Concrete defect repairing treatment method

Abstract

The invention relates to the technical field of concrete surface treatment, in particular to a concrete defect repairing treatment method. The method comprises the following steps: specifically repairing after confirming the type of a defect, specifically adjusting the color of the surface of the concrete by adopting a water-based semitransparent adjusting material for a part with chromatic aberration, so that the color tends to the original color of the concrete, reducing the chromatic aberration, and testing the color and the thickness in the process to ensure the best effect and avoid the patch feeling of the traditional covering type repairing; the appearance integrity is obviously improved; according to the crack width, spraying, caulking or grouting processes are dynamically selected, and HK-G epoxy and LW water-soluble polyurethane materials are combined, so that the repairing compactness in different humidity environments is ensured, the anti-permeability is ensured, and the service life of the structure is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of concrete surface treatment, in particular to a method for repairing concrete defects. Background Art

[0002] Concrete is often used for large-scale pouring in modern engineering projects. However, due to the need for manual construction of formwork and the presence of bolts and nuts left behind during the pouring process, some defects are inevitable on the concrete surface, which need to be repaired after pouring. However, existing repair methods still have certain defects. For example, the covering material is difficult to match the original texture and color of the concrete, and obvious color difference is easily formed after repair, affecting the appearance. Summary of the Invention

[0003] The purpose of the present invention is to provide a rationally designed concrete defect repair method to address the defects and shortcomings of the prior art, which can solve the above-mentioned defects.

[0004] To achieve the above object, the present invention adopts the following technical solution: it comprises the following steps:

[0005] S1. Classify and evaluate concrete surface defects, including pitting, honeycombing, exposed rebar, misalignment, cracks, and holes. Remove residual steel bars, wire, screws, and other iron materials that can corrode and cause rust. If the concrete is loose, remove the loose concrete until the fresh aggregate layer is exposed. For honeycombed pitting, either directly smooth it out or chisel it into regular polygons and clean it thoroughly, depending on the depth. For holes and small cracks, use sandpaper to polish them to ensure a smooth surface. For larger misalignments and defects, perform transitional polishing. Use a polisher or sandpaper to polish away attached debris, sand, oil, rust, and dust to ensure a smooth and debris-free construction surface.

[0006] S2. After the above defects are cleaned, use putty of the same material or similar color as the original concrete to make the color uniform;

[0007] S3. After the base is repaired, wait for the repaired area to solidify and inspect the repaired area to determine whether there are obvious appearance quality defects such as poor flatness and color difference. If there are, then fine-tune and adjust the color to repair the defective area. Otherwise, the treatment is completed;

[0008] S4. Fine-tune the defective areas and polish them again with a grinder and sandpaper to remove excess repair material, revealing the original concrete base and keeping the base smooth and flat.

[0009] S5. Apply penetrating silane primer on the dry base surface in two coats, using a roller to evenly apply the primer to ensure full penetration.

[0010] S6. Prepare color adjustment material. Add water-based black, yellow, and red color pastes to the light gray adjustment material to make it close to the original concrete color. According to the actual situation on site, mix it with water in proportion and mix it evenly to make a translucent concrete color adjustment material. Use a felt cloth to pat or a short-hair roller to repair the color difference, retaining the original texture of the concrete. Apply small amounts and multiple times to control the thickness of the adjustment material to reduce the impact of thickness differences on color depth. After the adjustment material dries, use sandpaper to lightly grind it to remove fine particles and enhance the sense of reality.

[0011] S7. After the color difference adjustment material is completely dry, apply 1-2 coats of silicone resin topcoat, using a roller to evenly apply the paint to ensure that there is no missing paint.

