CN114891163A - Early-strength water reducing agent and preparation method and application thereof - Google Patents
Early-strength water reducing agent and preparation method and application thereof Download PDFInfo
- Publication number
- CN114891163A CN114891163A CN202210444410.XA CN202210444410A CN114891163A CN 114891163 A CN114891163 A CN 114891163A CN 202210444410 A CN202210444410 A CN 202210444410A CN 114891163 A CN114891163 A CN 114891163A
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- China
- Prior art keywords
- reducing agent
- early strength
- water reducing
- alumina
- modified nano
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 101
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 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 68
- 239000002253 acid Substances 0.000 claims abstract description 14
- 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 36
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 29
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- 239000006185 dispersion Substances 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 229920000151 polyglycol Polymers 0.000 claims description 12
- 239000010695 polyglycol Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 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 11
- 238000002156 mixing Methods 0.000 claims description 11
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 7
- 238000006116 polymerization reaction Methods 0.000 claims description 7
- 239000012986 chain transfer agent Substances 0.000 claims description 6
- 239000007822 coupling agent Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000008346 aqueous phase Substances 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 3
- 238000010979 pH adjustment Methods 0.000 claims description 3
- 238000001308 synthesis method Methods 0.000 claims description 3
- 239000011178 precast concrete Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 20
- 230000001603 reducing effect Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 36
- 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
- 229920005646 polycarboxylate Polymers 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000012360 testing method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000002585 base Substances 0.000 description 8
- 239000003513 alkali Substances 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 6
- 239000008030 superplasticizer Substances 0.000 description 6
- 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
- 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 compound 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
- 230000036571 hydration Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000126 substance 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
- 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
- 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
- 239000007787 solid Substances 0.000 description 3
- 238000003756 stirring Methods 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
- 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
- 229930003268 Vitamin C Natural products 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect 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
- 238000001816 cooling 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
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 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
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 2
- 230000007704 transition Effects 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
- 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
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical group OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 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
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive 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
- 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
- 238000013329 compounding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 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
- IZZSMHVWMGGQGU-UHFFFAOYSA-L disodium;2-methylidenebutanedioate Chemical compound [Na+].[Na+].[O-]C(=O)CC(=C)C([O-])=O IZZSMHVWMGGQGU-UHFFFAOYSA-L 0.000 description 1
- 230000002708 enhancing effect Effects 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
- 238000010438 heat treatment Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 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
- 230000014759 maintenance of location 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
- 239000005416 organic matter Substances 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
- 238000004537 pulping Methods 0.000 description 1
- 238000007348 radical reaction Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 238000010998 test method Methods 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 reducing agent and a preparation method and application thereof. Wherein the early-strength water reducing agent is a modified nano-alumina modified polycarboxylic acid water reducing agent; the weight of the modified nano alumina accounts for 0.36 to 1.5 percent of the weight of the early strength water reducing agent; wherein the modified nano-alumina is unsaturated ester modified nano-alumina. The early strength water reducing agent provided by the invention has the two effects of water reducing and early strength due to the synergistic effect between the molecular chain of the polycarboxylic acid water reducing agent and the modified nano-alumina. The invention also provides a preparation method and application of the early strength water reducing agent.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to an early strength type water reducing agent, and a preparation method and application thereof.
Background
In the field of concrete, the water reducing agent is beneficial to reducing the water consumption of concrete, improving the working performance, improving the mechanical property and improving the durability. In the development process of building materials, the admixture with the water reducing effect mainly comprises: lignosulfonate substances, naphthalene sulfonate formaldehyde condensates, melamine formaldehyde polycondensates, acetone sulfonate formaldehyde condensates, sulfamate formaldehyde condensates and third-generation polycarboxylic acid additives.
The polycarboxylic acid admixture is a general name of a series of polymers with specific molecular structures and performances, and is a comb-shaped copolymer which is formed by polymerizing monomers containing unsaturated double bonds and derivatives thereof through free radical reaction and has a linear main chain connected with a plurality of branched chains, wherein the main chain is connected with hydrophilic functional groups such as carboxyl, hydroxyl, sulfonic acid, amino and the like, and polyoxyethylene (polyoxypropylene) with different polymerization degrees is grafted as a side chain. Compared with other admixtures, the polycarboxylic acid admixture has the outstanding advantages of low admixture amount, good slump retaining performance, low concrete shrinkage, high durability, strong adjustability on molecular structure, large potential of high performance, environmental protection in the production process and the like, so the proportion of the polycarboxylic acid admixture in the concrete admixture is higher and higher.
