CN115521121B - Corrosion-resistant cement mortar and preparation method thereof - Google Patents
Corrosion-resistant cement mortar and preparation method thereof Download PDFInfo
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- CN115521121B CN115521121B CN202211261575.XA CN202211261575A CN115521121B CN 115521121 B CN115521121 B CN 115521121B CN 202211261575 A CN202211261575 A CN 202211261575A CN 115521121 B CN115521121 B CN 115521121B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 80
- 230000007797 corrosion Effects 0.000 title claims abstract description 78
- 239000011083 cement mortar Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000003607 modifier Substances 0.000 claims abstract description 49
- 239000004568 cement Substances 0.000 claims abstract description 28
- 239000003112 inhibitor Substances 0.000 claims abstract description 27
- 239000004576 sand Substances 0.000 claims abstract description 22
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 11
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 11
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 11
- XNDZQQSKSQTQQD-UHFFFAOYSA-N 3-methylcyclohex-2-en-1-ol Chemical compound CC1=CC(O)CCC1 XNDZQQSKSQTQQD-UHFFFAOYSA-N 0.000 claims abstract description 8
- ZHJGWYRLJUCMRT-UHFFFAOYSA-N 5-[6-[(4-methylpiperazin-1-yl)methyl]benzimidazol-1-yl]-3-[1-[2-(trifluoromethyl)phenyl]ethoxy]thiophene-2-carboxamide Chemical compound C=1C=CC=C(C(F)(F)F)C=1C(C)OC(=C(S1)C(N)=O)C=C1N(C1=C2)C=NC1=CC=C2CN1CCN(C)CC1 ZHJGWYRLJUCMRT-UHFFFAOYSA-N 0.000 claims abstract description 8
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 84
- 239000004570 mortar (masonry) Substances 0.000 claims description 47
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(2+);cobalt(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 46
- 239000000725 suspension Substances 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 21
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 17
- 235000021355 Stearic acid Nutrition 0.000 claims description 17
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 17
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 17
- 239000008117 stearic acid Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000000395 magnesium oxide Substances 0.000 claims description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 14
- 238000007873 sieving Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 12
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 12
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 12
- 238000005406 washing Methods 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 9
- 230000008018 melting Effects 0.000 claims description 9
- 239000002736 nonionic surfactant Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 claims description 8
- 239000011398 Portland cement Substances 0.000 claims description 7
- QGUAJWGNOXCYJF-UHFFFAOYSA-N cobalt dinitrate hexahydrate Chemical compound O.O.O.O.O.O.[Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O QGUAJWGNOXCYJF-UHFFFAOYSA-N 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000002244 precipitate Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000010881 fly ash Substances 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims 1
- 235000011941 Tilia x europaea Nutrition 0.000 claims 1
- 239000004571 lime Substances 0.000 claims 1
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 abstract description 30
- 230000002209 hydrophobic effect Effects 0.000 abstract description 16
- 235000019359 magnesium stearate Nutrition 0.000 abstract description 15
- 239000000839 emulsion Substances 0.000 abstract description 14
- -1 2-mercapto-1-methylimidazole modified cobaltosic oxide Chemical class 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 49
- 239000004567 concrete Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 17
- 238000006703 hydration reaction Methods 0.000 description 12
- 230000036571 hydration Effects 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 10
- 150000002191 fatty alcohols Chemical class 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 8
- 239000006185 dispersion Substances 0.000 description 8
- GPKIXZRJUHCCKX-UHFFFAOYSA-N 2-[(5-methyl-2-propan-2-ylphenoxy)methyl]oxirane Chemical compound CC(C)C1=CC=C(C)C=C1OCC1OC1 GPKIXZRJUHCCKX-UHFFFAOYSA-N 0.000 description 7
- 238000010521 absorption reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 150000002736 metal compounds Chemical class 0.000 description 7
- 238000004729 solvothermal method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 230000000996 additive effect Effects 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 235000011187 glycerol Nutrition 0.000 description 5
- 229910021389 graphene Inorganic materials 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- PMRYVIKBURPHAH-UHFFFAOYSA-N methimazole Chemical compound CN1C=CNC1=S PMRYVIKBURPHAH-UHFFFAOYSA-N 0.000 description 5
- 239000004890 Hydrophobing Agent Substances 0.000 description 4
- 229910001653 ettringite Inorganic materials 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000004094 surface-active agent Substances 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000007822 coupling agent Substances 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000002715 modification method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000077 silane Inorganic materials 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000003712 anti-aging effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 150000004756 silanes Chemical class 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002352 surface water Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 150000001868 cobalt Chemical class 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
-
- 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/085—Acids or salts thereof containing nitrogen in the anion, e.g. nitrites
-
- 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
- C04B24/08—Fats; Fatty oils; Ester type waxes; Higher fatty acids, i.e. having at least seven carbon atoms in an unbroken chain bound to a carboxyl group; Oxidised oils or fats
- C04B24/085—Higher fatty acids
-
- 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
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/41—Preparation of salts of carboxylic acids
- C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses corrosion-resistant cement mortar and a preparation method thereof, wherein the corrosion-resistant cement mortar consists of the following raw materials in parts by weight: 20-50 parts of cement, 60-150 parts of sand, 3-6 parts of corrosion inhibitor, 1-3 parts of modifier and 8-20 parts of water. The corrosion inhibitor is prepared by combining calcium nitrate tetrahydrate, ferric nitrate nonahydrate and aluminum nitrate nonahydrate with polyvinylpyrrolidone, the modifier is prepared by reacting 2-mercapto-1-methylimidazole modified cobaltosic oxide prepared by hydrothermal emulsion with magnesium stearate, and the corrosion inhibitor and the modifier are mixed with cement mortar to prepare the corrosion-resistant cement mortar. Compared with the prior art, the corrosion-resistant cement mortar prepared by the invention has the advantages of high mechanical strength, good dry shrinkage deformation performance, strong hydrophobic performance, corrosion resistance and wide application range.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to corrosion-resistant cement mortar and a preparation method thereof.
