CN116335430A - Building crack repairing method - Google Patents
Building crack repairing method Download PDFInfo
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- CN116335430A CN116335430A CN202310314930.3A CN202310314930A CN116335430A CN 116335430 A CN116335430 A CN 116335430A CN 202310314930 A CN202310314930 A CN 202310314930A CN 116335430 A CN116335430 A CN 116335430A
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- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000758 substrate Substances 0.000 claims abstract description 17
- 238000013329 compounding Methods 0.000 claims abstract description 16
- 239000002344 surface layer Substances 0.000 claims abstract description 15
- 238000007790 scraping Methods 0.000 claims abstract description 12
- 239000000839 emulsion Substances 0.000 claims abstract description 11
- 229920002689 polyvinyl acetate Polymers 0.000 claims abstract description 11
- 239000011118 polyvinyl acetate Substances 0.000 claims abstract description 11
- 239000003469 silicate cement Substances 0.000 claims abstract description 11
- 238000004140 cleaning Methods 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims description 74
- 229920000728 polyester Polymers 0.000 claims description 65
- 239000002131 composite material Substances 0.000 claims description 45
- 239000012790 adhesive layer Substances 0.000 claims description 39
- 229920000742 Cotton Polymers 0.000 claims description 37
- 229920003023 plastic Polymers 0.000 claims description 35
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- 238000010276 construction Methods 0.000 claims description 28
- 239000004831 Hot glue Substances 0.000 claims description 24
- 239000000872 buffer Substances 0.000 claims description 21
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- 239000003513 alkali Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 21
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/34—Filling pastes
-
- 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
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Working Measures On Existing Buildindgs (AREA)
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Abstract
The application relates to the technical field of building construction, and discloses a building crack repairing method which sequentially comprises the following steps: cleaning a substrate, coating a substrate curing layer, scraping a leveling layer, coating the leveling curing layer, compounding an anti-cracking layer, compounding a reinforcing layer, scraping an outer surface layer and polishing; wherein the leveling layer scraping batch adopts a material as a modulation putty; the prepared putty comprises a first mixture and a second mixture, wherein the mass ratio of the first mixture to the second mixture is 1:3; the first mixture comprises polyvinyl acetate emulsion and clear water, and the mass ratio of the polyvinyl acetate emulsion to the clear water is 1:3; the second mixture comprises putty and white silicate cement for indoor use, and the mass ratio of the putty to the white silicate cement for indoor use is 3:1. The crack-resistant effect of crack repair can be improved and the service life of repair crack resistance can be prolonged by the building crack repair method.
Description
Technical Field
The application relates to the technical field of building construction, in particular to a building crack repairing method.
Background
Cracks of different degrees frequently appear in a building structure, and although some cracks do not reach the dangerous degree of collapsing the building, the cracks of the structure can cause leakage, corrosion, concrete carbonization and the like, thereby causing the durability of building components to be reduced, and even causing serious potential threat to the safety and reliability of the structure. Therefore, repair treatment should be timely adopted for the building cracks, and hidden danger caused by the cracks is reduced.
In the building crack repairing method, a surface covering repairing method is generally adopted for a crack, namely, cement paste or epoxy cement is smeared on the surface of the crack for plugging, and after the cement paste or the epoxy cement is solidified and plugged, a formed plugging part is hard connection, and when the repaired crack releases stress due to expansion and contraction or external force, the plugging part is easy to tear and split, namely, the repaired crack resistance is poor. Therefore, the polyester glass fiber cloth is usually stuck at the crack when the building crack is repaired, and the polyester glass fiber cloth is a mixture of glass fiber and polyester, has the strength of glass fiber and the flexibility of polyester fiber, and can improve the cracking resistance of the repaired crack. However, when the polyester glass fiber cloth is pasted, the surface cleaning is needed to be carried out on the crack, the base layer is smeared and leveled on the crack after cleaning, and then the polyester glass fiber cloth is pasted, wherein putty powder is used as a material for smearing and leveling the base layer, the chalking phenomenon is easy to occur in putty, the surface structural stability of a putty leveling layer is reduced, and the connection strength between the polyester glass fiber cloth and a building is greatly reduced, so that the anti-cracking effect is reduced.