Although the polycarboxylic acid water reducing agent has good compatibility and matching property with the traditional concrete system, with the supply shortage of river sand and pebbles, the building industry can only use machine-made sand and stone basically, and the polycarboxylic acid water reducing agent has insufficient adaptability to novel concrete containing machine-made sand and stone and the like, so that the application of the polycarboxylic acid water reducing agent is greatly limited.
In addition, as the construction industry has been technically improved, the assembly type construction has been gradually developed, which requires early strength 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 nanocrystalline core type early strength agent or by steam curing and other methods, but the methods have a plurality of practicability problems. For example, the concrete is adversely affected by the incorporation of an excessive amount of the inorganic salt early strength agent, and particularly when chloride ions are introduced, the steel bars in the building are liable to rust, and when sulfate is introduced, the alkali aggregate reaction may be caused. For another example, the compatibility of the compounded alkanolamine organic early strength agent and cement is low, and the effect of improving the early strength is limited. For another example, the nanocrystalline core type early strength agent can obviously increase the later strength loss of concrete, so that the nanocrystalline core type early strength agent is not popularized and applied on a large scale.
Because the water reducing agent is usually required to be added in the concrete preparation process, if the water reducing agent has the 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 is directed to solving at least one of the problems of the prior art described above. Therefore, the invention provides an early strength type water reducing agent which has two effects of reducing water and early strength.
The invention also provides a preparation method of the early strength type water reducing agent.
The invention also provides an application of the early strength water reducing agent.
According to one aspect of the invention, an early strength type water reducing agent is provided, wherein the early strength type water reducing agent is a modified nano-alumina modified polycarboxylic acid water reducing agent;
the weight of the modified nano alumina accounts for 0.36-1.5% of the weight of the early strength water reducing agent;
the modified nano-alumina is unsaturated ester modified nano-alumina.
According to a preferred embodiment of the present invention, at least the following advantages are provided:
(1) the early strength type water reducing agent provided by the invention contains the modified nano alumina, so that the steric hindrance effect, the electrostatic repulsion force dispersion effect, the lubricating effect (the ball effect brought by the modified nano alumina) and the filling effect of the early strength type water reducing agent are increased, and the adaptability of the early strength type water reducing agent to concrete of various materials is greatly improved.
(2) Hexagonal flaky calcium hydroxide can be generated in the hydration process of cement (one of main components of concrete), and can be enriched in a transition weak area of a concrete micro interface, so that the comprehensive performance, particularly the strength of the concrete, can generate certain negative effects.
After the early-strength water reducing agent provided by the invention is added into concrete, hydrated calcium aluminate can be formed on the surface of the modified nano alumina by the calcium hydroxide, namely the calcium hydroxide is consumed, and calcium hydroxide crystals are refined, so that the negative effects brought by the calcium hydroxide are weakened, the content of a hydrated product in a microscopic interface transition weak area is increased, the interface property is optimized, the compactness of cement hardening slurry is improved, and the strength and the toughness of the concrete are obviously improved (the early strength and the later strength are both increased).
(3) The modified nano-alumina has more hydroxyl groups on the surface, larger specific surface area and stronger adsorption capacity and catalytic activity, can be uniformly distributed in each micropore of concrete due to small particle size and the inherent dispersion effect of the early-strength water reducing agent, and is easy to generate chemical bonding with hydration products in cement, so that secondary hydration reaction can be generated on the basis of the original network structure of cement hardened slurry in the concrete to form a new compact network structure, and the strength of the concrete at each stage is further improved.
(4) In the cement hydration process, the modified nano-alumina in the molecular chain of the early strength type water reducing agent moves along with the solvent, reacts with the calcium oxide and the ferric oxide to generate tricalcium aluminate mineral and tetracalcium aluminoferrite, promotes the hydration of tricalcium silicate, and plays an important role in the early strength of concrete.
