CN114891163B - Early-strength water reducer and preparation method and application thereof - Google Patents
Early-strength water reducer and preparation method and application thereof Download PDFInfo
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- CN114891163B CN114891163B CN202210444410.XA CN202210444410A CN114891163B CN 114891163 B CN114891163 B CN 114891163B CN 202210444410 A CN202210444410 A CN 202210444410A CN 114891163 B CN114891163 B CN 114891163B
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- water reducer
- strength water
- strength
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 116
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 102
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 21
- 150000002148 esters Chemical class 0.000 claims abstract description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 33
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 20
- 239000006185 dispersion Substances 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims description 11
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 11
- 229920001223 polyethylene glycol Polymers 0.000 claims description 11
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 239000007822 coupling agent Substances 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 239000012986 chain transfer agent Substances 0.000 claims description 5
- 238000010979 pH adjustment Methods 0.000 claims description 3
- 239000011178 precast concrete Substances 0.000 claims description 2
- 238000001308 synthesis method Methods 0.000 claims 1
- 230000006870 function Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 36
- 230000000694 effects Effects 0.000 description 21
- 239000004568 cement Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- 239000000654 additive Substances 0.000 description 8
- 239000002585 base Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000002253 acid Substances 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 230000000996 additive effect Effects 0.000 description 5
- 239000003513 alkali Substances 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 description 4
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical group OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- -1 alcohol amine Chemical class 0.000 description 3
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 3
- 239000000292 calcium oxide Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- 235000012241 calcium silicate Nutrition 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- 235000019976 tricalcium silicate Nutrition 0.000 description 3
- 229910021534 tricalcium silicate Inorganic materials 0.000 description 3
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 244000144730 Amygdalus persica Species 0.000 description 2
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 description 2
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 2
- 235000006040 Prunus persica var persica Nutrition 0.000 description 2
- 229930003268 Vitamin C Natural products 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002159 nanocrystal Substances 0.000 description 2
- 230000003472 neutralizing effect Effects 0.000 description 2
- 230000033116 oxidation-reduction process Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 235000019154 vitamin C Nutrition 0.000 description 2
- 239000011718 vitamin C Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 2
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- UMTVCEDYAZNYBU-UHFFFAOYSA-N 2-methylidenebutanedioic acid;sodium Chemical compound [Na].OC(=O)CC(=C)C(O)=O UMTVCEDYAZNYBU-UHFFFAOYSA-N 0.000 description 1
- CFPHMAVQAJGVPV-UHFFFAOYSA-N 2-sulfanylbutanoic acid Chemical compound CCC(S)C(O)=O CFPHMAVQAJGVPV-UHFFFAOYSA-N 0.000 description 1
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 1
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- DKKCQDROTDCQOR-UHFFFAOYSA-L Ferrous lactate Chemical compound [Fe+2].CC(O)C([O-])=O.CC(O)C([O-])=O DKKCQDROTDCQOR-UHFFFAOYSA-L 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004222 ferrous gluconate Substances 0.000 description 1
- 235000013924 ferrous gluconate Nutrition 0.000 description 1
- 229960001645 ferrous gluconate Drugs 0.000 description 1
- 239000004225 ferrous lactate Substances 0.000 description 1
- 235000013925 ferrous lactate Nutrition 0.000 description 1
- 229940037907 ferrous lactate Drugs 0.000 description 1
- 229960001781 ferrous sulfate Drugs 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 description 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 1
- WPONNXIJPKZHGB-UHFFFAOYSA-N formaldehyde;sulfamic acid Chemical compound O=C.NS(O)(=O)=O WPONNXIJPKZHGB-UHFFFAOYSA-N 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- VRIVJOXICYMTAG-IYEMJOQQSA-L iron(ii) gluconate Chemical compound [Fe+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O VRIVJOXICYMTAG-IYEMJOQQSA-L 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction 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
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/405—Organo-inorganic complexes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F292/00—Macromolecular compounds obtained by polymerising monomers on to inorganic 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an early strength water reducer, a preparation method and application thereof. The early-strength water reducer is a polycarboxylate water reducer modified by modified nano alumina; the weight of the modified nano alumina accounts for 0.36-1.5% of the weight of the early strength water reducer; wherein the modified nano alumina is unsaturated ester modified nano alumina. The early-strength water reducer provided by the invention has two functions of water reduction and early strength due to the synergistic effect between the molecular chain of the polycarboxylate water reducer and the modified nano-alumina. The invention also provides a preparation method and application of the early-strength water reducer.
