CN117024177A - Surface reinforcing agent for concrete and preparation method thereof - Google Patents
Surface reinforcing agent for concrete and preparation method thereof Download PDFInfo
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- CN117024177A CN117024177A CN202311058171.5A CN202311058171A CN117024177A CN 117024177 A CN117024177 A CN 117024177A CN 202311058171 A CN202311058171 A CN 202311058171A CN 117024177 A CN117024177 A CN 117024177A
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- silicon dioxide
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- 239000004567 concrete Substances 0.000 title claims abstract description 91
- 239000012744 reinforcing agent Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 46
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 23
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004094 surface-active agent Substances 0.000 claims abstract description 9
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 8
- 229940104869 fluorosilicate Drugs 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims description 89
- 239000006185 dispersion Substances 0.000 claims description 48
- 239000007788 liquid Substances 0.000 claims description 45
- 239000008367 deionised water Substances 0.000 claims description 32
- 229910021641 deionized water Inorganic materials 0.000 claims description 32
- BXWNKGSJHAJOGX-UHFFFAOYSA-N hexadecan-1-ol Chemical compound CCCCCCCCCCCCCCCCO BXWNKGSJHAJOGX-UHFFFAOYSA-N 0.000 claims description 32
- 239000012456 homogeneous solution Substances 0.000 claims description 29
- 239000002202 Polyethylene glycol Substances 0.000 claims description 24
- 229920001223 polyethylene glycol Polymers 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 23
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 19
- 229920000570 polyether Polymers 0.000 claims description 19
- 235000012239 silicon dioxide Nutrition 0.000 claims description 19
- 239000005543 nano-size silicon particle Substances 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 16
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 16
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 16
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 16
- 229960000541 cetyl alcohol Drugs 0.000 claims description 16
- 239000011259 mixed solution Substances 0.000 claims description 16
- -1 polyoxyethylene Polymers 0.000 claims description 16
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 16
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 14
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 claims description 14
- 239000003623 enhancer Substances 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 238000009835 boiling Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 229920002545 silicone oil Polymers 0.000 claims description 6
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 2
- UQMOLLPKNHFRAC-UHFFFAOYSA-N tetrabutyl silicate Chemical compound CCCCO[Si](OCCCC)(OCCCC)OCCCC UQMOLLPKNHFRAC-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 2
- 235000019441 ethanol Nutrition 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 claims 1
- 229940083542 sodium Drugs 0.000 claims 1
- 229940083575 sodium dodecyl sulfate Drugs 0.000 claims 1
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 239000012466 permeate Substances 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- 238000003763 carbonization Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- 239000004115 Sodium Silicate Substances 0.000 description 19
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 19
- 229910052911 sodium silicate Inorganic materials 0.000 description 19
- 239000013530 defoamer Substances 0.000 description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 13
- 239000011777 magnesium Substances 0.000 description 13
- 229910052749 magnesium Inorganic materials 0.000 description 13
- 239000000203 mixture Substances 0.000 description 13
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 13
- 230000007547 defect Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- RHNCWXBNLBPQLA-UHFFFAOYSA-L magnesium;sodium;carbonate Chemical compound [Na+].[Mg+2].[O-]C([O-])=O RHNCWXBNLBPQLA-UHFFFAOYSA-L 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5035—Silica
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/457—Non-superficial impregnation or infiltration of the substrate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/85—Coating or impregnation with inorganic materials
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application relates to a surface reinforcing agent for concrete and a preparation method thereof, belonging to the technical field of concrete building materials. The surface reinforcing agent for concrete provided by the application comprises the following raw materials in parts by weight: 10 to 30 percent of silicate, 1 to 6 percent of sodium carbonate, 1 to 5 percent of modified silicon dioxide, 0.5 to 1.5 percent of fluorosilicate, 2 to 10 percent of surfactant, 0.1 to 1 percent of multifunctional dispersing auxiliary agent, 0.1 to 0.5 percent of defoaming agent and the balance of water. The surface reinforcing agent for concrete provided by the application has a good reinforcing effect, has strong permeability and can permeate to the depth of 20-30mm of concrete; the rebound of the concrete for 5d is improved by more than 35 percent, and the rebound of the concrete for 7 days is improved by more than 30 percent; can obviously improve the carbonization resistance and sulfate erosion resistance and wear resistance of the concrete.
Description
Technical Field
The application belongs to the technical field of concrete building materials, and relates to a surface reinforcing agent for concrete and a preparation method thereof.