Disclosure of Invention
In order to improve the crack resistance effect of crack repair and prolong the service life of repairing crack resistance, the application provides a building crack repair method.
The application provides a building crack repairing method, which adopts the following technical scheme:
the building crack repairing method sequentially comprises the following steps: cleaning a substrate, coating a substrate curing layer, scraping a leveling layer, coating the leveling curing layer, compounding an anti-cracking layer, compounding a reinforcing layer, scraping an outer surface layer and polishing; wherein the leveling layer scraping batch adopts a material as a modulation putty; the prepared putty comprises a first mixture and a second mixture, wherein the mass ratio of the first mixture to the second mixture is 1:3; the first mixture comprises polyvinyl acetate emulsion and clear water, and the mass ratio of the polyvinyl acetate emulsion to the clear water is 1:3; the second mixture comprises putty and white silicate cement for indoor use, and the mass ratio of the putty to the white silicate cement for indoor use is 3:1.
Through the technical scheme, before the leveling layer is scraped, the substrate is cleaned and solidified, so that the compactness of the surface of the substrate can be improved, the interface adhesive force is improved, the bonding strength between the leveling layer putty and the substrate is improved, the possibility of empty drum is reduced, the falling-off phenomenon of the leveling layer putty due to the empty drum is reduced, the anti-cracking stability of an anti-cracking layer on the leveling layer is improved, and the repairing anti-cracking service life is prolonged. The prepared putty for the leveling layer scraping is special putty, is prepared by mixing white silicate cement, indoor putty, polyvinyl acetate emulsion, water and the like, a crosslinking system is established between the indoor putty and the white silicate cement through the polyvinyl acetate emulsion, the three are coordinated, the compatibility between molecules is high, the bonding strength and the adhesiveness of the putty are improved, the powder removal phenomenon is reduced, the cracking phenomenon caused by the overhigh curing hardness of the leveling layer is also reduced, the composite stability between the leveling layer and the cracking layer is improved, the cracking effect of crack repair is improved, and the repair cracking service life is prolonged. And the leveling solidification layer coating can be carried out after the leveling layer is scraped, the solidifying agent of the leveling solidification layer can penetrate deep into the leveling layer, the compactness of the leveling layer is improved, the chalking phenomenon of the leveling layer is further reduced, the surface adhesive force of the leveling layer is improved, and the composite stability between the leveling layer and the anti-cracking layer is improved.
Optionally, the crack resistant layer includes an elastic layer and a plastic layer, the elastic layer being located between the leveling cure layer and the plastic layer.
In the application, the anti-cracking layer adopts a double-layer structure of the elastic layer and the plastic layer, in the cracking process, the cracking stress is fed back to the plastic layer through the elastic layer, the elastic layer disperses the cracking stress, the direct impact of the cracking stress on the plastic layer is weakened, the cracking possibility of the plastic layer is reduced, and the cracking phenomenon of the outer surface of the plastic layer after the crack is repaired is reduced. And simultaneously, the elasticity of the plastic layer is smaller than that of the elastic layer, the plastic layer can carry out moulding limit assistance on the elastic layer, the stress of the elastic layer is dispersed, and the phenomenon that the elastic dispersion effect of the elastic layer is reduced due to excessive deformation is reduced. The cracking effect of the cracking layer is improved, and the service life of the cracking layer is prolonged.
Optionally, the elastic layer is polyester full-lining elastic cloth.
The elastic fabric is elastic grey fabric, and the grey fabric has larger elasticity through rib textures. The full-lining elastic terylene cloth has the characteristics of higher elasticity, high strength, high impact strength, wear resistance and corrosion resistance, so that the full-lining elastic terylene cloth not only can effectively disperse cracking stress of cracks, but also is convenient to construct and is not easily influenced by construction environmental factors.
Optionally, the plastic layer is polyester cotton cloth.
