane after 1～3 day maintenance.Before pasting, work plane must be flattened, be coated with the putty of the very thin slag alkali gel of last layer, then precast plate is sticked, press with hand one, sliding to form the adhesive linkage of thick approximately 0.7～1.5mm for twice, and after about 0.5 hour, putty solidifies.Anodic wire (platinized titanium silk or carbon fiber twisted wire) is imbedded in the joint between precast slabs,,, can be switched on, implement cathodic protection through suitable maintenance with conductive material filleting of the present invention compacting.
Conductive layer performance test of the present invention as shown in drawings, Fig. 1 is the work plane sectional view, Fig. 2 is the work plane vertical view.As shown in Figure 1, the salt solution that spills that tested armored concrete slab 1 replaces is repeatedly dried, make it reinforcing bar and suffer more serious corrosion.Half spraying material of the present invention to armored concrete slab 1; form the thick conductive layer 3 of about 8mm; the positive pole of rectifier 6 connects graphite-rod anode 5; negative pole connects steel mesh reinforcement 2; protective current is evenly distributed to whole reinforced concrete surface from anode by conductive layer 3; flow into reinforcing bar by concrete cover, make reinforcing bar obtain uniform cathodic protection.With Cu/CuSO
4Reference electrode inserts gaging hole 4, actual measurement armored concrete slab 1 surface potential, and equipotential diagram is as shown in Figure 2 during cathodic protection.Protection domain is consistent with conductive layer institute covering surfaces basically as can be known by equipotential line 7.
Adopt conductive layer of the present invention; the impressed current cathodic protection technology can be applied to the salt pollution of non-full water or the reinforced concrete structure in the carbonization serious environmental; stop the further corrosion failure of reinforcing bar wherein, and the concrete chisel removal of corrosion cracking not alleviates the repair amount greatly.Lay conductive layer of the present invention, material source is wide, and cost is low, and technology is simple, and the protection parameter is easily regulated control.
Conductive layer of the present invention is except the main application of aforementioned cathodic protection; also have following four aspect purposes: 1. for the lightning arrester of skyscraper and important structure; particularly in soil body the arid desert area, can be used as the skin of grounding body, greatly reducing ground resistance. 2. can be used as the cover layer that electrical body such as oil tank surface prevent electric spark. 3. can be in atmosphere after steel construction applies dielectric type or ionic cover layer, cover again material conductive layer of the present invention, carry out cathodic protection. 4. because material thermal capacity height of the present invention, thermal conductivity are good, can also replace metal resistor as the Power Resistor in the big electric current power transmission and transformation system, improve for electrical stability.
Claims (10)
1, a kind of inferior anode conductive layer that is covered in the reinforced concrete structure surface, structure is carried out cathodic protection by impressed current; with the coke breeze is conductive carrier; it is characterized in that conductive is the mixture of slag powders, alkali-activator and coke breeze, its components by weight scope is: slag powders: the sodium oxide molybdena in the alkali-activator: coke breeze: water=1: (0.03～0.18): (1～2.5): (0.3～1.5).
2, according to claim 1 anode conductive layer is characterized in that conductive layer thickness is 5～10mm.
3, according to claim 1 anode conductive layer is characterized in that slag powders is metallurgical slag powders or electric heating phosphorus slag powder such as blast furnace slag powder, slag, copper ashes, manganese slag, and the powder specific area is 3000～4000cm
2/ g, alkali-activator are water glass, NaOH, potassium hydroxide, sodium carbonate or soda smelt, and the modulus of water glass is 0.5～2.7, and coke breeze is got the particle that 0.3mm～5.0mm has continuous grading after being pulverized by the smelter coke bulk.
4, according to claim 1 anode conductive layer is characterized in that slag powders and the abundant mix of coke breeze with weighing in proportion, and the alkali-activator of additional proportion amount fully stirs then, preparation.
