CN112079596B - Reinforcing and repairing method suitable for wall cracks - Google Patents
Reinforcing and repairing method suitable for wall cracks Download PDFInfo
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- CN112079596B CN112079596B CN202010865110.XA CN202010865110A CN112079596B CN 112079596 B CN112079596 B CN 112079596B CN 202010865110 A CN202010865110 A CN 202010865110A CN 112079596 B CN112079596 B CN 112079596B
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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
- 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
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- Materials Engineering (AREA)
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- Civil Engineering (AREA)
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Abstract
The application relates to a reinforcement repairing method suitable for wall cracks, which comprises the following steps: s1, pretreatment of a crack surface layer; s2, crack filling and repairing; s3, crack interface treatment; s4, interface plastering treatment; and S5, performing wall plastering treatment, wherein the repairing agent comprises the following components in parts by weight: 15-20 parts of epoxy resin, 30-35 parts of methyl methacrylate, 28-32 parts of ethyl methacrylate, 55-65 parts of diluent and 40-60 parts of inorganic activated filler; the plastering mortar comprises the following components in parts by weight: 30-40 parts of cement, 58-62 parts of quartz sand, 0.15-0.25 part of cellulose ether, 2-3 parts of redispersible polymer latex powder and 0.15-0.25 part of water repellent; the plastering mortar comprises the following components in parts by weight: 30-40 parts of cement, 58-62 parts of quartz sand, 0.15-0.25 part of cellulose ether, 2-3 parts of redispersible polymer latex powder and 0.15-0.25 part of water repellent. The application has the effect of improving the wall crack repair strength and the anti-permeability performance after crack repair.
Description
Technical Field
The application relates to the technical field of wall repair engineering, in particular to a reinforcing and repairing method suitable for wall cracks.
Background
Due to the brittleness of the concrete structure, cracking is usually inevitably generated in engineering application, and the cracking causes the water tightness of the concrete structure to be reduced and leaked, influences the service life of the engineering and even can not be normally used. The main causes of cracks in the concrete structure are caused by deformation, including shrinkage, expansion, uneven settlement and the like caused by temperature and humidity changes; the other is caused by external load direct stress. At present, the traditional method for repairing concrete cracks is to adopt water-based adhesive to mix cement for repairing, but the existing anti-leakage repairing standard is difficult to achieve. Therefore, a repair method with high crack repair strength and excessive leakage prevention is required to be developed.
Disclosure of Invention
In order to improve the repair strength of wall cracks and the anti-permeability performance after the cracks are repaired, the application provides a reinforcement repair method suitable for the wall cracks.
The application provides a reinforcement repair method suitable for wall cracks, which adopts the following technical scheme:
a reinforcement repairing method suitable for wall cracks comprises the following steps:
s1, crack surface layer pretreatment: chiseling a crack surface layer along the crack direction of the wall body, exposing a concrete layer inside the crack surface layer, polishing the edges of the crack to be flat, and removing the cracks and floating ash on the exposed concrete layer;
s2, crack filling and repairing: uniformly filling the repairing agent into the whole crack along the crack, and filling the crack to be flush with the exposed concrete layer;
s3, crack interface treatment: wetting the exposed concrete layer with clear water, and uniformly coating the cracks and the outer layer of the exposed concrete layer with an interfacial agent when the surface moisture of the concrete layer is controlled to be dry to form a crack interface layer;
s4, interface plastering treatment: uniformly coating plastering mortar outside the crack interface layer to form a plastering layer;
s5, wall plastering treatment: and (8) after the plastering layer is dried in the step S4, uniformly smearing the plastering mortar on the outer surface of the plastering layer, so that the whole wall surface is kept flat.
By adopting the technical scheme, the loose part of the crack edge can be removed by chiseling the crack surface layer, the recessive crack can also be chiseled, and the grinding and dust removal can reduce the influence of dust on the bonding effect of the repairing agent and ensure the repairing quality; the muddy soil layer is fully wetted, so that the adhesion effect of the interfacial agent can be improved, and a better interfacial solidification effect is achieved; in the interface plastering, plastering mortar is utilized to form a new mortar interface layer, so that the effect of repairing and reinforcing the chiseled interface is achieved; the plastering treatment is to carry out leveling modification on the outer surface of the wall body, further reduce pores and depressions and improve the smoothness and the flatness of the wall surface.
