CN111333403A - Preparation method and application of phosphorus-magnesium-based cement concrete coating protective material - Google Patents
Preparation method and application of phosphorus-magnesium-based cement concrete coating protective material Download PDFInfo
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/344—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the technical field of anticorrosive coating materials, in particular to a phosphorus-magnesium-based cement concrete coating protective material, a preparation method and application. The invention provides a phosphorus-magnesium-based cement concrete coating protective material which is prepared from the following raw materials in parts by weight: 55-90 parts of a magnesium compound, 25-50 parts of a salt-resistant compacting agent, 20-35 parts of a mineral admixture, 0.5-2 parts of a high-efficiency water reducing agent, 5-15 parts of a composite retarder, 10-25 parts of ground phosphate, 45-100 parts of quartz sand, 1-4 parts of fiber, 0.5-3 parts of a water-resistant agent and 2-5 parts of an alkaline pH stabilizer. The invention also provides a preparation method and application of the phosphorus-magnesium-based cement concrete coating protective material. The phosphorus-magnesium-based cement concrete coating protective material obtained by the invention has the advantages of strong chloride ion permeability resistance, good water resistance, good gas resistance, strong durability, high adhesion with a base material, good crack following performance, corrosion resistance, salt mist resistance, alkali resistance, aging resistance, low cost, environmental friendliness, simple process and the like, and has better value in practical application.
Description
Technical Field
The invention relates to the technical field of anticorrosive coating materials, in particular to a phosphorus-magnesium-based cement concrete coating protective material, a preparation method and application.
Background
In recent years, concrete has been widely used in harbor works, dams, tunnels, railways, roads, bridges, underground works, municipal constructions, and the like,
In the modern engineering construction of airports and the like, no matter industrial buildings, civil buildings and public buildings on land or engineering structures of marine environments, reinforced concrete structures are subjected to physical or chemical erosion action of various environmental conditions such as atmosphere, water and the like, so that the durability of concrete is insufficient, the structure is invalid or damaged, and economic significant loss is caused. According to research, the concrete engineering is subjected to the independent or compound action of factors such as chloride corrosion, carbonization, sulfate corrosion, freeze thawing, alkali aggregate, biological corrosion and the like for a long time, so that not only is the concrete body damaged, but also steel bars in the concrete are corroded to cause cracking and stripping of a concrete protective layer, the sectional area of the steel bars is reduced, the bearing capacity is reduced, and finally the reinforced concrete structure is damaged. In which the corrosion of reinforcing steel bars due to the corrosion of chloride salts, which ultimately leads to the destruction of concrete structures, is considered to be a major cause of the destruction of engineering concrete.
In order to prevent harmful substances such as chloride ions from invading concrete, the coating anticorrosion technology is the most effective, economic and most commonly applied anticorrosion measure in various anticorrosion measures because of the advantages of simple and convenient construction, no restriction of equipment shape, wide applicability and the like. It utilizes the functions of corrosion resistance, permeability resistance, corrosion inhibition and the like of the coating to protect the material from environmental erosion, thereby prolonging the service life of the material. At present, most of researches on concrete protective coatings focus on organic protective coatings or protective coatings formed by modifying organic materials, and the types of organic anticorrosive coatings on the market are various and can be roughly classified into the following types: epoxy coating, polyurethane coating, acrylate coating, silicone resin coating, fluororesin coating, polyurea coating. Wherein the epoxy coating has poor weather resistance and is easy to lose color and chalk under the irradiation of ultraviolet rays; the polyurethane coating is easy to turn yellow, chalk and fade, and is slow to cure; the acrylate coating is sensitive to temperature, and is easy to become brittle at low temperature and adhesive and loss strength at high temperature; the organic silicon resin coating has poor organic solvent resistance; the fluororesin coating has unstable performance, is easy to crack and peel and pollutes the environment; polyurea coatings cure too quickly, have poor interlayer adhesion, and are expensive. Patent application CN200810023815.6 discloses a reinforced concrete surface preservative, the main components are active polyoxosilane, isobutyl triethoxysilane, hexamethyl silane, active dispersing agent, and oily solvent, the preservative has high-efficiency and long-term corrosion resistance, but the cost is still higher compared with inorganic anticorrosive materials, and the preservative is not resistant to organic solvent corrosion, high temperature resistance and environmental pollution. Patent application CN201410433220.3 discloses a reinforced concrete surface preservative and a preparation method thereof, wherein the main components are silicon powder, talcum powder, quartz powder, sodium fluosilicate, magnesium fluoride, an emulsifier Aerosol A-102, xylene and the like, although the penetration depth is improved and the water absorption rate is reduced, fluoride in the components belongs to toxic substances, the corrosion resistance to human bodies and environment is insufficient.
At present, inorganic mineral modified cement-based materials are used as protective layers on concrete surfaces, and related researches at home and abroad are few. Among them, although the inorganic portland cement coating can improve the durability of a concrete structure, it has problems in that its adhesion and volume stability are poor, its strength is slowly increased, and it is easily shrunk and cracked. Patent application CN201811043706.0 discloses a geopolymer-based marine concrete protective coating material and a preparation method thereof, wherein the coating material comprises a component A and a component B, the component A comprises a composite alkali activator, and the component B mainly comprises calcined metakaolin, ordinary portland cement, water, silicone-acrylic emulsion, rice hull ash and the like. The protective coating material in the patent has the advantages of high strength and good durability, but the setting time is long, the strength is slowly increased, the construction period is delayed, and cracks are easily generated due to volume shrinkage.