Background
In actual construction using concrete construction, the final concrete molding strength is greatly affected by differences in cement types, additive types, aggregate gradation, other technical proportions, and the like. This not only causes a great deal of waste of materials, but also seriously causes safety accidents, so that the formed concrete needs to be subjected to surface treatment by adopting a surface treatment agent. The surface reinforcing agent for concrete can effectively solve the problems of sand, dust, low surface hardness, microcracks and the like on the surface of the concrete caused by defects of materials, construction and the like.
The surface reinforcing agent for concrete can obviously improve the surface strength and service life of a building, and the main action principle is as follows: after the surface reinforcing agent is sprayed on the surface of the concrete, active ingredients in the reinforcing agent can permeate into the deep part of the concrete along capillary channels in the concrete by taking water as a carrier and react with unreacted substances such as calcium hydroxide and the like in the concrete to form gel or crystals, so that the capillary channels are blocked, the microscopic defects in the concrete are overcome, the concrete is more compact, and the strength of the concrete is increased. The surface reinforcing agents on the market are uneven in quality, for example, the surface reinforcing agents of some high polymer materials are difficult to form good adhesion with a concrete base, and the high polymer materials have the defects of aging and degradation, so that the reinforcing effect is gradually lost along with the time; while some inorganic surface enhancers have weak penetration and the resulting product does not provide durable strength to the concrete. Therefore, many existing surface enhancers are difficult to achieve ideal use effects.
Disclosure of Invention
The application mainly aims to provide a surface reinforcing agent for concrete, which can improve the working performance and state of the concrete and remarkably improve the strength and durability of the concrete.
The application adopts the following technical scheme to realize the purposes:
the surface reinforcing agent for the concrete comprises the following raw materials in parts by weight: 10 to 30 percent of silicate, 1 to 6 percent of sodium carbonate, 1 to 5 percent of modified silicon dioxide, 0.5 to 1.5 percent of fluorosilicate, 2 to 10 percent of surfactant, 0.1 to 1 percent of multifunctional dispersing auxiliary agent, 0.1 to 0.5 percent of defoaming agent and the balance of water.
Preferably, the surface enhancer for concrete comprises the following raw materials in parts by weight: 18 to 25 percent of silicate, 1 to 5 percent of sodium carbonate, 1.5 to 3 percent of modified silicon dioxide, 0.8 to 1.3 percent of fluorosilicate, 2 to 6 percent of surfactant, 0.2 to 0.6 percent of multifunctional dispersing auxiliary agent, 0.15 to 0.45 percent of defoaming agent and the balance of water.
Further preferably, the surfactant is one or a combination of several of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, alpha-alkenyl sodium sulfonate and anionic polyacrylamide; the multifunctional dispersing auxiliary is one or a combination of more of AMP-95, KH-550, LT-6620 and ECO-2300; the defoamer is one or a combination of a plurality of polyether defoamer, emulsified silicone oil and polyether modified silicone oil; the nano silicon dioxide is modified hydrophilic nano silicon dioxide.
Further, the application provides a preparation method of the modified silicon dioxide, which comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 5-10min at the temperature of 45-55 ℃; regulating the pH value of the mixed solution to 4-6, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 3-5 hours to disperse the solution for later use;
secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 50-60 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain the modified silicon dioxide.
Further, in the first step of the preparation method of the modified silicon dioxide, the mass ratio of deionized water to absolute ethyl alcohol is 1 (20-30); the mass ratio of the deionized water to the powder nano silicon dioxide is 1 (5-10); the mass ratio of deionized water to butyl orthosilicate is 1 (3-6).
In the second step of the preparation method of the modified silicon dioxide, the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is (3-8): 1, a step of; the mass ratio of the acrylic acid to the dispersion liquid is (1-3) 1; the mass ratio of the polyvinyl alcohol to the dispersion liquid is (3-5) 1; the mass ratio of polyoxyethylene cetyl alcohol to the dispersion liquid is (0.1-0.5) 1; the mass ratio of polyethylene glycol to the dispersion is (0.5-2): 1.
The multifunctional dispersing aids AMP-95, KH-550, LT-6620 and ECO-2300 used in the present application are all common trade names of existing commercial products, and can be purchased directly according to the trade names.
The application also provides a preparation method of the reinforcing agent for concrete, which comprises the following steps:
s1, adding modified silicon dioxide, a multifunctional dispersing aid and a surfactant into a stirrer, and stirring for 1.5-2 hours to form a homogeneous phase solution I.