[0012] S8. Crack repair: Monitor crack width and clean with a wire brush and acetone. After drying, select a repair method based on crack width. For cracks less than 0.1mm in width, apply epoxy resin spraying at least twice. For cracks 0.1mm to 0.2mm in width, chisel triangular grooves along the left and right sides of the crack and fill with high-strength, slightly expansive cement mortar. For cracks greater than 0.2mm in width, arrange saddle holes based on depth. For cracks less than 100cm in depth, add inclined grouting holes for those greater than 100cm. After cleaning, use chemical grouting materials for grouting.

[0013] S9. For the holes after the cone nuts are removed, clean them and remove the loose concrete inside. Fill them with repair mortar in layers. Reserve 20mm depth for the first filling. Use hard plastic board for positioning during the second filling and stick transparent tape on the surface to prevent cracking.

[0014] Preferably, in step S6, after the adjustment material is prepared, a small brush is used to perform a small-scale multi-point trial coating on the edge to be repaired, and the remaining adjustment material is sealed. After the trial coating area is dried, the color difference between the original concrete surface and the adjustment material is observed, and the color of the adjustment material is adaptively adjusted to reduce the color difference caused by the different humidity of the adjustment material. The number of coating layers with the best effect is tested by stacking coating.

[0015] Preferably, in step S1, the regular polygon is a quadrilateral, and the chiseling depth is such that the loose concrete is completely removed.

[0016] Preferably, in step S6, the construction direction of the color difference adjusting material is staggered with the original texture direction of the concrete.

[0017] Preferably, in step S8, the chemical grouting material is HK-G epoxy resin or LW water-soluble polyurethane, and the grouting sequence is grouting hole by hole from the bottom end of the crack to the top end.

[0018] Preferably, in step S9, during the layered filling process, a micro-expansion agent is added to the repair mortar, and a regular circular edge is formed on the surface after filling.

[0019] Preferably, in step S5, the interval between coatings of the penetrating silane primer is not less than 1 hour, and the base surface is ensured to be completely wetted during the second coating.

[0020] Preferably, in step S7, the silicone resin topcoat is applied after the conditioning material has dried for at least 3 hours.

[0021] Preferably, step S1 further includes: repairing defects at the template joints with a special putty for plain concrete to minimize the repair area.

[0022] After adopting the above structure, the beneficial effects of the present invention are:

[0023] 1. The present invention uses translucent color adjustment materials and manual coating technology to achieve a high degree of consistency between the texture and color of the repaired area and the original concrete, avoiding the "patch feeling" of traditional covering repairs and significantly improving the overall appearance.

[0024] 2. The present invention dynamically selects spraying, caulking or grouting processes according to the crack width, combines HK-G epoxy and LW water-soluble polyurethane materials to ensure the repair density under different humidity environments, guarantee impermeability, and extend the service life of the structure.

[0025] 3. The present invention adopts layered filling and hard plastic plate positioning for the holes of the truncated cone nut, which reduces the risk of mortar collapse and avoids rework; the color adjustment material adopts the "small amount and multiple times" construction principle to reduce material waste and shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall repair process of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] It includes the following steps:

[0029] S1. Classify and evaluate concrete surface defects, including pitting, honeycomb, exposed reinforcement, misalignment, cracks, and holes. Remove residual steel bars, wires, screws, and other iron materials that can corrode and cause rust. If the concrete is loose, remove the loose concrete until the fresh aggregate layer is exposed. For honeycomb pitting, choose to directly smooth it out or chisel it into regular polygons based on the depth, and then clean and moisten it. For holes and small cracks, use sandpaper to polish them to ensure the surface is flat, the regular polygons are quadrilaterals, and the chiseling depth is sufficient to completely remove the loose concrete. For larger misalignments and defects, perform transitional polishing and use a polishing machine or sandpaper to polish away attached debris, soil, sand, oil, rust, and dust to ensure the construction surface is flat and free of debris. Use a special putty for plain concrete to repair defects in formwork joints, minimizing the repair area.

