CN113603442A - Low-cost gypsum-based self-leveling material - Google Patents
Low-cost gypsum-based self-leveling material Download PDFInfo
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- CN113603442A CN113603442A CN202111046823.4A CN202111046823A CN113603442A CN 113603442 A CN113603442 A CN 113603442A CN 202111046823 A CN202111046823 A CN 202111046823A CN 113603442 A CN113603442 A CN 113603442A
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- Prior art keywords
- gypsum
- based self
- powder
- low
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- 239000010440 gypsum Substances 0.000 title claims abstract description 146
- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 146
- 239000000463 material Substances 0.000 title claims abstract description 74
- 239000000843 powder Substances 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 239000002994 raw material Substances 0.000 claims abstract description 25
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000005871 repellent Substances 0.000 claims abstract description 18
- 230000002940 repellent Effects 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 13
- 229920001971 elastomer Polymers 0.000 claims abstract description 9
- 239000003381 stabilizer Substances 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 239000000654 additive Substances 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 14
- 239000004816 latex Substances 0.000 claims description 13
- 229920000126 latex Polymers 0.000 claims description 13
- 230000000996 additive effect Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 12
- 150000001282 organosilanes Chemical class 0.000 claims description 12
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 11
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 11
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 11
- 229920001038 ethylene copolymer Polymers 0.000 claims description 11
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 11
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 11
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 11
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 11
- 102000004169 proteins and genes Human genes 0.000 claims description 11
- 108090000623 proteins and genes Proteins 0.000 claims description 11
- 229910000077 silane Inorganic materials 0.000 claims description 11
- 229940080314 sodium bentonite Drugs 0.000 claims description 11
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 11
- 239000011398 Portland cement Substances 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000006297 dehydration reaction Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 5
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 claims description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 4
- 239000001506 calcium phosphate Substances 0.000 claims description 4
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 4
- 235000011010 calcium phosphates Nutrition 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 claims description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 2
- 229920001732 Lignosulfonate Polymers 0.000 claims description 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 239000004115 Sodium Silicate Substances 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- 239000012190 activator Substances 0.000 claims description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 2
- 239000000920 calcium hydroxide Substances 0.000 claims description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 2
- 150000007942 carboxylates Chemical class 0.000 claims description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 2
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 229910021485 fumed silica Inorganic materials 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- 229920000609 methyl cellulose Polymers 0.000 claims description 2
- 239000001923 methylcellulose Substances 0.000 claims description 2
- 235000010981 methylcellulose Nutrition 0.000 claims description 2
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 claims description 2
- 239000012188 paraffin wax Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 2
- IIACRCGMVDHOTQ-UHFFFAOYSA-M sulfamate Chemical compound NS([O-])(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-M 0.000 claims description 2
- 239000004094 surface-active agent Substances 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
- 235000002906 tartaric acid Nutrition 0.000 claims description 2
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 2
- XYRAEZLPSATLHH-UHFFFAOYSA-N trisodium methoxy(trioxido)silane Chemical compound [Na+].[Na+].[Na+].CO[Si]([O-])([O-])[O-] XYRAEZLPSATLHH-UHFFFAOYSA-N 0.000 claims description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 2
- 238000004078 waterproofing Methods 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 239000004576 sand Substances 0.000 abstract description 11
- 239000002910 solid waste Substances 0.000 abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 abstract description 4
- 230000023556 desulfurization Effects 0.000 abstract description 4
- 239000004570 mortar (masonry) Substances 0.000 abstract description 4
- 239000006227 byproduct Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000000047 product Substances 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 239000010453 quartz Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 18
- 238000010276 construction Methods 0.000 description 12
- 239000002002 slurry Substances 0.000 description 11
- 239000004568 cement Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 125000005372 silanol group Chemical group 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002562 thickening agent 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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
- C04B11/264—Gypsum from the desulfurisation of flue gases
-
- 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
-
- 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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
Abstract
A low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials: the gypsum powder comprises desulfurized gypsum alpha gypsum powder, fly ash, an excitant, a water reducing agent, a defoaming agent, a suspension stabilizer, a water-retaining agent, rubber powder, a water repellent and a retarder. The invention takes the desulfurization gypsum of the power plant desulfurization by-product and the fly ash of the solid waste as main raw materials, realizes the resource utilization of the solid waste, does not need to use machine-made sand or river sand, does not need to mine quartz placer or natural river sand, saves energy, reduces carbon emission, relieves the pressure of environmental resources, and obtains the low-cost gypsum-based self-leveling material product which not only has low cost, but also has good fluidity and high flexural and compressive strength, and all indexes are higher than the requirements specified in the JC/T1023-2021 gypsum-based self-leveling mortar industry standard.
