CN111807807A - Non-autoclaved lightweight heat-insulating particle aerated concrete block and preparation method thereof - Google Patents
Non-autoclaved lightweight heat-insulating particle aerated concrete block and preparation method thereof Download PDFInfo
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- CN111807807A CN111807807A CN202010744439.0A CN202010744439A CN111807807A CN 111807807 A CN111807807 A CN 111807807A CN 202010744439 A CN202010744439 A CN 202010744439A CN 111807807 A CN111807807 A CN 111807807A
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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
- C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali 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
- 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
- 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
- C04B28/06—Aluminous 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
- 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
Abstract
The invention discloses a non-autoclaved lightweight heat-insulating particle aerated concrete block and a preparation method thereof, wherein the aerated concrete block comprises the following components: 50-100 parts of cement, 0-37.5 parts of fly ash, 0-12.5 parts of slag micro powder, 0-50 parts of light particles, 2-8 parts of foaming agent, 0-5 parts of coagulant, 0.025-0.175 part of foam stabilizer, 0.2-1.4 parts of water reducer, 0.1-0.7 part of water repellent, 0-0.6 part of fiber and 30-60 parts of water. The aerated concrete block has the advantages of light weight, heat preservation and insulation, energy conservation, high strength, simple maintenance process and low cost, and solves the problems of unsatisfactory heat preservation and insulation performance and complex maintenance process of the conventional aerated concrete block.
Description
Technical Field
The invention relates to the technical field of aerated concrete block preparation, in particular to a non-autoclaved lightweight heat-insulating particle aerated concrete block and a preparation method thereof.
Background
According to the prediction, the world energy demand is increasing year by 2%, and the large consumption of energy has a great influence on the environment, the economy and the life of people. For China, the building energy consumption accounts for about 30% of the total energy consumption of China, and is a main growth point of the energy consumption of China, wherein the energy conservation of walls is the core problem of the energy conservation of buildings. The novel wall material with light development weight, high strength, good heat insulation performance and comprehensive functions is not only the general trend of wall material development, but also the requirement of ensuring the sustainable development of economy and society.
The traditional clay brick and other small-sized building blocks have poor heat insulation performance, serious environmental pollution and high required labor intensity, and can not meet the requirements of energy conservation and environmental protection. The novel wall material with light development weight, high strength, good heat insulation performance and comprehensive functions is not only the general trend of wall material development, but also the requirement of ensuring the sustainable development of economy and society. The aerated concrete block is a light porous material made up by using calcareous materials of cement, lime and gypsum, etc. and siliceous materials of quartz sand and flyash, etc. as main raw materials, adding proper quantity of foaming agent and several additives, and adopting the processes of adding water, stirring, gas-forming expansion, casting and forming, standing still and foaming, precuring and cutting, high-temp. The building self-insulation fireproof composite board has the advantages of wide source of manufacturing materials, stable material, light weight, easiness in processing, convenience in construction, low manufacturing cost, good heat preservation, heat insulation, sound insulation and fire resistance and the like, has excellent self-insulation, self-heat insulation and self-fireproof functions, and can play a greater role in the field of building energy conservation. However, the aerated concrete is easy to crack and has high water absorption rate, and the strength, the durability and the heat preservation performance of the aerated concrete are adversely affected. And the most common curing mode of the aerated concrete is autoclaved curing, the process is complex, the price of an autoclave and the operating maintenance cost are high, and the cost is not reduced.
Disclosure of Invention
In view of the above, the invention aims to provide a non-autoclaved lightweight heat-insulating particle aerated concrete block and a preparation method thereof, so that the non-autoclaved lightweight heat-insulating particle aerated concrete block has the advantages of light weight, heat insulation, energy conservation, high strength, simple maintenance process and low cost, and the problems of unsatisfactory heat insulation performance and complex maintenance process of the conventional aerated concrete block are solved.
The invention solves the problems through the following technical means:
the non-autoclaved lightweight heat-insulating particle aerated concrete block comprises the following components in parts by weight: 50-100 parts of cement, 0-37.5 parts of fly ash, 0-12.5 parts of slag micro powder, 0-50 parts of light particles, 2-8 parts of foaming agent, 0-5 parts of coagulant, 0.025-0.175 part of foam stabilizer, 0.2-1.4 parts of water reducer, 0.1-0.7 part of water repellent, 0-0.6 part of fiber and 30-60 parts of water.
