CN115724687B - Multicomponent material for repairing concrete cracks of cooling tower and construction method - Google Patents
Multicomponent material for repairing concrete cracks of cooling tower and construction method Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 80
- 239000004567 concrete Substances 0.000 title claims abstract description 56
- 238000010276 construction Methods 0.000 title claims abstract description 43
- 238000001816 cooling Methods 0.000 title claims abstract description 16
- 239000011344 liquid material Substances 0.000 claims abstract description 79
- 239000000843 powder Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004568 cement Substances 0.000 claims abstract description 31
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 16
- 239000000839 emulsion Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 10
- 229920001971 elastomer Polymers 0.000 claims abstract description 9
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 8
- 229910000272 alkali metal oxide Inorganic materials 0.000 claims abstract description 7
- 239000004925 Acrylic resin Substances 0.000 claims abstract description 6
- 229920000178 Acrylic resin Polymers 0.000 claims abstract description 6
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- 239000003513 alkali Substances 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 19
- 238000005507 spraying Methods 0.000 claims description 15
- 238000007790 scraping Methods 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000003755 preservative agent Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 230000002335 preservative effect Effects 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 7
- 239000000920 calcium hydroxide Substances 0.000 claims description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
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- 239000002585 base Substances 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 6
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- 239000000395 magnesium oxide Substances 0.000 claims description 6
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- 230000002829 reductive effect Effects 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000004111 Potassium silicate Substances 0.000 claims description 5
- PAZHGORSDKKUPI-UHFFFAOYSA-N lithium metasilicate Chemical compound [Li+].[Li+].[O-][Si]([O-])=O PAZHGORSDKKUPI-UHFFFAOYSA-N 0.000 claims description 5
- 229910052912 lithium silicate Inorganic materials 0.000 claims description 5
- 230000036961 partial effect Effects 0.000 claims description 5
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000004115 Sodium Silicate Substances 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000005977 Ethylene Substances 0.000 claims description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- 239000000084 colloidal system Substances 0.000 claims description 2
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- 239000010453 quartz Substances 0.000 claims description 2
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- 230000008439 repair process Effects 0.000 abstract description 17
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- 239000011259 mixed solution Substances 0.000 description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 4
- 239000006004 Quartz sand Substances 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 3
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- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
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- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 2
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 2
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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Abstract
The invention relates to a multicomponent material for repairing concrete cracks of a cooling tower and a method for repairing micro cracks, wherein the multicomponent material comprises the following components: a liquid material A, B, D and a powder material C; the compositions of the materials are as follows, if they are by weight: the liquid material A contains 50-70 parts of water, 3-10 parts of auxiliary agent and 20-40 parts of water-soluble silicate; the liquid material B contains 60-80 parts of water, 3-10 parts of auxiliary agent and 10-30 parts of strong alkali; the powder material C contains 50-70 parts of superfine cement, 20-40 parts of fine sand, 0.1-0.6 part of alkali metal oxide, 5-8 parts of acrylic resin powder, 1-5 parts of rubber powder and 0.5-3 parts of auxiliary agent; the liquid material D contains 43-45 parts of ethylene-vinyl acetate polymer emulsion, 1-2 parts of polyvinyl alcohol and 54-56 parts of water. The multi-component material is easy to construct, overcomes the problem of inconvenient construction in windy environment, has higher strength and flexibility, tolerance, stretching resistance and thermal stability at the repair part, is not easy to crack again due to environmental temperature change and other factors, and has good repair durability.
Description
Technical Field
The invention relates to a concrete crack repairing material, in particular to a multicomponent material for repairing concrete cracks of a cooling tower and a construction method.
Background
Concrete is used as a common elastoplastic material for buildings, high-speed rail slabs, dams, airports and the like, and can deform under the action of load or temperature and humidity, and mainly comprises elastic deformation, plastic deformation, shrinkage, temperature deformation and the like. Concrete meets some of the characteristics of elastic and plastic materials. Due to its own factors and the action of the external environment, some fine cracks can be generated. Once the cracks are formed, the cracks should be filled in time, otherwise, under the action of external environment, the cracks become larger gradually along with the time, under the influence of rainwater, vibration and other environments, the cracks are easy to expand and extend, and the conditions of leakage or steel bar corrosion and the like are easy to occur, so that the safe service life of the concrete of the cooling tower is influenced.