The polyester cotton cloth is a polyester cotton blended fabric, is a textile woven by using 65% -67% of polyester and 33% -35% of cotton blended yarn as main components, and has the advantages of high fiber strength, stable size, good wear resistance, flat cloth cover and convenience for composite application. In addition, in the construction process of the building crack repairing method, the reinforcing layer is compounded on the polyester cotton cloth, after the putty is adopted for coating during the compounding of the reinforcing layer, the reinforcing layer is laminated into the putty layer, and the reinforcing layer is compounded after the putty layer is dried, in the process, as polyester fibers belong to hydrophobic fibers, the polyester cotton cloth has weak water absorption, the water absorption rate of the polyester cotton cloth to the putty layer coated on the polyester cotton cloth is low, the drying speed of the putty layer can be reduced, the water volatilization speed of the putty layer is reduced, the surface layer of the putty layer can be cured with sufficient water, the powder removal phenomenon of the putty surface layer caused by low water loss curing effect is reduced, the compound stability of the reinforcing layer positioned on the polyester cotton cloth (anti-crack layer) can be improved, the anti-crack reinforcing effect is improved, the stability of a crack repairing structure is improved, and the crack repairing effect is improved.
Optionally, a buffer layer is further coated between the elastic layer and the leveling solidification layer.
Through the technical scheme, in the cracking process, the cracking stress suddenly generated can be fed back to the elastic layer through the buffer layer, the buffer layer buffers the sudden release of the cracking stress, the direct impact of the cracking stress on the elastic layer is reduced, the possibility of excessive deformation of the elastic layer is reduced, the cracking effect is improved, and the cracking service life is prolonged.
Optionally, the slowThe punching layer is a hot melt adhesive layer, and the coating weight of the hot melt adhesive layer is 140g/m 2 -160g/m 2 。
Through the technical scheme, the hot melt adhesive layer is positioned between the elastic layer and the leveling solidification layer in the form of a full coating, and the buffer effect is effectively achieved. It should be noted that the requirement on the coating amount of the hot melt adhesive layer is relatively high when the hot melt adhesive layer is used as a buffer layer, because if the hot melt adhesive layer is coated too thin, the hot melt adhesive layer can only achieve the hot melt adhesive effect and cannot play the role of buffering, however, the thicker the hot melt adhesive layer is, the better the buffering effect is, because the hot melt adhesive layer is coated too thick, the thicker the adhesive layer between the leveling curing layer and the elastic layer is, and for the hot melt adhesive with insufficient cohesive force, the lower adhesive strength can be caused, the stability of the composite structure is reduced, the structural stability of crack repairing is reduced, and the cracking resistance effect is reduced.
Optionally, the anti-cracking layer compounding comprises anti-cracking layer prefabrication and anti-cracking layer pasting; the anti-cracking layer is prepared by compounding an elastic layer and a plastic layer, and then compounding a buffer layer on the surface of the elastic layer, which is far away from the plastic layer, so as to prepare the anti-cracking layer; the anti-cracking layer is adhered by coating a composite adhesive layer on the leveling solidification layer, and then adhering the anti-cracking layer obtained by prefabrication of the anti-cracking layer on the composite adhesive layer.
Through the technical scheme, the buffer layer, the elastic layer and the plastic layer are prefabricated into a whole in advance, the controllability of the composite operation is improved, a plurality of composite procedures in the repairing and constructing process of the building crack are reduced, the construction difficulty is reduced, the site construction efficiency is improved, and meanwhile, the influence of the construction environment factors on the composite action among the buffer layer, the elastic layer and the plastic layer can be reduced.
Optionally, the anti-cracking layer is compounded by coating a first composite adhesive layer on the surface of the leveling solidification layer, then pasting an elastic layer on the first composite adhesive layer, then coating a second composite adhesive layer on the elastic layer, and then pasting a plastic layer on the second composite adhesive layer.
The composite construction of the anti-cracking layer is carried out on site, so that the method is suitable for the conditions of less cracks to be repaired and low construction amount, and is convenient for local material taking and implementation.