Background
Concrete is an irreplaceable and widely used artificial material in construction, and improving the corrosion resistance of concrete in severe environments is a key for supporting infrastructure. However, the complex nature of the environment, particularly the high concentration of corrosive ions in extreme environments, greatly reduces the stability of the concrete in use, resulting in deterioration of the concrete structure. In addition, the steel bars in the concrete are easy to generate electrochemical reaction, so that the concrete is peeled, longitudinal cracks are formed on the surface, and the bonding performance is degraded. In order to alleviate the permeability of corrosive ions, it is important to develop a preservative that prevents the binding and transfer of corrosive ions in concrete. In the prior art, the following methods are mainly adopted, such as surface coating, corrosion inhibitor, sacrificial anode protection, anti-cracking cementing material combination and the like, but the surface coating formed by the organic materials has stronger toughness and excellent water resistance, but is easily affected by poor abrasion and impact properties, and the adhesive force and the flexibility of the inorganic coating are poor. On the other hand, the addition of the corrosion inhibitor relieves the corrosion of mortar, but the problem of difficult dispersion still exists, and the action time of the inorganic corrosion inhibitor is concentrated in the early stage of the service life of the concrete.
Chinese patent No. 108546024A discloses a corrosion-resistant graphene cement mortar and a preparation method thereof. According to the method, graphene is loaded between layers of bentonite powder, then mixed with cement, sand, coarse aggregate, water and a water reducing agent to prepare cement mortar, and a cationic polyelectrolyte solution is sprayed to prepare the corrosion-resistant graphene cement mortar. Compared with the traditional method, the prepared cement mortar has good dispersibility of graphene in the cement mortar, and the cement mortar product has good corrosion resistance and mechanical properties and outstanding overall performance, and can be widely used in the field of construction. However, the method adopts graphene as a corrosion-resistant functional agent, and has the defects of high manufacturing cost and poor concrete bonding performance.
Publication number CN104496350a provides a corrosion-resistant polymer modified cement mortar and a preparation method thereof: 1) Firstly, uniformly stirring and mixing cement, admixture and sand to obtain a mixture A; 2) Diluting the coupling agent with absolute ethyl alcohol, uniformly spraying the coupling agent on the surface of the mixture A, and uniformly stirring and mixing to obtain a mixture B; 3) Mixing water, a water reducing agent, a polymer and an anti-aging agent to obtain a mixed solution, adding the mixed solution into the mixed material B, stirring and uniformly mixing to obtain a mixed material C, adding a defoaming agent into the mixed material C, standing for 60-90 s, and stirring and uniformly mixing to obtain the polymer modified cement mortar. The invention selects the modified polymer with good performance, the coupling agent and the anti-aging agent, adopts proper feeding sequence and stirring process, ensures that the polymer mortar is truly made to be corrosion-resistant for a long time, has simple and easy preparation method and is suitable for mass production. However, the polymer of the invention is at least one of ethylene-polyvinyl acetate or acrylic emulsion, and the prepared cement mortar has poor flexibility and dispersibility and low mechanical strength.
Therefore, the invention researches a preparation method of the cement mortar corrosion inhibitor. The corrosion inhibitor crystal prepared by the method has good stability and excellent performance. By Fe 3+ Substituted for Al 3+ The positive charges on the surface are increased, and the bonding between the double hydroxide radical layer and the metal ion layer is enhanced. The anti-corrosion agent can effectively block the transfer of corrosive ions and has good anti-corrosion effect when being added into cement mortar.
Disclosure of Invention
In view of the defects of poor dispersibility and easy corrosion of cement mortar in the prior art, the technical problem to be solved by the invention is that 2-mercapto-1-methylimidazole modified cobaltosic oxide and magnesium stearate emulsion prepared by hydrothermal reaction are prepared into a modifier, calcium nitrate tetrahydrate, ferric nitrate nonahydrate and aluminum nitrate nonahydrate are combined with polyvinylpyrrolidone to prepare a corrosion inhibitor, and the modifier and the corrosion inhibitor are adopted to treat the cement mortar to provide the corrosion-resistant cement mortar which has high mechanical strength, good dry shrinkage deformation performance and excellent corrosion resistance.