The concrete cracks can be classified into ultrafine cracks of 0.4mm or less and ultrafine cracks of 0.4m to 4mm according to the crack width. For superfine cracks, at present, organic resin emulsion materials are mainly used for filling and repairing, and epoxy resin emulsion, polyurea resin emulsion, polyurethane emulsion, acrylic polymer emulsion and the like are common. The emulsion has good fluidity and penetrability, can permeate into narrow concrete cracks, and mainly achieves the repairing function by exerting the film forming property and cohesiveness of the material.
However, these organic resin emulsion materials are only suitable for repairing very fine cracks, and if they are used for repairing fine cracks having a slit width of 0.4mm to 4mm, the effective repair time is often short and the effect is not ideal due to insufficient strength and environmental tolerance. In addition, after common materials such as acrylic emulsion and the like repair cracks, an airtight film can be formed, the outward diffusion of harmful water vapor in the concrete is restrained, and the concrete is easy to delaminate and crack for a long time (outdoors) and has poor durability. For cracks with a width of more than 0.4mm, repair is currently mainly performed by grouting. However, the grouting method has poor repairing effect on the micro cracks, because on one hand, the inorganic powder has larger particle size, is not easy to permeate into the micro cracks to effectively block the harmful capillary cracks, and has poor adhesion with the concrete base material, so that the repairing under the condition does not have firm root, only floats on the surface, and the combination of the inorganic powder and the micro cracks is not firm, and is easy to fall off again due to the corrosion of acid-base salt in the environment such as water vapor. On the other hand, the simple inorganic powder material is cured to form a rigid structure after grouting, the tensile resistance and the thermal stability are poor, and cracks are easy to crack again due to the change of the ambient temperature and the like.
The applicant previously proposed a patent application entitled "a two-component material for repairing micro-cracks of high-strength concrete" (issued with publication number CN 112321324B), which is mainly to wet the cracks with a liquid component a, then to coat a powder component B into the micro-cracks, then to spray the liquid component a into the micro-cracks, and finally to carry out curing. The method has the advantages of high mechanical strength and flexibility, high tolerance, high tensile resistance and high thermal stability, and is not easy to crack again due to the change of the ambient temperature and the like. However, the mode of coating the powder component to the crack is required, the requirements on the environmental conditions during construction are high, for example, the coating amount of the powder component and the retention amount of the powder component at the crack cannot be accurately ensured when the wind power is greater than 4 levels, and further, a good repairing effect cannot be ensured, and certain construction limitations exist. In addition, when the powder is sprayed/sprayed, the amount and compactness of the powder filled into the micro cracks are insufficient due to the extremely light powder, and the repairing effect is affected to a certain extent.
Therefore, a material and a using method which have wider application range and can effectively repair cracks with the width of 0.4mm to 4mm in cooling tower concrete are required to be developed.
Disclosure of Invention
First, the technical problem to be solved
In view of the defects and shortcomings of the prior art, the invention provides a multicomponent material for repairing concrete cracks of a cooling tower and a construction method, wherein during repairing construction, each component in a material bag is prepared and constructed according to requirements, so that cracks with the width of 0.4-4 mm in concrete can be effectively repaired, and the technical problem that the conventional crack repairing method is inconvenient to construct in windy environments is solved.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
in a first aspect, the present invention provides a multi-component material for repairing a cooling tower concrete crack, comprising: a liquid material A, B, D and a powder material C; the compositions of the materials are as follows, if they are by weight:
the liquid material A contains 50-70 parts of water, 3-10 parts of auxiliary agent and 20-40 parts of water-soluble silicate;
the liquid material B contains 60-80 parts of water, 3-10 parts of auxiliary agent and 10-30 parts of strong alkali;
the powder material C contains 50-70 parts of superfine cement, 20-40 parts of fine sand, 0.1-0.6 part of alkali metal oxide, 5-8 parts of acrylic resin powder, 1-5 parts of rubber powder and 0.5-3 parts of auxiliary agent;
the liquid material D contains 43-45 parts of ethylene-vinyl acetate polymer emulsion, 1-2 parts of polyvinyl alcohol and 54-56 parts of water.
