CN109265123B - Fly ash autoclaved aerated concrete block and production method thereof - Google Patents
Fly ash autoclaved aerated concrete block and production method thereof Download PDFInfo
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- CN109265123B CN109265123B CN201811425125.3A CN201811425125A CN109265123B CN 109265123 B CN109265123 B CN 109265123B CN 201811425125 A CN201811425125 A CN 201811425125A CN 109265123 B CN109265123 B CN 109265123B
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- 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
- C04B28/14—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 calcium sulfate cements
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Abstract
The invention relates to the technical field of building material preparation, and discloses a fly ash autoclaved aerated concrete block and a production method thereof, wherein the raw materials comprise materials and water, and the materials comprise 3000-3500 parts of fly ash; lime 350-400 parts; 250 portions and 320 portions of gypsum; cement 280 and 330; 2-4 parts of aluminum powder; 100 portions of additive and 180 portions of additive; the additive comprises butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer and calcium stearoyl lactylate. The invention has the following advantages and effects: the industrial waste residue fly ash is used as a raw material, so that the discharge amount is reduced, and the environment is protected; the additive in the raw materials not only enhances the hydrophobicity of pores of the fly ash autoclaved aerated concrete block and reduces the water absorption amount of the fly ash autoclaved aerated concrete block from coated mortar, but also effectively reduces the drying shrinkage value of the block and the deformation amount of the block in the drying process, and achieves the effects of environmental protection, small drying shrinkage value, difficult cracking and hollowing after being built into a wall body and the like.
Description
Technical Field
The invention belongs to the technical field of building material preparation, and particularly relates to a fly ash autoclaved aerated concrete block and a production method thereof.
Technical Field
With the development of society and huge energy consumption, building energy conservation becomes a worldwide trend, and new requirements on novel wall materials are also provided. The autoclaved aerated concrete is a light porous building material which is prepared by taking siliceous materials and calcareous materials as main raw materials, mixing the main raw materials in proportion, adding water and stirring, adding a gas former and other materials, and then carrying out the procedures of pouring, standing, blank cutting, autoclaved curing and the like.
However, after the autoclaved aerated concrete blocks are built into a wall body, the wall body is easy to crack. As shown in the study on the water absorption characteristics of the autoclaved aerated concrete block published in the 4 th volume of 29 of the university of wuhan theory of wushu, 4 months in 2007, by zhouchun et al, the aerated concrete block directly absorbs water from mortar after masonry or plastering, so that the mortar is dry and difficult to hydrate and harden normally, the bonding force between the mortar and the block is reduced, and severe damages such as cracking, hollowing and falling off of the mortar are caused.
Disclosure of Invention
The invention aims to provide a fly ash autoclaved aerated concrete block which has the effect of less water absorption from mortar in use.
The technical purpose of the invention is realized by the following technical scheme: the fly ash autoclaved aerated concrete block comprises the following raw materials in percentage by mass: water 1: 0.55-0.6; the material comprises the following components, 3000 portions and 3500 portions of fly ash; lime 350-400 parts; 250 portions and 320 portions of gypsum; cement 280 and 330; 2-4 parts of aluminum powder; 100 portions of additive and 180 portions of additive; the additive comprises butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer and calcium stearoyl lactate, and the mass ratio of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer is as follows: and 4-6:1 of stearoyl calcium lactate.
By adopting the technical scheme, the raw materials of the fly ash autoclaved aerated concrete block comprise materials and water, and the water-material ratio is the concept of aerated concrete, namely the mass ratio of the water to the materials. The water-material ratio is too small to cause 'suffocation', the water-material ratio is too large to collapse easily, the reasonable water-material ratio is directly related to the quality of aerated concrete products, and the proper water-material ratio not only meets the requirements of chemical reactions of raw materials, but also meets the requirements of pouring, gas generation and molding. The materials of the invention are as follows: the water is 1:0.55-0.6, the water-material ratio is 0.55-0.6, and the requirements of chemical reaction of raw materials and the requirements of pouring, gas generation and forming can be better met.