Preferably, in the step S4, the plastering mortar and the water are uniformly mixed according to the reference mass ratio of 1: 0.15-0.25.
By adopting the technical scheme, the plastering mortar and the water are mixed according to a certain proportion, so that the plastering mortar is fully and uniformly mixed, all components in the plastering mortar are fully dispersed and mixed, full activation is achieved, and the improvement of the plastering effect of a plastering surface is facilitated.
Preferably, in the step S5, the plastering mortar and the water are uniformly mixed according to the reference mass ratio of 1: 0.15-0.25.
By adopting the technical scheme, the plastering mortar is mixed with water according to a certain proportion, so that the plastering mortar is fully and uniformly mixed, all components in the plastering mortar are fully dispersed and mixed, full activation is achieved, and the plastering effect of a plastering layer is improved.
Preferably, the repairing agent comprises the following components in parts by weight: 15-20 parts of epoxy resin, 30-35 parts of methyl methacrylate, 28-32 parts of ethyl methacrylate, 55-65 parts of diluent and 40-60 parts of inorganic activated filler.
By adopting the technical scheme, the epoxy resin is used as the binder to play a main binding role, the methyl methacrylate and the ethyl methacrylate can further improve the binding effect of the repairing agent, the diluent can uniformly disperse all the components and fully contact and react in a diluent phase boundary, and the reaction activity and the reaction sufficiency are improved; the inorganic activated filler can be uniformly filled, the curing effect of the repairing agent is improved, the repairing strength of the crack is improved, and the anti-permeability effect of the repaired crack is improved.
Preferably, the inorganic activated filler comprises kaolin, mineral powder, reinforcing fibers and cement in a mass ratio of 1:1:1.5: 2.
By adopting the technical scheme, the kaolin is fine and soft, is high-quality clay, can be mixed with mineral powder and reinforcing fibers to wrap the mineral powder and the reinforcing fibers to form a repairing filler with stronger viscous repairing force, and forms a good synergistic effect with an activated component of cement to improve the repairing toughness of the repairing agent.
Preferably, the diluent is dibutyl phthalate.
By adopting the technical scheme, the dibutyl phthalate, the methyl methacrylate and the ethyl methacrylate form a uniformly dispersed mixed phase, so that the components can be fully contacted, the reaction activation efficiency is improved, and the field curing time of the repairing agent is shortened.
Preferably, the plastering mortar comprises the following components in parts by weight: 15-18 parts of cement, 8-15 parts of fly ash, 1-1.5 parts of polypropylene fiber, 1-1.5 parts of carbon fiber, 1.5-2.5 parts of thixotropic agent, 3.5-5 parts of redispersible polymer latex powder, 0.3-1.2 parts of accelerator, 0.02-0.03 part of water reducer and 50-65 parts of quartz sand.
By adopting the technical scheme, cement and fly ash form a mixed gel system, polypropylene fibers and carbon fibers are dispersed in the mixed gel system, and the polypropylene fibers and the carbon fibers are interwoven with each other to form a space network structure and are wrapped by the gel system, so that the connection strength and the tear strength in the gel system are increased, the rheological viscosity of plastering mortar is adjusted by the thixotropic agent, the dripping and sagging of the plastering mortar are reduced, the solidification speed of the mortar can be adjusted by the quick-setting agent according to the field requirement, the water consumption of the field mortar to water can be reduced by the water reducing agent, and the efficiency of field batching is improved; the latex powder and the quartz sand can be uniformly filled in the plastering mortar in a case-by-case manner, which is beneficial to improving the internal friction of the mortar and promoting the mixing uniformity of all components when the mortar is mixed.
