CN114956758A - Brick residue-containing aerated brick and preparation method thereof - Google Patents
Brick residue-containing aerated brick and preparation method thereof Download PDFInfo
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- CN114956758A CN114956758A CN202210608444.8A CN202210608444A CN114956758A CN 114956758 A CN114956758 A CN 114956758A CN 202210608444 A CN202210608444 A CN 202210608444A CN 114956758 A CN114956758 A CN 114956758A
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- brick
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- crack
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- aerated
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- 239000011449 brick Substances 0.000 title claims abstract description 158
- 238000002360 preparation method Methods 0.000 title claims abstract description 60
- 239000000835 fiber Substances 0.000 claims abstract description 127
- 238000003756 stirring Methods 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 44
- 239000002893 slag Substances 0.000 claims abstract description 38
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 235000004431 Linum usitatissimum Nutrition 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 241000208202 Linaceae Species 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011268 mixed slurry Substances 0.000 claims abstract description 12
- 239000008247 solid mixture Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 239000006260 foam Substances 0.000 claims abstract description 8
- 239000004576 sand Substances 0.000 claims abstract description 8
- 239000003381 stabilizer Substances 0.000 claims abstract description 8
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 6
- 239000010440 gypsum Substances 0.000 claims abstract description 6
- 239000004571 lime Substances 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims description 52
- 230000002209 hydrophobic effect Effects 0.000 claims description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 15
- 239000005543 nano-size silicon particle Substances 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- 239000003607 modifier Substances 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 10
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 9
- 230000004048 modification Effects 0.000 claims description 9
- 238000012986 modification Methods 0.000 claims description 9
- -1 polyethylene Polymers 0.000 claims description 9
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 8
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 7
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004964 aerogel Substances 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical group CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 27
- 235000008733 Citrus aurantifolia Nutrition 0.000 abstract description 5
- 235000011941 Tilia x europaea Nutrition 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 13
- 239000011148 porous material Substances 0.000 description 6
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004965 Silica aerogel Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 235000013162 Cocos nucifera Nutrition 0.000 description 2
- 244000060011 Cocos nucifera Species 0.000 description 2
- 240000006240 Linum usitatissimum Species 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- SYELZBGXAIXKHU-UHFFFAOYSA-N dodecyldimethylamine N-oxide Chemical group CCCCCCCCCCCC[N+](C)(C)[O-] SYELZBGXAIXKHU-UHFFFAOYSA-N 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004575 stone Substances 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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/525—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing organic fibres, e.g. wood fibres
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
-
- 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
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant 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
- 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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Botany (AREA)
- Wood Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The application relates to the field of sole materials, and particularly discloses a brick residue-containing aerated brick and a preparation method thereof. The aerated brick containing brick slag comprises the following raw materials of sand, waste brick slag, lime, cement, gypsum, aluminum powder, a water reducing agent, a foam stabilizer, anti-cracking fiber and water; the anti-crack fiber is obtained by performing a heat treatment method on flax fiber; the preparation method comprises the following steps: adding aluminum powder into water while stirring to obtain aluminum powder liquid, mixing the rest raw materials to obtain a solid mixture, adding the aluminum powder liquid into the solid mixture while stirring, and continuously stirring for 5-8min to obtain mixed slurry; and pouring the mixed slurry into a mold for molding to obtain the aerated brick. The aerated brick containing the brick slag has the advantage of improving the crack resistance of the aerated brick.
Description
Technical Field
The application relates to the field of building materials, in particular to an aerated brick containing brick residues and a preparation method thereof.
Background
The aerated brick is also called aerated concrete block, is a novel wall material prepared by using stone powder, cement and other main raw materials, and is widely used for non-bearing wall masonry and frame structure filling. The raw material sources of the aerated bricks are wide, and the ash sand, the slag, the fly ash, the coal gangue and the like can be used as raw materials of the aerated bricks, have excellent heat insulation performance, and gradually become indispensable building materials in the building industry.
However, the crack resistance of the existing aerated bricks is still to be improved, and a product with higher crack resistance is needed to be provided.
