CN108569872B - Protective material and application of protective material as building surface protective layer and repairing building corrosion part - Google Patents

Protective material and application of protective material as building surface protective layer and repairing building corrosion part Download PDF

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CN108569872B
CN108569872B CN201810415560.1A CN201810415560A CN108569872B CN 108569872 B CN108569872 B CN 108569872B CN 201810415560 A CN201810415560 A CN 201810415560A CN 108569872 B CN108569872 B CN 108569872B
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protective material
coating
layer
construction
water
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CN108569872A (en
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张金良
苏茂林
尚宏琦
吴法辰
景来红
毛文然
杨林
陈学理
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Yellow River Engineering Consulting Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02Treatment
    • C04B20/023Chemical treatment
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62Insulation or other protection; Elements or use of specified material therefor
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00Working measures on existing buildings
    • E04G23/02Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0296Repairing or restoring facades
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482Coating or impregnation materials
    • C04B2111/00508Cement paints
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/23Acid resistance, e.g. against acid air or rain
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/27Water resistance, i.e. waterproof or water-repellent materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/72Repairing or restoring existing buildings or building materials

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  • Chemical & Material Sciences (AREA)
  • Architecture (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
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  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Building Environments (AREA)

Abstract

The invention discloses a protective material, which is prepared by mixing 100 parts of Portland cement, 100-250 parts of natural fine sand, 0.15-0.20 part of duralumin, 5 parts of a moisture migration inhibitor and 3-8 parts of metakaolin; the invention also discloses application of the protective material as a building surface protective layer and in repairing corrosion parts of a building. The protective material has the advantages of few raw material types, scientific and reasonable raw material proportion and grain size distribution, outstanding waterproof effect, capability of effectively preventing the concrete building from being corroded by water quality, convenient construction and great reduction of construction difficulty when being used as a repair material.