The fly ash is fine ash captured from flue gas generated after coal combustion, is main solid waste discharged from a coal-fired power plant, comprises main oxides of silicon dioxide, aluminum oxide, ferrous oxide, ferric oxide, calcium oxide, titanium dioxide and the like, and is one of industrial waste residues with large discharge in China. The fly ash is used as one of materials, so that the discharge amount of the fly ash is reduced, and the environment is protected.
The cement is used as a cementing material to complement lime, so that necessary calcium oxide is provided for reaction, and the pouring stability and the strength of a product can be improved. Lime provides main calcareous raw material calcium oxide for reaction, and the product of the reaction of the calcium oxide, silicon dioxide, aluminum oxide and the like ensures the strength of the product. Calcium hydroxide generated by the reaction of lime and water can react with aluminum powder and generate gas. The gypsum has double functions, and can react with water, obviously improve the strength of the product, reduce the shrinkage and improve the carbonization coefficient; but also can play a good role in delaying the digestion of lime in the casting process. Aluminum powder is used as a gas former.
The additive comprises butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer and calcium stearoyl lactylate, the butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer has good film forming property, and the calcium stearoyl lactylate is white to cream-colored powder, thin slice or block and has lipophilicity. The stearoyl calcium lactate and the butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propanesulfonic acid terpolymer are mixed and then dispersed in the fly ash autoclaved aerated concrete block, so that the lipophilicity and the hydrophobicity of the fly ash autoclaved aerated concrete block are improved, and the water absorption of pores of the fly ash autoclaved aerated concrete block is properly inhibited under the condition that the molding of the fly ash autoclaved aerated concrete block is not influenced. When the fly ash autoclaved aerated concrete block is used for building a wall body, the water absorbed by pores of the fly ash autoclaved aerated concrete block from the coated mortar or concrete slurry is reduced, so that the coated mortar or concrete slurry can be normally hydrated and hardened, the binding force of the mortar or concrete slurry and the fly ash autoclaved concrete block is improved, and the conditions of cracking, hollowing and the like when the fly ash autoclaved concrete block is used for building the wall body are reduced.
The fly ash autoclaved aerated concrete block mainly has the deformation of condensation shrinkage, dry shrinkage deformation, compression shrinkage, temperature deformation and creep deformation, wherein the dry shrinkage deformation is the main deformation reason of the fly ash autoclaved aerated concrete block. On one hand, a large amount of moisture exists in the fly ash autoclaved aerated concrete block during autoclaved curing, then in the transportation and storage processes, due to the existence of a large amount of pores, moisture can be absorbed from the environment, and then part of moisture is inevitably absorbed from the coated mortar or concrete slurry during wall building, so that the internal moisture of the fly ash autoclaved aerated concrete block is more, the water absorption property of the fly ash autoclaved aerated concrete block is good, the water drainage property of the fly ash autoclaved aerated concrete block is poor, and the moisture in the block can be discharged in a long time; on the other hand, the fly ash autoclaved aerated concrete block has a large drying shrinkage value, so that the fly ash autoclaved aerated concrete block can deform greatly in the process that the moisture in the fly ash autoclaved aerated concrete block is gradually lost after the wall body is built. But the drying shrinkage of mortar or concrete bonded with the fly ash autoclaved aerated concrete block is small, so that the fly ash autoclaved aerated concrete block is slightly deformed. Even if the mortar or concrete and the fly ash autoclaved aerated concrete block have strong cohesive force, the difference between the drying shrinkage deformation of the mortar or concrete and the drying shrinkage deformation of the fly ash autoclaved aerated concrete block is large during drying shrinkage, and further the mortar or concrete and the fly ash autoclaved aerated concrete block crack to form the phenomena of wall cracking, hollowing and the like.
The stearoyl calcium lactate and the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer in the additive are dispersed in the raw materials of the fly ash autoclaved aerated concrete block, can be combined with other materials in the raw materials, can form a film on the inner wall of a pore of the fly ash autoclaved aerated concrete block, can improve the dimensional stability of the fly ash autoclaved concrete block, remarkably reduce the drying shrinkage value of the fly ash autoclaved aerated concrete block, effectively reduce the difference between the drying shrinkage value of mortar or concrete and the drying shrinkage value of the fly ash autoclaved aerated concrete block, and reduce the phenomena of cracking, hollowing and the like of a built wall body.