Description
Technical Field
The invention relates to a gypsum-based self-leveling material, in particular to a low-cost gypsum-based self-leveling material.
Background
Ground leveling is an important link in construction in the building industry. Currently, the main method of ground leveling is to use self-leveling materials for leveling. The ground self-leveling material is mainly an inorganic self-leveling material, and the inorganic self-leveling material is divided into a cement-based self-leveling material and a gypsum-based self-leveling material. The gypsum-based self-leveling material has the advantages of high leveling precision, no cracking, no hollowing, controllable thickness, mechanical construction, high efficiency, short construction period, energy conservation, good heat insulation performance and the like which are incomparable with the traditional cement-based self-leveling material.
However, most of gypsum-based self-leveling materials used in the current market are made of common beta building gypsum powder, and the chemical additives are added to ensure that the corresponding functional requirements on the flexural strength and the compressive strength are met, so that the cost of the chemical additives is more than half of the cost of the gypsum-based self-leveling gypsum materials, the application cost of the gypsum-based self-leveling gypsum materials is higher than that of cement-based self-leveling gypsum materials, and the popularization and the application of the gypsum-based self-leveling gypsum materials are hindered.
CN106800401A discloses gypsum-based self-leveling mortar with molybdenum tailings as filler, which is composed of the following components in parts by weight: 50-70 parts of alpha gypsum, 30-45 parts of molybdenum tailings, 0.1-0.2 part of defoaming agent, 0.3-0.5 part of water reducing agent, 1-3 parts of volume stabilizer, 0-1 part of setting time regulator, 0-1 part of thickening agent and 0-1 part of water repellent agent. Although the self-leveling material replaces the common beta building gypsum powder with the alpha gypsum, the obtained self-leveling material has low compressive strength.
CN103288410A discloses an alpha high-strength gypsum-based self-leveling material, which comprises the following raw material components in percentage by weight: alpha high-strength gypsum powder: 40-60%; aggregate: 30-50%; cement: 1-4%; fly ash: 1-4%; redispersible rubber powder: 2-4%; retarder: 0.1-0.3%; water reducing agent: 0.2-0.75%; water-retaining agent: 0.1-0.25%; air entraining agent: 0.1-0.4%; defoaming agent: 0.05-0.15%; wherein the aggregate is fine river sand, and the fineness modulus is controlled to be 2.2-2.4. The self-leveling material alpha-type high-strength gypsum powder is a cementing material, but fine river sand is used as an aggregate and is supplemented with cement, so that the cost is high, the environment is not protected, in addition, the fine river sand or quartz sand also has the problems of high cost, environmental pollution and difficult mining, and the obtained self-leveling material has low breaking strength and compressive strength.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a gypsum-based self-leveling material which is prepared from desulfurized gypsum which is a byproduct of power plant desulfurization and fly ash which is a solid waste as main raw materials, does not need machine-made sand or river sand, is environment-friendly, and has high bending strength and compressive strength and low cost.
The technical scheme adopted by the invention for solving the technical problems is that the low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials: the gypsum powder comprises desulfurized gypsum alpha gypsum powder, fly ash, an excitant, a water reducing agent, a defoaming agent, a suspension stabilizer, a water-retaining agent, rubber powder, a water repellent and a retarder.
Further, the weight parts of the raw materials are as follows: 500 portions of desulfurized gypsum alpha gypsum powder, 500 portions of fly ash, 5 to 10 portions of excitant, 1 to 2 portions of water reducing agent, 0.1 to 0.4 portion of defoaming agent, 0.2 to 0.6 portion of suspension stabilizer, 0.2 to 0.6 portion of water retention agent, 1 to 5 portions of rubber powder, 0.2 to 0.6 portion of water repellent and 0.1 to 0.5 portion of retarder.
Further, the preferable weight parts of the raw materials are as follows: 700 portions of desulfurized gypsum alpha gypsum powder, 400 portions of fly ash, 9 to 10 portions of excitant, 1.2 to 1.5 portions of water reducing agent, 0.2 to 0.3 portion of defoaming agent, 0.4 to 0.5 portion of suspension stabilizer, 0.4 to 0.5 portion of water-retaining agent, 3 to 4 portions of rubber powder, 0.2 to 0.3 portion of water repellent and 0.2 to 0.3 portion of retarder.
