CN112239370A - High-strength aerated concrete block and preparation method thereof - Google Patents
High-strength aerated concrete block and preparation method thereof Download PDFInfo
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- CN112239370A CN112239370A CN202011020198.1A CN202011020198A CN112239370A CN 112239370 A CN112239370 A CN 112239370A CN 202011020198 A CN202011020198 A CN 202011020198A CN 112239370 A CN112239370 A CN 112239370A
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- 239000004567 concrete Substances 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 60
- 238000003756 stirring Methods 0.000 claims abstract description 35
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 32
- 239000012745 toughening agent Substances 0.000 claims abstract description 27
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000227 grinding Methods 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 239000002699 waste material Substances 0.000 claims abstract description 21
- 238000010276 construction Methods 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 14
- 239000004576 sand Substances 0.000 claims abstract description 14
- 239000001856 Ethyl cellulose Substances 0.000 claims abstract description 13
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 13
- 229920001249 ethyl cellulose Polymers 0.000 claims abstract description 13
- 235000019325 ethyl cellulose Nutrition 0.000 claims abstract description 13
- 235000019362 perlite Nutrition 0.000 claims abstract description 13
- 239000010451 perlite Substances 0.000 claims abstract description 13
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 12
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 239000004571 lime Substances 0.000 claims abstract description 12
- 238000000498 ball milling Methods 0.000 claims abstract description 11
- 238000001694 spray drying Methods 0.000 claims abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007864 aqueous solution Substances 0.000 claims abstract description 10
- 239000011268 mixed slurry Substances 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 239000002245 particle Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 239000002253 acid Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0259—Hardening promoted by a rise in pressure
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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
-
- 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 high-strength aerated concrete block. The invention discloses a preparation method of the high-strength aerated concrete block, which comprises the following steps: adding silicon carbide fibers into a sulfuric acid solution for soaking, filtering, washing, and adding into a polyvinyl alcohol aqueous solution to obtain pretreated silicon carbide fibers; feeding yttrium oxide powder, ethyl cellulose and 3-aminopropyltriethoxysilane into water, grinding, adding into pretreated silicon carbide fiber, ultrasonically dispersing at 50-70 deg.C for 1-2h, and spray drying to obtain fiber toughening agent; mixing cement, fly ash, vitrified micro bubbles, expanded perlite, sand and a water reducing agent, ball-milling, adding the construction waste, a fiber toughening agent and water under a stirring state, and uniformly mixing to obtain a premix; adding lime powder into the premix, quickly stirring, then adding aluminum powder paste, continuously stirring, quickly pouring the mixed slurry into a building block mold, standing for 2-4h at 40-46 ℃, and carrying out autoclaved curing to obtain the high-strength aerated concrete building block.
Description
Technical Field
The invention relates to the technical field of aerated concrete blocks, in particular to a high-strength aerated concrete block and a preparation method thereof.
Background
With the rapid development of social economy, the consumption and consumption speed of energy are gradually increased, and the energy problem and the environmental problem are increasingly highlighted, which become important tests for human beings in the 21 st century. It is reported that by 2020, urban and rural house buildings in China will increase the building area by about 300 hundred million m2And the building energy consumption accounts for 30 percent of the total energy consumption of China.
The aerated concrete block is a novel light energy-saving wall material with uniform air holes, smooth surface, regular edges and corners and simple and convenient construction, has the characteristics of light weight, heat preservation, heat insulation, non-combustion and the like, is a product prepared by taking cement, fly ash and the like as raw materials through the processes of proportioning, stirring, gas generation, cutting, maintenance and the like, can be used for replacing the traditional clay brick, is used for building walls, and is a good building material with the functions of energy conservation and heat preservation.
Along with the demolition of old buildings in cities or the increase of natural disasters, the quantity of construction wastes is more and more, and the simple landfill is actually a great waste of the waste resources. At present, the disposal of construction waste advocates the efficient utilization of resources. With the rapid improvement of national economic level, the building industry has higher and higher requirements on the performance of each aspect of building materials. If the construction waste is used for concrete blocks, micro cracks are easily generated in the concrete, so that water or other soluble substances are easy to permeate and the damage process is accelerated.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a high-strength aerated concrete block and a preparation method thereof.
