CN106854047A - A kind of method for controlling metro stray current corrosion armored concrete - Google Patents
A kind of method for controlling metro stray current corrosion armored concrete Download PDFInfo
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- CN106854047A CN106854047A CN201611189616.3A CN201611189616A CN106854047A CN 106854047 A CN106854047 A CN 106854047A CN 201611189616 A CN201611189616 A CN 201611189616A CN 106854047 A CN106854047 A CN 106854047A
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- hydroxide
- concrete
- armored concrete
- stray current
- layered double
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
The present invention relates to a kind of method for controlling metro stray current corrosion armored concrete, layered double-hydroxide (hydrotalcite) calcining is soaked the hydrotalcite after calcining, with water filtration, drying in sodium hydroxide solution；Dried hydrotalcite, mixes in concrete gel material, is mixed in mixer, pours formation of concrete.The present invention changes the activity of effects of ion, so as to change electrode electromotive force, can reduce the motive force of cell reaction, controls the generation of metro stray current corrosion armored concrete.
Description
Technical field
The invention belongs to subway infrastructure technique field, the invention discloses one kind control metro stray current corrosion reinforcing bar
The method of concrete.
Background technology
Stray electrical current is also easy to produce during metro operation, triggers reinforcing bar that electrochemical corrosion occurs, have a strong impact on subway reinforcing bar
Concrete structure durability and service life, very big potential safety hazard is left to metro operation.At present, both at home and abroad generally in concrete
Middle addition mineral admixture, using secondly subvolcano ash effect and Micro-aggregate filling effect, optimizes the pore structure of air-free concrete,
The ion concentration in hole solution is reduced, the impedance behavior of reinforcing steel bar concrete is reduced by the electricity of reinforcing bar, reduces stray electrical
Flow the corrosion to reinforcing bar.Although mineral admixture increased the density and insulating properties of concrete, cement slurry is the reduction of
The quantity (mainly Ca (OH) 2) of neutral and alkali material, reduces the alkaline reserve of concrete, increases Corroded Reinforced Concrete wind
Danger, it is unfavorable to armored concrete antiseptic property in the long run.
A kind of a kind of " functional steel reinforced concrete is disclosed in number of patent application is for the patent of " 201510627188.7 "
The preparation method of corrosion inhibiter ".The patent is to be internally embedded OH by layered double-hydroxide-With phthalic acid radical ion, with
Cl in concrete corrosion environment-、SO4 2-Exchange, to discharging OH in concrete hole solution-, increase the PH of concrete
Value, reduces carbonization；Reduce Cl in external environment-、SO4 2-Into inside concrete, corrosion inhibiter phthalate is discharged
Ion.The corrosion inhibiter ion for particularly discharging, can effectively suppress the chemical attack of reinforcing bar, but to electrolytic etching, the i.e. function of current
Under corrosion it is not necessarily effective.Because in concrete, although reduce Cl in external environment-、SO4 2-Etc. entering inside concrete
Quantity, but corrosion inhibiter ion is increased in concrete hole solution, equivalent to the conduction for artificially increasing concrete hole solution
Ability.When there is electric current to pass through, electrolytic corrosion speed is increased.In a word, in the file of retrieval, mainly by stratiform hydroxide
The phthalic acid radical ion of thing insertion, exchanges with the sulfate ion in erosion environment, reduces sulfate ion in environment,
Phthalic acid radical ion is increased, and there is O-phthalic acid ion good reinforcing bar resistance rust to act on.But electrolytic corrosion essence
On belong to electrolysis corrosion, it is different from chemical attack, dividing for electrolytic cell can be constituted by increasing reinforcing bar and concrete hole solution
Solution voltage, is difficult to cell reaction, suppresses electrolytic corrosion and occurs.This patent is mainly by layered double-hydroxide, to
OH is introduced in concrete hole solution-, increase OH-Ionic activity, while reducing SO in concrete hole solution4 2-Ion concentration.OH-From
Sub- activity increases, based on Nernst equation, it is possible to increase reinforcing bar constitutes the decomposition voltage of electrolytic cell with concrete hole solution, makes electrolysis
Reaction is difficult to.Meanwhile, SO in hole solution4 2-Into inside layered double-hydroxide, free SO4 2-Ion concentration reduction,
Total conductivity increase in hole solution, conductive capability reduction, so as to suppress the generation of metro stray current corrosion armored concrete.
The content of the invention
The present invention provides a kind of method for controlling metro stray current corrosion armored concrete.Metro stray current is to coagulation
The corrosion of reinforcing bar is inherently electrolysis in soil structure, and the electromotive force with its negative and positive polar region is closely related, and concrete hole
The activity of effects of ion directly affects the size of electrode electromotive force；Therefore the activity of effects of ion is changed, so as to change electricity
Pole electromotive force, can reduce the motive force of cell reaction, control the generation of metro stray current corrosion armored concrete.