Further, the particle size of the fly ash is less than or equal to 300 meshes, wherein the mass content of silicon dioxide is 50-70%, the mass content of aluminum oxide is 20-30%, and the mass content of ferric oxide is 5-10%.
Further, the activator is one or more of sodium hydroxide, calcium hydroxide, sodium silicate powder and portland cement, and preferably portland cement.
Further, the water reducing agent is one or more of a polycarboxylic acid water reducing agent, a melamine water reducing agent, a naphthalene sulfonate water reducing agent, a sulfamate high-efficiency water reducing agent and a melamine water reducing agent, and is preferably a polycarboxylic acid water reducing agent.
Further, the defoaming agent is one or more of tributyl phosphate, a silane defoaming agent and a polyether surfactant, and the silane defoaming agent is preferably selected; the water retaining agent is one or more of hydroxyethyl cellulose, hydroxyethyl methyl cellulose, 400 hydroxypropyl methyl cellulose, methyl cellulose and carboxymethyl cellulose, and preferably 400 hydroxypropyl methyl cellulose.
Further, the suspension stabilizer is one or more of lignosulfonate, sodium bentonite and fumed silica, and preferably sodium bentonite; the rubber powder is one or more of vinyl acetate and ethylene copolymer latex powder, acrylic acid latex powder, polyvinyl alcohol powder and styrene and butadiene copolymer, and preferably vinyl acetate and ethylene copolymer latex powder.
Further, the water repellent is one or more of sodium methyl silicate, an organosilane waterproof agent and paraffin, and preferably an organosilane waterproof agent; the retarder is one or more of protein retarder, carboxylate retarder, sodium polyphosphate, citric acid and tartaric acid, and is preferably protein retarder.
Further, the mass ratio of the gypsum-based self-leveling material to water in mixing and stirring is 1.67-3.33: 1.
Furthermore, the low-cost gypsum-based self-leveling material is stirred with water and then self-leveled to form a hardened body ground, and the hardened body ground can be used after being dried under natural conditions without being maintained.
Further, the water consumption for the standard consistency of the desulfurized gypsum alpha gypsum powder is 0.4-0.5, and the breaking strength is more than or equal to 4.5Mpa after 2 hours.
Further, the preparation method of the desulfurized gypsum alpha gypsum powder comprises the following steps:
(1) uniformly mixing the desulfurized gypsum raw material and the composite additive to obtain a mixture;
(2) placing the mixture obtained in the step (1) in a closed container for dehydration and crystallization reaction, wherein the reaction temperature is 120-150 ℃, the reaction pressure is 0.2-0.5 Mpa, the reaction time is 2-5 h, and then drying to obtain short column-shaped alpha gypsum crystals;
(3) and (3) grinding and modifying the short column-shaped alpha gypsum crystals obtained in the step (2) by using a ball mill, grinding the alpha gypsum crystals to the fineness of 80-200 meshes, and then forming to obtain the desulfurized gypsum alpha gypsum powder.
Further, in the step (1) of the preparation method of the desulfurized gypsum alpha gypsum powder, the composite additive is composed of calcium phosphate, aluminum sulfate and sodium citrate according to a weight ratio of 14-18: 40-50: 2, the adding amount of the composite additive is 1.2-1.6% of the weight of the desulfurized gypsum raw material, preferably, the composite additive is composed of calcium phosphate, aluminum sulfate and sodium citrate according to a weight ratio of 15:45:2, and the adding amount of the composite additive is 1.5% of the weight of the desulfurized gypsum raw material.
Further, in the step (2) of the preparation method of the desulfurized gypsum alpha gypsum powder, the obtained mixture is subjected to dehydration and crystallization reaction in a closed container, the reaction temperature is 125 ℃, the reaction pressure is 0.4Mpa, the reaction time is 3 hours, then drying is carried out, the drying temperature is 105 ℃, the drying time is 2 hours, and the dehydration reaction and the drying are both carried out in the same closed container, so that short columnar alpha gypsum crystals are obtained.