Description
Technical Field
The invention belongs to the technical field of concrete additives, and particularly relates to an early-strength water reducer, a preparation method and application thereof.
Background
In the field of concrete, the water reducer is beneficial to reducing the water consumption of the concrete, improving the working performance, improving the mechanical performance and improving the durability. In the development of building materials, additives with a water-reducing effect mainly comprise: lignin sulfonate material, naphthalene sulfonate formaldehyde condensate, melamine formaldehyde condensate, acetone sulfonate formaldehyde condensate, sulfamate formaldehyde condensate, and third generation polycarboxylic acid additive.
The polycarboxylic acid additive is a generic name of a series of polymers with specific molecular structures and performances, generally, a linear main chain formed by polymerizing monomers and derivatives containing unsaturated double bonds through free radical reaction is connected with comb-shaped copolymers with a plurality of branched chains, the main chain is connected with hydrophilic functional groups such as carboxyl, hydroxyl, sulfonic acid group, amino and the like, and polyoxyethylene (polyoxypropylene) with different polymerization degrees is grafted at the same time as a side chain. Compared with other types of additives, the polycarboxylic acid additive has the outstanding advantages of low mixing amount, good slump retaining performance, low shrinkage rate of concrete, high durability, strong adjustability on molecular structure, high potential for high performance, environmental protection in the production process and the like, so that the proportion of the polycarboxylic acid additive in the concrete additive is higher and higher.
Although the polycarboxylic acid water reducer has good compatibility and matching with the traditional concrete system, along with the shortage of river sand and pebble quilt supply, the construction industry basically only can use machine-made sand stones, and the polycarboxylic acid water reducer has insufficient adaptability to novel concrete containing machine-made sand stones and the like, so that the application of the polycarboxylic acid water reducer is greatly limited.
In addition, as the construction industry technology innovates, the fabricated building is gradually developed, which requires early strength properties of the concrete. In the traditional technology, the early strength of concrete can only be improved by using a compound inorganic salt early strength agent, a compound organic matter early strength agent and a nanocrystal core early strength agent or by using a steam curing method and the like, but the method has a plurality of practical problems. For example, too much inorganic salt early strength agent may have an adverse effect on concrete, and particularly when chloride ions are introduced, it is easy to rust reinforcing bars in a building, and when sulfate salts are introduced, alkali aggregate reaction may be caused. For another example, the complex alcohol amine organic early strength agent has low matching with cement and limited effect of improving early strength. For another example, the nanocrystal core type early strength agent can obviously increase the later strength loss of concrete, so that the early strength agent is not popularized and applied on a large scale.
Because the water reducer is usually required to be added in the concrete preparation process, if the water reducer has early strength performance, the influence of the traditional early strength agent on the concrete performance can be avoided, the step of adding the early strength agent can be reduced, and the preparation flow of the concrete is further saved.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the prior art described above. Therefore, the invention provides an early-strength water reducer which has two functions of reducing water and early strength.
The invention also provides a preparation method of the early-strength water reducer.
The invention also provides application of the early-strength water reducer.
According to one aspect of the invention, an early-strength water reducer is provided, wherein the early-strength water reducer is a modified nano alumina modified polycarboxylate water reducer;
the weight of the modified nano alumina accounts for 0.36-1.5% of the weight of the early-strength water reducer;
the modified nano alumina is unsaturated ester modified nano alumina.