Disclosure of Invention
In order to improve the crack resistance of the aerated brick, the application provides an aerated brick containing brick slag.
In a first aspect, the application provides a brick slag-containing aerated brick, which adopts the following technical scheme:
the aerated brick containing brick slag comprises the following raw materials in parts by weight:
2500 parts of 1900-one sand, 500 parts of 470-one waste brick slag, 200 parts of 180-one lime, 150 parts of 130-one cement, 30-50 parts of gypsum, 2.6-2.8 parts of aluminum powder, 1-1.5 parts of a water reducing agent, 1-1.5 parts of a foam stabilizer, 4-6 parts of anti-cracking fiber and 1650 parts of 1550-one water; the anti-crack fibers are obtained by performing a heat treatment method on flax fibers.
By adopting the technical scheme, the waste brick slag is added as a supporting framework instead of partial sand, so that waste brick slag can be changed into valuable, and the brick slag support is environment-friendly and economical; the processing performance of the aerated brick is improved by adding the water reducing agent and the foam stabilizer. The flax fibers have excellent tensile strength, the crack resistance of the aerated brick can be effectively improved, the crack resistance fibers are obtained by the flax fibers through a heat treatment method, and the heat treatment removes the binding water in the flax fibers, so that the possibility that the flax fibers generate cracks due to pores generated by heated dehydration in the processing process of the aerated brick is reduced, and the crack resistance of the aerated brick is further improved; and the surface roughness of the flax fibers after heat treatment is enhanced, so that the combination of the anti-crack fibers and the aggregate in the aerated brick is enhanced, the anti-crack fibers can stably exist in the aerated brick, and the anti-crack performance of the aerated brick is further improved.
Optionally, based on the weight of the anti-crack fiber, the anti-crack fiber is prepared by a method comprising the following steps: heating 20-30 parts of flax fibers to 215-235 ℃ under the protection of nitrogen, and continuously heating for 30-45min to obtain the anti-crack fibers.
By adopting the technical scheme, the flax fiber has excellent anti-cracking performance, but the flax fiber is used as a natural fiber and contains bound water which is difficult to remove, so that the flax fiber is easy to dehydrate after being heated to generate pores, and further the aerated brick added with the flax fiber generates pores, so that the anti-cracking performance of the aerated brick is influenced; and the anti-cracking fiber obtained after the heat treatment of the flax fiber can effectively remove the bound water in the fiber, so that the anti-cracking fiber cannot generate pores in the preparation process of the aerated brick, and the anti-cracking performance of the aerated brick is improved.
Optionally, the anti-crack fibers are modified anti-crack fibers, and the modified anti-crack fibers are obtained by performing surface hydrophobic modification on the anti-crack fibers.
By adopting the technical scheme, the modified anti-crack fibers obtained by hydrophobic modification of the anti-crack fibers can be well dispersed in the aerated brick, so that the anti-crack performance of the aerated brick is further improved.
Optionally, based on the weight of the modified anti-crack fiber, the modified anti-crack fiber is prepared by a method comprising the following steps:
adding 30-40 parts of polyethylene into 50-60 parts of trichloroethylene under stirring at 75-85 ℃, and continuously stirring for 20-30min to obtain a modifier; adding 10-20 parts of anti-crack fiber into the modifier while stirring to obtain a mixed solution, continuously heating the mixed solution at 90-95 ℃ for 40-50min, and filtering to obtain the modified anti-crack fiber.
By adopting the technical scheme, the polyethylene can be dissolved in trichloroethylene in a small amount at the temperature of more than 70 ℃, and the trichloroethylene can be volatilized as a solvent under the heating condition of 90-95 ℃, so that the polypropylene can be coated on the surface of the anti-crack fiber, and the surface performance of the anti-crack fiber is improved.
Optionally, the aerated brick raw material further comprises 1-3 parts of nano filler.
By adopting the technical scheme, the nano filler can fill gaps among various particles in the aerated brick, so that the strength of the aerated brick is improved, and the possibility of cracks of the aerated brick caused by external force is reduced.
Optionally, based on the weight of the nano filler, the nano filler comprises the following raw materials in percentage by weight: 80-85% of nano silicon nitride, and the balance of nano silicon dioxide aerogel.
