CN109025354B - Construction method for cracking resistance of wall - Google Patents
Construction method for cracking resistance of wall Download PDFInfo
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- CN109025354B CN109025354B CN201810983571.XA CN201810983571A CN109025354B CN 109025354 B CN109025354 B CN 109025354B CN 201810983571 A CN201810983571 A CN 201810983571A CN 109025354 B CN109025354 B CN 109025354B
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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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Abstract
The invention provides a construction method for cracking resistance of a wall body, and belongs to the field of buildings. It should include: reserving stress release seams at the end parts of the wall boards and at the junctions of the shearing walls, the columns, the beams and the wall boards, filling elastic cement into the stress release seams, then pasting glass fiber cloth, standing the stress release seams for 10-30 days, repairing cracks by using high-elastic fiber putty, and pasting the glass fiber cloth again; after the base surface of the wall body is treated by the high-elastic fiber putty, the glass fiber gridding cloth is integrally paved and coated. The construction method is simple, strong in operability and good in anti-cracking effect, and can effectively reduce the cracking probability of the building.
Description
Technical Field
The invention relates to the field of buildings, in particular to a construction method for cracking resistance of a wall body.
Background
At present, the factors related to the formation of wall cracks are many, and the factors include foundation settlement, temperature change and shrinkage deformation, as well as design structure, materials, construction quality and engineering management. The most common cracks can be classified into four categories according to their causes. First, temperature cracking; second, dry shrinkage cracking for short, and cracking caused by both temperature and dry shrinkage; thirdly, designing cracks caused by the structure; and fourthly, cracks caused by construction quality.
The shrinkage crack is a crack which is formed after concrete is formed and is cracked on the surface due to the fact that the shrinkage deformation of the surface caused by uneven change of internal and external humidity is subjected to the constraint tensile stress of the internal concrete. Generally, the greater the length of the wall, the greater the cumulative deformation. According to the requirements of JG3063-99 standard, the drying shrinkage deformation of the ribbon board should be less than 0.6mm/m, and the water content is less than 10%. After the wall body is installed, the drying shrinkage of the wall body still occurs, when the water content of the wall body is large and the length of the wall body is more than 5m, the accumulated shrinkage value can reach 3mm, even if the shrinkage value of 0.2mm/m exists, the accumulated shrinkage value can also reach 1 mm. If the joint between the wallboard and the column is not processed during installation, shrinkage cracks of the wall are easy to concentrate on the joint, and obvious cracks are formed.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention aims to provide a construction method for cracking resistance of a wall, which is simple, strong in operability and good in cracking resistance effect and can effectively reduce the cracking probability of a building.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a construction method for cracking resistance of a wall body comprises the following steps:
reserving stress release seams at the end parts of the wall boards and at the junctions of the shearing walls, the columns, the beams and the wall boards, filling elastic cement into the stress release seams, then pasting glass fiber cloth, standing the stress release seams for 10-30 days, repairing cracks by using high-elastic fiber putty, and pasting the glass fiber cloth again;
after the base surface of the wall body is treated by the high-elastic fiber putty, the glass fiber gridding cloth is integrally paved and coated.
Compared with the prior art, the invention has the beneficial effects that:
according to the construction method for cracking resistance of the wall body, provided by the invention, the stress release seam is reserved at the seam between the wall board and the wall board or other building structures (such as columns, beams and the like), and elastic cement is filled in the stress release seam and glass fiber cloth is pasted to increase the cracking resistance of the wall body at the seam; meanwhile, the crack at the joint is repaired by using the high-elastic fiber putty, and the glass fiber cloth is pasted again, so that the crack resistance of the wall body can be further enhanced due to the excellent ductility and film forming property of the high-elastic fiber putty. The construction method is simple, strong in operability and good in anti-cracking effect, and can effectively reduce the cracking probability of the building.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The embodiment provides a wall body crack resistance construction method, which comprises the following steps:
step S1, wall seam processing:
reserving stress release seams at the end parts of the wall boards and at the junctions of the shearing walls, the columns, the beams and the wall boards, filling elastic cement into the stress release seams, then pasting glass fiber cloth, standing the stress release seams for 10-30 days, repairing cracks by using high-elastic fiber putty, and pasting the glass fiber cloth again.
The stress release seam is reserved at the end part of the wallboard, namely the stress release seam is reserved at the joint of the wallboard and the wallboard. Preferably, expansion joints are reserved at two ends of the wall plate in the middle of the wall body. Meanwhile, in order to reduce the shrinkage deformation of the wall body, the wall board with a small drying shrinkage value is preferably selected; more preferably, the dry shrinkage value of the wallboard is 0.01-0.03 mm/m.