The modified nano alumina is used for modifying the polycarboxylate water reducer, and is not simply physically mixed, but grafted in a molecular chain of the polycarboxylate water reducer under the action of chemical bonds. Therefore, compared with a method for physically mixing nano alumina and a polycarboxylate water reducer, in the early strength type water reducer provided by the invention, due to the effect of chemical bonds, modified nano alumina is determined to be on a molecular chain of the polycarboxylate water reducer, so that agglomeration is not easy to occur, and the problems of high local alumina content and high viscosity are not easy to occur; the secondary hydration reaction mentioned above 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 local viscosity) may affect calcium silicate mineral formation and thus concrete strength.
(5) The early strength water reducing agent provided by the invention needs to control the density of the modified nano alumina in the molecular chain, and the use amount is not in the range defined by the invention, so that the comprehensive performance of the early strength water reducing agent is reduced. If the problems occur, the process of absorbing calcium oxide by dicalcium silicate to generate tricalcium silicate cannot be influenced;
(6) because the alumina is an amphoteric oxide, the alumina is generally considered to be dissolved to a certain degree under an acidic condition, so that the traditional technology is rarely researched for grafting the alumina into a molecular chain of the water reducing agent; on the contrary, because of the inertia of silica, it has been studied to modify polycarboxylic acid water reducing agents with silica.
But due to the inertia of the silicon dioxide, the silicon dioxide can only play a role in steric hindrance and filling, but cannot be cooperated with a polycarboxylic acid water reducing agent to improve the early strength performance.
The invention overcomes the prejudice in the traditional technology, and innovatively introduces the modified nano-alumina into the molecular chain of the early-strength polycarboxylate superplasticizer; and the strength and toughness of the concrete at each stage are obviously improved by limiting the using amount of the modified nano aluminum oxide.
In some embodiments of the present invention, the synthesis method of the modified nano alumina is as follows:
mixing nano alumina, a coupling agent and unsaturated ester for reaction.
Therefore, unsaturated bonds can be introduced into the nano-alumina, and then the unsaturated bonds can introduce the nano-alumina into the molecular chain of the early strength water reducing agent.
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 present invention, the molar ratio of the nano-alumina to the coupling agent is about 1: 1.
Wherein the amount of the nano-alumina material refers to the mass and Al thereof 2 O 3 The ratio of the formula amounts.
In some embodiments of the invention, the molar ratio of the nano alumina to the unsaturated ester is 1-1.2: 1-1.6.
In some preferred embodiments of the present invention, the molar ratio of nano alumina to unsaturated ester is about 1: 1.
In some embodiments of the invention, the unsaturated ester comprises at least one of methyl acrylate, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, and a phosphorus-based polyester.
In some embodiments of the invention, the mixing reaction is carried out in water.
In some embodiments of the present invention, the temperature of the mixing reaction is 50 to 150 ℃.
In some embodiments of the present invention, the mixing reaction is carried out for 2 to 5 hours.
In order to ensure the uniformity of the mixing reaction, stirring assistance can be carried out in the mixing reaction process.
In some embodiments of the invention, the synthesis method of 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 raw materials for preparing the early strength water reducing agent comprise: ethylene glycol monovinyl polyglycol ether, small monomer, modified nano alumina, chain transfer agent, ferrous salt, hydrogen peroxide, reducing agent E51 and neutralizing agent.
In some embodiments of the invention, the number average molecular weight of the ethylene glycol monovinyl polyglycol ether is 2400-.
In some embodiments of the invention, the number average molecular weight of the ethylene glycol monovinyl polyglycol ether is 4000-.
In some embodiments of the invention, the small monomer comprises at least one of acrylic acid, methacrylic acid, maleic anhydride, itaconic acid, and sodium itaconate.
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 comprises at least one of ferrous sulfate, ferrous gluconate, and ferrous lactate.
In some embodiments of the present invention, the hydrogen peroxide is present in the hydrogen peroxide in a concentration of 25 to 30% by mass.
In some preferred embodiments of the present invention, the hydrogen peroxide is present in the hydrogen peroxide solution at a concentration of about 27.5% by mass.
In some embodiments of the invention, the neutralizing agent is a lye.