Description

Protective material and application of protective material as building surface protective layer and repairing building corrosion part
Technical Field
The invention relates to the field of building materials, in particular to a protective material for buildings, and also relates to application of the protective material as a building surface protective layer and for repairing corroded parts of buildings.
Background
The outer wall of the existing building needs to be constructed with a protective coating, some heat-insulating plates need to be laid on the outer wall, and the protective coating is constructed outside the heat-insulating plates.
For high-altitude cold mountainous areas (such as Ganzui in Sichuan province in China), the outer wall of a building generally needs to be laid with insulation board materials. In the area, the ultraviolet radiation is strong, the temperature difference between day and night reaches more than 30 ℃, the environmental condition is extremely severe, and protective measures need to be taken on the outer layer of the heat-insulation board. The ice and snow melting water in part of regions is rich, the water quality mineralization degree is low, and the water quality has heavy carbonic acid decomposition type and other corrosion on the cement-based material through detection. If the cement-based material is adopted as the outer layer protection measure of the insulation board, the insulation board is required to have stronger decomposition-resistant corrosion performance and frost resistance.
A certain hydropower station is built in Kokuku river basin in the western part of the republic of Guinea in Africa. Surface water (river water) in the dam site area of the hydropower station has corrosivity to concrete, and the corrosivity type is also medium corrosion of heavy carbonic acid decomposition type. At present, the upstream dam face of a hydropower station begins to be corroded, which is characterized by concrete mortar loss and serious aggregate exposure, particularly in a water level change area. In order to ensure a hundred years of engineering, the corroded area needs to be repaired. For this reason, a repair material resistant to decomposition-type corrosion is sought.
Most of the prior exterior wall protective layer materials comprise mortar such as common cement mortar and polymer mortar and organic coatings such as asphalt, epoxy, polyurea and the like. Common mortar materials belong to cement-based materials, have poor waterproof effect and are easy to deteriorate and damage under the condition of decomposition corrosion; the ageing resistance of the organic coating is poor, and the long-term performance of the organic coating is difficult to guarantee under severe conditions. For corroded parts, the repair construction difficulty is extremely high due to uneven surfaces, and bulges and punctures are easily caused.
Disclosure of Invention
The invention aims to provide a protective material, and also aims to provide an application of the protective material as a building surface protective layer and in repairing a corrosion part of a building.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the protective material is prepared by mixing portland cement, natural fine sand, duralumin fiber, a moisture migration inhibitor and metakaolin according to the following parts by weight: 100 parts of Portland cement, 100-250 parts of natural fine sand, 0.15-0.20 part of Durah fiber, 5 parts of a moisture migration inhibitor and 3-8 parts of metakaolin; wherein the water migration inhibitor is prepared by the following method:
firstly, grinding commercially available phlogopite powder or muscovite powder to 400-1000 meshes, and drying to obtain a base material for later use;
secondly, adding the substrate into alcohol for ultrasonic treatment, then adding a certain amount of silane coupling agent, dropwise adding hydrochloric acid solution with the mass fraction of 30% to adjust the pH value to 5.0, stirring for 30 minutes, performing suction filtration, and performing vacuum drying to obtain pre-treated powder for later use;
thirdly, adding a proper amount of n-butyl alcohol into the powder for ultrasonic treatment, then adding a cyclohexane-n-butyl alcohol mixed solution with the volume ratio of 1:1 into the mixed solution, dripping a proper amount of PDMS modifier, shearing and stirring at 60 ℃ for a certain time, drying at 150 ℃, grinding and sieving dry materials to obtain a finished product of the super-hydrophobic water migration inhibitor.
The grain size of the natural fine sand used in the invention is below 1.18mm, the mud content is less than 3%, and the water content is less than 0.2%; the nominal length of the Dula fiber is 20mm, and the equivalent diameter is 15-40 mu m; the portland cement is portland 42.5 cement.
The metakaolin used in the invention is commercial kaolin which is calcined at 750-800 ℃ and then ground to 500 meshes of fineness; in which SiO is present in the powder2>50%,Al2O3More than 40 percent, and the specific surface area is more than 15000m2/kg。
The preparation method of the protective material comprises the following steps: accurately weighing the raw materials according to the weight part ratio, then fully and uniformly mixing the raw materials in a mixer, weighing, bagging, sealing and storing.
When the protective material prepared by the invention is applied as a protective layer on the surface of a building, the construction method comprises the following steps:
first, interface pretreatment
When the coating is used for protecting the outer layer of the insulation board, the interface agent is sprayed on the insulation board half an hour before construction; when the method is used for protecting the surface of a newly-built concrete structure, a brush is used for dipping silicate 42.5 cement paste with a water-cement ratio of 0.50 for 3 days in advance to perform roughening treatment on the surface, a construction area is wetted by clear water, and an interface is kept in a wet but clear water-free state all the time in the whole construction process;