Besides inorganic portland cement, magnesium phosphate cement is a gel material which forms chemical bonds based on acid-base neutralization reaction to generate strength, has partial properties of ceramics, and has the following advantages compared with common portland cement and the like commonly used in engineering: the new and old concrete has high bonding strength; the coagulation time is short; the early strength development is fast, and the strength is high; the compactness is good; the corrosion resistance, the salt spray resistance and the aging resistance are good; good fire-resistant and high-temperature resistant performance and good flexibility. Therefore, the magnesium phosphate cement has excellent basic performance suitable for preparing a concrete coating protective material. Patent application CN201810870739.6 discloses a magnesium phosphate cement protective coating for concrete fair-faced finish and a preparation method thereof, which consists of a bottom coating and a surface coating, wherein the bottom coating comprises magnesium oxide, potassium dihydrogen phosphate, borax, portland cement, fly ash and cellulose ether; the surface coating is silane emulsion. The protective coating in the patent has good cohesiveness and weather resistance, but the phosphate particles are large, the pores are large, the hydration reaction is insufficient, the setting time is prolonged, the strength is slowly increased, the stability of a hydration product is influenced by an acidic environment formed by excess phosphate and water, the water is invaded and permeated in the pores, the concrete is cracked and damaged, and the impermeability is poor. Patent application CN201910138065.5 discloses a water-based inorganic anticorrosive paint, an anticorrosive coating and application thereof, wherein the water-based inorganic anticorrosive paint consists of a component A and a component B, the component A comprises acid phosphate, graphene and water, and the component B comprises alkaline metal oxide and/or alkaline metal hydroxide and water. The magnesium phosphate cement anticorrosive coating in this patent has excellent wearability, corrosion resistance and pliability, but its hydration process produces more bubble uncontrollable, and viscosity is great, mobility is not enough also can produce more gas pocket, leads to anticorrosive coating later stage can shrink the fracture, causes the reinforcing bar corrosion.
Since the larger phosphate particles lead to insufficient hydration, the particle size can be reduced by grinding the phosphate particles to allow sufficient hydration of the magnesium phosphate cement. In view of the fact that the magnesium phosphate cement generates more bubbles in the hydration process and cannot control the shrinkage and cracking of the concrete protective coating, a concrete compacting agent needs to be introduced, the problem of air holes in the hydration process of the magnesium phosphate cement is solved, the compactness is improved, and the impermeability is improved. The compacting agent can effectively reduce air holes, prevent chloride ions, water molecules and gas from permeating, improve the impermeability of concrete, improve the strength of concrete, has the characteristics of good impermeability, alkali and acid resistance, high and low temperature resistance, no odor, no toxicity, no pollution and the like, and is widely applied in practical engineering. The current compacting agent products in China are of various types and are mainly divided into inorganic salt compacting agents and organic compacting agents. The inorganic salt compacting agent has lower cost, but can corrode the reinforcing steel bars and has poor later-stage anti-permeability effect; the organic compacting agent has an air entraining effect and has an adverse effect on the strength of concrete. In engineering applications, most compacting agents increase shrinkage, and excessive shrinkage is one of the main causes of concrete cracking. With the improvement of production requirements, the traditional compacting agent has unobvious improvement on the crack resistance, the mechanical property and the impermeability of concrete, cannot meet the expected value of the market on the compacting agent, and provides higher requirements on the performance of the compacting agent mixed in the concrete. Patent application CN201610913916.5 discloses a waterproof concrete containing FS102 waterproof compacting agent and a construction method thereof, wherein the FS102 waterproof compacting agent mainly comprises a polycarboxylic acid water reducing agent, silica sand, volcanic ash, sodium hydroxide, aminotriethanol, citric acid and an additive, the preparation method needs a plurality of procedures of stirring and dissolving after adding materials, heating and boiling, cooling, continuous stirring and the like, the preparation process is too complex, and large-area popularization and utilization are not facilitated.
In conclusion, considering the performance requirements and the cost of the concrete for the coating protective material, environmental protection, process preparation and other factors comprehensively, a need for developing a novel concrete coating protective material with excellent comprehensive performance, low cost, environmental protection, no toxicity and simple process is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the technical problem of providing a phosphorus-magnesium-based cement concrete coating protective material, a preparation method and application. The phosphorus-magnesium-based cement concrete coating protective material has the advantages of strong chloride ion permeability resistance, good water resistance, good gas resistance, strong durability, high adhesion with a base material, good crack following performance, corrosion resistance, salt mist resistance, alkali resistance, aging resistance, low cost, environmental friendliness, simple process and the like, and has good practical application value.
The invention aims to provide a phosphorus-magnesium-based cement concrete coating protective material.
The invention also aims to provide a preparation method of the magnesium phosphate-based cement concrete coating protective material.