Preferably, the plastering mortar comprises the following components in parts by weight: 30-40 parts of cement, 58-62 parts of quartz sand, 0.15-0.25 part of cellulose ether, 2-3 parts of redispersible polymer latex powder and 0.15-0.25 part of water repellent.
By adopting the technical scheme, cement forms a mixed gel system, after cellulose ether is dissolved in water, the effective and uniform distribution of a cementing material in the system is ensured due to the surface activity, and the cellulose ether is used as a protective colloid to 'wrap' solid particles and form a layer of lubricating film on the outer surface of the solid particles, so that a mortar system is more stable, and the fluidity of the mortar in the stirring process and the smoothness of construction are improved; the cellulose ether solution enables the water in the mortar not to be lost easily due to the characteristics of the molecular structure of the cellulose ether solution, and the water is released gradually in a long period of time, so that the mortar is endowed with good water retention and workability; the quartz sand and the redispersible polymer emulsion powder are used as fillers, which is beneficial to improving the compressive strength of the plastering mortar.
Preferably, in the step S3, before the interface agent is coated, a steel wire mesh is fixed on the outer surface of the crack and the exposed concrete surface layer.
By adopting the technical scheme, the steel wire mesh can increase the connecting sites between the interface agent and the cracks and between the interface agent and the concrete surface layer, and the interface effect of the interface agent is improved; on the other hand, the steel wire mesh can also improve the crack resistance of repaired cracks and interface layers.
Preferably, in the step S5, before plastering, a reinforcing fiber net is laid on the outer surface of the plastering mortar layer.
Through adopting above-mentioned technical scheme, the fibre web is wrapped up between plastering mortar layer and plastering mortar layer, plays the effect that increases plastering mortar layer and plastering mortar layer joint strength and crack resistance intensity.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the loose part of the crack edge can be removed by chiseling the crack surface layer, the recessive crack is chiseled, and the grinding and dust removal can reduce the influence of dust on the bonding effect of the repairing agent and ensure the repairing quality; the muddy soil layer is fully wetted, so that the adhesion effect of the interfacial agent can be improved, and a better interfacial solidification effect is achieved; in the interface plastering, plastering mortar is utilized to form a new mortar interface layer, so that the effect of repairing and reinforcing the chiseled interface is achieved; the plastering treatment is to carry out leveling modification on the outer surface of the wall body, further reduce pores and depressions and improve the smoothness and the flatness of the wall surface;
2. the epoxy resin is used as a binder to play a main binding role, the methyl methacrylate and the ethyl methacrylate can further improve the binding effect of the repairing agent, the diluent can uniformly disperse all components and fully contact and react in a diluent phase boundary, and the reaction activity and the reaction sufficiency are improved; the inorganic activated filler can be uniformly filled, the curing effect of the repairing agent is improved, the repairing strength of the crack is improved, and the anti-permeability effect of the repaired crack is improved;
3. in the plastering mortar, cement and fly ash form a mixed gel system, polypropylene fibers and carbon fibers are dispersed in the mixed gel system, and the polypropylene fibers and the carbon fibers are interwoven with each other to form a space network structure and are wrapped by the gel system, so that the connection strength and the tear strength in the gel system are increased, the rheological viscosity of the plastering mortar is adjusted by a thixotropic agent, the dripping and sagging of the plastering mortar are reduced, a setting accelerator can adjust the solidification speed of the mortar according to the field requirement, a water reducing agent can reduce the water consumption of the field mortar, and the field batching efficiency is improved; the latex powder and the quartz sand can be uniformly filled in the plastering mortar in a case by case, so that the internal friction of the mortar is improved, and the mixing uniformity of all components during the mixing of the mortar is promoted;
4. in the plastering mortar, cement forms a mixed gel system, after cellulose ether is dissolved in water, the effective and uniform distribution of a cementing material in the system is ensured due to the surface activity, and the cellulose ether is used as a protective colloid to 'wrap' solid particles and form a layer of lubricating film on the outer surface of the solid particles, so that the mortar system is more stable, and the fluidity of the mortar in the stirring process and the smoothness of construction are improved; the cellulose ether solution enables the water in the mortar not to be lost easily due to the characteristics of the molecular structure of the cellulose ether solution, and the water is released gradually in a long period of time, so that the mortar is endowed with good water retention and workability; the quartz sand and the redispersible polymer emulsion powder are used as fillers, which is beneficial to improving the compressive strength of the plastering mortar.
