CN115784704A - Acid-corrosion-resistant concrete structure repair material, preparation method and repair construction method - Google Patents
Acid-corrosion-resistant concrete structure repair material, preparation method and repair construction method Download PDFInfo
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- CN115784704A CN115784704A CN202211426389.7A CN202211426389A CN115784704A CN 115784704 A CN115784704 A CN 115784704A CN 202211426389 A CN202211426389 A CN 202211426389A CN 115784704 A CN115784704 A CN 115784704A
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- 239000000463 material Substances 0.000 title claims abstract description 180
- 239000004567 concrete Substances 0.000 title claims abstract description 144
- 238000005260 corrosion Methods 0.000 title claims abstract description 63
- 230000008439 repair process Effects 0.000 title claims abstract description 53
- 238000010276 construction Methods 0.000 title claims description 18
- 238000002360 preparation method Methods 0.000 title claims description 11
- 239000002253 acid Substances 0.000 claims abstract description 56
- 230000007797 corrosion Effects 0.000 claims abstract description 53
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 239000004094 surface-active agent Substances 0.000 claims abstract description 20
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 19
- 238000007710 freezing Methods 0.000 claims abstract description 18
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 16
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 16
- 239000004111 Potassium silicate Substances 0.000 claims abstract description 14
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 14
- 229910052913 potassium silicate Inorganic materials 0.000 claims abstract description 14
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 14
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 14
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 239000013556 antirust agent Substances 0.000 claims abstract description 10
- 229910021645 metal ion Inorganic materials 0.000 claims abstract description 10
- 239000012751 acid resistant agent Substances 0.000 claims abstract description 9
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 7
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims description 39
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 26
- 239000000243 solution Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 14
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 12
- 238000005530 etching Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000010008 shearing Methods 0.000 claims description 12
- -1 polyoxyethylene tridecyl ether Polymers 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 7
- MOMKYJPSVWEWPM-UHFFFAOYSA-N 4-(chloromethyl)-2-(4-methylphenyl)-1,3-thiazole Chemical group C1=CC(C)=CC=C1C1=NC(CCl)=CS1 MOMKYJPSVWEWPM-UHFFFAOYSA-N 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 235000019983 sodium metaphosphate Nutrition 0.000 claims description 6
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 claims description 4
- HTIQEAQVCYTUBX-UHFFFAOYSA-N amlodipine Chemical compound CCOC(=O)C1=C(COCCN)NC(C)=C(C(=O)OC)C1C1=CC=CC=C1Cl HTIQEAQVCYTUBX-UHFFFAOYSA-N 0.000 claims description 4
- 229960000528 amlodipine Drugs 0.000 claims description 4
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- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea group Chemical group NC(=S)N UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- 241000894006 Bacteria Species 0.000 claims description 2
- 241000195493 Cryptophyta Species 0.000 claims description 2
- UEZVMMHDMIWARA-UHFFFAOYSA-N Metaphosphoric acid Chemical compound OP(=O)=O UEZVMMHDMIWARA-UHFFFAOYSA-N 0.000 claims description 2
- NZWFHQBPGLLIDU-UHFFFAOYSA-N N[Ag]N Chemical group N[Ag]N NZWFHQBPGLLIDU-UHFFFAOYSA-N 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 2
- 150000001414 amino alcohols Chemical class 0.000 claims description 2
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- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 2
- 150000002462 imidazolines Chemical class 0.000 claims description 2
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- 239000002608 ionic liquid Substances 0.000 claims description 2
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- 239000003921 oil Substances 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 claims description 2
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- DHCDFWKWKRSZHF-UHFFFAOYSA-N sulfurothioic S-acid Chemical compound OS(O)(=O)=S DHCDFWKWKRSZHF-UHFFFAOYSA-N 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 150000001638 boron Chemical class 0.000 claims 1
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 229940104869 fluorosilicate Drugs 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 230000002045 lasting effect Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
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- 239000012466 permeate Substances 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 59
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 238000003763 carbonization Methods 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 230000008014 freezing Effects 0.000 description 7
- 238000010257 thawing Methods 0.000 description 6
- 239000011449 brick Substances 0.000 description 5
- 239000011456 concrete brick Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group 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 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 229910052708 sodium Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 4
- 235000019345 sodium thiosulphate Nutrition 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 239000003546 flue gas Substances 0.000 description 3
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- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 description 1
- 208000032170 Congenital Abnormalities Diseases 0.000 description 1
- 241001274961 Rubus repens Species 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- ALVYUZIFSCKIFP-UHFFFAOYSA-N triethoxy(2-methylpropyl)silane Chemical compound CCO[Si](CC(C)C)(OCC)OCC ALVYUZIFSCKIFP-UHFFFAOYSA-N 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
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Landscapes
- Aftertreatments Of Artificial And Natural Stones (AREA)
Abstract
The invention relates to an acid corrosion resistant concrete structure repair material, which comprises a material A and a material B; the material A comprises the following components in percentage by mass: 10-30 parts of sodium silicate solution, 10-30 parts of potassium silicate solution, 10-20 parts of silica sol, 0.05-0.5 part of surfactant, 0.1-1 part of reaction retarder, 0.1-0.5 part of reducing agent, 0.2-2 parts of reaction promoter, 0.05-0.5 part of anti-freezing agent, 0.1-1 part of metal ion locking agent, 0.1-0.5 part of antirust agent, 0.1-0.5 part of fluosilicate and 40-70 parts of deionized water; the material B comprises: 10-35 parts of calcium hydroxide, 5-10 parts of acid-resistant agent, 0.05-1.5 parts of surfactant, 5-35 parts of sodium hydroxide and 30-85 parts of deionized water. Compared with the prior art, the acid corrosion resistant concrete structure repair material disclosed by the invention can permeate into concrete, improves the superficial layer compactness of the concrete, enables the surface of the concrete to show the characteristics of low permeability and high compactness, has the acid corrosion resistant characteristic, and can also play a lasting protection effect even if being used in an acid environment.