second step, slurry preparation
Uniformly mixing the protective material prepared by the invention and water according to the weight ratio of 100: 12-18 at the ambient temperature of not less than 5 ℃ to obtain slurry with the consistency meeting the construction requirement; note that the amount of water used should not generally exceed the upper limit;
third step, smearing
The first layer is coated with the thickness of 3mm +/-0.5 mm, and after construction is finished, a layer of glass fiber mesh cloth is covered; then, coating a second layer, wherein the coating thickness of the second layer is 4mm +/-0.5 mm, and the total thickness of the two layers is controlled not to exceed 8 mm; when in smearing, pressure is properly applied to strive for the compactness of a smearing layer;
the fourth step, maintenance
Rubbing the surface of the coating with wood on the next day after the coating; then spraying or film covering and maintaining, and keeping the surface moist within 7 days; after the seven-day maintenance is finished, starting a natural drying process, wherein the drying process needs 2-3 weeks according to different ambient temperatures and humidities; and forming the surface and internal super-hydrophobic effect.
When the protective material prepared by the invention is used for repairing the corroded part of a concrete building, the construction method comprises the following steps:
first, interface treatment
Cleaning loose corrosion products on the corrosion surface by using a high-pressure water gun, an electric hammer or other tools to expose a fresh concrete interface and keep the interface as flat as possible; if necessary, firstly finishing the structural reinforcement or the rust prevention treatment of the reinforcing steel bars; visual inspection of the maintained area ensures that the thickness of the product construction is at least 6 mm. Cleaning garbage, fragments or other impurities in a construction area by using a high-pressure water gun or other effective tools so as to clean a base surface and ensure the binding force of a product and concrete; wetting the construction area by using clear water, and keeping the base surface in a moist and clear water-free state in the construction process;
second step, slurry preparation
Under the environment temperature of not lower than 5 ℃, the protective material prepared by the invention and water are uniformly mixed according to the weight ratio of 100: 12-18 to obtain slurry with the consistency meeting the construction requirement, and the water consumption generally does not exceed the upper limit;
third step, smearing
Determining the number of coating layers according to the corrosion depth, when the corrosion thickness is more than 10mm, the coating thickness of the first layer is 5.5mm +/-0.5 mm, then the coating thickness of each layer is not more than 5mm, and covering a layer of glass fiber mesh cloth between the two coating layers; when the corrosion thickness is less than 10mm, only one layer of slurry can be coated without adding the grid cloth; similarly, when in coating, pressure is properly applied to strive for coating densification;
the fourth step, maintenance
Rubbing the surface of the coating with wood on the next day after the coating; then spraying or film covering and maintaining, and keeping the surface moist within 7 days; after the seven-day maintenance is finished, starting a natural drying process, wherein the drying process needs 2-3 weeks according to different ambient temperatures and humidities; and forming the surface and internal super-hydrophobic effect.
The performance indexes of the protective material are shown in the following table 1, and the table simultaneously lists the main requirements of the building material industry standard JC/T984-2005 on the polymer cement waterproof mortar in China. In order to reflect the resistance to heavy carbonic acid corrosion of the protective material according to the invention, the acid resistance tests are also specified in the table below. Namely, the protective material is soaked in 0.1mol/L dilute nitric acid for 48 hours after being hardened, and the surface is required to have no cracking or peeling.
TABLE 1 Performance index of the protective Material of the invention
Figure 98644DEST_PATH_IMAGE001
As can be seen from the table above, the performance index of the protective material can completely meet the requirements of JC/T984-2005. Meanwhile, the protective material is soaked in 0.1mol/L dilute nitric acid for 48 hours after being hardened, and the surface does not crack or peel off, so that the heavy carbonic acid corrosion resistance of the protective material can meet the actual use requirement.
The protective material has the advantages of few raw material types, scientific and reasonable raw material proportion and grain size distribution, outstanding waterproof effect, capability of effectively preventing the concrete building from being corroded by water quality, convenient construction and great reduction of construction difficulty when being used as a repair material.
Research shows that capillary adsorption is the main driving force for external aggressive water to enter the inside of the cement-based material. The super-hydrophobic material, namely the water migration inhibitor, prepared by adopting an organic-inorganic composite method can enable slurry to have super-hydrophobic performance after being added into a protective material, can form a super-hydrophobic effect on the surface and the inside of hardened slurry, reduces the adsorption of water, blocks the entry of external water, greatly relieves the adsorption of the slurry on corrosive water, and improves the corrosion resistance and the waterproof performance of the slurry material; meanwhile, a high-activity concrete admixture, namely a metakaolin raw material is added into the protective material, the metakaolin has the average particle size of 1-2 mu m, has excellent volcanic ash effect and filling effect, can effectively improve the acid erosion resistance of the material, and reduces self-shrinkage and drying shrinkage; most importantly, the metakaolin can adsorb a large amount of free water, greatly increases the viscosity of slurry, increases the bonding strength between the slurry and an interface, reduces bleeding and rough feeling of a plastering surface, and improves the construction difficulty of the plastering surface.
