CN108589935B - A kind of surface modifying method improving reinforced steel bar rust preventing erosion ability - Google Patents
A kind of surface modifying method improving reinforced steel bar rust preventing erosion ability Download PDFInfo
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- CN108589935B CN108589935B CN201810480824.1A CN201810480824A CN108589935B CN 108589935 B CN108589935 B CN 108589935B CN 201810480824 A CN201810480824 A CN 201810480824A CN 108589935 B CN108589935 B CN 108589935B
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- reinforcing bar
- nano
- silicon dioxide
- modified dose
- dioxide modified
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/64—Insulation or other protection; Elements or use of specified material therefor for making damp-proof; Protection against corrosion
- E04B1/642—Protecting metallic construction elements against corrosion
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1066—Oxides, Hydroxides
Abstract
A kind of surface modifying method improving reinforced steel bar rust preventing erosion ability, belongs to building material technical field.The method is as follows: rebar surface is cleaned up with ethyl alcohol, then drying for standby；Nano-silicon dioxide modified dose of preparation: it takes isometric second alcohol and water as solvent, suitable cetyl trimethylammonium bromide and ethyl orthosilicate is added to get to nano-silicon dioxide modified dose；Reinforcing bar is placed in nano-silicon dioxide modified dose, the two comes into full contact with, the ultrasonic probe that power is 10kHz ~ 60kHz is placed in nano-silicon dioxide modified dose, ammonium hydroxide is added dropwise in ultrasound to pH=8 ~ 9,2 ~ 6 h are reacted at a temperature of 60 ~ 90 DEG C, reinforcing bar taking-up is rinsed, then 105 DEG C of 1 ~ 2 h of drying with ethyl alcohol, that is, completed modified to the surface of reinforcing bar.Nano-meter SiO_2 of the invention2Modifying agent preparation process is simple, and preparation speed is fast, easy to use, and the surface that this method is suitable for various reinforcing bars is modified, is suitable for large-scale mass production and practical engineering application.
Description
Technical field
The invention belongs to the technical fields of reinforced steel bar rust preventing, and in particular to a kind of surface for improving reinforced steel bar rust preventing erosion ability is modified
Method.
Background technique
According to the statistical data of world's corrosion structure (WCO), the whole world economic loss as caused by steel bar corrosion every year
More than 2.2 trillion dollars.Reinforced concrete structure is most important in current and considerable time from now in world wide
Structure type.Reinforced concrete structure fully utilize concrete and reinforcing bar easily construct and concrete anti-compression and reinforcing bar tension it is excellent
Gesture has pushed the construction of contemporary civil engineering structure significantly, and in traffic, harbour, house is answered extensively in all kinds of engineerings such as nuclear power station
With providing important foundation and support for the development of the mankind.On the other hand, reinforced concrete structure also occurs in use
Many endurance issues, steel bar corrosion are the main reasons for causing reinforced concrete structure durability to reduce, especially
In the coastal south.On the one hand steel bar corrosion causes reinforcing bar bearing capacity to decline, on the other hand corrosion expansion will cause coagulation
Protective soil layer cracking falls off, and further destroys structural integrity, influences structure safe handling.The U.S. has more than 20000 reinforcing bars
There is heavy corrosion phenomenon in concrete bridge；Japan is as caused by reinforcement corrosion there are about the damage of 21.4% steel and concrete structure；China
Only Dangerous highway bridge will be just up to more than 9000 in the end of the year 2002, and 40,000,000 yuan of cost of Shandong Yantai bus station, even more after building up 5 years
2009 high tower, wherein reinforcement corrosion is one of the main reason for causing structure military service major cycle.With " one
Band is all the way " strategy implementation, China will also persistently carry out a large amount of infrastructure construction, and improve the anti-corrosion ability of reinforcing bar, right
It ensures that the safety of important infrastructure is on active service, reduces maintenance and repair expense, it is significant.
It is porous material that the main reason for Reinforcing Steel Bar In Reinforced Concrete Structure corrodes, which is concrete, thus oxygen and moisture and
After chloride ion enters concrete and reaches rebar surface, rebar surface passivation layer gradually destroys and occurs local galvanic interaction,
Namely start to corrode.One of method for improving armored concrete anti-corrosion ability uses high-performance antirust reinforcing bar, improves reinforcing bar
The anti-corrosion ability of material itself, but in the infrastructure construction having a large capacity and a wide range, it is difficult to anti-corrosion reinforcing bar is used comprehensively；Another row
Effective method be to separate contact of the reinforcing bar with corrosive medium: rebar surface plates non-corrosive metal (NCM) layer, brushwork epoxy resin, or logical
It crosses and improves concrete impervious ability corrosive media is made to be difficult to reach rebar surface, such as brushwork epoxy resin, but this method is deposited
Weakening reinforcing bar adhesion strength or is improving that concrete density is of a high price equal to be limited comprehensively.