Description
Technical Field
The invention relates to a concrete structure repair material, in particular to an acid corrosion resistant concrete structure repair material, a preparation method and a repair construction method.
Background
Thermal power generation is an important way for electric energy production, and heat energy generated during coal combustion is converted into electric energy through a thermal power generator set for supplyThe preparation is used. The cooling tower is an important structure of a thermal power plant, and is an important guarantee for keeping long-term safe operation of power generation. At present, most of domestic power plant cooling towers are large reinforced concrete thin-shell structures, and due to the special operating environment, the large reinforced concrete thin-shell structures are in the operating environment with alternation of dryness and humidity, cold and heat change and corrosion of acidic media for a long time, and are subjected to the combined action of a plurality of factors, so that the concrete structure is degraded to different degrees, and the durability is reduced. Particularly, the technology of 'flue gas tower integration' is adopted, the flue gas after desulfurization is discharged by adopting a cooling tower, and the flue gas contains a certain amount of SO 2 、SO 3 NO and CO 2 And when acid corrosive gases are used, the gases and water vapor are liquefied to form acid dew drops which are attached to the inner wall of the tower body, so that the concrete corrosion is more serious.
Therefore, the adoption of protection on the inner wall of the cooling tower has important significance for prolonging the service life of the cooling tower, and the surface film-forming organic anticorrosive paint is mostly adopted for the corrosion protection of the cooling tower at present. However, the protection with the conventional organic coating (surface film formation type) has the following problems: (1) by adopting the traditional organic coating, the regional repair and the integral radical cure cannot be effectively combined, and the problems of continuous deterioration in the concrete and reduction of the surface compactness of the concrete are not fundamentally solved. (2) In addition, in practical application, some congenital defects exist, such as the phenomenon that alkali is easily returned to the surface of concrete, the cohesive force between the coating and the concrete substrate is reduced, and the coating has the problems of bulging, peeling, cracking and falling off. (3) The organic coating has poor aging resistance and high temperature resistance, and the performance of the material is linearly reduced when the organic coating is in a high-temperature and high-humidity environment for a long time. (4) The deformability and water absorption of the organic coating are different from those of the concrete substrate, and the compatibility of the organic coating and the concrete substrate is poor, so that only a layer of protective film is formed on the surface of the concrete after repair, and the bonding problem occurs soon after construction. (5) When the concrete has micro cracks again, the organic coating has no function of automatically repairing the cracks, and the materials are easy to crack. (6) The organic coating construction has high requirements on the water content of the substrate, and the construction process is complex and consumes long time. Based on the problems, the traditional repair technology adopts a patch type repair method, the current situations of one-small repair in two years and one-large repair in three years occur, the repeated maintenance increases the construction difficulty, the construction period and the operation cost, and the normal operation of a power plant is influenced.
The existing Chinese patent application No. CN201910146232.0 discloses a nano modified silicate permeable crystallization material and a using method thereof, wherein the nano modified silicate permeable crystallization material comprises A, B bi-component, wherein A material comprises: 5-30 parts of sodium silicate, 5-20 parts of potassium silicate, 0.05-0.5 part of surfactant, 0.1-1 part of reaction retarder, 0.1-0.5 part of reducing agent, 0.1-2 parts of reaction promoter, 0.01-0.5 part of anti-freezing agent, 0.1-1 part of metal ion locking agent, 0.1-1 part of surface enhancer, 0.1-0.5 part of antirust agent and 40-70 parts of deionized water; wherein the B material comprises: 5-30 parts of calcium hydroxide, 0.05-1 part of surfactant, 5-30 parts of sodium hydroxide and 40-80 parts of deionized water. The inorganic water-based permeable crystalline material disclosed by the invention can permeate into concrete and be integrated with the concrete, so that the compactness of a shallow layer of the concrete is improved, the pore structure is improved, and the surface of the concrete is low in permeability and high in compactness, thereby achieving the purpose of repairing and protecting a concrete structure. The material can be used in application environments with a pH greater than 3 for a long time.
In view of the above problems, it is desirable to develop a novel acid-corrosion-resistant protective material for improving the durability of a concrete structure, which is particularly applicable to the inner wall of a cooling tower and can exhibit a long-lasting protective effect even in a strong acid environment for a long period of time.