The glass fiber cloth is an inorganic non-metallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength. Glass fibers are commonly used as reinforcement in composites. Preferably, 01 of platinum glass fiber cloth is selected and mainly used at the joint of a shear wall, a column, a beam and a wallboard and the joint of a stress release seam or a door head plate so as to enhance the crack resistance of the wall body at the joint.
The elastic clay is obtained by mixing water and mixed powder formed by high-elastic fiber putty and rubber powder; preferably, the percentage content of the high-elasticity fiber putty in the mixture powder is 3-10 wt%, or 4-9 wt%, or 5-8 wt%. Preferably, the particle size of the rubber powder is 500-800 meshes. The elastic daub has good ductility and is beneficial to enhancing the crack resistance of the wall.
Further, when the wall exceeds 6 meters, the calculation formula of the width of the stress release seam is as follows:
the width of the stress-relief crack is (wall length × shrinkage value + width of a crack generated by pressure due to deflection of the beam) × 1.2.
Further, when the building exceeds 100m, the calculation formula of the width of the stress relief slit is:
the width of the stress-relief crack is (wall length × shrinkage value + pressure-induced crack width due to beam deflection + high-rise displacement coefficient × 0.5%) × 1.2.
Wherein, the 'width of crack generated by pressure caused by deflection of beam' in the formula can calculate the generated pressure by measuring the deflection of beam, and calculate the width of crack according to the pressure value; of course, the crack width can also be determined empirically by those skilled in the art.
Further, still include: elastic adhesive tape is filled in the stress release seam reserved at the end part of the wallboard, and then the elastic daub is filled in the stress release seam.
The elastic rubber strip is a rubber strip or other elastic rubber strips. Elastic rubber strips are filled in the stress release seams reserved at the end parts of the wall boards, so that the open tenons and the blind tenons of the wall boards can be protected from being extruded and lost in the deformation process of the wall body, and the service life of the wall body is prolonged.
Further, still include: and adhering an elastic adhesive tape in the mortise, coating elastic cement paste, and installing the wallboard.
Step S2, wall body base surface processing:
after the base surface of the wall body is treated by the high-elastic fiber putty, the glass fiber gridding cloth is integrally paved and coated.
The glass fiber mesh fabric takes a glass fiber woven fabric as a base material, and the coating is soaked in the high-molecular emulsion-resistant solution, so that the glass fiber mesh fabric has good alkali resistance, flexibility and high tensile resistance in the warp and weft directions. In the present embodiment, the crack resistance of the wall body can be further enhanced by laying the glass fiber mesh cloth on the base surface of the entire wall body. Preferably, 170g of platinum fiber mesh cloth is selected, and the mesh spacing is 5mm × 5 mm.
Furthermore, when the glass fiber mesh cloth is integrally paved on the base surface of the wall body, the lap joint width of the glass fiber mesh cloth and the joint positions of the shear wall, the column and the beam is 15-25 cm.
Further, the coating construction comprises the following steps: and fully putty-coating the base surface with high-elastic fiber putty.
And (3) fully scraping the putty for 2-4 times generally, and preferably, fully scraping the base surface with high-elastic fiber putty for the 1 st time so as to improve the crack resistance of the whole wall. And 2, fully scraping by using high-elasticity fiber putty or common putty commonly used in the field for 2-4 times.
In the embodiment, the used high-elasticity fiber putty has strong extensibility and high film-forming property, and can effectively solve the risk of wall cracking.
Further, the high-elasticity fiber putty is prepared by mixing liquid slurry and putty powder according to the mass ratio of 1-5: 25 mixing the obtained mixture;
the putty powder comprises the following components in parts by weight: 8-10 parts of water-soluble flexible putty glue powder, 1-2 parts of polypropylene short fiber, 350-450 parts of cement and 540-700 parts of calcium powder;
or the putty powder comprises the following components in parts by weight: 9-10 parts of water-soluble flexible putty glue powder; 1-2 parts of polypropylene short fibers; 370-430 parts by weight of cement; 580-670 parts of calcium powder.
Wherein, the cement and the water-soluble flexible putty glue powder are jointly used as a binder to play a role in binding. The cement is a bonding agent with good bonding property, durability and reasonable cost performance, but has poor tensile strength and crack resistance. More preferably, portland white (cement) cement is used.