The invention also aims to provide the application of the magnesium phosphate-based cement concrete coating protective material.
In order to achieve the purpose, the invention relates to the following technical scheme:
the invention provides a phosphorus-magnesium-based cement concrete coating protective material, which comprises the following raw materials in parts by weight: 55-90 parts of a magnesium compound, 25-50 parts of a salt-resistant compacting agent, 20-35 parts of a mineral admixture, 0.5-2 parts of a high-efficiency water reducing agent, 5-15 parts of a composite retarder, 10-25 parts of ground phosphate, 45-100 parts of quartz sand, 1-4 parts of fiber, 0.5-3 parts of a water-resistant agent and 2-5 parts of an alkaline pH stabilizer.
Preferably, the magnesium compound consists of the following components in parts by weight: 40-80 parts of dead burned magnesium and 20-60 parts of magnesium hydroxide.
Further preferably, the dead burned magnesium is in industrial grade, the fineness is 300-400 meshes, and the purity is more than 85% (by mass).
Further preferably, the magnesium hydroxide is technical grade, the fineness is 1250 meshes, and the purity is 99% (by mass).
Preferably, the salt-resistant compacting agent consists of the following components in parts by weight: 35-70 parts of superfine powder, 15-30 parts of triethanolamine, 5-15 parts of a naphthalene water reducing agent and 10-20 parts of sodium tripolyphosphate.
Preferably, the superfine powder is a combination of two or more of silica fume powder, granulated slag micropowder, gypsum powder and talcum powder.
More preferably, the particle diameters of the wollastonite powder, the fine water granulated slag powder, the gypsum powder and the talcum powder are 1-3 mu m, and the specific surface area is 500-600m2/kg。
Preferably, the mineral admixture comprises the following components in parts by weight: 40-70 parts of fly ash, 15-35 parts of silica fume and nano SiO215-25。
Further preferably, the fly ash is magnesium-based desulfurized fly ash, and the particle size is controlled to be 15-30 μm; the main component is SiO2、Al2O3And active MgO, the others being impurities.
More preferably, 85% of silica fume having a particle diameter of 0.5 to 1 μm, and SiO2The content is 96 percent, and the specific surface area is 21.55 square meters per gram.
Further preferably, nano SiO2The average particle size was 20 nm.
Preferably, the high-efficiency water reducing agent consists of the following components in parts by weight: 30-60 parts of polyether, 40-70 parts of polyacrylate and more than 20% of water reducing rate.
Preferably, the composite retarder consists of the following components in parts by weight: 45-65 parts of borax, 25-35 parts of urea and 10-20 parts of boric acid.
Preferably, the ground phosphate consists of the following components in parts by weight: 30-70 parts of ammonium dihydrogen phosphate and 30-70 parts of potassium dihydrogen phosphate.
Further preferably, the ammonium dihydrogen phosphate is industrial grade, the fineness is 400 meshes, and the purity is more than 98 percent (by mass).
Further preferably, the monopotassium phosphate is of industrial grade, the fineness is 400 meshes, and the purity is more than 98 percent (by mass).
Preferably, the mesh number of the quartz sand is 50-100 meshes.
Preferably, the fiber consists of the following components in parts by weight: 35-55 parts of glass fiber and 45-65 parts of basalt fiber.
Preferably, the water-resistant agent consists of the following components in parts by weight: 25-55 parts of polyamide-based water-proofing agent and 45-75 parts of polyurethane-based water-proofing agent.
Preferably, the alkaline pH stabilizer consists of the following components in parts by weight: 40-60 parts of aluminum oxide and 40-60 parts of calcium oxide.
The second aspect of the invention provides a preparation method of the magnesium phosphate based cement concrete coating protective material, which comprises the following steps:
(1) preparing powder: weighing a magnesium compound, a salt-resistant compacting agent, a mineral admixture, a high-efficiency water reducing agent, a composite retarder, ground phosphate, quartz sand, fiber, a water-resistant agent and an alkaline pH stabilizer according to the proportion, and uniformly stirring for later use;
(2) mixing with water: mixing the prepared powder material and water according to the proportion of 1:0.12-0.2, and stirring to obtain slurry.
The invention provides an application of the phosphorus-magnesium-based cement concrete coating protective material in the field of concrete coating protection of constructional engineering.
Specifically, the application mode is that the phosphorus-magnesium-based cement concrete coating protective material is mixed with water and stirred into slurry, and then the slurry is uniformly coated on the surface of concrete.
The material performance and the technical principle selected by the invention are as follows:
firstly, the invention uses magnesium-based desulfurized fly ash, silica fume and nano SiO2Dead-burned magnesium with holes on the surface, magnesium-based desulfurized fly ash, silica fume and nano SiO2The particle diameter of the magnesium-based desulfurized fly ash, the silica fume and the nano SiO are extremely small, and the magnesium-based desulfurized fly ash, the silica fume and the nano SiO are formed by taking the dead burned magnesium as a core through the surface adsorption effect of the dead burned magnesium2The material is formed into a stable and compact powder state by adding 1250-mesh superfine magnesium hydroxide for the special structure of the shell. The phosphate is ground to 400 meshes, the dead burned magnesium is 300-400 meshes, the specific surface area is large, the dissolution rate is high after the phosphate is mixed with water, the struvite generated by full reaction is rapidly condensed and hardened, the curing time is short, the early strength is rapidly developed, the structure is compact and stable, and the invasion of chloride ions is effectively prevented.