According to a preferred embodiment of the invention, there is at least the following advantageous effect:
(1) The early-strength water reducer provided by the invention contains the modified nano alumina, so that the steric hindrance effect, the electrostatic repulsion dispersing effect, the lubricating effect (ball effect caused by the modified nano alumina) and the filling effect of the early-strength water reducer are increased, and the adaptability of the early-strength water reducer to concrete of various materials is greatly improved.
(2) Hexagonal flaky calcium hydroxide is generated in the hydration process of cement (one of the main components of concrete), and is enriched in a transitional weak area of a concrete microscopic interface, so that the comprehensive performance, particularly the strength, of the concrete is negatively influenced to a certain extent.
After the early-strength water reducer provided by the invention is added into concrete, calcium hydroxide can be formed into hydrated calcium aluminate on the surface of modified nano alumina, namely, calcium hydroxide is consumed, calcium hydroxide crystals are thinned, so that negative effects brought by the calcium hydroxide are weakened, meanwhile, the content of hydration products in a micro-interface transition weak area is also improved, the interface property is optimized, the compactness of cement hardening slurry is improved, and further, the strength and toughness of the concrete are obviously improved (both early-stage strength and later-stage strength are improved).
(3) The modified nano alumina has more hydroxyl groups on the surface, larger specific surface area, stronger adsorption capacity and catalytic activity, and can be uniformly distributed in each micropore of the concrete due to the inherent dispersion effect of the small particle size and the early strength water reducer, and is easy to generate chemical bonding with hydration products in the cement, so that secondary hydration reaction can be generated on the basis of the original reticular structure of the cement hardening slurry in the concrete to form a new compact reticular structure, and the strength of each stage of the concrete is further improved.
(4) In the cement hydration process, the modified nano alumina in the molecular chain of the early strength water reducing agent moves along with the solvent and reacts with calcium oxide and ferric oxide to generate tricalcium aluminate minerals and tetracalcium aluminoferrite, thereby promoting the hydration of tricalcium silicate and playing a vital role in the early strength of concrete.
Modification of the polycarboxylate water reducer by the modified nano-alumina is not simple physical mixing, but grafting the modified nano-alumina into a molecular chain of the polycarboxylate water reducer through the action of a chemical bond. In this way, compared with the method for physically mixing the nano alumina and the polycarboxylate water reducer, the early-strength water reducer provided by the invention has the advantages that the modified nano alumina is determined to be on the molecular chain of the polycarboxylate water reducer due to the action of chemical bonds, so that agglomeration is not easy to occur, and the problems of overhigh local alumina content and high viscosity are not easy to occur; the secondary hydration reaction is more uniform, and the formed net structure is more compact and uniform, so that the strength of the concrete in each time period is improved.
If the local viscosity is increased, the dicalcium silicate is influenced to absorb calcium oxide to generate tricalcium silicate, and the strength of the concrete is influenced. Too low a local content (corresponding to a high local content and a high viscosity) can affect the calcium silicate mineral formation and affect the concrete strength.
(5) The early-strength water reducer provided by the invention needs to control the density of the modified nano alumina in the molecular chain, and the dosage is not in the range defined by the invention, so that the comprehensive performance of the early-strength water reducer is reduced. If the problems occur, the process of absorbing calcium oxide by dicalcium silicate to generate tricalcium silicate is not influenced;
(6) Since alumina is an amphoteric oxide, it is generally believed to be somewhat soluble under acidic conditions, and thus there have been few studies in the conventional art to graft it into the molecular chain of a water reducing agent; in contrast, due to the inertia of silica, there is rather a study to modify polycarboxylate water reducers with silica.
However, due to the inertia of the silicon dioxide, the silicon dioxide only has the steric hindrance effect and the filling effect, but can not cooperate with the polycarboxylate water reducer, so that the early strength performance is improved.
The invention overcomes the prejudice in the traditional technology, and creatively introduces the modified nano alumina into the molecular chain of the early-strength polycarboxylate water reducer; and the strength and toughness of the concrete at each stage are obviously improved by limiting the dosage of the modified nano alumina.
In some embodiments of the invention, the method for synthesizing the modified nano-alumina comprises the following steps:
mixing nanometer alumina, coupling agent and unsaturated ester for reaction.