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 alkali liquor is 28-32% by mass.
In some preferred embodiments of the present invention, the concentration of alkali in the lye is about 30% by mass.
In some embodiments of the present invention, the preparation raw materials of the early strength water reducing agent comprise, by weight:
within the dosage range, the density of hydrophilic groups, hydrophobic groups and other functional groups in the obtained early-strength water reducing agent is more suitable, and the length of a molecular chain is more appropriate; the finally obtained early-strength water reducing agent has better comprehensive performance.
In some embodiments of the present invention, the raw material for preparing the early strength water reducing agent further comprises water.
In some embodiments of the present invention, the sum of the amounts of the raw materials for preparing the early strength water reducing agent is 100%.
According to the second aspect of the invention, the preparation method of the early strength water reducing agent is provided, which comprises the steps of adding an aqueous phase dispersion liquid formed by small monomers and the modified nano-alumina, and an aqueous solution formed by a reducing agent E51 and a chain transfer agent into an aqueous base material formed by ethylene glycol monovinyl polyglycol ether, hydrogen peroxide and ferrous salt together, and carrying out polymerization reaction, pH adjustment and concentration adjustment.
The preparation method according to a preferred embodiment of the present invention has at least the following beneficial 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 reducing agent, thereby enhancing the strength performance of concrete containing the early strength water reducing agent without negative influence on other performances; specifically, the method comprises the following steps:
hydrogen peroxide, ferrous salt and a reducing agent E51 form a redox system, and in the polymerization reaction process, the hydrogen peroxide in the hydrogen peroxide reacts Fe 2+ Is oxidized into Fe 3+ Simultaneously, a hydroxyl radical HO & is released, has high reaction activity, can react at normal temperature or even low temperature (2-40 ℃), and is continuously consumed; while the reducing agent E51 converts Fe 3+ Reduction to Fe 2+ Regenerated Fe 2+ The early strength water reducing agent can be synthesized at normal temperature and even low temperature by continuously and circularly reacting to release hydroxyl radical HO & lt- & gt until the hydrogen peroxide is exhausted, 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 grafted 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 present invention, the mass concentration of the small monomer in the aqueous dispersion is 55 to 58%.
In some embodiments of the present invention, the aqueous dispersion liquid has a mass concentration of the modified nano alumina of 24 to 25%.
In some embodiments of the present invention, the mass concentration of the chain transfer agent in the aqueous solution is 4.7-5.2%.
In some embodiments of the invention, the mass concentration of the ethylene glycol monovinyl polyglycol ether in the aqueous primer is 63-64%.
In some embodiments of the present invention, the method of preparing the aqueous primer includes adding the ferrous salt and hydrogen peroxide to the mixture of the ethylene glycol monovinyl polyglycol ether and water in this order.
The time interval between the addition of the ferrous salt and the hydrogen peroxide is about 5 min.
In order to ensure the uniform dispersion degree of the ethylene glycol monovinyl polyglycol ether in water, the mixture of the ethylene glycol monovinyl polyglycol ether and water needs to be stirred for about 5min before the ferrous salt is added.
In some embodiments of the invention, the time period for adding the aqueous dispersion to the aqueous base is 30 to 40 min.
In some embodiments of the invention, the time period for adding the aqueous solution to the aqueous base is 40 to 50 min.
In some embodiments of the invention, the time at which the aqueous solution and the aqueous dispersion start to be added to the aqueous base is the same.
In some embodiments of the present invention, the duration of the polymerization reaction is 30 to 60 min.
In some embodiments of the invention, the preparation method does not require temperature control, i.e., does not require temperature increase or decrease.
In some embodiments of the invention, the pH of the mixture after the pH adjustment is 5 to 8.
In some embodiments of the invention, after the concentration is adjusted, the solid content of the early strength water reducing agent is 40-50%.
According to the third aspect of the invention, the application of the early-strength water reducing agent in the preparation of precast concrete members is provided.
Detailed Description
The concept and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments to fully understand the objects, features and effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention.
