CN114477839B - Marine concrete corrosion inhibitor and preparation method thereof - Google Patents
Marine concrete corrosion inhibitor and preparation method thereof Download PDFInfo
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- CN114477839B CN114477839B CN202210227806.9A CN202210227806A CN114477839B CN 114477839 B CN114477839 B CN 114477839B CN 202210227806 A CN202210227806 A CN 202210227806A CN 114477839 B CN114477839 B CN 114477839B
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
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- 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 invention discloses a marine concrete corrosion inhibitor and a preparation method thereof, and belongs to the technical field of building materials. The corrosion inhibitor is prepared from the following raw materials in parts by weight: 50-100 parts of asphalt, 30-50 parts of mineral powder, 50-80 parts of modified nano silicon dioxide, 5-10 parts of vinyl resin, 5-10 parts of enhanced fiber, 1-3 parts of water reducing agent, 1-3 parts of stabilizer and 150 parts of water. The invention takes asphalt as a main material, and enhances the corrosion resistance by adding functional materials and auxiliary materials. The addition of the nano material and the fiber material can effectively improve the compactness of the matrix, delay corrosion and simultaneously enhance the strength performance of the matrix. The raw materials of the invention act together to improve the corrosion resistance of the marine concrete, and the invention has the advantages of low addition amount, simple preparation method and wide market prospect.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a marine concrete corrosion inhibitor and a preparation method thereof.
Background
The concrete has been developed into products closely related to our lives and becomes a necessary material for national infrastructure, but the continuous application and exploration of the concrete also expose the defects of concrete structures, for example, in coastal areas, saline soil, saline-alkali soil and other areas, the existence of erosion substances such as sulfate causes the damage to bridge pile foundations, bearing platforms, piers, highway subgrades, building foundations and the like to be serious. Because people neglect the damage of the corrosion to concrete structures in the areas, the phenomena of economic loss and casualties are frequent, and the research on sulfate corrosion resistant concrete is more and more in recent years.
The main causes of marine concrete damage are: corrosion of steel bars, freezing damage in cold climates, physicochemical effects of environmental erosion, and the like. The corrosion of steel bars is the main cause of concrete damage. The corrosion of the reinforcing steel bars in the concrete can be induced by two factors, namely the corrosion of chloride ions and sulfate in seawater and the corrosion of CO in the atmosphere 2 The concrete is neutralized. A great deal of engineering investigation and scientific research results at home and abroad show that the main factor causing the corrosion and the damage of the steel bars in the concrete structure under the marine environment is Cl - Enter the concrete and gather on the surface of the steel bar to promote the steel bar to generate electrochemical corrosion, thereby causing the local expansion in the concrete, the expansion and the crack of the concrete after the stress concentration and the deterioration of the durability of the concrete. The investigation of coastal wharfs around the cross-sea bridge also proves that the carbonization speed of concrete in marine environment is far lower than that of Cl - The penetration rate and the natural carbonization rate of the concrete with medium quality are 3mm/10 years on average. The research shows that: greatly improves the impermeability of concrete, reduces shrinkage cracking, reduces harmful components in the concrete, prevents Cl - The migration in the concrete pore phase is the key technology for improving the resistance of concrete to seawater and other harmful media and improving the durability of the concrete structure.
Sulfate is a highly harmful erosion medium for eroding concrete, and is dissolved in water and invades into a concrete structure through capillary pores, so that the interior of the structure is corroded, the bearing capacity of the structure is threatened, and even the structure is completely destroyed. Many countries lose structural load-bearing capacity because concrete structures are subject to sulfate corrosion and far short of their designed service life, and have to choose to demolish these structures, including buildings, bridges, tunnels, dams, and the like. The manpower and financial resources spent for demolition even far exceed the budget of newly built structures, and the economic loss and social impact caused by the sum of the two expenses are very serious.
