CN105776932A - Reinforcing steel bar rust-prevention material applicable to interior of concrete and application of reinforcing steel bar rust-prevention material - Google Patents
Reinforcing steel bar rust-prevention material applicable to interior of concrete and application of reinforcing steel bar rust-prevention material Download PDFInfo
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- CN105776932A CN105776932A CN201610127992.3A CN201610127992A CN105776932A CN 105776932 A CN105776932 A CN 105776932A CN 201610127992 A CN201610127992 A CN 201610127992A CN 105776932 A CN105776932 A CN 105776932A
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- reinforcing bar
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B2103/61—Corrosion inhibitors
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to a reinforcing steel bar rust-prevention material applicable to the interior of concrete and application of the reinforcing steel bar rust-prevention material.The reinforcing steel bar rust-prevention material is formed by mixing solid powder and mixed liquid in proportion and can directly act on the surfaces of reinforcing steel bars inside the concrete without affecting cohesiveness between the reinforcing steel bars and the concrete.The reinforcing steel bar rust-prevention material is simple in application method, more direct in rust-prevention effect and longer in anti-rust effect, and meanwhile the material has the advantages of being great in chloridion curing capability and great in surface alkality, so that the material is greater in anti-rust capability.
Description
Technical field
The present invention relates to the technical field of construction material, specifically a kind of reinforcing bar suitable in inside concrete hinders rust material and application thereof.
Background technology
Steel bar corrosion caused by chloride erosion is to cause that concrete structure durability deteriorates one of main reason.Coastal, saline and alkaline and deicer salts territory of use, use resistance rust material to become the important technique measure suppressing the internal steel bar corrosion of xoncrete structure.Currently, corrosion inhibitor kind is a lot, the difference according to its component, can be divided into inorganic type, organic type and compound.Traditional concrete reinforcement resistance rust materials'use mode mainly has two kinds, and one is for be directly spiked in concrete, and it is two for being sprayed at concrete outer surface, then infiltrates into inside concrete.But, the restriction of be obstructed rust properties of materials and occupation mode, resistance rust material is difficult to be uniformly adhered to the rebar surface of inside concrete, and therefore resistance rust effect is barely satisfactory.Additionally, although civil engineering exists various metals surface resistance rust material now, but these materials are used in steel construction more, namely metal material is directly exposed in ambient atmosphere environment, surface is except resistance rust material, cover material without other, and owing to material behavior is limit, it cannot be used directly for the reinforcing bar resistance rust of inside concrete.
Summary of the invention
One of the object of the invention is to provide one and has stronger chloride ion ability to cure, and can maintain rebar surface high alkalinity environment, does not affect close-burning reinforcing bar resistance rust material between reinforcing bar and concrete simultaneously.
A kind of reinforcing bar suitable in inside concrete hinders rust material, and this reinforcing bar resistance rust material is to be formed with solid powder mixed preparing by mixing liquid, wherein:
Mixing liquid is made up of alcohol amine compound, dimethyl compounds and solvent；
Solid powder is made up of the layered double hydroxide after cement, flyash and calcining.
As preferably, in described reinforcing bar resistance rust material, mixing liquid is 0.6～0.9:1 with the mass ratio of solid powder, make the viscosity of rebar surface resistance rust material between 10～30mPa s, so both can keep the curing of chloride ion ability of resistance rust material, maintain rebar surface basicity, suitable viscosity and mobility can be made it have again, it is easy to coating.
As preferably, the mixing quality percentage amounts of described mixing liquid is respectively as follows: alcohol amine compound 20～40%, dimethyl compounds 10～25%, solvent 50～70%, mixing liquid is possible not only to promote resistance rust effect further, between its composition, proportionate relationship makes resistance rust material have suitable viscosity and mobility simultaneously, it is easy to is coated in the rebar surface of inside concrete, and does not affect the caking property between reinforcing bar and concrete；The mixing quality percentage amounts of described solid powder is respectively as follows: the layered double hydroxide 60～70% after cement 15～20%, flyash 15～20% and process, in solid powder, the cement of proper content and flyash etc. have the advantages that to strengthen surface alkalinty, simultaneously also active effect and micropowder filling effect, optimize resistance rust material structure, reduce harmful hole content, chloride channel can also be reduced, improve the resistance of concrete to chloride ion penetration of resistance rust material.