Disclosure of Invention
Technical problem to be solved
The invention provides an acid corrosion resistant concrete structure repairing material, a preparation method and a repairing construction method, which can not only permeate into concrete to react with the concrete to generate gel or crystal, improve the superficial layer compactness of the concrete, improve the pore structure and enable the surface of the concrete to show the characteristics of low permeability and high compactness, but also have the characteristic of strong acid corrosion resistance, can also play a lasting protection effect even if being used in an acid environment for a long time and show excellent durability.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the invention provides an acid-corrosion-resistant concrete structure repair material, which comprises a material A and a material B; by mass, the amount of the solvent to be added,
the A material comprises: 10-30 parts of sodium silicate solution, 10-30 parts of potassium silicate solution, 10-20 parts of silica sol, 0.05-0.5 part of surfactant, 0.1-1 part of reaction retarder, 0.1-0.5 part of reducing agent, 0.2-2 parts of reaction promoter, 0.05-0.5 part of anti-freezing agent, 0.1-1 part of metal ion locking agent, 0.1-0.5 part of antirust agent, 0.1-0.5 part of fluosilicate and 40-70 parts of deionized water;
the material B comprises: 10-35 parts of calcium hydroxide, 5-10 parts of acid-resistant agent, 0.05-1.5 parts of surfactant, 5-35 parts of sodium hydroxide and 30-85 parts of deionized water.
Preferably, in the material A, the reaction sodium silicate solution is 25-35% by mass of sodium silicate aqueous solution, and the potassium silicate solution is 20-30% by mass of potassium silicate aqueous solution. The silicate reacts with the hydration product calcium hydroxide to form C-S-H (xCaO SiO) 2 ˙yH 2 O) gel, and can block capillary pores and micro cracks, thereby improving the compactness of the concrete.
Preferably, in the A material, siO in the silica sol 2 The content is 20-30%, and the average grain diameter is 8-20nm.
Preferably, in the material a, the reaction retarder is any one of a borate salt, sodium hydroxide, and potassium hydroxide.
Preferably, in the material A, the surfactant is any one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, dodecyl trimethyl amlodipine, imidazolines, polyoxyethylene tridecyl ether or castor oil polyoxyethylene ether ester.
Preferably, in the material A, the reducing agent is thiourea acid and thiosulfate inorganic ion reducing agent.
Preferably, in the material a, the reaction accelerator is any one of an ionic liquid of inorganic halide salts such as ammonium chloride, ammonium fluoride and sodium chloride, or citrate ions.
Preferably, in the material A, the anti-freezing agent is carbonate such as sodium carbonate and potassium carbonate.
Preferably, in the material A, the metal ion locking agent is sodium metaphosphate or metaphosphoric acid.
Preferably, in the material A, the antirust agent is a diamino silver complex or amino alcohol.
Preferably, in the material A, the fluosilicate is sodium fluosilicate or potassium fluosilicate and the like.
Preferably, in the material B, the acid-resistant agent is nano calcium carbonate.
Preferably, in the material B, the surfactant is triethanolamine.
Preferably, the nano calcium carbonate is surface-modified nano calcium carbonate,
in a second aspect, the invention provides a preparation method of an acid corrosion resistant concrete structure repair material, which comprises the following steps:
preparation of material A: weighing the components according to the formula composition of the material A, adding the components into a high-speed shearing kettle, mixing and stirring the components at the rotating speed of 1000-2000rpm for dispersion, adding a sodium silicate solution and a potassium silicate solution while stirring at a high speed, slowly dropwise adding silica sol until the silica sol is completely added, and making the mixed solution be a transparent and uniform liquid;
preparation of material B: weighing the components according to the formula composition of the material B, adding the components into a high-speed shearing kettle, mixing and stirring the components at the rotating speed of 1000-2000rpm for dispersion, and adding the calcium hydroxide solution while stirring at high speed until the calcium hydroxide solution is completely added, wherein the mixed solution is transparent and uniform liquid.
In a third aspect, the invention provides a repair construction method for a cooling tower inner wall by using an acid corrosion resistant concrete structure repair material, which comprises the following steps:
s1, chiseling: chiseling off damaged and loose parts on the inner wall of the cooling tower until no looseness, hollowing and peeling or honeycomb pitted surface exists on the tower wall;
s2, grinding: polishing the tower wall cleanly, treating a steel bar corrosion part by using a steel bar rust remover, and performing repair welding on the steel bar when the steel bar is corroded seriously and the loss of the section of the steel bar is more than or equal to 10%;
s3, cleaning: cleaning floating ash, oil stain and bacteria and algae on the surface of the tower wall;
s4, repairing: before repairing, spraying material A on the repaired part or alternatively spraying material B and material A, and then adopting modified polymer mortar and crack repairing material to carry out repairing treatment, so as to ensure that the surface of the repaired part is flush with the periphery and the thickness of the concrete covered outside the exposed reinforcing steel bar meets the design requirement;
s5, protection: the method comprises the following steps of spraying a material B and a material A on the inner wall of the cooling tower integrally and alternately, and comprises the following specific steps: firstly spraying the material B, spraying the material A after the surface is dried (30-60 min), and spraying the material B and the material A in the next round after the surface is dried; and after 24h of spraying, finishing the durable repair of the inner wall of the cooling tower.
And S2, polishing and derusting the rusted part of the steel bar, and reacting the deruster with the iron rust to form a protective film on the surface of the steel bar, so that the construction efficiency can be improved, and the working hours can be shortened. If the steel bar is corroded seriously and the section loss exceeds 10 percent, the steel bar is required to be welded.
