CN107327156B - Concrete surface treatment method before coating protective coating - Google Patents
Concrete surface treatment method before coating protective coating Download PDFInfo
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- CN107327156B CN107327156B CN201710735291.2A CN201710735291A CN107327156B CN 107327156 B CN107327156 B CN 107327156B CN 201710735291 A CN201710735291 A CN 201710735291A CN 107327156 B CN107327156 B CN 107327156B
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- concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
A concrete surface treatment method before coating protective coating comprises the following steps: (1) pouring concrete, and maintaining for at least 28 days; (2) cutting off the exposed reinforcement bar head, chiseling a hole with the width not less than twice the diameter of the reinforcement bar into the concrete, and filling a repairing material into the hole; (3) repairing cracks, removing the hollow parts, exposing the hollow parts, and filling the hollow parts with filling materials matched with concrete; (4) selecting different repairing materials for repairing holes with different repairing thicknesses; (5) carrying out surface flatness treatment; (6) and (4) cleaning the surface. The method is simple to operate, and the treated concrete surface layer is high in strength, corrosion-resistant, clean and flat and is easy to coat a protective coating.
Description
Technical Field
The invention relates to a concrete surface treatment method before coating a protective coating, belonging to the technical field of concrete surfaces.
Background
The protective performance of the concrete protective coating is directly related to whether the concrete surface treatment is proper or not, the reasonable and standard concrete surface treatment can ensure that the protective coating can exert the best performance to protect the concrete against corrosion, and the improper and irregular concrete surface treatment can cause the protective coating to fail prematurely, so that the concrete is seriously corroded. For the above reasons, proper surface treatment and inspection of concrete is required to ensure that the protective coating effectively protects the concrete. However, no effective concrete surface treatment exists at present, so that the concrete coated with the protective coating is easy to fall off, corrode and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a concrete surface treatment method before coating a protective coating, and aims to solve the problems that the existing concrete protective coating is easy to fall off and corrode.
The technical scheme for solving the technical problems is as follows: a concrete surface treatment method before coating protective coating comprises the following steps:
(1) pouring concrete, and maintaining for at least 28 days;
(2) cutting off the exposed reinforcement bar head, chiseling a hole with the width not less than twice the diameter of the reinforcement bar into the concrete, and filling a repairing material into the hole;
(3) repairing cracks, removing the hollow parts, exposing the hollow parts, and filling the hollow parts with filling materials matched with concrete;
(4) selecting different repairing materials for repairing holes with different repairing thicknesses;
(5) carrying out surface flatness treatment;
(6) and (4) cleaning the surface.
By adopting the technical scheme, the concrete is fully cured within a proper time; chiseling a hole with the width not less than twice the diameter of the steel bar into the concrete, ensuring that the repairing material is firmly combined with the concrete and the steel bar, is not easy to fall off, and protecting the steel bar head; repairing cracks, hollows and holes, and repairing the defects of the concrete surface layer completely, so that the concrete surface layer is solid and seamless, and the integral strength of the concrete is ensured; after the surface flatness treatment and cleaning are carried out, the surface of the concrete is uniform and flat and has no impurities, the coating of a protective coating is easy to carry out, and a uniform paint film is obtained. The method is simple to operate, and the treated concrete surface layer is high in strength, corrosion-resistant, clean and flat and is easy to coat a protective coating.
The invention is further provided that the construction conditions in the step (1) are as follows: under the condition of ventilation, the temperature is 23-26 ℃, and the humidity is 45-55%.
Through above-mentioned technical scheme, keep sufficient moisture and temperature for the concrete curing is abundant, prevents to produce rough surface.
The invention further provides that the repairing material in the step (2) is solvent-free epoxy mortar or polymer cement mortar.
By the technical scheme, the solvent-free epoxy mortar or polymer cement mortar has high strength and excellent filling and hole repairing capacity, and can quickly repair holes on the surfaces of metal and concrete.
The invention is further configured that, in the step (3), the specific way of repairing the crack is as follows: the static cracks are filled by high-strength epoxy mortar, and the dynamic cracks are filled by chemical-resistant elastic materials and glass fiber cloth.
Through the technical scheme, the material used for the dynamic cracks has certain elasticity, so that the dynamic cracks are not broken or fall off under external force or vibration. Polymeric elastic materials, such as elastomeric polyurethanes, that have some chemical resistance.
The invention is further configured that the filling material in step (3) is solvent-free epoxy mortar, polymer cement mortar or elastic polyurethane.
Through the technical scheme, the hollow drum can be completely, tightly and firmly filled.
The invention is further configured such that when the solventless epoxy mortar is used, the concrete surface is roughened first.
