CN115849944B - Aerated concrete block for building curtain wall and preparation method thereof - Google Patents
Aerated concrete block for building curtain wall and preparation method thereof Download PDFInfo
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Abstract
The application relates to the technical field of preparation of building curtain wall materials, in particular to an aerated concrete block for building and a preparation method thereof, wherein the method comprises the following raw materials, by mass, 40-80 parts of fly ash, 10-40 parts of Portland cement, 5-20 parts of lime powder, 2-5 parts of a coagulant and gypsum: 3-10 parts of aluminum powder, 0.2-1.2 parts of aluminum powder paste, 0.5-1.5 parts of stainless steel wire, 2-5 parts of polyurethane and 100-200 parts of polyurethane. The preparation method provided by the application can improve the heat preservation, sound insulation and corrosion resistance effects of the prepared aerated concrete block, improves the integral strength of the aerated concrete block to a certain extent, and prolongs the service life of the material, thereby improving the service performance of the aerated concrete block and expanding the application range. The application has obvious gain effect on improving the comprehensive performance of the aerated concrete block under the improvement of the related process and raw materials.
Description
Technical Field
The application relates to the technical field of concrete products for buildings, in particular to an aerated concrete block for a building and a preparation method thereof. The application obviously improves the service performance of the lightweight aerated concrete block by processing the porous block body of the brick, and is suitable for industrial popularization.
Background
Energy crisis is one of the great problems of the present human being, and energy conservation is highly valued as a fifth energy source for human beings. Building energy conservation plays a very important role in energy conservation work, and is an important component for implementing sustainable development strategy. The building energy conservation comprises two parts, one part is the innovation of building materials to strengthen the heat preservation and insulation capacity of the enclosure structure, and the other part is the energy conservation of heating energy sources.
The traditional stone curtain wall supporting heat insulation material mainly comprises steel and rock wool, the steel skeleton is easy to rust in a humid environment, and the rock wool heat insulation material is easy to absorb water and wet, so that the stone curtain wall supporting heat insulation material has a large limitation in engineering application. Along with the rapid development of material science and technology, materials which can be applied to the heat preservation of the outer wall of a building are gradually increased, so that the defects and defects of the traditional materials are overcome, and the material has the advantages of low cost, convenience in construction, light weight and the like, wherein the ultrathin stone with self-heat preservation adhesive property is certainly representative of novel curtain wall materials.
The curtain wall material is a main building material product with large quantity and wide range, and has close relation with land, resource energy, ecological environment and living condition. At present, the traditional clay bricks still occupy a certain amount in the construction of wall materials in China, but the production of the clay bricks consumes a large amount of land resources and coal resources, thereby causing serious environmental damage and pollution. Therefore, the innovation of wall materials is greatly promoted in China, the conditions that the traditional wall materials occupy a large amount of cultivated land, consume energy and pollute the environment are fundamentally changed, novel wall side decoration materials are greatly developed and popularized and applied to gradually take materials and occupy soil bricks, and the emerging industry which is suitable for sustainable development is an important measure for protecting land resources, saving energy, comprehensively utilizing resources and improving the environment and is also an important content of a sustainable development strategy.
In addition, the aerated concrete is a multifunctional material integrating structure and heat insulation, according to the current national energy-saving standard, only the aerated concrete is used for raising the requirement of reaching the standard of energy conservation of a single material, and any other material is required to save energy, and composite treatment such as a small-sized hollow concrete block, a reinforced concrete cast-in-situ wall body and the like is required to be combined with heat insulation materials such as polystyrene to solve the heat insulation and energy conservation problems, and the composite wall body has complex construction, long construction period and high construction cost. It follows that aerated concrete has become the dominant product to replace solid clay bricks and that aerated concrete block construction will be one of the major building systems in the future.
Through the prior art and document retrieval, the following steps are found: the patent CN105439618A discloses an autoclaved aerated concrete block, which comprises, by weight, 40-60 parts of cementing materials, 30-50 parts of siliceous materials, 1-3 parts of aluminum powder, 3-7 parts of gypsum, 5-10 parts of acrylate emulsion, 2-8 parts of detergents, 2-4 parts of foaming agents, 6-10 parts of rubber powder, 2-6 parts of sodium hydroxide, 3-7 parts of active mineral admixtures, 2-4 parts of silane coupling agents, 2-5 parts of talcum powder and 1-3 parts of water reducing agents.