Therefore, unsaturated bonds can be introduced into the nano alumina, and the unsaturated bonds can introduce the nano alumina into the molecular chain of the early-strength water reducer.
In some embodiments of the invention, the nano-alumina has a particle size of 20nm or less.
In some embodiments of the invention, the coupling agent comprises at least one of KH550 and KH 560.
In some embodiments of the invention, the molar ratio of the nano alumina to the coupling agent is 1-1.8:1-2.5.
In some preferred embodiments of the invention, the molar ratio of the nano-alumina to the coupling agent is about 1:1.
Wherein the mass of the nano alumina is the mass of the nano alumina and Al 2 O 3 Ratio of formula weights.
In some embodiments of the invention, the molar ratio of the nano-alumina to unsaturated ester is 1 to 1.2:1 to 1.6.
In some preferred embodiments of the invention, the molar ratio of the nano-alumina to unsaturated ester is about 1:1.
In some embodiments of the invention, the unsaturated esters include at least one of methyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and phosphorus-based polyesters.
In some embodiments of the invention, the mixing reaction is performed in water.
In some embodiments of the invention, the temperature of the mixing reaction is 50 to 150 ℃.
In some embodiments of the invention, the duration of the mixing reaction is from 2 to 5 hours.
In order to ensure the uniformity of the mixing reaction, stirring assistance can be performed in the mixing reaction process.
In some embodiments of the present invention, the method for synthesizing the modified nano alumina further comprises performing solid-liquid separation after the mixing reaction, and washing and drying the obtained solid; wherein the drying method is vacuum drying.
In some embodiments of the present invention, the preparation raw materials of the early-strength water reducer include: ethylene glycol monovinyl polyethylene glycol ether, small monomers, modified nano alumina, a chain transfer agent, ferrous salt, hydrogen peroxide, a reducing agent E51 and a neutralizing agent.
In some embodiments of the invention, the ethylene glycol monovinyl polyethylene glycol ether has a number average molecular weight of 2400-6000.
In some embodiments of the invention, the ethylene glycol monovinyl polyethylene glycol ether has a number average molecular weight of 4000 to 5000.
In some embodiments of the invention, the small monomers include at least one of acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, and sodium itaconic acid.
In some embodiments of the invention, the chain transfer agent comprises at least one of thioglycolic acid, mercaptopropionic acid, and mercaptobutyric acid.
In some embodiments of the invention, the ferrous salt includes at least one of ferrous sulfate, ferrous gluconate, and ferrous lactate.
In some embodiments of the invention, the hydrogen peroxide has a mass concentration of 25-30%.
In some preferred embodiments of the present invention, the hydrogen peroxide is present in the hydrogen peroxide at a concentration of about 27.5% by mass.
In some embodiments of the invention, the neutralizing agent is an alkaline solution.
In some embodiments of the invention, the alkali in the lye comprises at least one of sodium hydroxide and potassium hydroxide.
In some embodiments of the invention, the alkali concentration in the lye is 28-32% by mass.
In some preferred embodiments of the invention, the alkali concentration in the lye is about 30% by mass.
In some embodiments of the present invention, the preparation raw materials of the early strength water reducer include, in weight percent:
in the dosage range, the densities of hydrophilic groups, hydrophobic groups and other functional groups in the obtained early-strength water reducer are more suitable, and the length of a molecular chain is more appropriate; the final early strength water reducer has better comprehensive performance.
In some embodiments of the invention, the early strength water reducer is prepared from a raw material that also includes water.
In some embodiments of the invention, the sum of the raw materials used for preparing the early-strength water reducer is 100%.
According to a second aspect of the present invention, a preparation method of the early-strength water reducer is provided, which comprises adding a small monomer, an aqueous dispersion formed by the modified nano-alumina, and an aqueous solution formed by a reducing agent E51 and a chain transfer agent together into an aqueous base formed by ethylene glycol monovinyl polyethylene glycol ether, hydrogen peroxide and ferrous salt, and performing polymerization reaction, pH adjustment and concentration adjustment.
