CN114853395A - Aerogel reinforced geopolymer foam concrete material and preparation method thereof - Google Patents
Aerogel reinforced geopolymer foam concrete material and preparation method thereof Download PDFInfo
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- CN114853395A CN114853395A CN202210402546.4A CN202210402546A CN114853395A CN 114853395 A CN114853395 A CN 114853395A CN 202210402546 A CN202210402546 A CN 202210402546A CN 114853395 A CN114853395 A CN 114853395A
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- aerogel
- foam concrete
- stirring
- concrete material
- geopolymer foam
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 68
- 239000004964 aerogel Substances 0.000 title claims abstract description 55
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 52
- 239000000463 material Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000004965 Silica aerogel Substances 0.000 claims abstract description 40
- 230000003075 superhydrophobic effect Effects 0.000 claims abstract description 34
- 239000002245 particle Substances 0.000 claims abstract description 31
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 239000010881 fly ash Substances 0.000 claims abstract description 25
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000012190 activator Substances 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 15
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011591 potassium Substances 0.000 claims abstract description 14
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 12
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 11
- 239000011812 mixed powder Substances 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 14
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 11
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 7
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000004111 Potassium silicate Substances 0.000 claims description 3
- 238000009775 high-speed stirring Methods 0.000 claims description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000002585 base Substances 0.000 claims description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- ZPIRTVJRHUMMOI-UHFFFAOYSA-N octoxybenzene Chemical compound CCCCCCCCOC1=CC=CC=C1 ZPIRTVJRHUMMOI-UHFFFAOYSA-N 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229940072033 potash Drugs 0.000 claims description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 2
- 235000015320 potassium carbonate Nutrition 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 20
- 238000009413 insulation Methods 0.000 abstract description 19
- 239000000203 mixture Substances 0.000 abstract description 7
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 abstract description 3
- 238000006703 hydration reaction Methods 0.000 abstract description 3
- 229910021536 Zeolite Inorganic materials 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 239000010457 zeolite Substances 0.000 abstract description 2
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 21
- 239000000017 hydrogel Substances 0.000 description 14
- IJOOHPMOJXWVHK-UHFFFAOYSA-N chlorotrimethylsilane Chemical compound C[Si](C)(C)Cl IJOOHPMOJXWVHK-UHFFFAOYSA-N 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000011148 porous material Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000005051 trimethylchlorosilane Substances 0.000 description 6
- 239000013504 Triton X-100 Substances 0.000 description 5
- 229920004890 Triton X-100 Polymers 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000004115 Sodium Silicate Substances 0.000 description 4
- 239000004566 building material Substances 0.000 description 4
- 239000004088 foaming agent Substances 0.000 description 4
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 4
- 229910052911 sodium silicate Inorganic materials 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000499 gel Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000010450 olivine Substances 0.000 description 3
- 229910052609 olivine Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- YZUPZGFPHUVJKC-UHFFFAOYSA-N 1-bromo-2-methoxyethane Chemical compound COCCBr YZUPZGFPHUVJKC-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 125000001165 hydrophobic group Chemical group 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000000693 micelle Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000010754 BS 2869 Class F Substances 0.000 description 1
- 239000004604 Blowing Agent Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 229910052910 alkali metal silicate Inorganic materials 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 229920003041 geopolymer cement Polymers 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/152—Preparation of hydrogels
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/157—After-treatment of gels
- C01B33/158—Purification; Drying; Dehydrating
- C01B33/1585—Dehydration into aerogels
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
- C01B33/157—After-treatment of gels
- C01B33/159—Coating or hydrophobisation
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/064—Silica aerogel
-
- 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
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2111/52—Sound-insulating 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
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- 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
Abstract
The invention discloses an aerogel reinforced geopolymer foam concrete material and a preparation method thereof, the invention places super-hydrophobic silica aerogel and fly ash in a stirrer, and the mixture is mixed at low speed to a uniform state to obtain a dry mixed powder precursor; adding a composite potassium-based alkaline activator into the dry mixed powder precursor, firstly stirring at a low speed for preliminary mixing, then stirring at a high speed for a period of time, and uniformly mixing to obtain an alkaline-activated concrete slurry; adding hydrogen peroxide, an anionic surfactant and a nonionic surfactant in sequence, and stirring at a high speed for a period of time to obtain concrete slurry; and finally, pouring the concrete slurry into a test piece, vibrating for molding, and curing to obtain the aerogel reinforced geopolymer foam concrete material. The sound absorption performance is improved through the through bubble holes of the large-particle aerogel; the heat insulation performance of the foam concrete in a humid environment is improved through super hydrophobicity; the potassium-based composite alkaline exciting agent is used to generate zeolite hydration products, and the fire resistance is excellent.