And S4, spraying the material A or alternatively spraying the material B and the material A on the repaired part before repairing, and repairing by using the existing modified polymer mortar and crack repairing material to ensure that the surface of the repaired part is flush with the surrounding and the thickness of the concrete covered outside the exposed reinforcing steel bar meets the design requirement. The surface layer of the substrate can be strengthened by spraying the material A or alternatively spraying the material B and the material A, the effectiveness of the next construction can be guaranteed, and the interface bonding and the endurance reliability are improved.
And S5, when the cooling tower is integrally sprayed, the construction can adopt quantitative spraying by an unmanned aerial vehicle, so that the overhead operation of personnel is reduced, the material B can be directly sprayed when the concrete surface is in a wet state, the material A is sprayed after 30-60min, the material B is sprayed after 30-60min, and the material A is sprayed after 30-60 min. After 24 hours of spraying, the concrete surface can be put into use without special maintenance and protection, such as rain, water storage and the like.
In S4-S5, the amount of the sprayed material A and the sprayed material B can be 180-300mL/m 2 (ii) a Too little spraying amount, poor effect and too much spraying amount cause material waste.
After the acid corrosion resistant concrete structure repairing material is used for repairing the inner wall of the cooling tower, effective durable protection is formed on the inner wall of the cooling tower, and the acid corrosion resistant concrete structure repairing material can also play a role in protecting the inner wall of the cooling tower permanently under the action of acid corrosive gas, prevent various corrosion factors from corroding and prolong the service life of the cooling tower.
(III) advantageous effects
(1) According to the invention, the silica sol is added into the material A, so that nano-silica sol particles have good permeability and permeate into capillary pores on the surface of the base material to block the capillary pores, reduce the number of open pores, increase the number of closed pores to enhance the durability protection of the concrete base material, and form anti-corrosion protection on a concrete structure.
(2) According to the invention, the fluosilicate is added into the material A and is an acid-resistant coagulating agent, so that cement hydration products such as calcium hydroxide and the like on the surface of concrete can be enhanced, the surface strength and hardness are improved, the durability can be effectively improved, hydration heat crack is prevented, the shrinkage of the concrete is reduced, and the frost resistance of the surface of the concrete is obviously improved. Fluosilicate and silica sol are added into the material A, so that the effect of synergy can be achieved in the aspect of improving the corrosion resistance.
(3) According to the invention, the acid-resistant agent is added into the material B, so that the acid resistance of concrete can be obviously improved, and the concrete coated with the material B for protection treatment can not be corroded and damaged even if the material B is contacted with an acidic substance with PH =1-3 for a long time. The acid-resisting agent is preferably nano calcium carbonate, and a proper amount of nano calcium carbonate can enable more C-S-H gel to be formed in cement hydration products and can increase Ca (OH) 2 The content of unreacted C3S is reduced, so that the microstructure is improved, the durability is improved, the impermeability of the concrete material is improved, and the corrosion resistance of the concrete material is enhanced.
In addition, the nano calcium carbonate has a large specific surface area, so that the B material containing the nano calcium carbonate has cold resistance and heat resistance, can be directly constructed on the surface of concrete, shows a similar cold and hot shrinkage proportion to the concrete, is not easy to fall off, does not crack at low temperature, can be automatically repaired after slight deformation, and has the advantages of lasting time, good stability, convenience in construction and the like.
(4) The acid corrosion resistant concrete structure repair material is a pure inorganic material, does not contain organic matters and heavy metal ions, is simple and efficient to construct, can be constructed on wet surfaces, is not influenced by environmental temperature and humidity, and is easy to ensure the construction quality.
(5) The acid corrosion resistant concrete structure repair material shows physical and chemical properties similar to those of a concrete matrix, has the same thermal expansion coefficient and is good in compatibility. The permeability resistance, carbonization resistance, freezing and thawing resistance and other performances of the concrete can be improved, the water vapor in the concrete is not influenced to diffuse to the outside, a dynamic balance is formed between the inside and the outside of the concrete, and the health state can be maintained for a long time.
(6) The repair construction method for the inner wall of the cooling tower adopts the integrated treatment measures of local chiseling and repairing and integral protection, adopts a new generation of concrete durability protection technology, integrally improves the surface compactness, strength and impermeability of concrete, inhibits the continuous development of deterioration, and prolongs the service life of a structure.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
Example 1
The embodiment provides an acid corrosion resistant concrete structure repair material, which is prepared by the following steps:
preparing a material A: weighing 0.08 part of dodecyl trimethyl amlodipine (surfactant), 0.15 part of sodium hydroxide (reaction retarder), 0.4 part of sodium thiosulfate (reducing agent), 0.25 part of sodium chloride (reaction promoter), 0.3 part of potassium carbonate (anti-freezing agent), 0.20 part of sodium metaphosphate (metal ion locking agent), 0.20 part of sodium fluosilicate, 0.40 part of sodium aminoalcohol (antirust agent), 40 parts of deionized water and the like according to the parts by mass, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, adding 30 parts of sodium silicate solution and 20 parts of potassium silicate solution while stirring at a high speed, and slowly adding 12 parts of silica sol until the complete addition, wherein the mixed solution is transparent and uniform liquid.