The water-soluble flexible putty powder can modify and toughen cement, thereby improving the performance of the putty powder. More preferably, the water-soluble flexible putty rubber powder is HK-R109 water-soluble flexible rubber powder at normal temperature.
The putty powder also comprises polypropylene short fibers, and the crack resistance of the putty can be improved.
Calcium powder is used as filler and mainly plays a role in filling. In the selection of the filler, care should be taken to take into account the packing and water absorption.
Further, the calcium powder comprises 120-200 parts by weight of sierozem powder and 420-500 parts by weight of heavy calcium powder; preferably, the calcium powder comprises 140-180 parts by weight of sierozem powder and 450-480 parts by weight of heavy calcium powder; preferably, the calcium powder comprises 150-170 parts by weight of sierozem powder and 460-470 parts by weight of heavy calcium powder.
Or the calcium powder comprises 120-200 parts by weight of sierozem powder and 420-500 parts by weight of talcum powder; preferably, the calcium powder comprises 140-180 parts by weight of sierozem powder and 450-480 parts by weight of talcum powder; preferably, the calcium powder comprises 150-170 parts by weight of sierozem powder and 460-470 parts by weight of talcum powder.
Ash calcium powder as CaCO3The natural high-quality limestone as main component is calcined at high temp. to obtain raw lime (CaO), then carefully selected and partially digested, and its main component is Ca (OH)2. Then the mixture is crushed by a high-speed winnowing hammer type crusher, and the appearance of the mixture is pure white and fine. The granularity is 400-700 meshes.
Heavy calcium powder is produced with high quality limestone as material and through grinding in lime mill into white powder with CaCO as main component3. The heavy calcium carbonate has the characteristics of high whiteness, good purity, soft color phase, stable chemical components and the like.
The putty powder for cracking resistance of the wall has the advantages of high flexibility, strong waterproof and cracking resistance, high bonding degree, no toxicity and no odor, can effectively prevent cement from shrinking and cracking, and has good constructability, smooth hand feeling, reduced maintenance time and the like.
Wherein the liquid slurry comprises the following components in parts by weight:
70-130 parts of acrylic emulsion; 70-130 parts of waterborne polyurethane resin; and 2.5-6 parts of an auxiliary agent.
Or, by weight, 95-105 parts of acrylic emulsion; 95-105 parts of waterborne polyurethane resin; and 5-6 parts of an auxiliary agent.
The aqueous polyurethane resin is an anionic aliphatic aqueous polyurethane dispersion, and has the advantages of good film-forming water resistance, full hand feeling, solvent resistance, excellent scratch resistance and elongation at break of 1200%.
And after the acrylic emulsion is compounded with the waterborne polyurethane resin, the obtained high-elasticity fiber putty has excellent alkali resistance and waterproof properties. More preferably, the acrylic emulsion is an HK-R100 type emulsion.
Further, in the high-elasticity fiber putty, the ratio of the liquid slurry to the putty powder in use is 1-5: 25; or 2-4: 25; or 3: 25. in the specific use process, the putty powder and the liquid slurry are mixed according to the mass ratio, and water is added to adjust the mixture to be of applicable viscosity, and the mixture can be sprayed or troweled.
Further, the auxiliary agents include defoaming agents, thickening agents and dispersing agents, and are used for improving the storage and construction performance of the putty.
Preferably, the defoaming agent is 0.5-1 part by weight, the thickening agent is 1-2 parts by weight, and the dispersing agent is 1-2 parts by weight; or 0.6-0.9 part of defoaming agent, 1.2-1.8 parts of thickening agent and 1.2-1.8 parts of dispersing agent in parts by weight; or 0.7-0.8 part of defoaming agent, 1.4-1.6 parts of thickening agent and 1.4-1.6 parts of dispersing agent in parts by weight.
Wherein the thickener comprises methylcellulose, hydroxypropyl methylcellulose, sodium carboxymethylcellulose, and hydroxyethyl cellulose.
In order to further improve the antiseptic and mildew-proof properties of the high-elasticity fiber putty, the auxiliary agent also comprises: 0.5-1 part by weight of a bactericide; or 0.6-0.9 weight part of bactericide; or 0.7-0.8 weight part of bactericide. Preferably, the bactericide is KATHON LXE (produced by Rohm and Haas). The main components of the bactericide are 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, which have broad-spectrum bactericidal action and can simultaneously inhibit bacteria (including gram negative and gram positive bacteria) and fungi (yeasts, molds and the like).