Optionally, the reinforcing layer is alkali-resistant glass fiber mesh cloth.
The alkali-resistant glass fiber mesh cloth is formed by treating an alkali-resistant coating on the basis of a medium alkali or alkali-free glass fiber woven fabric, and has the advantages of high strength, good cohesiveness, good fitting property and good positioning property. The alkali-resistant glass fiber mesh can be used as an outer surface layer framework, so that the strength of the outer surface layer is improved, namely the strength of a crack repairing position is improved, and the crack resistance is improved.
Optionally, the width of the leveling layer is greater than the width of the anti-cracking layer by 1-3mm, the width of the reinforcing layer is greater than the width of the anti-cracking layer by 200mm, and the anti-cracking layer is positioned at the middle position of the reinforcing layer and also positioned at the middle position of the leveling layer.
Through above-mentioned technical scheme, the width of screed-coat, enhancement layer is all greater than the crack resistant layer, and crack resistant layer is located between screed-coat, the enhancement layer after crack repair construction is accomplished, and crack resistant layer is wrapped wherein by screed-coat and enhancement layer, reduces the exposure phenomenon of crack resistant layer bonding gap, protects the bonding gap of crack resistant layer, improves crack resistant layer's bonding stability, simultaneously, can also cover with the surface smoothness that improves crack repair position through the enhancement layer.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the special putty is adopted for scraping the leveling layer, and the obtained leveling layer has high structural strength, is not easy to fall off powder and has a smooth surface, so that the composite stability between the leveling layer and the crack-resistant layer is improved, the crack-resistant effect of crack repair is improved, and the service life of repairing crack resistance is prolonged; 2. the plastic layer of the crack resistant layer adopts polyester cotton cloth, in the construction process of the building crack repairing method, the reinforcing layer is compositely arranged on the polyester cotton cloth, after putty is adopted for coating during the reinforcing layer compositing, the reinforcing layer is laminated into the putty layer, and the reinforcing layer compositing is completed after the putty layer is dried, in the process, as polyester fibers belong to hydrophobic fibers, the polyester cotton cloth has weak water absorption, the water absorption rate of the polyester cotton cloth to the putty layer coated on the polyester cotton cloth is low, the putty drying speed can be reduced, the water volatilization speed of the putty layer is reduced, the surface layer of the putty layer can be cured with sufficient water, the powder removal phenomenon caused by low water loss curing effect of the putty surface layer is reduced, the composite stability of the reinforcing layer positioned on the polyester cotton cloth (crack resistant layer) can be improved, the crack resistant reinforcing effect is improved, the stability of the crack repairing structure is improved, and the crack repairing effect is improved.
Drawings
FIG. 1 is a schematic view of the structure of the crack resistant layer obtained in preparation example 5 of the present application.
Fig. 2 is a schematic view of a crack repairing structure of example 1 of the present application.
Reference numerals illustrate: 1. a wall body; 11. a wall base layer; 2. cracking; 21. filling joints; 3. a substrate curing layer; 4. a leveling layer; 5. leveling the cured layer; 6. a composite adhesive layer; 7. an anti-crack layer; 71. a plastic layer; 72. an elastic layer; 73. a glue layer; 74. a buffer layer; 75. a peelable layer; 76. an exhaust hole; 8. a composite putty layer; 9. a reinforcing layer; 10. an outer surface layer.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-2.
The embodiment of the application discloses a building crack repairing method.
Preparation example
Preparation example 1
A preparation method of the modulated putty comprises the following steps:
stirring and mixing the polyvinyl acetate emulsion and clear water for 3 minutes according to the mass ratio of 1:3 to obtain a first mixture; the polyvinyl acetate emulsion is white tower brand polyvinyl acetate emulsion BT-03.
Stirring and mixing the putty for indoor use and the white silicate cement for 3 minutes according to the mass ratio of 3:1 to obtain a second mixture; the indoor putty is interior wall leveling putty of Runxiang novel building materials Co., ltd, and the white silicate cement is No. 325 white silicate cement.
