CN112282415A - Repairing method for crack of thin-plastered external thermal insulation system - Google Patents
Repairing method for crack of thin-plastered external thermal insulation system Download PDFInfo
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- CN112282415A CN112282415A CN202011126650.2A CN202011126650A CN112282415A CN 112282415 A CN112282415 A CN 112282415A CN 202011126650 A CN202011126650 A CN 202011126650A CN 112282415 A CN112282415 A CN 112282415A
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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
- E04G23/0296—Repairing or restoring facades
Abstract
The invention provides a method for repairing cracks of a thin-plastered external thermal insulation system of an external thermal insulation facing layer. The thin-plastered external thermal insulation system for the external wall, which is maintained by the method of the invention, can prevent cracks from continuously developing, play roles in sealing and waterproofing, relieving stress and bonding and anchoring, can effectively prevent diseases such as continuous cracking, external facing layer falling and the like caused by stress conduction and water permeating into the wall body through the cracks, avoid the method of removing the original thermal insulation facing layer and then restoring the structure again, and ensure that the original thermal insulation layer is not damaged.
Description
Technical Field
The invention belongs to the field of buildings, and particularly relates to a method for repairing cracks of a thin-plastered external thermal insulation system.
Background
At present, an external wall external heat insulation system is widely applied in northern areas of China, and most of old houses are transformed into external wall external heat insulation old buildings. The external thermal insulation system of the external wall has mature technology and good thermal performance, is popularized and applied in the building thermal insulation engineering in various places on a large scale, but has a series of problems needing to be repaired in the subsequent use process of the building due to factors such as materials, construction, management, environment and the like. Among them, the crack problem of the plastering layer and the outer finishing layer of the thin-plastered outer wall external thermal insulation system is more and more emphasized.
The appearance of the micro cracks can cause the further expansion of the cracks, so that the whole wall body cracks, and the phenomena of the shedding of a decorative surface layer of an external thermal insulation system of the external wall, the aging of a thermal insulation layer and the like can be caused along with the invasion of external moisture, ultraviolet rays and other various corrosive media. The cracks affect the building appearance if the cracks are light, and affect the building energy-saving effect if the cracks are heavy, shorten the service life of the building and even cause safety accidents.
Therefore, the construction engineering of the thin-plastered external thermal insulation system with problems needs to be timely processed, reformed and repaired, so that the service life of the external thermal insulation system is prolonged.
Disclosure of Invention
In view of the above, the present invention is directed to a method for repairing cracks in a thin-plastered external thermal insulation system for an exterior wall, so as to solve the problems of stress conduction and continuous cracking and peeling of an exterior finish layer caused by moisture permeation into the wall through the cracks.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for repairing cracks of a thin-plastered external thermal insulation system is characterized by comprising the following steps: the method comprises the following steps:
s1: coating an elastic high-viscosity waterproof sealing material on the surface layer of the crack of the external heat-insulation decorative surface layer, so that part of the elastic high-viscosity waterproof sealing material penetrates into the crack;
s2: laying alkali-resistant anti-cracking mesh cloth on the elastic high-viscosity waterproof sealing material;
s3: and (3) thinly coating a layer of mortar on the alkali-resistant anti-cracking mesh cloth, pressing the alkali-resistant anti-cracking mesh cloth, and continuously coating the mortar.
Further, the construction area of the steps S1 and S3 is gradually reduced from one end close to the outer heat insulation layer to one end far away from the outer heat insulation layer.
Further, the elastic high-viscosity waterproof sealing material in S1 may be one or a mixture of two or more of asphalt-based waterproof roll sealing paste, modified asphalt waterproof paint, and non-cured rubber asphalt waterproof material.
Further, the application area of the elastic high-viscosity waterproof sealing material in S1 is 1-20cm beyond each side of the crack.
Furthermore, the paving area of the alkali-resistant anti-cracking mesh cloth in the S2 is 1-10cm away from the outer side of the elastic high-viscosity waterproof sealing material.
Further, the waterproof and anti-crack mortar in the S3 is prepared from cement, fly ash, river sand, waterproof rubber powder, cellulose, wood fiber and anti-crack fiber according to the weight ratio of 250-350: 50-200: 550-700: 15-40: 1.5-3: 1-3: 1-3.
Further, the waterproof rubber powder in the waterproof anti-crack mortar in the S3 adopts redispersible latex powder containing asphalt components, and the asphalt components account for 10-40% of the waterproof rubber powder by mass.
Further, the plastering area of the waterproof anti-crack mortar in the S3 is 1-5cm away from the outer side of the alkali-resistant anti-crack gridding cloth.
Further, the plastering thickness of the waterproof anti-crack mortar in the S3 is 1-3 mm.