Concrete corrosion protection can be generally physical corrosion protection and chemical corrosion protection. The commonly used powder preservative mainly contains mineral powder (or fly ash, silica powder) and calcium nitrite and other components, can inhibit the alkali-aggregate reaction of concrete and resist saline-alkali corrosion to a certain extent, but is inconvenient to use and has limited effect. The obtained concrete often has the problems of strength reduction, stability reduction and the like, and is not paid.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides the efficient marine concrete corrosion inhibitor, has low mixing amount and good effect, greatly improves the comprehensive properties of the concrete such as strength, stability and the like while effectively resisting corrosion, and is solid powder which is beneficial to transportation and use.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 50-100 parts of asphalt, 30-50 parts of mineral powder, 50-80 parts of modified nano silicon dioxide, 5-10 parts of vinyl resin, 5-10 parts of enhanced fiber, 1-3 parts of water reducing agent, 1-3 parts of stabilizer and 150 parts of water.
Further, the mineral powder is one or more of talcum powder, sepiolite powder, attapulgite, clay, kaolin or fly ash.
Further, the preparation method of the modified nano silicon dioxide comprises the following steps:
(1) drying the nano silicon dioxide powder at the temperature of 100-120 ℃ for 1-2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 30-50min, adding polyvinyl alcohol accounting for 1-3% of the mass of the mixed solution, chitosan accounting for 1-3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.1-0.5%, and performing mixed ball milling for 1-3h to obtain slurry;
(2) and (3) placing the slurry in a vacuum drying oven, and drying for 12-24h at the temperature of 80-100 ℃ to obtain the modified nano silicon dioxide.
Further, the particle size of the nano-silica powder in the step (1) is 300-500 nm.
Further, the preparation method of the reinforced fiber comprises the following steps: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 1-5% of that of the mixture, adding water to immerse the solid mixture, ball milling for 3-5h at the rotation speed of 100-.
Further, the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
Further, the stabilizing agent is sodium lauryl sulfate.
A preparation method of a marine concrete corrosion inhibitor comprises the following steps:
(1) preparing modified nano silicon dioxide: drying the nano silicon dioxide powder at the temperature of 100-120 ℃ for 1-2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 30-50min, adding polyvinyl alcohol accounting for 1-3% of the mass of the mixed solution, chitosan accounting for 1-3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.1-0.5%, and performing mixed ball milling for 1-3h to obtain slurry; placing the slurry in a vacuum drying oven, and drying at 80-100 ℃ for 12-24h to obtain modified nano silicon dioxide;
(2) preparing reinforced fibers: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide accounting for 1-5% of the mass of the mixture, adding water to immerse the solid mixture, ball milling for 3-5h at a rotation speed of 100-;
(3) uniformly dispersing asphalt, mineral powder, modified nano silicon dioxide, vinyl resin, reinforced fiber, a water reducing agent and a stabilizer in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
The raw materials used in the present invention are commercially available.
The dosage of the corrosion inhibitor is 1-3% of the mass of the gel material.
Advantageous effects
The asphalt is used as a main corrosion inhibitor, and the corrosion resistance of the asphalt is enhanced by adding functional materials and auxiliary materials. Firstly, the addition of the nano material and the fiber material can effectively improve the compactness of the matrix, and can enhance the strength performance of the matrix while delaying corrosion. The invention uses polyvinyl alcohol, chitosan and hexadecyl trimethyl ammonium bromide to mix and modify nano silicon dioxide, on one hand, the agglomeration of nano powder can be reduced, on the other hand, the nano silicon dioxide can generate volcanic ash reaction under the excitation of alkaline environment generated by cement hydration, and Ca (OH) which is easy to be eroded is consumed 2 The formation of sulfate attack products is very effectively prevented from a chemical level.
Secondly, for carbon fibers, organic matter fibers are doped, phosphorus pentoxide is mixed and modified, the strength of the modified fibers is greatly improved, meanwhile, the fiber materials are used for adsorbing nano materials, the nano materials are tightly combined, the reaction of alkaline substances in cement is promoted, calcium silicate is generated and filled in gaps of concrete together with the calcium silicate, the invasion of harmful substances such as chloride ions is effectively prevented, and the corrosion of seawater and the harmful substances contained in the seawater is prevented; the two are mutually matched, so that the comprehensive performance, particularly the strength performance and the corrosion resistance, of the concrete is greatly improved.
The raw materials of the invention act together to improve the corrosion resistance of the marine concrete, and the invention has the advantages of low addition amount, simple preparation method and wide market prospect.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.
Example 1
The marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 50 parts of asphalt, 30 parts of mineral powder, 50 parts of modified nano-silica, 5 parts of vinyl resin, 5 parts of enhanced fiber, 1 part of water reducing agent, 1 part of stabilizer and 100 parts of water.