Further, in the step (3) of the preparation method of the desulfurized gypsum alpha gypsum powder, the fineness of the alpha gypsum crystal powder is 100-120 meshes.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention takes the desulfurization gypsum of the power plant by-product and the fly ash of the solid waste as main raw materials, realizes the recycling comprehensive utilization of the solid waste, and the obtained low-cost gypsum-based self-leveling material product has low cost, good fluidity and high breaking and compression strength, all indexes are higher than the requirements specified in the existing industry standard JC/T1023-2021 gypsum-based self-leveling mortar, the dry compression strength of the low-cost gypsum-based self-leveling material of the preferred scheme can reach more than 50Mpa, and the dry breaking strength can reach more than 12 Mpa;
(2) the invention does not need to use machine-made sand or river sand, does not need to mine quartz placer or natural river sand, saves energy, reduces carbon emission, relieves the pressure of environmental resources, reduces the production cost, and simultaneously improves the economic benefit and the environmental protection benefit;
(3) the desulfurized gypsum alpha gypsum powder is uniformly adsorbed on the surfaces of desulfurized gypsum particles by adding and mixing the composite additive, when the desulfurized gypsum is dehydrated in a closed space, the growth habit of gypsum crystals can be changed, the crystal form is limited to longitudinally develop, the crystals are promoted to be converted to short columns, the hydration performance of the gypsum-based self-leveling material is improved, and the early-stage flexural strength and compressive strength are provided;
(4) when the self-leveling material is used, water is stirred into slurry, the slurry is paved on the surface of a base layer by means of self gravity and fluidity, the paving thickness of a general leveling ground is relatively thin, the contact surface of the surface and air is large, if a dry and well ventilated construction site is met, a large amount of water is easily lost before the slurry is hardened, the flowing property of the slurry is reduced, the setting time is too fast, the operability time is greatly shortened, and the normal hydration is seriously influenced;
(5) the addition of the fly ash greatly reduces the cost of the gypsum-based self-leveling material; secondly, under the action of the exciting agent, gypsum, silicon dioxide and aluminum oxide in the system can be hydrated to generate ettringite and hydrated silicate gel, the ettringite and the hydrated silicate gel are continuously increased along with the hydration, and the strength of a hardened body is continuously improved; and with the addition of the organosilane waterproofing agent, silanol groups in the molecular structure react with silanol groups in the silicate material for dehydration and crosslinking, and a layer of insoluble waterproof high molecular compound with a plurality of molecular thicknesses, namely a reticular organosilicon resin film, is generated on the surface and inside of the structural material, so that an excellent hydrophobic layer is formed, the impermeability of the material is greatly improved, and the low-cost gypsum-based self-leveling material has the functions of micro-expansion and compactness increasing, so that the low-cost gypsum-based self-leveling material has high strength and good waterproof performance.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1
The low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials in parts by weight: 500 parts of desulfurized gypsum alpha gypsum powder, 500 parts of fly ash, 5 parts of ordinary portland cement, 1 part of polycarboxylic acid water reducing agent, 0.3 part of silane defoaming agent, 0.4 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 2 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of organosilane water repellent and 0.3 part of protein retarder.
The preparation method of the desulfurized gypsum alpha gypsum powder comprises the following steps:
(1) uniformly mixing a desulfurized gypsum raw material with a composite additive, wherein the composite additive is composed of calcium phosphate, aluminum sulfate and sodium citrate according to a weight ratio of 15:45:2, and the adding amount of the composite additive is 1.5% of the weight of the desulfurized gypsum raw material to obtain a mixture;
(2) carrying out dehydration and crystallization reaction on the obtained mixture in a closed container, wherein the reaction temperature is 125 ℃, the reaction pressure is 0.4Mpa, the reaction time is 3h, then drying is carried out, the drying temperature is 105 ℃, the drying time is 2h, and the dehydration reaction and the drying are both carried out in the same closed container, so as to obtain short columnar alpha gypsum crystals;
(3) and (3) grinding and modifying the short column-shaped alpha gypsum crystals obtained in the step (2) by using a ball mill, grinding the alpha gypsum crystals to the fineness of 120 meshes, and then forming to obtain the desulfurized gypsum alpha gypsum powder.
The following examples and comparative examples the preparation method of desulfurized gypsum alpha gypsum powder was the same as in this example.
The water consumption when this embodiment low-cost gypsum base self-leveling material uses is 0.35 of total weight, adds water and stirs into the thick liquid after, is used for ground self-leveling construction promptly.
And (3) performance detection: the low-cost gypsum-based self-leveling material of the embodiment is subjected to oven dry flexural strength, oven dry compressive strength, bonding tensile strength, fluidity, initial setting time, shrinkage rate, oven dry water absorption rate of 2 hours and ton material yield detection, and the detection results are shown in table 1. The results of the performance tests of the products of the following examples and comparative examples are shown in table 1.