According to the preferred embodiment of the invention, the auxiliary agent in the liquid material A is one or a combination of a plurality of penetrating agents, dispersing agents, preservatives and pH regulators; the water-soluble silicate is one or a combination of sodium silicate, potassium silicate and lithium silicate.
According to a preferred embodiment of the invention, in the liquid material B, the strong base is calcium hydroxide; the auxiliary agent is one or a combination of a plurality of penetrant, dispersant, preservative and pH regulator.
According to the preferred embodiment of the invention, in the powder material C, the superfine cement is PO42.5 or PI42.5 Portland cement, and the specific surface area is more than 450 square meters per Kg.
According to the preferred embodiment of the invention, in the powder material C, the grain diameter of fine sand is 80-630 mu m, and the fine sand is one or the combination of a plurality of heavy calcium carbonate, quartz powder and nano calcium carbonate and is used for improving the rigidity strength of the repairing part; the alkali metal oxide is one or the combination of two of calcium oxide and magnesium oxide, preferably magnesium oxide; the alkali metal oxide mainly plays a role of swelling to fill the gap.
According to a preferred embodiment of the present invention, in the powder material C, the rubber powder is one or a combination of several of ethylene/vinyl acetate copolymer (EVA), vinyl acetate/versatic acid ethylene copolymer, and acrylic acid copolymer, wherein the protective colloid is polyvinyl alcohol.
According to a preferred embodiment of the invention, in the powder material C, the auxiliary agent comprises a polycarboxylate water reducing agent, an accelerator and cellulose for enhancing strength.
In a second aspect, the present invention provides a construction method for repairing a concrete micro-crack of a cooling tower, wherein the repair construction is performed by using the multicomponent material according to any one of the above embodiments, and the construction steps are as follows:
s1, mixing the liquid materials A and B according to the volume ratio of 1:3-5 (preferably mixing according to the volume ratio of 1:4), and stirring until gel is formed;
s2, adding the gel in the step S1 into an accumulator atomizer, then injecting the gel into the micro cracks to be repaired by using the accumulator atomizer, and scraping off the gel overflowed from the micro cracks by using a scraper;
s3, after the gel is injected for the first time, observing for 20-50 minutes, and if the gel in the micro cracks is reduced and partial empty appears, then using an accumulator sprayer to supplement and inject the gel for the second time;
s4, mixing the liquid material A, the liquid material B, the powder material C and the liquid material D according to the proportion of 9-12mL:9-12mL:28-35g:2.5-3.5g, and stirring until a cement paste with uniform dispersion is obtained;
s5, filling the slurry into a caulking gun, filling the slurry into the micro cracks by using the caulking gun, compacting the slurry to the depth of the micro cracks by using a leveling tool, and finally scraping the overflowed slurry at the micro cracks by using a scraping plate;
after S6, 5-9 days, spraying was performed along the fine cracks using the liquid material a.
In S3 according to the preferred embodiment of the present invention, the gel is generally injected twice, but the number of times of the construction may be appropriately increased according to the degree of reduction of the gel in the micro cracks.
According to a preferred embodiment of the invention, in S6, the liquid material A is sprayed along the micro-cracks in an amount of 140-180 mL/square meter, preferably 150 mL/square meter.
(III) beneficial effects
The invention has the technical effects that:
(1) When repairing the micro cracks, firstly, injecting gel composed of a liquid material A and a liquid material B into the micro cracks, enabling active ingredients in the gel, including water-soluble silicate, strong alkali (preferably calcium hydroxide) and the like, to react with a concrete base surface to generate gel and crystals, on one hand, enabling reaction products to permeate into finer capillary holes on the inner side surface of the concrete cracks, enabling the gel to be tightly combined on the inner side surface of the concrete cracks, on the other hand, providing a large number of hydrophilic groups (silicate, -OH and the like) for the subsequent cement paste composed of materials A, B, C, D, providing a high-quality basic combination interface for the combination of inorganic powder in the paste, and realizing a rapid plugging effect. And then spraying the liquid material A, and further continuously reacting with unreacted active ingredients in the concrete and the slurry, and jointly playing a role with the slurry to seal the capillary joints remained on the surface of the cracks, thereby realizing the compact repair of the micro cracks.
