CN112624711A - Anti-freezing concrete for building and preparation method thereof - Google Patents
Anti-freezing concrete for building and preparation method thereof Download PDFInfo
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- CN112624711A CN112624711A CN202110071701.4A CN202110071701A CN112624711A CN 112624711 A CN112624711 A CN 112624711A CN 202110071701 A CN202110071701 A CN 202110071701A CN 112624711 A CN112624711 A CN 112624711A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
- C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
-
- 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
- C04B2111/00008—Obtaining or using nanotechnology related 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete preparation, in particular to antifreezing concrete for buildings and a preparation method thereof; the composite material is prepared from the following raw materials in parts by weight: 600-700 parts of portland cement, 450-550 parts of river sand, 90-120 parts of fly ash, 65-80 parts of gangue powder, 55-70 parts of modified AR glass fiber, 48-63 parts of modified pyrophyllite fine powder, 35-45 parts of silica aerogel nano powder, 25-36 parts of polyvinyl alcohol fiber, 36-55 parts of hydrated lime, 16-24 parts of sodium bicarbonate, 15-20 parts of rosin thermopolymer air entraining agent, 20-30 parts of antifreezing agent, 18-25 parts of water reducing agent, 25-34 parts of reinforcing fiber, 600-700 parts of early strength agent and 560-680 parts of water; the concrete prepared by the invention not only has excellent frost resistance and compressive strength, but also has good splitting tensile strength; can be suitable for the construction of concrete at low temperature and negative temperature.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to antifreezing concrete for buildings and a preparation method thereof.
Background
The concrete is artificial stone which is prepared by taking cement as a main cementing material, adding water, sand, stones and chemical additives and mineral admixtures if necessary, mixing the materials according to a proper proportion, uniformly stirring, densely molding, curing and hardening. Concrete is mainly divided into two stages and states: plastic state before setting and hardening, namely fresh concrete or concrete mixture; hardened, i.e. hardened concrete or concrete. The concrete strength grade is divided into a cubic compressive strength standard value, and the Chinese common concrete strength grade is divided into 14 grades: c15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75 and C80.
In northern areas of China, the weather is cold due to long winter time. Therefore, the concrete anti-freezing performance of the concrete has strict requirements to adapt to the construction of the concrete at low temperature and negative temperature.
Based on the technical problems proposed above, it is an urgent need to solve the technical problems of the technical personnel in the field to provide a frost resistant concrete for buildings and a preparation method thereof.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the antifreezing concrete for the building and the preparation method thereof, and the antifreezing concrete has the advantages that: the prepared concrete not only has excellent frost resistance and compressive strength, but also has good splitting tensile strength; can be suitable for the construction of concrete at low temperature and negative temperature.
In order to achieve the purpose, the invention provides the following technical scheme:
the antifreezing concrete for the building comprises the following raw materials in parts by weight: 600-700 parts of portland cement, 450-550 parts of river sand, 90-120 parts of fly ash, 65-80 parts of gangue powder, 55-70 parts of modified AR glass fiber, 48-63 parts of modified pyrophyllite fine powder, 35-45 parts of silica aerogel nano powder, 25-36 parts of polyvinyl alcohol fiber, 36-55 parts of hydrated lime, 16-24 parts of sodium bicarbonate, 15-20 parts of rosin thermopolymer air entraining agent, 20-30 parts of antifreezing agent, 18-25 parts of water reducing agent, 25-34 parts of reinforcing fiber, 600-700 parts of early strength agent and 560-680 parts of water.
Further, the preparation method of the modified AR glass fiber comprises the following steps:
a. adding a silane coupling agent into an ethanol solution with the concentration of 70-85% according to the standard of 30-50 g/L, carrying out ultrasonic mixing for 8-10 min, then placing AR glass fibers with the mass being 15-20 times that of the silane coupling agent into a mixed component obtained after the ultrasonic mixing, then adding potassium persulfate with the mass being 3-5% of the AR glass fibers and dibutyltin dilaurate with the mass being 2.0-3.5% into the mixed component, and carrying out ultrasonic stirring for 10-15 min;
b. b, transferring the mixture obtained in the step a into a reaction kettle, carrying out heat preservation reaction for 6-8 hours at 50-60 ℃, taking out the AR glass fiber after the reaction is finished, and washing away the silane coupling agent remained on the surface of the AR glass fiber by using absolute ethyl alcohol; then placing the alcohol-washed AR glass fiber in a constant-temperature drying oven, and drying the AR glass fiber at the temperature of 50-60 ℃; and obtaining a finished product of the modified AR glass fiber.