As preferably, described layered double hydroxide is magnalium carbonate brucite or magnalium nitrate anion brucite, layered double hydroxide itself has the barrier property of good oxygen and carbon dioxide etc., product alkalescence after calcining strengthens simultaneously, free state chloride ion ability to cure is also relatively strong, and alkaline environment and chloride ion curing performance can stop or delay the corrosion of reinforcing bar.
As preferably, described alcohol amine compound is monoethylene glycol amine or diethanolamine or triethanolamine, described dimethyl compounds is dimethylethanolamine, the purity of this alcohol amine compound and dimethyl compounds is all higher than being equal to 99%, two class materials all improve resistance rust effect, and the purity of material is it is also ensured that resistance rust material hinders rust ability efficiently simultaneously.
As preferably, described solvent is saturated calcium hydroxide aqueous solution (being made up of three grades of pure water), plays dissolution, contributes to maintaining the mobility of resistance rust material on the one hand, also can excite the hydration activity of flyash on the other hand, further enhance the resistance rust effect of material.
The effect that described reinforcing bar resistance rust material prepares by the following method is better, and method step is as follows:
(1) prepared by solid powder: calcined in 3.5～4.5 DEG C/min ramp to the environment of 450～550 DEG C by layered double hydroxide, after constant temperature 4.5～5.5h, naturally cool to room temperature, broken, grinding, sieves, powder after being calcined, then the powder after cement, flyash and calcining is weighed respectively, mixing, obtain solid powder；
(2) prepared by mixed liquor body: weigh alcohol amine compound, dimethyl compounds and solvent respectively, is placed in container by these three kinds of materials, mix homogeneously, obtains mixing liquid；
(3) solid powder that mixing liquid above-mentioned steps (2) prepared prepares with above-mentioned steps (1) mixes, stirring, obtains reinforcing bar resistance rust material.
Additionally, the two of the object of the invention provide the application of a kind of above-mentioned reinforcing bar resistance rust material: this material directly acts on the rebar surface of inside concrete.
The application scheme of reinforcing bar resistance rust material is as follows: described reinforcing bar resistance rust material directly applies to rebar surface, thicknesses of layers controls between 1～2mm, stand 1～1.5h, time is unsuitable long, prevent resistance rust material self condensation cure from affecting rebar surface and concrete bonding, after standing, then at rebar surface casting concrete.
Adopting above method, a kind of reinforcing bar resistance rust material of the present invention compared with prior art has the advantage that
First, free state chloride ion is had stronger solidification by resistance rust material, largely reducing the chloride ion inducing action to steel bar corrosion, improves the stainless property of the reinforcing bar of inside concrete；This resistance rust material can maintain the high alkalinity environment of inside concrete rebar surface so that it is is in inert condition, is not susceptible to corrosion.
Secondly, cement and the flyash of the proper content that the described solid powder in resistance rust material comprises not only have the feature strengthening surface alkalinty, also active effect and micropowder filling effect, optimize resistance rust material structure, reduce harmful hole content, it is also possible to reduce chloride channel, improve the resistance of concrete to chloride ion penetration of resistance rust material, in addition, solid powder is similar to component materials of concrete, without influence on the caking property between reinforcing bar and concrete；The described mixing liquid in resistance rust material can also promote resistance rust effect further, and solid powder makes resistance rust material have suitable viscosity and mobility with mixing proportionate relationship between liquid simultaneously, it is easy to be coated in the rebar surface of inside concrete.