(2) In the powder material C, fine sand is used as aggregate for improving the rigidity strength of the repair part, and alkali metal oxide mainly plays a role in expansion to fill and seal gaps; the rubber powder in the powder material is dissolved in a solvent, stirred and dispersed in slurry and then solidified to form a flexible network, so that the repaired part has good thermal stability; the auxiliary agent comprises a polycarboxylate water reducer, an accelerator and strength-enhancing fibers, and is used for controlling the solidification speed and enhancing the repair strength.
(3) According to the application method of the invention, the crack can be completely blocked only by one-time construction; firstly, gel formed by liquid materials A and B reacts with concrete at the inner side of a crack, crystals are generated to plug capillary holes, at the moment, rigid connection is formed between the gel and the interface of the concrete, active ingredients in the gel react with slurry, at the moment, the gel powder forms a flexible network, and inorganic materials such as silicate, calcium hydroxide, magnesium hydroxide and the like in the slurry form a rigid network with the gel; finally, spraying a liquid material A on the surface, and continuously reacting with unreacted active ingredients in the slurry to produce a rigid network. Therefore, a stable structure with interpenetrating rigid network structure and flexible network structure is formed at the micro cracks, so that the repairing part has higher strength and flexibility, tolerance, stretching resistance and thermal stability, is not easy to generate cracks again due to the factors such as the change of the ambient temperature, and has lasting repairing effect.
(4) In the repairing process, the gel is injected into the micro cracks to be repaired by the pressure accumulation sprayer, and the gel has fluidity and can be well injected into the micro cracks, and is not influenced by the environment such as strong wind; then, the slurry is filled into the micro cracks by using a caulking gun, and the slurry has fluidity and can well fill the micro cracks, and is not influenced by environmental strong wind and the like. Compared with the prior art, the method solves the problem of inconvenient construction in windy environment, and has good repairing effect.
Drawings
FIG. 1 is a schematic flow chart of a construction method for repairing a concrete micro-crack of a cooling tower.
Fig. 2 shows the liquid materials a and B according to the volume ratio 1 in example 1 of the present invention: 4 mixing and stirring the obtained gel.
Fig. 3 is a schematic illustration of gel injection into a fracture using a pressure accumulating atomizer.
FIG. 4 shows a cement paste obtained by mixing and stirring the liquid material A, the liquid material B, the powder material C and the liquid material D according to the proportion of 150mL:30g:3g in the embodiment 1 until the cement blocks are thoroughly dispersed.
Fig. 5 is a schematic diagram showing the spraying operation along the crack using the liquid material a after filling the crack with the cement paste for 1 week in example 1 of the present invention.
FIG. 6 shows the effect of natural outdoor 3 months after repair without cracking, falling off, etc.
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
As shown in FIG. 1, the invention provides a construction method for repairing a concrete micro-crack of a cooling tower, wherein the crack width of the micro-crack is 0.4mm-4mm, and the construction method cannot be constructed in rainy days. Before construction, cleaning crack parts, mixing a liquid material A and a liquid material B according to a preset proportion to obtain a mixed solution, stirring for 1-2min until a gel material is obtained, injecting gel into a micro crack to be repaired by using a pressure accumulation sprayer to serve as a repairing basal layer, on one hand, plugging a harmful capillary pore structure, fastening and combining the gel material inside a concrete crack, and on the other hand, activating the surface of the concrete, and providing a large number of hydrophilic groups for reaction and combination of subsequent slurry (composed of a liquid material A, B, D and a powder material C). The injection of the gel may be performed 2 times or more. After the first injection, waiting for 20-50min, observing whether the gel in the micro cracks is reduced (mainly due to water volatilization, bubble cracking, void part leakage and gel penetration into the deeper layer of the concrete), if so, and injecting the gel by using an accumulator sprayer. (Standard construction is 2 times, but the number of constructions can be increased appropriately according to the degree of reduction of gel)
After the gel injection construction is finished, mixing the liquid material A, the liquid material B, the powder material C and the liquid material D according to the proportion of 9-12mL:9-12mL:28-35g:2.5-3.5g, stirring until a cement paste (or called cement mortar) which is uniformly dispersed is obtained, filling the cement mortar into the micro cracks by using a caulking gun, pushing and pressing the cement paste on two sides of the micro cracks to the depth of the micro cracks by using a scraping plate, and finally scraping the cement paste overflowed from the micro cracks by using the scraping plate. After waiting for about 5-9 days, usually 7 days, spraying along the micro cracks by using a liquid material A, and reacting residual active ingredients in the cement mortar by using the liquid material A to generate crystals, so that capillary holes on the cement mortar are further plugged, and the effect of surface protection is achieved.