Furthermore, the air-entraining agent is any one of rosin thermopolymer air-entraining agent and alkyl benzene sulfonate air-entraining agent.
Furthermore, the preparation method of the modified pyrophyllite fine powder comprises the following steps:
grinding pyrophyllite into fine powder with the particle size of 100-200 meshes, soaking the fine powder in hydrochloric acid solution with the concentration of 1.0-1.5 mol/L, then performing ultrasonic dispersion on the fine powder for 10-15 min, filtering the pyrophyllite fine powder, and cleaning the pyrophyllite fine powder to be neutral by using distilled water; after cleaning, soaking the pyrophyllite powder in a modification solution at the temperature of 65-80 ℃, standing at constant temperature for 3-5 h, filtering out the pyrophyllite powder, and drying to obtain modified pyrophyllite powder; wherein the modified liquid is prepared by mixing and stirring triisostearoyl isopropyl titanate, vinyl triethoxysilane and distilled water according to the mass ratio of 2.3-3.5: 4.2-4.8: 100-120.
Furthermore, the antifreeze is any one of propylene glycol butyl ether and ethylene glycol butyl ether acetate.
Furthermore, the water reducing agent is any one of a naphthalene water reducing agent and a polycarboxylic acid water reducing agent.
Furthermore, the fiber reinforcement body is made of any one of zirconia fiber and basalt fiber.
Furthermore, the early strength agent is selected from any one of calcium formate and urea.
A preparation method of frost-resistant concrete for buildings comprises the following steps:
s1, accurately weighing the raw materials according to the specified weight parts, processing the raw materials into raw materials meeting the production requirements, and storing the raw materials for later use;
s2, transferring portland cement, river sand, fly ash, gangue powder, modified AR glass fiber, modified pyrophyllite fine powder and a water reducing agent into concrete mixing equipment, mixing and stirring the materials in the mixing equipment at a speed of 100-180 r/min for 5-10 min to obtain a first mixture;
s3, adding the silicon dioxide aerogel nano powder, the polyvinyl alcohol fibers and the reinforcing fibers into another concrete mixing device, mixing and stirring the materials in the mixing device at a speed of 120-200 r/min for 5-10 min, and then marking as a second mixture;
s4, transferring the first mixture and the second mixture into a concrete mixer, adding the rest raw materials into the concrete mixer, and mixing and stirring at the speed of 300-500 r/min for 20-30 min to obtain the finished frost-resistant concrete for buildings.
In summary, the invention has the following advantages:
1. according to the invention, the silane coupling agent, the potassium persulfate and the dibutyltin dilaurate are matched with each other, so that the chemical modification of the AR glass fiber is realized. Under the action of potassium persulfate and dibutyltin dilaurate, the silane coupling agent can perform chemical reaction with related groups on the surface of the AR glass fiber and is connected through a chemical bond with strong acting force, so that the silane coupling agent is successfully grafted to the AR glass fiber, the dispersion performance of the AR glass fiber is effectively improved, the modified AR glass fiber can be well combined with a cement matrix interface in the process of preparing concrete, the initial crack quantity of the concrete can be remarkably reduced by using the modified AR glass fiber, the length and the width of a crack are effectively inhibited, the possibility of crack generation is greatly reduced, and the frost resistance is enhanced.
2. According to the invention, the pyrophyllite is soaked in the hydrochloric acid solution, the natural covering formed on the surface of the pyrophyllite can be removed to the greatest extent under the action of the hydrochloric acid solution and ultrasonic dispersion, and then the pyrophyllite can be chemically crosslinked with vinyl triethoxysilane under the action of isopropyl triisostearoyl titanate in the modification solution, so that the surface modification of the pyrophyllite is realized, and the dispersion performance of the pyrophyllite in a cement matrix interface is improved. In addition, due to the matched use of the limestone and the sodium bicarbonate, after the hydrated lime is dissolved in water, a large amount of heat is released, the temperature of the interface of the cement matrix is increased, so that the sodium bicarbonate is decomposed to generate carbon dioxide gas, and under the action of the carbon dioxide gas, the fly ash, the gangue powder, the modified AR glass fiber, the modified pyrophyllite fine powder, the silica aerogel nano powder, the polyvinyl alcohol fiber and the reinforcing fiber can be uniformly dispersed into gaps formed in the cement matrix, so that the frost resistance and the compressive strength of the concrete are effectively improved.
