CN113480227A - Method for improving weather resistance of sand aerated concrete and sand aerated concrete product with good weather resistance - Google Patents
Method for improving weather resistance of sand aerated concrete and sand aerated concrete product with good weather resistance Download PDFInfo
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- CN113480227A CN113480227A CN202110927491.4A CN202110927491A CN113480227A CN 113480227 A CN113480227 A CN 113480227A CN 202110927491 A CN202110927491 A CN 202110927491A CN 113480227 A CN113480227 A CN 113480227A
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/30—Condensation polymers of aldehydes or ketones
- C04B24/302—Phenol-formaldehyde condensation polymers
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/30—Condensation polymers of aldehydes or ketones
- C04B24/305—Melamine-formaldehyde condensation polymers
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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
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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
- C04B2111/40—Porous or lightweight 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
The invention discloses a method for improving weather resistance of sand aerated concrete and a sand aerated concrete product with good weather resistance. The invention has the capability of enhancing the weather resistance of the concrete while realizing the enhancement of the strength of the aerated concrete by adding the thermosetting resin, is particularly suitable for producing products such as sand aerated building blocks, sand aerated wallboards, sand aerated plates and the like, and has great application potential.
Description
Technical Field
The invention relates to a method for improving weather resistance of sand aerated concrete, and also relates to a sand aerated concrete product with good weather resistance, belonging to the technical field of sand aerated concrete.
Technical Field
The sand-air concrete as a novel building material with excellent performance is prepared by using sand, cement, fly ash, water, a foaming agent, lime, gypsum and the like as main raw materials and through the working procedures of foaming and shaping, steam-pressure forming and the like. The sand aerated concrete has incomparable advantages compared with other building materials: the sand aerated concrete has the advantages of light weight, good heat preservation and insulation effects, good sound insulation and noise reduction functions, good heat resistance and fire resistance, and high strength utilization coefficient. In addition, the sand aerated concrete also has the advantages of economy, easy processing and the like. The sand aerated concrete has been widely applied in China by virtue of the unique advantages thereof, such as: sand aerated building blocks (autoclaved lightweight sand aerated self-insulation building blocks, autoclaved lightweight sand aerated high-precision building blocks), sand aerated wall boards (inner wall boards, outer wall boards, floor boards, anti-cracking boards), sand aerated plates and the like. In practical engineering application, the sand aerated concrete not only bears the load effect, but also is influenced by various environmental factors, such as temperature change, freeze-thaw damage and the like, and the weather resistance of the sand aerated concrete is poor due to the problems. The material has the defects of multiple pores, low density, high hardness, low toughness, high hydrophilicity, high hydrophobicity and low density, so that the freeze-thaw resistance and the weather resistance are poor, and the normal use of engineering structures is seriously influenced due to structural damage caused by poor weather resistance under adverse environmental conditions.
Since the production of the sand-air-entrained concrete, a large number of researchers improve the physical properties and the mechanical properties of the sand-air-entrained concrete from the aspects of different selections of cementing materials, gas generators, additives, curing modes and the like, and the sand-air-entrained concrete is continuously improved and better applied through theoretical analysis and scientific research experiments. However, the time for the large-scale popularization and use of the sand aerated concrete in China is still short, so that the research on the weather resistance of the sand aerated concrete is less at present, if the understanding on the weather resistance of the aerated concrete is lacked, the hidden trouble of poor durability caused by the fact that relevant work is not done during engineering construction is not done, a large amount of capital is needed for maintenance in the later use process, even unnecessary casualties and huge economic losses are caused, and the research on the weather resistance of the sand aerated concrete has positive significance for the popularization of the sand aerated concrete.
Disclosure of Invention
Aiming at the defects of poor freezing and thawing resistance, poor weather resistance and the like of the existing sand aerated concrete, the invention provides the method for improving the weather resistance of the sand aerated concrete.
The specific technical scheme of the invention is as follows:
a method for increasing the weather resistance of sand aerated concrete comprises the following steps: in the preparation process of the sand aerated concrete, thermosetting resin powder is added into the basic raw material to improve the weather resistance of the sand aerated concrete.
Furthermore, the sand aerated concrete is prepared by blending thermosetting resin powder and concrete base raw materials, the inorganic-organic synergistic effect is realized by introducing the organic thermosetting resin powder, the defects of inorganic materials of the sand aerated concrete are overcome, the advantages of the organic materials are exerted, after the thermosetting resin powder is added into the sand aerated concrete, the hydrophobic capacity of the concrete is increased through high-temperature crosslinking and shaping, the internal structure of the sand aerated concrete is improved, the freeze-thaw resistance of the concrete is improved, and the weather resistance of the sand aerated concrete is improved.