The method avoids the method of removing the original heat-insulating decorative surface layer and then restoring the structure. The elastic coating can resist local deformation of the base layer, and the stress between the buffering facing layer and the heat insulating layer is generated due to different flexibility, different expansion with heat and contraction with cold and external stress. The existing crack to be repaired is used as a part for releasing stress concentration deformation, the crack is easy to reappear under repeated action, the elastic high-viscosity waterproof sealing material can reduce the possibility of reappearance and expansion of the crack by utilizing the buffer characteristic of the elastic high-viscosity waterproof sealing material, the crack is sealed in a waterproof manner, and meanwhile, the material has the property of slowly permeating into the crack and plays a role in filling the crack. The anti-cracking performance of the alkali-resistant mesh cloth is further improved by the structure of the alkali-resistant mesh cloth, and the capability of an outer heat insulation system for resisting crack expansion and wind load can be remarkably improved by combining the cement-based waterproof anti-cracking mortar with certain flexibility. In the outermost waterproof anti-cracking mortar layer, the bonding force with the elastic high-viscosity waterproof sealing layer can be obviously improved by adding the asphalt-based component, and meanwhile, asphalt is introduced into a cement mortar system, so that the cement material is endowed with waterproof, moistureproof and anticorrosive characteristics, the invasion of moisture is obviously avoided, the internal structure is protected, and the occurrence of diseases such as secondary cracking, peeling and the like of the finish coat is reduced. The thin-plastered external thermal insulation system for the external wall, which is maintained by the method of the invention, can prevent cracks from continuously developing, play roles in sealing and water prevention, stress relief and bonding and anchoring, and can effectively prevent diseases such as continuous cracking, external facing layer falling and the like caused by stress conduction and moisture permeating into the wall body through the cracks.
Compared with the prior art, the method for repairing the crack of the thin-plastered external thermal insulation system of the external wall has the following advantages:
(1) aiming at a heat insulation system with irregular crack defects, a method of coating a layer of elastic high-viscosity waterproof sealing material is adopted, dynamic microcracks can be effectively repaired, meanwhile, the elasticity and the non-curing effect of the sealing material can buffer the stress generated between a facing layer and a heat insulation layer due to different flexibility, difference of expansion with heat and contraction with cold and external stress, local deformation of a base layer is resisted, the probability that cracks at the repaired part occur again and expand due to stress concentration is reduced, and the viscous flow state during initial construction and the softening effect at high temperature can enable the sealing material to continuously and slowly permeate into the cracks after construction, so that good connection performance is achieved.
(2) The anti-cracking performance of the alkali-resistant mesh cloth is further improved by the structure of the alkali-resistant mesh cloth, and the capability of an outer heat insulation system for resisting crack expansion and wind load can be remarkably improved by combining the cement-based waterproof anti-cracking mortar with certain flexibility.
(3) The asphalt-based elastic high-viscosity waterproof sealing material is adopted, meanwhile, the waterproof anti-crack mortar adopts redispersible latex powder containing asphalt components, and a network structure of asphalt is formed in a cement framework through a cold construction technology of an asphalt material in a cement system, so that the cement material is endowed with waterproof, damp-proof and anti-corrosion characteristics, the durability such as frost resistance, impact resistance and the like is improved, and better bonding and waterproof effects can be achieved. And the composite double waterproof sealing effect can effectively prevent the invasion of water and other corrosive media, prevent the reduction of the bonding force between the self-plastering mortar of the heat preservation system and the heat preservation layer, and prevent the generation of hollowing, heat preservation layer aging and larger diseases.
(4) The waterproof anti-cracking mortar with certain flexibility is adopted, the elastic waterproof sealing material is sealed in the mortar to resist deformation stress of a base layer, and the wall around a crack is anchored and tensioned through the strength of the waterproof anti-cracking mortar, so that further cracking is prevented.
(5) The method of removing the original heat-insulating decorative surface layer and then restoring the structure is avoided, and the original heat-insulating layer is guaranteed not to be damaged. The construction is convenient, the cost is low, and the waterproof performance and the thermal performance of the existing external thermal insulation system can be effectively improved.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Description of reference numerals:
1-an insulating layer; 2-coating a surface layer; 3-a finishing layer; 4-cracking; 5-elastic high-viscosity waterproof sealing material; 6-alkali-resistant mesh cloth; 7-waterproof anti-crack mortar.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to the following examples and accompanying drawings.
First, an embodiment
Example 1
In this step, the BSR-242 asphalt-based coil sealer was applied 5cm wide on each side of the crack and 3cm long on the top of the crack.
And 2, paving an alkali-resistant anti-cracking mesh cloth on the BSR-242 type asphalt-based coiled material sealing paste, and firmly bonding the mesh cloth and the BSR-242 type asphalt-based coiled material sealing paste. In the step, the laying area of the alkali-resistant anti-cracking gridding cloth exceeds 3cm of the periphery of the elastic high-viscosity waterproof sealing material.