Detailed Description
In order to further clarify the objects, technical solutions and advantages of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
1. the antifreezing concrete for the building comprises the following raw materials in parts by weight: 600 parts of portland cement, 450 parts of river sand, 90 parts of fly ash, 65 parts of coal gangue powder, 55 parts of modified AR glass fiber, 48 parts of modified pyrophyllite fine powder, 35 parts of silica aerogel nano powder, 25 parts of polyvinyl alcohol fiber, 36 parts of slaked lime, 16 parts of sodium bicarbonate, 15 parts of rosin thermopolymer air entraining agent, 20 parts of antifreezing agent, 18 parts of water reducing agent, 25 parts of reinforcing fiber, 600 parts of early strength agent and 560 parts of water.
The preparation method of the modified AR glass fiber comprises the following steps:
a. adding a silane coupling agent into an ethanol solution with the concentration of 70% according to the standard of 30g/L, carrying out ultrasonic mixing for 8min, then placing AR glass fiber with the mass 15 times that of the silane coupling agent into a mixed component obtained after ultrasonic mixing, then adding potassium persulfate with the mass of 3% of the AR glass fiber and dibutyltin dilaurate with the mass of 2.0% into the mixed component, and carrying out ultrasonic stirring for 10 min;
b. b, transferring the mixture obtained in the step a into a reaction kettle, carrying out heat preservation reaction for 6 hours at the temperature of 50 ℃, taking out the AR glass fiber after the reaction is finished, and washing away the silane coupling agent remained on the surface of the AR glass fiber by using absolute ethyl alcohol; then placing the alcohol-washed AR glass fiber in a constant-temperature drying oven, and drying the AR glass fiber at the temperature of 50 ℃; and obtaining a finished product of the modified AR glass fiber.
The air entraining agent is rosin thermopolymer air entraining agent.
The preparation method of the modified pyrophyllite fine powder comprises the following steps:
grinding pyrophyllite into fine powder with the particle size of 100 meshes, soaking the fine powder in hydrochloric acid solution with the concentration of 1.0mol/L, then performing ultrasonic dispersion on the fine powder for 10min, filtering the pyrophyllite fine powder, and cleaning the pyrophyllite fine powder to be neutral by using distilled water; after cleaning, soaking the pyrophyllite powder in a modification solution at the temperature of 65 ℃, standing for 3 hours at constant temperature, filtering out the pyrophyllite powder, and drying to obtain modified pyrophyllite powder;
wherein the modified liquid is prepared by mixing and stirring triisostearoyl isopropyl titanate, vinyl triethoxysilane and distilled water according to the mass ratio of 2.3:4.2: 100.
The antifreeze agent is propylene glycol butyl ether; the water reducing agent is a naphthalene water reducing agent; the fiber reinforcement body is made of zirconia fiber; the early strength agent is calcium formate.
2. A preparation method of frost-resistant concrete for buildings comprises the following steps:
s1, accurately weighing the raw materials according to the specified weight parts, processing the raw materials into raw materials meeting the production requirements, and storing the raw materials for later use;
s2, transferring portland cement, river sand, fly ash, gangue powder, modified AR glass fiber, modified pyrophyllite fine powder and a water reducing agent into concrete mixing equipment, mixing and stirring the materials in the mixing equipment at a speed of 100r/min for 5min to obtain a first mixture;
s3, adding the silicon dioxide aerogel nano powder, the polyvinyl alcohol fibers and the reinforcing fibers into another concrete mixing device, mixing and stirring the materials in the mixing device at a speed of 120r/min for 5min to obtain a second mixture;
s4, transferring the first mixture and the second mixture into a concrete mixer, adding the rest raw materials into the mixer, and mixing and stirring the mixture at the speed of 300r/min for 20min to obtain the finished product of the anti-freezing concrete for the building.