The invention is further provided with: materials: water 1: 0.56.
by adopting the technical scheme, the chemical reaction requirement of the raw materials can be better met when the mass ratio of the materials to the water is 1: 0.56.
The invention is further provided with: the materials comprise 3300 parts of fly ash, 380 parts of lime and 300 parts of cement in parts by weight.
The invention is further provided with: the material comprises 2.2 parts of aluminum powder by weight.
The invention is further provided with: butyl acrylate/vinyl acetate/2-acrylamido-2-methylpropanesulfonic acid terpolymer in mass ratio: and 5:1 of stearoyl calcium lactate.
The invention is further provided with: the preparation method of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer comprises the following steps of mixing, by weight, 180-195 parts of butyl acrylate and 180-195 parts of vinyl acetate to obtain a reagent A; mixing 15-20 parts of 2-acrylamide-2-methylpropanesulfonic acid with 15 parts of water to obtain a reagent B; dissolving 2-3 parts of potassium persulfate in 10 parts of water to obtain a reagent C; taking 4-6 parts of ethoxylated nonylphenol sulfosuccinate disodium salt, 1-2 parts of sodium stearyl lactate and 3-4 parts of sodium dodecyl sulfate, and mixing to obtain a reagent D; mixing 0.01 part of methylene bisacrylamide with 2 parts of water to obtain a reagent E; mixing two thirds of the reagent A and two thirds of the reagent B, adding the reagent D and the reagent E, emulsifying for 15min by using a high-speed shearing emulsifier, transferring the obtained emulsion into a three-neck flask, carrying out water bath at 80 ℃, adding the two thirds of the reagent C, reacting for 10-30min, then adding the remaining one third of the reagent A and one third of the reagent B, then adding one third of the reagent C, carrying out heat preservation for 50-70min, discharging to obtain emulsion, and adding ammonia water until the emulsion is alkaline to obtain the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer.
The invention is further provided with: the additive also comprises sorbitan monostearate, and the mass ratio of the sorbitan monostearate: 1:1 of stearoyl calcium lactate.
By adopting the technical scheme, the additive also comprises sorbitan monostearate which is also named as span 60 and is light yellow to tawny waxy solid. The sorbitan monostearate is dispersed in the raw material of the fly ash autoclaved aerated concrete and can be combined with butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer in the raw material, so that the hydrophobicity of pores of the fly ash autoclaved aerated concrete block is improved.
The invention is further provided with: the additive also comprises manganese oxide, wherein the mass ratio of manganese oxide: and (3) 1: 2 of stearoyl calcium lactate.
By adopting the technical scheme, the manganese oxide is combined with the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer and dispersed in the raw materials of the fly ash autoclaved aerated concrete block, so that the drying shrinkage value of the fly ash autoclaved aerated concrete block can be further reduced.
The invention is further provided with: the material also comprises 30-40 parts of bentonite.
By adopting the technical scheme, the bentonite is dispersed in the raw materials of the fly ash autoclaved aerated concrete block, so that the combination of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer and other materials can be promoted, and the effect of further reducing the drying shrinkage value of the fly ash autoclaved aerated concrete block is achieved.
The invention also provides a production method of the fly ash autoclaved aerated concrete block, which comprises the following steps of firstly, screening fly ash, levigating the fly ash, screening by using a screen, and weighing the fly ash with a formula amount; step two, pulping, namely uniformly mixing the fly ash and water with the formula amount of 97-99% to obtain slurry; step three, proportioning, namely weighing lime, gypsum, cement and an additive, and adding the weighed lime, gypsum, cement and additive into the slurry; weighing aluminum powder and water with the formula amount of 1-3%, uniformly mixing to obtain a mixed solution, adding the mixed solution into the slurry, and uniformly stirring to obtain a mixture; step four, molding, namely injecting the mixture into a mold; standing, namely standing the mixture in a mold for 90min, and taking out the mixture from the mold to obtain a semi-finished product; step six, cutting, namely cutting the taken semi-finished product; and seventhly, steam curing, namely placing the cut semi-finished product into a steam curing kettle for steam curing, wherein the steam curing time is 5-10 hours, the steam curing temperature is 160-180 ℃, and the pressure in the steam curing kettle is 0.8-1.2MPa, so that the fly ash autoclaved aerated concrete block is obtained after steam curing.