The preparation method according to a preferred embodiment of the present invention has at least the following advantageous effects:
the preparation method provided by the invention has the advantages of simple process and low energy consumption, and can also improve the performance of the early-strength water reducer, so that the strength performance of the concrete comprising the early-strength water reducer is enhanced, and other performances are not negatively influenced; specific:
the three components of hydrogen peroxide, ferrous salt and reducing agent E51 form an oxidation-reduction system, and in the polymerization reaction process, the hydrogen peroxide in the hydrogen peroxide is used for preparing Fe 2+ Oxidation to Fe 3+ Simultaneously releases hydroxyl free radical HO which has high reactivity, can react at normal temperature and even low temperature (2-40 ℃), and is continuously consumed; while reducing agent E51 will Fe 3+ Reduction to Fe 2+ Regenerated Fe 2+ The reaction with hydrogen peroxide is carried out again, hydroxyl free radical HO is released by continuous cyclic reaction until the hydrogen peroxide is exhausted, so that the early strength water reducing agent can be synthesized under the conditions of normal temperature and even low temperature, and the preparation method has the advantages of simple process and low energy consumption because heating or cooling is not needed;
in addition, the preparation method has reasonable steps, and the modified nano alumina can be successfully connected into the molecular chain of the early strength water reducer, so that various performances of the early strength water reducer are improved.
In some embodiments of the invention, the mass concentration of the small monomers in the aqueous dispersion is 55 to 58%.
In some embodiments of the invention, the mass concentration of the modified nano-alumina in the aqueous dispersion is 24-25%.
In some embodiments of the invention, the chain transfer agent is present in the aqueous solution at a mass concentration of 4.7 to 5.2%.
In some embodiments of the present invention, the mass concentration of the ethylene glycol monovinyl polyethylene glycol ether in the aqueous base material is 63 to 64%.
In some embodiments of the present invention, the method of disposing the aqueous primer includes sequentially adding the ferrous salt and hydrogen peroxide to the mixture of ethylene glycol monovinyl polyethylene glycol ether and water.
The time interval between the addition of the ferrous salt and the hydrogen peroxide is about 5 minutes.
To ensure a uniform degree of dispersion of the ethylene glycol monovinyl polyethylene glycol ether in water, the mixture of ethylene glycol monovinyl polyethylene glycol ether and water is stirred for about 5 minutes prior to addition of the ferrous salt.
In some embodiments of the invention, the aqueous dispersion is added to the aqueous base for a period of time ranging from 30 to 40 minutes.
In some embodiments of the invention, the aqueous solution is added to the aqueous base for a period of time ranging from 40 to 50 minutes.
In some embodiments of the invention, the time at which the aqueous solution and aqueous dispersion begin to be added to the aqueous base is the same.
In some embodiments of the invention, the polymerization reaction is for a period of 30 to 60 minutes.
In some embodiments of the invention, the preparation process does not require temperature control, i.e., no heating or cooling.
In some embodiments of the invention, the pH of the mixture is between 5 and 8 after the pH adjustment.
In some embodiments of the invention, the early strength water reducer has a solids content of 40 to 50% after the concentration adjustment.
According to a third aspect of the invention, the use of said early strength water reducing agent in the preparation of precast concrete units is proposed.