Preferably, the composition comprises the following components: 55-90 parts of cement, 7.5-33.75 parts of fly ash, 2.5-11.25 parts of slag micro powder, 5-35 parts of light particles, 2-6 parts of foaming agent, 2-5 parts of coagulant, 0.075-0.15 part of foam stabilizer, 0.4-1.4 parts of water reducing agent, 0.2-0.6 part of water repellent, 0.2-0.5 part of fiber and 40-55 parts of water.
Preferably, the composition comprises the following components: 60-80 parts of cement, 15-30 parts of fly ash, 5-10 parts of slag micro powder, 10-30 parts of light particles, 3-5 parts of foaming agent, 2-4 parts of coagulant, 0.075-0.125 part of foam stabilizer, 0.6-1.2 parts of water reducing agent, 0.3-0.5 part of water repellent, 0.3-0.5 part of fiber and 40-50 parts of water.
Further, the cement is portland cement or aluminate cement.
Further, the foaming agent is one or more of hydrogen peroxide and aluminum powder.
Further, the coagulant is one or more of aluminum sulfate, sodium silicate and sodium carbonate.
Further, the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and methyl cellulose ether.
Further, the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high-efficiency water reducing agent, a ketone aldehyde condensate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent.
Further, the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane.
Further, the fiber is one or more of polypropylene fiber, glass fiber, basalt fiber and carbon fiber.
A method of making an aerated concrete block comprising the steps of:
1) weighing cement, fly ash, slag micro powder, light particles, a foaming agent, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers to obtain a solid material;
4) adding a coagulant and a water reducing agent into water, and uniformly mixing to obtain a liquid material;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding a foaming agent, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the light particles subjected to the pre-wetting treatment into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry is foamed, covering a thin plastic film on the surface of the sample to prevent water from evaporating, curing for 24h at the temperature of 18-22 ℃, removing the mold, and putting the sample into a standard curing box for curing for 26-30 days.
The invention has the beneficial effects that:
the lightweight particle aerated concrete is prepared by compounding cement, fly ash, slag micropowder, lightweight particles, a foaming agent, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water. The cement added in the invention is ordinary portland cement or aluminate cement, and the adoption of the ordinary portland cement or the aluminate cement is beneficial to improving the structural compactness and the durability and reducing the cost. The added mineral admixture is fly ash and slag micropowder, and the addition of the mineral admixture is favorable for generating more and more uniform micropores, reducing microcracks, reducing volume weight and heat conductivity coefficient and improving compressive strength. The added light particles are ceramsite, EPS particles and active magnesium oxide consolidation particles, the diameter of the ceramsite is 5-15mm, the diameter of the EPS particles is 2-7mm, and the diameter of the active magnesium oxide consolidation particles is 5-15mm, so that the strength of aerated concrete can be improved, and the heat insulation performance can be improved while the light weight is ensured. The invention adds the coagulant to control the initial setting time and the final setting time of the cement mortar, so that the setting hardening speed is matched with the foaming speed. The foam stabilizer is added to reduce the surface tension between solid-liquid and gas-liquid interfaces, improve the stability of the foam film, facilitate the foaming stability and form a uniform and fine microporous structure. The invention adds the water reducing agent to control the consistency of the slurry, so that the consistency is in a reasonable range, the crack is reduced, and the strength is improved. The invention adds the water repellent to reduce the water absorption rate and improve the waterproof performance, thereby improving the strength and the heat insulation performance. The invention adds the fiber to improve the early crack resistance and the toughness of the mortar, thereby improving the crack resistance and the durability of the aerated concrete product. In a word, the non-autoclaved lightweight heat-insulating particle aerated concrete block prepared by the technical scheme of the application has the advantages of light dead weight, good heat-insulating property, strong durability and good waterproof property, and also solves the problems of complex curing process and difficult preparation. In addition, the application has the following advantages:
1. when the slurry is prepared, the dry material and the wet material are respectively stirred uniformly and then mixed and stirred, so that the materials can be fully and uniformly dispersed, and the hydrogen peroxide can be uniformly foamed.
2. The maintenance process adopts standard maintenance, is simple and convenient, is simple to operate, is beneficial to industrial production and reduces the cost.
3. The components adopt waste such as fly ash and slag micropowder, the purpose of recycling the waste is achieved, and the environment is protected.