Secondly, the surface activity of the dead burned magnesium is high, the dead burned magnesium can be tightly combined with a hydration product or unhydrated clinker particles in common concrete through surface adsorption, and the ground phosphate can react with the unhydrated clinker of the concrete to generate the same gelatinous substance, so that the strength and the compactness of an interface are enhanced. Therefore, the interface of the concrete coating protective material and the concrete member has physical adsorption and strong chemical combination, the adhesive force is high, and the coating cannot bubble or fall off.
After being stirred, the salt-resistant compacting agent is uniformly distributed in the concrete coating protective material due to the characteristic of easy water solubility, and is subjected to chemical reaction with a cement hydration product to generate crystals and gel, so that the generation of bubbles in the hydration process can be reduced, and meanwhile, certain self-expansion is generated in the hydration period, the volume shrinkage of the concrete coating protective material is compensated, the compactness, the crack resistance, the flexibility and the impact resistance of the concrete coating protective material are improved, the cracking of the coating is inhibited, and the occurrence of cracks is reduced and prevented. Meanwhile, the particle diameters of the wollastonite powder, the grain slag micro powder, the gypsum powder and the talcum powder in the salt-resistant compacting agent are extremely small, micropores and defects among concrete coating materials can be filled and closed, gel occupies the pores of the concrete coating protective material in the growth process, the number of capillary pores and macropores is effectively reduced, and capillary channels are blocked, so that the internal porosity is reduced by more than 40%, the compactness, the overall strength and the impermeability are improved, a certain inhibiting effect on the dry shrinkage of the concrete coating protective material is achieved, and the purpose of reducing the shrinkage is achieved. In addition, the salt-resistant compacting agent only needs to be mixed according to the proportion, and the preparation process is simple and convenient.
The high-efficiency water reducing agent polyether and polyacrylate mainly improve the volume stability of the concrete coating protective material by reducing the water consumption, improve the fluidity, reduce the generation of air holes and reduce shrinkage cracking; wherein the composite retarder comprises sodium tripolyphosphate, urea and boric acid, and the coagulation time of the slurry is mainly adjusted to meet the construction requirements; the quartz sand is mainly used as a coarse aggregate, so that the long-term strength of the concrete coating protective material is improved; the glass fiber and the basalt fiber mainly improve the flexibility and the wear resistance of the concrete coating protective material; wherein the polyamide-based water-resistant agent and the polyurethane-based water-resistant agent mainly improve the water resistance of the concrete coating protective material; wherein, the alkaline pH stabilizers of aluminum oxide and calcium oxide ensure the alkaline environment mainly by adjusting the pH of the slurry, improve the hydration reaction rate and the reaction degree, and further improve the corrosion resistance.
Compared with the prior art, the invention has the beneficial effects that:
(1) the salt-resistant compacting agent has the technical effects of obviously improving the compactness, continuity and durability of the coating, reducing early shrinkage, preventing cracking, effectively preventing water molecules from permeating, blocking water seepage of concrete capillary pores, improving the anti-permeability grade standard of concrete, obviously improving the anti-permeability performance of a protective material of the coating, simultaneously improving the long-term strength of the concrete coating and reducing the corrosion of reinforcing steel bars.
(2) The magnesium-based desulfurized fly ash increases the compactness of a mortar layer by means of the micro-aggregate effect and the filling effect, and the silica fume and the nano SiO2By virtue of its pozzolanic activity, it is possible to promote the hydration process, absorb Ca (OH)2And secondary hydration reaction is generated, more hydration products are generated, the compactness and the bonding strength of the concrete coating are improved, and the weather resistance of the concrete coating is further improved.
(3) The invention makes use of a large amount of magnesium-based desulfurized fly ash, silica fume and nano SiO with excellent performance2And the industrial solid waste is comprehensively utilized for the second time, so that the waste is changed into valuable, and the method has the significance of environmental protection.
(4) The prepared concrete coating protective material has the advantages of strong chloride ion permeability resistance, good water resistance, good gas resistance, strong durability, high base material adhesion and the like by blending additives such as a salt-resistant compacting agent, a high-efficiency water reducing agent, a composite retarder and the like.
(5) The high-efficiency water reducing agent and the alkaline pH stabilizer are compounded, so that the use fault tolerance of the product slurry is improved, and the actual problem of performance reduction caused by large operation error in field construction is solved.
(6) The product has good stability and durability, does not change the basic properties after long-term storage at normal temperature and normal pressure, is not influenced by temperature and humidity changes, has long storage period, can be purchased from the market, and does not need processing treatment.
(7) The concrete coating protective material is green and environment-friendly, nontoxic and harmless, has no pollution or corrosion to building material base materials, is environment-friendly, wide in application, convenient and simple in construction, easy to generate scale benefit, and more beneficial to popularization and application.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As mentioned above, there is a need to develop a novel concrete coating protective material with excellent comprehensive performance, low cost, environmental protection, no toxicity and simple process.