Through the technical scheme, the contact area between the concrete surface and the solvent-free epoxy mortar is increased roughly, the bonding force is increased, and the bonding is firmer.
The invention is further configured that in the step (4), when the thickness of the hole is less than 1.6mm, polymer mortar or polymer cement mortar is used; when the thickness of the holes is more than 1.6mm and less than 25mm, polymer cement mortar, aluminate cement mortar or silicate cement mortar is used; when the thickness of the holes is more than 25mm, aluminate cement mortar or silicate cement mortar is used.
By the technical scheme, the silicate or aluminate cement concrete is used for thick-layer repair, and has good filling performance, high strength and relatively low price; the polymer cement mortar or silicate mortar or aluminate cement mortar for repairing the thin layer has good binding force with concrete when the thin layer is formed, high strength of the thin layer and quick drying.
The invention is further set that when the silicate cement mortar is used for repairing, the grade of the silicate cement is higher than that of the concrete, and the silicate cement needs to be maintained for more than 28 days after repairing; when the aluminate cement mortar is used for repairing, the maintenance is required for more than 2 days.
The invention is further configured that in step (5), the surface flatness treatment is performed by shot blasting, dry sand blasting or wet sand blasting.
The invention is further provided that the construction conditions in steps (2), (3) and (4) are as follows: the relative humidity is less than or equal to 85 percent, the dew point temperature is higher than the substrate temperature by more than 3 ℃, and the wind speed is less than 5 m/s. And due to proper temperature, humidity and ventilation, the concrete has higher strength, impermeability and durability.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A concrete surface treatment method before coating protective coating comprises the following steps:
(1) under the ventilation condition, the temperature is 23-26 ℃, the humidity is 45-55%, concrete is poured, and the concrete is maintained for at least 28 days; the relative humidity, the dew point and the ambient temperature can be measured by a hand-operated dry-wet thermometer, and the relative humidity, the dew point and the ambient temperature are as close as possible to the surface to be constructed during measurement so as to acquire accurate data.
(2) Cutting off the exposed reinforcing steel bar head, chiseling a hole with the width not less than two times of the diameter of the reinforcing steel bar into the concrete, wherein the depth of the reinforcing steel bar hole is not less than 18 mm, and filling solvent-free epoxy mortar or polymer cement mortar into the hole for repairing.
(3) For cracks: the static cracks are filled with high-strength epoxy mortar, the dynamic cracks are filled with chemical-resistant elastic materials and glass fiber cloth, and during operation, the chemical-resistant elastic materials are coated firstly, then the glass fiber cloth is coated, and finally a layer of the chemical-resistant elastic materials is coated.
For empty drum: and removing the hollow part to expose the hollow, and filling the hollow with solvent-free epoxy mortar, polymer cement mortar or elastic polyurethane. When the solvent-free epoxy mortar is used, the surface of the concrete needs to be roughened as coarse as possible.
(4) Selecting different repairing materials for repairing holes with different repairing thicknesses;
when the thickness of the hole is less than 1.6mm, polymer mortar or polymer cement mortar is used; when the thickness of the holes is more than 1.6mm and less than 25mm, polymer cement mortar, aluminate cement mortar or silicate cement mortar is used; when the thickness of the holes is more than 25mm, aluminate cement mortar or silicate cement mortar is used.
When the silicate cement mortar is used for repairing, the grade of the silicate cement is higher than that of concrete, and the silicate cement needs to be maintained for more than 28 days after being repaired; when the aluminate cement mortar is used for repairing, the maintenance is required for more than 2 days.
The construction conditions in the steps (2), (3) and (4) are as follows: the relative humidity is less than or equal to 85 percent, the dew point temperature is higher than the substrate temperature by more than 3 ℃, and the wind speed is less than 5 m/s;
(5) carrying out surface flatness treatment; the surface evenness can be processed by adopting shot blasting, dry sand blasting or wet sand blasting;
(6) cleaning the surface; after the sand blasting treatment, the sand blasting abrasive is cleaned firstly, and then the surfaces are cleaned by modes of a broom, an industrial dust collector, compressed air blowing, water washing and the like, so that all surfaces of the concrete are cleaned without impurities such as laitance, a curing agent, a release agent, weathering products, grease, oil, dust and the like, and the compressed air blowing does not contain oil stain and moisture.
The heavy grease needs to be removed and the remaining grease can be cleaned with alkaline detergent or steam. The simple use of solvent cleaning may allow grease to penetrate deep into the inner layer of the concrete.