The mineral powder is talcum powder.
The preparation method of the modified nano silicon dioxide comprises the following steps:
(1) drying nano silicon dioxide powder at 100 ℃ for 1h, taking out, adding a mixed solution of ethanol and pure water in a volume ratio of 1: 9, performing ultrasonic dispersion for 30min, adding polyvinyl alcohol accounting for 1% of the mass of the mixed solution, chitosan accounting for 1% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.1%, and performing mixed ball milling for 1h to obtain slurry;
(2) and (3) placing the slurry in a vacuum drying oven, and drying at 80 ℃ for 12-24h to obtain the modified nano silicon dioxide.
The particle size of the nano silicon dioxide powder in the step (1) is 300-500 nm.
The preparation method of the reinforced fiber comprises the following steps: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 1% of that of the mixture, adding water to immerse the solid mixture, ball milling for 3 hours at the rotation speed of 100-.
The water reducing agent is a polycarboxylic acid water reducing agent.
The stabilizer is sodium lauryl sulfate.
A preparation method of a marine concrete corrosion inhibitor comprises the following steps:
(1) preparing modified nano silicon dioxide: drying nano silicon dioxide powder at 100 ℃ for 1h, taking out, adding a mixed solution of ethanol and pure water in a volume ratio of 1: 9, performing ultrasonic dispersion for 30min, adding polyvinyl alcohol accounting for 1% of the mass of the mixed solution, chitosan accounting for 1% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.1%, and performing mixed ball milling for 1h to obtain slurry; placing the slurry in a vacuum drying oven, and drying at 80 ℃ for 12h to obtain modified nano silicon dioxide;
(2) preparing reinforced fibers: placing carbon fibers into a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 1% of that of the mixture, adding water to immerse the solid mixture, ball milling for 3 hours at the rotation speed of 100 and 200 revolutions per minute, washing the mixture to be neutral by using distilled water, and fully drying the mixture to obtain reinforced fibers;
(3) uniformly dispersing asphalt, mineral powder, modified nano silicon dioxide, vinyl resin, reinforced fiber, a water reducing agent and a stabilizer in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
Example 2
The marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 80 parts of asphalt, 40 parts of mineral powder, 60 parts of modified nano-silica, 8 parts of vinyl resin, 7 parts of enhanced fiber, 2 parts of water reducing agent, 2 parts of stabilizer and 130 parts of water.
The mineral powder is prepared by mixing sepiolite powder, attapulgite and clay according to a mass ratio of 1:1: 1.
The preparation method of the modified nano silicon dioxide comprises the following steps:
(1) drying nano silicon dioxide powder at 120 ℃ for 2h, taking out, adding a mixed solution of ethanol and pure water in a volume ratio of 1: 9, performing ultrasonic dispersion for 50min, adding polyvinyl alcohol accounting for 3% of the mixed solution in mass, chitosan accounting for 3% of the mixed solution in mass and hexadecyl trimethyl ammonium bromide accounting for 0.5% of the mixed solution in mass, and performing mixed ball milling for 3h to obtain slurry;
(2) and (3) placing the slurry in a vacuum drying oven, and drying for 24 hours at 100 ℃ to obtain the modified nano silicon dioxide.
The particle size of the nano silicon dioxide powder in the step (1) is 300-500 nm.
The preparation method of the reinforced fiber comprises the following steps: placing carbon fibers into a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 5% of that of the mixture, adding water to immerse the solid mixture, ball milling for 5 hours at the rotating speed of 200 r/min, washing the mixture to be neutral by using distilled water, and fully drying the mixture to obtain the enhanced fibers.
The water reducing agent is a naphthalene water reducing agent.
The stabilizer is sodium lauryl sulfate.