And adding the second mixture into the first mixture, and stirring and mixing the first mixture and the second mixture for 5 minutes according to the mass ratio of 1:3 to obtain the required prepared putty.
The stirring in the preparation process can be either hand stirring or mechanical stirring, and only the mixing effect can be fully realized, and the mechanical stirring is adopted in the preparation example.
Preparation example 2
The preparation method of the prepared putty is different from that of preparation example 1 in that: the second mixture in preparation example 2 was only putty for indoor use.
Preparation example 3
The preparation method of the prepared putty is different from that of preparation example 1 in that: the first mixture in preparation example 3 was clear water only.
Preparation example 4
The preparation method of the prepared putty is different from that of preparation example 1 in that: the first mixture in preparation example 4 is clear water only, and the second mixture is putty for indoor use only.
Preparation example 5
Referring to fig. 1, a method for preparing an anti-crack layer sequentially includes the steps of:
selecting polyester cotton cloth as plastic layer 71, and coating hot melt adhesive on one side of plastic layer 71 to form adhesive layer 73 on one side of plastic layer, wherein the coating amount of hot melt adhesive is 120g/m 2 The hot melt adhesive is synthetic resin.
The terylene full lining elastic cloth is selected as the elastic layer 72, and the elastic layer 72 is flatly attached to the adhesive layer 73, namely the elastic layer 72 is adhered and compounded with the plastic layer 71 through the adhesive layer 73.
Coating hot melt adhesive on one surface of the polyester full-lining elastic fabric far away from the polyester cotton cloth to form a buffer layer 74 on one surface of the polyester full-lining elastic fabric far away from the polyester cotton cloth, wherein the coating amount of the hot melt adhesive is 140g/m 2 The hot melt adhesive is synthetic resin.
And compounding a strippable layer 75 on one surface of the buffer layer 74, which is far away from the polyester full-lining elastic cloth, wherein the strippable layer 75 is release paper, and the required anti-cracking layer is obtained.
Laser drilling is performed on the crack resistant layer to form vent holes 76 penetrating through the plastic layer 71, the adhesive layer 73, the elastic layer 72, the buffer layer 74 and the peelable layer 75 on the crack resistant layer, and the plurality of vent holes 76 are arranged in a rectangular array on the crack resistant layer. The spacing between adjacent vent holes 76 may be 15mm. The vent 76 can provide a vent path for the crack resistant layer to adhere when used for repairing a building crack, and improves the smooth fit between the crack resistant layer and the building structure, so as to improve the adhesive strength of the crack resistant layer and improve the crack resistant application effect.
Preparation example 6
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: in preparation example 6, the plastic layer 71 was replaced with the elastic layer 72.
Preparation example 7
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: in preparation example 7 the elastic layer 72 was replaced by a plastic layer 71.
Preparation example 8
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: in preparation example 8, the plastic layer 71 was made of cotton cloth.
Preparation example 9
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: the hot melt adhesive coating amount of the buffer layer 74 in preparation example 9 was 120g/m 2 。
Preparation example 10
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: the hot melt adhesive coating amount of the buffer layer 74 in preparation example 10 was 150g/m 2 。
PREPARATION EXAMPLE 11
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: the hot melt adhesive coating amount of the buffer layer 74 in preparation example 11 was 160g/m 2 。
Preparation example 12
The preparation method of the anti-cracking layer is different from that of preparation example 5 in that: the hot melt adhesive coating amount of the buffer layer 74 in preparation example 11 was 180g/m 2 。
Examples
Example 1
Referring to fig. 2, a method for repairing a construction crack sequentially includes the steps of:
and (3) cleaning a substrate: removing and cleaning original wall base layers 11 on the surface of the wall body 1, wherein the wall base layers 11 specifically refer to original decorative putty; and caulking 21 the wall cracks 2;
coating a substrate curing layer: rolling and coating a curing agent on the cleaned substrate to form a substrate curing layer 3 on the cleaned substrate, and drying for 2 hours after rolling and coating; the substrate is solidified to improve the strength of the substrate, and phenomena such as hollowing and falling off which possibly occur after the subsequent leveling layer is scraped are reduced; the curing agent adopts curing agent of Fukukokuli building material science and technology Co., ltd, the water resistance of the curing agent is 96H (GB/T1733-93), and the adhesive force with concrete slab is more than 3.5MPa (GB/T5210-2006);