Detailed Description
The present application will be described in further detail with reference to examples.
Example 1
A reinforcement repairing method suitable for wall cracks comprises the following steps:
s1, crack surface layer pretreatment: chiseling a crack surface layer along the crack direction of the wall body, exposing a concrete layer inside the crack surface layer, polishing the edges of the crack to be flat, and removing the cracks and floating ash on the exposed concrete layer;
s2, crack filling and repairing: uniformly filling the repairing agent into the whole crack along the crack, and filling the crack to be flush with the exposed concrete layer;
s3, crack interface treatment: wetting the exposed concrete layer with clear water, fixing a layer of steel wire mesh on the outer surfaces of the cracks and the exposed concrete surface layer when the moisture on the surface of the concrete layer is controlled to be dry, uniformly coating the cracks and the exposed concrete surface layer with an interfacial agent, and covering the steel wire mesh to form a crack interface layer;
s4, interface plastering treatment: uniformly mixing plastering mortar and water according to the mass ratio of 1:0.15, and uniformly coating the plastering mortar outside the crack interface layer to form a plastering layer;
s5, wall plastering treatment: uniformly mixing the plastering mortar and water according to the mass ratio of 1:0.15, after the plastering layer is dried in the step S4, paving a reinforcing fiber net on the outer surface of the plastering mortar layer, and then uniformly smearing the plastering mortar on the outer surface of the plastering layer to keep the whole wall surface flat;
the repairing agent comprises the following components in parts by weight: 15 parts of epoxy resin, 30 parts of methyl methacrylate, 28 parts of ethyl methacrylate, 55 parts of dibutyl phthalate diluent, and 40 parts of inorganic activated filler consisting of kaolin, mineral powder, reinforcing fiber and cement in a mass ratio of 1:1:1.5: 2;
the plastering mortar comprises the following components in parts by weight: 15 parts of cement, 8 parts of fly ash, 1 part of polypropylene fiber, 1 part of carbon fiber, 1.5 parts of thixotropic agent, 3.5 parts of redispersible polymer latex powder, 0.3 part of accelerating agent, 0.02 part of water reducing agent and 50 parts of quartz sand; the plastering mortar comprises the following components in parts by weight: 30 parts of cement, 58 parts of quartz sand, 0.15 part of cellulose ether, 2 parts of redispersible polymer latex powder and 0.15 part of water repellent.
Example 2
A reinforcement repairing method suitable for wall cracks comprises the following steps:
s1, crack surface layer pretreatment: chiseling a crack surface layer along the crack direction of the wall body, exposing a concrete layer inside the crack surface layer, polishing the edges of the crack to be flat, and removing the cracks and floating ash on the exposed concrete layer;
s2, crack filling and repairing: uniformly filling the repairing agent into the whole crack along the crack, and filling the crack to be flush with the exposed concrete layer;
s3, crack interface treatment: wetting the exposed concrete layer with clear water, fixing a layer of steel wire mesh on the outer surfaces of the cracks and the exposed concrete surface layer when the moisture on the surface of the concrete layer is controlled to be dry, uniformly coating the cracks and the exposed concrete surface layer with an interfacial agent, and covering the steel wire mesh to form a crack interface layer;
s4, interface plastering treatment: uniformly mixing plastering mortar and water according to the mass ratio of 1:0.18, and uniformly coating the plastering mortar outside the crack interface layer to form a plastering layer;
s5, wall plastering treatment: uniformly mixing the plastering mortar and water according to the mass ratio of 1:0.18, after the plastering layer is dried in the step S4, paving a reinforcing fiber net on the outer surface of the plastering mortar layer, and then uniformly smearing the plastering mortar on the outer surface of the plastering layer to keep the whole wall surface flat;
the repairing agent comprises the following components in parts by weight: 17 parts of epoxy resin, 30-35 parts of methyl methacrylate, 28-32 parts of ethyl methacrylate, 58 parts of dibutyl phthalate diluent, and 45 parts of inorganic activated filler consisting of kaolin, mineral powder, reinforcing fibers and cement in a mass ratio of 1:1:1.5: 2;
the plastering mortar comprises the following components in parts by weight: 16 parts of cement, 10 parts of fly ash, 1.2 parts of polypropylene fiber, 1.2 parts of carbon fiber, 1.8 parts of thixotropic agent, 4 parts of redispersible polymer latex powder, 0.6 part of accelerating agent, 0.02 part of water reducing agent and 58 parts of quartz sand;
the plastering mortar comprises the following components in parts by weight: 33 parts of cement, 59 parts of quartz sand, 0.18 part of cellulose ether, 2.5 parts of redispersible polymer latex powder and 0.18 part of water repellent.