Preparing a material B: weighing 0.15 part of triethanolamine (surfactant), 18 parts of sodium hydroxide, 8 parts of nano calcium carbonate (acid-resisting agent) and 50 parts of deionized water by weight, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, and adding 30 parts of calcium hydroxide solution while stirring at high speed until the calcium hydroxide solution is completely added and the mixed solution is transparent and uniform liquid.
The acid corrosion resistant concrete structure repair material prepared in example 1 is sprayed on an old concrete test block for performance test, and the spraying method comprises the following steps: firstly, a high-pressure water gun is adopted to wash the surface of the concrete test block, when the surface of the concrete is in a wet state, the material B can be sprayed for the first time, and the dosage is 150mL/m 2 After the first time of spraying the material B, spraying the material A at an interval of 40min, wherein the dosage is 150mL/m 2 . After the interval of 40min, spraying the material B for the second time, wherein the dosage is 100mL/m 2 After surface drying, the second time of material A is carried out, and the dosage is 100mL/m 2 . After 24 hours, the durability protection of the old concrete test block is finished.
The properties of the old concrete test block before spraying A, B material after treatment according to the method described above are compared as shown in table 1:
note: the test method of the acid etching quality loss rate comprises the steps of taking out the test piece from a standard curing room after the curing age of the concrete test piece is over, drying for 72 hours at 60 ℃, weighing the mass of each test piece to be accurate to 0.1g, respectively placing a reference test piece and a tested test piece coated with A, B material in a mixed solution of hydrochloric acid and sulfuric acid with the pH =2, wherein the liquid level of the mixed solution is higher than that of the test piece and is not smaller than 10mm. Each soaking time is 4h for one cycle, and the test and adjustment before each cycle are carried out to ensure that the pH value of the solution is 2 +/-0.1. After 12 cycles, the test pieces are washed by clean water, then dried for 72 hours at the temperature of 60 ℃, the mass of each test piece is weighed to be accurate to 0.1g, and the mass loss rate is calculated.
The quick freezing method is used for determining the anti-freezing performance of the concrete, which is represented by the number of quick freezing and thawing cycles of a concrete test piece under the condition of water freezing and water thawing. And after the curing age of the concrete test block is over, taking the test block out of a standard curing room, wiping surface moisture by using wet cloth, and weighing the initial mass and the initial value of the transverse fundamental frequency of the test block. The freeze-thaw cycle process should comply with the following regulations: 1) Each freeze-thaw cycle is completed within (2-4) h, and the time for thawing is not less than 1/4 of the time of the whole freeze-thaw cycle; 2) During the freezing and thawing process, the lowest temperature and the highest temperature of the center of the test piece should be controlled at (-18 +/-2) DEG C and (5 +/-2) DEG C respectively. At any moment, the central temperature of the test piece is not higher than 7 ℃ and not lower than-20 ℃; 3) The time for each test piece to be reduced from 3 ℃ to-16 ℃ is not less than 1/2 of the freezing time; the time for each test piece to rise from-16 ℃ to 3 ℃ is not less than 1/2 of the whole melting time; the temperature difference between the inside and the outside of the test piece is not more than 28 ℃; 4) The transition time between freezing and thawing should not exceed 10min. The test may be stopped when one of the following conditions occurs during the freeze-thaw cycle: 1) Reaching the specified times of freeze-thaw cycle; 2) The relative dynamic elastic modulus of the test piece is reduced to 60 percent; 3) The mass loss rate of the test piece reaches 5 percent.
As can be seen from Table 1 above, after treatment with the A, B material, the impermeability grade of the old concrete test block reaches W10 or more, which is higher than the impermeability grade before treatment. The acid etching mass loss rate is obviously reduced by 66.3 percent, the 28d carbonization depth is reduced by 60 percent, and the chloride ion mobility coefficient is reduced by 54.3 percent. These directly reflect that after the acid corrosion resistant concrete structure repairing material is used for treating old concrete test blocks, the compactness of the concrete surface at a certain depth is improved, the capabilities of resisting carbonization corrosion and resisting chloride ion penetration are enhanced, and the possibility of corrosion of external factors to reinforcing steel bars in the concrete is reduced. According to the evaluation basis of the freeze-thaw resistance specified by national and industrial standards, the mass loss rate is less than 5 percent, and the relative dynamic elastic modulus is not less than 50 percent, after the A, B material is used for treatment, the frost resistance of the old concrete test block is greatly improved, and the freeze-thaw damage resistance frequency is improved by more than 150 times.
In addition, after acid corrosion test and freeze-thaw cycle, the old concrete test block has no problems of denudation, cracking and the like, which shows that the concrete structure repair material of the invention has lasting acid corrosion resistance and durability on the concrete surface.
Example 2
The embodiment provides an acid corrosion resistant concrete structure repair material, which is prepared by the following steps:
preparing a material A: weighing 0.10 parts of dodecyl trimethyl amlodipine (surfactant), 0.20 parts of sodium hydroxide (reaction retarder), 0.4 parts of sodium thiosulfate (reducer), 0.30 parts of sodium chloride (reaction promoter), 0.35 parts of sodium carbonate (anti-freezing agent), 0.25 parts of sodium metaphosphate (metal ion locking agent), 0.40 parts of potassium fluosilicate, 0.50 parts of sodium aminoalcohol (antirust agent), 40 parts of deionized water and the like according to the parts by mass, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, adding 35 parts of sodium silicate solution and 25 parts of potassium silicate solution while stirring at high speed, and slowly dripping 15 parts of silica sol until the complete addition, wherein the mixed solution is transparent and uniform liquid.