By adopting the technical scheme, the nano silicon nitride has high hardness and excellent wear resistance, can not be cracked even if rapidly cooled and rapidly heated, and the nano silicon dioxide aerogel is light in weight but high in hardness; the nano silicon nitride and the nano silicon dioxide aerogel are matched, so that the strength of the aerated brick can be effectively improved, and the possibility of cracks of the aerated brick caused by external force is reduced.
Optionally, the nano filler is a hydrophobic modified nano filler, and the hydrophobic nano filler is obtained by performing hydrophobic modification on the nano filler through a silane coupling agent.
By adopting the technical scheme, the hydrophobic modified nano filler obtained by modifying the nano filler by the silane coupling agent can be more fully dispersed in the aerated brick, so that the strength of the aerated brick is further improved, and the possibility of cracks of the aerated brick caused by external force is reduced.
Optionally, based on the weight of the modified nanofiller, the hydrophobic nanofiller is prepared by a method comprising the steps of: adding 10-15 parts of nano filler into 30-50 parts of acetone while stirring to obtain a suspension, adding 15-25 parts of silane coupling agent into the suspension while stirring to obtain a base solution, continuously stirring the base solution at 85-95 ℃ for 40-50min, and filtering to obtain hydrophobic nano filler; the silane coupling agent is vinyl triethoxysilane.
By adopting the technical scheme, the silane coupling agent can perform hydrophobic modification on the surface of the nano filler under the action of acetone.
In a second aspect, the application provides a preparation method of an aerated brick containing brick slag, which adopts the following technical scheme: a preparation method of an aerated brick containing brick slag comprises the following steps:
adding aluminum powder into water while stirring to obtain aluminum powder liquid, mixing the rest raw materials to obtain a solid mixture, adding the aluminum powder liquid into the solid mixture while stirring, and continuously stirring for 5-8min to obtain mixed slurry; and pouring the mixed slurry into a mold for molding to obtain the aerated brick.
By adopting the technical scheme, the aerated brick with excellent cracking resistance can be obtained.
In summary, the present application has the following beneficial effects:
1. the anti-cracking fiber obtained by heat treatment of the flax fiber is adopted, so that the binding water in the flax fiber is removed by the heat treatment, the possibility that the flax fiber generates cracks due to pores generated by heated dehydration in the processing process of the aerated brick is reduced, and the anti-cracking performance of the aerated brick is effectively improved; and the surface roughness of the flax fibers after heat treatment is enhanced, so that the combination of the anti-crack fibers and the aggregate in the aerated brick is enhanced, the anti-crack fibers can stably exist in the aerated brick, and the anti-crack performance of the aerated brick is further improved.
2. The modified anti-crack fibers obtained by performing surface hydrophobic modification on the anti-crack fibers are adopted, and the modified anti-crack fibers can be well dispersed in the aerated brick, so that the anti-crack performance of the aerated brick is further improved.
3. According to the preparation method, the hydrophobic nano filler is added, and the hydrophobic modified nano filler obtained by modifying the nano filler by the silane coupling agent can be more fully dispersed in the aerated brick, so that the strength of the aerated brick is further improved, and the possibility of cracks of the aerated brick due to external force is reduced; and the silane coupling agent introduces polar groups into the particles in the nano filler, so that the connection between the nano filler and the anti-cracking fibers is enhanced, the nano filler can be uniformly dispersed around the anti-cracking fibers, the compressive strength and the anti-cracking performance around the anti-cracking fibers are further enhanced, the possibility of cracks generated by the aerated brick under pressure is further reduced, and the anti-cracking performance of the aerated brick is greatly improved.
Detailed Description
The present application is further described in detail with reference to the following examples, which are specifically illustrated by the following: the following examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer, and the starting materials used in the following examples are available from ordinary commercial sources unless otherwise specified.
The foam stabilizer is dodecyl dimethyl amine oxide;
the water reducing agent is a polycarboxylic acid high-performance water reducing agent.