And 3, preparing the waterproof anti-crack mortar according to the following formula: 300 parts of P.O42.5 cement, 100 parts of fly ash, 570 parts of fine river sand of 40-70 meshes, 25 parts of waterproof rubber powder (the asphalt component accounts for 25 percent of the waterproof rubber powder), 2 parts of cellulose, 1.5 parts of wood fiber and 1.5 parts of polypropylene fiber. Uniformly stirring the waterproof anti-crack mortar by using an electric stirrer according to the required water consumption, thinly coating a layer of mortar on the alkali-resistant anti-crack gridding cloth, pressing the alkali-resistant anti-crack gridding cloth, and continuously coating the mortar. In the step, the plastering area of the waterproof anti-crack mortar exceeds 2cm of the periphery of the alkali-resistant anti-crack gridding cloth. The batch smearing thickness is 2 mm.
Example 2
In this step, the elastic high-viscosity waterproof sealing material was coated over 5cm on each side of the crack and 3cm over the top of the crack.
And 2, laying alkali-resistant anti-cracking gridding cloth on the elastic high-viscosity waterproof sealing material, wherein the gridding cloth is firmly bonded with the elastic high-viscosity waterproof sealing material. In the step, the laying area of the alkali-resistant anti-cracking gridding cloth exceeds 3cm of the periphery of the elastic high-viscosity waterproof sealing material.
And 3, preparing the waterproof anti-crack mortar according to the following formula: 300 parts of P.O42.5 cement, 100 parts of fly ash, 570 parts of fine river sand of 40-70 meshes, 40 parts of waterproof rubber powder (the asphalt component accounts for 25 percent of the waterproof rubber powder), 2 parts of cellulose, 1.5 parts of wood fiber and 1.5 parts of polypropylene fiber. Uniformly stirring the waterproof anti-crack mortar by using an electric stirrer according to the required water consumption, thinly coating a layer of mortar on the alkali-resistant anti-crack gridding cloth, pressing the alkali-resistant anti-crack gridding cloth, and continuously coating the mortar. In the step, the plastering area of the waterproof anti-crack mortar exceeds 2cm of the periphery of the alkali-resistant anti-crack gridding cloth, and the plastering thickness is 2 mm.
Comparative example 1
And 2, paving alkali-resistant anti-cracking mesh cloth. In the step, the laying width of the alkali-resistant anti-cracking gridding cloth is 3cm beyond each side of the crack, and the coating length is 3cm beyond the top end of the crack.
And 3, uniformly stirring the waterproof anti-crack mortar by using an electric stirrer according to the required water consumption, thinly coating a layer of mortar on the alkali-resistant anti-crack gridding cloth, pressing the alkali-resistant anti-crack gridding cloth, and continuously coating the mortar. In the step, the plastering area of the waterproof anti-crack mortar exceeds 2cm of the periphery of the alkali-resistant anti-crack gridding cloth. The batch smearing thickness is 2 mm. The formula of the waterproof anti-crack mortar comprises the following components: 300 parts of P.O42.5 cement, 100 parts of fly ash, 570 parts of fine river sand of 40-70 meshes, 25 parts of waterproof rubber powder (the asphalt component accounts for 25 percent of the waterproof rubber powder), 2 parts of cellulose, 1.5 parts of wood fiber and 1.5 parts of polypropylene fiber.
Uniformly stirring the waterproof anti-crack mortar by using an electric stirrer according to the required water consumption, thinly coating a layer of mortar on the alkali-resistant anti-crack gridding cloth, pressing the alkali-resistant anti-crack gridding cloth, and continuously coating the mortar. In the step, the plastering area of the waterproof anti-crack mortar exceeds 2cm of the periphery of the alkali-resistant anti-crack gridding cloth. The batch smearing thickness is 2 mm.
Comparative example 2
In this step, the BSR-242 asphalt-based coil sealer was applied 5cm wide on each side of the crack and 3cm long on the top of the crack.
And 2, paving an alkali-resistant anti-cracking mesh cloth on the BSR-242 type asphalt-based coiled material sealing paste, and firmly bonding the mesh cloth and the BSR-242 type asphalt-based coiled material sealing paste. In the step, the laying area of the alkali-resistant anti-cracking gridding cloth exceeds 3cm of the periphery of the elastic high-viscosity waterproof sealing material.
And 3, preparing the waterproof anti-crack mortar according to the following formula: 300 parts of P.O42.5 cement, 100 parts of fly ash, 570 parts of fine river sand of 40-70 meshes, 25 parts of VAE rubber powder, 2 parts of cellulose, 1.5 parts of wood fiber and 1.5 parts of polypropylene fiber.