A preparation method of the marine concrete corrosion inhibitor comprises the following steps:
(1) preparing modified nano silicon dioxide: drying the nano silicon dioxide powder at 120 ℃ for 2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 50min, adding polyvinyl alcohol accounting for 3% of the mass of the mixed solution, chitosan accounting for 3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.5% of the mass of the mixed solution, and performing mixed ball milling for 3h to obtain slurry; placing the slurry in a vacuum drying oven, and drying for 24h at 100 ℃ to obtain modified nano silicon dioxide;
(2) preparing reinforced fibers: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with 5% of the mass of the mixture, adding water to immerse the solid mixture, ball milling for 5 hours at a rotation speed of 100-;
(3) uniformly dispersing asphalt, mineral powder, modified nano silicon dioxide, vinyl resin, reinforced fiber, a water reducing agent and a stabilizer in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
Example 3
The marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 100 parts of asphalt, 50 parts of mineral powder, 80 parts of modified nano silicon dioxide, 10 parts of vinyl resin, 10 parts of enhanced fiber, 3 parts of water reducing agent, 3 parts of stabilizer and 150 parts of water.
The mineral powder is fly ash.
The preparation method of the modified nano silicon dioxide comprises the following steps:
(1) drying the nano silicon dioxide powder at the temperature of 100-120 ℃ for 2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 50min, adding polyvinyl alcohol accounting for 3% of the mixed solution by mass, chitosan accounting for 3% of the mixed solution by mass and hexadecyl trimethyl ammonium bromide accounting for 0.5% of the mixed solution by mass, and performing mixed ball milling for 3h to obtain slurry;
(2) and (3) placing the slurry in a vacuum drying oven, and drying for 24h at 100 ℃ to obtain the modified nano silicon dioxide.
The particle size of the nano silicon dioxide powder in the step (1) is 300-500 nm.
The preparation method of the reinforced fiber comprises the following steps: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 5% of that of the mixture, adding water to immerse the solid mixture, ball milling for 5 hours at the rotation speed of 100-.
The water reducing agent is a polycarboxylic acid water reducing agent.
The stabilizer is sodium lauryl sulfate.
A preparation method of a marine concrete corrosion inhibitor comprises the following steps:
(1) preparing modified nano silicon dioxide: drying the nano silicon dioxide powder at 120 ℃ for 2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 50min, adding polyvinyl alcohol accounting for 3% of the mass of the mixed solution, chitosan accounting for 3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.5% of the mass of the mixed solution, and performing mixed ball milling for 3h to obtain slurry; placing the slurry in a vacuum drying oven, and drying for 24h at 100 ℃ to obtain modified nano silicon dioxide;
(2) preparing reinforced fibers: placing carbon fibers into a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 5% of that of the mixture, adding water to immerse the solid mixture, ball milling for 5 hours at the rotation speed of 100 and 200 revolutions per minute, washing the mixture to be neutral by using distilled water, and fully drying the mixture to obtain reinforced fibers;
(3) uniformly dispersing asphalt, mineral powder, modified nano silicon dioxide, vinyl resin, reinforced fiber, a water reducing agent and a stabilizer in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
Comparative example 1
The marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 100 parts of asphalt, 50 parts of mineral powder, 80 parts of nano silicon dioxide powder, 10 parts of vinyl resin, 10 parts of enhanced fiber, 3 parts of water reducing agent, 3 parts of stabilizer and 150 parts of water.
The mineral powder is fly ash.
The particle size of the nano silicon dioxide powder is 300-500 nm.
The preparation method of the reinforced fiber comprises the following steps: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 5% of that of the mixture, adding water to immerse the solid mixture, ball milling for 5 hours at the rotation speed of 100-.
The water reducing agent is a polycarboxylic acid water reducing agent.
The stabilizer is sodium lauryl sulfate.
A preparation method of a marine concrete corrosion inhibitor comprises the following steps:
(1) preparing reinforced fibers: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with 5% of the mass of the mixture, adding water to immerse the solid mixture, ball milling for 5 hours at a rotation speed of 100-;
(2) uniformly dispersing asphalt, mineral powder, nano silicon dioxide powder, vinyl resin, reinforced fiber, a water reducing agent and a stabilizer in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
The comparative example is the same as example 3 except that the nano-silica powder is directly used, that is, the nano-silica powder is not modified.
Comparative example 2
The marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 100 parts of asphalt, 50 parts of mineral powder, 80 parts of modified nano silicon dioxide, 10 parts of vinyl resin, 10 parts of carbon fiber, 3 parts of water reducing agent, 3 parts of stabilizer and 150 parts of water.
The mineral powder is fly ash.