Improving the water resistance and the impermeability of the cement mortar is an important way for improving the durability of the cement mortar. Currently, the most commonly used methods are classified into surface modification and additive modification. The surface hydrophobic modification method is to carry out hydrophobic modification on the surface after the concrete is solidified, so that a hydrophobic protective layer is formed on the surface of the concrete, and the surface hydrophobic modification method is generally realized through surface coating or dipping. The surface hydrophobically modified approach has a number of disadvantages. When the concrete is exposed to the external environment, the surface coating tends to age, the concrete is easy to crack, and the surface hydrophobic layer is cracked and peeled off, so that the water resistance and the impermeability of the concrete are rapidly reduced. The additive modification may be a more efficient way to modify the surface. The additive modification is to add a modifier in the concrete stirring process, so as to improve the waterproof and impervious performances of the surface and the inside of the concrete. Therefore, compared with the surface hydrophobic modification method, the concrete prepared by the hydrophobic additive method has better performance and longer service life. Currently used hydrophobing agents are mainly liquid silanes and siloxanes, silane emulsions, hydrophobic stearic acid. The inventor optimizes and adjusts the added hydrophobe based on the modification of the additive, and discovers that the introduction of silane or siloxane inhibits the hydration of cement to a certain extent. Probably because the hydrophobicity of the silane weakens the interaction forces between the aggregate and the hydration products at the interface to some extent. Stearic acid or its derivatives are difficult to disperse uniformly in cement mortar systems. Therefore, modifying the existing hydrophobing agent reduces the influence of the hydrophobing agent on cement hydration, improves the dispersion of the hydrophobing agent in mortar, and is an effective way for improving durability. The cost of stearic acid is lower and the preparation of the derivative is easier relative to silanes and siloxanes. The invention prepares the high-performance modifier by the combined action of stearic acid, magnesium oxide and surfactant, and adds the modifier into cement slurry.
However, the modifier is a nano magnesium stearate emulsion formed by heating and reacting stearic acid, magnesium oxide and a surfactant, and has good dispersion property and low surface tension when being added into cement slurry, and has a promotion effect on initially hydrated ettringite, so that the overall hydrophobicity and mechanical property of the cement slurry are improved. However, the hydration speed of the cement is increased and the release of hydration heat is increased after the modifier is added, so that the self-shrinkage performance of the cement mortar is improved. In order to solve the problem, a large number of experiments show that the addition of the structured cobaltosic oxide can be used as a template for forming early ettringite, delay the release of hydration heat, stabilize the structure of hydration products and reduce the influence of the modifier on the self-shrinkage of cement mortar.
In order to achieve the above purpose, the invention provides a corrosion-resistant cement mortar, which comprises the following raw materials: cement, sand, modifier and water.
Preferably, the corrosion-resistant cement mortar comprises the following raw materials in parts by weight: 20-50 parts of cement, 60-150 parts of sand, 1-3 parts of modifier and 8-20 parts of water.
Further preferably, the corrosion-resistant cement mortar consists of the following raw materials in parts by weight: 20-50 parts of cement, 60-150 parts of sand, 3-6 parts of corrosion inhibitor, 1-3 parts of modifier and 8-20 parts of water.
Preferably, the cement is one of ordinary Portland cement, slag Portland cement and fly ash Portland cement.
The sand is common river sand with the grain diameter of 0.35-0.5 mm.
The preparation method of the cement mortar comprises the following steps: weighing raw materials according to a formula, putting cement, sand, a corrosion inhibitor, a modifier and water into a stirrer, stirring for 1-4 min at a stirring rate of 70-100 r/min, then filling the mixture into a mould, vibrating the mixture for 10-20 s while filling mortar, and scraping the surface of the mould by using a mortar cutter after filling; and then placing the mould with the mortar in an environment with the temperature of 18-22 ℃ and the relative humidity of 85-92% for curing, demoulding after 40-50 h, and curing until the curing time is 26-30 days to obtain the corrosion-resistant cement mortar.
The preparation method of the modifier comprises the following steps:
(1) Dispersing magnesium oxide in water to form a suspension;
(2) Heating stearic acid to melt, adding nonionic surfactant and water, then adding ammonia water, and stirring to form a system I; and (3) dropwise adding the suspension in the step (1) into a continuously stirred system I, continuing to react after the dropwise adding is finished, and cooling and adjusting the solid content to obtain the modifier.
Further, the preparation method of the modifier comprises the following steps in parts by weight:
(1) Mixing 3-5 parts of magnesium oxide with 20-30 parts of water, treating for 20-60 min under the ultrasonic power of 50-100W, and then continuously stirring to form suspension;
(2) Heating and melting 20-50 parts of stearic acid at 70-90 ℃, adding 1-3 parts of nonionic surfactant and 100-150 parts of water, and stirring for 30-60 min; then adding 0.3-1 part of ammonia water, and continuing stirring and reacting for 30-60 min to form a system I; dropwise adding the suspension obtained in the step (1) into a continuously stirred system I, and continuously stirring for reaction for 30-60 min after complete dropwise adding; naturally cooling to 20-30 ℃, and regulating the solid content to 20-30% by using water to obtain the modifier.