Preparation example of anti-crack fiber
Preparation example 1
A preparation method of the anti-crack fiber comprises the following steps: heating 20kg of flax fiber to 215 ℃ under the protection of nitrogen and continuously heating for 30min to obtain the anti-crack fiber.
Preparation example 2
A preparation method of the anti-crack fiber comprises the following steps: and heating 30kg of flax fibers to 235 ℃ under the protection of nitrogen, and continuously heating for 45min to obtain the anti-crack fibers.
Preparation example 3
A preparation method of the anti-crack fiber comprises the following steps: heating 25kg of flax fibers to 225 ℃ under the protection of nitrogen and continuously heating for 40min to obtain the anti-crack fibers.
Preparation example of modified anti-crack fiber
Preparation example 4
A preparation method of modified anti-crack fibers comprises the following steps: adding 30kg of polyethylene into 50kg of trichloroethylene under stirring at 75 ℃, and continuously stirring for 20min to obtain a modifier; adding 10kg of anti-crack fiber into the modifier while stirring to obtain a mixed solution, continuously heating the mixed solution at 90 ℃ for 40min, and filtering to obtain the modified anti-crack fiber.
Preparation example 5
A preparation method of modified anti-crack fibers comprises the following steps: adding 40kg of polyethylene into 60kg of trichloroethylene under stirring at 85 ℃, and continuously stirring for 30min to obtain a modifier; adding 20kg of anti-crack fiber into the modifier while stirring to obtain a mixed solution, continuously heating the mixed solution at 95 ℃ for 50min, and filtering to obtain the modified anti-crack fiber.
Preparation example 6
A preparation method of modified anti-crack fibers comprises the following steps: adding 35kg of polyethylene into 55kg of trichloroethylene under stirring at the temperature of 80 ℃, and continuously stirring for 25min to obtain a modifier; adding 15kg of anti-crack fiber into the modifier while stirring to obtain a mixed solution, continuously heating the mixed solution at 90 ℃ for 45min, and filtering to obtain the modified anti-crack fiber.
Preparation example of nanofiller
Preparation example 7
A nanofiller comprising 8kg of nano-silicon nitride and 2kg of nano-silica aerogel.
Preparation example 8
A nanofiller comprising 8.5kg of nano silicon nitride and 1.5kg of nano silica aerogel.
Preparation example 9
A nanofiller comprising 8.2kg of nano silicon nitride and 1.8kg of nano silica aerogel.
Hydrophobic nanofiller
Preparation example 10
A method of preparing a hydrophobic nanofiller comprising the steps of: adding 10kg of nano filler into 30kg of acetone while stirring to obtain a suspension, adding 15kg of silane coupling agent into the suspension while stirring to obtain a base solution, continuously stirring the base solution at 85 ℃ for 40min, and filtering to obtain the hydrophobic nano filler.
Preparation example 11
A method of preparing a hydrophobic nanofiller comprising the steps of: adding 15kg of nano filler into 50kg of acetone while stirring to obtain a suspension, adding 25kg of silane coupling agent into the suspension while stirring to obtain a base solution, continuously stirring the base solution at 95 ℃ for 50min, and filtering to obtain the hydrophobic nano filler.
Preparation example 12
A method of preparing a hydrophobic nanofiller comprising the steps of: adding 12kg of nano filler into 40kg of acetone while stirring to obtain a suspension, adding 20kg of silane coupling agent into the suspension while stirring to obtain a base solution, continuously stirring the base solution at 95 ℃ for 45min, and filtering to obtain the hydrophobic nano filler.
Examples
Example 1
A preparation method of an aerated brick containing brick slag comprises the following steps:
adding 2.6kg of aluminum powder into 1550kg of water while stirring to obtain an aluminum powder liquid, mixing 2500kg of sand, 470kg of waste brick slag, 180kg of lime, 130kg of cement, 30kg of gypsum, 1kg of a water reducing agent and 1kg of a foam stabilizer to obtain a solid mixture, adding the aluminum powder liquid into the solid mixture while stirring, and continuously stirring for 5min to obtain a mixed slurry; and pouring the mixed slurry into a mold for molding to obtain the aerated brick.