The invention has the beneficial effects that: 1. the water-material ratio of the fly ash autoclaved aerated concrete raw material is 0.55-0.6, so that the requirements of chemical reaction, pouring and molding of the raw material can be better met; 2. the butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer and the stearoyl calcium lactate in the additive are dispersed in the fly ash autoclaved aerated concrete, so that the water absorption of pores of the fly ash autoclaved aerated concrete block can be properly inhibited, the water absorption of the fly ash autoclaved aerated concrete block from the coated mortar or concrete slurry is reduced, the coated mortar or concrete slurry can be normally hydrated and hardened, and the binding force between the mortar or concrete slurry and the fly ash autoclaved aerated concrete block is improved; 3. the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer and the stearoyl calcium lactate in the additive can also reduce the drying shrinkage value of the fly ash autoclaved aerated concrete block, reduce the deformation amount of the drying shrinkage, further reduce the phenomena of cracking, hollowing and the like caused by the separation between the fly ash autoclaved aerated concrete block and mortar or concrete slurry, and achieve the effects of environmental protection, small drying shrinkage value, and difficult cracking, hollowing and the like after a wall body is built.
Detailed Description
Example 1: the fly ash autoclaved aerated concrete block comprises the following raw materials in percentage by mass: water 1:0.56, and the ingredients in the feed are shown in table 1. Wherein the additive comprises 100kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer and 20kg of calcium stearoyl lactylate.
The preparation method of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer comprises the following steps: mixing 180 parts of butyl acrylate and 180 parts of vinyl acetate according to parts by weight to obtain a reagent A; mixing 15 parts of 2-acrylamido-2-methylpropanesulfonic acid with 15 parts of water to obtain a reagent B; dissolving 2 parts of potassium persulfate in 10 parts of water to obtain a reagent C; taking 4 parts of ethoxylated nonylphenol sulfosuccinate disodium salt, 1 part of sodium stearyl lactate and 3 parts of sodium dodecyl sulfate, and mixing to obtain a reagent D; mixing 0.01 part of methylene bisacrylamide with 2 parts of water to obtain a reagent E; mixing two thirds of the reagent A and two thirds of the reagent B, adding the reagent D and the reagent E, emulsifying for 15min by using a high-speed shearing emulsifier, transferring the obtained emulsion into a three-neck flask, carrying out water bath at 80 ℃, adding the two thirds of the reagent C, reacting for 10min, then adding the remaining one third of the reagent A and one third of the reagent B, adding one third of the reagent C, carrying out heat preservation for 50min, discharging to obtain emulsion, and adding ammonia water until the emulsion is alkaline to obtain the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer.
The production method of the fly ash autoclaved aerated concrete block comprises the following steps of firstly, screening fly ash, finely grinding the fly ash, screening by using a screen, and weighing the fly ash with the formula amount; step two, pulping, namely uniformly mixing the fly ash and water with the formula amount of 97% to obtain slurry; step three, proportioning, namely weighing lime, gypsum, cement and an additive, and adding the weighed lime, gypsum, cement and additive into the slurry; weighing aluminum powder and 3% of water according to the formula amount, uniformly mixing to obtain a mixed solution, adding the mixed solution into the slurry, and uniformly stirring to obtain a mixture; step four, molding, namely injecting the mixture into a mold; standing, namely standing the mixture in a mold for 90min, and taking out the mixture from the mold to obtain a semi-finished product; step six, cutting, namely cutting the taken semi-finished product; and seventhly, steam curing, namely placing the cut semi-finished product into a steam curing kettle for steam curing, wherein the steam curing time is 5 hours, the steam curing temperature is 160 ℃, and the pressure in the steam curing kettle is 0.8-1.2MPa, so that the fly ash autoclaved aerated concrete block is obtained after steam curing.
Example 2: the fly ash autoclaved aerated concrete block comprises the following raw materials in percentage by mass: water 1: 0.55. The components in the material are shown in table 1. Wherein the additive comprises 80kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer and 20kg of calcium stearoyl lactylate.