More preferably, the preparation method of the modifier comprises the following steps:
(1) Mixing soluble metal cobalt salt with an organic solvent, stirring to form a solution, collecting insoluble matters after solvothermal reaction, washing, drying, calcining, crushing and sieving to obtain cobaltosic oxide;
(2) Dispersing magnesium oxide in water to form a suspension;
(3) Heating stearic acid to melt, adding nonionic surfactant and water, then adding ammonia water, and stirring to form a system I; and (3) dropwise adding the suspension in the step (2) into a continuously stirred system I, adding the cobaltosic oxide in the step (1) after dropwise adding, continuously reacting, and cooling and adjusting the solid content to obtain the modifier.
In some preferred embodiments, the preparation method of the modifier comprises the following steps in parts by weight:
(1) Mixing 0.5-1 part of cobalt nitrate hexahydrate, 20-30 parts of isopropyl alcohol and 5-10 parts of glycerol, and stirring for 30-60 min to form a solution; carrying out solvothermal reaction on the solution at 160-180 ℃ for 6-8 hours, naturally cooling, collecting insoluble matters, washing, drying, calcining, crushing and sieving to obtain cobaltosic oxide;
(2) Mixing 3-5 parts of magnesium oxide with 20-30 parts of water, treating for 20-60 min under the ultrasonic power of 50-100W, and then continuously stirring to form suspension;
(3) Heating and melting 20-50 parts of stearic acid at 70-90 ℃, adding 1-3 parts of nonionic surfactant and 100-150 parts of water, and stirring for 30-60 min; then adding 0.3-1 part of ammonia water, and continuing stirring and reacting for 30-60 min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I, adding 1-5 parts of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30-60 min; naturally cooling to 20-30 ℃, and regulating the solid content to 20-30% by using water to obtain the modifier.
Most preferably, the preparation method of the modifier comprises the following steps in parts by weight:
(1) Mixing 0.5-1 part of cobalt nitrate hexahydrate, 0.05-0.1 part of 2-mercapto-1-methylimidazole, 20-30 parts of isopropanol and 5-10 parts of glycerol, and stirring for 30-60 min to form a solution; carrying out solvothermal reaction on the solution at 160-180 ℃ for 6-8 hours, naturally cooling, collecting insoluble matters, washing, drying, calcining, crushing and sieving to obtain cobaltosic oxide;
(2) Mixing 3-5 parts of magnesium oxide with 20-30 parts of water, treating for 20-60 min under the ultrasonic power of 50-100W, and then continuously stirring to form suspension;
(3) Heating and melting 20-50 parts of stearic acid at 70-90 ℃, adding 1-3 parts of nonionic surfactant and 100-150 parts of water, and stirring for 30-60 min; then adding 0.3-1 part of ammonia water, and continuing stirring and reacting for 30-60 min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I, adding 1-5 parts of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30-60 min; naturally cooling to 20-30 ℃, and regulating the solid content to 20-30% by using water to obtain the modifier.
Preferably, the nonionic surfactant in the step (3) is at least one of fatty alcohol polyoxyethylene ether O-20, fatty alcohol polyoxyethylene ether O-25 and fatty alcohol polyoxyethylene ether AEO-9.
The preparation method of the corrosion inhibitor comprises the following steps:
s1, adding calcium nitrate tetrahydrate, ferric nitrate nonahydrate and aluminum nitrate nonahydrate into water to prepare a mixed solution, dripping the mixed solution into a sodium hydroxide aqueous solution, stirring to prepare a suspension, then placing the suspension into a nitrogen environment, stirring, collecting precipitate, washing with water to be neutral, drying, grinding and sieving to obtain mixed fine powder;
s2, dissolving polyvinylpyrrolidone in water for dispersion, then adding the mixed fine powder prepared in the step S1, and carrying out dispersion treatment to obtain the corrosion inhibitor.
Further preferably, the preparation method of the corrosion inhibitor comprises the following steps of:
s1, adding 8-12 parts of calcium nitrate tetrahydrate, 0.5-2 parts of ferric nitrate nonahydrate and 3-5 parts of aluminum nitrate nonahydrate into 80-120 parts of water to prepare a mixed solution, dripping the mixed solution into 80-120 parts of 0.1-0.2 mol/L sodium hydroxide aqueous solution, stirring magnetically for 10-30 min at a stirring speed of 200-400 r/min to prepare a suspension, then placing the suspension in a nitrogen environment, stirring magnetically for 20-30 h at a stirring speed of 500-800 r/min, collecting precipitate, washing with water to neutrality, drying at a temperature of 70-100 ℃ for 10-20 h, and grinding and sieving to obtain mixed fine powder;
s2, dissolving 15-30 parts of polyvinylpyrrolidone in 80-150 parts of water, performing ultrasonic dispersion for 3-10 min, then adding the mixed fine powder prepared in the step S1, and continuing ultrasonic dispersion for 0.5-2 h to obtain the corrosion inhibitor.
Preferably, the sieving in the step S1 is carried out by adopting a 400-600 mesh sieve.
The corrosion inhibitor can remarkably improve the corrosion resistance of cement mortar, and polyvinylpyrrolidone is a dispersible surfactant, so that a protective film can be formed on the surface of a metal compound, uniform dispersion between the metal compound and cement is promoted, particle aggregation is avoided, and the compactness and impedance of a sample are improved. And the barrier effect on corrosive ions can be improved, the migration of corrosive ions is reduced, and the cement mortar prepared by adding the corrosion inhibitor has good corrosion resistance and has good application prospect.