Based on above-mentioned analysis, what the present invention was realized in：
A kind of method for controlling metro stray current corrosion armored concrete, layered double-hydroxide is calcined, and will be calcined
Layered double-hydroxide afterwards soaks in sodium hydroxide solution, with water filtration, drying；Dried layered double-hydroxide,
It is incorporated into concrete gel material, is mixed in mixer, pours shaping armored concrete.
Further, the calcining heat of layered double-hydroxide is controlled at 500 DEG C -600 DEG C.
Further, the calcination time of layered double-hydroxide is controlled in 6h-8h.
Further, the concentration of sodium hydroxide solution of the layered double-hydroxide stone immersion after calcining is mass ratio 20%-
40%.
Further, time a length of 12h-24h of the NaOH of the layered double-hydroxide immersion after calcining.
Further, dried layered double-hydroxide adds the ratio of concrete to should be 5%-10%.
Layered double-hydroxide realizes the suction-operated of anion in concrete, is the commutative of interlayer object anion
Property and reconstruction.To improve the effect of layered double-hydroxide adsorpting anion, it is necessary to enter to layered double-hydroxide using preceding
Row calcination processing.Foundation calcination dynamics principle, the calcining heat of layered double-hydroxide and time, directly affect the double hydrogen of stratiform
The adsorption activity of oxide, it is 500 DEG C -600 DEG C, calcination time 6h-8h, stratiform to control the calcining heat of layered double-hydroxide
The intercalation exchange adsorption best results of double-hydroxide.
To the layered double-hydroxide after calcining, need in sodium hydroxide solution further immersion treatment, to increase stratiform
Double-hydroxide interlayer OH-Content, improve SO in layered double-hydroxide and concrete hole solution4 2-Exchange intercalation efficiency,
Increase OH in concrete hole solution-Activity, reduces SO4 2-Activity.Layered double-hydroxide is at the immersion in sodium hydroxide solution
Science and engineering skill, OH in influence layered double-hydroxide-Content, further in influence layered double-hydroxide and concrete hole solution
SO4 2-Exchange intercalation efficiency.Control concentration of sodium hydroxide solution for mass ratio 20%-40%, soak time is 12h-24h, layer
OH in shape double-hydroxide-Content it is most.
Treatment is dried to the layered double-hydroxide after sodium hydroxide solution soaks, in addition concrete.Due to
Layered double-hydroxide specific surface area is big, and is acted on Inter layer adsorption, therefore in layered double-hydroxide incorporation concrete, directly
Connect influence workability of concrete.Therefore the optimum mix amount of the layered double-hydroxide in concrete, is Binder Materials in concrete
The 5%-10% of quality.
Control principle of the invention is as follows：
SO in concrete hole solution4 2-Ionic strength is more than OH-, with OH in hydrotalcite in armored concrete-It is susceptible to
Ion exchange, intercalation enters hydrotalcite layers, displaces OH-, improves decomposition voltage, reduces metro stray current intensity 80%-
95%.
Due to containing carbon impurity in reinforcing bar, under stray electrical current effect, reinforcing bar constitutes electrolytic cell, hair with concrete hole solution
The following cell reaction of life：
Anode reaction：Fe→Fe2++2e
Cathode reaction：2H2O+2e→H2(g)+2OH-
According to Nernst equation, the Electromotive Difference Of Potential of anode and cathode is：
In above-mentioned equation, if adding OH- in ferrous hydroxide, solution, (Fe2+)×(OH-)2Activity product increase,
Reinforcing bar then becomes big with the decomposition voltage E of concrete hole solution composition electrolytic cell.According to Ji Busi letter number ⊿ G=-zFE, when E increases
Big , Ze ⊿ G diminish, then be unfavorable for that cell reaction is carried out (because electrolytic cell is the reaction for carrying out Gibbs function increase), therefore
Stray current corrosion armored concrete can effectively be suppressed.
The present invention changes the activity of effects of ion, so as to change electrode electromotive force, can reduce the promotion of cell reaction
Power, controls the generation of metro stray current corrosion armored concrete.
Beneficial effects of the present invention are as follows：
The present invention based on the basic theories of electrochemical corrosion armored concrete, using in layered dihydroxyl compound from
Sub- intercalation is exchanged, and improves the activity of OH- in armored concrete hole solution, increase reinforcing bar and concrete hole solution composition electrolytic cell
Decomposition voltage, reduces the Ji Busi letter number ⊿ G (because electrolytic cell is the reaction for carrying out Gibbs function increase) of cell reaction, suppression
The chemical reaction of metro stray current corrosion armored concrete processed occurs, and improves steel-concrete interface plot structure.