scraping and batching the leveling layer: the prepared putty obtained in preparation example 1 is thinly scraped on a base curing layer 3, and base leveling is carried out to form a leveling layer 4, wherein the thickness of the thinly scraped putty is controlled to be 5mm, so that the wall surface is uneven, and the subsequent construction is affected due to the too thin putty; after the leveling layer 4 is scraped and dried, firstly, using 120-mesh sand paper for primary grinding, then using 240-mesh sand paper for regrinding, and finally using 320-mesh sand paper for grinding and cleaning impurities; the surface flatness of the leveling layer 4 is higher and the surface is finer and more uniform by a layer-by-layer polishing mode, so that the bonding strength of the leveling layer 4 and the anti-cracking layer 7 is improved;
leveling and curing layer coating: a curing agent is rolled and coated on the leveling layer 4 to form a leveling curing layer 5 on the leveling layer, and the leveling curing layer is dried for 2 hours after the rolling and coating; curing the leveling layer through penetrating of the curing agent, and improving the surface strength of the leveling layer;
and (3) compounding an anti-cracking layer: brushing a composite adhesive on the leveling curing layer 5 to form a composite adhesive layer 6 on the leveling curing layer 5, wherein the width of the composite adhesive layer 6 is larger than that of the crack resistant layer 7 by 20mm, the composite adhesive adopts composite adhesive of Fukukokumi building materials science and technology Co., ltd, the viscosity of the composite adhesive is larger than 88mPas (GB/T2794-2013), and the 180-degree peel strength is larger than 40N/25mm (JC/T548-2016); the anti-cracking layer pasting should be completed within 72 hours of the composite glue brushing; the anti-cracking layer 7 is the anti-cracking layer obtained in preparation example 5, after the release paper 75 of the anti-cracking layer 7 is peeled off, the anti-cracking layer 7 is stuck to the middle position of the composite adhesive layer 6, and the anti-cracking layer 7 is centered along the center of the crack 2 of the wall body 1; the surface of the anti-cracking layer 7 is required to be bubble-free and wrinkle-free after being pasted;
compounding a reinforcing layer: the reinforcing layer 9 is made of alkali-resistant glass fiber mesh cloth, after the anti-cracking layer 7 is compounded, the prepared putty of the preparation example 1 is thinly scraped on the anti-cracking layer 7 to form a compound putty layer 8 on the anti-cracking layer, then the alkali-resistant glass fiber mesh cloth is pressed into the compound putty layer 8, and the reinforcing layer 9 is compounded after the compound putty layer 8 is dried thoroughly; the width of the reinforcing layer 9 is 200mm larger than that of the anti-cracking layer 7, and the anti-cracking layer 7 is positioned in the middle of the reinforcing layer 9;
scraping and polishing the outer surface layer: the exterior surface layer 10 is formed on the reinforcing layer 9 by thin-coating the reinforcing layer 9 with the prepared putty of preparation example 1, and polishing the exterior surface layer 10 after the putty dries out.
Example 2
A method for repairing a construction crack, the present embodiment is different from embodiment 1 in that the crack resistant layer composite construction operation of embodiment 2 is different from embodiment 1.
The building crack repair method of embodiment 2 comprises the steps of compounding anti-cracking layers, wherein the anti-cracking layers are as follows:
selecting polyester full-lining stretch cloth and polyester cotton cloth as an anti-cracking layer; the width of the polyester full-lining elastic cloth is the same as that of the polyester cotton cloth; brushing a composite adhesive on the leveling curing layer to form a first composite adhesive layer on the leveling curing layer, wherein the width of the first composite adhesive layer is 20mm larger than that of the polyester full-lining elastic cloth, firstly, the polyester full-lining elastic cloth is attached to the first composite adhesive layer, and the polyester full-lining elastic cloth is positioned in the middle of the first composite adhesive layer and centered along the center of the crack; coating a second composite adhesive layer on one surface of the polyester full-lining elastic fabric, which is far away from the leveling layer, wherein the width of the second composite adhesive layer is 20mm larger than that of the polyester cotton cloth, attaching the polyester cotton cloth to the second composite adhesive layer, and centering the polyester cotton cloth along the center of the crack, wherein the polyester cotton cloth is positioned in the middle of the second composite adhesive layer; and finishing the composite construction of the anti-cracking layer.