Description
Technical Field
The invention belongs to the field of building materials, relates to a light heat-insulating sound-absorbing building material, and particularly relates to an aerogel reinforced geopolymer foam concrete material and a preparation method thereof, which belongs to the technology of reinforcing fly ash geopolymer foam concrete by using super-hydrophobic silica aerogel with specific particle size.
Background
With the increasing requirements of people on indoor living quality and sustainable development, the comfort of indoor living environment and building energy conservation are more and more concerned. In developed countries, the energy and carbon dioxide emissions from the building industry account for 40% of the total emissions. Currently, many countries have begun to set policies to reduce heat loss by constructing insulation layers with lower thermal conductivity. In addition, functionalization of insulation materials is becoming more important, for example, enhancing the sound absorption performance of insulation layers to improve indoor environment and reduce noise pollution in daily life. Meanwhile, heat conduction in a damp and hot environment becomes more important, indoor heat transmission in a damp area is remarkably improved, and a heat insulation building material resistant to damp and hot is urgently needed. Therefore, the development of new high-performance heat-insulating sound-absorbing materials is urgent.
The silica aerogel is a super-heat-insulating inorganic material and consists of a three-dimensional network of cross-linked silica nanoparticles and 95 to 99 percent of air. Because the silica aerogel has higher porosity and lower solid thermal conductivity, the total effective thermal conductivity is lower and can reach 0.012-0.018W/(m.K). In addition, the silica aerogel has certain hydrophobicity, and the contact angle with water can reach more than 150 degrees. However, silica aerogels are subject to breakage, so commercial silica aerogels always exist in powder or granular form, and are often incorporated into other substrates, such as glass fiber mats or other lightweight materials, to provide their super-insulating characteristics.
In the prior art, silica aerogel is generally used as a substitute for concrete aggregate, and aims to reduce the thermal conductivity and improve the heat insulation performance. However, aerogel particles vary in size and have a distinct effect on the foam concrete matrix. At present, the improvement of the heat insulation performance and the sound absorption performance of the fly ash geopolymer-based foam concrete material in a humid environment by using the silica aerogel with specific particle size is still blank. In addition, the cost of the existing silica aerogel is high, and the mixing amount is relatively high, so that the cost of a final product is high, and the actual popularization and application are difficult. Therefore, it is very important to utilize the higher porosity (greater than 65%) of geopolymer-based foam concrete. Meanwhile, the fly ash geopolymer with excellent fire resistance and heat insulation performance is used for replacing a portland cement-based matrix, so that the sustainability of the product can be improved, the using amount of silica aerogel can be reduced, and the excellent thermal and acoustic performance can be maintained.
Fly ash based polymer foam concrete is a promising material from the standpoint of reducing carbon dioxide emissions and cost, given the current policy of "carbon neutralization" and "carbon peaking". It is prepared from high-alkali silicate solution (MOH and M) 2 SiO 3 M ═ Na, K) from a source of aluminosilicate (e.g. fly ash). Good high temperature resistance is obtained due to the bond formed in the polyaluminosilicate, which is further improved by the use of potassium-based activators instead of sodium-based activators, which mainly results in zeolite-like hydration products. In addition, the use of industrial by-product (fly ash) in geopolymer has the characteristics of zero energy consumption and environmental friendliness, and improves the sustainability from material manufacturing to building operation.
To prepare the cellular structure of geopolymer foam concrete, chemical or mechanical foaming techniques can be used, which provide a large number of pores within the geopolymer matrix. Using chemical foaming, hydrogen peroxide (H) 2 O 2 ) Is low in cost and is easiest to operate. On the other hand, the surfactant can be reducedIts total Critical Micelle Concentration (CMC), resulting in a large number of micelles and better bubble stability. Simply increase H 2 O 2 The content may cause the escape and aggregation of bubbles, thereby promoting the generation of large bubbles, further reducing the mechanical strength. As the concentration of the foaming agent increases, the number of bubbles decreases, the diameter increases, and a negative effect is produced by simply increasing the content of the foaming agent.