Specific embodiment
The present invention is described in detail below：
Embodiment 1
A kind of method for controlling metro stray current corrosion armored concrete, layered double-hydroxide (hydrotalcite) is existed
6h is calcined in the range of 500 DEG C, the hydrotalcite after calcining is then soaked into 12h in the sodium hydroxide solution that mass ratio is 20%,
With water filtration, drying.In mass ratio it is 5% by dried hydrotalcite, mixes in concrete gel material, is mixed in mixer
Stirring is closed, shaping armored concrete is poured.
Embodiment 2
A kind of method for controlling metro stray current corrosion armored concrete, layered double-hydroxide (hydrotalcite) is existed
7h is calcined in the range of 550 DEG C, the hydrotalcite after calcining is then soaked into 18h in the sodium hydroxide solution that mass ratio is 30%,
With water filtration, drying.In mass ratio it is 8% by dried hydrotalcite, mixes in concrete gel material, is mixed in mixer
Stirring is closed, shaping armored concrete is poured.
Embodiment 3
A kind of method for controlling metro stray current corrosion armored concrete, layered double-hydroxide (hydrotalcite) is existed
7.5h is calcined in the range of 580 DEG C, then the hydrotalcite after calcining is soaked in the sodium hydroxide solution that mass ratio is 35%
20h, with water filtration, drying.In mass ratio it is 9% by dried hydrotalcite, in incorporation concrete gel material, in mixer
Interior mixing, pours shaping armored concrete.
Embodiment 4
A kind of method for controlling metro stray current corrosion armored concrete, layered double-hydroxide (hydrotalcite) is existed
8h is calcined in the range of 600 DEG C, the hydrotalcite after calcining is then soaked into 24h in the sodium hydroxide solution that mass ratio is 40%,
With water filtration, drying.In mass ratio it is 10% by dried hydrotalcite, in incorporation concrete gel material, in mixer
Mix, pour shaping armored concrete.
The concrete principle of aforementioned four embodiment is as follows：
SO in concrete hole solution4 2- ionic strength is susceptible to more than OH- in hydrotalcite in OH-, with armored concrete
Ion exchange, intercalation enters hydrotalcite layers, displaces OH-, improves decomposition voltage, reduces metro stray current intensity 80%-
95%.
Due to containing carbon impurity in reinforcing bar, under stray electrical current effect, reinforcing bar constitutes electrolytic cell, hair with concrete hole solution
The following cell reaction of life：
Anode reaction：Fe→Fe2++2e
Cathode reaction：2H2O+2e→H2(g)+2OH-
According to Nernst equation, the Electromotive Difference Of Potential of anode and cathode is：
In above-mentioned equation, if adding OH- in ferrous hydroxide, solution, (Fe2+)×(OH-)2Activity product increase,
Reinforcing bar then becomes big with the decomposition voltage E of concrete hole solution composition electrolytic cell.According to Ji Busi letter number ⊿ G=-zFE, when E increases
Big , Ze ⊿ G diminish, then be unfavorable for that cell reaction is carried out (because electrolytic cell is the reaction for carrying out Gibbs function increase), therefore
Stray current corrosion armored concrete can effectively be suppressed.
The present invention changes the activity of effects of ion, so as to change electrode electromotive force, can reduce the promotion of cell reaction
Power, controls the generation of metro stray current corrosion armored concrete.
The present invention based on the basic theories of electrochemical corrosion armored concrete, using in layered dihydroxyl compound from
Sub- intercalation is exchanged, and improves the activity of OH- in armored concrete hole solution, increase reinforcing bar and concrete hole solution composition electrolytic cell
Decomposition voltage, reduces the Ji Busi letter number ⊿ G (because electrolytic cell is the reaction for carrying out Gibbs function increase) of cell reaction, suppression
The chemical reaction of metro stray current corrosion armored concrete processed occurs, and improves steel-concrete interface plot structure.
Although above-mentioned is that specific embodiment of the invention is described, not to the limit of the scope of the present invention
System, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art need not pay
The various modifications or deformation made by going out creative work are still within protection scope of the present invention.
Claims (6)
1. it is a kind of control metro stray current corrosion armored concrete method, it is characterised in that：Layered double-hydroxide is forged
Burn, the layered double-hydroxide after calcining is soaked in sodium hydroxide solution, with water filtration, drying；Dried stratiform is double
Hydroxide, is incorporated into concrete gel material, is mixed in mixer, pours shaping armored concrete.
2. it is according to claim 1 it is a kind of control metro stray current corrosion armored concrete method, it is characterised in that：
The calcining heat of layered double-hydroxide is controlled at 500 DEG C -600 DEG C.