The invention has the beneficial effects that:
(1) Mixing magnesium oxide and stearic acid, adding a nonionic surfactant, preparing magnesium stearate emulsion by utilizing a simple chemical reaction, and obviously improving the hydrophobic property of the inner surface and the outer surface of the mortar as a modifier of the cement mortar;
(2) The addition of the cobaltosic oxide further improves the hydrophobic property of the mortar, the mechanical strength, the water resistance and the chloride ion resistance of the mortar, and the shrinkage performance of the cement mortar;
(3) The corrosion inhibitor prepared by compounding calcium nitrate tetrahydrate, ferric nitrate nonahydrate, aluminum nitrate nonahydrate and polyvinylpyrrolidone improves the barrier effect of cement mortar on corrosive ions, and the prepared cement mortar has good corrosion resistance.
Drawings
FIG. 1 is a scanning electron microscope image of tricobalt tetraoxide prepared according to the examples and comparative examples of the present invention; fig. 1A is comparative example 2, fig. 1B is example 2, and fig. 1C is example 3.
Detailed Description
Introduction of partial materials in the embodiments of the present invention:
cement, portland cement PO 42.5, purchased from hubei new cement limited.
River sand, common river sand belongs to grade I sand and is purchased from Shijiuzhou forest mineral products limited company.
Fatty alcohol polyoxyethylene ether AEO-9, purchased from Shandong, sanchen New Material technology Co., ltd.
2-mercapto-1-methylimidazole, available from Shanghai Ala Biochemical technologies Co., ltd.
Calcium nitrate tetrahydrate, ferric nitrate nonahydrate, and aluminum nitrate nonahydrate are all available from merck corporation.
Polyvinylpyrrolidone available from Shanghai Ala Biochemical technologies Co., ltd.
The preparation method of the corrosion-resistant cement mortar test piece comprises the following steps: the corrosion-resistant cement mortar components in the examples and the comparative examples are put into a stirrer, stirred for 2min at a stirring rate of 80r/min, then filled into a mould, vibrated for 15s while filled with mortar, and after the filling is finished, the surface of the mould is scraped by a mortar cutter; and then placing the mould with the mortar in an environment with the relative humidity of 90 percent at 20 ℃ for curing, demoulding after 48 hours, and curing until the curing time is 28 days to obtain the corrosion-resistant cement mortar test piece.
The test piece with the thickness of 40mm multiplied by 160mm is used for strength test, self-shrinkage test and chemical corrosion resistance test of mortar; 70.7mm by 70.7mm test piece the water absorption test method is used for testing the water absorption of the mortar; a cylindrical sample with a diameter of 100mm and a height of 50mm was used for the chloride ion permeability test of the mortar.
Example 1
A corrosion-resistant cement mortar consists of 20kg of cement, 60kg of river sand, 1kg of modifier and 8.2kg of water.
The preparation method of the modifier comprises the following steps:
(1) Mixing 3kg of magnesium oxide with 25kg of water, treating for 30min at an ultrasonic power of 50W and a frequency of 40kHz, and stirring for 30min at a stirring rate of 350r/min to form a suspension;
(2) Heating and melting 3.5kg of stearic acid at 80 ℃, adding 1kg of fatty alcohol polyoxyethylene ether AEO-9 and 100kg of water, and stirring for 30min at a stirring rate of 350 r/min; then adding 0.5kg of ammonia water, and continuing stirring to react for 3min to form a system I; dropwise adding the suspension obtained in the step (1) into a continuously stirred system I at a dropwise adding rate of 0.5kg/min, and continuously stirring for reaction for 30min after complete dropwise adding; naturally cooling to 25 ℃, and adjusting the solid content to 25% by using water to obtain the modifier.
Example 2
A corrosion-resistant cement mortar consists of 20kg of cement, 60kg of river sand, 1kg of modifier and 8.2kg of water.
The preparation method of the modifier comprises the following steps:
(1) Mixing 0.8kg of cobalt nitrate hexahydrate, 25kg of isopropyl alcohol and 5kg of glycerin, and stirring at a stirring rate of 450r/min for 30min to form a solution; transferring the solution to a reaction kettle, carrying out solvothermal reaction for 8 hours at 180 ℃, naturally cooling to 25 ℃, collecting insoluble matters, washing three times with acetone and water respectively, drying for 6 hours in a constant-temperature oven at 80 ℃, transferring to a muffle furnace at 550 ℃ for calcining for 2 hours, naturally cooling to 25 ℃, crushing, and sieving with a 325-mesh screen to obtain cobaltosic oxide;
(2) Mixing 3kg of magnesium oxide with 25kg of water, treating for 30min at an ultrasonic power of 50W and a frequency of 40kHz, and stirring for 30min at a stirring rate of 350r/min to form a suspension;
(3) Heating and melting 3.5kg of stearic acid at 80 ℃, adding 1kg of fatty alcohol polyoxyethylene ether AEO-9 and 100kg of water, and stirring for 30min at a stirring rate of 350 r/min; then adding 0.5kg of ammonia water, and continuing stirring to react for 3min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I at a dropwise adding rate of 0.5kg/min, adding 2kg of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30min; naturally cooling to 25 ℃, and adjusting the solid content to 25% by using water to obtain the modifier.
