CN113802876A - Repairing method for decorative ultra-high-strength concrete product - Google Patents
Repairing method for decorative ultra-high-strength concrete product Download PDFInfo
- Publication number
- CN113802876A CN113802876A CN202111177425.6A CN202111177425A CN113802876A CN 113802876 A CN113802876 A CN 113802876A CN 202111177425 A CN202111177425 A CN 202111177425A CN 113802876 A CN113802876 A CN 113802876A
- Authority
- CN
- China
- Prior art keywords
- repairing
- parts
- ultra
- strength concrete
- color
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- 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
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- E04G23/0296—Repairing or restoring facades
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a method for repairing a decorative ultrahigh-strength concrete product, which relates to the technical field of building decoration materials, and comprises the steps of cleaning dust and pollutants on the surface of a damaged part, coating an interface material on a to-be-repaired area by using a soft brush, filling an anti-cracking repairing material in the damaged crack, grinding the surface in time by using a pneumatic grinding machine after the to-be-repaired material is initially solidified, covering a wet clean cloth for maintenance, and finally spraying a color treating material to ensure that the surface color of the repaired area is consistent with the color effect of other areas of the product; the repairing method has the characteristics of strong bonding force, high repairing speed, difficult cracking, no repairing trace, lower cost, simple and convenient operation and good durability, and is suitable for quickly and efficiently repairing UHPC products.
Description
The technical field is as follows:
the invention relates to the technical field of building decoration materials, in particular to a repairing method of a decorative ultra-high-strength concrete product.
Background art:
the decorative ultra-high-strength concrete (UHPC) is often applied to exterior wall decoration and decorative curtain walls, and is characterized by large plate area, complex structural modeling and thin product thickness, so that local damage of products is often caused by external forces such as collision and the like in the processes of production demoulding, carrying, packaging and installation, and the overall decorative effect is influenced. The UHPC material is mostly a customized non-standard product, and the damage of a product usually affects the installation progress of the whole project. In addition, in the processing process of the position of the embedded installation sleeve, because the embedded installation sleeve is not well compacted and has a cavity, the drawing force of the embedded sleeve is low, the installation safety of a product is affected, and the embedded installation sleeve also needs to be repaired.
The product with local defects needs to be repaired timely and quickly, the UHPC material has the characteristics of compact structure and low water absorption, common cement and sand are repaired by adding a little polymer stirring mortar, the repairing area is shrunk due to the hardening process of a cement cementing material, and the materials of the repairing material and the repaired area generate interfacial stress, so that the bonding is not firm, the weather resistance is poor, the phenomena of cracking and falling easily occur, meanwhile, the curing time is long, and the repairing efficiency is influenced.
The invention provides a repairing method and a repairing material for a UHPC decorative product, which have strong interface bonding force, fast material curing, high repairing efficiency and convenient construction operation.
The invention content is as follows:
the technical problem to be solved by the invention is to provide a repairing method of a decorative ultra-high-strength concrete product, which has high adhesive force, is quickly cured, is not easy to generate secondary cracking and is naturally connected with the periphery.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a repairing method of a decorative ultra-high-strength concrete product comprises the following steps:
(1) cleaning dust and pollutants on the surface of the damaged part to ensure that the damaged area is clean and dry, and if the damaged area is a crack, grooving along the crack direction;
(2) coating an interface material on the area to be repaired by using a soft brush, and standing for 10-15 min;
(3) filling an anti-cracking repairing material at the damaged crack, and using a mud cutter to repair the damaged area, wherein the repaired area is slightly higher than the UHPC board surface;
(4) after the repairing material is initially solidified, the surface is ground by a pneumatic grinding machine in time, and then the surface is ground by fine sand paper to be smooth and fine and naturally transited with the peripheral area;
(5) covering a wet clean cloth for maintenance, avoiding wind blowing, watering in time and keeping the humidity of the repair area;
(6) and the color treatment material is sprayed, so that the surface color of the repair area is consistent with the color effect of other areas of the product.