Example 2
A preparation method of an aerated brick containing brick slag comprises the following steps:
adding 2.8kg of aluminum powder into 1650kg of water while stirring to obtain aluminum powder liquid, mixing 1900kg of sand, 500kg of waste brick slag, 200kg of lime, 150kg of cement, 50kg of gypsum, 1.5kg of water reducing agent and 1.5kg of foam stabilizer to obtain solid mixture, adding the aluminum powder liquid into the solid mixture while stirring, and continuously stirring for 8min to obtain mixed slurry; and pouring the mixed slurry into a mold for molding to obtain the aerated brick.
Example 3
A preparation method of an aerated brick containing brick slag comprises the following steps:
adding 2.7kg of aluminum powder into 1600kg of water while stirring to obtain an aluminum powder solution, mixing 2000kg of sand, 480kg of waste brick slag, 190kg of lime, 140kg of cement, 40kg of gypsum, 1kg of a water reducing agent and 1.5kg of a foam stabilizer to obtain a solid mixture, adding the aluminum powder solution into the solid mixture while stirring, and continuously stirring for 6min to obtain a mixed slurry; and pouring the mixed slurry into a mold for molding to obtain the aerated brick.
Example 4
The preparation method of the aerated brick containing the brick slag is carried out according to the method in the embodiment 3, and the difference is that 5kg of anti-crack fibers in the raw materials are prepared by the method in the preparation embodiment 2.
Example 5
The preparation method of the aerated brick containing the brick slag is carried out according to the method in the embodiment 3, and the difference is that 5kg of anti-crack fibers in the raw materials are prepared by the method in the preparation embodiment 3.
Example 6
The preparation method of the brick slag-containing aerated brick is carried out according to the method in the embodiment 3, and is characterized in that 5kg of anti-crack fibers and the like in the raw materials are replaced by 5kg of modified anti-crack fibers prepared by the method in the preparation embodiment 4.
Example 7
The preparation method of the aerated brick containing the brick slag is carried out according to the method in the embodiment 3, and the difference is that 5kg of anti-crack fibers and the like in the raw materials are replaced by 5kg of modified anti-crack fibers prepared by the method in the preparation embodiment 5.
Example 8
A preparation method of an aerated brick containing brick slag is carried out according to the method in the embodiment 3, and the difference is that 5kg of anti-crack fibers and the like in raw materials are replaced by 5kg of modified anti-crack fibers prepared by the method in the preparation embodiment 6.
Example 9
The preparation method of the aerated brick containing the brick slag is carried out according to the method in the embodiment 8, and the difference is that 1kg of the nano filler prepared by the method in the preparation embodiment 7 is also included in the raw materials.
Example 10
The preparation method of the brick slag-containing aerated brick is carried out according to the method in the embodiment 8, and is characterized in that the raw materials further comprise 3kg of the nano filler prepared by the method in the preparation embodiment 8.
Example 11
The preparation method of the aerated brick containing the brick slag is carried out according to the method in the embodiment 8, and the difference is that 2kg of the nano filler prepared by the method in the preparation embodiment 9 is also included in the raw materials.
Example 12
A preparation method of an aerated brick containing brick residues is carried out according to the method in the embodiment 11, and the difference is that 2kg of hydrophobic nano filler prepared by the method in the preparation embodiment 10 is replaced by 2kg of nano filler with the same weight in raw materials.
Example 13
A preparation method of an aerated brick containing brick residues is carried out according to the method in the embodiment 11, and the difference is that 2kg of hydrophobic nano filler prepared by the method in the preparation embodiment 11 is replaced by 2kg of nano filler with the same weight in raw materials.
Example 14
A preparation method of an aerated brick containing brick residues is carried out according to the method in the embodiment 11, and the difference is that 2kg of hydrophobic nano filler prepared by the method in the preparation embodiment 12 is replaced by 2kg of nano filler with the same weight in raw materials.
Comparative example
Comparative example 1
The preparation method of the aerated brick containing the brick slag is carried out according to the method in the embodiment 5, and is characterized in that anti-crack fibers are not added in the raw materials.
Comparative example 2
The preparation method of the aerated brick containing the brick residues is carried out according to the method in the embodiment 5, and the difference is that 8kg of anti-crack fibers and the like in the raw materials are replaced by 8kg of coconut shell fibers.