Example 3
A corrosion-resistant cement mortar consists of 20kg of cement, 60kg of river sand, 1kg of modifier and 8.2kg of water.
The preparation method of the modifier comprises the following steps:
(1) Mixing 0.8kg of cobalt nitrate hexahydrate, 0.05kg of 2-mercapto-1-methylimidazole, 25kg of isopropyl alcohol and 5kg of glycerin, and stirring at a stirring rate of 450r/min for 30min to form a solution; transferring the solution to a reaction kettle, carrying out solvothermal reaction for 8 hours at 180 ℃, naturally cooling to 25 ℃, collecting insoluble matters, washing three times with acetone and water respectively, drying for 6 hours in a constant-temperature oven at 80 ℃, transferring to a muffle furnace at 550 ℃ for calcining for 2 hours, naturally cooling to 25 ℃, crushing, and sieving with a 325-mesh screen to obtain cobaltosic oxide;
(2) Mixing 3kg of magnesium oxide with 25kg of water, treating for 30min at an ultrasonic power of 50W and a frequency of 40kHz, and stirring for 30min at a stirring rate of 350r/min to form a suspension;
(3) Heating and melting 3.5kg of stearic acid at 80 ℃, adding 1kg of fatty alcohol polyoxyethylene ether AEO-9 and 100kg of water, and stirring for 30min at a stirring rate of 350 r/min; then adding 0.5kg of ammonia water, and continuing stirring to react for 3min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I at a dropwise adding rate of 0.5kg/min, adding 2kg of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30min; naturally cooling to 25 ℃, and adjusting the solid content to 25% by using water to obtain the modifier.
Example 4
A corrosion-resistant cement mortar consists of 20kg of cement, 60kg of river sand, 4kg of corrosion inhibitor, 1kg of modifier and 8.2kg of water.
The preparation method of the modifier comprises the following steps:
(1) Mixing 0.8kg of cobalt nitrate hexahydrate, 0.05kg of 2-mercapto-1-methylimidazole, 25kg of isopropyl alcohol and 5kg of glycerin, and stirring at a stirring rate of 450r/min for 30min to form a solution; transferring the solution to a reaction kettle, carrying out solvothermal reaction for 8 hours at 180 ℃, naturally cooling to 25 ℃, collecting insoluble matters, washing three times with acetone and water respectively, drying for 6 hours in a constant-temperature oven at 80 ℃, transferring to a muffle furnace at 550 ℃ for calcining for 2 hours, naturally cooling to 25 ℃, crushing, and sieving with a 325-mesh screen to obtain cobaltosic oxide;
(2) Mixing 3kg of magnesium oxide with 25kg of water, treating for 30min at an ultrasonic power of 50W and a frequency of 40kHz, and stirring for 30min at a stirring rate of 350r/min to form a suspension;
(3) Heating and melting 3.5kg of stearic acid at 80 ℃, adding 1kg of fatty alcohol polyoxyethylene ether AEO-9 and 100kg of water, and stirring for 30min at a stirring rate of 350 r/min; then adding 0.5kg of ammonia water, and continuing stirring to react for 3min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I at a dropwise adding rate of 0.5kg/min, adding 2kg of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30min; naturally cooling to 25 ℃, and adjusting the solid content to 25% by using water to obtain the modifier.
The preparation method of the corrosion inhibitor comprises the following steps:
s1, adding 1kg of calcium nitrate tetrahydrate, 0.1kg of ferric nitrate nonahydrate and 0.4kg of aluminum nitrate nonahydrate into 10kg of water to prepare a mixed solution, dripping the mixed solution into 10kg of 0.12mol/L sodium hydroxide aqueous solution, preparing a suspension by magnetic stirring for 20min at a stirring speed of 300r/min at a dripping speed of 3-6L/min, then placing the suspension in a nitrogen environment, magnetically stirring for 24h at 25 ℃, stirring for 600r/min, collecting precipitate, washing with water to be neutral, drying for 12h at 80 ℃, and grinding and sieving with a 500-mesh sieve to obtain mixed fine powder;
s2, dissolving 2kg of polyvinylpyrrolidone in 10kg of water, performing ultrasonic dispersion for 5min, then adding the mixed fine powder prepared in the step S1, and continuing ultrasonic dispersion for 1h to obtain the corrosion inhibitor.
Comparative example 1
A corrosion-resistant cement mortar consists of 20kg of cement, 60kg of river sand, 1kg of modifier and 8.2kg of water.
The modifier is 25wt% magnesium stearate suspension.
Comparative example 2
A corrosion-resistant cement mortar consists of 20kg of cement, 60kg of river sand, 1kg of modifier and 8.2kg of water.