Preparing a material B: weighing 0.15 part of triethanolamine (surfactant), 20 parts of sodium hydroxide, 10 parts of nano calcium carbonate (acid-resistant agent) and 40 parts of deionized water by mass, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, and adding 35 parts of calcium hydroxide solution while stirring at high speed until the calcium hydroxide solution is completely added and the mixed solution is transparent and uniform liquid.
The acid corrosion resistant concrete structure repair material prepared in example 2 is sprayed on an old concrete test block for performance test, and the spraying method comprises the following steps: firstly, a high-pressure water gun is adopted to wash the surface of the concrete brick, when the surface of the concrete is in a wet state, the first-time material B can be sprayed, and the dosage is 150mL/m 2 After the first time of spraying the material B, spraying the material A at an interval of 40min, wherein the dosage is 150mL/m 2 . After the interval of 40min, spraying the material B for the second time, wherein the dosage is 100mL/m 2 After surface drying, the second time of material A is carried out, and the dosage is 100mL/m 2 . After 24 hours, the durability protection of the old concrete test block is finished.
The properties of the old concrete test blocks before being sprayed with A, B material, after treatment according to the method described above, were compared as shown in table 2:
as can be seen from table 2 above, after treatment with A, B material, the old concrete test block had a barrier rating of more than W10, which is higher than the barrier rating before treatment. The acid etching mass loss rate is obviously reduced by 72.1 percent, the 28d carbonization depth is reduced by 67.3 percent, and the chloride ion mobility coefficient is reduced by 57.1 percent. These directly reflect that after the acid corrosion resistant concrete structure repairing material is used for treating old concrete test blocks, the compactness of the concrete surface at a certain depth is improved, the capabilities of resisting carbonization corrosion and resisting chloride ion penetration are enhanced, and the possibility of corrosion of external factors to reinforcing steel bars in the concrete is reduced. According to the evaluation basis of the freeze-thaw resistance specified by national and industrial standards, the mass loss rate is less than 5% and the relative dynamic elastic modulus is not less than 50%, after the A, B material is used for treatment, the frost resistance of the old concrete test brick is greatly improved, and the freeze-thaw damage resistance frequency is increased by 150 times. Meanwhile, after an acid corrosion test and freeze-thaw cycle, the old concrete test block has no problems of denudation, cracking and the like, which shows that the concrete structure repair material has lasting acid corrosion resistance and durability on the surface of concrete.
Example 3
The embodiment provides an acid corrosion resistant concrete structure repair material, which is prepared by the following steps:
preparing a material A: weighing 0.15 part of sodium dodecyl sulfate (surfactant), 0.40 part of potassium hydroxide (reaction retarder), 0.35 part of sodium thiosulfate (reducing agent), 0.40 part of sodium chloride (reaction accelerator), 0.25 part of sodium carbonate (anti-freezing agent), 0.35 part of sodium metaphosphate (metal ion locking agent), 0.35 part of sodium fluosilicate, 0.40 part of sodium aminoalcohol (antirust agent), 40 parts of deionized water and the like according to the parts by mass, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, adding 32 parts of sodium silicate solution and 26 parts of potassium silicate solution while stirring at a high speed, and slowly adding 12 parts of silica sol until the complete addition of the silica sol, wherein the mixed solution is transparent and uniform liquid.
Preparing a material B: weighing 0.2 part of triethanolamine (surfactant), 25 parts of sodium hydroxide, 9 parts of nano calcium carbonate (acid-resisting agent) and 48 parts of deionized water by weight, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, and adding 32 parts of calcium hydroxide solution while stirring at high speed until the calcium hydroxide solution is completely added and the mixed solution is transparent and uniform liquid.
The acid corrosion resistant concrete structure repair material prepared in example 3 is sprayed on an old concrete test block for performance test, and the spraying method comprises the following steps: firstly, a high-pressure water gun is adopted to wash the surface of the concrete brick, when the surface of the concrete is in a wet state, the first-pass B material can be sprayed, and the using amount is 150mL/m 2 After the first time of spraying the material B, spraying the material A at an interval of 50min, wherein the dosage is 150mL/m 2 . After the interval of 50min, spraying the material B for the second time, wherein the dosage is 100mL/m 2 After surface drying, the second time of material A is carried out, and the dosage is 100mL/m 2 . After 24 hours, the durability protection of the old concrete test block is completed.
The properties of the old concrete test block before spraying A, B material were compared after treatment according to the method described above as shown in table 3:
as can be seen from Table 3 above, the impermeability grade of the old concrete test block after treatment with the A, B material was W10 or higher, which is higher than the impermeability grade before treatment. The acid etching mass loss rate is obviously reduced by 68.4 percent, the 28d carbonization depth is reduced by 62.6 percent, and the chloride ion mobility coefficient is reduced by 55.4 percent. These directly reflect that after the acid corrosion resistant concrete structure repairing material is used for treating old concrete test blocks, the compactness of the concrete surface at a certain depth is improved, the capabilities of resisting carbonization corrosion and resisting chloride ion penetration are enhanced, and the possibility of corrosion of external factors to reinforcing steel bars in the concrete is reduced.