Example 1
The embodiment prepares the early strength water reducing agent, and the specific process is as follows:
s1, preparing modified nano-alumina:
adding nano alumina (D50 is about 20nm), hydroxypropyl acrylate and a coupling agent KH550 into deionized water according to a molar ratio of 1:1:1, uniformly dispersing, stirring and reacting at 90 ℃ for 4 hours, cooling to room temperature, filtering, washing and vacuum drying to obtain modified alumina;
s2, preparing an early strength water reducing agent:
mixing 0.5g of reducing agent E51, 36.25g of water and 1.85g of mercaptoethanol to prepare an aqueous solution;
mixing 29g of acrylic acid, 13g of the modified nano-alumina obtained in the step S1 and 10g of water to prepare an aqueous dispersion;
adding 460g of ethylene glycol monovinyl polyglycol ether (purchased from Liaoning Oaku chemical Co., Ltd., number average molecular weight of about 5000) and 258g of water into a reaction kettle, stirring for 5min, adding 1g of ferrous sulfate solution (mass fraction of 1%), adding 4.1g of hydrogen peroxide (mass fraction of 27.5%) after 5min, obtaining a water system base material after 5min, simultaneously dripping the aqueous solution and the aqueous phase dispersion liquid into the water system base material, dripping the aqueous solution for 45min, dripping the aqueous phase dispersion liquid for 35min, not controlling the temperature, and continuing the polymerization reaction for 60min after the aqueous solution is dripped;
s3, adding 13g of alkali liquor (sodium hydroxide, the mass fraction is 30%) into the system obtained in the step S2, adjusting the pH to 5-8 (in the near-neutral acid-base range, the product performance is almost the same), and adding deionized water to dilute until the solid content is about 50% to obtain the polycarboxylic acid water reducer.
The compounding ratio information of the raw materials used in this example is shown in Table 1.
Example 2
The embodiment prepares the early strength water reducing agent, and the specific process is different from the embodiment 1 in that:
(1) in step S2, the mass of mercaptoethanol was 2.0 g.
Example 3
The embodiment prepares the early strength water reducing agent, and the specific process is different from the embodiment 1 in that:
(1) in step S1, replacing hydroxypropyl acrylate with equal mass of methyl acrylate;
(2) in step S2, the mass of acrylic acid in the aqueous dispersion was adjusted to 31 g.
Example 4
The embodiment prepares the early strength water reducing agent, and the specific process is different from the embodiment 1 in that:
(1) in step S1, replacing hydroxypropyl acrylate with hydroxyethyl methacrylate with equal mass;
(2) in step S2, the mass of acrylic acid in the aqueous dispersion was adjusted to 31 g;
(3) in step S2, the mass of ethylene glycol monovinyl polyglycol ether in the aqueous base material was adjusted to 450 g.
Comparative example 1
The comparative example prepares an early strength water reducing agent, and the difference with the example 1 is that:
(1) step S1 is not included, and no modified nano alumina is added in step S2.
Comparative example 2
The comparative example prepares an early strength water reducing agent, and the difference with the example 1 is 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 prepares an early strength water reducing agent, and the difference with the example 1 is that:
(1) in step S2, E51 was changed to vitamin C.
Comparative example 4
The comparative example prepares an early strength water reducing agent, and the difference with the example 1 is that:
(1) in step S2, the amount of modified nano alumina was adjusted to 18 g.
Test examples
The test example tests the performance of the early strength water reducing agent prepared in examples 1 to 4 and comparative examples 1 to 3. Wherein:
wherein: in a cement paste test, the fluidity test is carried out according to the national standard document 'concrete admixture homogeneity test method' with the reference number GB/T8077-2012, the used cement is PO 42.5 cement in the south of Taojiang, the dosage of the cement in each group of tests is 300g, the water for cement pulping is 87g, and the test results are shown in Table 1; in a concrete test, slump and expansion are tested according to the national standard document 'standard of performance test method for common concrete mixture' with the reference number GB/T50080-2016; the test of the compressive strength is carried out by referring to the national standard document 'standard of testing method for mechanical properties of common concrete' with the reference number GB/T50081-2002; the adopted cement is PO 42.5 cement in the south of Taojiang, 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 number of the medium rock polycarboxylate superplasticizer is OM 301.