S2, sequentially adding fluorosilicate and sodium carbonate into the homogeneous solution obtained in the step S1, and stirring for 0.5-1 hour to obtain a homogeneous solution II.
S3, adding silicate solution into the homogeneous solution obtained in the step S2 under the stirring state, and stirring for 1-1.5 hours until the silicate solution is uniform after the silicate solution is completely added; and adding the defoaming agent, stirring for 20-30 minutes, and filtering to obtain the concrete surface reinforcing agent.
The application has the following beneficial effects:
1. the modified silicon dioxide has a large amount of hydrophilic groups enriched on the surface, has better hydrophilicity, takes the modified silicon dioxide and silicate as main reinforcing components, can take water as a carrier, deeply permeates into the concrete, reacts with unreacted calcium hydroxide and other substances in the concrete to generate silicon-containing precipitate and gel, blocks capillary holes and improves the compactness of the concrete.
2. The application takes fluorosilicate and sodium carbonate as secondary reinforcing components, can crystallize in the concrete to form a firmer crystal structure, better block microscopic defects and pores of the concrete, and shape a more compact concrete structure.
3. The components in the application have synergistic effect, so that the sulfate erosion resistance and wear resistance of the product can be improved, and the durability of the product can be improved.
4. The surface reinforcing agent for the concrete has good reinforcing effect and strong permeability, and can permeate to the depth of 20-30mm of the concrete; the rebound of the concrete for 5d is improved by more than 35 percent, and the rebound of the concrete for 7 days is improved by more than 30 percent; can obviously improve the carbonization resistance and sulfate erosion resistance and wear resistance of the concrete.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present application is further illustrated below with reference to specific examples, which are to be construed as merely illustrative of the application and not limiting of its scope, as various equivalent modifications to the application will fall within the scope of the claims after reading the application.
Example 1 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Modified silica | Magnesium fluosilicate | Sodium dodecyl sulfonate | AMP-95 | Polyether type defoamer | Water and its preparation method |
| 22％ | 3.5％ | 2％ | 1.1％ | 5％ | 0.5％ | 0.3％ | 65.6％ |
The preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 10min at 50 ℃; regulating the pH value of the mixed solution to 5, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 4 hours to disperse the solution for later use; wherein the mass ratio of deionized water to absolute ethyl alcohol is 1:25; the mass ratio of deionized water to the powder nano silicon dioxide is 1:8; the mass ratio of deionized water to ethyl orthosilicate is 1:5.
Secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 55 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain modified silicon dioxide; wherein the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is 5:1, the mass ratio of the acrylic acid to the dispersion liquid is 2:1, the mass ratio of the polyvinyl alcohol to the dispersion liquid is 4:1, the mass ratio of the polyoxyethylene cetyl alcohol to the dispersion liquid is 0.3:1, and the mass ratio of the polyethylene glycol to the dispersion liquid is 1.5:1.
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding modified silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 2 hours to form a homogeneous phase solution I.
S2, sequentially adding magnesium fluosilicate and sodium carbonate into the homogeneous solution obtained in the step S1 according to the proportion, and stirring for 1 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1 hour until the mixture is uniform after the mixture is completely added; and adding the polyether type defoamer according to the proportion, stirring for 30 minutes, and filtering to obtain the concrete surface reinforcing agent.
Example 2 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Modified silica | Magnesium fluosilicate | Sodium dodecyl sulfate | KH-550 | Emulsified silicone oil | Water and its preparation method |
| 25％ | 1％ | 3％ | 0.8％ | 6％ | 0.2％ | 0.45％ | 63.55％ |
The preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 5min at 45 ℃; regulating the pH value of the mixed solution to 4, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 3 hours to disperse the solution for later use; wherein the mass ratio of deionized water to absolute ethyl alcohol is 1:20; the mass ratio of deionized water to the powder nano silicon dioxide is 1:10; the mass ratio of deionized water to ethyl orthosilicate is 1:3.
Secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 50 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain modified silicon dioxide; wherein the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is 8:1, the mass ratio of the acrylic acid to the dispersion liquid is 1:1, the mass ratio of the polyvinyl alcohol to the dispersion liquid is 5:1, the mass ratio of the polyoxyethylene cetyl alcohol to the dispersion liquid is 0.1:1, and the mass ratio of the polyethylene glycol to the dispersion liquid is 2:1.