The preparation method of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer comprises the following steps: according to the weight portion, 195 parts of butyl acrylate and 195 parts of vinyl acetate are mixed to obtain a reagent A; mixing 20 parts of 2-acrylamido-2-methylpropanesulfonic acid with 15 parts of water to obtain a reagent B; dissolving 3 parts of potassium persulfate in 10 parts of water to obtain a reagent C; taking 6 parts of ethoxylated nonylphenol sulfosuccinate disodium salt, 2 parts of sodium stearyl lactate and 4 parts of sodium dodecyl sulfate, and mixing to obtain a reagent D; mixing 0.01 part of methylene bisacrylamide with 2 parts of water to obtain a reagent E; mixing two thirds of the reagent A and two thirds of the reagent B, adding the reagent D and the reagent E, emulsifying for 15min by using a high-speed shearing emulsifier, transferring the obtained emulsion into a three-neck flask, carrying out water bath at 80 ℃, adding the two thirds of the reagent C, reacting for 30min, then adding the remaining one third of the reagent A and one third of the reagent B, adding one third of the reagent C, carrying out heat preservation for 70min, discharging to obtain emulsion, and adding ammonia water until the emulsion is alkaline to obtain the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer.
The production method of the fly ash autoclaved aerated concrete block comprises the following steps of firstly, screening fly ash, finely grinding the fly ash, screening by using a screen, and weighing the fly ash with the formula amount; step two, pulping, namely uniformly mixing the fly ash and water with the formula amount of 99% to obtain slurry; step three, proportioning, namely weighing lime, gypsum, cement and an additive, and adding the weighed lime, gypsum, cement and additive into the slurry; weighing aluminum powder and water with the formula amount of 1%, uniformly mixing to obtain a mixed solution, adding the mixed solution into the slurry, and uniformly stirring to obtain a mixture; step four, molding, namely injecting the mixture into a mold; standing, namely standing the mixture in a mold for 90min, and taking out the mixture from the mold to obtain a semi-finished product; step six, cutting, namely cutting the taken semi-finished product; and seventhly, steam curing, namely placing the cut semi-finished product into a steam curing kettle for steam curing, wherein the steam curing time is 10 hours, the steam curing temperature is 180 ℃, and the pressure in the steam curing kettle is 0.8-1.2MPa, so that the fly ash autoclaved aerated concrete block is obtained after steam curing.
Example 3: the fly ash autoclaved aerated concrete block is different from the block in the embodiment 1 in that the block comprises the following materials in percentage by mass: water 1:0.6, and the ingredients in the feed are shown in table 1. Wherein the additive comprises 150kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer and 30kg of calcium stearoyl lactylate.
Example 4: the fly ash autoclaved aerated concrete block is different from the block in the embodiment 1 in that the components in the material are shown in the table 1. Wherein the additive comprises 100kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methyl propane sulfonic acid terpolymer, 20kg of calcium stearoyl lactylate and 20kg of sorbitan monostearate.
Example 5: the fly ash autoclaved aerated concrete block is different from the block in the embodiment 4 in that the components in the material are shown in the table 1.
Example 6: the fly ash autoclaved aerated concrete block is different from the block in the embodiment 4 in that the components in the material are shown in the table 1.
Example 7: the difference between the waste coal ash autoclaved aerated concrete block and the embodiment 1 is that the components in the material are shown in Table 1, and the additive comprises 100kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer, 20kg of calcium stearoyl lactylate and 20kg of manganese oxide.
Example 8: the difference between the fly ash autoclaved aerated concrete block and the block in the embodiment 1 is that the components in the material are shown in table 1, and the additive comprises 62.5kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer, 12.5kg of calcium stearoyl lactylate, 12.5kg of sorbitan monostearate and 12.5kg of manganese oxide.
Example 9: the difference between the fly ash autoclaved aerated concrete block and the embodiment 8 is that each component in the material comprises fly ash, lime, gypsum, cement, aluminum powder and an additive shown in the table 1, and further comprises 30 parts of bentonite. In the production method of the fly ash autoclaved aerated concrete block, step three, proportioning, weighing lime, gypsum, cement, an additive and bentonite, and adding into the slurry; weighing aluminum powder and 3% of water according to the formula amount, uniformly mixing to obtain a mixed solution, adding the mixed solution into the slurry, and uniformly stirring to obtain a mixture;
example 10: the fly ash autoclaved aerated concrete block is different from the block in the embodiment 9 in that the material comprises 40 parts of bentonite, and the additive comprises 120kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer, 20kg of calcium stearoyl lactylate, 20kg of sorbitan monostearate and 20kg of manganese oxide.