Patent CN101439947a discloses an aerated concrete block and a method of making the same, the method of making comprising: the aerated concrete block consists of papermaking waste, combustion waste, quicklime, cement and gypsum, wherein the weight percentages of the components are 5-30% of papermaking waste white mud and green mud, 30-70% of combustion waste fly ash and slag, 10-25% of quicklime, 3-20% of cement and 1-5% of gypsum.
The cold insulation pipe support of hard polyurethane foam is prepared with polyfunctional organic isocyanate and mixed polyether polyol as main materials. Under the existence of catalyst and several special additives, the hard polyurethane foam plastic is produced through complex chemical reaction. In the production process of the product, the specific polyurethane raw material with larger functionality is selected, and the screening additive material and the material proportion are scientifically selected, so that the compressive strength of the product is effectively improved, the physicochemical property of the prepared cold insulation pipe support product can completely meet various requirements in the application process, and various indexes reach or exceed the technical level of similar products abroad through detection of related authorities. The flame retardant has the advantages of hydrolysis resistance, aging resistance, acid and alkali resistance and other chemical properties, is not easy to burn, and has flame retardance meeting national safety requirements.
The polyurethane thermal insulation material has the best international performance. The hard polyurethane has the excellent performances of light weight, low heat conductivity coefficient, good heat resistance, aging resistance, easy adhesion with other base materials, no generation of molten drops during combustion and the like, and is widely used as a heat insulation material for roofs, walls, ceilings, floors, doors and windows of buildings in European and American countries. About 49% of building heat insulation materials in developed countries such as Europe and America are polyurethane materials, and the proportion is less than 10% in China.
The patent achieves the aim of improving the heat preservation performance by adjusting the content of the formula. The environment protection or heat insulation and sound insulation performance of the aerated concrete block can be improved to a certain extent, the application range of the aerated concrete block is widened, however, substances added in the aerated concrete block are conventional substances, the process has no obvious difference from the conventional process, the integral performance of the aerated concrete block cannot be improved fundamentally, and the lifting effect is single. The aerated concrete block obtained by the double improvements of the technology and the components is suitable for large-scale industrial popularization.
Disclosure of Invention
The application aims to provide an aerated concrete block for a building and a preparation method thereof, and the preparation method provided by the application can improve the heat preservation, sound insulation and corrosion resistance effects of the prepared aerated concrete block, improve the overall strength of the aerated concrete block to a certain extent, and prolong the service life of the material, thereby improving the service performance of the aerated concrete block and expanding the application range. The application has obvious gain effect on improving the comprehensive performance of the aerated concrete block under the improvement of the related process and raw materials.
The application provides a preparation method of an aerated concrete block for a building curtain wall, which comprises the following steps:
adding stainless steel wires into the slurry; the slurry is obtained by mixing different raw materials;
autoclaved treatment is carried out on the mixed slurry containing the stainless steel wires to obtain bricks;
preparing polyurethane solution containing bubbles by heating and melting polyurethane and stirring air;
mixing the brick with polyurethane solution for vacuum treatment to obtain the brick internally containing polyurethane;
and (3) performing surface cleaning on the brick blocks to obtain the aerated concrete block for the target building.
Further, before the step of adding the stainless steel wire into the slurry, the method further comprises:
weighing fly ash and gypsum, and adding water for first mixing;
adding lime powder into the first mixed slurry for secondary mixing;
adding silicate cement into the second mixed slurry for third mixing;
standing and maintaining the slurry mixed for the third time;
the step of adding the stainless steel wire into the slurry comprises the following steps:
firstly, mixing and stirring aluminum powder paste, stainless steel wires and water;
adding the mixed slurry containing the stainless steel wires into the slurry after standing and curing to obtain prefabricated slurry;
the step of autoclaved treatment of the mixed slurry containing the stainless steel wires to obtain bricks comprises the following steps:
pouring the prefabricated slurry into a mould for pre-curing to obtain a blank before the kettle;
conveying the blank in front of the kettle into an autoclaved kettle, and obtaining bricks;
the step of heating and melting polyurethane and stirring air to prepare a polyurethane solution containing bubbles comprises the following steps:
heating polyurethane and stirring under air;
the step of carrying out mixing vacuum treatment on the brick and polyurethane solution to obtain the brick internally containing polyurethane comprises the following steps:
placing the brick on the upper part of the polyurethane solution;
the solution and brick were vacuum treated.