The width of the slot in the step (1) is 2-8cm, and the depth is 3-8 cm.
The interface material in the step (2) comprises the following components in parts by weight: 49 parts of nano silica sol, 1 part of silane coupling agent and 50 parts of acrylic emulsion.
The silane coupling agent is preferably a silane coupling agent KH 570.
The nano-silica in the interface material can penetrate into the capillary pores of the cement gel to a depth of about 5mm, and the hydration products Ca (OH) in the gel2The reaction is carried out to generate hydrated calcium silicate gel with strong occupying force, and the strength and the hardness of the cement gel at the interface are improved.
The concentration of the nano-silica sol is 8-10%.
The anti-cracking repairing material in the step (3) comprises the following components in parts by weight: 40-50 parts of white portland cement, 30-45 parts of sand, 3-5 parts of nano silica fume, 1-2 parts of a water-retaining agent, 1-2 parts of a quick drying agent, 1 part of anti-crack fibers and 1 part of a shrinkage reducing agent.
The interface bonding force of the hardened cement product after repair is low, and the main reason is soluble Ca (OH) in products generated by cement hydration reaction2The repairing material and the powdery material with low surface strength have low adhesive force. The nano-silica sol in the interface material belongs to a nano-grade material, has high surface activity,can permeate into capillary pores of cement material and react with powdery hydration products Ca (OH)2The reaction produces a calcium silicate hydrate gel, which is a primary provider of strength in set cement. The quick-drying agent in the anti-cracking repairing material is anhydrous acanthosphere calcium chloride, so that the hardening speed of the repairing material can be quickly increased; the shrinkage reducing agent has the main functions of reducing the surface tension of the liquid in the slurry and reducing the interface bonding force caused by huge stress generated by the volume shrinkage of the repairing material due to the shrinkage of internal capillary pores in the hydration reaction process; the silane coupling agent KH570 can well improve the interfacial adhesion of inorganic materials.
The water-retaining agent is starch ether or cellulose ether. The water-retaining agent can reduce the drying and water loss of the repair material, reduce cracking, improve the thixotropic property of the repair material, ensure convenient operation during repair and reduce the sagging phenomenon.
The sand has the same grain size, grading and type as the sand in the UHPC material.
The quick drying agent is preferably anhydrous acanthosphere calcium chloride powder. Flaky or spherical calcium chloride powder is also acceptable.
The anti-crack fiber is polypropylene fiber (PP) or polyvinyl alcohol (PVA) fiber, the diameter is 100 mu m, and the length is 5-10 mm.
The mesh number of the fine sand paper in the step (4) is 800-1000 meshes.
The color treatment material in the step (6) is a coating material which is prepared by blending inorganic color paste with the color of the aqueous transparent fluorocarbon varnish to make the color of the aqueous transparent fluorocarbon varnish consistent with the surface color of the UHPC product.
The invention has the beneficial effects that: the invention provides a method for repairing a UHPC material, which has the characteristics of strong bonding force, high maintenance speed, difficult cracking, no repairing mark, lower cost, simple and convenient operation and good durability, and is suitable for the rapid and efficient repair of UHPC products.
The specific implementation mode is as follows:
in order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The concentration of the nano-silica sol is 8-10%.
The silane coupling agent is selected from a silane coupling agent KH-570.
The acrylic emulsion is prepared from American Dow chemical APR-968L0, and has a solid content of 45-48%.
The nanometer silica fume is high-whiteness silica fume of Shanghai Tiankai.
The anhydrous acanthosphere calcium chloride powder is selected from Weifang Hai's resource chemical Co.
The shrinkage reducing agent is concrete shrinkage reducing agent of Sanyo chemical Co., Ltd, model number is AS 20.
Example 1: repairing cavity around UHPC pre-embedded sleeve
(1) Dust and pollutants at the cavity defect position around the sleeve are cleaned, and the defect area is ensured to be cleaned and dried.