Summary of the invention
The purpose of the present invention is to solve the reinforcing bars in existing reinforced concrete structure during military service easy-to-rust
Problem, the surface modifying method for providing a kind of raising reinforced steel bar rust preventing erosion ability can be used to prepare life on the basis of existing reinforcing bar
Produce the reinforcing bar of high antirust ability.Specific method of modifying is to grow 200 ~ 6000nm of a layer thickness, Neng Gouyu on the surface of reinforcing bar
Portland cement or the amorphous Si O of ordinary portland cement reaction2Protective layer, the SiO2On the one hand protective layer itself can play
Buffer action is protected, contact of the reinforcing bar with corrosive media is obstructed, prevents from corroding；On the other hand, the SiO2Protective layer can part
The hydrated calcium silicate gel class product that volume expansion is generated with the calcium hydroxide reaction in reinforcing bar surrounding concrete in reinforcing bar and mixes
The interface area for coagulating soil forms fine and close impervious layer, prevents the entrance of water, oxygen and chloride ion, is badly taking to greatly improve reinforcing bar
The antirust ability under environment is used as a servant, ensures that reinforced concrete structure is on active service safely.
To achieve the above object, the technical solution adopted by the present invention is as follows:
A kind of surface modifying method improving reinforced steel bar rust preventing erosion ability, specific step is as follows for the method:
Step 1: rebar surface is cleaned up with ethyl alcohol, then drying for standby；
Step 2: it nano-silicon dioxide modified dose of preparation: takes isometric second alcohol and water as solvent, weighs solvent matter
The deionization surfactant cetyl trimethylammonium bromide for measuring score 1% is added, the positive silicic acid of solvent quality score 6 ~ 12%
Ethyl ester is added to arrive nano-silicon dioxide modified dose；
Step 3: the surface of reinforcing bar is modified: the nano silica that the reinforcing bar in step 1 is placed in step 2 preparation is changed
Property agent in, reinforcing bar comes into full contact with nano-silicon dioxide modified dose, by power be 10kHz ~ 60kHz ultrasonic probe be placed in nanometer
In silica modified dose, 2 ~ 6 h are reacted at a temperature of ammonium hydroxide to pH=8 ~ 9,60 ~ 90 DEG C is added dropwise in the side Bian Chaosheng, and reinforcing bar is taken out and is used
Ethyl alcohol rinses, then 105 DEG C of 1 ~ 2 h of drying, that is, completes modified to the surface of reinforcing bar.
The beneficial effect of the present invention compared with the existing technology is:
(1) Nano-meter SiO_2 of the invention2Modifying agent preparation process is simple, and preparation speed is fast, easy to use, and this method is applicable in
It is modified in the surface of various reinforcing bars, it is suitable for large-scale mass production and practical engineering application.
(2) present invention carries out surface growth SiO to reinforcing bar2Modification, the SiO of rebar surface2Protective layer homeostasis
Not aging can store for a long time；Water, oxygen and chloride ion contact reinforcing bar can be obstructed in concrete, avoid corroding.
(3) present invention in rebar surface SiO2Protective layer can occur part with the calcium hydroxide in concrete and react generation
Hydrated calcium silicate gel class product blocks the hole between reinforcing bar and concrete, and it is anti-that fine and close hydrated product is formed around reinforcing bar
Sheath further enhances the isolation effect of reinforcing bar and corrosive medium, strengthens antirust ability.It is generally mixed compared in concrete
Add silicon ash and Nano-meter SiO_22Impermeability is improved, method of the invention can play better invigoration effect.
(4) modified antirust reinforcing bar of the invention, surface itself is inactive, but the hydration activity that can be reacted with cement
Nano-meter SiO_22While playing rust-proof effect, the interface compactness of reinforcing bar and concrete can be improved by reacting with concrete
(being increased to 0.95 or more from 0.75), interface binding intensity (being increased to 7MPa or more from 3MPa or so), further improves steel
The resistance to plucking output capacity of muscle, is conducive to the bearing capacity for improving reinforced concrete member and safe military service is horizontal.
Specific embodiment
Below with reference to embodiment, further description of the technical solution of the present invention, and however, it is not limited to this, all right
Technical solution of the present invention is modified or equivalent replacement, without departing from the spirit of the technical scheme of the invention range, should all cover
Among protection scope of the present invention.
The present invention carries out surface to reinforcing bar and grows SiO2Modification, prepare antirust reinforcing bar.The SiO on surface2Protective layer can
Barrier reinforcing bar is contacted with corrosive medium, avoids corroding；And the SiO2Layer occurs partially to react with surrounding concrete makes surrounding
Concrete is finer and close, and barrier corrosive medium penetrates into rebar surface, strengthens antirust ability.