[0030] S2. After the above defects are cleaned, use putty of the same material or similar color as the original concrete to make the color uniform;

[0031] S3. After the base is repaired, the repaired area is cured and inspected to determine whether there are obvious appearance quality defects such as poor flatness and color difference. If there are, the defective area is refined and the color is adjusted for repair. Otherwise, the treatment is completed;

[0032] S4. Fine-tune the defective areas and polish them again with a grinder and sandpaper to remove excess repair material, revealing the original concrete base and keeping the base smooth and flat.

[0033] S5. Apply penetrating silane primer on the dry base surface in two coats. Use a roller to evenly roll the primer to ensure that the primer fully penetrates. The interval between the two coats should be no less than 1 hour. When applying the second coat, ensure that the base surface is completely wet. The dosage is 0.15kg / ㎡. Before painting, ensure that the base surface moisture content is below 10% and the pH value is below 10.

[0034] S6. Prepare color difference adjustment materials. Add water-based black, yellow, and red color pastes to the light gray adjustment materials and mix them to make them close to the original concrete color. According to the actual situation on site, mix with water in proportion and mix evenly to make translucent concrete color difference adjustment materials. Use a small brush to conduct a small-scale multi-point trial coating on the edge to be repaired. Seal the remaining adjustment materials. After the trial coating area is dry, observe the color difference with the original concrete surface and adjust the color of the adjustment material adaptively to reduce the color difference caused by the different humidity of the adjustment material. Test the number of coating layers for the best effect through overlapping coating. Repair the color difference by patting with felt cloth or rolling with a short-haired roller. The construction direction of the color difference adjustment material is staggered with the original texture direction of the concrete to retain the original texture of the concrete. Apply small amounts and multiple times to control the thickness of the adjustment material and reduce the impact of the thickness difference on the color depth. After the adjustment material is dry, use sandpaper to lightly grind the adjustment material to remove fine particles, thereby enhancing the sense of reality.

[0035] S7. After the color difference adjustment material is completely dry, and the interval time is not less than three hours, apply 1-2 coats of silicone resin topcoat, using a roller to evenly roll the paint to ensure that there is no missing paint. The coating amount is 0.08kg / ㎡;

[0036] S8. Crack repair: Monitor the crack width and clean it with a wire brush and acetone. After drying, choose a repair method based on the crack width. For cracks less than 0.1mm in width, use epoxy resin spraying, and apply it at least twice. For cracks 0.1mm to 0.2mm in width, chisel triangular grooves along the left and right sides of the crack and fill them with high-strength, slightly expansive cement mortar. For cracks greater than 0.2mm in width, arrange cross-crack holes based on the depth. For cracks less than 100cm in depth, add inclined grouting holes for those greater than 100cm. After cleaning the holes, use chemical grouting materials such as HK-G epoxy resin or LW water-soluble polyurethane. Grouting should be done hole by hole from the bottom of the crack to the top. Reserve 20mm for the first filling. Use hard plastic board for positioning during the second filling, and apply transparent tape to the surface to prevent cracking.

[0037] S9. For the holes after the cone nuts are removed, clean them, remove the loose concrete in the holes, and fill them with repair mortar in layers. Add micro-expansion agent to the repair mortar, and form regular circular edges on the surface after filling.