From table 1, the net slurry fluidity and the fluidity retention capacity of the early strength type water reducing agent prepared by the invention are superior to those of comparative examples 1-4 and commercially available Zhongyan polycarboxylate water reducing agents, which shows that the early strength type water reducing agent provided by the invention retains the excellent performance of the polycarboxylate water reducing agent and can improve the working performance of cement net slurry.
If the molecular chain of the early strength type water reducing agent does not contain the modified nano alumina, the steric hindrance effect, the sliding effect and the filling effect of the early strength type water reducing agent are lacked, so that the fluidity and the fluidity maintaining capability of the cement paste containing the early strength type water reducing agent are obviously reduced.
If the modified nano-alumina is replaced by the unmodified nano-alumina, the molecular chains of the alumina and the water reducing agent independently exist, no interaction occurs, and the dispersibility of the nano-alumina cannot be improved; the agglomeration of the nano alumina adversely affects the performance of the water reducing agent, so that the comprehensive performance of the water reducing agent is further reduced.
If the reducing agent E51 is replaced by vitamin C with equal quality, the effect of redox couple can not be fully exerted in the preparation process of the early strength water reducing agent, and the uniformity of the generated early strength water reducing agent is poor, so 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 reducing agent is reduced.
TABLE 2 concrete test results
From Table 2, the dispersing performance and the compressive strength of the polycarboxylate superplasticizer prepared by the method for concrete in different ages are superior to those of comparative examples 1-4 and the polycarboxylate superplasticizer sold in China rock brands.
In comparative example 1, the results obtained were comparable to the performance of the terra chinensis polycarboxylate superplasticizer, i.e. no significant strength improvement was exhibited, since no modified nano alumina was included.
In comparative example 2, the added nano alumina is not modified, the dispersing performance is poor, and the agglomeration of the nano alumina brings negative effects on the strength of the concrete.
In comparative example 3, the negative effects caused by the uneven molecular weight in the preparation process are almost equivalent to the positive effects caused by the modified nano alumina, and finally, the performance of the modified nano alumina is equivalent to that of the polycarboxylate superplasticizer for Zhongyan brand. Therefore, the uniformity of the molecular weight is also an important index for showing the performance of the water reducer.
In comparative example 4, when the density of nano alumina in the molecular chain of the obtained early strength type water reducing agent is too high, the fluidity thereof is poor, and thus the performances of the obtained early strength type water reducing agent are sharply reduced.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
Claims (10)
1. The early strength type water reducing agent is characterized by being a polycarboxylic acid water reducing agent 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 reducing agent;
the modified nano-alumina is unsaturated ester modified nano-alumina.
2. The early strength water reducing agent according to claim 1, wherein the synthesis method of the modified nano alumina comprises:
mixing nano alumina, a coupling agent and unsaturated ester for reaction.
3. The early strength water reducer according to claim 1 or 2, wherein the raw materials for preparing the early strength water reducer comprise: ethylene glycol monovinyl polyglycol ether, small monomer, modified nano alumina, chain transfer agent, ferrous salt, hydrogen peroxide, reducing agent E51 and neutralizing agent.
4. The early strength water reducer according to claim 3, characterized in that the raw materials for preparing the early strength water reducer comprise, by weight:
5. the early strength water reducer according to claim 4, wherein the raw materials for preparing the early strength water reducer further comprise water.
6. A preparation method of the early strength water reducing agent according to any one of claims 1 to 5, characterized by comprising the steps of adding a small monomer, an aqueous phase dispersion liquid formed by the modified nano alumina, and an aqueous solution formed by a reducing agent E51 and a chain transfer agent into an aqueous base material formed by ethylene glycol monovinyl polyglycol ether, hydrogen peroxide and ferrous salt together, and carrying out polymerization reaction, concentration adjustment and pH adjustment.
7. The method according to claim 6, wherein the aqueous dispersion is added to the aqueous base material for a period of 30 to 40 min.
8. The method according to claim 6, wherein the aqueous solution is added to the aqueous base material for a period of 40 to 50 min.
9. The method according to any one of claims 6 to 8, wherein the polymerization reaction is carried out for 30 to 60 minutes.
10. The application of the early strength water reducing agent as defined in any one of claims 1 to 5 in the preparation of precast concrete members.
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