Furthermore, another problem with conventional foam concrete is its high water absorption. Porous building materials can suffer from a reduction in their insulating ability during high humidity wet and dry cycles. In humid environments, the thermal insulation performance generally decreases more, reducing the comfort level in the human room. In addition, the sound absorption performance of common foam concrete is relatively poor, because the pores in the concrete are not communicated with each other, and the multi-scale pore diameter in the matrix is not provided, so that the multi-scale friction and dissipation of sound waves and pore walls are improved. Therefore, there is a need to further improve the thermal insulation and sound absorption properties in a humid environment while slowing down the moisture transport in the foamed concrete.
The specific size of aerogel not only increases the overall porosity of the foamed concrete, but also reduces the bubble agglomeration that results from increasing the blowing agent content. In addition, as the hydrophobic group is used for carrying out surface modification on the hydrogel in the process of preparing the aerogel, the aerogel has super-hydrophobicity, and the super-hydrophobic property of the aerogel can offset the adverse effect of air humidity on the heat insulation performance of the foam concrete. However, silica aerogels have different forms and particle sizes and different hydrophobicity properties. Depending on the process parameters, the particle size is typically between 2 μm and 4000 μm, floating with water contact angles between 120 and 150 degrees. In fact, silica aerogels of different particle sizes have different effects on the sound and heat insulating properties of foamed concrete. No researchers have found the difference of the improvement mechanism of the insulation performance of the super-hydrophobic aerogel with a specific size on the foam concrete.
Disclosure of Invention
Aiming at the defects of the existing foam concrete, the invention aims to provide an aerogel reinforced geopolymer foam concrete material and a preparation method thereof.
In order to realize the purpose, the technical scheme of the invention is as follows:
an aerogel-reinforced geopolymer foam concrete material characterized by: the composite material comprises the following components in percentage by mass:
70-75 parts of fly ash, 25-27 parts of a composite potash base activator, 0.5-1.0 part of hydrogen peroxide, 0.2-0.3 part of an anionic surfactant, 0.1-0.2 part of a nonionic surfactant and 0.6-1.2 parts of super-hydrophobic silica aerogel with the average particle size of 700-4000 microns.
The geopolymer foam concrete is prepared by taking fly ash as a main component, a composite potassium-based alkali activator as an alkali activator, hydrogen peroxide as a foaming agent and a surfactant mixed solution consisting of an anionic surfactant and a nonionic surfactant as a stabilizer, and has excellent fire resistance, heat insulation and sound absorption properties.
Preferably, the contact angle of the super-hydrophobic silica aerogel is more than 150 degrees, and the thermal conductivity is less than 0.020W/(m.K).
Further preferably, the specific surface area of the super-hydrophobic silica aerogel measured by nitrogen adsorption is 500-600 m 2 (ii) g, the apparent density is 0.09-0.11 g/cm 3 。
Preferably, the anionic surfactant is Sodium Dodecyl Sulfate (SDS), and the nonionic surfactant is polyethylene glycol octyl phenyl ether (Triton X-100).
Preferably, the fly ash is class F fly ash, and the specific surface area of the fly ash is 400m 2 Per kg, apparent density 2200kg/m 3 The content of silicon oxide is 50-60 wt.%, the content of aluminum oxide is 20-24 wt.%, and the content of calcium oxide is 5-7 wt.%.
Preferably, the composite potassium-based alkali-activator is configured by potassium hydroxide and potassium silicate solution into an alkali-activator with a modulus of 1.5.
Further preferably, the composite potassium-based alkali activator is: from 0.058 parts of potassium hydroxide, 1 part of potassium silicate solution (K) 2 O 8％,SiO 2 20.8％,72.8％H 2 O) is configured to modulus (SiO) 2 :K 2 O) 1.5, and the content of equivalent potassium oxide is 5.5%.
Preferably, the solid content of the hydrogen peroxide is 25-35%, and the optimal solid content is 30%, and the hydrogen peroxide with the solid content can fully play the role of a good foaming agent.