Example 2:
1. the antifreezing concrete for the building comprises the following raw materials in parts by weight: 650 parts of portland cement, 500 parts of river sand, 100 parts of fly ash, 70 parts of coal gangue powder, 60 parts of modified AR glass fiber, 55 parts of modified pyrophyllite fine powder, 40 parts of silica aerogel nano powder, 30 parts of polyvinyl alcohol fiber, 45 parts of slaked lime, 20 parts of sodium bicarbonate, 18 parts of rosin thermopolymer air entraining agent, 25 parts of antifreezing agent, 20 parts of water reducing agent, 30 parts of reinforcing fiber, 650 parts of early strength agent and 600 parts of water.
The preparation method of the modified AR glass fiber comprises the following steps:
a. adding a silane coupling agent into an 80% ethanol solution according to the standard of 40g/L, carrying out ultrasonic mixing for 9min, then placing AR glass fiber with the mass being 18 times that of the silane coupling agent into a mixed component obtained after the ultrasonic mixing, then adding potassium persulfate with the mass being 4% of that of the AR glass fiber and dibutyltin dilaurate with the mass being 2.8% of that of the AR glass fiber into the mixed component, and carrying out ultrasonic stirring for 12 min;
b. b, transferring the mixture obtained in the step a into a reaction kettle, carrying out heat preservation reaction for 7 hours at the temperature of 55 ℃, taking out the AR glass fiber after the reaction is finished, and washing away the silane coupling agent remained on the surface of the AR glass fiber by using absolute ethyl alcohol; then placing the alcohol-washed AR glass fiber in a constant-temperature drying oven, and drying the AR glass fiber at the temperature of 55 ℃; and obtaining a finished product of the modified AR glass fiber.
The air entraining agent is alkyl benzene sulfonate.
The preparation method of the modified pyrophyllite fine powder comprises the following steps:
grinding pyrophyllite into fine powder with the particle size of 150 meshes, soaking the fine powder in hydrochloric acid solution with the concentration of 1.2mol/L, then performing ultrasonic dispersion on the fine powder for 12min, filtering the pyrophyllite fine powder, and cleaning the pyrophyllite fine powder to be neutral by using distilled water; after cleaning, soaking the pyrophyllite powder in a modification solution at the temperature of 70 ℃, standing for 4 hours at constant temperature, filtering out the pyrophyllite powder, and drying to obtain modified pyrophyllite powder;
wherein the modified liquid is prepared by mixing and stirring triisostearoyl isopropyl titanate, vinyl triethoxysilane and distilled water according to the mass ratio of 3.0:4.5: 110.
The antifreeze is ethylene glycol butyl ether acetate; the water reducing agent is a polycarboxylic acid water reducing agent; the fiber reinforcement body is basalt fiber; the early strength agent is urea.
2. The method for producing the frost resistant concrete for construction is the same as in example 1.
Example 3:
1. the antifreezing concrete for the building comprises the following raw materials in parts by weight: 700 parts of portland cement, 550 parts of river sand, 120 parts of fly ash, 80 parts of coal gangue powder, 70 parts of modified AR glass fiber, 63 parts of modified pyrophyllite fine powder, 45 parts of silica aerogel nano powder, 36 parts of polyvinyl alcohol fiber, 55 parts of slaked lime, 24 parts of sodium bicarbonate, 20 parts of rosin thermopolymer air entraining agent, 30 parts of antifreezing agent, 25 parts of water reducing agent, 34 parts of reinforcing fiber, 700 parts of early strength agent and 680 parts of water.
The preparation method of the modified AR glass fiber comprises the following steps:
a. adding a silane coupling agent into an ethanol solution with the concentration of 85% according to the standard of 50g/L, carrying out ultrasonic mixing for 10min, then placing AR glass fiber with the mass being 20 times that of the silane coupling agent into a mixed component obtained after ultrasonic mixing, then adding potassium persulfate with the mass being 5% of the AR glass fiber and dibutyltin dilaurate with the mass being 3.5% of the AR glass fiber into the mixed component, and carrying out ultrasonic stirring for 15 min;
b. b, transferring the mixture obtained in the step a into a reaction kettle, carrying out heat preservation reaction for 8 hours at the temperature of 60 ℃, taking out the AR glass fiber after the reaction is finished, and washing away the silane coupling agent remained on the surface of the AR glass fiber by using absolute ethyl alcohol; then placing the alcohol-washed AR glass fiber in a constant-temperature drying oven, and drying the AR glass fiber at the temperature of 60 ℃; and obtaining a finished product of the modified AR glass fiber.