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, adding the silicon carbide fiber into a sulfuric acid solution, soaking for 1-2h, filtering, washing, and adding into a polyvinyl alcohol aqueous solution to obtain pretreated silicon carbide fiber;
s2, feeding yttrium oxide powder with the particle size of 1-2 mu m, ethyl cellulose and 3-aminopropyltriethoxysilane into water, grinding for 20-40min at 72-80 ℃, grinding at 10000-12000r/min and grinding pressure of 1.2-1.6MPa, adding the mixture into pretreated silicon carbide fiber, ultrasonically dispersing for 1-2h at 50-70 ℃, and spray drying to obtain a fiber toughening agent;
s3, mixing cement, fly ash, vitrified micro bubbles, expanded perlite, sand and a water reducing agent, ball-milling, adding the construction waste, the fiber toughening agent and water under a stirring state, and uniformly mixing to obtain a premix;
and S4, adding lime powder into the premix, quickly stirring for 1-3min, then adding aluminum powder paste, continuously stirring for 20-40S, quickly pouring the mixed slurry into a building block mold, standing for 2-4h at 40-46 ℃, and performing autoclaved curing to obtain the high-strength aerated concrete building block.
Preferably, in S1, the mass ratio of the silicon carbide fiber to the sulfuric acid solution to the polyvinyl alcohol aqueous solution is 10-16: 50-80: 60-100 percent of sulfuric acid solution, 80-88 percent of polyvinyl alcohol solution and 2-6 percent of polyvinyl alcohol solution.
Preferably, in S1, the fineness of the silicon carbide fiber is 6-10 μm, the length-diameter ratio L/D is 10: 1-2.
Preferably, in S2, the mass ratio of the yttrium oxide powder with the particle size of 1-2 μm, the ethyl cellulose, the 3-aminopropyl triethoxysilane and the pretreated silicon carbide fiber is 1-4: 1-2: 0.1-0.12: 15-19.
Preferably, in the spray drying process of S2, the inlet air temperature is 160-180 ℃, and the spray pressure is 0.14-0.16 MPa.
Preferably, in S3, the mass ratio of cement, fly ash, vitrified micro bubbles, expanded perlite, sand, water reducing agent, construction waste and fiber toughening agent is 30-50: 15-35: 4-12: 2-6: 5-15: 1-3: 65-85: 2-10.
Preferably, in S3, the ball is milled until the specific surface area is more than or equal to 620m2/kg。
Preferably, in S4, the mass ratio of the premix to the lime powder is 80-100: 2-4.
Preferably, the curing operation of S4 is as follows: firstly increasing the pressure to 1-1.2MPa, curing at 80-90 ℃ for 4-6h, continuously increasing the pressure to 1.6-1.8MPa, curing at 140 ℃ for 1-2h, then reducing the pressure to 1.1-1.3MPa, and curing at 40-50 ℃ for 10-16 h.
A high-strength aerated concrete block is prepared by the preparation method of the high-strength aerated concrete block.
Preferably, the volume weight of the high-strength aerated concrete block is 486-3The compressive strength is 4.5-7.3 MPa.
The technical effects of the invention are as follows:
according to the invention, the fiber toughening agent is used for manufacturing the concrete block, so that the structure of the construction waste is stabilized, the production cost is reduced, the resource utilization rate is improved, and the toughened concrete block with low possibility of cracking is prepared.