The invention also provides a preparation method of the aerogel reinforced geopolymer foam concrete material, which is characterized by comprising the following steps of:
and 4, pouring the concrete slurry into a test piece, vibrating for forming, and curing to obtain the aerogel reinforced geopolymer foam concrete material.
Preferably, the low-speed stirring speed is 60-80 rpm, and the high-speed stirring speed is 120-150 rpm.
Preferably, in step 1, the stirrer is a 5L Hobart stirrer, and the stirring speed can be well adjusted, so that the silica aerogel can be prevented from cracking, and the requirement of uniform mixing can be met.
Preferably, in the step 2, the alkali-activated concrete slurry is obtained by firstly stirring at a low speed for 30-45 seconds and then stirring at a high speed for 50-70 seconds (optimally 60 seconds).
Preferably, in step 3, the high-speed stirring time is 25 to 40 seconds.
Preferably, the curing in the step 4 is sealing curing at room temperature, then sealing curing at 55-65 ℃, and then curing at room temperature until the concrete solidification standard is met.
Further preferably, the curing conditions in step 4 are as follows: and (3) sealing and curing at 20 ℃ for 24 hours, then sealing and curing at 60 ℃ for 24 hours, and then curing at room temperature of 20 ℃ for 26 days to finally obtain the aerogel reinforced geopolymer foam concrete material.
The invention also provides a preparation method of the super-hydrophobic silica aerogel, which comprises the following steps:
placing olivine silicon oxide powder and sodium hydroxide particles into water, and then mechanically stirring and reacting for 240min at 80 ℃ in a hydrothermal device to obtain a sodium silicate solution with a modulus of 1.5;
replacement of sodium ions in the sodium silicate solution prepared above to H by ion exchange with Amberlyst 15 resin + And obtaining a silicic acid solution with the pH value of about 2.0-3.0.
And then adding 0.5M ammonia water to adjust the pH value of the silicic acid to about 4.5-6.0 to form the silicon dioxide hydrogel.
And then standing for 36 hours to strengthen the silica hydrogel network, and adding ethanol and n-heptane to perform solvent exchange during the standing process.
And then adding Trimethylchlorosilane (TMCS) and n-heptane solvent with specific concentration to perform hydrophobic surface modification on the hydrogel.
And finally, drying the silica hydrogel to obtain the super-hydrophobic silica aerogel.
The present invention selects 36 hours for the network strengthening stage of the silica hydrogel. Solvent exchange with ethanol and n-heptane, respectively, reduced the surface tension of the pore fluid in the hydrogel. The hydroxyl groups of the aerogel can be substituted with non-polar methyl groups by using Trimethylchlorosilane (TMCS) and n-heptane solvents for surface modification of the hydrogel. When the hydrophobic gel is dried, the silica of the framework is not affected by surface tension, thereby avoiding collapse of the aerogel pores. In addition, the "rebound" effect further reduces the density of the superhydrophobic silica aerogel, -CH 3 The groups are attached to the gel surface. During the process of sufficient evaporation of the pore liquid, the silica aerogel is bounced and increases the volume of the aerogel.Finally, the super-hydrophobic large-particle aerogel is obtained, and the particle size range of the super-hydrophobic large-particle aerogel is 700-4000 micrometers, namely the super-hydrophobic silica aerogel.
The foam concrete prepared by the invention can realize the improvement of the sound absorption performance and the heat insulation performance of the foam concrete in a humid environment through the super-hydrophobic silica aerogel with specific particle size (700-4000 micrometers) under a small doping amount (10-20%), and the prepared geopolymer foam concrete has excellent fire resistance. The sound absorption performance is improved through the capability of the large-particle aerogel for penetrating through bubble holes; due to the super-hydrophobicity of the aerogel, the heat insulation performance of the foam concrete in a humid environment is improved; a potassium-based composite alkaline exciting agent is used to generate a zeolite type hydration product, so that the fire resistance is excellent; the prepared foam concrete takes the fly ash as a precursor, and realizes the reduction of carbon emission and sustainability. Therefore, the composite material is applied to building wall materials, and can improve the heat preservation and insulation, sound absorption performance and fire resistance performance of buildings.