Further, the base materials are necessary for preparing the sand aerated concrete, and the base materials can be selected from the schemes disclosed in the prior art, such as sand, cement, fly ash, water, foaming agent, lime, gypsum and the like, and various formulas of the sand aerated concrete reported in the prior art can be used as the base materials of the invention.
Further, the basic raw materials comprise cement, gypsum, lime, aluminum powder, waste slurry and mortar. The waste slurry is prepared by grinding unqualified sand aerated concrete products or cutting leftovers of the sand aerated concrete products by a ball mill and mixing the ground waste slurry with water with equal mass. The mortar is prepared by grinding sand by a ball mill and then adding water with equal mass to mix.
Further, the dosage relation of the cement, the gypsum, the lime, the aluminum powder, the waste slurry and the mortar can refer to the dosage disclosed in the prior art, and in a specific embodiment of the invention, the mass ratio of the cement, the gypsum, the lime, the aluminum powder, the waste slurry and the mortar is 18-22: 3-6: 12-18: 2-5: 5-10: 50.
further, the thermosetting resin powder is linear resin, preferably one or two of melamine formaldehyde resin powder and phenolic resin powder. Preferably, the thermosetting resin powder is a mixture of melamine formaldehyde resin powder and phenolic resin powder in a mass ratio of 1-3: 1.
Furthermore, the thermosetting resin powder accounts for 0.1-5% of the total mass of the basic raw materials, and the basic raw materials are calculated by dry materials.
Further, the preparation method of the sand aerated concrete adopts a traditional high-temperature steam pressing process, thermosetting resin powder and basic raw materials are mixed, and then the mixture is foamed and shaped, demoulded and shaped, and steam-pressed and formed together, so that the sand aerated concrete with good weather resistance is obtained.
Furthermore, constant-temperature foaming is adopted for foaming, the temperature is 50-90 ℃, and the optimal temperature is 85 ℃. The foaming time is 2-6h, preferably 4 h.
Further, the demolding and shaping means that the shape of the sample is trimmed by cutting and the like, and the cut waste materials can be recycled as basic raw materials.
Further, carrying out steam pressing in a steam pressing kettle, wherein the steam pressing adopts high-temperature steam pressing, the steam pressing temperature is 180-200 ℃, and the preferred steam pressing temperature is 190 ℃. The steam pressing time is 12-20 h, preferably 14 h.
The invention also provides a sand aerated concrete product with good weather resistance, which is prepared from 0.1-5% of the mass of the basic raw material and thermosetting resin powder, wherein the basic raw material is calculated by dry materials.
Further, the sand aerated concrete product can be a building block, a wallboard or a plate.
The invention has the following beneficial effects:
1. the invention utilizes the thermosetting resin to improve the weather resistance of the sand aerated concrete, the method only adds the thermosetting resin into the basic raw material, the basic raw material and the preparation process do not need to be greatly improved, the operation is simple, the characteristics of the organic polymer can be exerted, the weather resistance of the product is increased, the quality of the product is improved, and thus, the sand aerated concrete material is more widely applied.
2. The mechanism of improving the weather resistance of the sand aerated concrete by the thermosetting resin is as follows: the thermosetting resin is crosslinked and cured at high temperature, so that the toughness of concrete is improved; on the other hand, the thermosetting resin has certain hydrophobic property, and forms a layer of protective film on the pores in the aerated concrete, so that the water in the concrete is not easy to store, and the water adsorbed by the concrete is not easy to enter the interior of the concrete through the pores. Thereby improving the weather resistance of the concrete.
3. The invention has the capability of enhancing the weather resistance of the concrete while realizing the enhancement of the strength of the aerated concrete by adding the thermosetting resin, is particularly suitable for producing products such as sand aerated building blocks, sand aerated wallboards, sand aerated plates and the like, and has great application potential. The invention optimizes the type of the thermosetting resin through experiments, and the performance of the preferable thermosetting resin in the aspects is better.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be exemplary only and are not intended to be limiting.
In the following examples, the proportions are all mass percentages unless otherwise specified.
Example 1
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the mixture is taken as a basic raw material, then phenolic resin powder is added into the basic raw material, the mixture is uniformly stirred, and the dosage of the phenolic resin powder is 0.1 percent of the total mass (calculated by dry materials) of the basic raw material;
4. pouring the uniformly stirred materials into a mould, and foaming for 6 hours at the constant temperature of 50 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) steaming and pressing the statically-cured concrete material in a still kettle at a high temperature of 180 ℃ for 20 hours to obtain a sand aerated concrete block product 1, wherein the size of the block is 600 x 240 x 200 mm.