Example 1
The embodiment provides a construction method for repairing a concrete micro-crack of a cooling tower, which uses a multicomponent material package for repairing construction, wherein the multicomponent material comprises the following components: a liquid material A, B, D and a powder material C. The compositions of the materials are as follows:
the liquid material a contains: 62 parts of water, 1.5 parts of pH regulator (the pH is regulated to be more than or equal to 12), 1 part of sodium hexametaphosphate, 1 part of special preservative for concrete, 3 parts of triethanolamine (penetrating agent), 24 parts of potassium silicate and 6 parts of lithium silicate.
The liquid material B contains: 62 parts of water, 1 part of sodium hexametaphosphate, 1 part of special preservative for concrete, 3 parts of triethanolamine (penetrating agent) and 15 parts of calcium hydroxide.
The powder material C contains: 64 parts of PO42.5 superfine Portland cement (the specific surface area is more than or equal to 450 square meters per Kg), 25 parts of fine sand (quartz sand, 100-300 mu m), 0.5 part of magnesium oxide, 6 parts of acrylic resin powder, 3 parts of EVA rubber powder, 0.5 part of polycarboxylate water reducer, 0.3 part of accelerator (aluminum sulfate salt) and 0.4 part of HPMC.
The liquid material D contains: 44 parts of ethylene-vinyl acetate polymer emulsion, 2 parts of polyvinyl alcohol and 55 parts of water.
Before construction, a concrete slab is manufactured, a crack with the gap width of 0.4mm-4mm is artificially formed, the surface of the concrete slab is wiped by a rag, and the crack is ready to be repaired. The construction steps are as follows:
(1) Liquid materials a and B were mixed in a volume ratio of 1:4, and then the mixed solution was stirred using a bubbler for 1-2 minutes until gel was formed. As shown in fig. 2, a white gel.
(2) The gel is added into a pressure accumulating sprayer, then the gel is injected into the cracks by using the pressure accumulating sprayer, and then the spilled gel at the cracks is cleaned by using a scraping plate. As shown in fig. 3, the gel is sprayed into the cracks of the concrete base surface by the pressure accumulating sprayer.
(3) Observing for 30 minutes after the gel is injected for the first time, and if the gel in the micro cracks is reduced and partial empty appears, then using an accumulator sprayer to supplement and inject the gel for the second time; the standard construction was 2 times, but the number of constructions can be appropriately increased according to the degree of reduction of the gel.
(4) 150ml of liquid material A:150ml of liquid material B:450g of powder material C:45g of liquid material D are mixed and stirred until the cement blocks are thoroughly dispersed, and cement paste with uniform dispersion is obtained. As shown in the figure 4, the cement paste is fine, soft, good in fluidity and easy to fill by using a caulking gun.
(5) And injecting and filling the cement paste into the micro cracks treated by the gel by adopting a caulking gun, pressing the mortar into the cracks by using tools such as a scraper, and cleaning the overflowed mortar at the cracks by using tools such as the scraper.
(6) After 7 days, spraying along the cracks by using a liquid material A, wherein the spraying amount is 150mL/m 2 . Fig. 5 shows a schematic diagram of spraying back and forth along the repaired micro-cracks using a spray bottle containing liquid material a.
As shown in fig. 6, after the repair of the micro cracks repaired by the method, the concrete test panel was left outdoors for 3 months, and after inspection, the concrete test panel was touched by hand, and no cracking, falling off and the like occurred. The test board is soaked in hot water at 80 ℃ for overnight, and the seam width of the test board is detected the next day, so that the phenomenon of increase, cracking and falling of repair materials in the seam and the like are avoided.
Example 2
The embodiment provides a construction method for repairing a concrete micro-crack of a cooling tower, which uses a multicomponent material package for repairing construction, wherein the multicomponent material comprises the following components: a liquid material A, B, D and a powder material C. The compositions of the materials are as follows:
the liquid material a contains: 70 parts of water, 2 parts of pH regulator (the pH is regulated to be more than or equal to 12), 1.5 parts of sodium tripolyphosphate, 1 part of special preservative for concrete, 4 parts of polyvinyl chloride (penetrating agent), 20 parts of potassium silicate, 10 parts of lithium silicate and 5 parts of sodium silicate.