Again, described reinforcing bar resistance rust material directly acts on the rebar surface of inside concrete, therefore, it is possible to be evenly distributed on rebar surface, using method is simple.Meanwhile, the effective ingredient of reinforcing bar resistance rust material concentrates on rebar surface, it is possible to permanent maintenance rebar surface, compared with the CONCENTRATION STATE of high resistant rust material, makes resistance rust effect more directly more permanent, and resistant to rust ability is higher.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the invention will be further described.
In embodiment, cement is commercially available 42.5 grades of Portland cements；Flyash is second class powered coal ash described in national standard " flyash (GB/T1596-2005) in cement and concrete "；Used by process of the test, chemical reagent is analytical grade reagent；Water used in process of the test is three grades of pure water.
Embodiment one:
Magnalium carbonate brucite is calcined in the environment of 550 DEG C.With the ramp of 3.5 DEG C/min, after constant temperature 4.5h, naturally cool to room temperature, broken and grinding, cross 200 mesh sieves, the magnalium carbonate brucite after being calcined；
Prepared by solid powder: weigh the magnalium carbonate brucite after cement, flyash and calcining respectively, and in blender stirring and evenly mixing, obtain solid powder, wherein the mixing quality percentage amounts of solid powder be respectively as follows: cement 15%, flyash 20% and calcining after magnalium carbonate brucite 65%；
Prepared by mixed liquor body: weigh diethanolamine, dimethylethanolamine and saturated calcium hydroxide aqueous solution respectively, these three kinds of materials are placed in container, mix with blender, obtain mixing liquid, the mixing quality percentage amounts wherein mixing liquid is respectively as follows: diethanolamine 20%, dimethylethanolamine 10%, saturated calcium hydroxide aqueous solution 70%；
Mixing liquid above-mentioned steps prepared injects in the solid powder that above-mentioned steps prepares, and wherein mixing liquid is 0.7:1 with the mass ratio of solid powder, and continuously stirred mixing so that it is viscosity reaches 25mPa s, obtains reinforcing bar resistance rust material.
By prepared reinforcing bar resistance rust material uniform application at rebar surface, film layer THICKNESS CONTROL is at 1～2mm, after standing 1h, at its surface casting concrete.
Embodiment two:
Magnesium aluminum-hydrotalcite is calcined in the environment of 500 DEG C.With the ramp of 4 DEG C/min, after constant temperature 5h, naturally cool to room temperature, broken and grinding, cross 270 mesh sieves, the magnalium nitrate anion brucite after being calcined；
Prepared by solid powder: weigh the magnalium nitrate anion brucite after cement, flyash and calcining respectively, and in blender stirring and evenly mixing, obtain solid powder, wherein the mixing quality percentage amounts of solid powder be respectively as follows: cement 20%, flyash 20% and calcining after magnalium nitrate anion brucite 60%；
Prepared by mixed liquor body: weigh diethanolamine, dimethylethanolamine and saturated calcium hydroxide aqueous solution respectively, these three kinds of materials are placed in container, mix with blender, obtain mixing liquid, the mixing quality percentage amounts wherein mixing liquid is respectively as follows: diethanolamine 30%, dimethylethanolamine 20%, saturated calcium hydroxide aqueous solution 50%；
Mixing liquid above-mentioned steps prepared injects in the solid powder that above-mentioned steps prepares, and wherein mixing liquid is 0.6:1 with the mass ratio of solid powder, and continuously stirred mixing so that it is viscosity reaches 20mPa s, obtains reinforcing bar resistance rust material.
By prepared reinforcing bar resistance rust material uniform application at rebar surface, film layer THICKNESS CONTROL is at 1～2mm, after standing 1h, at its surface casting concrete.