4. The material is convenient to obtain, the cost is low, the material obtaining is not limited by regions, the mass production can be realized in the whole country, the volume weight is low, the weight is light, the transportation and the use are convenient, and the working efficiency of workers can be greatly improved.
Compared with the traditional wall material, the prepared ceramsite aerated concrete has the advantages of low cost, light weight, high strength, good waterproof performance and heat insulation performance, is an economic and safe green heat insulation building material, and is beneficial to promoting building energy conservation.
Detailed Description
The present invention will be described in further detail below with reference to examples. The features and advantages of the present invention will become more apparent from the description. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
Example 1
The non-autoclaved lightweight heat-insulating particle aerated concrete block comprises the following components in parts by weight: 650g of cement, 262.5g of fly ash, 87.5g of slag micro powder, 100g of light particles (ceramsite, EPS particles and active magnesium oxide consolidated particles), 40g of hydrogen peroxide, 30g of coagulant, 1g of foam stabilizer, 8g of water reducing agent, 4g of water repellent, 4g of fiber and 400g of water. The cement is ordinary aluminate cement; the coagulant is one or more of aluminum sulfate, sodium silicate and sodium carbonate; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and methyl cellulose ether; the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high-efficiency water reducing agent, a ketone aldehyde condensate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent; the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane; the fiber is one or more of polypropylene fiber, glass fiber, basalt fiber and carbon fiber.
The method for preparing the non-autoclaved lightweight heat-insulating particle aerated concrete block by adopting the composition comprises the following steps:
1) weighing cement, fly ash, slag micro powder, light particles, hydrogen peroxide, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers;
4) adding the coagulant and the water reducing agent into water and uniformly mixing;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, simultaneously scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding hydrogen peroxide, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the light particles subjected to the pre-wetting treatment into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry foaming is finished, covering a thin plastic film on the surface of the sample to prevent water evaporation, curing for 24h at the temperature of 18 ℃, removing the mold, and putting the sample into a standard curing box for curing for 26 days.
Example 2
The non-autoclaved lightweight heat-insulating particle aerated concrete block comprises the following components in parts by weight: 66g of cement, 262.9g of fly ash, 90g of slag micropowder, 140g of light particles (ceramsite, EPS particles and active magnesium oxide consolidated particles), 41g of hydrogen peroxide, 32g of coagulant, 1.2g of foam stabilizer, 9g of water reducer, 4.2g of water repellent, 4.3g of fiber and 410g of water. The cement is ordinary portland cement; the coagulant is one or more of aluminum sulfate, sodium silicate and sodium carbonate; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and methyl cellulose ether; the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high-efficiency water reducing agent, a ketone aldehyde condensate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent; the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane; the fiber is one or more of polypropylene fiber, glass fiber, basalt fiber and carbon fiber.
The method for preparing the non-autoclaved lightweight heat-insulating particle aerated concrete block by adopting the composition comprises the following steps:
1) weighing cement, fly ash, slag micro powder, ceramsite, hydrogen peroxide, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers;
4) adding the coagulant and the water reducing agent into water and uniformly mixing;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, simultaneously scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding hydrogen peroxide, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the pre-wetted ceramsite into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry foaming is finished, covering a thin plastic film on the surface of the sample to prevent water evaporation, curing for 24h at the temperature of 22 ℃, removing the mold, and putting the sample into a standard curing box for curing for 30 days.
Example 3
The non-autoclaved lightweight heat-insulating particle aerated concrete block comprises the following components in parts by weight: 670g of cement, 273.5g of fly ash, 90.25g of slag micropowder, 180g of light particles (ceramsite, EPS particles and active magnesium oxide consolidated particles), 42g of hydrogen peroxide, 35g of coagulant, 1.35g of foam stabilizer, 9.6g of water reducer, 4.4g of water repellent, 4.6g of fiber and 420g of water. The cement is ordinary portland cement or aluminate cement; the coagulant is one or more of aluminum sulfate, sodium silicate and sodium carbonate; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and methyl cellulose ether; the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high-efficiency water reducing agent, a ketone aldehyde condensate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent; the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane; the fiber is one or more of polypropylene fiber, glass fiber, basalt fiber and carbon fiber.