Further, the step of weighing the fly ash and the gypsum and adding water for first mixing comprises the following steps:
40-80 parts of fly ash, 10-40 parts of Portland cement, 5-20 parts of lime powder, 2-5 parts of coagulant, 3-10 parts of gypsum, 0.2-1.2 parts of aluminum powder, 0.5-1.5 parts of aluminum powder paste, 2-5 parts of stainless steel wire and 100-200 parts of polyurethane;
mixing the fly ash and the gypsum with water to prepare slurry, wherein the mass of the water is 0.3-0.9 times of the total mass of the fly ash and the gypsum.
Further, the step of weighing the fly ash and gypsum and adding water for secondary mixing comprises the following steps:
and adding the prepared slurry into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 6-15min.
Further, the step of weighing the fly ash and gypsum and adding water for third mixing comprises the following steps:
continuously adding silicate cement into the slurry, and stirring for 3-10min;
and (5) feeding the slurry into a static curing chamber, standing and curing for 50-150min to thicken the slurry, and obtaining the total slurry.
Further, the step of adding the stainless steel wire to the slurry includes:
placing aluminum powder paste and stainless steel wires with the length of 3-6mm and the diameter of 0.01-0.05mm into a stirring tank, adding water with the mass of 6-10 times of the mass of the aluminum powder paste, and uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires;
adding aluminum powder liquid into the total slurry, stirring for 3-6min, and pouring into a mold.
Further, the step of pouring the prefabricated sizing agent into a mould for pre-curing to obtain a blank before the kettle comprises the following steps:
and (3) placing the die into a pre-curing chamber at 40-70 ℃ for curing for 4-8 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain the blank before the kettle.
Further, the step of conveying the pre-kettle blank into an autoclave and obtaining bricks comprises the following steps:
and conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 1.2-3MPa in 8-25min, raising the temperature to 150-200 ℃, maintaining for 2-6h, then lowering the pressure to normal pressure in 3-15min, and then conveying out the building blocks for natural cooling.
Further, the step of heating and melting polyurethane and air-stirring to prepare a polyurethane solution containing bubbles comprises the following steps: heating the polyurethane to 180-200 ℃ and continuously stirring under air to fully mix the air with the solution;
the step of carrying out mixing vacuum treatment on the brick and polyurethane solution to obtain the brick internally containing polyurethane comprises the following steps: placing the brick body into the obtained polyurethane solution, vacuumizing, wherein the vacuum degree is 0.01-0.1Pa, and the holding time is 20-60s, so that the polyurethane seals the whole brick instead of filling the brick.
The application also provides the aerated concrete block for the building, which is prepared by adopting the preparation method.
The beneficial effects are that:
1. according to the application, the stainless steel wire is adopted as a framework of the aerated concrete block, and the stainless steel wire is doped in the aerated concrete block, so that the strength of the material is obviously improved, and the fracture resistance of the material is improved;
2. the brick is coated by polyurethane containing bubbles, so that the material has good corrosion resistance, and the porous polyurethane is beneficial to improving the sound insulation and heat preservation performance of the material;
3. the aerated concrete block is obtained by adopting vacuum treatment, so that the inside of the brick is in a nearly vacuum state, and then the brick is sealed by polyurethane, thereby greatly improving the heat preservation and sound insulation effects;
4. the technology and the raw materials used by the application are not complex, the operability is obvious, but the material effect is obviously improved.
5. The aerated concrete block prepared by the method provided by the application has the characteristics of light weight due to the innovation of the preparation process, can be used for the lamination of ultrathin stone curtain walls, further enables the light aerated concrete wall body on the outer surface of a decorated building to be adhered with the ultrathin stone curtain, has the characteristics of meeting the heat preservation and insulation effects, having low carbon and low cost, solving the defects and shortcomings of the traditional curtain wall materials, and has extremely high popularization and application values through engineering practice demonstration.