In view of the above, a specific embodiment of the present invention provides a phosphorus-magnesium based cement concrete coating protective material, which is composed of the following raw materials in parts by weight: 55-90 parts of a magnesium compound, 25-50 parts of a salt-resistant compacting agent, 20-35 parts of a mineral admixture, 0.5-2 parts of a high-efficiency water reducing agent, 5-15 parts of a composite retarder, 10-25 parts of ground phosphate, 45-100 parts of quartz sand, 1-4 parts of fiber, 0.5-3 parts of a water-resistant agent and 2-5 parts of an alkaline pH stabilizer.
In another embodiment of the present invention, the magnesium compound comprises the following components in parts by weight: 40-80 parts of dead burned magnesium and 20-60 parts of magnesium hydroxide.
In still another embodiment of the present invention, the dead burned magnesium is technical grade, with a fineness of 300-400 mesh and a purity of more than 85 mass%.
In another embodiment of the present invention, the magnesium hydroxide is technical grade, with a fineness of 1250 mesh and a purity of 99% by mass.
In another embodiment of the invention, the salt-resistant compacting agent consists of the following components in parts by weight: 35-70 parts of superfine powder, 15-30 parts of triethanolamine, 5-15 parts of a naphthalene water reducing agent and 10-20 parts of sodium tripolyphosphate.
In another embodiment of the present invention, the ultrafine powder is a combination of two or more of silica fume, fine granulated slag powder, gypsum powder and talc powder.
In another embodiment of the present invention, the particle size of the wollastonite powder, the fine water granulated slag powder, the gypsum powder and the talc powder is 1-3 μm, and the specific surface area is 500-600m2/kg。
In yet another embodiment of the present invention, the mineral admixture is produced byThe composition comprises the following components in parts by weight: 40-70 parts of fly ash, 15-35 parts of silica fume and nano SiO215-25 parts.
In another embodiment of the invention, the fly ash is magnesium-based desulfurized fly ash, and the particle size is controlled to be 15-30 μm; the main component is SiO2、Al2O3And active MgO, the others being impurities.
In still another embodiment of the present invention, 85% of silica fume having a particle size of 0.5 to 1 μm and SiO2The content is 96 percent, and the specific surface area is 21.55 square meters per gram.
In yet another embodiment of the present invention, the nano SiO2The average particle size was 20 nm.
In another embodiment of the invention, the high efficiency water reducing agent comprises the following components in parts by weight: 30-60 parts of polyether, 40-70 parts of polyacrylate and more than 20% of water reducing rate.
In another embodiment of the present invention, the composite retarder comprises the following components in parts by weight: 45-65 parts of borax, 25-35 parts of urea and 10-20 parts of boric acid.
In yet another embodiment of the present invention, the ground phosphate is comprised of the following components in parts by weight: 30-70 parts of ammonium dihydrogen phosphate and 30-70 parts of potassium dihydrogen phosphate.
In still another embodiment of the present invention, the ammonium dihydrogen phosphate is technical grade, with a fineness of 400 mesh and a purity of more than 98% (by mass).
In another embodiment of the present invention, the monopotassium phosphate is technical grade, with 400 mesh fineness and greater than 98% purity (by mass).
In another embodiment of the present invention, the quartz sand has a mesh size of 50 to 100 mesh.
In another embodiment of the invention, the fiber comprises, by weight, 35-55 parts of glass fiber and 45-65 parts of basalt fiber.
In another embodiment of the invention, the water-resistant agent comprises, by weight, 25-55 parts of a polyamide-based water-resistant agent and 45-75 parts of a polyurethane-based water-resistant agent.
In another embodiment of the present invention, the alkaline pH stabilizer is composed of, by weight, 40 to 60 parts of alumina and 40 to 60 parts of calcium oxide.
In another embodiment of the present invention, a method for preparing the aforementioned phosphomagnesium-based cement concrete coating protective material is provided, which comprises the following steps:
(1) preparing powder: weighing a magnesium compound, a salt-resistant compacting agent, a mineral admixture, a high-efficiency water reducing agent, a composite retarder, ground phosphate, quartz sand, fiber, a water-resistant agent and an alkaline pH stabilizer according to the proportion, and uniformly stirring for later use;
(2) mixing with water: mixing the prepared powder material and water according to the proportion of 1:0.12-0.2, and stirring to obtain slurry.
In another embodiment of the invention, the application of the phosphorus-magnesium based cement concrete coating protective material in the field of concrete coating protection of constructional engineering is provided.
Specifically, the application mode is that the phosphorus-magnesium-based cement concrete coating protective material is mixed with water and stirred into slurry, and then the slurry is uniformly coated on the surface of concrete.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The test methods in the following examples, which are not specified under specific conditions, are generally carried out under conventional conditions.