Comparative example 1: the fly ash autoclaved aerated concrete block is different from the block in the embodiment 1 in that the components in the material are shown in the table 1.
Comparative example 2: the difference of the fly ash autoclaved aerated concrete block from the embodiment 1 is that the components in the material are shown in table 1, and the additive is calcium stearoyl lactylate.
Comparative example 3: the difference of the fly ash autoclaved aerated concrete block from the embodiment 1 is that the components in the material are shown in table 1, and the additive is butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer.
Comparative example 4: the difference of the fly ash autoclaved aerated concrete block from the embodiment 1 is that the components in the material are shown in table 1, and the additive comprises 30kg of butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer and 20kg of calcium stearoyl lactylate.
Table 1 materials with components and contents
Determination of drying shrinkage value: the fly ash autoclaved aerated concrete blocks in examples 1-10 and comparative examples 1-4 are taken, the drying shrinkage value is determined by a standard method according to the GB11968-2006 autoclaved aerated concrete block standard, and the determination results are shown in Table 2.
And (3) measuring the deformation of the fly ash autoclaved aerated concrete blocks after the wall body is built, taking the fly ash autoclaved aerated concrete blocks with the age of more than 28 days of the embodiments 1, 4, 8, 9 and 1-4, respectively building the blocks into the wall body for 30 days, and plastering the blocks by using common mortar to obtain a plastering wall, wherein the width of the plastering wall is 245cm, and the height of the plastering wall is 190 cm. The deformation of the plastering wall body was measured by using two dial gauges for each wall in a cycle of 60 days, and the measurement results are shown in table 3.
TABLE 2 drying shrinkage values of the blocks of examples 1-10 and comparative examples 1-4
TABLE 3 masonry wall deformation measurement of example 1, example 4, example 8, example 9, and comparative examples 1 to 4
The determination results in table 2 show that the butyl acrylate/vinyl acetate/2-acrylamido-2-methylpropanesulfonic acid terpolymer and the calcium stearoyl lactylate are dispersed in the fly ash autoclaved aerated concrete, so that the drying shrinkage value of the fly ash autoclaved aerated concrete block can be effectively reduced. After the manganese oxide and the bentonite are added, the drying shrinkage value of the fly ash autoclaved aerated concrete block can be further reduced, and the sorbitan monostearate has little influence on the drying shrinkage value of the fly ash autoclaved aerated concrete block. The determination results in table 3 show that the butyl acrylate/vinyl acetate/2-acrylamido-2-methylpropanesulfonic acid terpolymer and the calcium stearoyl lactylate can effectively reduce the cumulative shrinkage and the linear shrinkage of the wall body constructed by the fly ash autoclaved aerated concrete block, and the addition of the manganese oxide and the bentonite can further reduce the cumulative shrinkage and the linear shrinkage of the wall body. After the sorbitan fatty acid ester is added, the cumulative shrinkage and linear shrinkage of the wall can be reduced, and the hydrophobicity of the pores of the building block can be enhanced, so that the moisture in the environment can be properly inhibited from entering the interior of the building block.