Therefore, compared with the prior art, the invention has the following main advantages and beneficial effects:
1. the aerogel reinforced geopolymer foam concrete material adopts fly ash industrial byproducts, can effectively solve the problem of waste stacking of a thermal power plant, and changes waste into valuable;
2. the aerogel reinforced geopolymer foam concrete material utilizes the low-cost fly ash, the aerogel prepared by waste olivine and other industrial wastes, and reduces the construction cost;
3. the aerogel reinforced geopolymer foam concrete material has excellent heat insulation property in a humid environment, and the attenuation amplitude of the heat insulation property is obviously reduced even in an environment with high humidity of 80%;
4. the aerogel with the specific particle size (700-4000 micrometers) contains a silicon oxide 3D network and more than 98% of pores, and the aerogel particles with the size can improve the communication of the pores inside the foam concrete, so that the open porosity of the foam concrete is directly improved, the aerogel with the specific particles mainly exists among a plurality of foams, the open porosity inside the whole body is greatly improved, and the sound absorption performance is obviously enhanced;
5. the modified hydrophobic aerogel contains hydrophobic groups, so that the overall water absorption of the foam concrete is reduced, the path of water transmission is increased, the tortuosity is improved, and the water absorption of the foam concrete in 30 days at 80% humidity is greatly reduced. The measured thermal conductivity after water absorption is much less elevated than plain geopolymer foam concrete.
6. The super-insulation fireproof geopolymer material of the aerogel reinforced geopolymer foam concrete material has excellent fire resistance, and the shrinkage and strength loss rate after calcination at 800 ℃ in a muffle furnace are far less than those of plain geopolymer concrete.
Drawings
FIG. 1 superhydrophobicity profile of 700-4000 micron superhydrophobic silica aerogel prepared in example 1.
Figure 2 is a graph of the insulation performance results for aerogel reinforced geopolymer foam concrete materials.
FIG. 3 is a graph of the results of the wet thermal performance of aerogel reinforced geopolymer foam concrete materials.
FIG. 4 is a graph of the acoustic absorption coefficient of the aerogel reinforced geopolymer foam concrete material of comparative example 1.
FIG. 5 is a graph of the acoustic absorption coefficient of the aerogel-reinforced geopolymer foam concrete material of examples 1 and 2.
FIG. 6 is a graph of the acoustic absorption coefficient of the aerogel reinforced geopolymer foam concrete material of examples 3 and 4.
FIG. 7 is a graph of the acoustic absorption coefficient of aerogel-reinforced geopolymer foam concrete materials of examples 5 and 6.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1:
preparing super-hydrophobic silica aerogel:
putting 9 parts of olivine silicon oxide powder and 8 parts of sodium hydroxide particles into 100 parts of water, and then mechanically stirring and reacting for 240min at 80 ℃ of a hydrothermal device to obtain a sodium silicate solution with the modulus of 1.5;
replacement of sodium ions in the sodium silicate solution prepared above to H by ion exchange with Amberlyst 15 resin + And obtaining a silicic acid solution with the pH value of about 2.0-3.0.
Then 0.5M ammonia water is added to adjust the pH value of the silicic acid to about 5.5, and the silica hydrogel is formed.
5 parts of ethanol and 5 parts of n-heptane were added to the silica hydrogel to strengthen the hydrogel network for 36 hours.
And (2) carrying out super-hydrophobic modification on the reinforced hydrogel, carrying out surface group replacement reaction on 1 part of silica hydrogel, 0.5 part of Trimethylchlorosilane (TMCS) and 5 parts of n-heptane solvent at normal temperature and normal pressure, and then cleaning the hydrophobic modified gel by using 5 parts of n-heptane solvent to obtain the blocky hydrophobic silica gel.
Drying the silica hydrogel to obtain the super-hydrophobic large-particle aerogel, wherein the particle size range of the super-hydrophobic large-particle aerogel is 700-4000 micrometers, and the super-hydrophobic silica aerogel is obtained.