The method for preparing the non-autoclaved lightweight heat-insulating particle aerated concrete block by adopting the composition comprises the following steps:
1) weighing cement, fly ash, slag micro powder, ceramsite, hydrogen peroxide, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers;
4) adding the coagulant and the water reducing agent into water and uniformly mixing;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, simultaneously scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding hydrogen peroxide, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the pre-wetted ceramsite into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry foaming is finished, covering a thin plastic film on the surface of the sample to prevent water evaporation, maintaining for 24h at the temperature of 20 ℃, removing the mold, and placing the sample into a standard maintenance box for maintenance for 28 days.
Example 4
The non-autoclaved lightweight heat-insulating particle aerated concrete block comprises the following components in parts by weight: 550g of cement, 75g of fly ash, 25g of slag micro powder, 50g of light particles (ceramsite, EPS particles and active magnesium oxide consolidated particles), 20g of aluminum powder, 20g of coagulant, 0.75g of foam stabilizer, 4g of water reducer, 2g of water repellent, 2g of fiber and 400g of water. The cement is ordinary portland cement or aluminate cement; the coagulant is one or more of aluminum sulfate, sodium silicate and sodium carbonate; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and methyl cellulose ether; the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high-efficiency water reducing agent, a ketone aldehyde condensate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent; the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane; the fiber is one or more of polypropylene fiber, glass fiber, basalt fiber and carbon fiber.
The method for preparing the non-autoclaved lightweight heat-insulating particle aerated concrete block by adopting the composition comprises the following steps:
1) weighing cement, fly ash, slag micro powder, ceramsite, hydrogen peroxide, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers;
4) adding the coagulant and the water reducing agent into water and uniformly mixing;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, simultaneously scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding hydrogen peroxide, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the pre-wetted ceramsite into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry foaming is finished, covering a thin plastic film on the surface of the sample to prevent water evaporation, maintaining for 24h at the temperature of 20 ℃, removing the mold, and placing the sample into a standard maintenance box for maintenance for 28 days.
Example 5
The non-autoclaved lightweight heat-insulating particle aerated concrete block comprises the following components in parts by weight: 800g of cement, 300g of fly ash, 100g of slag micro powder, 300g of light particles (ceramsite, EPS particles and active magnesium oxide consolidated particles), 50g of hydrogen peroxide, 40g of coagulant, 1.25g of foam stabilizer, 12g of water reducer, 6g of water repellent, 5g of fiber and 500g of water. The cement is ordinary portland cement or aluminate cement; the coagulant is one or more of aluminum sulfate, sodium silicate and sodium carbonate; the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether and methyl cellulose ether; the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high-efficiency water reducing agent, a ketone aldehyde condensate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent; the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane; the fiber is one or more of polypropylene fiber, glass fiber, basalt fiber and carbon fiber.
The method for preparing the non-autoclaved lightweight heat-insulating particle aerated concrete block by adopting the composition comprises the following steps:
1) weighing cement, fly ash, slag micro powder, light particles, hydrogen peroxide, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers;
4) adding the coagulant and the water reducing agent into water and uniformly mixing;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, simultaneously scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding hydrogen peroxide, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the light particles subjected to the pre-wetting treatment into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry foaming is finished, covering a thin plastic film on the surface of the sample to prevent water evaporation, maintaining for 24h at the temperature of 20 ℃, removing the mold, and placing the sample into a standard maintenance box for maintenance for 28 days.
The detection of the relevant performance is respectively determined according to GB/T11968-.
The results are shown in the following table:
TABLE 1 non-autoclaved lightweight insulation particle aerated concrete block test results
In Table 1, L-2, L-3, L-4 and L-5 are respectively performance testing items of the non-autoclaved lightweight insulation particle aerated concrete block prepared by the method of the embodiment 1-5. As can be seen from Table 1, the apparent density of the autoclaved lightweight heat-insulating particle aerated concrete block prepared by the invention is less than 550 kg.m-328 days compressive strength is more than 3.5MPa, and heat conductivity coefficient is less than 0.08W (m.K)-1The water absorption is lower than 25 percent, the interconnected porosity is lower than 20 percent, and the cost is lower than 350 yuan/m3. The granular aerated concrete block prepared by the invention is free from autoclaved curing, simple in curing process, excellent in working performance, lower in density, excellent in heat preservation and heat insulation performance, good in energy-saving effect, low in cost, simple to operate and beneficial to industrial production.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The non-autoclaved lightweight heat-insulating particle aerated concrete block is characterized by comprising the following components in parts by weight: 50-100 parts of cement, 0-37.5 parts of fly ash, 0-12.5 parts of slag micro powder, 0-50 parts of light particles, 2-8 parts of foaming agent, 0-5 parts of coagulant, 0.025-0.175 part of foam stabilizer, 0.2-1.4 parts of water reducer, 0.1-0.7 part of water repellent, 0-0.6 part of fiber and 30-60 parts of water.