The modifier comprises the following steps:
(1) Mixing 0.8kg of cobalt nitrate hexahydrate, 0.2kg of urea and 30kg of water, and stirring at a stirring rate of 450r/min for 30min to form a solution; transferring the solution to a reaction kettle, carrying out solvothermal reaction for 8 hours at 180 ℃, naturally cooling to 25 ℃, collecting insoluble matters, washing three times with acetone and water respectively, drying for 6 hours in a constant-temperature oven at 80 ℃, transferring to a muffle furnace at 550 ℃ for calcining for 2 hours, naturally cooling to 25 ℃, crushing, and sieving with a 325-mesh screen to obtain cobaltosic oxide;
(2) Mixing 3kg of magnesium oxide with 25kg of water, treating for 30min at an ultrasonic power of 50W and a frequency of 40kHz, and stirring for 30min at a stirring rate of 350r/min to form a suspension;
(3) Heating and melting 3.5kg of stearic acid at 80 ℃, adding 1kg of fatty alcohol polyoxyethylene ether AEO-9 and 100kg of water, and stirring for 30min at a stirring rate of 350 r/min; then adding 0.5kg of ammonia water, and continuing stirring to react for 3min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I at a dropwise adding rate of 0.5kg/min, adding 2kg of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30min; naturally cooling to 25 ℃, and adjusting the solid content to 25% by using water to obtain the modifier.
Test example 1
The compressive strength of 40 mm. Times.40 mm. Times.160 mm cement mortar test pieces was tested with reference to the standard GB/T17671-1999 cement mortar strength test method (ISO method), and the results are shown in Table 1. The composition of the conventional mortar in the table is substantially the same as in example 1, except that no modifier is added.
TABLE 1 Strength test results of Cement mortars
From the results of Table 1, it can be seen that the compressive strength of comparative example 1, in which a magnesium stearate suspension was added as an improver, was rather lowered relative to that of the conventional mortar. This is probably because magnesium stearate has a hydrophobic character, which reduces the interaction of the aggregate and the binder at the interface transition zone to some extent. The compressive strength of example 1, to which the magnesium stearate composite emulsion was added, was slightly higher than that of the conventional mortar, probably because the early magnesium stearate composite emulsion can promote the hydration reaction to proceed without consuming calcium hydroxide, thereby increasing cement hydration products and slightly improving the strength of the cement mortar. In comparative example 2, example 2 and example 3, cobaltosic oxide is added into the magnesium stearate composite emulsion, so that the compressive strength is further improved. This is probably because the tricobalt tetraoxide can be used as an initial template for ettringite formation, so that hydration products are promoted to form a more stable structure, and the tricobalt tetraoxide particles with high mechanical properties can bear part of stress, so that the strength of the mortar test piece is improved. As shown in fig. 1, it can be seen that there is a significant difference in the structures of the tricobalt tetraoxides of comparative example 2, and example 3. The hydrothermally prepared cobaltosic oxide (fig. 1A, example 1) is a lamellar agglomerate-like structure; the tricobalt tetraoxide of example 2 (fig. 1B) takes on a spherical shape; example 3 (fig. 1C) is a sheet with a multilayered structure. The cement mortar of example 3 has the best compressive strength, possibly affected by the tricobalt tetraoxide structure.
Test example 2
The water contact angle of the test piece may reflect the hydrophilicity of the test piece. And wetting water on the surface of the object to be measured, wherein the contact angle is more than 90 degrees and the object to be measured is hydrophobic. The 40mm×40mm×160mm cement mortar test pieces were cut, and the water contact angles of the inner and outer surfaces of the cement mortar were measured, and the results are shown in table 2.
TABLE 2 Water contact angles of inner and outer surfaces of test pieces
| Experimental protocol | Inner surface water contact angle (°) | External surface water contact angle (°) |
| Common mortar | 26 | 35 |
| Example 1 | 83 | 119 |
| Example 2 | 93 | 128 |
| Example 3 | 101 | 134 |
| Example 4 | 98 | 130 |
| Comparative example 1 | 61 | 113 |
| Comparative example 2 | 88 | 123 |
As can be seen from the test results of Table 2, the cement mortar without the modifier has both inner and outer surfaces that are hydrophilic. The addition of magnesium stearate in comparative example 1 can improve the hydrophilicity of the mortar and reverse the wetting of the outer surface. Example 1 with magnesium stearate emulsion the hydrophilicity of the mortar test pieces was further improved, but the interior of the mortar was still hydrophilic. The same is true for comparative example 2. Both the inner and outer surfaces of the mortars of example 2 and example 3 were hydrophobic. This may be related to the structure of the tricobalt tetraoxide. The mortar of comparative example 3 has the best hydrophobicity, probably because the addition of 2-mercapto-1-methylimidazole not only improves the structure of tricobalt tetraoxide, but also enhances its dispersibility in emulsion systems, making the hydrophobic film easier to form.