Drawings
Fig. 1 is a preparation flow chart of a preparation method of an aerated concrete block for a building curtain wall.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The application relates to a preparation method of an aerated concrete block for a building curtain wall, which comprises the following specific embodiments:
the first step: 40-80 parts of fly ash, 10-40 parts of Portland cement, 5-20 parts of lime powder, 2-5 parts of coagulant and gypsum according to the mass ratio: 3-10 parts of aluminum powder 0.2-1.2 parts of aluminum powder paste 0.5-1.5 parts of stainless steel wire 2-5 parts of polyurethane 100-200 parts;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.3-0.9 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 6-15min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 3-10min, then, feeding into a static curing room, standing and curing for 50-150min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 3-6mm and the diameter of 0.01-0.05mm into a stirring tank, adding water with the mass of 6-10 times of the mass of the aluminum powder paste, stirring uniformly to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 3-6min, and pouring into a mould;
sixth step: placing the die into a pre-curing chamber at 40-70 ℃ for curing for 4-8 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 1.2-3MPa in 8-25min, raising the temperature to 150-200 ℃, maintaining for 2-6h, then lowering the pressure to normal pressure in 3-15min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 180-200 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing, wherein the vacuum degree is 0.01-0.1Pa, and the holding time is 20-60s, so that the polyurethane seals the whole brick instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
The principle of the application is as follows: (1) The application adds the stainless steel wire into the slurry, which takes the stainless steel wire as a framework, improves the strength of the aerated concrete block, including compression resistance and clamping strength; (2) The stirring treatment of the polyurethane solution is carried out to introduce air into the polyurethane, so that the heat preservation and insulation performance of the polyurethane is improved; (3) According to the application, the polyurethane solution is used for coating the brick blocks, so that the corrosion resistance of the brick blocks is improved, and the impact resistance of the material is improved; (4) The application uses vacuum operation in the process of coating the brick by polyurethane, and aims at expanding polyurethane containing bubbles through vacuum treatment so as to coat the brick instead of filling holes of the brick; secondly, the through holes in the bricks are subjected to vacuum treatment, so that the heat preservation and sound insulation performances are improved.
Firstly, the application aims to ensure the uniform mixing of the stainless steel wires in the slurry, which requires that the stainless steel wires are as thin as possible and the length of the stainless steel wires cannot be too long, so as to avoid uneven stirring of the stainless steel wires caused by gravity sinking and intertwining; secondly, the polyurethane is ensured to contain more bubbles as much as possible in the stirring process, so that the stirring is lasting; thirdly, the polyurethane is required to be incapable of filling the holes of the brick in the vacuum treatment process, and the polyurethane content is not required to be too high, and the polyurethane has enough bubbles so as to be fully expanded in the vacuum treatment process.
In order to more clearly and definitely embody the specific flow and the inventive concept of the preparation method of the full-service holiday concrete brick provided by the application, the following examples are now provided for further explanation.