Example 3
The construction crack repairing method is different from embodiment 2 in that in the construction, in order to improve the bonding strength of the polyester full-lining elastic fabric and the polyester cotton cloth, before the polyester full-lining elastic fabric is compounded with the first composite adhesive layer and before the polyester cotton cloth is compounded with the second composite adhesive layer, the polyester full-lining elastic fabric and the polyester cotton cloth are respectively coated with adhesives.
In order to avoid the need of coating the adhesive of the polyester full-lining elastic cloth and the polyester cotton cloth on the construction site, the polyester full-lining elastic cloth and the polyester are improvedThe convenience of cotton field construction. In other embodiments, the polyester full-lining elastic cloth and the polyester cotton cloth are prepared by gluing in advance. Specifically, one surface of the terylene full lining elastic cloth is coated with an adhesive layer, and release paper is compounded on the adhesive layer; one side of the polyester cotton cloth is coated with an adhesive layer, and release paper is compounded on the adhesive layer; and then, the polyester full-lining elastic cloth and the adhesive layer are coated with the adhesive layer in advance during construction, so that the polyester full-lining elastic cloth and the adhesive layer can be directly bonded and applied only by stripping the release paper. The adhesive can be hot melt adhesive, and the coating amount of the adhesive layer of the polyester full-lining elastic fabric is controlled to be 140g/m 2 -160g/m 2 。
Performance test
Detection method
Experiment 1: putty appearance and chalking phenomenon test
Cutting a fiber reinforced cement board with the thickness of 15mm into a plurality of test blocks with the thickness of 10cm multiplied by 10cm by using a cutting saw, respectively brushing the prepared putty prepared in preparation examples 1-4 on each fiber reinforced cement test block, and correspondingly marking preparation examples 1-4 to finish the preparation of putty test products in preparation examples 1-4; after the prepared putty of preparation example 1 is respectively coated on each fiber reinforced cement test block, the anti-cracking layers of preparation examples 5-12 are compounded according to the steps of a building crack repairing method, and the prepared putty of preparation example 1 is coated on the anti-cracking layers of preparation examples 5-12, so that the preparation of putty test products of preparation examples 5-12 is completed.
After the prepared putty is dried, observing whether the surface layer of the putty has apparent defects such as cracks and the like, touching the surface layer of the prepared putty by hand, observing the condition of sticking powder on hand, and when the more obvious the phenomenon of sticking powder on hand is, the more serious the phenomenon of powder dropping of the putty is, the more obvious the pulverization phenomenon is, and the structural strength of the putty is insufficient.
The results of the detection are shown in Table 1 below
TABLE 1 apparent and chalking test results Table
According to the apparent and pulverization results of preparation examples 1-4, compared with preparation examples 2-4, the preparation example 1 has the advantages that the putty performance is coordinated and balanced through specific proportion and composition, and the painting effect is good. Mainly because the uneven coordination and matching among the components in the preparation examples 2-4 cause the problems of over-high drying speed or uneven drying speed after the putty is coated, and the appearance is poor and the powder is dropped.
According to the comparison of the appearance and the pulverization results of preparation examples 5-12, when the prepared putty obtained in preparation example 1 is coated on the plastic layer of the cracking-resistant layer, the obvious plastic layer is the putty coating effect of preparation examples 5-7 and 9-12 of the polyester cotton cloth, while the putty coating effect of preparation example 8 of the plastic layer is obviously poor, mainly because the cotton cloth has excellent water absorption relative to the polyester cotton cloth, the putty coated on the plastic layer is easy to be dried too quickly and unevenly, and the putty coating effect is further affected.