Further, the liquid slurry is prepared by mixing and stirring the acrylic emulsion, the waterborne polyurethane resin and the auxiliary agent for 10-20 min, and then standing for 5-10 min.
The features and properties of the present invention are further described in detail below with reference to examples:
example 1
The embodiment provides a construction method for crack resistance of a wall body, which comprises the following steps:
firstly, treating vertical cracks of a wall body:
a. stress releasing seams are reserved at the end parts of the wall boards and at the junctions of the shearing walls, the columns, the beams and the wall boards. And (4) calculating the clearance of the stress release joint according to the contraction value of the wallboard multiplied by the length of the wall, and then adding other coefficients which can influence cracking to reserve according to the length of the wall.
For example, when the wall exceeds 6 meters, the calculation formula of the width of the stress relief seam is as follows:
the width of the stress-relief crack is (wall length × shrinkage value + width of a crack generated by pressure due to deflection of the beam) × 1.2.
For example, when the building exceeds 100m, the calculation formula of the width of the stress relief slit is:
the width of the stress-relief crack is (wall length × shrinkage value + pressure-induced crack width due to beam deflection + high-rise displacement coefficient × 0.5%) × 1.2.
b. When the wall board is installed, selecting the wall board with the drying shrinkage value of 0.01-0.03 mm/m, pasting an elastic adhesive tape in the blind tenon, coating elastic cement paste, and installing the wall board; and then, adhering glass fiber cloth at the seam, standing the stress release seam for 10-30 days, and polishing and flattening the crack position by using a polishing machine to clean the crack position. Repairing cracks with high-elastic fiber putty, polishing and cleaning after drying, flattening with elastic cement, and sticking glass fiber cloth at the seams again; and coating polymer mortar in the grooves of the wallboard, extruding the glass fiber mesh cloth into the mortar, and compacting, paving and flattening by using a special tool with teeth.
c. And reserving stress release seams at junctions of the wallboard and the shearing wall, the column and the beam, filling elastic cement into the stress release seams, then adhering glass fiber cloth, standing the stress release seams for 10-30 days, and polishing and flattening the cracking positions by using a polisher to clean the cracking positions. Repairing the crack with high-elasticity fiber putty, polishing and cleaning after drying, flattening the crack with elastic cement, and sticking glass fiber cloth at the crack again.
Secondly, crack treatment of the junction of the wall body and the beam and the ground floor slab:
a. ground seam processing: at present, most of wallboard is installed in a suspended mode, and ground seams need to be filled with marble fragments or other crushed stone and mortar in a mixed mode. Marble or crushed stone blocks mainly prevent the risk of cracking due to the sinking caused by the weight of the wall itself. The ground seam is covered by skirting lines.
b. And (3) top seam treatment: and (3) leveling the top seams by using a special sawtooth tool after grouting and compacting, standing the cracking positions for 10-30 days, polishing and leveling the cracking positions by using a polisher, and cleaning the cracking positions. Repairing the crack with high-elasticity fiber putty, polishing and cleaning after drying, flattening the crack with elastic cement, and sticking glass fiber cloth at the crack again.
Thirdly, crack resistance treatment of the wall body:
the method comprises the following steps of cleaning a base surface of a wall body, treating the whole base surface of the wall body by using high-elastic fiber putty, rolling or spraying a binder, integrally paving and adhering glass fiber mesh cloth (the mesh interval is 5mm multiplied by 5mm), wherein the lap joint width of the glass fiber mesh cloth and the joint positions of a shear wall, a column and a beam is 15-25 cm.
Fourthly, wall coating construction:
A. base layer treatment:
(1) the cleaning tool is used for cleaning dust and other attachments.
(2) And cleaning the splashed mortar, the flow marks and the like by using a scraper knife and a steel wire brush.
(3) 5% -10% sodium hydroxide water solution is used for cleaning dirt such as oil stain, a release agent and the like, and then the dirt is washed clean by clear water.
(4) Hollowing, loosening, peeling, sanding, etc. are cleaned by a scraper knife, washed by clear water, and then repaired.
B. Fully putty scraping:
after the surface is cleaned, the putty is prepared into proper consistency, the rough surface, the honeycomb, the holes and the incomplete parts of the wall surface are filled by the putty, after the putty is dried completely, the redundant putty is firstly shoveled and leveled by a knife, and then the putty is leveled by coarse abrasive paper.