Drawings
FIG. 1 is a diagram showing the effect of a water-proof test performed on a protective material prepared in example 1 of the present invention and a commercially available polymer water-proof mortar.
Detailed Description
The present invention will be described in more detail with reference to the following examples.
Example 1
The protective material is prepared from 100g of silicate 42.5 cement; 200g of clean natural fine sand with the particle size of less than 1.18mm (the particle size can be adjusted within 150-250 g according to actual needs, the mud content is not more than 3 percent, and the water content is not more than 0.2 percent); the nominal length is 20mm, and the equivalent diameter is 0.15g of the Dula fiber with the diameter of 40 mu m; 5g of a water migration inhibitor; 5g of metakaolin;
wherein, the metakaolin is obtained by calcining commercial kaolin at 750-800 ℃, and then grinding the calcined metakaolin to 500 meshes of fineness; in order to ensure the using effect of the final protective material, SiO in metakaolin2Not less than 50% of Al2O3The content is not less than 40%, and the specific surface area is not less than 15000m2/kg。
In order to improve the waterproof performance of the finished protective material, the water migration inhibitor used by the invention is prepared by the following method:
firstly, grinding commercially available phlogopite powder or muscovite powder to 800 meshes, and drying to obtain a base material for later use;
secondly, adding 50g of base material into alcohol for ultrasonic treatment, then adding 3ml of KH-550 silane coupling agent, dropwise adding hydrochloric acid solution with the mass fraction of 30% to adjust the pH value to 5.0, stirring for 30 minutes, carrying out suction filtration, and carrying out vacuum drying to obtain pre-treated powder for later use;
thirdly, taking 50g of the pre-treated powder, adding 30ml of n-butyl alcohol, and carrying out ultrasonic treatment for 10 min; then adding 50ml of a cyclohexane-n-butanol mixed solution with the volume ratio of 1:1, slowly dripping 6ml of PDMS modifier under the stirring state, and shearing and stirring for 60min at the temperature of 60 ℃; and then drying the slurry at 150 ℃, grinding and sieving the dry material to obtain a finished product of the super-hydrophobic water migration inhibitor.
An insulation board with an area of 200mm multiplied by 200mm is taken as a test substrate:
mixing 1000g of the protective material prepared according to the proportion uniformly, adding 140ml of water at the room temperature of 20 ℃, and uniformly mixing to form coating slurry;
the insulation board is sprayed with a commercially available insulation board protective coating interface agent half an hour in advance; the smearing is carried out in two layers: the first layer is coated to a thickness of about 3mm, a layer of glass fiber mesh cloth is covered, then the second layer is coated, the coating thickness of the second layer is about 4mm, and the total thickness of the two layers is controlled not to exceed 8 mm; when in smearing, pressure is properly applied to strive for densification; rubbing the surface of the coating with wood on the next day after coating, then spraying or film covering and maintaining, and keeping the surface moist within 7 days; and after the seven-day maintenance is finished, naturally drying for 2 weeks.
FIG. 1 shows the comparative test results of the protective material prepared in example 1 and the commercial polymer mortar (the left side shows the waterproof effect of the protective material prepared by the present invention, and the right side shows the waterproof effect of the protective material prepared by the present invention), and the construction processes of the protective material and the commercial polymer mortar are the same. After the surface was dried, a dripping test was performed. As can be seen from the figure, the protective material prepared by the invention has very good waterproof effect compared with the commercial polymer mortar.
When the method is used for actual construction, amplification can be carried out according to the proportion.
Example 2
Repairing the corroded concrete, wherein the corrosive type is heavy carbonic acid decomposition type and the like. According to the actual conditions, a damaged concrete slab model is simulated and manufactured, the model shows that concrete mortar is lost, aggregates are exposed, and the corrosion depth is about 15 mm.
Preparing protective material slurry according to the proportion of example 1; and cleaning the corroded surface to expose a fresh concrete interface and keeping the interface as flat as possible. The interface is kept in a moist and clear water-free state in the construction process.
Coating three layers in total, wherein the coating thickness of the first layer is 5.5mm +/-0.5 mm, the coating thickness of each layer is 5mm, and a layer of glass fiber mesh cloth is covered between the two layers of coatings; when in coating, pressure is properly applied to strive for coating densification. The curing method after coating was the same as in example 1.
The protective material mortar prepared in example 1 was sampled and tested, and the test results are shown in table 2 below.
Table 2 test results of protective materials prepared in example 1 of the present invention
Figure 913017DEST_PATH_IMAGE002
According to the test results, the protective material prepared by the invention has the advantages of firm bonding, good waterproof performance, low water absorption, stronger decomposition corrosion resistance and frost resistance, and can completely meet the requirements of protecting the outer layer of the insulation board and repairing the corroded part of the building in alpine regions.