The following table shows the inspection and evaluation of the concrete surface after the surface treatment:
after surface treatment, the surface of the concrete has high tensile strength, proper roughness, clean surface, no pollutant residue, proper moisture content and proper pH value. Thus, the concrete is better prepared for the subsequent application of the protective coating.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A concrete surface treatment method before coating a protective coating is characterized by comprising the following steps:
(1) pouring concrete, and maintaining for at least 28 days;
(2) cutting off the exposed reinforcement heads, chiseling reinforcement holes with the width not less than twice the diameter of the reinforcements into the concrete, wherein the depth of the reinforcement holes is not less than 18 mm, and filling repair materials into the reinforcement holes;
(3) repairing cracks, removing the hollow parts, exposing the hollow parts, and filling the hollow parts with filling materials matched with concrete;
(4) selecting different repairing materials for repairing holes with different repairing thicknesses;
(5) carrying out surface flatness treatment;
(6) and (4) cleaning the surface.
2. The concrete surface treatment method before coating the protective coating according to claim 1, characterized in that the construction conditions in the step (1) are as follows: under the condition of ventilation, the temperature is 23-26 ℃, and the humidity is 45-55%.
3. The method for treating the surface of concrete before being coated with a protective coating according to claim 1, wherein the repairing material in the step (2) is solvent-free epoxy mortar or polymer cement mortar.
4. The concrete surface treatment method before coating the protective coating according to claim 1, wherein in the step (3), the concrete way of repairing the crack is as follows: the static cracks are filled by high-strength epoxy mortar, and the dynamic cracks are filled by chemical-resistant elastic materials and glass fiber cloth.
5. The method for treating the surface of the concrete before being coated with the protective coating according to claim 1, wherein the filling material in the step (3) is solvent-free epoxy mortar, polymer cement mortar or elastic polyurethane.
6. The method as claimed in claim 5, wherein the epoxy mortar is used without solvent, and the surface of the concrete is roughened by roughening.
7. The method for treating the surface of concrete before coating with a protective coating according to claim 1, wherein in the step (4), when the thickness of the hole is less than 1.6mm, polymer mortar or polymer cement mortar is used; when the thickness of the holes is more than 1.6mm and less than 25mm, polymer cement mortar, aluminate cement mortar or silicate cement mortar is used; when the thickness of the holes is more than 25mm, aluminate cement mortar or silicate cement mortar is used.
8. The method for treating the surface of the concrete before coating the protective coating according to claim 7, wherein when the portland cement mortar is used for repairing, the mark of the portland cement is higher than that of the concrete, and the concrete is maintained for more than 28 days after repairing; when the aluminate cement mortar is used for repairing, the maintenance is required for more than 2 days.
9. The method for treating the surface of concrete before being coated with the protective coating according to claim 1, wherein in the step (5), the surface flatness treatment is performed by means of shot blasting, dry sand blasting or wet sand blasting.
10. The concrete surface treatment method before coating the protective coating according to claim 1, characterized in that the construction conditions in the steps (2), (3) and (4) are as follows: the relative humidity is less than or equal to 85 percent, the dew point temperature is higher than the substrate temperature by more than 3 ℃, and the wind speed is less than 5 m/s.
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| CN201710735291.2A CN107327156B (en) | 2017-08-24 | 2017-08-24 | Concrete surface treatment method before coating protective coating |
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| CN107327156B true CN107327156B (en) | 2020-05-19 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222532B (en) * | 2017-12-29 | 2020-04-10 | 上海住总集团建设发展有限公司 | Method for cleaning rubble facade of historical building |
| CN110116451B (en) * | 2019-04-03 | 2020-11-13 | 山东京博环保材料有限公司 | Concrete surface treatment process |
| CN111155662A (en) * | 2020-01-06 | 2020-05-15 | 江苏大学 | Concrete surface corrosion prevention method and large-scale pump station |
| CN111946091A (en) * | 2020-08-26 | 2020-11-17 | 华侨大学 | Reinforcing method for improving seismic performance of masonry wall |
| CN113431360A (en) * | 2021-05-28 | 2021-09-24 | 北京市第三建筑工程有限公司 | Construction method for repairing cracks of bare concrete wall |
| CN114541800A (en) * | 2022-03-04 | 2022-05-27 | 安徽富煌建筑科技有限公司 | Hollowing repair process for prefabricated filling wallboard hole |
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| CN1381659A (en) * | 2001-04-14 | 2002-11-27 | 廖石泉 | Technology for treating water leakage of external wall with facing bricks |
| CN101550266A (en) * | 2009-03-12 | 2009-10-07 | 北京聚合筋建筑修复技术中心 | Method for preparing and using foaming epoxy resin base grouting material for treating concrete floor empty drum |
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