Comparative example 3
The preparation method of the aerated brick containing the brick residues is carried out according to the method in the embodiment 5, and the difference is that 8kg of anti-crack fibers and the like in the raw materials are replaced by 8kg of common flax fibers.
Comparative example 4
The preparation method of the aerated brick containing the brick residues is carried out according to the method in the embodiment 5, and the difference is that 8kg of anti-crack fibers and the like in the raw materials are replaced by 8kg of polypropylene fibers.
Performance test
The examples and comparative examples were tested for compressive strength and split tensile strength according to GB/T11969-2008, method for testing autoclaved aerated concrete Performance, the test results are shown in Table 1.
Table 1:
combining example 5 and comparative example 4, and their data in table 1, it can be seen that comparative example 1 differs from example 5 in that no anti-crack fibers are added to the stock; the difference of the comparative example 2 is that 8kg of the anti-crack fiber and the like in the raw materials are replaced by 8kg of the coconut shell fiber; the difference of the comparative example 3 is that 8kg of anti-crack fiber and the like in the raw materials are replaced by 8kg of common flax fiber; the comparative example 4 is different in that 8kg of the anti-crack fiber and the like in the raw material were replaced with 8kg of the polypropylene fiber. The compressive strength and the splitting tensile strength of the aerated bricks in the comparative examples 1 to 4 are both obviously lower than those of the aerated brick in the example 5, which shows that the cracking resistance of the aerated brick can be obviously improved by adopting the cracking resistant fiber obtained by heat treatment of the flax as the raw material in the example 5.
The flax fibers have excellent tensile strength, the anti-cracking performance of the aerated brick can be effectively improved, the anti-cracking fibers are obtained by the flax fibers through a heat treatment method, and the heat treatment removes the binding water in the flax fibers, so that the possibility of cracks generated by pores generated by the aerated brick due to the heated dehydration of the flax fibers in the processing process of the aerated brick is reduced, and the anti-cracking performance of the aerated brick is further improved; and the surface roughness of the flax fibers after heat treatment is enhanced, so that the combination of the anti-crack fibers and the aggregate in the aerated brick is enhanced, the anti-crack fibers can stably exist in the aerated brick, and the anti-crack performance of the aerated brick is further improved.
Combining the data of example 8 and example 5 and table 1, it can be seen that the difference between comparative example 5 and example 8 is that the raw material in example 5 is crack resistant fiber and the modified crack resistant fiber in example 8. The compression strength and the splitting tensile strength of the aerated brick in the embodiment 8 are obviously better than those of the embodiment 5. The modified anti-cracking fiber can further improve the anti-cracking performance of the aerated brick. The modified anti-crack fibers obtained by hydrophobic modification of the anti-crack fibers can be well dispersed in the aerated brick, so that the anti-crack performance of the aerated brick is further improved.
As can be seen by combining example 8 and example 11 with table 1, example 11 differs from example 8 in that the starting material also includes a nanofiller. The compression strength and the splitting tensile strength of the aerated brick in the embodiment 11 are improved compared with those in the embodiment 8; the nano filler is added into the raw materials to improve the crack resistance of the aerated brick. The reason for this is that: the nano silicon nitride in the nano filler has high hardness and excellent wear resistance, and can not be cracked even being rapidly cooled and rapidly heated, and the nano silicon dioxide aerogel is light in weight but high in hardness; the nano silicon nitride and the nano silicon dioxide aerogel are matched, so that the strength of the aerated brick can be effectively improved, and the possibility of cracks of the aerated brick caused by external force is reduced.
Combining example 11 and example 14 with table 1, it can be seen that example 14 differs from example 11 in that the equivalent weight of 2kg nanofiller in the starting material is replaced by 2kg hydrophobic nanofiller. The compression strength and the splitting tensile strength of the aerated brick in the example 14 are further improved compared with those in the example 11; the crack resistance of the aerated brick can be further improved by adding the hydrophobic modified nano-filler into the raw materials.