Example 1:
the preparation method of the aerated concrete block for the building curtain wall provided by the embodiment comprises the following steps:
the first step: 45 parts of fly ash, 10 parts of Portland cement, 10 parts of lime powder, 2 parts of coagulant, 4 parts of gypsum, 0.3 part of aluminum powder, 0.7 part of aluminum powder paste, 2 parts of stainless steel wire and 100 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.5 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 8min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 5min, then, feeding into a static curing room, standing and curing for 70min to thicken the mixture, and obtaining total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 3mm and the diameter of 0.01mm into a stirring tank, adding water with the mass of 6 times of the mass of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 3min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 50 ℃ for curing for 5 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclave, raising the pressure to 1.5MPa in 10min, raising the temperature to 160 ℃, maintaining for 3h, reducing the pressure to normal pressure in 5min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 180 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing to the vacuum degree of 0.01Pa for 20s, and sealing the whole brick by polyurethane instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
Example 2:
the preparation method of the aerated concrete block for the building curtain wall provided by the embodiment comprises the following steps:
the first step: 60 parts of fly ash, 25 parts of Portland cement, 15 parts of lime powder, 5 parts of coagulant, 10 parts of gypsum, 0.8 part of aluminum powder, 1.3 parts of aluminum powder paste, 5 parts of stainless steel wire and 200 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.7 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 13min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 8min, then, feeding into a static curing room, standing and curing for 110min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 6mm and the diameter of 0.05mm into a stirring tank, adding water with the mass of 10 times of the mass of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 6min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 65 ℃ for curing for 7 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 2.5MPa in 20min, raising the temperature to 180 ℃, maintaining for 5h, then lowering the pressure to normal pressure in 10min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 200 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing, wherein the vacuum degree is 0.1Pa, and the holding time is 60 seconds, so that the polyurethane seals the whole brick instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
Example 3:
the preparation method of the aerated concrete block for the building curtain wall provided by the embodiment comprises the following steps:
the first step: 50 parts of fly ash, 15 parts of Portland cement, 12 parts of lime powder, 3 parts of coagulant, 8 parts of gypsum, 0.6 part of aluminum powder, 1 part of aluminum powder paste, 3 parts of stainless steel wire and 150 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.6 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 10min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 6min, then, feeding into a static curing room, standing and curing for 90min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 4mm and the diameter of 0.03mm into a stirring tank, adding water with the mass of 8 times of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 4min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 55 ℃ for curing for 6 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 2MPa in 15min, raising the temperature to 170 ℃, maintaining for 4h, then lowering the pressure to normal pressure in 8min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 190 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing to the vacuum degree of 0.05Pa for 40s, and sealing the whole brick by polyurethane instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
Comparative example 1:
the preparation method of the aerated concrete block for the building curtain wall provided by the comparative example comprises the following steps:
the first step: 50 parts of fly ash, 15 parts of Portland cement, 12 parts of lime powder, 3 parts of a coagulant, 8 parts of gypsum, 0.6 part of aluminum powder, 1 part of aluminum powder paste and 150 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.6 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 10min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 6min, then, feeding into a static curing room, standing and curing for 90min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste into a stirring tank, adding water with the mass which is 8 times that of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 4min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 55 ℃ for curing for 6 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 2MPa in 15min, raising the temperature to 170 ℃, maintaining for 4h, then lowering the pressure to normal pressure in 8min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 190 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing to the vacuum degree of 0.05Pa for 40s, and sealing the whole brick by polyurethane instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
Comparative example 2:
the preparation method of the aerated concrete block for the building curtain wall provided by the comparative example comprises the following steps:
the first step: 50 parts of fly ash, 15 parts of Portland cement, 12 parts of lime powder, 3 parts of coagulant, 8 parts of gypsum, 0.6 part of aluminum powder, 1 part of aluminum powder paste, 3 parts of stainless steel wire and 150 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.6 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 10min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 6min, then, feeding into a static curing room, standing and curing for 90min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 4mm and the diameter of 0.03mm into a stirring tank, adding water with the mass of 8 times of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 4min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 55 ℃ for curing for 6 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 2MPa in 15min, raising the temperature to 170 ℃, maintaining for 4h, then lowering the pressure to normal pressure in 8min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 190 ℃ to melt;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing to the vacuum degree of 0.05Pa for 40s, and sealing the whole brick by polyurethane instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
The preparation method of the aerated concrete block for the building curtain wall provided by the comparative example comprises the following steps:
comparative example 3:
the first step: 50 parts of fly ash, 15 parts of Portland cement, 12 parts of lime powder, 3 parts of coagulant, 8 parts of gypsum, 0.6 part of aluminum powder, 1 part of aluminum powder paste, 3 parts of stainless steel wire and 150 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.6 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 10min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 6min, then, feeding into a static curing room, standing and curing for 90min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 4mm and the diameter of 0.03mm into a stirring tank, adding water with the mass of 8 times of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 4min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 55 ℃ for curing for 6 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 2MPa in 15min, raising the temperature to 170 ℃, maintaining for 4h, then lowering the pressure to normal pressure in 8min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 190 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: putting the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
Comparative example 4:
the preparation method of the aerated concrete block for the building curtain wall provided by the comparative example comprises the following steps:
the first step: 50 parts of fly ash, 15 parts of Portland cement, 12 parts of lime powder, 3 parts of coagulant, 8 parts of gypsum, 0.6 part of aluminum powder, 1 part of aluminum powder paste, 3 parts of stainless steel wire and 150 parts of polyurethane;
and a second step of: mixing the fly ash and the gypsum with water according to the mass ratio to prepare slurry, wherein the mass of the water is 0.6 times of the total mass of the fly ash and the gypsum;
and a third step of: adding the slurry prepared in the step 2 into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 10min;
fourth step: adding silicate cement in the mass ratio into the third step, stirring for 6min, then, feeding into a static curing room, standing and curing for 90min to thicken the silicate cement to obtain total slurry;
fifth step: placing aluminum powder paste and stainless steel wires with the length of 10mm and the diameter of 0.3mm into a stirring tank, adding water with the mass of 8 times of the mass of the aluminum powder paste, uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires, adding the aluminum powder liquid into the total slurry in the step four, stirring for 4min, and pouring into a die;
sixth step: placing the die into a pre-curing chamber at 55 ℃ for curing for 6 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain a blank before the kettle;
seventh step: conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 2MPa in 15min, raising the temperature to 170 ℃, maintaining for 4h, then lowering the pressure to normal pressure in 8min, and then conveying out the building blocks for natural cooling;
eighth step: heating the polyurethane to 190 ℃ and continuously stirring under air to fully mix the air with the solution;
ninth step: placing the brick body obtained in the seventh step into the polyurethane solution obtained in the eighth step, vacuumizing to the vacuum degree of 0.05Pa for 40s, and sealing the whole brick by polyurethane instead of filling the brick;
tenth step: and (3) cleaning the surface of the brick containing polyurethane obtained in the ninth step to obtain a finished product.
Table 1:
table 1 shows that the addition of stainless steel wire in aerated concrete blocks has a significant improvement in the compressive strength of the material, while the lower in comparative example four is a decrease in strength due to significant internal defects caused by the excessive addition of stainless steel wire. The water absorption, the sound insulation effect and the heat insulation performance of the brick surface are obviously improved after the polyurethane coating is coated on the brick surface, but the polyurethane cannot be coated on the brick surface when the polyurethane does not contain bubbles or is not subjected to vacuum treatment.
While embodiments of the present application have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (9)
1. The preparation method of the aerated concrete block for the building curtain wall is characterized by comprising the following steps of:
adding stainless steel wires into the slurry; the slurry is obtained by mixing different raw materials;
autoclaved treatment is carried out on the mixed slurry containing the stainless steel wires to obtain bricks;
preparing polyurethane solution containing bubbles by heating and melting polyurethane and stirring air;
performing mixed vacuum treatment on the brick and polyurethane solution;
the aerated concrete block for the building curtain wall is obtained by carrying out surface cleaning on the brick blocks;
the step of heating and melting polyurethane and stirring air to prepare a polyurethane solution containing bubbles comprises the following steps: heating the polyurethane to 180-200 ℃ and continuously stirring under air to fully mix the air with the solution;
the step of carrying out mixed vacuum treatment on the brick and the polyurethane solution comprises the following steps: placing the brick body into the obtained polyurethane solution, vacuumizing, wherein the vacuum degree is 0.01-0.1Pa, and the holding time is 20-60s, so that the polyurethane seals the whole brick instead of filling the brick.