The liquid material B contains: 80 parts of water, 1.5 parts of sodium tripolyphosphate, 1 part of special preservative for concrete, 3 parts of polyvinyl chloride (penetrating agent), 15 parts of calcium hydroxide and 2 parts of sodium hydroxide.
The powder material C contains: 70 parts of PO42.5 superfine Portland cement (the specific surface area is more than or equal to 450 square meters per Kg), 28 parts of fine sand (quartz sand, 100-300 mu m), 0.4 part of magnesia, 8 parts of acrylic resin powder, 4 parts of EVA rubber powder, 0.6 part of polycarboxylate water reducer, 0.2 part of accelerator (aluminum sulfate) and 0.5 part of HPMC.
The liquid material D contains: 43 parts of ethylene-vinyl acetate polymer emulsion, 1.5 parts of polyvinyl alcohol and 54 parts of water.
Before construction, a concrete slab is manufactured, a crack with the gap width of 0.4mm-4mm is artificially formed, the surface of the concrete slab is wiped by a rag, and the crack is ready to be repaired. The construction steps are as follows:
(1) Liquid materials a and B were mixed in a volume ratio of 1:5, and then the mixed solution was stirred using a bubbler for 1-2 minutes until gel was formed.
(2) The gel is added into a pressure accumulating sprayer, then the gel is injected into the cracks by using the pressure accumulating sprayer, and then the spilled gel at the cracks is cleaned by using a scraping plate.
(3) Observing for 30 minutes after the gel is injected for the first time, and if the gel in the micro cracks is reduced and partial empty appears, then using an accumulator sprayer to supplement and inject the gel for the second time; the standard construction was 2 times, but the number of constructions can be appropriately increased according to the degree of reduction of the gel.
(4) 150ml of liquid material A:150ml of liquid material B:460g of powder material C:48g of liquid material D are mixed and stirred until the cement blocks are thoroughly dispersed, and cement paste with uniform dispersion is obtained.
(5) And injecting and filling the cement paste into the micro cracks treated by the gel by adopting a caulking gun, pressing the mortar into the cracks by using tools such as a scraper, and cleaning the overflowed mortar at the cracks by using tools such as the scraper.
(6) After 7 days, spraying along the cracks by using a liquid material A, wherein the spraying amount is 160mL/m 2 。
After the micro cracks repaired by the method are repaired, the concrete test board is placed outdoors for naturally placing for 3 months, and after inspection, the concrete test board is touched by hands, and has no cracking, falling off and other phenomena. The test board is soaked in hot water at 80 ℃ for overnight, and the seam width of the test board is detected the next day, so that the phenomenon of increase, cracking and falling of repair materials in the seam and the like are avoided.
Example 3
The embodiment provides a construction method for repairing a concrete micro-crack of a cooling tower, which uses a multicomponent material package for repairing construction, wherein the multicomponent material comprises the following components: a liquid material A, B, D and a powder material C. The compositions of the materials are as follows:
the liquid material a contains: 50 parts of water, 1 part of pH regulator (the pH is adjusted to be more than or equal to 12), 1 part of sodium pyrophosphate, 0.8 part of special preservative for concrete, 3 parts of fatty alcohol polyoxyethylene ether (penetrating agent), 20 parts of lithium silicate and 6 parts of potassium silicate.
The liquid material B contains: 60 parts of water, 1 part of sodium pyrophosphate, 1 part of special preservative for concrete, 3 parts of fatty alcohol polyoxyethylene ether and 12 parts of calcium hydroxide.
The powder material C contains: 50 parts of PO42.5 superfine Portland cement (the specific surface area is more than or equal to 450 square meters per Kg), 20 parts of quartz sand (the particle size is 100-300 mu m), 0.3 part of magnesia, 5 parts of acrylic resin powder, 3 parts of EVA rubber powder, 0.5 part of polycarboxylate water reducer, 0.1 part of accelerator (aluminum sulfate) and 0.4 part of HPMC.
The liquid material D contains: 43 parts of ethylene-vinyl acetate polymer emulsion, 1 part of polyvinyl alcohol and 54 parts of water.