Example 2
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the raw materials are mixed to be used as basic raw materials, then, melamine formaldehyde resin powder is added into the basic raw materials, the mixture is stirred uniformly, and the dosage of the melamine formaldehyde resin powder is 1 percent of the total mass (calculated by dry materials) of the basic raw materials;
4. pouring the uniformly stirred materials into a mould, and foaming for 4 hours at constant temperature of 85 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 190 ℃ for 14h to obtain a sand aerated concrete block product 2, wherein the size of the block is 600 x 240 x 200 mm.
Example 3
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the raw materials are mixed to be used as basic raw materials, then, melamine formaldehyde resin powder is added into the basic raw materials, the mixture is uniformly stirred, and the dosage of the melamine formaldehyde resin powder is 5 percent of the total mass (calculated by dry materials) of the basic raw materials;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 3, wherein the size of the block is 600 x 240 x 200 mm.
Example 4
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: mixing the raw materials by the mass ratio of 50 to obtain a base raw material, adding melamine formaldehyde resin powder and phenolic resin into the base raw material, and uniformly mixing and stirring, wherein the dosage of the melamine formaldehyde resin powder is 2.5% of the total mass (calculated by dry materials) of the base raw material, and the dosage of the phenolic resin powder is 2.5% of the total mass (calculated by dry materials) of the base raw material;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 4, wherein the size of the block is 600 x 200 x 100 mm.
Example 5
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 mm to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the mixture is taken as a basic raw material, then, the melamine formaldehyde resin powder and the phenolic resin are added into the basic raw material, the mixture is uniformly stirred, the dosage of the melamine formaldehyde resin powder is 3.7 percent of the total mass (calculated by dry materials) of the basic raw material, and the dosage of the phenolic resin powder is 1.3 percent of the total mass (calculated by dry materials) of the basic raw material;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 5, wherein the size of the block is 600 x 200 x 100 mm.
Example 6
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the mixture is taken as a basic raw material, then phenolic resin powder is added into the basic raw material, the mixture is uniformly stirred, and the dosage of the phenolic resin powder is 1 percent of the total mass (calculated by dry materials) of the basic raw material;
4. pouring the uniformly stirred materials into a mould, and foaming for 6 hours at the constant temperature of 50 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) steaming and pressing the statically-cured concrete material in a still kettle at a high temperature of 180 ℃ for 20 hours to obtain a sand aerated concrete block product 6, wherein the size of the block is 600 x 200 x 100 mm.
Comparative example 1
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: stirring and mixing uniformly according to the mass ratio of 50;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 7, wherein the size of the block is 600 x 200 x 100 mm.
Comparative example 2
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the mixture is used as a basic raw material, then thermosetting resin, namely phenol and furfural resin powder, is added into the basic raw material, and the mixture is uniformly stirred, wherein the dosage of the phenol and furfural resin powder is 5 percent of the total mass (calculated by dry materials) of the basic raw material;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 8, wherein the size of the block is 600 x 200 x 100 mm.
Comparative example 3
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the raw materials are mixed to be used as basic raw materials, then thermosetting resin, namely bisphenol A epoxy resin powder is added into the basic raw materials, the mixture is uniformly stirred, and the using amount of the bisphenol A epoxy resin powder is 5 percent of the total mass (calculated by dry materials) of the basic raw materials;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 9 with the block size of 600 x 200 x 100 mm.
Comparative example 4
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the mixture is taken as a basic raw material, then thermoplastic acrylic resin powder is added into the basic raw material, the mixture is uniformly stirred, and the using amount of the thermoplastic acrylic resin powder is 5 percent of the total mass (calculated by dry materials) of the basic raw material;
4. pouring the uniformly stirred materials into a mould, and foaming for 2 hours at the constant temperature of 90 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 200 ℃ for 12 hours to obtain a sand aerated concrete block product 10, wherein the size of the block is 600 x 200 x 100 mm.
The performances of the sand aerated concrete blocks prepared in the above examples and comparative examples are characterized, and the test method is according to the national standard (GB/T11968-2020).
The results are shown in table 1 below:
from the performance of the product, various performances of the building block can be effectively improved by adding the melamine formaldehyde resin powder and the phenolic resin powder, and particularly the freeze-thaw resistance of the product is improved. When the melamine formaldehyde resin powder and the phenolic resin powder are compounded for use, the performance is better.