According to the evaluation basis of the freeze-thaw resistance specified by national and industrial standards, the mass loss rate is less than 5% and the relative dynamic elastic modulus is not less than 50%, after the A, B material is used for treatment, the frost resistance of the old concrete test brick is greatly improved, and the freeze-thaw damage resistance times are increased by 150 times. Meanwhile, after an acid corrosion test and freeze-thaw cycle, the old concrete test block has no problems of denudation, cracking and the like, which shows that the concrete structure repair material has lasting acid corrosion resistance and durability on the surface of concrete.
Example 4
The embodiment provides an acid corrosion resistant concrete structure repair material, which is prepared by the following steps:
preparing a material A: weighing 0.25 part of sodium dodecyl benzene sulfonate (surfactant), 0.50 part of potassium hydroxide (reaction retarder), 0.4 part of sodium thiosulfate (reducing agent), 0.50 part of sodium chloride (reaction accelerator), 0.30 part of sodium carbonate (anti-freezing agent), 0.40 part of sodium metaphosphate (metal ion locking agent), 0.35 part of sodium fluosilicate, 0.7 part of isobutyl triethoxysilane, 0.30 part of sodium aminoalcohol (antirust agent), 50 parts of deionized water and the like according to the parts by mass, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, adding 25 parts of sodium silicate solution and 25 parts of potassium silicate solution while stirring at high speed, and slowly dropwise adding 14 parts of silica sol until the mixture is completely added, wherein the mixture is transparent and uniform liquid.
Preparing a material B: weighing 0.25 part of triethanolamine (surfactant), 22 parts of sodium hydroxide, 8.5 parts of nano calcium carbonate (acid-resistant agent) and 45 parts of deionized water by mass, mixing, stirring and dispersing in a high-speed shearing kettle at the rotating speed of 2000rpm, adding 35 parts of calcium hydroxide solution while stirring at high speed until the calcium hydroxide solution is completely added, and obtaining a transparent and uniform mixed solution.
The acid corrosion resistant concrete structure repair material prepared in example 4 is sprayed on an old concrete test block for performance test, and the spraying method comprises the following steps: firstly, a high-pressure water gun is adopted to wash the surface of the concrete brick, and when the surface of the concrete is in a wet state, the concrete brick is washedThe first pass B material was sprayed in an amount of 150mL/m 2 After the first-time material B is sprayed, spraying the first-time material A at an interval of 45min, wherein the dosage is 150mL per square meter. After the interval of 45min, spraying the material B for the second time, wherein the dosage is 100mL/m 2 After surface drying, the second time of material A is carried out, and the dosage is 100mL/m 2 . After 24 hours, the durability protection of the old concrete test block is finished.
The properties of the old concrete test blocks before being sprayed with A, B material, after treatment according to the method described above, were compared as shown in table 4:
as can be seen from Table 4 above, after treatment with the A, B material, the old concrete test block achieved a barrier rating of more than W10, which was higher than the barrier rating before treatment. The acid etching mass loss rate is obviously reduced by 64.2 percent, the 28d carbonization depth is reduced by 63.1 percent, and the chloride ion mobility coefficient is reduced by 53.5 percent. These directly reflect that after the acid corrosion resistant concrete structure repairing material is used for treating old concrete bricks, the compactness of the concrete surface at a certain depth is improved, the capabilities of resisting carbonization corrosion and resisting chloride ion penetration are enhanced, and the possibility of corrosion of external factors to reinforcing steel bars in the concrete is reduced.
In addition, after the A, B material is used for treatment, the frost resistance of the old concrete test brick is greatly improved, and the times of freeze-thaw damage resistance are increased by 150 times. After the acid corrosion test and the freeze-thaw cycle, the old concrete test block has no problems of denudation, cracking and the like, which shows that the concrete structure repair material has lasting acid corrosion resistance and durability on the surface of concrete.
Comparative example 1
In this example, on the basis of example 1, sodium fluorosilicate in material a in the acid-corrosion-resistant concrete structure repair material was removed. The test was carried out on the old concrete test block in the same manner as in example 1 except that: the acid etching quality loss rate is reduced by 53 percent, and the freeze-thaw resistant cycle times are 175 times.
Comparative example 2
In this example, on the basis of example 1, silica sol was removed from material a in the acid corrosion resistant concrete structure repair material. The test bricks were tested in the old concrete test block according to the method of example 1, with the following results, in the same manner as in example 1: the acid etching quality loss rate is reduced by 55%, and the freeze-thaw resistant cycle times are 200.
Comparative example 3
In this example, the acid-resistant agent (nano-sized calcium carbonate) is removed from the material B in the acid-corrosion-resistant concrete structure repair material based on example 1. The test bricks were tested in the old concrete test block according to the method of example 1, with the following results, in the same manner as in example 1: the acid etching quality loss rate is reduced by 50 percent, and the freeze-thaw resistant cycle frequency is 250 times.