Claims (9)
1. A fly ash autoclaved aerated concrete block is characterized in that: the raw materials comprise materials and water, and the mass ratio of the materials is as follows: water 1: 0.55-0.6; the material comprises the following components in parts by weight,
the additive comprises butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer and calcium stearoyl lactate, and the mass ratio of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer is as follows: 4-6:1 of stearoyl calcium lactate; the preparation method of the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer comprises the following steps of mixing, by weight, 180-195 parts of butyl acrylate and 180-195 parts of vinyl acetate to obtain a reagent A; mixing 15-20 parts of 2-acrylamide-2-methylpropanesulfonic acid with 15 parts of water to obtain a reagent B; dissolving 2-3 parts of potassium persulfate in 10 parts of water to obtain a reagent C; taking 4-6 parts of ethoxylated nonylphenol sulfosuccinate disodium salt, 1-2 parts of sodium stearyl lactate and 3-4 parts of sodium dodecyl sulfate, and mixing to obtain a reagent D; mixing 0.01 part of methylene bisacrylamide with 2 parts of water to obtain a reagent E; mixing two thirds of the reagent A and two thirds of the reagent B, adding the reagent D and the reagent E, emulsifying for 15min by using a high-speed shearing emulsifier, transferring the obtained emulsion into a three-neck flask, carrying out water bath at 80 ℃, adding the two thirds of the reagent C, reacting for 10-30min, then adding the remaining one third of the reagent A and one third of the reagent B, then adding one third of the reagent C, carrying out heat preservation for 50-70min, discharging to obtain emulsion, and adding ammonia water until the emulsion is alkaline to obtain the butyl acrylate/vinyl acetate/2-acrylamide-2-methylpropanesulfonic acid terpolymer.
2. The fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: materials: water 1: 0.56.
3. the fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: the materials comprise 3300 parts of fly ash, 380 parts of lime and 300 parts of cement in parts by weight.
4. The fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: the material comprises 2.2 parts of aluminum powder by weight.
5. The fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: butyl acrylate/vinyl acetate/2-acrylamido-2-methylpropanesulfonic acid terpolymer in mass ratio: and 5:1 of stearoyl calcium lactate.
6. The fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: the additive also comprises sorbitan monostearate, and the mass ratio of the sorbitan monostearate: 1:1 of stearoyl calcium lactate.
7. The fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: the additive also comprises manganese oxide, wherein the mass ratio of manganese oxide: and (3) 1: 2 of stearoyl calcium lactate.
8. The fly ash autoclaved aerated concrete block according to claim 1, which is characterized in that: the material also comprises 30-40 parts of bentonite.
9. A method for producing the fly ash autoclaved aerated concrete block according to any one of claims 1 to 8, which is characterized in that: comprises the following steps of (a) carrying out,
screening fly ash, grinding the fly ash, screening the fly ash by using a screen, and weighing the fly ash according to the formula amount;
step two, pulping, namely uniformly mixing the fly ash and water with the formula amount of 97-99% to obtain slurry;
step three, proportioning, namely weighing lime, gypsum, cement and an additive, and adding the weighed lime, gypsum, cement and additive into the slurry; weighing aluminum powder and water with the formula amount of 1-3%, uniformly mixing to obtain a mixed solution, adding the mixed solution into the slurry, and uniformly stirring to obtain a mixture;
step four, molding, namely injecting the mixture into a mold;
standing, namely standing the mixture in a mold for 90min, and taking out the mixture from the mold to obtain a semi-finished product;
step six, cutting, namely cutting the taken semi-finished product; and seventhly, steam curing, namely placing the cut semi-finished product into a steam curing kettle for steam curing, wherein the steam curing time is 5-10 hours, the steam curing temperature is 160-180 ℃, and the pressure in the steam curing kettle is 0.8-1.2MPa, so that the fly ash autoclaved aerated concrete block is obtained after steam curing.
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| CN112209691A (en) * | 2020-09-04 | 2021-01-12 | 苏州良浦天路新型建材有限公司 | Ash aerated block and preparation method thereof |
| CN113045280A (en) * | 2021-03-02 | 2021-06-29 | 东莞市保源建材有限公司 | Autoclaved aerated concrete block and preparation process thereof |
| CN113735613A (en) * | 2021-07-14 | 2021-12-03 | 襄阳华壁新型建材有限公司 | Autoclaved aerated concrete block and preparation method thereof |
| CN115784697B (en) * | 2022-11-29 | 2024-02-23 | 广州市贤达建材有限公司 | Self-heat-preservation autoclaved aerated block and preparation process thereof |
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Denomination of invention: A fly ash autoclaved aerated concrete block and its production method Effective date of registration: 20221205 Granted publication date: 20210330 Pledgee: Bank of China Limited Xiangyang Branch Pledgor: XIANGYANG HUA WALL NEW BUILDING MATERIALS CO.,LTD. Registration number: Y2022980025116 |