Example 1
A preparation method of a phosphorus-magnesium based cement concrete coating protective material comprises the following steps:
(1) preparing powder: weighing 90 parts of magnesium compound (the component ratio is 80 parts of dead burned magnesium and 20 parts of magnesium hydroxide), 50 parts of salt-resistant compacting agent (the component ratio is 70 parts of superfine powder, wherein 50 parts of water granulated slag micropowder, 50 parts of gypsum powder, 15 parts of triethanolamine, 5 parts of naphthalene water reducer and 10 parts of sodium tripolyphosphate) and 35 parts of mineral admixture (the component ratio is 70 parts of magnesium-based desulfurized fly ash, 15 parts of silica fume and 15 parts of nano SiO215 parts) and 2 parts of high-efficiency water reducing agent (the component ratio is: polyether 60 parts, polypropylene40 parts of olefine acid ester), 15 parts of composite retarder (the component ratio is: 65 parts of borax, 25 parts of urea and 10 parts of boric acid), 25 parts of ground phosphate (the component ratio is: 70 parts of ammonium dihydrogen phosphate and 30 parts of potassium dihydrogen phosphate), 100 parts of quartz sand and 4 parts of fiber (the component ratio is: 55 parts of glass fiber, 45 parts of basalt fiber), 3 parts of water-resistant agent (the component ratio is: 55 parts of polyamide-based water-proofing agent, 45 parts of polyurethane-based water-proofing agent, 5 parts of alkaline pH stabilizer (the component ratio is: 60 parts of aluminum oxide and 40 parts of calcium oxide), and uniformly stirring for later use; wherein, the fineness of the dead burned magnesium is 400 meshes, and the purity is more than 85 percent; the fineness of the magnesium hydroxide is 1250 meshes, and the purity is 99 percent;
(2) mixing with water: mixing the prepared powder and water according to the proportion of 1:0.12, stirring into slurry, and uniformly brushing the slurry on the surface of concrete.
Example 2
A preparation method of a phosphorus-magnesium based cement concrete coating protective material comprises the following steps:
(1) preparing powder: weighing 75 parts of magnesium compound (the component ratio is 50 parts of dead burned magnesium and 50 parts of magnesium hydroxide), 35 parts of salt-resistant compacting agent (the component ratio is 55 parts of superfine powder, wherein 60 parts of silica fume powder, 40 parts of gypsum powder, 25 parts of triethanolamine, 10 parts of naphthalene water reducer and 10 parts of sodium tripolyphosphate) and 30 parts of mineral admixture (the component ratio is 55 parts of magnesium-based desulfurized fly ash, 25 parts of silica fume and 25 parts of nano SiO220 portions) and 1.5 portions of high-efficiency water reducing agent (the component ratio is: 50 parts of polyether, 50 parts of polyacrylate, 10 parts of composite retarder (the component ratio is: 55 parts of borax, 30 parts of urea and 15 parts of boric acid), 15 parts of ground phosphate (the component ratio is: 60 parts of ammonium dihydrogen phosphate and 40 parts of potassium dihydrogen phosphate), 85 parts of quartz sand and 2.5 parts of fiber (the component ratio is: 45 parts of glass fiber, 55 parts of basalt fiber and 1.5 parts of water-proof agent (the component ratio is: 40 parts of polyamide-based water-proofing agent, 60 parts of polyurethane-based water-proofing agent, 3.5 parts of alkaline pH stabilizer (the component ratio is: 50 parts of aluminum oxide and 50 parts of calcium oxide), and uniformly stirring for later use; wherein, the fineness of the dead burned magnesium is 350 meshes, and the purity is more than 85 percent; the fineness of the magnesium hydroxide is 1250 meshes, and the purity is 99 percent;
(2) mixing with water: mixing the prepared powder and water according to the proportion of 1:0.16, stirring into slurry, and uniformly brushing the slurry on the surface of concrete.
Example 3
A preparation method of a phosphorus-magnesium based cement concrete coating protective material comprises the following steps:
(1) preparing powder: 55 parts of magnesium compound (the component ratio is 40 parts of dead burned magnesium and 60 parts of magnesium hydroxide), 25 parts of salt-resistant compacting agent (the component ratio is 35 parts of superfine powder, wherein 40 parts of silica fume powder, 40 parts of gypsum powder, 20 parts of talcum powder, 30 parts of triethanolamine, 15 parts of naphthalene water reducer, 20 parts of sodium tripolyphosphate) and 20 parts of mineral admixture (the component ratio is 40 parts of magnesium-based desulfurized fly ash, 35 parts of silica fume and 35 parts of nano SiO225 portions of high-efficiency water reducing agent and 0.5 portion of high-efficiency water reducing agent (the component ratio is: 30 parts of polyether, 70 parts of polyacrylate, 5 parts of composite retarder (the component ratio is: 45 parts of borax, 35 parts of urea and 20 parts of boric acid), 10 parts of ground phosphate (the component ratio is: 30 parts of ammonium dihydrogen phosphate and 70 parts of potassium dihydrogen phosphate), 45 parts of quartz sand, 1 part of fiber (the component ratio is: 35 parts of glass fiber, 65 parts of basalt fiber and 0.5 part of water-proof agent (the component ratio is: 25 parts of polyamide-based water-proofing agent, 75 parts of polyurethane-based water-proofing agent, 2 parts of alkaline pH stabilizer (the component ratio is: 40 parts of aluminum oxide and 60 parts of calcium oxide) and uniformly stirring for later use; wherein, the fineness of the dead burned magnesium is 300 meshes, and the purity is more than 85 percent; the fineness of the magnesium hydroxide is 1250 meshes, and the purity is 99 percent;
(2) mixing with water: mixing the prepared powder and water according to the proportion of 1:0.2, stirring into slurry, and uniformly brushing the slurry on the surface of concrete.