[0038] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all changes and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A method for repairing concrete defects, characterized by: The steps include: S1. Classify and evaluate concrete surface defects, clean, polish and fill defective areas as needed; S2. After the above defects are cleaned, use putty of the same material or similar color as the original concrete to make the repaired color consistent; S3. After the base is repaired, the repaired area is cured and inspected to determine whether there are any appearance quality defects such as poor flatness and color difference. If so, the defective area is refined and the color is adjusted for repair. Otherwise, the treatment is completed. S4. Fine-tune the defective areas and polish them again with a grinder and sandpaper to remove excess repair material, revealing the original concrete base and keeping the base smooth and flat. S5. Apply penetrating silane primer on the dry base surface in two coats, using a roller to evenly apply the primer to ensure full penetration. S6. Prepare color adjustment material. Add water-based black, yellow, and red color pastes to the light gray adjustment material to make it close to the original concrete color. According to the actual situation on site, mix it with water in proportion and mix it evenly to make a translucent concrete color adjustment material. Use a felt cloth to pat or a short-hair roller to repair the color difference and retain the original texture of the concrete. After the adjustment material dries, use sandpaper to lightly grind it to remove fine particles and enhance the sense of reality. S7. After the color difference adjustment material is completely dry, apply 1-2 coats of silicone resin topcoat, using a roller to evenly apply the paint to ensure that there is no missing paint. S8. Crack repair: Monitor crack width and clean with a wire brush and acetone. After drying, select a repair method based on crack width. For cracks less than 0.1mm in width, apply epoxy resin spraying at least twice. For cracks 0.1mm to 0.2mm in width, chisel triangular grooves along the left and right sides of the crack and fill with high-strength, slightly expansive cement mortar. For cracks greater than 0.2mm in width, arrange saddle holes based on depth. For cracks less than 100cm in depth, add inclined grouting holes for those greater than 100cm. After cleaning, use chemical grouting materials for grouting. S9. For the holes after the cone nuts are removed, clean them and remove the loose concrete inside. Fill them with repair mortar in layers. Reserve 20mm depth for the first filling. Use hard plastic board for positioning during the second filling and stick transparent tape on the surface to prevent cracking.

2. The concrete defect repair method according to claim 1, characterized in that: In S1, the types of surface roughness, honeycomb, exposed reinforcement, misalignment, cracks, and holes are evaluated. Then, the iron materials remaining on the concrete surface that may cause rust and rust spots are removed. If the concrete is loose, the loose concrete is removed until the fresh aggregate layer is exposed. For honeycomb surface roughness, the surface is either directly smoothed or chiseled into regular polygons and then cleaned and moistened according to the depth. For holes and cracks of small width, use sandpaper to polish them to ensure the surface is smooth. For larger misalignments and defects, perform transitional polishing. Use a polishing machine or sandpaper to polish away attached debris, soil, sand, oil, rust, and dust to ensure that the construction surface is flat and free of debris.

3. The concrete defect repair method according to claim 1, characterized in that: In step S6, after the adjustment material is prepared, a small brush is used to perform a trial coating on a small area at multiple points on the edge to be repaired. The remaining adjustment material is sealed. After the trial coating area is dried, the color difference between the original concrete surface and the adjustment material is observed. The color of the adjustment material is adaptively adjusted to reduce the color difference caused by the different humidity of the adjustment material. The number of coating layers with the best effect is tested by layering.

4. The method for repairing concrete defects according to claim 1, wherein: In step S1, the regular polygon is a quadrilateral, and the chiseling depth is such that the loose concrete is completely removed.

5. The concrete defect repair method according to claim 1, characterized in that: In step S6, the construction direction of the color difference adjusting material is staggered with the original texture direction of the concrete.

6. The method for repairing concrete defects according to claim 1, characterized in that: In step S8, the chemical grouting material is HK-G epoxy resin or LW water-soluble polyurethane, and the grouting sequence is grouting hole by hole from the bottom of the crack to the top.

7. The method for repairing concrete defects according to claim 1, wherein: In step S9, during the layered filling process, a micro-expansion agent is added to the repair mortar, and a regular circular edge is formed on the surface after filling.

8. The method for repairing concrete defects according to claim 1, wherein: In step S5, the interval between coatings of the penetrating silane primer is not less than 1 hour, and the base surface is ensured to be completely wetted during the second coating.

9. The method for repairing concrete defects according to claim 1, wherein: In step S7, the silicone resin topcoat should be applied after the conditioning material has dried for at least 3 hours.

10. The concrete defect repair method according to claim 1, characterized in that: Step S1 also includes: repairing defects at the template joints with a special putty for plain concrete to minimize the repair area.

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