Before construction, a concrete slab is manufactured, a crack with the gap width of 0.4mm-4mm is artificially formed, the surface of the concrete slab is wiped by a rag, and the crack is ready to be repaired. The construction steps are as follows:
(1) Liquid materials a and B were mixed in a volume ratio of 1:3, and then the mixed solution was stirred using a bubbler for 1-2 minutes until gel was formed.
(2) The gel is added into a pressure accumulating sprayer, then the gel is injected into the cracks by using the pressure accumulating sprayer, and then the spilled gel at the cracks is cleaned by using a scraping plate.
(3) Observing for 30 minutes after the gel is injected for the first time, and if the gel in the micro cracks is reduced and partial empty appears, then using an accumulator sprayer to supplement and inject the gel for the second time; the standard construction was 2 times, but the number of constructions can be appropriately increased according to the degree of reduction of the gel.
(4) 160ml of liquid material A:160ml of liquid material B:450g of powder material C:45g of liquid material D are mixed and stirred until the cement blocks are thoroughly dispersed, and cement paste with uniform dispersion is obtained.
(5) And injecting and filling the cement paste into the micro cracks treated by the gel by adopting a caulking gun, pressing the mortar into the cracks by using tools such as a scraper, and cleaning the overflowed mortar at the cracks by using tools such as the scraper.
(6) After 7 days, spraying along the cracks by using a liquid material A, wherein the spraying amount is 160mL/m 2 。
After the micro cracks repaired by the method are repaired, the concrete test board is placed outdoors for naturally placing for 3 months, and after inspection, the concrete test board is touched by hands, and has no cracking, falling off and other phenomena. The test board is soaked in hot water at 80 ℃ for overnight, and the seam width of the test board is detected the next day, so that the phenomenon of increase, cracking and falling of repair materials in the seam and the like are avoided.
Comparative example 1
This comparative example is based on the examples, without pretreatment with a gel consisting of liquid materials a and B, directly consisting of 150ml of liquid material a:150ml of liquid material B:450g of powder material C:45g of liquid material D are mixed and stirred until the cement blocks are thoroughly dispersed, and cement paste with uniform dispersion is obtained. Filling the cement paste into the cleaned micro cracks by using a caulking gun, pressing the mortar into the cracks by using tools such as a scraper, and cleaning the overflowed mortar at the cracks by using tools such as the scraper.
Comparative example 2
In the comparative example, on the basis of the example, after the powder material C is mixed into uniform cement paste by adding water, the cement paste is injected into and filled into micro cracks which are treated by gel by adopting a caulking gun, mortar is pressed into the cracks by using tools such as a scraper, and then the overflow mortar at the cracks is cleaned by using tools such as the scraper.
Comparative example 3
In this comparative example, the step (6) was not performed, i.e., the surface protection construction was performed along the crack spray without using the liquid material a, on the basis of the example.
The concrete test panels of comparative examples 1 to 3 were left outdoors together with the concrete test panel of example 1, left naturally for 3 months, and inspected for capillary gaps, pits and falling particles of the repair material. Then, the three concrete test boards are placed in hot water at 80 ℃ for soaking overnight, the seam width of the test boards is detected the next day, the seam width is increased, and the hand mould is provided with repairing materials to fall off. As a result, the repair sites of comparative examples 1 to 3 were inferior in heat stability, but in general, comparative example 3 was slightly better than comparative examples 1 to 2. Therefore, before the cement slurry is used for repairing the micro cracks, the cement slurry is filled after the gel treatment of the materials A and B, so that the repairing effect can be improved, and the environmental resistance of the repaired part can be improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A multi-component material for repairing a concrete crack of a cooling tower, comprising: a liquid material A, B, D and a powder material C; the compositions of the materials are as follows, if they are by weight:
the liquid material A contains 50-70 parts of water, 3-10 parts of auxiliary agent and 20-40 parts of water-soluble silicate;
the liquid material B contains 60-80 parts of water, 3-10 parts of auxiliary agent and 10-30 parts of strong alkali; the strong base is calcium hydroxide;
the powder material C contains 50-70 parts of superfine cement, 20-40 parts of fine sand, 0.1-0.6 part of alkali metal oxide, 5-8 parts of acrylic resin powder, 1-5 parts of rubber powder and 0.5-3 parts of auxiliary agent; the rubber powder is one or a combination of a plurality of ethylene/vinyl acetate copolymer, vinyl acetate/tertiary ethylene carbonate copolymer and acrylic acid copolymer which take polyvinyl alcohol as protective colloid;
the liquid material D contains 43-45 parts of ethylene-vinyl acetate polymer emulsion, 1-2 parts of polyvinyl alcohol and 54-56 parts of water.