Uniformly stirring the waterproof anti-crack mortar by using an electric stirrer according to the required water consumption, thinly coating a layer of mortar on the alkali-resistant anti-crack gridding cloth, pressing the alkali-resistant anti-crack gridding cloth, and continuously coating the mortar. In the step, the plastering area of the waterproof anti-crack mortar exceeds 2cm of the periphery of the alkali-resistant anti-crack gridding cloth, and the plastering thickness is 2 mm.
Comparative example 3
In this step, the coating width of the polymer emulsion exterior wall waterproofing paint is 5cm beyond each side of the crack, and the coating length is 3cm beyond the top of the crack.
And 2, laying alkali-resistant anti-cracking mesh cloth on the polymer emulsion exterior wall waterproof coating, and firmly bonding the mesh cloth and the polymer emulsion exterior wall waterproof coating. In the step, the laying area of the alkali-resistant anti-cracking gridding cloth is 3cm higher than the periphery of the polymer emulsion exterior wall waterproof coating material.
And 3, preparing the waterproof anti-crack mortar according to the following formula: 300 parts of P.O42.5 cement, 100 parts of fly ash, 570 parts of fine river sand of 40-70 meshes, 25 parts of waterproof rubber powder (the asphalt component accounts for 25 percent of the waterproof rubber powder), 2 parts of cellulose, 1.5 parts of wood fiber and 1.5 parts of polypropylene fiber. Uniformly stirring the waterproof anti-crack mortar by using an electric stirrer according to the required water consumption, thinly coating a layer of mortar on the alkali-resistant anti-crack gridding cloth, pressing the alkali-resistant anti-crack gridding cloth, and continuously coating the mortar. In the step, the plastering area of the waterproof anti-crack mortar exceeds 2cm of the periphery of the alkali-resistant anti-crack gridding cloth. The batch smearing thickness is 2 mm.
After the repair is completed, the comparative example and the examples are respectively tested, the base layer for testing is subjected to pre-top crack treatment in advance, and the test results are shown in table 1.
TABLE 1 Performance test Table
The test results of the examples and the comparative examples show that the dynamic cracking resistance can be obviously improved by compounding the elastic high-viscosity waterproof sealing material layer with the alkali-resistant mesh cloth, the reoccurrence and the expansion of cracks are avoided, and the surface water absorption of a system can be obviously reduced by compounding the elastic high-viscosity waterproof sealing material layer with the crack-resistant mortar layer prepared by adding the waterproof rubber powder of the asphalt component, the impermeability is improved, and the water intrusion is reduced. The multi-layer composite structure of the embodiment can improve the freeze-thaw resistance of the system more obviously.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for repairing cracks of a thin-plastered external thermal insulation system is characterized by comprising the following steps: the method comprises the following steps:
s1: coating an elastic high-viscosity waterproof sealing material on the surface layer of the crack of the external heat-insulation decorative surface layer, so that part of the elastic high-viscosity waterproof sealing material penetrates into the crack;
s2: laying alkali-resistant anti-cracking mesh cloth on the elastic high-viscosity waterproof sealing material;
s3: and (3) thinly coating a layer of mortar on the alkali-resistant anti-cracking mesh cloth, pressing the alkali-resistant anti-cracking mesh cloth, and continuously coating the mortar.
2. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: the construction area in the S1 and S3 is gradually reduced from one end close to the outer heat insulation layer to one end far away from the outer heat insulation layer.
3. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: the elastic high-viscosity waterproof sealing material in the S1 can be one or a mixture of two or more of asphalt-based waterproof coiled material sealing paste, modified asphalt waterproof paint and non-cured rubber asphalt waterproof material.
4. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: the coating area of the elastic high-viscosity waterproof sealing material in the S1 is 1-20cm beyond each side of the crack.
5. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: the laying area of the alkali-resistant anti-cracking mesh cloth in the S2 is 1-10cm away from the outer side of the elastic high-viscosity waterproof sealing material.
6. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: the waterproof anti-crack mortar in the S3 is prepared from cement, fly ash, river sand, waterproof rubber powder, cellulose, wood fiber and anti-crack fiber according to the weight ratio of 250-350: 50-200: 550-700: 15-40: 1.5-3: 1-3: 1-3.
7. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 6, wherein: the waterproof rubber powder in the waterproof anti-crack mortar in the S3 adopts redispersible latex powder containing asphalt components, and the asphalt components account for 10-40% of the waterproof rubber powder by mass.
8. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: and the plastering area of the waterproof anti-crack mortar in the S3 is 1-5cm away from the outer side of the alkali-resistant anti-crack gridding cloth.
9. The method for repairing the crack of the thin-plastered external thermal insulation system according to claim 1, wherein: the plastering thickness of the waterproof anti-cracking mortar in the S3 is 1-3 mm.
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