(2) And coating the prepared interface material on the hollow defect area by using a soft brush, and standing for 10 min. The nano-silica in the interface material permeates into the capillary pores of the cement gel to the depth of 5mm and the hydration product Ca (OH) in the gel2And (3) generating the calcium silicate hydrate gel with strong occupying force, and improving the strength and hardness of the cement gel at the interface.
The interface material comprises the following components in parts by weight: 49 parts of nano silica sol, 1 part of silane coupling agent and 50 parts of acrylic emulsion.
(3) And filling and preparing the stirred anti-cracking repairing material in the hollow position, carefully repairing the damaged area by using a mud knife, wherein the repaired area is slightly higher than the surface of the UHPC board.
The anti-cracking repair material powder comprises the following components in parts by weight: 49 parts of white portland cement, 40 parts of sand, 5 parts of nano silica fume, 2 parts of a water-retaining agent, 2 parts of a quick-drying agent, 1 part of anti-crack polypropylene (PP) fiber and 1 part of a shrinkage reducing agent.
(4) And waiting for 40min, and grinding the surface in time by using a pneumatic grinding machine after the initial setting and solidification of the repairing material. And then, polishing the surface by using 800-mesh fine sand paper until the surface is smooth and fine and is in natural transition with the peripheral area.
(5) And covering with wet clean cloth to avoid wind blowing, watering in time, keeping the humidity of the repair area, and maintaining for 12 h.
(6) And the color treatment material is sprayed to ensure that the color of the surface of the repair area is consistent with the color effect of other areas of the product.
Example 2: repair of UHPC cracks
(1) And (3) slotting along the crack direction by using an electric cutting machine, wherein the width of the slot is 2-8cm, and the depth is 3-8 mm. Cleaning the dust and pollutants on the surface of the repaired part, ensuring the damaged area to be cleaned and dried,
(2) coating interface material on the region to be repaired with a soft brush, and standing for 15 min. The nano-silica in the interface material permeates into the capillary pores of the cement gel to the depth of 5mm and the hydration product Ca (OH) in the gel2And (3) generating the calcium silicate hydrate gel with strong occupying force, and improving the strength and hardness of the cement gel at the interface.
The interface material comprises the following components in parts by weight: 49 parts of nano silica sol, 1 part of silane coupling agent and 50 parts of acrylic emulsion.
(3) And (3) filling and configuring the stirred anti-cracking repairing material in the repairing groove, carefully repairing the damaged area by using a mud knife, wherein the repairing area is slightly higher than the surface of the UHPC board.
The anti-cracking repair material powder comprises the following components in parts by weight: 45 parts of white portland cement, 45 parts of sand, 5 parts of nano silica fume, 2 parts of a water-retaining agent, 1 part of a quick-drying agent, 1 part of anti-crack polyvinyl alcohol fiber and 1 part of a shrinkage reducing agent.
(4) And waiting for 40min, and grinding the surface in time by using a pneumatic grinding machine after the initial setting and solidification of the repairing material. And then, polishing the surface by using 1000-mesh fine sand paper until the surface is smooth and fine and is in natural transition with the peripheral area.
(5) And covering with wet clean cloth to avoid wind blowing, watering in time, keeping the humidity of the repair area, and maintaining for 12 h.
(6) And the color treatment material is sprayed to ensure that the color of the surface of the repair area is consistent with the color effect of other areas of the product.
Example 3: repair of corner damage in UHPC products
(1) Grinding the damaged area by combining an electric cutting machine with a grinding machine to expose the undamaged surface,
and dust and pollutants on the surface are cleaned, and the damaged area is ensured to be cleaned and dried.
(2) Coating interface material on the region to be repaired with a soft brush, and standing for 10-15 min. The nano-silica in the interface material permeates into the capillary pores of the cement gel to the depth of 5mm and the hydration product Ca (OH) in the gel2And (3) generating the calcium silicate hydrate gel with strong occupying force, and improving the strength and hardness of the cement gel at the interface.
The interface material comprises the following components in parts by weight: 49 parts of nano silica sol, 1 part of silane coupling agent and 50 parts of acrylic emulsion.