Detailed Description
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
Example 1
The embodiment prepares the early-strength water reducer, which comprises the following specific processes:
s1, preparing modified nano aluminum oxide:
adding nano aluminum oxide (D50 is about 20 nm), hydroxypropyl acrylate and a coupling agent KH550 into deionized water in a molar ratio of 1:1:1, uniformly dispersing, stirring at 90 ℃ for reaction for 4 hours, cooling to room temperature, and filtering, washing and vacuum drying to obtain modified aluminum oxide;
s2, preparing an early-strength water reducer:
an aqueous solution was prepared by mixing 0.5g of reducing agent E51, 36.25g of water and 1.85g of mercaptoethanol;
29g of acrylic acid, 13g of the modified nano alumina obtained in the step S1 and 10g of water are mixed to prepare an aqueous dispersion;
460g of ethylene glycol monovinyl polyethylene glycol ether (purchased from Liaoning Oak chemical Co., ltd., number average molecular weight of about 5000) and 258g of water are added into a reaction kettle, 1g of ferrous sulfate solution (mass fraction of 1%) is added after stirring for 5min, 4.1g of hydrogen peroxide (mass fraction of 27.5%) is added after 5min, water-based base material is obtained after 5min, the water solution and water-based dispersion liquid are simultaneously added into the water-based base material in a dropwise manner, the water solution is added dropwise for 45min, the water-based dispersion liquid is added dropwise for 35min, the temperature is not controlled, and the polymerization reaction is continued for 60min after the water solution is added dropwise;
s3, adding 13g of alkali liquor (sodium hydroxide, mass fraction is 30%) into the system obtained in the step S2, regulating pH to 5-8 (the product performance is almost the same in the near-neutral acid-base range), and then adding deionized water to dilute to the solid content of about 50%, thus obtaining the polycarboxylate water reducer.
The ratio information of the preparation raw materials used in this example is shown in Table 1.
Example 2
The early strength water reducer is prepared in the embodiment, and the specific process is different from that of the embodiment 1:
(1) In step S2, the mass of mercaptoethanol was 2.0g.
Example 3
The early strength water reducer is prepared in the embodiment, and the specific process is different from that of the embodiment 1:
(1) In the step S1, hydroxypropyl acrylate is replaced by methyl acrylate with equal mass;
(2) In step S2, the mass of acrylic acid in the aqueous dispersion was adjusted to 31g.
Example 4
The early strength water reducer is prepared in the embodiment, and the specific process is different from that of the embodiment 1:
(1) In the step S1, the hydroxypropyl acrylate is replaced by equal-quality hydroxyethyl methacrylate;
(2) In step S2, the mass of acrylic acid in the aqueous dispersion is adjusted to 31g;
(3) In step S2, the mass of ethylene glycol monovinyl polyethylene glycol ether in the water-based primer was adjusted to 450g.
Comparative example 1
The comparative example prepared an early strength water reducer, which was different from example 1 in that:
(1) Step S1 is not included, and modified nano alumina is not added in step S2.
Comparative example 2
The comparative example prepared an early strength water reducer, which was different from example 1 in that:
(1) Step S1 is not included, and in step S3, the modified nano alumina is replaced with unmodified nano alumina.
Comparative example 3
The comparative example prepared an early strength water reducer, which was different from example 1 in that:
(1) In step S2, E51 is replaced with vitamin C.
Comparative example 4
The comparative example prepared an early strength water reducer, which was different from example 1 in that:
(1) In step S2, the mass of the modified nano alumina was adjusted to 18g.
Test examples
The present test example tested the properties of the early strength water reducers prepared in examples 1 to 4 and comparative examples 1 to 3. Wherein:
wherein: in cement paste tests, the fluidity test is carried out in national standard document "concrete admixture homogeneity test method" with reference to GB/T8077-2012, the cement used is PO 42.5 cement in the south of the peach river, in each group of tests, the cement consumption is 300g, the cement pulping water is 87g, and the test results are shown in Table 1; in the concrete test, slump and expansion are tested by referring to national standard document "ordinary concrete mixture Performance test method Standard" with the reference number of GB/T50080-2016; the compressive strength is tested by national standard document "ordinary concrete mechanical property test method Standard" with reference number GB/T50081-2002; the cement adopted is PO 42.5 cement in the south of the peach river, the sand is machine-made sand, the fineness modulus is 3.1, the total content of mud and powder is 8%, and the experimental results are shown in table 2.
Table 1 cement paste test results
In Table 1, the model of the medium rock polycarboxylate superplasticizer is OM301.