The air entraining agent is rosin thermopolymer air entraining agent.
The preparation method of the modified pyrophyllite fine powder comprises the following steps:
grinding pyrophyllite into fine powder with the particle size of 200 meshes, soaking the pyrophyllite into hydrochloric acid solution with the concentration of 1.5mol/L, then performing ultrasonic dispersion on the pyrophyllite for 15min, filtering the pyrophyllite fine powder, and cleaning the pyrophyllite fine powder to be neutral by using distilled water; after cleaning, soaking the pyrophyllite powder in a modified solution at the temperature of 80 ℃, standing for 5 hours at constant temperature, filtering out the pyrophyllite powder, and drying to obtain modified pyrophyllite powder;
wherein the modified liquid is prepared by mixing and stirring triisostearoyl isopropyl titanate, vinyl triethoxysilane and distilled water according to the mass ratio of 3.5:4.8: 120.
The antifreeze agent is propylene glycol butyl ether; the water reducing agent is a naphthalene water reducing agent; the fiber reinforcement body is made of zirconia fiber; the early strength agent is calcium formate.
2. The method for producing the frost resistant concrete for construction is the same as in example 1.
And (3) performance detection:
comparative example: concrete produced by Nanjing concrete production company:
the concrete produced by the examples 1 to 3 and the concrete in the comparative example provided by the invention are respectively detected for anti-freezing performance according to the requirements of the standard 'mechanical performance test method standard on common concrete'.
Testing the slump of the fresh concrete: adding the concrete into a steel test mould, moving the steel test mould on a vibration table for vibration for 30s until the surface of the concrete is full of slurry. And (3) standing at room temperature for 24 hours, then removing the mold, and then placing the concrete sample into a standard curing box, wherein the temperature of the curing box is set to be 20 ℃, and the humidity is set to be 98%. And after curing for 28d, taking out the test piece for testing. The mechanical properties and the freezing resistance of the concrete produced in the comparative example and the example are respectively measured; the resulting assay data are reported in the following table:
from the relevant data in the table above, it can be seen that: compared with the concrete produced by the comparative example, the concrete produced by the invention has increased compressive strength and splitting tensile strength, and has frost resistance to the antifreezing concrete. Compared with the comparative example, the frost resistance, the compressive strength and the splitting tensile strength of the concrete in the examples 1 to 3 are all obviously improved. The concrete prepared by the method has better performance and is more suitable for popularization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (9)
1. The antifreezing concrete for the building is characterized in that: the composite material is prepared from the following raw materials in parts by weight: 600-700 parts of portland cement, 450-550 parts of river sand, 90-120 parts of fly ash, 65-80 parts of gangue powder, 55-70 parts of modified AR glass fiber, 48-63 parts of modified pyrophyllite fine powder, 35-45 parts of silica aerogel nano powder, 25-36 parts of polyvinyl alcohol fiber, 36-55 parts of hydrated lime, 16-24 parts of sodium bicarbonate, 15-20 parts of rosin thermopolymer air entraining agent, 20-30 parts of antifreezing agent, 18-25 parts of water reducing agent, 25-34 parts of reinforcing fiber, 600-700 parts of early strength agent and 560-680 parts of water.
2. A frost-resistant concrete for construction according to claim 1, wherein: the preparation method of the modified AR glass fiber comprises the following steps:
a. adding a silane coupling agent into an ethanol solution with the concentration of 70-85% according to the standard of 30-50 g/L, carrying out ultrasonic mixing for 8-10 min, then placing AR glass fibers with the mass being 15-20 times that of the silane coupling agent into a mixed component obtained after the ultrasonic mixing, then adding potassium persulfate with the mass being 3-5% of the AR glass fibers and dibutyltin dilaurate with the mass being 2.0-3.5% into the mixed component, and carrying out ultrasonic stirring for 10-15 min;
b. b, transferring the mixture obtained in the step a into a reaction kettle, carrying out heat preservation reaction for 6-8 hours at 50-60 ℃, taking out the AR glass fiber after the reaction is finished, and washing away the silane coupling agent remained on the surface of the AR glass fiber by using absolute ethyl alcohol; then placing the alcohol-washed AR glass fiber in a constant-temperature drying oven, and drying the AR glass fiber at the temperature of 50-60 ℃; and obtaining a finished product of the modified AR glass fiber.