2. The method for preparing an aerated concrete block for a building curtain wall according to claim 1, wherein before the step of adding stainless steel wires to the slurry, the method further comprises:
40-80 parts of fly ash, 10-40 parts of Portland cement, 5-20 parts of lime powder, 2-5 parts of coagulant, 3-10 parts of gypsum, 0.2-1.2 parts of aluminum powder, 0.5-1.5 parts of aluminum powder paste, 2-5 parts of stainless steel wire and 100-200 parts of polyurethane;
weighing fly ash and gypsum, and adding water for first mixing;
adding lime powder into the first mixed slurry for secondary mixing;
adding silicate cement into the second mixed slurry for third mixing;
standing and maintaining the slurry mixed for the third time;
the step of adding the stainless steel wire into the slurry comprises the following steps:
firstly, mixing and stirring aluminum powder paste, stainless steel wires and water;
adding the mixed slurry containing the stainless steel wires into the slurry after standing and curing to obtain prefabricated slurry;
the step of autoclaved treatment of the mixed slurry containing the stainless steel wires to obtain bricks comprises the following steps:
pouring the prefabricated slurry into a mould for pre-curing to obtain a blank before the kettle;
conveying the blank in front of the kettle into an autoclaved kettle, and obtaining bricks;
the step of heating and melting polyurethane and stirring air to prepare a polyurethane solution containing bubbles comprises the following steps:
heating polyurethane and stirring under air;
the step of carrying out mixing vacuum treatment on the brick and polyurethane solution to obtain the brick internally containing polyurethane comprises the following steps:
placing the brick on the upper part of the polyurethane solution;
the solution and brick were vacuum treated.
3. The method for preparing the aerated concrete block for the building curtain wall, which is characterized in that the method for preparing the aerated concrete block for the building curtain wall is as claimed in claim 2, wherein the method comprises the following steps: the step of weighing the fly ash and the gypsum and adding water for first mixing comprises the following steps:
mixing the fly ash and the gypsum with water to prepare slurry, wherein the mass of the water is 0.3-0.9 times of the total mass of the fly ash and the gypsum.
4. The method for preparing the aerated concrete block for the building curtain wall, which is characterized in that the method for preparing the aerated concrete block for the building curtain wall is as claimed in claim 2, wherein the method comprises the following steps: the step of second mixing includes:
adding the first mixed slurry prepared by the first mixing into a stirrer for stirring, and adding the lime powder in the mass ratio in the stirring process for 6-15min.
5. The method for preparing the aerated concrete block for the building curtain wall, which is characterized in that the method for preparing the aerated concrete block for the building curtain wall is as claimed in claim 2, wherein the method comprises the following steps: the third mixing and the step of standing and curing the third mixed slurry comprise the following steps:
continuously adding silicate cement into the second mixed slurry obtained by the second mixing, and stirring for 3-10min;
and (5) feeding the mixture into a static curing room, standing and curing for 50-150min to thicken the mixture, and obtaining total slurry.
6. The method for preparing the aerated concrete block for the building curtain wall, which is characterized in that the method for preparing the aerated concrete block for the building curtain wall is as claimed in claim 2, wherein the method comprises the following steps: the step of adding the stainless steel wire into the slurry comprises the following steps:
placing aluminum powder paste and stainless steel wires with the length of 3-6mm and the diameter of 0.01-0.05mm into a stirring tank, adding water with the mass of 6-10 times of the mass of the aluminum powder paste, and uniformly stirring to obtain aluminum powder liquid containing the stainless steel wires;
adding aluminum powder liquid into the total slurry obtained after standing and curing, stirring for 3-6min, and pouring into a mold.
7. The method for preparing the aerated concrete block for the building curtain wall, which is characterized in that the method for preparing the aerated concrete block for the building curtain wall is as claimed in claim 2, wherein the method comprises the following steps: pouring the prefabricated sizing agent into a mould for pre-curing to obtain a blank before the kettle, wherein the method comprises the following steps of:
and (3) placing the die into a pre-curing chamber at 40-70 ℃ for curing for 4-8 hours, forming a stable blank, demolding, and cutting according to the required specification to obtain the blank before the kettle.
8. The method for preparing the aerated concrete block for the building curtain wall, which is characterized in that the method for preparing the aerated concrete block for the building curtain wall is as claimed in claim 2, wherein the method comprises the following steps: the step of conveying the pre-kettle blank into the autoclave to obtain bricks comprises the following steps:
conveying the blank before the kettle into an autoclaved kettle, raising the pressure to 1.2-3MPa in 8-25min, raising the temperature to 150-200 ℃, maintaining for 2-6h, then lowering the pressure to normal pressure in 3-15min, and then conveying out the building blocks for natural cooling.
9. Aerated concrete blocks for construction prepared by the preparation method according to any one of claims 1 to 8.
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