Example 3
A reinforcement repairing method suitable for wall cracks comprises the following steps:
s1, crack surface layer pretreatment: chiseling a crack surface layer along the crack direction of the wall body, exposing a concrete layer inside the crack surface layer, polishing the edges of the crack to be flat, and removing the cracks and floating ash on the exposed concrete layer;
s2, crack filling and repairing: uniformly filling the repairing agent into the whole crack along the crack, and filling the crack to be flush with the exposed concrete layer;
s3, crack interface treatment: wetting the exposed concrete layer with clear water, fixing a layer of steel wire mesh on the outer surfaces of the cracks and the exposed concrete surface layer when the moisture on the surface of the concrete layer is controlled to be dry, uniformly coating the cracks and the exposed concrete surface layer with an interfacial agent, and covering the steel wire mesh to form a crack interface layer;
s4, interface plastering treatment: uniformly mixing plastering mortar and water according to the mass ratio of 1:0.2, and uniformly coating the plastering mortar outside the crack interface layer to form a plastering layer;
s5, wall plastering treatment: uniformly mixing the plastering mortar and water according to the mass ratio of 1:0.2, after the plastering layer is dried in the step S4, paving a reinforcing fiber net on the outer surface of the plastering mortar layer, and then uniformly smearing the plastering mortar on the outer surface of the plastering layer to keep the whole wall surface flat;
the repairing agent comprises the following components in parts by weight: 19 parts of epoxy resin, 33 parts of methyl methacrylate, 30 parts of ethyl methacrylate, 62 parts of dibutyl phthalate diluent, and 58 parts of inorganic activated filler consisting of kaolin, mineral powder, reinforcing fiber and cement in a mass ratio of 1:1:1.5: 2;
the plastering mortar comprises the following components in parts by weight: 16 parts of cement, 13 parts of fly ash, 1.3 parts of polypropylene fiber, 1.3 parts of carbon fiber, 2 parts of thixotropic agent, 4.5 parts of redispersible polymer latex powder, 1.1 parts of accelerating agent, 0.03 part of water reducing agent and 63 parts of quartz sand;
the plastering mortar comprises the following components in parts by weight: 38 parts of cement, 60 parts of quartz sand, 0.2 part of cellulose ether, 3 parts of redispersible polymer latex powder and 0.2 part of water repellent.