3. A frost-resistant concrete for construction according to claim 1, wherein: the air entraining agent is any one of rosin thermopolymer air entraining agents and alkyl benzene sulfonate air entraining agents.
4. A frost-resistant concrete for construction according to claim 1, wherein: the preparation method of the modified pyrophyllite fine powder comprises the following steps:
grinding pyrophyllite into fine powder with the particle size of 100-200 meshes, soaking the fine powder in hydrochloric acid solution with the concentration of 1.0-1.5 mol/L, then performing ultrasonic dispersion on the fine powder for 10-15 min, filtering the pyrophyllite fine powder, and cleaning the pyrophyllite fine powder to be neutral by using distilled water; after cleaning, soaking the pyrophyllite powder in a modification solution at the temperature of 65-80 ℃, standing at constant temperature for 3-5 h, filtering out the pyrophyllite powder, and drying to obtain modified pyrophyllite powder;
wherein the modified liquid is prepared by mixing and stirring triisostearoyl isopropyl titanate, vinyl triethoxysilane and distilled water according to the mass ratio of 2.3-3.5: 4.2-4.8: 100-120.
5. A frost-resistant concrete for construction according to claim 1, wherein: the antifreezing agent is any one of propylene glycol butyl ether and ethylene glycol butyl ether acetate.
6. A frost-resistant concrete for construction according to claim 1, wherein: the water reducing agent is any one of a naphthalene water reducing agent and a polycarboxylic acid water reducing agent.
7. A frost-resistant concrete for construction according to claim 1, wherein: the fiber reinforcement body is any one of zirconia fiber and basalt fiber.
8. A frost-resistant concrete for construction according to claim 1, wherein: the early strength agent is any one of calcium formate and urea.
9. The preparation method of the antifreezing concrete for buildings as claimed in any one of claims 1 to 8, wherein the method comprises the following steps:
s1, accurately weighing the raw materials according to the specified weight parts, processing the raw materials into raw materials meeting the production requirements, and storing the raw materials for later use;
s2, transferring portland cement, river sand, fly ash, gangue powder, modified AR glass fiber, modified pyrophyllite fine powder and a water reducing agent into concrete mixing equipment, mixing and stirring the materials in the mixing equipment at a speed of 100-180 r/min for 5-10 min to obtain a first mixture;
s3, adding the silicon dioxide aerogel nano powder, the polyvinyl alcohol fibers and the reinforcing fibers into another concrete mixing device, mixing and stirring the materials in the mixing device at a speed of 120-200 r/min for 5-10 min, and then marking as a second mixture;
s4, transferring the first mixture and the second mixture into a concrete mixer, adding the rest raw materials into the concrete mixer, and mixing and stirring at the speed of 300-500 r/min for 20-30 min to obtain the finished frost-resistant concrete for buildings.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110071701.4A CN112624711A (en) | 2021-01-19 | 2021-01-19 | Anti-freezing concrete for building and preparation method thereof |
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| CN202110071701.4A CN112624711A (en) | 2021-01-19 | 2021-01-19 | Anti-freezing concrete for building and preparation method thereof |
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| CN113650132A (en) * | 2021-08-19 | 2021-11-16 | 武汉理工大学 | A kind of artificial rock material suitable for negative temperature environment and preparation method thereof |
| CN114524644A (en) * | 2022-03-11 | 2022-05-24 | 南京林业大学 | Industrial solid waste polymer anti-seepage and anti-freezing material and preparation method thereof |
| CN118562338A (en) * | 2024-08-01 | 2024-08-30 | 湖南安图丽新材料科技有限公司 | Aerogel heat insulation coating applied to building wall surface and preparation method thereof |
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| CN113650132A (en) * | 2021-08-19 | 2021-11-16 | 武汉理工大学 | A kind of artificial rock material suitable for negative temperature environment and preparation method thereof |
| CN114524644A (en) * | 2022-03-11 | 2022-05-24 | 南京林业大学 | Industrial solid waste polymer anti-seepage and anti-freezing material and preparation method thereof |
| CN118562338A (en) * | 2024-08-01 | 2024-08-30 | 湖南安图丽新材料科技有限公司 | Aerogel heat insulation coating applied to building wall surface and preparation method thereof |
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