2. The multicomponent material according to claim 1, wherein the auxiliary agent in the liquid material a is one or a combination of several of penetrant, dispersant, preservative and pH adjuster; the water-soluble silicate is one or a combination of sodium silicate, potassium silicate and lithium silicate.
3. The multicomponent material according to claim 1, wherein in the liquid material B, the auxiliary agent is one or a combination of several of a penetrating agent, a dispersing agent, a preservative and a pH adjuster.
4. The multicomponent material according to claim 1, wherein in the powder material C, the ultra-fine cement is PO42.5 or PI42.5 portland cement, and the specific surface area is 450 square meters per Kg or more.
5. The multi-component material according to claim 1, wherein in the powder material C, the fine sand has a particle size of 80-630 μm, and the fine sand is one or a combination of several of heavy calcium carbonate, quartz powder and nano calcium carbonate; the alkali metal oxide is one or the combination of two of calcium oxide and magnesium oxide.
6. The multicomponent material according to claim 1, wherein in powder material C, the auxiliary agent comprises a polycarboxylate water reducing agent, an accelerator and a strength-enhancing cellulose.
7. A construction method for repairing a concrete micro-crack of a cooling tower, characterized in that the multi-component material according to any one of claims 1 to 6 is used for repairing construction, and the construction steps are as follows:
s1, mixing the liquid materials A and B according to the volume ratio of 1:3-5, and stirring until gel is formed;
s2, adding the gel in the step S1 into an accumulator atomizer, then injecting the gel into the micro cracks to be repaired by using the accumulator atomizer, and scraping off the gel overflowed from the micro cracks by using a scraper;
s3, after the gel is injected for the first time, observing for 20-50 minutes, and if the gel in the micro cracks is reduced and partial empty appears, then using an accumulator sprayer to supplement and inject the gel for the second time;
s4, mixing the liquid material A, the liquid material B, the powder material C and the liquid material D according to the proportion of 9-12mL:9-12mL:28-35g:2.5-3.5g, and stirring until a cement paste with uniform dispersion is obtained;
s5, filling the slurry into a caulking gun, filling the slurry into the micro cracks by using the caulking gun, compacting the slurry to the depth of the micro cracks by using a leveling tool, and finally scraping the overflowed slurry at the micro cracks by using a scraping plate;
after S6, 5-9 days, spraying was performed along the fine cracks using the liquid material a.
8. The method according to claim 7, wherein in S6, the spraying is performed along the fine cracks by using the liquid material A, and the spraying amount is 140-180 mL/square meter.
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| KR20160087131A (en) * | 2015-01-13 | 2016-07-21 | 이영한 | Crack repair construction method for concrete structure |
| KR102194464B1 (en) * | 2020-04-03 | 2020-12-24 | 양정민 | Repairing method of concrete structure |
| CN112321324A (en) * | 2020-11-06 | 2021-02-05 | 北京易晟元环保工程有限公司 | Bi-component material for repairing high-strength concrete micro cracks and use method |
| CN114276114A (en) * | 2021-12-30 | 2022-04-05 | 北京易晟元环保工程有限公司 | Early-strength rapid-hardening anti-permeability crack repairing material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160087131A (en) * | 2015-01-13 | 2016-07-21 | 이영한 | Crack repair construction method for concrete structure |
| KR102194464B1 (en) * | 2020-04-03 | 2020-12-24 | 양정민 | Repairing method of concrete structure |
| CN112321324A (en) * | 2020-11-06 | 2021-02-05 | 北京易晟元环保工程有限公司 | Bi-component material for repairing high-strength concrete micro cracks and use method |
| CN114276114A (en) * | 2021-12-30 | 2022-04-05 | 北京易晟元环保工程有限公司 | Early-strength rapid-hardening anti-permeability crack repairing material |
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