In S1, after the silicon carbide fiber is properly treated by sulfuric acid, a defect structure is formed on the surface; in S2, yttrium oxide powder and ethyl cellulose are compounded, ethyl cellulose is grafted on the surface of yttrium oxide powder through high-speed grinding under the coordination of 3-aminopropyltriethoxysilane, the yttrium oxide powder can be effectively embedded on the surface of silicon carbide fiber with surface defects after ultrasonic treatment, the bonding strength is extremely high, a cellulose structure is grafted on the surface, the obtained fiber toughening agent can be fully dispersed in construction waste, the bonding strength between the fiber toughening agent and fly ash, vitrified micro-beads and sand is high, and the structure formed after solidification can effectively inhibit the concrete from generating micro cracks; meanwhile, the special cellulose grafting structure of the fiber toughening agent further enhances the fracture toughness of the concrete, and the mechanical property of the concrete block is extremely excellent; in the process of gas generation, the fiber toughening agent is compounded with the fly ash, the vitrified micro bubbles, the expanded perlite and the sand, autoclaved curing is carried out after foaming, a large number of micro closed cell structures are formed inside by utilizing rapid volatilization and expansion of water and matching with the surface tension of the fiber toughening agent under certain pressure and temperature after curing, and the characteristics of light weight and low heat conductivity coefficient are endowed on the premise of ensuring the toughness of concrete.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, mixing 10kg of the powder with fineness of 6-10 mu m and length-diameter ratio L/D of 10: 2, soaking the silicon carbide fiber in 50kg of 88% sulfuric acid solution, filtering, washing, adding 100kg of 2% polyvinyl alcohol aqueous solution, and stirring at the speed of 1000r/min for 10min to obtain pretreated silicon carbide fiber;
s2, feeding 4kg of yttrium oxide powder with the particle size of 1-2 microns, 2kg of ethyl cellulose and 0.1kg of 3-aminopropyltriethoxysilane into 6kg of water, grinding for 40min at 72 ℃, wherein the grinding speed is 10000r/min and the grinding pressure is 1.6MPa, adding the mixture into 15kg of pretreated silicon carbide fiber, ultrasonically dispersing for 1h at 70 ℃, and performing spray drying, wherein the air inlet temperature is 180 ℃, and the spray pressure is 0.14MPa to obtain a fiber toughening agent;
s3, mixing 50kg of cement, 15kg of fly ash, 12kg of vitrified micro bubbles, 2kg of expanded perlite, 15kg of sand and 1kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2Adding 85kg of construction waste, 2kg of fiber toughening agent and 45kg of water under stirring, and uniformly mixing to obtain a premix;
s4, adding 4kg of lime powder into 80kg of premix, quickly stirring for 1min, then adding 2kg of aluminum paste, continuously stirring for 20S, quickly pouring the mixed slurry into a building block mold, and standing for 2h at 46 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1.2MPa, curing for 6h at 80 ℃, continuously increasing the pressure to 1.6MPa, curing for 1h at 160 ℃, then reducing the pressure to 1.3MPa, and curing for 16h at 40 ℃ to obtain the high-strength aerated concrete block.
Example 2
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, mixing 16kg of the powder with fineness of 6-10 mu m and length-diameter ratio L/D of 10: 1, adding the silicon carbide fiber into 80kg of a sulfuric acid solution with the mass fraction of 80%, soaking for 2 hours, filtering, washing, adding 60kg of a polyvinyl alcohol aqueous solution with the mass fraction of 6%, and stirring at the speed of 600r/min for 15 minutes to obtain a pretreated silicon carbide fiber;
s2, feeding 1kg of yttrium oxide powder with the particle size of 1-2 microns, 1kg of ethyl cellulose and 0.12kg of 3-aminopropyltriethoxysilane into 4kg of water, grinding for 20min at 80 ℃, grinding at the speed of 12000r/min and under the grinding pressure of 1.2MPa, adding the mixture into 19kg of pretreated silicon carbide fiber, ultrasonically dispersing for 2h at 50 ℃, and performing spray drying at the air inlet temperature of 160 ℃ and under the spray pressure of 0.16MPa to obtain a fiber toughening agent;
s3, mixing 30kg of cement, 35kg of fly ash, 4kg of vitrified micro bubbles, 6kg of expanded perlite, 5kg of sand and 3kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2Adding 65kg of construction waste, 10kg of fiber toughening agent and 35kg of water under stirring, and uniformly mixing to obtain a premix;
s4, adding 2kg of lime powder into 100kg of premix, quickly stirring for 3min, then adding 1kg of aluminum paste, continuously stirring for 40S, quickly pouring the mixed slurry into a building block mold, and standing for 4h at 40 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1MPa, curing for 4h at 90 ℃, continuously increasing the pressure to 1.8MPa, curing for 2h at 140 ℃, then reducing the pressure to 1.1MPa, and curing for 10h at 50 ℃ to obtain the high-strength aerated concrete block.