Embodiment three:
Magnesium aluminum-hydrotalcite is calcined in the environment of 450 DEG C.With the ramp of 4.5 DEG C/min, after constant temperature 5.5h, naturally cool to room temperature, broken and grinding, cross 270 mesh sieves, the magnalium nitrate anion brucite after being calcined；
Prepared by solid powder: weigh the magnalium nitrate anion brucite after cement, flyash and calcining respectively, and in blender stirring and evenly mixing, obtain solid powder, wherein the mixing quality percentage amounts of solid powder be respectively as follows: cement 20%, flyash 15% and calcining after magnalium nitrate anion brucite 65%；
Prepared by mixed liquor body: weigh diethanolamine, dimethylethanolamine and saturated calcium hydroxide aqueous solution respectively, these three kinds of materials are placed in container, mix with blender, obtain mixing liquid, the mixing quality percentage amounts wherein mixing liquid is respectively as follows: diethanolamine 30%, dimethylethanolamine 15%, saturated calcium hydroxide aqueous solution 55%；
Mixing liquid above-mentioned steps prepared injects in the solid powder that above-mentioned steps prepares, and wherein mixing liquid is 0.9:1 with the mass ratio of solid powder, and continuously stirred mixing so that it is viscosity reaches 28mPa s, obtains reinforcing bar resistance rust material.
By prepared rebar surface resistance rust material uniform application at rebar surface, film layer THICKNESS CONTROL is at 1～2mm, after standing 1.5h, at its surface casting concrete.
Embodiment four:
Magnesium aluminum-hydrotalcite is calcined in the environment of 500 DEG C.With the ramp of 4 DEG C/min, after constant temperature 5h, naturally cool to room temperature, broken and grinding, cross 250 mesh sieves, the magnalium carbonate brucite after being calcined；
Prepared by solid powder: weigh the magnesium aluminum-hydrotalcite after cement, flyash and calcining respectively, and in blender stirring and evenly mixing, obtain solid powder, wherein the mixing quality percentage amounts of solid powder be respectively as follows: cement 16%, flyash 15% and calcining after magnalium carbonate brucite 69%；
Prepared by mixed liquor body: weigh diethanolamine, dimethylethanolamine and saturated calcium hydroxide aqueous solution respectively, these three kinds of materials are placed in container, mix with blender, obtain mixing liquid, the mixing quality percentage amounts wherein mixing liquid is respectively as follows: diethanolamine 40%, dimethylethanolamine 10%, saturated calcium hydroxide aqueous solution 50%；
Mixing liquid above-mentioned steps prepared injects in the solid powder that above-mentioned steps prepares, and wherein mixing liquid is 0.9:1 with the mass ratio of solid powder, and continuously stirred mixing so that it is viscosity reaches 28mPa s, obtains rebar surface resistance rust material.
By prepared rebar surface resistance rust material uniform application at rebar surface, film layer THICKNESS CONTROL is at 1～2mm, after standing 1.5h, at its surface casting concrete.
The resistance rust effect of the reinforcing bar resistance rust material of inside concrete it is applicable to below by the relevant verification experimental verification present invention.
Experiment one, electrochemistry experiment: according to appendix A .2 electrochemical test method in YBT9231-2009 " reinforcing bar resistance rust application technology code ", the resistance rust material of this patent being carried out performance detection, test test specimen is mortar specimen.Detection sample has five groups, does not respectively mix the blank sample of resistance rust material, fills the detection sample of reinforcing bar resistance rust material in the embodiment one involved by patent of the present invention, embodiment two, embodiment three, embodiment four, and the current test results after energising 168h is as shown in table 1.
The current test results of table 1 anticorrosion performance detection
| Sample | Blank sample | Embodiment one | Embodiment two | Embodiment three | Embodiment four |
| Current intensity μ A | 168 | 95 | 100 | 83 | 80 |
According to YBT9231-2009 " reinforcing bar resistance rust application technology code " related request, in embodiment one involved by patent of the present invention, embodiment two, embodiment three, embodiment four, the current intensity of the detection sample energising 168h of reinforcing bar resistance rust material is far smaller than the setting of 150 μ A, and this illustrates that reinforcing bar of the present invention resistance rust material has fine ground resistance rust effect.