From table 1, it can be seen that the fluidity and fluidity retention capability of the paste of the early-strength water reducer prepared by the invention are better than those of the polycarboxylate water reducer of comparative examples 1 to 4 and the polycarboxylate water reducer of the medium rock in market, which shows that the early-strength water reducer provided by the invention has the excellent performance of the polycarboxylate water reducer and can improve the working performance of cement paste.
If the molecular chain of the early-strength water reducer does not contain modified nano alumina, the steric hindrance effect, the sliding effect and the filling effect are lacked, so that the fluidity and the fluidity retention capability of the cement paste containing the early-strength water reducer are obviously reduced.
If the modified nano alumina is replaced by unmodified nano alumina, the molecular chains of the alumina and the water reducing agent exist independently, no interaction occurs, and the dispersibility of the nano alumina cannot be improved; the agglomeration of nano alumina adversely affects the performance of the water reducer, so that the comprehensive performance of the water reducer is further reduced.
If the reducing agent E51 is replaced by vitamin C with equal quality, the effect of the oxidation-reduction couple cannot be fully exerted in the preparation process of the early-strength water reducer, so that the uniformity of the generated early-strength water reducer is poor, and the performance is reduced to a certain extent.
If the dosage of the modified nano alumina exceeds the range required by the invention, the comprehensive performance of the obtained early-strength water reducer is reduced.
Table 2 concrete experimental results
From Table 2, it can be seen that the dispersion property of the polycarboxylate water reducer prepared by the invention on concrete and the compressive strength of the polycarboxylate water reducer in different ages are superior to those of comparative examples 1-4, and the polycarboxylate water reducer in the market of medium rock plates.
In comparative example 1, the results obtained were comparable to the performance of the mesorock polycarboxylate superplasticizer, i.e., did not show significant strength improvement, as the modified nano-alumina was not included.
In comparative example 2, the added nano alumina was not modified, and the dispersion property was poor, and the agglomeration thereof had a negative effect on the strength of concrete.
In comparative example 3, the negative effect of the non-uniformity of molecular weight in the preparation process was almost equivalent to the positive effect of the modified nano-alumina, and the final result was that the performance was equivalent to that of the medium rock-brand polycarboxylate superplasticizer. From this, it is known that uniformity of molecular weight is also an important index for representing the performance of the water reducing agent.
In comparative example 4, the density of nano alumina in the molecular chain of the obtained early-strength water-reducing agent is too high, and the fluidity thereof is poor, whereby the properties of the obtained early-strength water-reducing agent are rather drastically reduced.
While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (8)
1. The early-strength water reducer is characterized in that the early-strength water reducer is a modified nano alumina modified polycarboxylate water reducer;
the weight of the modified nano alumina accounts for 0.36-1.5% of the weight of the early-strength water reducer;
the modified nano alumina is unsaturated ester modified nano alumina;
the preparation raw materials of the early-strength water reducer comprise the following components in percentage by weight:
2. the early strength water reducer according to claim 1, wherein the synthesis method of the modified nano alumina is as follows:
mixing nanometer alumina, coupling agent and unsaturated ester for reaction.
3. The early-strength water reducer according to claim 1, wherein the raw materials for preparing the early-strength water reducer further comprise water.
4. A method for preparing the early-strength water reducer according to any one of claims 1 to 3, which is characterized by comprising the steps of adding a small monomer, an aqueous dispersion formed by the modified nano alumina, an aqueous solution formed by a reducing agent E51 and a chain transfer agent into an aqueous base formed by ethylene glycol monovinyl polyethylene glycol ether, hydrogen peroxide and ferrous salt together, and carrying out polymerization reaction, concentration adjustment and pH adjustment.
5. The method according to claim 4, wherein the aqueous dispersion is added to the aqueous base material for a period of 30 to 40 minutes.
6. The method according to claim 4, wherein the aqueous solution is added to the aqueous base material for a period of 40 to 50 minutes.
7. The method according to any one of claims 4 to 6, wherein the polymerization reaction is carried out for a period of 30 to 60 minutes.
8. Use of an early strength water reducer according to any one of claims 1 to 3 in the preparation of precast concrete units.
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