In this example, the aerogel reinforced geopolymer foam concrete material is prepared as follows:
70 parts of fly ash and 1.2 parts of super-hydrophobic silica aerogel (the particle size is 1200-4000 micrometers) are placed in a Hobart stirrer, and stirred at a low speed for 120s to obtain a uniform dry mixed powder precursor; then stirring 26 parts of the weighed composite potassium-based alkaline activator at a low speed for 45 seconds, and then stirring at a high speed for 60 seconds to obtain uniform alkaline-activated concrete slurry; then, 0.8 part of hydrogen peroxide is added, 0.3 part of anionic surfactant Sodium Dodecyl Sulfate (SDS) and 0.1 part of nonionic surfactant Triton X-100 are added, and the mixture is stirred at a high speed for 30 seconds to obtain the concrete slurry. And then pouring, vibrating and forming, sealing and maintaining all samples at 20 ℃ for 24 hours, then sealing and maintaining at 60 ℃ for 24 hours, and then storing at room temperature for 26 days to obtain the aerogel reinforced geopolymer foam concrete material.
Comparative example 1: the super-hydrophobic silica aerogel was removed on the basis of example 1, and the amounts of other raw materials added were proportionally enlarged, and the kinds of other raw materials and the order of addition were kept in accordance with the examples.
Comparative example 2: on the basis of the embodiment 1, the super-hydrophobic silica aerogel is equivalently replaced by super-hydrophobic silica aerogel particles with the particle size of 2-40 micrometers, the parts are kept unchanged, and the types and the adding sequence of other raw materials are kept consistent with the embodiment.
Comparative example 3: on the basis of the embodiment 1, the super-hydrophobic silica aerogel is equivalently replaced by super-hydrophobic silica aerogel particles with the particle size of 100-700 micrometers, the parts are kept unchanged, and the types and the adding sequence of other raw materials are kept consistent with the embodiment.
Example 2:
in this example, the aerogel reinforced geopolymer foam concrete material is prepared as follows:
70 parts of fly ash and 1.2 parts of super-hydrophobic silica aerogel (the particle size is 700-1200 microns) are placed in a Hobart stirrer, and the mixture is stirred at a low speed for 120s to obtain a uniform dry mixed powder precursor; then stirring 26 parts of the weighed composite potassium-based alkaline activator at a low speed for 45 seconds, and then stirring at a high speed for 60 seconds to obtain uniform alkaline-activated concrete slurry; then, 0.8 part of hydrogen peroxide is added, 0.3 part of anionic surfactant Sodium Dodecyl Sulfate (SDS) and 0.1 part of nonionic surfactant Triton X-100 are added, and the mixture is stirred at a high speed for 30 seconds to obtain the concrete slurry. And then pouring, vibrating and forming, sealing and maintaining all samples at 20 ℃ for 24 hours, then sealing and maintaining at 60 ℃ for 24 hours, and then storing at room temperature for 26 days to obtain the aerogel reinforced geopolymer foam concrete material.
Example 3:
in this example, the aerogel reinforced geopolymer foam concrete material is prepared as follows:
70 parts of fly ash and 1.0 part of super-hydrophobic silica aerogel particles (with the particle size of 1200-4000 micrometers) are placed in a Hobart stirrer, and stirred at a low speed for 60 seconds to obtain a uniform dry mixed powder precursor; then stirring 25 parts of the weighed composite potassium-based alkaline activator at a low speed for 45 seconds, and then stirring at a high speed for 60 seconds to obtain uniform alkaline-activated concrete slurry; then, 1.0 part of hydrogen peroxide is added, 0.2 part of anionic surfactant Sodium Dodecyl Sulfate (SDS) and 0.2 part of nonionic surfactant Triton X-100 are added, and the mixture is stirred at a high speed for 30 seconds to obtain concrete slurry. And then pouring, vibrating and forming, sealing and maintaining all samples at 20 ℃ for 24 hours, then sealing and maintaining at 60 ℃ for 24 hours, and then storing at room temperature for 26 days to obtain the aerogel reinforced geopolymer foam concrete material.
Example 4:
in this example, the aerogel reinforced geopolymer foam concrete material is prepared as follows:
70 parts of fly ash and 1.0 part of super-hydrophobic silica aerogel (the particle size is 700-1200 microns) are placed in a Hobart stirrer, and the mixture is stirred at a low speed for 120s to obtain a uniform dry mixed powder precursor; then stirring 26 parts of the weighed composite potassium-based alkaline activator at a low speed for 45 seconds, and then stirring at a high speed for 60 seconds to obtain uniform alkaline-activated concrete slurry; then, 1.0 part of hydrogen peroxide is added, 0.3 part of anionic surfactant Sodium Dodecyl Sulfate (SDS) and 0.1 part of nonionic surfactant Triton X-100 are added, and the mixture is stirred at a high speed for 30 seconds to obtain the concrete slurry. And then pouring, vibrating and forming, sealing and maintaining all samples at 20 ℃ for 24 hours, then sealing and maintaining at 60 ℃ for 24 hours, and then storing at room temperature for 26 days to obtain the aerogel reinforced geopolymer foam concrete material.