Experiment two, chloride ion adsorption test: this experiment is mixed the mode of sodium chloride and measured the corrosion inhibitor solidification effect to chloride ion in adopting, used test sample is the cement paste sample of 40 × 40 × 160mm.Cement used is 42.5 grades of Portland cements, and mixing water is 0.5mol/L sodium chloride solution, and it is formulated by analytical pure sodium chloride and pure water, and the mass ratio of cement and sodium chloride solution is 1:0.5.Reinforcing bar used is HPB235, and bar diameter is 10mm, length 100mm.After rebar surface is coated with this product, static 1h, pour into cement paste, and make reinforcing bar be positioned at the position, middle of become test specimen.Form removal after room temperature maintenance 1d, simultaneously by sample as 20 ± 2 DEG C, maintenance 28d in the environment of 95%RH.Then take out test specimen, and the petrifying water mudstone taking rebar surface place carries out chlorine ion concentration mensuration.According to correlation technique in JTJ270-1998 " marine traffic engineering concrete test code ", Water soluble chloride ion amount (CF) is tested, and chloride ion total amount (CT), the method mixing sodium chloride due to this experiment in adopting, is therefore fixed as 8.863mg.g-1.Then curing of chloride ion amount (CB)=CT-CF.Detection sample has five groups, does not respectively mix the blank sample of resistance rust material, fills the detection sample of reinforcing bar resistance rust material in the embodiment one involved by patent of the present invention, embodiment two, embodiment three, embodiment four, and curing of chloride ion concentration test result is as shown in table 2.
The test result of table 2 chloride ion adsorbance
By the result in table it can be seen that the curing of chloride ion amount of reinforcing bar resistance rust material is obviously higher than blank sample in embodiment of the present invention, embodiment two, embodiment three, embodiment four, illustrate that it has good chloride ion solidification effect.
Experiment three, concrete and rebar bond stress is tested: according to 6.8 concrete and rebar bond stress test methods in JTJ270-1998 " marine traffic engineering concrete test code ", the resistance rust material of this patent is carried out performance detection.Detection sample has five groups, does not respectively mix the blank sample of resistance rust material, fills the detection sample of reinforcing bar resistance rust material in the embodiment one involved by patent of the present invention, embodiment two, embodiment three, embodiment four, and test result is as shown in table 3.
Table 3 concrete and rebar bond stress result of the test
| Sample | Blank sample | Embodiment one | Embodiment two | Embodiment three | Embodiment four |
| Bond strength MPa | 11.2 | 11.0 | 10.9 | 10.8 | 11.0 |
From the result in table, in embodiment one of the present invention, embodiment two, embodiment three, embodiment four, concrete and rebar bond stress is in close proximity to blank sample, differing less, this illustrates that the cohesive force between concrete and rebar is had no adverse effects by the resistance rust material of this patent.
Above preferred embodiment of the present invention is described, but is not to be construed as limitations on claims.The present invention is not only limited to above example, and its design parameter allows to change, and all various changes made in the protection domain of demand for independence of the present invention are all in protection scope of the present invention.
Claims (8)
1. the reinforcing bar resistance rust material being applicable to inside concrete, it is characterised in that: described reinforcing bar resistance rust material is to be formed with solid powder mixed preparing by mixing liquid, wherein:
Described mixing liquid is made up of alcohol amine compound, dimethyl compounds and solvent；
Described solid powder is made up of the layered double hydroxide after cement, flyash and calcining.
2. a kind of reinforcing bar suitable in inside concrete according to claim 1 hinders rust material, it is characterised in that: in described reinforcing bar resistance rust material, mixing liquid is 0.6～0.9:1 with solid powder according to mass ratio.
3. a kind of reinforcing bar suitable in inside concrete according to claim 1 hinders rust material, it is characterized in that: in described mixing liquid, the percent mass amount of each component is: alcohol amine compound 20～40%, dimethyl compounds 10～25%, solvent 50～70%；In described solid powder, the percent mass amount of each component is: the layered double hydroxide 60～70% after cement 15～20%, flyash 15～20% and calcining.