Example 3
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, mixing 12kg of the powder with fineness of 7-9 μm and length-diameter ratio L/D of 10: 1.7, adding the silicon carbide fiber into 60kg of 86% sulfuric acid solution, soaking for 1.3h, filtering, washing, adding into 90kg of 3% polyvinyl alcohol aqueous solution, and stirring at the speed of 900r/min for 11min to obtain pretreated silicon carbide fiber;
s2, feeding 3kg of yttrium oxide powder with the particle size of 1-2 microns, 1.3kg of ethyl cellulose and 0.115kg of 3-aminopropyltriethoxysilane into 4.5kg of water, grinding at 78 ℃ for 25min at the grinding speed of 11500r/min and the grinding pressure of 1.3MPa, adding the mixture into 18kg of pretreated silicon carbide fiber, ultrasonically dispersing at 55 ℃ for 1.7h, and carrying out spray drying at the air inlet temperature of 165 ℃ and the spray pressure of 0.155MPa to obtain a fiber toughening agent;
S3mixing 35kg of cement, 30kg of fly ash, 6kg of vitrified micro bubbles, 5kg of expanded perlite, 8kg of sand and 2.5kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2Adding 70kg of construction waste, 8kg of fiber toughening agent and 38kg of water under stirring, and uniformly mixing to obtain a premix;
s4, adding 2.5kg of lime powder into 95kg of premix, quickly stirring for 2.5min, then adding 1.3kg of aluminum paste, continuously stirring for 35S, quickly pouring the mixed slurry into a building block mold, and standing for 3.5h at 42 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1.05MPa, curing for 4.5h at 88 ℃, continuing increasing the pressure to 1.75MPa, curing for 1.7h at 145 ℃, then reducing the pressure to 1.15MPa, and curing for 12h at 47 ℃ to obtain the high-strength aerated concrete block.
Example 4
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, mixing 14kg of the powder with fineness of 7-9 μm and length-diameter ratio L/D of 10: 1.3, adding the silicon carbide fiber into 70kg of sulfuric acid solution with the mass fraction of 82%, soaking for 1.7h, filtering, washing, adding into 70kg of polyvinyl alcohol aqueous solution with the mass fraction of 5%, and stirring at the speed of 700r/min for 13min to obtain pretreated silicon carbide fiber;
s2, feeding 2kg of yttrium oxide powder with the particle size of 1-2 microns, 1.7kg of ethyl cellulose and 0.105kg of 3-aminopropyltriethoxysilane into 5.5kg of water, grinding at 74 ℃ for 35min at the grinding speed of 10500r/min and the grinding pressure of 1.5MPa, adding the mixture into 16kg of pretreated silicon carbide fiber, ultrasonically dispersing for 1.3h at 65 ℃, and carrying out spray drying at the air inlet temperature of 175 ℃ and the spray pressure of 0.145MPa to obtain a fiber toughening agent;
s3, mixing 45kg of cement, 20kg of fly ash, 10kg of vitrified micro bubbles, 3kg of expanded perlite, 12kg of sand and 1.5kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2Adding 80kg of construction waste, 4kg of fiber toughening agent and 42kg of water under stirring, and uniformly mixing to obtain a premix;
s4, adding 3.5kg of lime powder into 85kg of premix, quickly stirring for 1.5min, then adding 1.7kg of aluminum paste, continuously stirring for 25S, quickly pouring the mixed slurry into a building block mold, and standing for 2.5h at 44 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1.15MPa, curing for 5.5h at 82 ℃, continuing increasing the pressure to 1.65MPa, curing for 1.3h at 155 ℃, then reducing the pressure to 1.25MPa, and curing for 14h at 43 ℃ to obtain the high-strength aerated concrete block.