Example 7
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the raw materials are mixed to be used as basic raw materials, then, melamine formaldehyde resin powder is added into the basic raw materials, the mixture is stirred uniformly, and the dosage of the melamine formaldehyde resin powder is 1 percent of the total mass (calculated by dry materials) of the basic raw materials;
4. pouring the uniformly stirred materials into a mould, and foaming for 4 hours at constant temperature of 85 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 190 ℃ for 14 hours to obtain a sand aerated concrete wallboard product 11 with the size of 4800X 600X 150 mm.
The basic properties of the resulting wallboard are shown in table 2 below.
Example 8
1. Adding the sand aerated concrete leftover into a ball mill for grinding, adding water with equal mass in the ball milling process, and performing ball milling until the particle size is below 45 millimeters to obtain waste slurry;
2. mixing silica sand and water with equal mass in a ball mill, and ball-milling until the particle size is below 45 mm to obtain mortar;
3. mixing cement, gypsum, lime, aluminum powder, waste slurry and mortar according to the proportion of 20: 5: 15: 3: 7: 50 mass percent of the raw materials are mixed to be used as basic raw materials, then, melamine formaldehyde resin powder is added into the basic raw materials, the mixture is stirred uniformly, and the dosage of the melamine formaldehyde resin powder is 1 percent of the total mass (calculated by dry materials) of the basic raw materials;
4. pouring the uniformly stirred materials into a mould, and foaming for 4 hours at constant temperature of 85 ℃;
5. demolding and shaping after foaming is finished, and standing;
6. and (3) autoclaving the statically-cured concrete material in an autoclave at the high temperature of 190 ℃ for 14h to obtain a sand aerated concrete plate product 12 with the plate size of 4800 x 600 x 120 mm.
The basic properties of the resulting panel are shown in Table 3 below.
Claims (10)
1. A method for increasing the weather resistance of sand aerated concrete is characterized by comprising the following steps: in the preparation process of the sand aerated concrete, thermosetting resin powder is added into the basic raw material to improve the weather resistance of the sand aerated concrete.
2. The method of claim 1, further comprising: the thermosetting resin powder is one or two of melamine formaldehyde resin powder and phenolic resin powder; preferably, the thermosetting resin powder is a mixture of melamine formaldehyde resin powder and phenolic resin powder in a mass ratio of 1-3: 1.
3. A method according to claim 1 or 2, characterized by: mixing thermosetting resin powder and a base raw material, and then jointly foaming and shaping, demolding and shaping, and carrying out autoclaved molding to obtain the sand aerated concrete with good weather resistance.
4. The method of claim 3, wherein: the basic raw materials are cement, gypsum, lime, aluminum powder, waste slurry and mortar.
5. A method according to claim 1 or 2, characterized by: the thermosetting resin powder accounts for 0.1-5% of the total mass of the basic raw materials, and the basic raw materials are calculated in dry weight.
6. The method of claim 4, wherein: the mass ratio of the cement, the gypsum, the lime, the aluminum powder, the waste slurry and the mortar is 18-22: 3-6: 12-18: 2-5: 5-10: 50; preferably, the waste slurry is waste slurry prepared by grinding unqualified sand aerated concrete products or cutting leftovers of the sand aerated concrete products by a ball mill and mixing the waste slurry with water of equal mass, and the mortar is prepared by grinding sand by the ball mill and mixing the ground sand with water of equal mass.
7. The method of claim 3, wherein: foaming is carried out at a constant temperature of 50-90 ℃, and preferably 85 ℃; and (3) carrying out steam pressing in a steam pressing kettle, wherein the steam pressing temperature is 180-200 ℃, and the preferable temperature is 190 ℃.
8. The method of claim 3 or 7, wherein: the foaming time is 2-6h, preferably 4 h; the steam pressing time is 12-20 h, preferably 14 h.
9. A sand aerated concrete product with good weatherability is characterized in that: the thermosetting resin powder is prepared from 0.1-5% of the mass of a base material and the base material in dry weight.
10. A sand aerated concrete product according to claim 9 wherein: the sand aerated concrete product is a building block, a wallboard or a plate.
Priority Applications (1)
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| CN113929419A (en) * | 2021-11-05 | 2022-01-14 | 山东天玉建材科技股份有限公司 | Preparation method of autoclaved aerated concrete/aluminum silicate composite material and obtained product |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113929419A (en) * | 2021-11-05 | 2022-01-14 | 山东天玉建材科技股份有限公司 | Preparation method of autoclaved aerated concrete/aluminum silicate composite material and obtained product |
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