4. a kind of reinforcing bar suitable in inside concrete according to claim 1 or 3 hinders rust material, it is characterized in that: described alcohol amine compound is monoethylene glycol amine or diethanolamine or triethanolamine, described dimethyl compounds is dimethylethanolamine, and the purity of described alcohol amine compound and dimethyl compounds is all higher than being equal to 99%.
5. a kind of reinforcing bar suitable in inside concrete according to claim 1 or 3 hinders rust material, it is characterised in that: described solvent is saturated calcium hydroxide aqueous solution.
6. the preparation method that a kind of reinforcing bar suitable in inside concrete according to claim 1 or 3 hinders rust material, it is characterised in that: layered double-metal hydroxide is magnalium carbonate brucite or magnalium nitrate anion brucite.
7. a kind of reinforcing bar suitable in inside concrete according to claim 1 hinders rust material, it is characterised in that: described reinforcing bar resistance rust material is prepared by following steps:
(1) prepared by solid powder: calcined in 3.5～4.5 DEG C/min ramp to the environment of 450～550 DEG C by layered double hydroxide, after constant temperature 4.5～5.5h, naturally cool to room temperature, broken, grinding, sieves, powder after being calcined, then the powder after cement, flyash and calcining is weighed respectively, mixing, obtain solid powder；
(2) prepared by mixed liquor body: weigh alcohol amine compound, dimethyl compounds and solvent respectively, is placed in container by these three kinds of materials, mix homogeneously, obtains mixing liquid；
(3) solid powder that mixing liquid above-mentioned steps (2) prepared prepares with above-mentioned steps (1) mixes, stirring, obtains reinforcing bar resistance rust material.
8. the application of the reinforcing bar resistance rust material being applicable to inside concrete described in claim 1, it is characterised in that: described reinforcing bar resistance rust material is for rebar surface, and during use, thicknesses of layers is 1～2mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106854047A (en) * | 2016-12-21 | 2017-06-16 | 济南轨道交通集团有限公司 | A kind of method for controlling metro stray current corrosion armored concrete |
| CN110145654A (en) * | 2019-04-30 | 2019-08-20 | 卢爽 | Prefabricated heat insulation water transfer pipe road containing the inorganic resistance rust coating of layered double-hydroxide |
| CN112939546A (en) * | 2021-04-01 | 2021-06-11 | 中山大学 | Hydrotalcite-based cement slurry reinforcing steel bar surface targeting protective material and preparation method thereof |
| CN113735539A (en) * | 2021-08-31 | 2021-12-03 | 江苏海能电力设计咨询有限责任公司 | Steel bar rust-resisting coating material, preparation method thereof and steel bar rust-resisting method |
| CN117105561A (en) * | 2023-08-25 | 2023-11-24 | 河南省科学院 | Chloride ion response rust-resistant steel bar surface low-carbon protective material and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106854047A (en) * | 2016-12-21 | 2017-06-16 | 济南轨道交通集团有限公司 | A kind of method for controlling metro stray current corrosion armored concrete |
| CN110145654A (en) * | 2019-04-30 | 2019-08-20 | 卢爽 | Prefabricated heat insulation water transfer pipe road containing the inorganic resistance rust coating of layered double-hydroxide |
| CN112939546A (en) * | 2021-04-01 | 2021-06-11 | 中山大学 | Hydrotalcite-based cement slurry reinforcing steel bar surface targeting protective material and preparation method thereof |
| CN113735539A (en) * | 2021-08-31 | 2021-12-03 | 江苏海能电力设计咨询有限责任公司 | Steel bar rust-resisting coating material, preparation method thereof and steel bar rust-resisting method |
| CN117105561A (en) * | 2023-08-25 | 2023-11-24 | 河南省科学院 | Chloride ion response rust-resistant steel bar surface low-carbon protective material and preparation method thereof |
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