2. The non-autoclaved lightweight thermal insulation particle aerated concrete block as claimed in claim 1, which comprises the following components in parts by weight: 55-90 parts of cement, 7.5-33.75 parts of fly ash, 2.5-11.25 parts of slag micro powder, 5-35 parts of light particles, 2-6 parts of foaming agent, 2-5 parts of coagulant, 0.075-0.15 part of foam stabilizer, 0.4-1.4 parts of water reducing agent, 0.2-0.6 part of water repellent, 0.2-0.5 part of fiber and 40-55 parts of water.
3. The non-autoclaved lightweight thermal insulation particle aerated concrete block as claimed in claim 1, which comprises the following components in parts by weight: 60-80 parts of cement, 15-30 parts of fly ash, 5-10 parts of slag micro powder, 10-30 parts of light particles, 3-5 parts of foaming agent, 2-4 parts of coagulant, 0.075-0.125 part of foam stabilizer, 0.6-1.2 parts of water reducing agent, 0.3-0.5 part of water repellent, 0.3-0.5 part of fiber and 40-50 parts of water.
4. The non-autoclaved lightweight thermal insulating aerated concrete block according to claim 1, wherein the foaming agent is one or more of hydrogen peroxide and aluminum powder.
5. The non-autoclaved lightweight thermal insulating particulate aerated concrete block according to claim 1, wherein the set accelerator is one or more of aluminum sulfate, sodium silicate, sodium carbonate.
6. The autoclaved lightweight insulating particulate aerated concrete block of claim 1, wherein the foam stabilizer is one or more of hydroxypropyl methyl cellulose ether, hydroxyethyl cellulose ether, methyl cellulose ether.
7. The non-autoclaved lightweight thermal insulation particle aerated concrete block according to claim 1, characterized in that the water reducing agent is one or more of an aromatic sulfonate formaldehyde condensate high efficiency water reducing agent, a ketone aldehyde condensate high efficiency water reducing agent, and a polycarboxylate high efficiency water reducing agent.
8. The non-autoclaved lightweight thermal insulating granular aerated concrete block as claimed in claim 1, wherein the water repellent is one or more of calcium stearate, styrene-acrylic emulsion, potassium methyl silicate and hydrophobic siloxane.
9. The non-autoclaved lightweight insulation particle aerated concrete block according to claim 1, wherein the fibers are one or more of polypropylene fibers, glass fibers, basalt fibers, carbon fibers.
10. A method of making an aerated concrete block comprising the steps of:
1) weighing cement, fly ash, slag micro powder, light particles, a foaming agent, a coagulant, a foam stabilizer, a water reducing agent, a water repellent, fibers and water in parts by weight;
2) carrying out pre-wetting treatment on the light particles in a spraying mode;
3) uniformly mixing cement, fly ash, slag micro powder, a foam stabilizer, a water repellent and fibers to obtain a solid material;
4) adding a coagulant and a water reducing agent into water, and uniformly mixing to obtain a liquid material;
5) stirring solid materials in a low-speed mode, simultaneously adding the uniformly mixed liquid materials into a stirring pot at a constant speed, fully stirring for 120s, stopping stirring for 15s, scraping slurry on blades and the pot wall into the stirring pot, stirring for 120s at a high speed, then adding a foaming agent, stirring for 15s at a low speed, and stirring for 15s at a high speed;
6) adding the light particles subjected to the pre-wetting treatment into a stirring pot, quickly stirring for 30s, injecting into a mold for molding, standing and foaming;
7) after the slurry is foamed, covering a thin plastic film on the surface of the sample to prevent water from evaporating, curing for 24h at the temperature of 18-22 ℃, removing the mold, and putting the sample into a standard curing box for curing for 26-30 days.
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| CN113149552A (en) * | 2021-04-15 | 2021-07-23 | 王逵 | Polypropylene fiber concrete and production process thereof |
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| CN115572116A (en) * | 2022-09-21 | 2023-01-06 | 新疆金磊建材股份有限公司 | Homogeneous particle self-heat-insulation building block and preparation method thereof |
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