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding modified silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 1.5 hours to form a homogeneous phase solution I.
S2, sequentially adding magnesium fluosilicate and sodium carbonate into the homogeneous solution obtained in the step S1 according to the proportion, and stirring for 0.5 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1.5 hours until the mixture is uniform after the sodium silicate is completely added; and adding the polyether type defoamer according to the proportion, stirring for 20 minutes, and filtering to obtain the concrete surface reinforcing agent.
Example 3 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Modified silica | Magnesium fluosilicate | Alpha-alkenylsulfonic acid sodium salt | LT-6620 | Polyether modified silicone oil | Water and its preparation method |
| 18％ | 5％ | 1.5％ | 1.3％ | 2％ | 0.6％ | 0.15％ | 71.45％ |
The preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 10min at the temperature of 55 ℃; regulating the pH value of the mixed solution to 6, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 3 hours to disperse the solution for later use; wherein the mass ratio of deionized water to absolute ethyl alcohol is 1:30; the mass ratio of deionized water to the powder nano silicon dioxide is 1:5; the mass ratio of deionized water to ethyl orthosilicate is 1:6.
Secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 60 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain modified silicon dioxide; wherein the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is 3:1, the mass ratio of the acrylic acid to the dispersion liquid is 3:1, the mass ratio of the polyvinyl alcohol to the dispersion liquid is 3:1, the mass ratio of the polyoxyethylene cetyl alcohol to the dispersion liquid is 0.5:1, and the mass ratio of the polyethylene glycol to the dispersion liquid is 0.5:1.
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding modified silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 2 hours to form a homogeneous phase solution I.
S2, sequentially adding magnesium fluosilicate and sodium carbonate into the homogeneous solution obtained in the step S1 according to the proportion, and stirring for 0.5 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1 hour until the mixture is uniform after the mixture is completely added; and adding the polyether type defoamer according to the proportion, stirring for 30 minutes, and filtering to obtain the concrete surface reinforcing agent.
Example 4 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Modified silica | Magnesium fluosilicate | Anionic polyacrylamide | ECO-2300 | Polyether type defoamer | Water and its preparation method |
| 30％ | 2.5％ | 5％ | 0.5％ | 10％ | 0.1％ | 0.5％ | 51.4％ |
The preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 8min at 50 ℃; regulating the pH value of the mixed solution to 5, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 4 hours to disperse the solution for later use; wherein the mass ratio of deionized water to absolute ethyl alcohol is 1:25; the mass ratio of deionized water to the powder nano silicon dioxide is 1:10; the mass ratio of deionized water to ethyl orthosilicate is 1:5.
Secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 50 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain modified silicon dioxide; wherein the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is 5:1, the mass ratio of the acrylic acid to the dispersion liquid is 1:1, the mass ratio of the polyvinyl alcohol to the dispersion liquid is 4:1, the mass ratio of the polyoxyethylene cetyl alcohol to the dispersion liquid is 0.5:1, and the mass ratio of the polyethylene glycol to the dispersion liquid is 1.5:1.
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding modified silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 2 hours to form a homogeneous phase solution I.
S2, sequentially adding magnesium fluosilicate and sodium carbonate into the homogeneous solution obtained in the step S1 according to the proportion, and stirring for 1 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1 hour until the mixture is uniform after the mixture is completely added; and adding the polyether type defoamer according to the proportion, stirring for 20 minutes, and filtering to obtain the concrete surface reinforcing agent.
Example 5 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Modified silica | Magnesium fluosilicate | Sodium dodecyl sulfonate | AMP-95 | Polyether type defoamer | Water and its preparation method |
| 10％ | 6％ | 1％ | 1.5％ | 4％ | 1％ | 0.1％ | 76.4％ |
The preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 10min at 50 ℃; regulating the pH value of the mixed solution to 5, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 4 hours to disperse the solution for later use; wherein the mass ratio of deionized water to absolute ethyl alcohol is 1:25; the mass ratio of deionized water to the powder nano silicon dioxide is 1:8; the mass ratio of deionized water to ethyl orthosilicate is 1:5.
Secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 55 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain modified silicon dioxide; wherein the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is 5:1, the mass ratio of the acrylic acid to the dispersion liquid is 2:1, the mass ratio of the polyvinyl alcohol to the dispersion liquid is 4:1, the mass ratio of the polyoxyethylene cetyl alcohol to the dispersion liquid is 0.3:1, and the mass ratio of the polyethylene glycol to the dispersion liquid is 1.5:1.