The preparation method of the modified nano silicon dioxide comprises the following steps:
(1) drying the nano silicon dioxide powder at the temperature of 100-120 ℃ for 2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 50min, adding polyvinyl alcohol accounting for 3% of the mixed solution by mass, chitosan accounting for 3% of the mixed solution by mass and hexadecyl trimethyl ammonium bromide accounting for 0.5% of the mixed solution by mass, and performing mixed ball milling for 3h to obtain slurry;
(2) and (3) placing the slurry in a vacuum drying oven, and drying for 24h at 100 ℃ to obtain the modified nano silicon dioxide.
The particle size of the nano silicon dioxide powder in the step (1) is 300-500 nm.
The water reducing agent is a polycarboxylic acid water reducing agent.
The stabilizer is sodium lauryl sulfate.
A preparation method of a marine concrete corrosion inhibitor comprises the following steps:
(1) preparing modified nano silicon dioxide: drying the nano silicon dioxide powder at 120 ℃ for 2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 50min, adding polyvinyl alcohol accounting for 3% of the mass of the mixed solution, chitosan accounting for 3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.5% of the mass of the mixed solution, and performing mixed ball milling for 3h to obtain slurry; placing the slurry in a vacuum drying oven, and drying for 24h at 100 ℃ to obtain modified nano silicon dioxide;
(2) uniformly dispersing asphalt, mineral powder, modified nano silicon dioxide, vinyl resin, carbon fiber, a water reducing agent and a stabilizing agent in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
The comparative example is the same as example 3 except that the carbon fiber is used as it is, i.e., the carbon fiber is not subjected to reinforcing modification.
Comparative example 3
The marine concrete anticorrosive agent is prepared from the following raw materials in parts by weight: 100 parts of asphalt, 50 parts of mineral powder, 80 parts of nano silicon dioxide powder, 10 parts of vinyl resin, 10 parts of carbon fiber, 3 parts of water reducing agent, 3 parts of stabilizer and 150 parts of water.
The mineral powder is fly ash.
The particle size of the nano silicon dioxide powder is 300-500 nm.
The water reducing agent is a polycarboxylic acid water reducing agent.
The stabilizer is sodium lauryl sulfate.
A preparation method of a marine concrete corrosion inhibitor comprises the following steps:
(1) uniformly dispersing asphalt, mineral powder, nano silicon dioxide powder, vinyl resin, carbon fiber, a water reducing agent and a stabilizing agent in water according to the weight parts, uniformly stirring, performing spray drying to obtain solid powder, namely a final product, and packaging and warehousing.
The comparative example is the same as example 3 except that the nano silica powder and the carbon fiber are directly used, that is, the nano silica powder is not modified and the carbon fiber is not reinforced and modified, and the other raw materials and the preparation method are the same.
Performance testing
Practical effects of the corrosion inhibitors obtained in examples 1 to 3 of the present invention and comparative examples 1 to 3 were respectively tested. The mixing amount is 1 percent of the mass of the gel material.
The concrete trial proportion is as follows: 250kg of cement, 60kg of mineral powder, 90kg of fly ash, 600kg of sand, 1200kg of stones, 160kg of water and 10kg of water reducing agent.
Concrete Cl resistance according to ASTM1202 - Cl in Permeability electric measurement and JTJ275-2000 technical Specification for Corrosion protection of concrete structures in harbor engineering - The permeability rapid determination method determines the electric flux.
The erosion test is carried out by referring to a K method in GB/T749-2008 'cement sulfate erosion resistance test method', the prepared cement mortar test piece is placed into a sulfate erosion solution (the concentration is 95000mg/L) for erosion test after being subjected to standard maintenance for 28d, the breaking strength of the test piece is measured every 15d, the corrosion resistance coefficient is calculated, and the erosion resistance performance of the test piece is further judged. The corrosion resistance coefficient is the ratio of the breaking strength of the test piece after erosion in sulfate solution to the breaking strength of the test piece after fresh water soaking in the same age period. When the corrosion resistance coefficient is less than or equal to 0.80, the test piece is considered to be corroded and damaged.
Designing the size of a cement mortar test piece to be 10mm multiplied by 60mm, and designing SO of an erosion solution 4 2- The concentration is 95000mg/L, and the preparation method of the erosion solution comprises the following steps: dissolving powder sodium sulfate in distilled water to prepare a high-concentration sulfate erosion solution, titrating the erosion solution with dilute sulfuric acid every day in the test, and maintaining the pH value of the solution at about 7.