(3) And filling and preparing the stirred anti-cracking repairing material at the damaged crack, carefully repairing the damaged crack by using a mud knife, and slightly raising the repairing area above the UHPC board surface.
The anti-cracking repair material powder comprises the following components in parts by weight: 44 parts of white Portland cement, 45 parts of sand, 4 parts of nano silica fume, 2 parts of a water-retaining agent, 2 parts of a quick-drying agent, 2 parts of anti-crack polyvinyl alcohol fiber and 1 part of a shrinkage reducing agent.
(4) And waiting for 40min, and grinding the surface in time by using a pneumatic grinding machine after the initial setting and solidification of the repairing material. And then, polishing the surface by using 1000-mesh fine sand paper until the surface is smooth and fine and is in natural transition with the peripheral area.
(5) And covering with wet clean cloth to avoid wind blowing, watering in time, keeping the humidity of the repair area, and maintaining for 12 h.
(6) And the color treatment material is sprayed to ensure that the color of the surface of the repair area is consistent with the color effect of other areas of the product.
Performance index requirements are as follows:
the freeze thawing cycle is 100 times, and the phenomena of falling, peeling and cracking are avoided.
The Mohs hardness of the repaired area reaches 5H after 28 days.
Water absorption/% <1.2
Bulk density>2.3g/cm3
Compressive strength >100MPa
The repairing method of the invention has been successfully used in projects on UHPC curtain walls of the Shanghai Songjiang employee culture center, and the effect is good.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A repairing method for a decorative ultra-high-strength concrete product is characterized by comprising the following steps:
(1) cleaning dust and pollutants on the surface of the damaged part to ensure that the damaged area is clean and dry, and if the damaged area is a crack, grooving along the crack direction;
(2) coating an interface material on the area to be repaired by using a soft brush, and standing for 10-15 min;
(3) filling an anti-cracking repairing material at the damaged crack, and using a mud cutter to repair the damaged area, wherein the repaired area is slightly higher than the UHPC board surface;
(4) after the repairing material is initially solidified, the surface is ground by a pneumatic grinding machine in time, and then the surface is ground by fine sand paper to be smooth and fine and naturally transited with the peripheral area;
(5) covering a wet clean cloth for maintenance, avoiding wind blowing, watering in time and keeping the humidity of the repair area;
(6) and the color treatment material is sprayed, so that the surface color of the repair area is consistent with the color effect of other areas of the product.
2. The method of repairing a decorated ultra-high strength concrete article according to claim 1, wherein: the width of the slot in the step (1) is 2-8cm, and the depth is 3-8 cm.
3. The method of repairing a decorated ultra-high strength concrete article according to claim 1, wherein: the interface material in the step (2) comprises the following components in parts by weight: 49 parts of nano silica sol, 1 part of silane coupling agent and 50 parts of acrylic emulsion.
4. The method of repairing a decorated ultra-high strength concrete article according to claim 3, wherein: the concentration of the nano-silica sol is 8-10%.
5. The method of repairing a decorated ultra-high strength concrete article according to claim 1, wherein: the anti-cracking repairing material in the step (3) comprises the following components in parts by weight: 40-50 parts of white portland cement, 30-45 parts of sand, 3-5 parts of nano silica fume, 1-2 parts of a water-retaining agent, 1-2 parts of a quick drying agent, 1 part of anti-crack fibers and 1 part of a shrinkage reducing agent.
6. The method of repairing a decorated ultra-high strength concrete article according to claim 5, wherein: the water-retaining agent is starch ether or cellulose ether.
7. The method of repairing a decorated ultra-high strength concrete article according to claim 5, wherein: the sand has the same grain size, grading and type as the sand in the UHPC material.
8. The method of repairing a decorated ultra-high strength concrete article according to claim 5, wherein: the quick drying agent is anhydrous acanthosphere calcium chloride powder.
9. The method of repairing a decorated ultra-high strength concrete article according to claim 5, wherein: the anti-crack fiber is polypropylene fiber (PP) or polyvinyl alcohol (PVA) fiber, the diameter is 100 mu m, and the length is 5-10 mm.