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding modified silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 2 hours to form a homogeneous phase solution I.
S2, sequentially adding magnesium fluosilicate and sodium carbonate into the homogeneous solution obtained in the step S1 according to the proportion, and stirring for-1 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1 hour until the mixture is uniform after the mixture is completely added; and adding the polyether type defoamer according to the proportion, stirring for 30 minutes, and filtering to obtain the concrete surface reinforcing agent.
Example 6 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Modified silica | Magnesium fluosilicate | Sodium dodecyl sulfonate | AMP-95 | Polyether type defoamer | Water and its preparation method |
| 15％ | 1.5％ | 1.5％ | 1.1％ | 2.5％ | 0.75％ | 0.2％ | 77.45％ |
The preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 5min at the temperature of 55 ℃; regulating the pH value of the mixed solution to 6, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 5 hours to disperse the solution for later use; wherein the mass ratio of deionized water to absolute ethyl alcohol is 1:30; the mass ratio of deionized water to the powder nano silicon dioxide is 1:8; the mass ratio of deionized water to ethyl orthosilicate is 1:3.
Secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 50 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain modified silicon dioxide; wherein the mass ratio of the aminopropyl triethoxysilane to the dispersion liquid is 8:1, the mass ratio of the acrylic acid to the dispersion liquid is 2:1, the mass ratio of the polyvinyl alcohol to the dispersion liquid is 4:1, the mass ratio of the polyoxyethylene cetyl alcohol to the dispersion liquid is 0.5:1, and the mass ratio of the polyethylene glycol to the dispersion liquid is 2:1.
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding modified silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 1.5 hours to form a homogeneous phase solution I.
S2, sequentially adding magnesium fluosilicate and sodium carbonate into the homogeneous solution obtained in the step S1 according to the proportion, and stirring for 0.5 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1.5 hours until the mixture is uniform after the sodium silicate is completely added; and adding the polyether type defoamer according to the proportion, stirring for 30 minutes, and filtering to obtain the concrete surface reinforcing agent. Comparative example 1 surface enhancer for concrete
Example 1 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Magnesium fluosilicate | Sodium dodecyl sulfonate | Polyether type defoamer | Water and its preparation method |
| 22％ | 3.5％ | 1.1％ | 5％ | 0.3％ | 65.6％ |
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding sodium dodecyl sulfonate, magnesium fluosilicate and sodium carbonate into a stirrer according to a proportion, and stirring for 2 hours to form a homogeneous solution.
S2, adding sodium silicate into the homogeneous solution obtained in the step S1 according to a proportion under the stirring state, and stirring for 1 hour until the mixture is uniform after the sodium silicate is completely added; and adding the polyether type defoamer according to the proportion, stirring for 30 minutes, and filtering to obtain the concrete surface reinforcing agent. Comparative example 2 preparation of reinforcing agent for concrete
The components are as follows:
| sodium silicate | Sodium carbonate | Silica dioxide | Sodium dodecyl sulfonate | AMP-95 | Polyether type defoamer | Water and its preparation method |
| 22％ | 3.5％ | 2％ | 5％ | 0.5％ | 0.3％ | 65.6％ |
The preparation method of the concrete reinforcing agent comprises the following steps:
s1, adding silicon dioxide, AMP-95 and sodium dodecyl sulfonate into a stirrer according to a proportion, and stirring for 2 hours to form a homogeneous phase solution I.
S2, adding sodium carbonate into the homogeneous solution obtained in the step S1 in sequence according to the proportion, and stirring for 1 hour to obtain a homogeneous solution II.
S3, adding sodium silicate into the homogeneous solution II obtained in the step S2 according to a proportion under the stirring state, and stirring for 1 hour until the mixture is uniform after the mixture is completely added; and adding the polyether type defoamer according to the proportion, stirring for 30 minutes, and filtering to obtain the concrete surface reinforcing agent.
Performance testing
Examples 1-6 and comparative examples 1-2 of concrete surface reinforcing agents are respectively prepared and then sprayed on the surface of C30 concrete, after the surface reinforcing agents are fully absorbed, curing is carried out, finally, a rebound value of the concrete surface is tested by a rebound tester, the corresponding strength is calculated, and meanwhile, the sulfate erosion resistance coefficient and the wear resistance are measured, and the results are shown in Table 2:
TABLE 2 before and after strength of spray-coated concrete surface reinforcing agent
From table 2 it can be concluded that: the surface reinforcing agent for concrete can effectively penetrate into the concrete to compact the concrete structure, so that the rebound value of the surface of the concrete is enhanced, and the surface strength is improved; meanwhile, the components of the surface reinforcing agent for concrete have synergistic effect, so that the strength of the concrete can be improved, and the durability of the concrete can be improved.