Example 2
The low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials in parts by weight: 600 parts of desulfurized gypsum alpha gypsum powder, 400 parts of fly ash, 10 parts of ordinary portland cement, 1 part of polycarboxylic acid water reducing agent, 0.3 part of silane defoaming agent, 0.4 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 4 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of organosilane water repellent and 0.3 part of protein retarder.
The water consumption when this embodiment low-cost gypsum base self-leveling material uses is 0.35 of total weight, and after stirring becomes the slurry, namely be used for ground self-leveling construction.
Example 3
The low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials in parts by weight: 700 parts of desulfurized gypsum alpha gypsum powder, 300 parts of fly ash, 10 parts of ordinary portland cement, 1.5 parts of a polycarboxylic acid water reducing agent, 0.3 part of a silane defoaming agent, 0.4 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 4 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of an organosilane water repellent and 0.3 part of a protein retarder.
The water consumption when this embodiment low-cost gypsum base self-leveling material uses is 0.3 of total weight, and after stirring becomes the slurry, namely be used for ground self-leveling construction.
Example 4
The low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials in parts by weight: 800 parts of desulfurized gypsum alpha gypsum powder, 200 parts of fly ash, 8 parts of ordinary portland cement, 0.8 part of a polycarboxylic acid water reducing agent, 0.3 part of a silane defoaming agent, 0.6 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 4 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of an organosilane water repellent and 0.3 part of a protein retarder.
The water consumption when this embodiment low-cost gypsum base self-leveling material uses is 0.4 of total weight, and after stirring becomes the slurry, namely be used for ground self-leveling construction.
Example 5
The low-cost gypsum-based self-leveling material is prepared by mixing the following raw materials in parts by weight: 900 parts of desulfurized gypsum alpha gypsum powder, 100 parts of fly ash, 8 parts of ordinary portland cement, 0.3 part of silane defoaming agent, 0.8 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 4 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of organosilane water repellent and 0.3 part of protein retarder.
The water consumption of the low-cost gypsum-based self-leveling material is 0.55 of the total weight when the low-cost gypsum-based self-leveling material is used, and the low-cost gypsum-based self-leveling material is used for ground self-leveling construction after being stirred into slurry.
Comparative example 1
The gypsum-based self-leveling material for the comparative example consists of the following raw materials in parts by weight: 500 parts of desulfurized gypsum alpha gypsum powder, 500 parts of heavy calcium carbonate, 5 parts of ordinary portland cement, 1 part of a polycarboxylic acid water reducing agent, 0.3 part of a silane defoaming agent, 0.4 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 2 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of an organosilane water repellent and 0.3 part of a protein retarder.
When the comparative example self-leveling material is used, the water consumption is 0.35 of the total weight, and the comparative example self-leveling material is used for ground self-leveling construction after being stirred into slurry.
Compared with the embodiment 1, the present embodiment replaces the pulverized fly ash with heavy calcium carbonate, no ettringite is generated in the system, the flexural strength and the compressive strength are reduced, and the water absorption is greatly increased.
Comparative example 2
The gypsum-based self-leveling material for the comparative example consists of the following raw materials in parts by weight: 500 parts of desulfurized gypsum alpha gypsum powder, 500 parts of fly ash, 1 part of polycarboxylic acid water reducing agent, 0.3 part of silane defoaming agent, 0.4 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 2 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of organosilane water repellent and 0.3 part of protein retarder.
When the comparative example self-leveling material is used, the water consumption is 0.35 of the total weight, and the comparative example self-leveling material is used for ground self-leveling construction after being stirred into slurry.
Compared with the embodiment 1, the comparative example has the advantages that in the absence of the excitant, only a small amount of ettringite is generated in the system, the flexural strength and the compressive strength are reduced, and the water absorption is increased.
Comparative example 3
The gypsum-based self-leveling material for the comparative example consists of the following raw materials in parts by weight: 500 parts of desulfurized gypsum alpha gypsum powder, 500 parts of fly ash, 5 parts of ordinary portland cement, 1 part of polycarboxylic acid water reducing agent, 0.3 part of silane defoaming agent, 0.4 part of sodium bentonite, 0.4 part of 400 hydroxypropyl methyl cellulose, 2 parts of vinyl acetate and ethylene copolymer latex powder, 0.2 part of organosilane water repellent and 0.3 part of protein retarder.
When the comparative example self-leveling material is used, the water consumption is 0.35 of the total weight, and the comparative example self-leveling material is used for ground self-leveling construction after being stirred into slurry.