The test method of the properties such as strength refers to GB/T50080-2002 Standard for testing the properties of common concrete mixtures and GB/T50081-2002 Standard for testing the mechanical properties of common concrete.
The test results are shown in table 1:
TABLE 1 Performance test results
As can be seen from the data in Table 1, the concrete obtained by the embodiment of the invention has the advantages of low electric flux, poor chloride ion permeability, high 120-day breaking strength, better sulfate erosion resistance and good comprehensive performance. And the contrast ratio 1-3 of the composition preparation method is changed, the performances of the composite are obviously reduced, because the synergistic effect between the modified nano silicon dioxide and the reinforced fiber disappears, and the external appearance is the reduction of the mechanical property and the corrosion resistance.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Claims (6)
1. The marine concrete anticorrosive agent is characterized by comprising the following raw materials in parts by weight: 50-100 parts of asphalt, 30-50 parts of mineral powder, 50-80 parts of modified nano silicon dioxide, 5-10 parts of vinyl resin, 5-10 parts of enhanced fiber, 1-3 parts of water reducing agent, 1-3 parts of stabilizer and 150 parts of water;
the preparation method of the modified nano silicon dioxide comprises the following steps:
(1) drying the nano silicon dioxide powder at the temperature of 100-120 ℃ for 1-2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 30-50min, adding polyvinyl alcohol accounting for 1-3% of the mass of the mixed solution, chitosan accounting for 1-3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.1-0.5%, and performing mixed ball milling for 1-3h to obtain slurry;
(2) placing the slurry in a vacuum drying oven, and drying at 80-100 ℃ for 12-24h to obtain modified nano silicon dioxide;
the preparation method of the reinforced fiber comprises the following steps: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide with the mass of 1-5% of that of the mixture, adding water to immerse the solid mixture, ball milling for 3-5h at the rotation speed of 100-.
2. The marine concrete corrosion inhibitor according to claim 1, wherein the mineral powder is one or more of talc powder, sepiolite powder, attapulgite, clay, kaolin, or fly ash.
3. The marine concrete anticorrosive agent according to claim 1, wherein the particle size of the nano silica powder in step (1) is 300-500 nm.
4. The marine concrete corrosion inhibitor according to claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
5. The marine concrete corrosion inhibitor of claim 1, wherein the stabilizer is sodium lauryl sulfate.
6. A method for preparing the marine concrete corrosion inhibitor of any one of claims 1 to 5, comprising the steps of:
(1) preparing modified nano silicon dioxide: drying the nano silicon dioxide powder at the temperature of 100-120 ℃ for 1-2h, taking out, adding a mixed solution of ethanol and pure water with the volume ratio of 1: 9, performing ultrasonic dispersion for 30-50min, adding polyvinyl alcohol accounting for 1-3% of the mass of the mixed solution, chitosan accounting for 1-3% of the mass of the mixed solution and hexadecyl trimethyl ammonium bromide accounting for 0.1-0.5%, and performing mixed ball milling for 1-3h to obtain slurry; placing the slurry in a vacuum drying oven, and drying at 80-100 ℃ for 12-24h to obtain modified nano silicon dioxide;
(2) preparing reinforced fibers: placing carbon fibers in a ball milling tank, adding polypropylene fibers with equal mass, adding phosphorus pentoxide accounting for 1-5% of the mass of the mixture, adding water to immerse the solid mixture, ball milling for 3-5h at the rotation speed of 100-;
(3) uniformly dispersing asphalt, mineral powder, modified nano-silica, vinyl resin, reinforced fiber, a water reducing agent and a stabilizer in water according to the weight parts, uniformly stirring, spray-drying to obtain solid powder, namely a final product, and packaging and warehousing.
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| KR101999969B1 (en) * | 2019-05-15 | 2019-07-15 | 주식회사 지케이기술연구소 | Water-Impermeable Waterproof Asphalt Concrete Composition Comprising SIS And Constructing Methods Using Mixing System Device |
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| CN103881135A (en) * | 2014-03-15 | 2014-06-25 | 宿州学院 | Reinforced modified nano-silica masterbatch |
| CN104860320A (en) * | 2015-05-06 | 2015-08-26 | 杭州云界生物科技有限公司 | Method for preparing modified nanosilicon dioxide |
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