Claims (5)

1. A protective material characterized by: the mortar is prepared by mixing portland cement, natural fine sand, duralumin, a moisture migration inhibitor and metakaolin according to the following weight parts: 100 parts of Portland cement, 100-250 parts of natural fine sand, 0.15-0.20 part of Durah fiber, 5 parts of a moisture migration inhibitor and 3-8 parts of metakaolin; wherein the water migration inhibitor is prepared by the following method:
firstly, grinding commercially available phlogopite powder or muscovite powder to 400-1000 meshes, and drying to obtain a base material for later use;
secondly, adding 50g of base material into alcohol for ultrasonic treatment, then adding 3ml of silane coupling agent, dropwise adding hydrochloric acid solution with the mass fraction of 30% to adjust the pH value to 5.0, stirring for 30 minutes, and performing suction filtration and vacuum drying to obtain pretreated powder for later use;
and thirdly, adding 30ml of n-butyl alcohol into 50g of the previously processed powder, performing ultrasonic treatment, then adding 50ml of a cyclohexane-n-butyl alcohol mixed solution with the volume ratio of 1:1 into the mixed solution, dripping 6ml of a PDMS modifier, shearing and stirring at 60 ℃ for a certain time, drying at 150 ℃, grinding and sieving dry materials to obtain a finished product of the super-hydrophobic water migration inhibitor.
2. The protective material of claim 1, wherein: the particle size of the natural fine sand is less than 1.18mm, the mud content is less than 3%, and the water content is less than 0.2%; the nominal length of the Dula fiber is 20mm, and the equivalent diameter is 15-40 mu m; the portland cement is portland 42.5 cement.
3. The protective material of claim 1, wherein: the metakaolin is commercially available kaolin, calcined at the temperature of 750-800 ℃, and then ground to the fineness of 500 meshes; the powder contains more than 50% of SiO2, more than 40% of Al2O3 and more than 15000m2/kg of specific surface area.
4. When the protective material of claim 1 is applied as a surface protective layer of a building, the construction method comprises the following steps:
first, interface pretreatment
When the coating is used for protecting the outer layer of the insulation board, the interface agent is sprayed on the insulation board half an hour before construction; when the method is used for protecting the surface of a newly-built concrete structure, a brush is used for dipping cement paste with a water-cement ratio of 0.50 for roughening the surface 3 days in advance, the construction area is wetted by clear water, and the interface is kept in a wet but clear water state all the time in the whole construction process;
second step, slurry preparation
Uniformly mixing the prepared protective material and water according to the weight ratio of 100: 12-18 at the ambient temperature of not less than 5 ℃ to obtain slurry with the consistency meeting the construction requirement;
third step, smearing
The first layer is coated with the thickness of 3mm +/-0.5 mm, and after construction is finished, a layer of glass fiber mesh cloth is covered; then, coating a second layer, wherein the coating thickness of the second layer is 4mm +/-0.5 mm, and the total thickness of the two layers is controlled not to exceed 8 mm;
the fourth step, maintenance
Rubbing the surface of the coating with wood on the next day after the coating; then spraying or film covering and maintaining, and keeping the surface moist within 7 days; and naturally drying for 2-3 weeks after seven days.
5. When the protective material of claim 1 is used for repairing a corroded part of a concrete building, the construction method comprises the following steps:
first, interface treatment
Removing loose corrosion products on the corrosion surface, exposing a fresh concrete interface, keeping the interface smooth, and finishing the structural reinforcement or the anti-corrosion treatment of the reinforcing steel bars; wetting the construction area by using clear water, and keeping the base surface in a moist and clear water-free state in the construction process;
second step, slurry preparation
Uniformly mixing the prepared protective material and water according to the weight ratio of 100: 12-18 at the ambient temperature of not less than 5 ℃ to obtain slurry with the consistency meeting the construction requirement;
third step, smearing
Determining the number of coating layers according to the corrosion depth, when the corrosion thickness is more than 10mm, the coating thickness of the first layer is 5.5mm +/-0.5 mm, the thickness of each coating film is not more than 5mm, and a layer of glass fiber mesh cloth is covered between the two coating layers; when the corrosion thickness is less than 10mm, only one layer of slurry can be coated without adding the grid cloth;
the fourth step, maintenance
Rubbing the surface of the coating with wood on the next day after the coating; then spraying or film covering and maintaining, and keeping the surface moist within 7 days; and naturally drying for 2-3 weeks after seven days.
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CN101628799A (en) * 2009-07-08 2010-01-20 汕头经济特区龙湖科技有限公司 Economic anti-saltpetering inside and outside walls facing mortar
CN106812334A (en) * 2016-12-16 2017-06-09 国家电网公司 Concrete framework reinforcement
CN107098615A (en) * 2017-06-27 2017-08-29 黄河勘测规划设计有限公司 Concrete antifreezing antimitotic agent

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