Compared with the prior art, the acid corrosion resistant concrete structure repair material disclosed by the invention can penetrate into concrete, improves the compactness of a concrete shallow layer, enables the concrete surface to show the characteristics of low permeability and high compactness, has a very strong acid corrosion resistance characteristic, and can also play a lasting protection effect even if being used in an acid environment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An acid corrosion resistant concrete structure repair material is characterized by comprising a material A and a material B; by mass, the amount of the solvent to be added,
the A material comprises: 10-30 parts of sodium silicate solution, 10-30 parts of potassium silicate solution, 10-20 parts of silica sol, 0.05-0.5 part of surfactant, 0.1-1 part of reaction retarder, 0.1-0.5 part of reducing agent, 0.2-2 parts of reaction promoter, 0.05-0.5 part of anti-freezing agent, 0.1-1 part of metal ion locking agent, 0.1-0.5 part of antirust agent, 0.1-0.5 part of fluosilicate and 40-70 parts of deionized water;
the material B comprises: 10-35 parts of calcium hydroxide, 5-10 parts of acid-resistant agent, 0.05-1.5 parts of surfactant, 5-35 parts of sodium hydroxide and 30-85 parts of deionized water.
2. The acid-corrosion-resistant concrete structure repair material according to claim 1, wherein in the material A, the reaction retarder is any one of boron salts, sodium hydroxide and potassium hydroxide; the surfactant is any one of sodium dodecyl sulfonate, sodium dodecyl benzene sulfonate, dodecyl trimethyl amlodipine, imidazolines, polyoxyethylene tridecyl ether or castor oil polyoxyethylene ether ester; the reducing agent is a thiourea acid or thiosulfate inorganic ion reducing agent; the reaction promoter is inorganic halide salt ionic liquid or citrate ions; the anti-freezing agent is carbonate; the metal ion locking agent is sodium metaphosphate or metaphosphoric acid; the antirust agent is a diamino silver complex or amino alcohol.
3. The acid-corrosion-resistant concrete structure repair material according to claim 1, wherein in the material A, the reaction sodium silicate solution is a 25-35% by mass sodium silicate aqueous solution, and the potassium silicate solution is a 20-30% by mass potassium silicate aqueous solution. The silicate reacts with the hydrated calcium hydroxide to form C-S-H (xCaO SiO2 & yH 2O) gel, which blocks the pores and fine cracks and improves the compactness of the concrete.
4. The acid-etching-resistant concrete structure repair material according to claim 1, wherein in the material A, siO is contained in the silica sol 2 The content is 20-30%, and the average grain diameter is 8-20nm.
5. The acid-etching-resistant concrete structure repair material according to claim 1, wherein in the material A, the fluorosilicate is sodium fluorosilicate or potassium fluorosilicate.
6. The acid-etching-resistant concrete structure repair material according to claim 1, wherein in the material B, the acid-resistant agent is nano-sized calcium carbonate.
7. The acid-etching resistant concrete structure repair material of claim 1, wherein in material B, the surfactant is triethanolamine.
8. The preparation method of the acid corrosion resistant concrete structure repair material is characterized by comprising the following steps:
preparation of material A: weighing the components according to the formula composition of the material A, adding the components into a high-speed shearing kettle, mixing and stirring the components at the rotating speed of 1000-2000rpm for dispersion, adding a sodium silicate solution and a potassium silicate solution while stirring at a high speed, slowly dropwise adding silica sol until the silica sol is completely added, and making the mixed solution be a transparent and uniform liquid;
preparation of material B: weighing the components according to the formula composition of the material B, adding the components into a high-speed shearing kettle, mixing and stirring the components at the rotating speed of 1000-2000rpm for dispersion, and adding the calcium hydroxide solution while stirring at high speed until the calcium hydroxide solution is completely added, wherein the mixed solution is transparent and uniform liquid.
9. A repair construction method for an inner wall of a cooling tower using the acid-corrosion-resistant concrete structure repair material according to any one of claims 1 to 6, comprising the steps of:
s1, chiseling: chiseling off damaged and loose parts on the inner wall of the cooling tower until no looseness, hollowing and peeling or honeycomb pitted surface exists on the tower wall;
s2, polishing: polishing the tower wall, treating the steel bar corrosion part by using a steel bar rust remover, and performing repair welding on the steel bar when the steel bar is corroded seriously and the loss of the section of the steel bar is more than or equal to 10%;
s3, cleaning: cleaning floating ash, oil stain and bacteria and algae on the surface of the tower wall;
s4, repairing: before repairing, spraying material A on the repaired part or alternatively spraying material B and material A, and then adopting modified polymer mortar and crack repairing material to carry out repairing treatment, so as to ensure that the surface of the repaired part is flush with the periphery and the thickness of the concrete covered outside the exposed reinforcing steel bar meets the design requirement;
s5, protection: the method comprises the following steps of spraying a material B and a material A on the inner wall of the cooling tower integrally and alternately, and comprises the following specific steps: firstly spraying the material B, spraying the material A after the surface is dried, and spraying the material B and the material A in the next round after the surface is dried; and after 24h of spraying, finishing the durable repair of the inner wall of the cooling tower.
10. The repair construction method according to claim 8, wherein the amount of the material A and the material B sprayed is 180 to 300mL/m 2 。
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