10. The method of repairing a decorated ultra-high strength concrete article according to claim 1, wherein: the color treatment material in the step (6) is a coating material which is prepared by blending inorganic color paste with the color of the aqueous transparent fluorocarbon varnish to make the color of the aqueous transparent fluorocarbon varnish consistent with the surface color of the UHPC product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177425.6A CN113802876A (en) | 2021-10-09 | 2021-10-09 | Repairing method for decorative ultra-high-strength concrete product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111177425.6A CN113802876A (en) | 2021-10-09 | 2021-10-09 | Repairing method for decorative ultra-high-strength concrete product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113802876A true CN113802876A (en) | 2021-12-17 |
Family
ID=78897536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111177425.6A Withdrawn CN113802876A (en) | 2021-10-09 | 2021-10-09 | Repairing method for decorative ultra-high-strength concrete product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113802876A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114714488A (en) * | 2022-05-18 | 2022-07-08 | 河南鸿丰新型建材有限公司 | Color difference repairing process for cement product |
-
2021
- 2021-10-09 CN CN202111177425.6A patent/CN113802876A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114714488A (en) * | 2022-05-18 | 2022-07-08 | 河南鸿丰新型建材有限公司 | Color difference repairing process for cement product |
| CN114714488B (en) * | 2022-05-18 | 2023-09-19 | 河南鸿丰建筑科技有限公司 | Color difference repairing process for cement product |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206855716U (en) | Concrete water-saving moist keeping maintenance film | |
| CN101863631A (en) | Stone aggregate wrapped by microfine fibre polymer mortar thin layer and preparation method thereof | |
| CN111018447B (en) | Manufacturing method of high-strength concrete composite material rammed-soil-imitation hanging plate | |
| CN108558324A (en) | A kind of impervious regeneration concrete | |
| CN101812909A (en) | Method for producing anti-pollution flexible real stone face tiles | |
| CN104743988A (en) | Inorganic artificial stone accessories and preparation method thereof | |
| CN113802876A (en) | Repairing method for decorative ultra-high-strength concrete product | |
| CN105601204B (en) | A kind of thin veneering water-proofing material of self-cleaning and its out-hung panel and methods for using them | |
| CN102677853A (en) | Implementation method for renovating by pasting ceramic tile on surface of indoor old ceramic tile | |
| CN110254106A (en) | Use the engraving process of New type sculpture material | |
| CN107035092A (en) | A kind of ultra-high performance concrete Decorative hanging board and its manufacture craft with automatically cleaning photo-catalysis function | |
| CN112479616A (en) | Recycled coarse aggregate wrapped with powder and preparation method thereof | |
| CN109265101A (en) | A kind of solidification formula cement sandwich plate and preparation method thereof | |
| CN101492273A (en) | Method for producing foaming concrete dry powder mortar | |
| CN112456897A (en) | Production process of inorganic terrazzo | |
| CN111943576A (en) | Sponge urban ecological water-permeable pavement brick and preparation method thereof | |
| CN117303819A (en) | Regenerated fan blade fiber reinforced concrete decorative product and preparation method thereof | |
| CN111016031A (en) | Method for manufacturing image raw soil hanging plate | |
| CN110204263A (en) | A kind of production method that building waste is fabricated to brick | |
| CN200975052Y (en) | Paper surface desulfurize gypsum wallboard | |
| CN111908863B (en) | Plastic formwork concrete wall surface plastering mortar and preparation method thereof | |
| CN206917090U (en) | A kind of dry-hang FRP Columns based on fiber colored stone concrete slab | |
| CN201694960U (en) | Stone aggregate wrapped by micro-fiber polymer mortar thin layer | |
| CN113788667A (en) | Magnesium cementing material for hand-pasted glass fiber reinforced plastic mold | |
| CN112321184A (en) | Preparation method of recycled aggregate for prefabricated building |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20211217 |
|
| WW01 | Invention patent application withdrawn after publication |