Example 4
A preparation method of a phosphorus-magnesium based cement concrete coating protective material comprises the following steps:
(1) preparing powder: 55 parts of magnesium compound (the component ratio is that 80 parts of dead burned magnesium and 20 parts of magnesium hydroxide) and 50 parts of salt-resistant compacting agent (the component ratio is that 70 parts of superfine powder, wherein 50 parts of water slag micropowder, 50 parts of gypsum powder, 15 parts of triethanolamine, 5 parts of naphthalene water reducer and trimerization are weighed according to the proportion10 parts of sodium phosphate) and 35 parts of mineral admixture (the component ratio is: 70 parts of magnesium-based desulfurized fly ash, 15 parts of silica fume and nano SiO215 parts) and 2 parts of high-efficiency water reducing agent (the component ratio is: 60 parts of polyether, 40 parts of polyacrylate, 15 parts of composite retarder (the component ratio is: 65 parts of borax, 25 parts of urea and 10 parts of boric acid), 25 parts of ground phosphate (the component ratio is: 70 parts of ammonium dihydrogen phosphate and 30 parts of potassium dihydrogen phosphate), 100 parts of quartz sand and 4 parts of fiber (the component ratio is: 55 parts of glass fiber, 45 parts of basalt fiber), 3 parts of water-resistant agent (the component ratio is: 55 parts of polyamide-based water-proofing agent, 45 parts of polyurethane-based water-proofing agent, 5 parts of alkaline pH stabilizer (the component ratio is: 60 parts of aluminum oxide and 40 parts of calcium oxide), and uniformly stirring for later use; wherein, the fineness of the dead burned magnesium is 400 meshes, and the purity is more than 85 percent; the fineness of the magnesium hydroxide is 1250 meshes, and the purity is 99 percent;
(2) mixing with water: mixing the prepared powder and water according to the proportion of 1:0.12, stirring into slurry, and uniformly brushing the slurry on the surface of concrete.
Example 5
A preparation method of a phosphorus-magnesium based cement concrete coating protective material comprises the following steps:
(1) preparing powder: 55 parts of magnesium compound (the component ratio is 40 parts of dead burned magnesium and 60 parts of magnesium hydroxide), 25 parts of salt-resistant compacting agent (the component ratio is 35 parts of superfine powder, wherein 40 parts of silica fume powder, 40 parts of gypsum powder, 20 parts of talcum powder, 30 parts of triethanolamine, 15 parts of naphthalene water reducer, 20 parts of sodium tripolyphosphate) and 20 parts of mineral admixture (the component ratio is 40 parts of magnesium-based desulfurized fly ash, 35 parts of silica fume and 35 parts of nano SiO225 portions of high-efficiency water reducing agent and 0.5 portion of high-efficiency water reducing agent (the component ratio is: 30 parts of polyether, 70 parts of polyacrylate, 5 parts of composite retarder (the component ratio is: 45 parts of borax, 35 parts of urea and 20 parts of boric acid), 25 parts of ground phosphate (the component ratio is: 30 parts of ammonium dihydrogen phosphate and 70 parts of potassium dihydrogen phosphate), 45 parts of quartz sand, 1 part of fiber (the component ratio is: 35 parts of glass fiber, 65 parts of basalt fiber and 0.5 part of water-proof agent (the component ratio is: 25 portions of polyamide-based water-proofing agent, 75 portions of polyurethane-based water-proofing agent and 2 portions of alkaline pH stabilizing agent (component)The distribution ratio is as follows: 40 parts of aluminum oxide and 60 parts of calcium oxide) and uniformly stirring for later use; wherein, the fineness of the dead burned magnesium is 300 meshes, and the purity is more than 85 percent; the fineness of the magnesium hydroxide is 1250 meshes, and the purity is 99 percent;
(2) mixing with water: mixing the prepared powder and water according to the proportion of 1:0.2, stirring into slurry, and uniformly brushing the slurry on the surface of concrete.
Test example 1
The preparation method of the phosphorus-magnesium based cement concrete coating protective material is the same as the preparation method of the example 1, and is characterized in that: the concrete coating protective material does not contain a salt-resistant compacting agent in the components.
Test example 2
The preparation method of the phosphorus-magnesium based cement concrete coating protective material is the same as the preparation method of the example 1, and is characterized in that: the concrete coating protective material does not contain mineral admixture in the components.
Test example 3
The preparation method of the phosphorus-magnesium based cement concrete coating protective material is the same as the preparation method of the example 1, and is characterized in that: the concrete coating protective material does not contain an alkaline pH stabilizer in the components.