5, according to claim 4 anode conductive layer is characterized in that preparing slag alkali coke breeze mixture, when adding alkali-activator, adds a small amount of water reducing agent, as lignosulfonates, naphthalene sulfonate.
6, according to claim 4 anode conductive layer is characterized in that the job practices by mechanically spraying, makes slag alkali coke breeze mixture form conductive layer on the reinforced concrete structure surface.
7, according to claim 4 anode conductive layer is characterized in that the job practices by preparation precast plate subsides work plane, makes slag alkali coke breeze mixture form conductive layer on the reinforced concrete structure surface.
8, according to claim 4 anode conductive layer is characterized in that the job practices by manually smearing, and makes slag alkali coke breeze mixture form conductive layer on the reinforced concrete structure surface.
9, according to claim 6 anode conductive layer, when it is characterized in that the mechanically spraying construction, material component weight ratio scope is: slag powders: the sodium oxide molybdena in the alkali-activator: coke breeze: water: water reducing agent=1: (0.08～0.15): (1.0～1.5) (0.6～1.2) (0.008～0.015).
10, according to claim 7 anode conductive layer, when it is characterized in that preparing the construction of precast plate subsides work plane, material component weight ratio scope is: slag powders: the sodium oxide molybdena in the alkali lye exciting agent: coke breeze: water=1: (0.03～0.08): (1.3～2.0): (0.6～1.0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105421 CN1016977B (en) | 1988-06-06 | 1988-06-06 | Electroconductive layer for cathod protected reinforced concrete constructure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105421 CN1016977B (en) | 1988-06-06 | 1988-06-06 | Electroconductive layer for cathod protected reinforced concrete constructure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1038481A CN1038481A (en) | 1990-01-03 |
| CN1016977B true CN1016977B (en) | 1992-06-10 |
Family
ID=4833615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105421 Expired CN1016977B (en) | 1988-06-06 | 1988-06-06 | Electroconductive layer for cathod protected reinforced concrete constructure |
Country Status (1)
| Country | Link |
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| CN (1) | CN1016977B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4909076B2 (en) * | 2003-10-10 | 2012-04-04 | ウイットモア、デビッド | Cathodic protection of steel in the cover material |
| CN101839024A (en) * | 2010-04-13 | 2010-09-22 | 水利部交通运输部国家能源局南京水利科学研究院 | Electric field salt rejection protective system protected by reinforced concrete structure in chloride environment |
| CN103382093B (en) * | 2013-07-04 | 2016-04-06 | 蔡庆宗 | The preparation method of conducting concrete block, conducting concrete block and forming mould |
| CN103833279A (en) * | 2014-02-14 | 2014-06-04 | 浙江建设职业技术学院 | Conductive mortar used for cathodic protection of reinforced concrete structure and application thereof |
| CN106836227B (en) * | 2017-01-03 | 2019-11-26 | 深圳大学 | A kind of reinforced concrete structure and its method of construction of included cathodic protection function |
| CN106836622B (en) * | 2017-01-03 | 2020-01-21 | 深圳大学 | Multifunctional disassembly-free template made of fiber composite material and preparation method of multifunctional disassembly-free template |
| CN109322700B (en) * | 2018-07-30 | 2020-05-22 | 中煤科工集团西安研究院有限公司 | Electromigration device for preventing mine concrete well bore from being damaged by ion erosion |
| CN110669320A (en) * | 2019-08-26 | 2020-01-10 | 天津柯文实业股份有限公司 | Preparation method of high-impact-resistance high-low-temperature-resistance poly (p-xylylene glycol terephthalate) |
| CN111778031B (en) * | 2020-06-23 | 2022-01-04 | 北京建工环境修复股份有限公司 | Soil remediation agent and preparation method and application thereof |
-
1988
- 1988-06-06 CN CN 88105421 patent/CN1016977B/en not_active Expired
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| Publication number | Publication date |
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| CN1038481A (en) | 1990-01-03 |
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