Specific embodiment 1: present embodiment record is a kind of surface modification side for improving reinforced steel bar rust preventing erosion ability
Method, specific step is as follows for the method:
Step 1: rebar surface is cleaned up with ethyl alcohol, then drying for standby；
Step 2: it nano-silicon dioxide modified dose of preparation: takes isometric second alcohol and water as solvent, weighs solvent matter
The deionization surfactant cetyl trimethylammonium bromide (CTAB) for measuring score 1% is added, solvent quality score 6 ~ 12%
Ethyl orthosilicate (TEOS) is added to arrive nano-silicon dioxide modified dose；
Step 3: the surface of reinforcing bar is modified: the nano silica that the reinforcing bar in step 1 is placed in step 2 preparation is changed
Property agent in, reinforcing bar comes into full contact with nano-silicon dioxide modified dose, by power be 10kHz ~ 60kHz ultrasonic probe be placed in nanometer
In silica modified dose, 2 ~ 6 h are reacted at a temperature of ammonium hydroxide to pH=8 ~ 9,60 ~ 90 DEG C is added dropwise in the side Bian Chaosheng, and reinforcing bar is taken out and is used
Ethyl alcohol rinses, then 105 DEG C of 1 ~ 2 h of drying, that is, completes modified to the surface of reinforcing bar.Reinforcing bar at this time has been equipped with antirust energy
Power, nothing that surface growth has 200 ~ 6000nm of a layer thickness, can reacting with portland cement or ordinary portland cement are fixed
Shape thin layer of silicon dioxide.
Specific embodiment 2: a kind of surface modification side of raising reinforced steel bar rust preventing erosion ability described in specific embodiment one
Method, in step 1, the reinforcing bar includes the Ribbed Bar and plain steel-bar of various strength grades and purposes, and reinforcing bar should not become rusty
Erosion.
Claims (2)
1. a kind of surface modifying method for improving reinforced steel bar rust preventing erosion ability, it is characterised in that: specific step is as follows for the method:
Step 1: rebar surface is cleaned up with ethyl alcohol, then drying for standby；
Step 2: it nano-silicon dioxide modified dose of preparation: takes isometric second alcohol and water as solvent, weighs solvent quality point
The deionization surfactant cetyl trimethylammonium bromide of number 1% is added, the ethyl orthosilicate of solvent quality score 6 ~ 12%
It is added to get arriving nano-silicon dioxide modified dose；
Step 3: the surface of reinforcing bar is modified: the reinforcing bar in step 1 is placed in nano-silicon dioxide modified dose of step 2 preparation
In, reinforcing bar comes into full contact with nano-silicon dioxide modified dose, and the ultrasonic probe that power is 10kHz ~ 60kHz is placed in nano-silica
In SiClx modifying agent, 2 ~ 6 h are reacted at a temperature of ammonium hydroxide to pH=8 ~ 9,60 ~ 90 DEG C is added dropwise in the side Bian Chaosheng, reinforcing bar taking-up ethyl alcohol
It rinses, then 105 DEG C of 1 ~ 2 h of drying, that is, completes modified to the surface of reinforcing bar.
2. a kind of surface modifying method for improving reinforced steel bar rust preventing erosion ability according to claim 1, it is characterised in that: step
In one, the reinforcing bar includes the Ribbed Bar and plain steel-bar of various strength grades and purposes, and reinforcing bar should be unattacked.
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| CN201810480824.1A CN108589935B (en) | 2018-05-18 | 2018-05-18 | A kind of surface modifying method improving reinforced steel bar rust preventing erosion ability |
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| CN201810480824.1A CN108589935B (en) | 2018-05-18 | 2018-05-18 | A kind of surface modifying method improving reinforced steel bar rust preventing erosion ability |
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| CN108589935A CN108589935A (en) | 2018-09-28 |
| CN108589935B true CN108589935B (en) | 2019-11-05 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6426438A (en) * | 1987-07-23 | 1989-01-27 | Kobe Steel Ltd | Rust proof steel sheet with organic coating |
| CN102320612A (en) * | 2011-05-26 | 2012-01-18 | 东北师范大学 | Preparation method and application of fluorescence mesoporous silica nano-particle |
| CN104675021B (en) * | 2015-02-10 | 2016-08-24 | 山西省交通科学研究院 | A kind of carbon fiber prestressed concrete and construction method thereof |
| CN105733382B (en) * | 2016-03-07 | 2018-05-04 | 广东省建筑材料研究院 | A kind of micro-nano reinforced steel bar rust preventing agent and preparation method thereof of autoclaved aerated concrete slab |
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