And (3) performance testing:
the performance of the concrete coating protective materials prepared in examples 1-5 and test examples 1-3 was tested, and the performance requirements of the coating system were specified in the building industry standard "protective film-forming protective coating for concrete structure" (JG/T335. one 2011), and the results are shown in the following table:
from the above table, the phosphorus-magnesium-based cement is used as the main gel material of the concrete coating protective material, the salt-resistant compacting agent and the mineral admixture are combined to be used as the auxiliary gel material, and the concrete coating protective material with strong chloride ion permeability, strong durability, corrosion resistance and aging resistance is prepared by compounding the high-efficiency water reducing agent, the composite retarder, the quartz sand, the fiber, the water-resistant agent and the alkaline pH stabilizer. The salt-resistant compacting agent can obviously improve the compactness and chloride ion permeability resistance of the concrete coating protective material; the mineral admixture can improve the bonding strength, compactness and weather resistance of the concrete coating protective material; the alkaline pH stabilizer can improve the corrosion resistance of the concrete coating protective material.
It should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples given, those skilled in the art can modify the technical solution of the present invention as needed or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention.
Claims (13)
1. The phosphorus-magnesium-based cement concrete coating protective material is characterized by comprising the following raw materials in parts by weight: 55-90 parts of a magnesium compound, 25-50 parts of a salt-resistant compacting agent, 20-35 parts of a mineral admixture, 0.5-2 parts of a high-efficiency water reducing agent, 5-15 parts of a composite retarder, 10-25 parts of ground phosphate, 45-100 parts of quartz sand, 1-4 parts of fiber, 0.5-3 parts of a water-resistant agent and 2-5 parts of an alkaline pH stabilizer.
2. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the magnesium compound is composed of the following components in parts by weight: 40-80 parts of dead burned magnesium and 20-60 parts of magnesium hydroxide; the dead burned magnesium is in industrial grade, the fineness is 300-400 meshes, and the mass purity is more than 85 percent; the magnesium hydroxide is of industrial grade, the fineness is 1250 meshes, and the mass purity is 99%.
3. The phosphorus-magnesium based cement concrete coating protective material according to claim 1, characterized in that the salt-resistant compacting agent consists of the following components in parts by weight: 35-70 parts of superfine powder, 15-30 parts of triethanolamine, 5-15 parts of a naphthalene water reducing agent and 10-20 parts of sodium tripolyphosphate; the superfine powder is the combination of two or more of silica fume powder, water granulated slag micropowder, gypsum powder and talcum powder; the particle diameters of the wollastonite powder, the grain slag micro powder, the gypsum powder and the talcum powder are 1-3 mu m, and the specific surface area is 500-600m2/kg。
4. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the mineral admixture is composed of the following components in parts by weight: 40-70 parts of fly ash, 15-35 parts of silica fume and nano SiO215-25 parts; the fly ash is magnesium-based desulfurized fly ash, the particle size is controlled to be 15-30 mu m, and the main component is SiO2、Al2O3And active MgO, the others being impurities; 85% of the silica fume with the grain diameter of 0.5-1 mu m and SiO2The content is 96 percent, and the specific surface area is 21.55 square meters per gram; the nano SiO2The average particle size was 20 nm.
5. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the high efficiency water reducing agent comprises the following components in parts by weight: 30-60 parts of polyether, 40-70 parts of polyacrylate and more than 20% of water reducing rate.
6. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the composite retarder consists of the following components in parts by weight: 45-65 parts of borax, 25-35 parts of urea and 10-20 parts of boric acid.
7. The phosphomagnesium-based cement concrete coating protective material as claimed in claim 1, characterized in that said ground phosphate is composed of the following components in parts by weight: 30-70 parts of ammonium dihydrogen phosphate and 30-70 parts of potassium dihydrogen phosphate; the ammonium dihydrogen phosphate is of industrial grade, the fineness is 400 meshes, and the mass purity is more than 98%; the monopotassium phosphate is of industrial grade, the fineness is 400 meshes, and the mass purity is more than 98%.
8. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the mesh number of the quartz sand is 50-100 meshes.
9. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the fiber is composed of the following components in parts by weight: 35-55 parts of glass fiber and 45-65 parts of basalt fiber.
10. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the water-resistant agent is composed of the following components in parts by weight: 25-55 parts of polyamide-based water-proofing agent and 45-75 parts of polyurethane-based water-proofing agent.
11. The phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the alkaline pH stabilizer is composed of the following components in parts by weight: 40-60 parts of aluminum oxide and 40-60 parts of calcium oxide.
12. The method for preparing the phosphorus-magnesium based cement concrete coating protective material according to claim 1, characterized by comprising the following steps:
① preparing powder by weighing magnesium compound, salt resistant compacting agent, mineral admixture, high efficiency water reducing agent, composite retarder, ground phosphate, quartz sand, fiber, water-proof agent, and alkaline pH stabilizer at above ratio, and stirring uniformly;
② and mixing with water, mixing the prepared powder with water at a ratio of 1:0.12-0.2, and stirring to obtain slurry.
13. The application of the phosphorus-magnesium based cement concrete coating protective material as claimed in claim 1, wherein the application mode is to mix and stir the phosphorus-magnesium based cement concrete coating protective material and water into slurry and then uniformly brush the slurry on the concrete surface.
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