(1) First-time puttying and polishing: after the large gap of the indoor coating surface is filled and leveled, the high elastic fiber putty is fully scraped by using a batch embedding tool.
All tiny sand holes and shrinkage cracks need to be fully scraped, and the density, flatness and regular line angle edges are taken as degrees. Meanwhile, the scraping should be conducted along the wall surface transversely along the scraping direction, the scraping cannot be missed, joints cannot be left in racking, and the door and the window and other objects cannot be stained. After the putty is dried completely, the small flat wood board is wrapped by No. 1 abrasive paper, the putty slag and the uneven parts are polished to be flat, the attention is paid to the uniformity, and the edges and corners are protected. Cleaning the ground product by a cleaning tool.
(2) And (3) fully putty scraping and polishing for the second time: the second full putty-applying method is the same as the first putty-applying method, but the second full putty-applying method requires that the second full putty-applying method is common putty, the putty-applying direction of the second full putty is mutually vertical to the putty-applying direction of the previous full putty, namely the second full putty is vertically applied along the wall surface, and the wall surface is further fully applied, polished, leveled and smoothed until the wall surface is smooth.
(3) And (3) fully putty scraping and polishing for the third time: the third full putty-applying method is the same as the first putty-applying method, but the putty-applying method is required to be common putty, the putty-applying direction of the putty-applying method is perpendicular to the putty-applying direction of the previous putty, namely, the putty-applying method is to vertically apply the putty along the wall surface, and the wall surface is further fully applied and polished to be flat and smooth.
C. Painting or spraying finish paint
(1) First-pass coating: before the first coating is brushed, the surface of a base layer must be cleaned, a row of pens is preferably used during brushing, the brushing sequence is from top to bottom, from left to right, from horizontal to vertical, from side to side, from side to large, from edge to corner and from small to large. Residual paint is not arranged at the internal corner, and the external corner cannot be wrapped with edges. After the first pass of drying, the coating should be inspected universally, e.g. local defects should be repaired once with the coating putty and wiped off with a horn spatula in order not to damage the coating film. After the re-repairing putty is dried completely, the coating surface is polished smoothly by using fine sand paper pulp, the force is applied lightly and uniformly, a paint film cannot be worn through, and the surface is cleaned after grinding.
(2) The second coating brushing and polishing method is the same as the first one.
(3) Coating for the third time: the brushing sequence is the same as the first pass, the surface is required to be more beautiful and fine, and the brush is required to be brushed by using a spread pen. When large-area painting is carried out, a plurality of people are matched with flow line production and are connected with each other.
In the construction method, the used high-carbon-fiber putty is prepared by mixing putty powder and liquid slurry according to the mass ratio of 10: 1 mixing the components.
The putty powder is obtained by mixing the components shown in the table 1.
TABLE 1 putty powder Components and amounts
| Components | Content (wt.) |
| Water-soluble flexible putty glue powder | 9kg |
| Polypropylene short fiber | 1.5kg |
| Cement | 400kg |
| Ash calcium powder | 160kg |
| Heavy calcium powder | 460kg |
The liquid slurry was obtained by mixing and stirring the components in table 2 for 15min, and then standing for 7 min.
TABLE 2 composition and content of liquid slurries
| Components | Content (wt.) |
| Acrylic emulsion | 100kg |
| Aqueous polyurethane resin | 100kg |
| Defoaming agent | 0.75kg |
| Thickening agent | 1.5kg |
| Dispersing agent | 1.5kg |
| Bactericide KATHONLXE | 0.75kg |
Example 2
The embodiment provides a construction method for crack resistance of a wall, which has the specific construction steps basically the same as those of embodiment 1, and is different from the following steps:
in the construction method, the used high carbon fiber putty is prepared by mixing putty powder and liquid slurry according to the mass ratio of 25: 1 mixing the components.
The putty powder is obtained by mixing the components shown in the table 3.
TABLE 3 composition and content of putty powder
The liquid slurry was obtained by mixing and stirring the components in table 4 for 15min, and then standing for 7 min.
TABLE 4 composition and content of liquid slurries
| Components | Content (wt.) |
| Acrylic emulsion | 130kg |
| Aqueous polyurethane resin | 70kg |
| Defoaming agent | 1kg |
| Thickening agent | 1kg |
| Dispersing agent | 2kg |
| Bactericide KATHONLXE | 0.5kg |
Example 3
The embodiment provides a construction method for crack resistance of a wall, which has the specific construction steps basically the same as those of embodiment 1, and is different from the following steps:
in the construction method, the used high carbon fiber putty is prepared by mixing putty powder and liquid slurry according to the mass ratio of 5: 1 mixing the components.