3. it is according to claim 1 it is a kind of control metro stray current corrosion armored concrete method, it is characterised in that：
The calcination time of layered double-hydroxide is controlled in 6h-8h.
4. it is according to claim 1 it is a kind of control metro stray current corrosion armored concrete method, it is characterised in that：
The concentration of sodium hydroxide solution of the layered double-hydroxide stone immersion after calcining is mass ratio 20%-40%.
5. it is according to claim 1 it is a kind of control metro stray current corrosion armored concrete method, it is characterised in that：
Time a length of 12h-24h of the NaOH of the layered double-hydroxide immersion after calcining.
6. it is according to claim 1 it is a kind of control metro stray current corrosion armored concrete method, it is characterised in that：
Dried layered double-hydroxide adds the ratio of concrete to should be 5%-10%.
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| CN201611189616.3A CN106854047A (en) | 2016-12-21 | 2016-12-21 | A kind of method for controlling metro stray current corrosion armored concrete |
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| CN201611189616.3A CN106854047A (en) | 2016-12-21 | 2016-12-21 | A kind of method for controlling metro stray current corrosion armored concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109214121A (en) * | 2018-10-17 | 2019-01-15 | 哈尔滨工业大学 | Reinforced concrete structure erosion electric drive unified control method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239733A (en) * | 2008-03-05 | 2008-08-13 | 北京化工大学 | Method for preparing calcium aluminum hydrotalcite used as concrete additive |
| US7879146B2 (en) * | 2005-08-01 | 2011-02-01 | National Research Council Of Canada | Controlled release of chemical admixtures |
| CN102584077A (en) * | 2012-01-16 | 2012-07-18 | 中国建筑科学研究院 | Loading-type reinforcing steel bar corrosion inhibitor and preparation method thereof |
| CN102863174A (en) * | 2012-09-08 | 2013-01-09 | 王桂明 | Cement concrete corrosion inhibitor |
| CN104276777A (en) * | 2014-09-12 | 2015-01-14 | 河海大学 | Chloride ion immobilizing agent |
| CN105084798A (en) * | 2015-08-04 | 2015-11-25 | 河海大学 | Concrete sulfate-corrosion-resistant additive and preparation method thereof |
| CN105174773A (en) * | 2015-09-28 | 2015-12-23 | 厦门大学 | Preparation method of multifunctional reinforced concrete corrosion inhibitor |
| CN105254196A (en) * | 2015-10-27 | 2016-01-20 | 华北水利水电大学 | Cement concrete modifying agent resistant to sulfate erosion and preparation method thereof |
| CN105776932A (en) * | 2016-03-07 | 2016-07-20 | 浙江大学宁波理工学院 | Reinforcing steel bar rust-prevention material applicable to interior of concrete and application of reinforcing steel bar rust-prevention material |
-
2016
- 2016-12-21 CN CN201611189616.3A patent/CN106854047A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7879146B2 (en) * | 2005-08-01 | 2011-02-01 | National Research Council Of Canada | Controlled release of chemical admixtures |
| CN101239733A (en) * | 2008-03-05 | 2008-08-13 | 北京化工大学 | Method for preparing calcium aluminum hydrotalcite used as concrete additive |
| CN102584077A (en) * | 2012-01-16 | 2012-07-18 | 中国建筑科学研究院 | Loading-type reinforcing steel bar corrosion inhibitor and preparation method thereof |
| CN102863174A (en) * | 2012-09-08 | 2013-01-09 | 王桂明 | Cement concrete corrosion inhibitor |
| CN104276777A (en) * | 2014-09-12 | 2015-01-14 | 河海大学 | Chloride ion immobilizing agent |
| CN105084798A (en) * | 2015-08-04 | 2015-11-25 | 河海大学 | Concrete sulfate-corrosion-resistant additive and preparation method thereof |
| CN105174773A (en) * | 2015-09-28 | 2015-12-23 | 厦门大学 | Preparation method of multifunctional reinforced concrete corrosion inhibitor |
| CN105254196A (en) * | 2015-10-27 | 2016-01-20 | 华北水利水电大学 | Cement concrete modifying agent resistant to sulfate erosion and preparation method thereof |
| CN105776932A (en) * | 2016-03-07 | 2016-07-20 | 浙江大学宁波理工学院 | Reinforcing steel bar rust-prevention material applicable to interior of concrete and application of reinforcing steel bar rust-prevention material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109214121A (en) * | 2018-10-17 | 2019-01-15 | 哈尔滨工业大学 | Reinforced concrete structure erosion electric drive unified control method |
| CN109214121B (en) * | 2018-10-17 | 2022-01-25 | 哈尔滨工业大学 | Reinforced concrete structure corrosion electric drive unified control method |
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Application publication date: 20170616 |