Claims (8)
1. The surface reinforcing agent for the concrete comprises the following raw materials in parts by weight: 10 to 30 percent of silicate, 1 to 6 percent of sodium carbonate, 1 to 5 percent of modified silicon dioxide, 0.5 to 1.5 percent of fluorosilicate, 2 to 10 percent of surfactant, 0.1 to 1 percent of multifunctional dispersing auxiliary agent, 0.1 to 0.5 percent of defoaming agent and the balance of water;
the preparation method of the modified silicon dioxide comprises the following steps:
firstly, mixing deionized water, absolute ethyl alcohol and powder nano silicon dioxide in proportion, and stirring for 5-10min at the temperature of 45-55 ℃; regulating the pH value of the mixed solution to 4-6, then dripping tetraethoxysilane into the mixed solution, and continuously stirring for 3-5 hours to disperse the solution for later use;
secondly, adding aminopropyl triethoxysilane into the dispersion liquid obtained in the first step, stirring for 30min, adding acrylic acid and polyvinyl alcohol, and stirring for 30min; adding polyoxyethylene cetyl alcohol, heating to boiling, and reacting for 2h; after the reaction is completed, cooling to 50-60 ℃, adding polyethylene glycol, stirring until the polyethylene glycol is dissolved, and drying to obtain the modified silicon dioxide.
2. The surface enhancer for concrete according to claim 1, wherein in the first step of the preparation method of the modified silica, the mass ratio of deionized water to absolute ethyl alcohol is 1 (20-30); the mass ratio of the deionized water to the powder nano silicon dioxide is 1 (5-10); the mass ratio of deionized water to butyl orthosilicate is 1 (3-6).
3. The surface enhancer for concrete according to claim 1, wherein in the second step of the method for producing modified silica, the mass ratio of aminopropyl triethoxysilane to the dispersion is (3-8) 1; the mass ratio of the acrylic acid to the dispersion liquid is (1-3) 1; the mass ratio of the polyvinyl alcohol to the dispersion liquid is (3-5) 1; the mass ratio of polyoxyethylene cetyl alcohol to the dispersion liquid is (0.1-0.5) 1; the mass ratio of polyethylene glycol to the dispersion is (0.5-2): 1.
4. A surface enhancer for concrete according to any one of claims 1 to 3, comprising the following raw materials in weight ratio: 18 to 25 percent of silicate, 1 to 5 percent of sodium carbonate, 1.5 to 3 percent of modified silicon dioxide, 0.8 to 1.3 percent of fluorosilicate, 2 to 6 percent of surfactant, 0.2 to 0.6 percent of multifunctional dispersing auxiliary agent, 0.15 to 0.45 percent of defoaming agent and the balance of water.
5. The surface-enhancing agent for concrete according to claim 4, wherein the surfactant is one or a combination of several of sodium dodecylbenzene sulfonate, sodium dodecylsulfate, sodium alpha-alkenyl sulfonate and anionic polyacrylamide.
6. The surface-enhancing agent for concrete according to claim 4, wherein the multifunctional dispersing aid is one or a combination of several of AMP-95, KH-550, LT-6620 and ECO-2300.
7. The surface enhancer for concrete according to claim 4, wherein the antifoaming agent is one or a combination of several of alcohol polyether, emulsified silicone oil and polyether modified silicone oil.
8. A surface enhancer for concrete according to any one of claims 1 to 3, wherein the preparation method of the surface enhancer for concrete comprises the steps of:
s1, adding modified silicon dioxide, a multifunctional dispersing aid and a surfactant into a stirrer, and stirring for 1.5-2 hours to form a homogeneous phase solution I.
S2, sequentially adding fluorosilicate and sodium carbonate into the homogeneous solution obtained in the step S1, and stirring for 0.5-1 hour to obtain a homogeneous solution II.
S3, adding silicate solution into the homogeneous solution II obtained in the step S2 under the stirring state, and stirring for 1-1.5 hours until the silicate solution is uniform after the silicate solution is completely added; and adding the defoaming agent, stirring for 20-30 minutes, and filtering to obtain the concrete surface reinforcing agent.
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