The materials described in the above examples were tested according to the present invention using the international standard "ASTM C384-4, ASTM D5930, EN 12350-1, EN 196-1", the results of which are shown in Table 1, FIG. 2, FIG. 3, FIG. 4.
TABLE 1 aerogel reinforced geopolymer foam concrete material test results
From the above results, it is clear that the thermal conductivity, thermal conductivity under high humidity, and water absorption rate of the aerogel reinforced geopolymer foam concrete material of the present invention are significantly reduced, and the sound absorption coefficient and fire resistance level are significantly improved, as compared to comparative examples 1, 2, and 3.
While embodiments of the present invention have been described above, the above description is intended to be exemplary, not exhaustive, and not limited to any embodiments carelessly. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. An aerogel-reinforced geopolymer foam concrete material characterized by: the composite material comprises the following components in percentage by mass:
70-75 parts of fly ash, 25-27 parts of a composite potash base activator, 0.5-1.0 part of hydrogen peroxide, 0.2-0.3 part of an anionic surfactant, 0.1-0.2 part of a nonionic surfactant and 0.6-1.2 parts of super-hydrophobic silica aerogel with the average particle size of 700-4000 microns.
2. The aerogel reinforced geopolymer foam concrete material of claim 1, wherein: the contact angle of the super-hydrophobic silica aerogel is more than 150 degrees, and the thermal conductivity is less than 0.020W/(m.K).
3. The aerogel reinforced geopolymer foam concrete material of claim 1, wherein: the anionic surfactant is sodium dodecyl sulfate, and the nonionic surfactant is polyethylene glycol octyl phenyl ether.
4. The aerogel reinforced geopolymer foam concrete material of claim 1, wherein: the fly ash is F-grade fly ash, and the specific surface area of the fly ash is 400m 2 Per kg, apparent density 2200kg/m 3 The content of silicon oxide is 50-60 wt.%, the content of aluminum oxide is 20-24 wt.%, and the content of calcium oxide is 5-7 wt.%.
5. The aerogel reinforced geopolymer foam concrete material of claim 1, wherein: the composite potassium-based alkali activator is prepared from potassium hydroxide and potassium silicate solution to form the alkali activator with the modulus of 1.5.
6. The aerogel reinforced geopolymer foam concrete material of claim 1, wherein: the solid content of the hydrogen peroxide is 25-35%.
7. A method of preparing an aerogel reinforced geopolymer foam concrete material as claimed in any one of claims 1 to 6, comprising the steps of:
step 1, placing the super-hydrophobic silica aerogel and the fly ash into a stirrer according to the proportion, and mixing at a low speed to a uniform state to obtain a dry mixed powder precursor;
step 2, adding the composite potassium-based alkaline activator into the dry mixed powder precursor, firstly stirring at a low speed for preliminary mixing, then stirring at a high speed for a period of time, and uniformly mixing to obtain alkaline-activated concrete slurry;
step 3, sequentially adding hydrogen peroxide, an anionic surfactant and a nonionic surfactant, and stirring at a high speed for a period of time to obtain foam concrete slurry;
and 4, pouring the concrete slurry into a test piece, vibrating for molding, and curing to obtain the aerogel reinforced geopolymer foam concrete material.
8. The method of producing a geopolymer foamed concrete according to claim 7, characterized in that: the low-speed stirring speed is 60-80 r/min, and the high-speed stirring speed is 120-150 r/min.
9. The method of producing a geopolymer foamed concrete according to claim 7, characterized in that: and in the step 2, firstly stirring at a low speed for 30-45 seconds, and then stirring at a high speed for 50-70 seconds to obtain the alkali-activated concrete slurry.
10. The method of producing a geopolymer foamed concrete according to claim 7, characterized in that: and in the step 4, the curing is performed by sealing and curing at room temperature, then sealing and curing at 55-65 ℃, and then curing at room temperature until the concrete solidification standard is met.
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