Experiment 2: physical property detection of crack resistant layer
Physical property tests were performed on the crack-resistant layers prepared in preparation examples 5 to 11, respectively, physical property test items and crack-repairing crack-resistant technical requirements are shown in the following table 2, and test results are shown in the following table 3.
TABLE 2 physical property test items of crack resistant layer
Table 3, physical properties test results of the anti-crack layer according to the physical properties test results of the anti-crack layer, it can be seen that the comprehensive physical properties of the anti-crack layer preparation example 5, preparation example 10 and preparation example 11, which adopt the polyester full-lining elastic cloth, the polyester cotton cloth and the buffer layer, are optimal, and all can meet the required anti-crack technical requirements.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (10)
1. The building crack repairing method is characterized by comprising the following steps in sequence: cleaning a substrate, coating a substrate curing layer (3), scraping a leveling layer (4), coating a leveling curing layer (5), compounding an anti-cracking layer (7), compounding a reinforcing layer (9), scraping an outer surface layer (10), and polishing; wherein the leveling layer (4) is scraped by adopting a material as a modulation putty; the prepared putty comprises a first mixture and a second mixture, wherein the mass ratio of the first mixture to the second mixture is 1:3; the first mixture comprises polyvinyl acetate emulsion and clear water, and the mass ratio of the polyvinyl acetate emulsion to the clear water is 1:3; the second mixture comprises putty and white silicate cement for indoor use, and the mass ratio of the putty to the white silicate cement for indoor use is 3:1.
2. The method for repairing a construction crack according to claim 1, wherein: the crack resistant layer (7) comprises an elastic layer (72) and a plastic layer (71), wherein the elastic layer (72) is positioned between the leveling cured layer (5) and the plastic layer (71).
3. The method for repairing a construction crack according to claim 2, wherein: the elastic layer (72) is polyester full-lining elastic cloth.
4. The method for repairing a construction crack according to claim 2, wherein: the plastic layer (71) is polyester cotton cloth.
5. The method for repairing a construction crack according to claim 2, wherein: a buffer layer (74) is further coated between the elastic layer (72) and the leveling solidification layer (5).
6. The method for repairing a construction crack according to claim 5, wherein: the buffer layer (74) is a hot melt adhesive layer, and the coating amount of the hot melt adhesive layer is 140g/m 2 -160g/m 2 。
7. The method for repairing a construction crack according to claim 5, wherein: the anti-cracking layer (7) is compounded and comprises the steps of prefabricating the anti-cracking layer (7) and pasting the anti-cracking layer (7);
the anti-cracking layer (7) is prepared by compounding an elastic layer (72) and a plastic layer (71) firstly, and then compounding a buffer layer (74) on the surface of the elastic layer (72) away from the plastic layer (71) to prepare the anti-cracking layer (7);
the anti-cracking layer (7) is adhered to the leveling solidification layer (5) by coating the composite adhesive layer (6), and then the anti-cracking layer (7) prefabricated by the anti-cracking layer is adhered to the composite adhesive layer (6).
8. The method for repairing a construction crack according to claim 2, wherein: the anti-cracking layer (7) is compounded by coating a first composite adhesive layer on the surface of the leveling solidification layer (5), then adhering an elastic layer (72) on the first composite adhesive layer, then coating a second composite adhesive layer on the elastic layer (72), and then adhering a plastic layer (71) on the second composite adhesive layer.
9. The method for repairing a construction crack according to claim 1, wherein: the reinforcing layer (9) is alkali-resistant glass fiber mesh cloth.
10. The method for repairing a construction crack according to claim 1, wherein: the width of the leveling layer (4) is larger than the width of the anti-cracking layer (7) by 1-3mm, the width of the reinforcing layer (9) is larger than the width of the anti-cracking layer (7) by 200mm, and the anti-cracking layer (7) is positioned at the middle position of the reinforcing layer (9) and is also positioned at the middle position of the leveling layer (4).
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