The reasons for this may be: the hydrophobic modified nano filler obtained by modifying the nano filler by the silane coupling agent can be more fully dispersed in the aerated brick, so that the strength of the aerated brick is further improved, and the possibility of cracks of the aerated brick caused by external force is reduced; and the silane coupling agent introduces polar groups into the particles in the nano filler, and the polar groups on the surfaces of the nano filler particles and the polar groups on the surfaces of the modified fibers act to enhance the relation between the nano filler and the modified anti-cracking fibers, so that the nano filler can be uniformly dispersed around the modified anti-cracking fibers, the compressive strength and the anti-cracking performance around the modified anti-cracking fibers are further enhanced, the possibility of cracks generated by the aerated brick under compression is further reduced, and the anti-cracking performance of the aerated brick is greatly improved.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (9)
1. The aerated brick containing brick slag is characterized by comprising the following raw materials in parts by weight:
2500 parts of 1900-sand-containing materials, 500 parts of 470-waste brick slag-containing materials, 200 parts of 180-lime-containing materials, 150 parts of 130-cement-containing materials, 30-50 parts of gypsum, 2.6-2.8 parts of aluminum powder, 1-1.5 parts of a water reducing agent, 1-1.5 parts of a foam stabilizer, 4-6 parts of anti-crack fibers and 1650 parts of water 1550-containing materials; the anti-crack fibers are obtained by performing a heat treatment method on flax fibers.
2. The aerated brick containing brick slag according to claim 1, which is characterized in that: based on the weight of the anti-crack fiber, the anti-crack fiber is prepared by the method comprising the following steps: heating 20-30 parts of flax fiber to 215-235 ℃ under the protection of nitrogen and continuously heating for 30-45min to obtain the anti-crack fiber.
3. The aerated brick containing brick slag according to claim 2, which is characterized in that: the anti-crack fibers are modified anti-crack fibers, and the modified anti-crack fibers are obtained by performing surface hydrophobic modification on the anti-crack fibers.
4. The aerated brick containing brick slag according to claim 3, which is characterized in that: based on the weight of the modified anti-crack fiber, the modified anti-crack fiber is prepared by the method comprising the following steps:
adding 30-40 parts of polyethylene into 50-60 parts of trichloroethylene under stirring at 75-85 ℃, and continuously stirring for 20-30min to obtain a modifier; adding 10-20 parts of anti-crack fiber into the modifier while stirring to obtain a mixed solution, continuously heating the mixed solution at 90-95 ℃ for 40-50min, and filtering to obtain the modified anti-crack fiber.
5. The aerated brick containing brick slag according to claim 1, which is characterized in that: the aerated brick raw material also comprises 1-3 parts of nano filler.
6. The aerated brick containing brick slag according to claim 5, which is characterized in that: based on the weight of the nano filler, the nano filler comprises the following raw materials in percentage by weight: 80-85% of nano silicon nitride, and the balance of nano silicon dioxide aerogel.
7. The aerated brick containing brick slag according to claim 5, which is characterized in that: the nano filler is a hydrophobic modified nano filler, and the hydrophobic nano filler is obtained by performing hydrophobic modification on the nano filler through a silane coupling agent.
8. The aerated brick containing brick slag according to claim 7, which is characterized in that: based on the weight of the modified nanofiller, the hydrophobic nanofiller is prepared by a method comprising the steps of: adding 10-15 parts of nano filler into 30-50 parts of acetone while stirring to obtain a suspension, adding 15-25 parts of silane coupling agent into the suspension while stirring to obtain a base solution, continuously stirring the base solution at 85-95 ℃ for 40-50min, and filtering to obtain hydrophobic nano filler; the silane coupling agent is vinyl triethoxysilane.
9. The preparation method of the aerated brick containing the brick slag according to any one of claims 1 to 8, which comprises the following steps:
adding aluminum powder into water while stirring to obtain aluminum powder liquid, mixing the rest raw materials to obtain a solid mixture, adding the aluminum powder liquid into the solid mixture while stirring, and continuously stirring for 5-8min to obtain mixed slurry; and pouring the mixed slurry into a mold for molding to obtain the aerated brick.
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Application publication date: 20220830 |