Example 4
A reinforcement repairing method suitable for wall cracks comprises the following steps:
s1, crack surface layer pretreatment: chiseling a crack surface layer along the crack direction of the wall body, exposing a concrete layer inside the crack surface layer, polishing the edges of the crack to be flat, and removing the cracks and floating ash on the exposed concrete layer;
s2, crack filling and repairing: uniformly filling the repairing agent into the whole crack along the crack, and filling the crack to be flush with the exposed concrete layer;
s3, crack interface treatment: wetting the exposed concrete layer with clear water, fixing a layer of steel wire mesh on the outer surfaces of the cracks and the exposed concrete surface layer when the moisture on the surface of the concrete layer is controlled to be dry, uniformly coating the cracks and the exposed concrete surface layer with an interfacial agent, and covering the steel wire mesh to form a crack interface layer;
s4, interface plastering treatment: uniformly mixing plastering mortar and water according to the mass ratio of 1:0.25, and uniformly coating the plastering mortar outside the crack interface layer to form a plastering layer;
s5, wall plastering treatment: uniformly mixing the plastering mortar and water according to the mass ratio of 1:0.25, after the plastering layer is dried in the step S4, paving a reinforcing fiber net on the outer surface of the plastering mortar layer, and then uniformly smearing the plastering mortar on the outer surface of the plastering layer to keep the whole wall surface flat;
the repairing agent comprises the following components in parts by weight: 20 parts of epoxy resin, 35 parts of methyl methacrylate, 32 parts of ethyl methacrylate, 65 parts of dibutyl phthalate diluent, and 40-60 parts of inorganic activated filler consisting of kaolin, mineral powder, reinforcing fiber and cement in a mass ratio of 1:1:1.5: 2;
the plastering mortar comprises the following components in parts by weight: 18 parts of cement, 15 parts of fly ash, 1.5 parts of polypropylene fiber, 1.5 parts of carbon fiber, 2.5 parts of thixotropic agent, 5 parts of redispersible polymer latex powder, 1.2 parts of accelerating agent, 0.03 part of water reducing agent and 65 parts of quartz sand;
the plastering mortar comprises the following components in parts by weight: 40 parts of cement, 62 parts of quartz sand, 0.25 part of cellulose ether, 3 parts of redispersible polymer latex powder and 0.25 part of water repellent.
Performance testing
Linear shrinkage ratio: carrying out test determination according to JGJ/T70-2009 Standard test method for basic performance of building mortar;
cracking index: the method is carried out according to GB/T29417-2012 test method for drying shrinkage cracking performance of cement mortar and concrete;
breaking strength: measured according to GB/T50081-2002 Standard of test method for mechanical properties of common concrete;
compressive strength: the determination is carried out according to GB/T50081-2002 standard of test methods for mechanical properties of common concrete;
and (3) anti-permeability grade: the concrete is measured according to GB/T50082-2009 Standard test method for long-term performance and durability of ordinary concrete.
The above performance tests were carried out on the plastering mortars of examples 1 to 4, and the test results are shown in Table 1.
TABLE 1 performance testing of the finishing mortars of examples 1-4
| Measurement items | Example 1 | Example 2 | Example 3 | Example 4 |
| Linear shrinkage percentage% | 0.07 | 0.06 | 0.06 | 0.07 |
| Index of cracking | 2％ | 2％ | 3％ | 2％ |
| Flexural strength/MPa | 4.5 | 4.8 | 4.7 | 4.8 |
| 7d compressive strength/MPa | 5.0 | 4.9 | 4.8 | 4.9 |
| 28d compressive strength/MPa | 17.2 | 17.5 | 18.1 | 17.8 |
| Grade of impermeability | F300 | F300 | F300 | F300 |
As can be seen from table 1, the linear shrinkage rates of the finishing mortars of examples 1 to 4 are low and relatively close, which indicates that the finishing mortars of examples 1 to 4 of the present application have low shrinkage and good consolidation; the cracking indexes of the plastering mortars of the examples 1 to 4 are also at lower values, which shows that the plastering mortars prepared by the examples 1 to 4 have excellent cracking resistance; from the detection values of the flexural strength and the compressive strength, the plastering mortar of the embodiments 1 to 4 has excellent flexural strength and compressive strength; as can be seen from the determination of the impervious rating, the plastering mortars of examples 1 to 4 of the present application have excellent hydrophobicity and impervious performance.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. A reinforcement repairing method suitable for wall cracks is characterized by comprising the following steps:
s1, crack surface layer pretreatment: chiseling a crack surface layer along the crack direction of the wall body, exposing a concrete layer inside the crack surface layer, polishing the edges of the crack to be flat, and removing the cracks and floating ash on the exposed concrete layer;
s2, crack filling and repairing: uniformly filling the repairing agent into the whole crack along the crack, and filling the crack to be flush with the exposed concrete layer; the repairing agent comprises the following components in parts by weight: 15-20 parts of epoxy resin, 30-35 parts of methyl methacrylate, 28-32 parts of ethyl methacrylate, 55-65 parts of diluent and 40-60 parts of inorganic activated filler; the inorganic activation filling material comprises kaolin, mineral powder, reinforcing fibers and cement in a mass ratio of 1:1:1.5: 2; the diluent is dibutyl phthalate;
s3, crack interface treatment: wetting the exposed concrete layer with clear water, and uniformly coating the cracks and the outer layer of the exposed concrete layer with an interfacial agent when the surface moisture of the concrete layer is controlled to be dry to form a crack interface layer;
s4, interface plastering treatment: uniformly coating plastering mortar outside the crack interface layer to form a plastering layer; the plastering mortar comprises the following components in parts by weight: 15-18 parts of cement, 8-15 parts of fly ash, 1-1.5 parts of polypropylene fiber, 1-1.5 parts of carbon fiber, 1.5-2.5 parts of thixotropic agent, 3.5-5 parts of redispersible polymer latex powder, 0.3-1.2 parts of accelerator, 0.02-0.03 part of water reducer and 50-65 parts of quartz sand;
s5, wall plastering treatment: after the plastering layer is dried in the step S4, uniformly smearing the plastering mortar on the outer surface of the plastering layer to keep the whole wall surface flat; the plastering mortar comprises the following components in parts by weight: 30-40 parts of cement, 58-62 parts of quartz sand, 0.15-0.25 part of cellulose ether, 2-3 parts of redispersible polymer latex powder and 0.15-0.25 part of water repellent.
2. The method for repairing wall cracks in a reinforcing manner according to claim 1, wherein the method comprises the following steps: and in the step S4, uniformly mixing the plastering mortar and water according to the reference mass ratio of 1: 0.15-0.25.
3. The method for repairing wall cracks in a reinforcing manner according to claim 1, wherein the method comprises the following steps: and in the step S5, uniformly mixing the plastering mortar and water according to the reference mass ratio of 1: 0.15-0.25.
4. The method for repairing wall cracks in a reinforcing manner according to claim 1, wherein the method comprises the following steps: and S3, before coating the interface agent, fixing a layer of steel wire mesh on the outer surface of the crack and the exposed concrete surface layer.
5. The method for repairing wall cracks in a reinforcing manner according to claim 1, wherein the method comprises the following steps: in the step S5, before plastering, a reinforcing fiber net is laid on the outer surface of the plastering mortar layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010865110.XA CN112079596B (en) | 2020-08-25 | 2020-08-25 | Reinforcing and repairing method suitable for wall cracks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010865110.XA CN112079596B (en) | 2020-08-25 | 2020-08-25 | Reinforcing and repairing method suitable for wall cracks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112079596A CN112079596A (en) | 2020-12-15 |
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| CN112761376A (en) * | 2021-01-13 | 2021-05-07 | 广东碧通百年科技有限公司 | Mortar reinforcing and repairing method for wall settlement cracking |
| CN113511857A (en) * | 2021-04-23 | 2021-10-19 | 广东洛迪环保建筑材料有限责任公司 | Grouting type diatom ooze for repairing structural cracks of wall |
| CN113293797A (en) * | 2021-06-04 | 2021-08-24 | 千易建设集团有限公司 | Method for repairing concrete cracks |
| CN114180915B (en) * | 2021-12-31 | 2023-03-21 | 海南大学 | Polyethylene fiber reinforced ductile plastering mortar and preparation method thereof, and method for preventing assembled inner partition wall from cracking |
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| CN110028289A (en) * | 2019-05-13 | 2019-07-19 | 广东中星体育设施有限公司 | A kind of concrete pedestal solidifies the adhesive of reparation |
| KR20190100082A (en) * | 2019-07-26 | 2019-08-28 | 유지씨 주식회사 | A repair unit for repairing a detachment site or a crack site of a concrete building, and a repair or detachment site using the repair unit |
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