Example 5
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, mixing 13kg of the powder with fineness of 7-9 μm and length-diameter ratio L/D of 10: 1.5, adding the silicon carbide fiber into 65kg of 84% sulfuric acid solution by mass fraction, soaking for 1.5h, filtering, washing, adding into 80kg of 4% polyvinyl alcohol aqueous solution by mass fraction, and stirring at the speed of 800r/min for 12min to obtain pretreated silicon carbide fiber;
s2, feeding 2.5kg of yttrium oxide powder with the particle size of 1-2 microns, 1.5kg of ethyl cellulose and 0.11kg of 3-aminopropyltriethoxysilane into 5kg of water, grinding at 76 ℃ for 30min at the grinding speed of 11000r/min and the grinding pressure of 1.4MPa, adding the mixture into 17kg of pretreated silicon carbide fiber, ultrasonically dispersing for 1.5h at 60 ℃, and carrying out spray drying at the air inlet temperature of 170 ℃ and the spray pressure of 0.15MPa to obtain a fiber toughening agent;
s3, mixing 40kg of cement, 25kg of fly ash, 8kg of vitrified micro bubbles, 4kg of expanded perlite, 10kg of sand and 2kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2Adding 75kg of construction waste, 6kg of fiber toughening agent and 40kg of water under stirring, and uniformly mixing to obtain a premix;
s4, adding 3kg of lime powder into 90kg of premix, quickly stirring for 2min, then adding 1.5kg of aluminum paste, continuously stirring for 30S, quickly pouring the mixed slurry into a building block mold, and standing for 3h at 43 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1.1MPa, curing for 5h at 85 ℃, continuously increasing the pressure to 1.7MPa, curing for 1.5h at 150 ℃, then reducing the pressure to 1.2MPa, and curing for 13h at 45 ℃ to obtain the high-strength aerated concrete block.
Comparative example 1
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, 2.5kg of yttrium oxide powder with the particle size of 1-2 microns, 1.5kg of ethyl cellulose and 0.11kg of 3-aminopropyltriethoxysilane are put into 5kg of water, ground at 76 ℃ for 30min at the grinding speed of 11000r/min and the grinding pressure of 1.4MPa, and added until 17kg of the yttrium oxide powder with the particle size of 7-9 microns and the length-diameter ratio L/D of 10: 1.5, ultrasonically dispersing for 1.5h at 60 ℃, and spray-drying at the air inlet temperature of 170 ℃ under the spray pressure of 0.15MPa to obtain a fiber toughening agent;
s2, mixing 40kg of cement, 25kg of fly ash, 8kg of vitrified micro bubbles, 4kg of expanded perlite, 10kg of sand and 2kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2Adding 75kg of construction waste, 6kg of fiber toughening agent and 40kg of water under stirring, and uniformly mixing to obtain a premix;
s3, adding 3kg of lime powder into 90kg of premix, quickly stirring for 2min, then adding 1.5kg of aluminum paste, continuously stirring for 30S, quickly pouring the mixed slurry into a building block mold, and standing for 3h at 43 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1.1MPa, curing for 5h at 85 ℃, continuously increasing the pressure to 1.7MPa, curing for 1.5h at 150 ℃, then reducing the pressure to 1.2MPa, and curing for 13h at 45 ℃ to obtain the high-strength aerated concrete block.
Comparative example 2
A preparation method of a high-strength aerated concrete block comprises the following steps:
s1, mixing 40kg of cement, 25kg of fly ash, 8kg of vitrified micro bubbles, 4kg of expanded perlite, 10kg of sand and 2kg of polycarboxylic acid water reducing agent, and ball-milling until the specific surface area is more than or equal to 620m2And/kg, adding 75kg of construction waste, 6kg of construction waste with fineness of 7-9 μm and length-diameter ratio L/D of 10: 1.5, uniformly mixing the silicon carbide fiber and 40kg of water to obtain a premix;
s2, adding 3kg of lime powder into 90kg of premix, quickly stirring for 2min, then adding 1.5kg of aluminum paste, continuously stirring for 30S, quickly pouring the mixed slurry into a building block mold, and standing for 3h at 43 ℃;
and then, carrying out autoclaved curing, namely firstly increasing the pressure to 1.1MPa, curing for 5h at 85 ℃, continuously increasing the pressure to 1.7MPa, curing for 1.5h at 150 ℃, then reducing the pressure to 1.2MPa, and curing for 13h at 45 ℃ to obtain the high-strength aerated concrete block.