In this comparative example, the water absorption was also increased without adding a water repellent, as compared with example 1.
The self-levelling materials according to examples 1 to 5 of the invention and comparative examples 1 to 3 were tested for relevant properties with reference to the standard JC/T1023 to 2021 gypsum-based self-levelling mortar, the results of which are given in Table 1 below.
TABLE 1 Properties of Gypsum-based self-leveling materials obtained in examples 1 to 5 of the present invention and comparative examples 1 to 3
Test results
Claims (10)
1. The low-cost gypsum-based self-leveling material is characterized by being prepared by mixing the following raw materials: the gypsum powder comprises desulfurized gypsum alpha gypsum powder, fly ash, an excitant, a water reducing agent, a defoaming agent, a suspension stabilizer, a water-retaining agent, rubber powder, a water repellent and a retarder.
2. The low-cost gypsum-based self-leveling material according to claim 1, wherein the raw materials comprise, by weight: 500 portions of desulfurized gypsum alpha gypsum powder, 500 portions of fly ash, 5 to 10 portions of excitant, 1 to 2 portions of water reducing agent, 0.1 to 0.4 portion of defoaming agent, 0.2 to 0.6 portion of suspension stabilizer, 0.2 to 0.6 portion of water retention agent, 1 to 5 portions of rubber powder, 0.2 to 0.6 portion of water repellent and 0.1 to 0.5 portion of retarder.
3. The low-cost gypsum-based self-leveling material according to claim 1 or 2, wherein the fly ash has a particle size of not more than 300 meshes, wherein the mass content of silica is 50 to 70%, the mass content of alumina is 20 to 30%, and the mass content of iron oxide is 5 to 10%.
4. The low-cost gypsum-based self-leveling material according to any one of claims 1 to 3, wherein the activator is one or more of sodium hydroxide, calcium hydroxide, sodium silicate powder and portland cement.
5. The low-cost gypsum-based self-leveling material according to any one of claims 1 to 4, wherein the water reducing agent is one or more of a polycarboxylic acid water reducing agent, a melamine water reducing agent, a naphthalene sulfonate water reducing agent, a sulfamate high-efficiency water reducing agent and a melamine water reducing agent.
6. The low-cost gypsum-based self-leveling material according to any one of claims 1 to 5, wherein the defoaming agent is one or more of tributyl phosphate, a silane defoaming agent and a polyether surfactant; the water-retaining agent is one or more of hydroxyethyl cellulose, hydroxyethyl methyl cellulose, 400 hydroxypropyl methyl cellulose, methyl cellulose and carboxymethyl cellulose.
7. The low-cost gypsum-based self-leveling material according to any one of claims 1 to 6, wherein the suspension stabilizer is one or more of lignosulfonate, sodium bentonite and fumed silica; the rubber powder is one or more of vinyl acetate and ethylene copolymer latex powder, acrylic acid latex powder, polyvinyl alcohol powder and styrene and butadiene copolymer.
8. The low-cost gypsum-based self-leveling material as claimed in any one of claims 1 to 7, wherein the water repellent is one or more of sodium methyl silicate, an organosilane waterproofing agent and paraffin; the retarder is one or more of protein retarder, carboxylate retarder, sodium polyphosphate, citric acid and tartaric acid.
9. The low-cost gypsum-based self-leveling material according to any one of claims 1 to 8, wherein the preparation method of the desulfurized gypsum alpha gypsum powder comprises the following steps:
(1) uniformly mixing the desulfurized gypsum raw material and the composite additive to obtain a mixture;
(2) placing the mixture obtained in the step (1) in a closed container for dehydration and crystallization reaction, wherein the reaction temperature is 120-150 ℃, the reaction pressure is 0.2-0.5 Mpa, the reaction time is 2-5 h, and then drying to obtain short column-shaped alpha gypsum crystals;
(3) and (3) grinding and modifying the short column-shaped alpha gypsum crystals obtained in the step (2) by using a ball mill, grinding the alpha gypsum crystals to the fineness of 80-200 meshes, and then forming to obtain the desulfurized gypsum alpha gypsum powder.
10. The low-cost gypsum-based self-leveling material according to claim 9, wherein in the step (1) of the preparation method of the desulfurized gypsum alpha gypsum powder, the composite additive is composed of calcium phosphate, aluminum sulfate and sodium citrate according to a weight ratio of 14-18: 40-50: 2, and the adding amount of the composite additive is 1.2-1.6% of the weight of the desulfurized gypsum raw material.
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