The putty powder is obtained by mixing the components shown in the table 5.
TABLE 5 composition and content of putty powder
| Components | Content (wt.) |
| Water-soluble flexible putty glue powder | 10kg |
| Polypropylene short fiber | 1kg |
| Cement | 350kg |
| Ash calcium powder | 200kg |
| Talcum powder | 420kg |
The liquid slurry is obtained by mixing and stirring the components in table 6 for 20min, and then standing for 10 min.
TABLE 6 composition and amount of liquid slurries
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (5)
1. A construction method for cracking resistance of a wall body is characterized by comprising the following steps:
reserving stress release seams at the end parts of the wall boards and the junctions of the shearing walls, the columns, the beams and the wall boards, filling elastic cement into the stress release seams, then pasting glass fiber cloth, standing the stress release seams for 10-30 days, repairing cracks by using high-elastic fiber putty, and pasting the glass fiber cloth again;
after the base surface of the wall body is treated by the high-elastic fiber putty, glass fiber gridding cloth is integrally paved and coated;
filling elastic adhesive strips in the stress release seams reserved at the end parts of the wall boards, and then refilling the elastic daub;
the elastic clay is obtained by mixing water and mixed powder formed by the high-elastic fiber putty and the rubber powder;
the percentage content of the high-elastic fiber putty in the mixed powder is 3-10 wt%,
the method of installing the wall panel comprises: the elastic adhesive tape is stuck in the blind tenon, the elastic daub is coated, and then the wallboard is installed,
when glass fiber mesh cloth is integrally paved on the base surface of the wall body, the lap joint width of the glass fiber mesh cloth and the joint positions of the shear wall, the column and the beam is 15-25 cm;
the high-elasticity fiber putty is prepared by mixing liquid slurry and putty powder according to the mass ratio of 1-5: 25 mixing the obtained mixture;
the putty powder comprises the following components in parts by weight: 8-10 parts of water-soluble flexible putty glue powder, 1-2 parts of polypropylene short fiber, 350-450 parts of cement and 540-700 parts of calcium powder;
the liquid slurry comprises the following components in parts by weight: 70-130 parts of acrylic emulsion, 70-130 parts of waterborne polyurethane resin and 2.5-6 parts of auxiliary agent;
the auxiliary agent comprises the following components in parts by weight: 0.5-1 part of defoaming agent, 1-2 parts of thickening agent and 1-2 parts of dispersing agent.
2. The construction method for resisting cracking of a wall body according to claim 1, wherein when the wall body exceeds 6m, the calculation formula of the width of the stress release seam is as follows:
the width of the stress-relief crack is (wall length × shrinkage value + width of a crack generated by pressure due to deflection of the beam) × 1.2.
3. The construction method for resisting crack of a wall body according to claim 1, wherein when the building exceeds 100m, the calculation formula of the width of the stress release seam is as follows:
the width of the stress-relief crack is (wall length × shrinkage value + pressure-induced crack width due to beam deflection + high-rise displacement coefficient × 0.5%) × 1.2.
4. The method of claim 1, wherein the applying the coating comprises: and fully putty-coating the base surface with the high-elasticity fiber putty.
5. The construction method for crack resistance of the wall body according to claim 1, wherein the drying shrinkage value of the wallboard is 0.01-0.03 mm/m.
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| CN114991400A (en) * | 2022-05-26 | 2022-09-02 | 珠海十字门中央商务区建设控股有限公司 | Seam-splicing interface closing construction method for different materials |
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| CN104775541B (en) * | 2015-04-16 | 2017-01-04 | 重庆建工第三建设有限责任公司 | During Light trabs is installed, plate stitches and the crack resistence processing method of Ban Mian basic unit |
| CN104746772B (en) * | 2015-04-16 | 2017-01-25 | 重庆建工第三建设有限责任公司 | Ash concrete hollow partition board anti-cracking construction method |
| CN106639315A (en) * | 2016-10-19 | 2017-05-10 | 北京城建北方建设有限责任公司 | Anti-crack construction method for junction of plaster filler wall and fair-faced concrete wall |
| CN106675149A (en) * | 2016-12-26 | 2017-05-17 | 沪宝新材料科技（上海）股份有限公司 | Double-component external wall heat-insulating putty having water resistance effect and preparation method thereof |
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2018
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