According to the standard of autoclaved aerated concrete blocks (GB 11968-:
therefore, the concrete block manufactured by using the fiber toughening agent not only stabilizes the structure of construction waste, reduces the production cost, but also improves the resource utilization rate, and the prepared concrete block with light weight, low heat conductivity coefficient and difficult occurrence of cracks is obtained.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A preparation method of a high-strength aerated concrete block is characterized by comprising the following steps:
s1, adding the silicon carbide fiber into a sulfuric acid solution, soaking for 1-2h, filtering, washing, and adding into a polyvinyl alcohol aqueous solution to obtain pretreated silicon carbide fiber;
s2, feeding yttrium oxide powder with the particle size of 1-2 mu m, ethyl cellulose and 3-aminopropyltriethoxysilane into water, grinding for 20-40min at 72-80 ℃, grinding at 10000-12000r/min and grinding pressure of 1.2-1.6MPa, adding the mixture into pretreated silicon carbide fiber, ultrasonically dispersing for 1-2h at 50-70 ℃, and spray drying to obtain a fiber toughening agent;
s3, mixing cement, fly ash, vitrified micro bubbles, expanded perlite, sand and a water reducing agent, ball-milling, adding the construction waste, the fiber toughening agent and water under a stirring state, and uniformly mixing to obtain a premix;
and S4, adding lime powder into the premix, quickly stirring for 1-3min, then adding aluminum powder paste, continuously stirring for 20-40S, quickly pouring the mixed slurry into a building block mold, standing for 2-4h at 40-46 ℃, and performing autoclaved curing to obtain the high-strength aerated concrete building block.
2. The method for preparing the high-strength aerated concrete block according to claim 1, wherein in S1, the mass ratio of the silicon carbide fiber to the sulfuric acid solution to the polyvinyl alcohol aqueous solution is 10-16: 50-80: 60-100 percent of sulfuric acid solution, 80-88 percent of polyvinyl alcohol solution and 2-6 percent of polyvinyl alcohol solution.
3. The preparation method of the high-strength aerated concrete block according to claim 1, wherein in S1, the fineness of the silicon carbide fiber is 6-10 μm, the length-diameter ratio L/D is 10: 1-2.
4. The method for preparing the high-strength aerated concrete block according to claim 1, wherein in the step S2, the mass ratio of yttrium oxide powder with the particle size of 1-2 μm, ethyl cellulose, 3-aminopropyltriethoxysilane and pretreated silicon carbide fiber is 1-4: 1-2: 0.1-0.12: 15-19.
5. The preparation method of the high-strength aerated concrete block according to claim 1, wherein in the spray drying process of S2, the air inlet temperature is 160-180 ℃, and the spray pressure is 0.14-0.16 MPa.
6. The preparation method of the high-strength aerated concrete block according to claim 1, wherein in S3, the mass ratio of cement, fly ash, vitrified micro bubbles, expanded perlite, sand, water reducing agent, construction waste and fiber toughening agent is 30-50: 15-35: 4-12: 2-6: 5-15: 1-3: 65-85: 2-10.
7. The high strength steel of claim 1The preparation method of the gas concrete building block is characterized in that in S3, the ball milling is carried out until the specific surface area is more than or equal to 620m2/kg。
8. The preparation method of the high-strength aerated concrete block according to claim 1, wherein in S4, the mass ratio of the premix to the lime powder is 80-100: 2-4.
9. The preparation method of the high-strength aerated concrete block according to claim 1, wherein the concrete curing operation of S4 is as follows: firstly increasing the pressure to 1-1.2MPa, curing at 80-90 ℃ for 4-6h, continuously increasing the pressure to 1.6-1.8MPa, curing at 140 ℃ for 1-2h, then reducing the pressure to 1.1-1.3MPa, and curing at 40-50 ℃ for 10-16 h.
10. A high-strength aerated concrete block, characterized in that it is produced by the method of any one of claims 1 to 9.
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