The water absorption of a 70.7mm×70.7mm×70.7mm mortar sample was tested with reference to standard JC 474-2008 mortar, concrete waterproofing agent. Drying a standard mortar sample and a mortar sample to be tested to constant weight in a constant temperature oven at 80 ℃, and respectively weighing and recording the weight m at the moment t1 And m 1 The method comprises the steps of carrying out a first treatment on the surface of the Then placing the mixture into a tank with two steel bars at the bottom, immersing the standard mortar sample and the mortar sample to be tested into water with the height of 35mm, keeping the water surface constant, taking out the mixture after keeping the mixture in an environment with the temperature of 20 ℃ and the relative humidity of 90% for 48 hours, wiping the water on the surface of the test sample, and respectively weighing and recording the weights m of the standard mortar sample and the mortar sample to be tested t1 And m 2 The method comprises the steps of carrying out a first treatment on the surface of the Calculate the water absorption= (m 2 -m 1 )/(m t2 -m t1 ). The results are shown in Table 3.
Table 3 water absorption results of test pieces
| Experimental protocol | Water uptake (%) |
| Common mortar | 4.5 |
| Example 1 | 2.6 |
| Example 2 | 2.1 |
| Example 3 | 1.8 |
| Example 4 | 1.9 |
| Comparative example 1 | 4.3 |
| Comparative example 2 | 2.4 |
As can be seen from the test results of the above table, the cement mortar test piece prepared in example 3 of the present invention has the lowest water absorption capacity because both the inside and the outside of the mortar are hydrophobic, water drops are repelled on the surface and are difficult to penetrate into pores, and the water absorption capacity is remarkably reduced; the cobaltosic oxide has a certain water-retaining effect, so that the free water content in the new mortar is reduced, micropores and capillary holes in the cement mortar hydration and maintenance processes are further reduced, and the passage way of water in the mortar is reduced.
Test example 3
And (3) testing the chloride ion permeation resistance of a cylindrical cement mortar test piece with the diameter of 100mm and the height of 50mm by adopting a rapid chloride ion migration coefficient method according to the standard GB/T50082-2009 common concrete long-term performance and durability test method standard. The results are shown in Table 4. Lower penetration depth, lower permeability coefficient, represents better resistance to chloride ions.
TABLE 4 results of resistance to penetration of chloride ions of cement mortar test pieces
From the results shown in Table 4, it is possible that the mortar prepared in example 4 of the present invention has the best anti-permeability ability, because polyvinylpyrrolidone is a dispersible surfactant, and can form a protective film on the surface of the metal compound, promote uniform dispersion between the metal compound and cement, avoid particle agglomeration, and improve compactness and impedance of the sample. But also improves the barrier effect on corrosive ions, reduces the migration of corrosive ions, reduces chloride ion diffusion channels, and obviously reduces the permeability coefficient of chloride ions.
Test example 4
The self-shrinkage performance of the mortar test piece is tested by referring to the standard JGJ/T70-2009 building mortar basic performance test method standard. The results are shown in Table 5.
TABLE 5 self-shrinkage results of cement mortars
| Experimental protocol | Self-contraction (mu epsilon) |
| Common mortar | -536 |
| Example 1 | -628 |
| Example 2 | -486 |
| Example 3 | -432 |
| Example 4 | -441 |
| Comparative example 2 | -601 |
From the test results of the above table, it can be seen that the self-shrinkage of the test piece prepared by adding the magnesium stearate emulsion of example 1 is increased, which is probably because the hydrophobicity of the mortar test piece is enhanced, the magnesium stearate promotes hydration reaction, and water is consumed, so that the self-drying effect inside the mortar is more obvious. Comparative example 2 was also added with hydrothermally prepared tricobalt tetroxide, which was probably because the tricobalt tetroxide as an ettringite template refined the pore structure. Example 3, with the addition of the 2-mercapto-1-methylimidazole modified cobaltosic oxide and magnesium stearate emulsion, has the best self-shrinkage performance, probably due to good dispersibility, overall hydrophobicity of the mortar, and a refined pore structure, enhancing capillary pressure and internal stress, thereby significantly improving the self-shrinkage performance of the mortar.
Test example 5
Chemical resistance test
Test reference to the test method of the property of the cement mortar modified by the epoxy resin emulsion (author: xu Kuisheng, chongqing university, 2012), the cement mortar test piece which has reached curing for 28 days is put into an oven at 80 ℃ and dried for two hours. Three etching solutions were prepared, which were 10wt% aqueous sodium sulfate solution, 10wt% aqueous sodium hydroxide solution and 5wt% aqueous sulfuric acid solution, respectively. The test pieces of the embodiment 3 and the embodiment 4 are respectively put into three solutions and water, the temperature is 15-35 ℃ at room temperature, and the humidity is 50-85%. And taking out after soaking for 6 months, and performing a bending test.
Mass loss rate calculation formula:
Δm＝(m 0 -m 1 )/m 0
Δm is the mass loss rate;
m 0 g, drying quality of the test piece which is not subjected to soaking;
m 1 drying the test piece after 6 months of soaking, and g;
by using the anti-bending corrosion resistance coefficient K p Evaluation of Corrosion resistance, K p The calculation formula is as follows for the ratio of the flexural strength of the series of test pieces after corrosion to the flexural strength of the series of test pieces maintained in the same-age water:
K p ＝R p /R 0
K p is an anti-bending corrosion resistance coefficient;
R p the flexural strength of the series of test pieces after corrosion;
R 0 the flexural strength of the series of test pieces is maintained in water.
Examples 3 and 4 three samples were prepared for testing and the test results averaged, see table 6.
TABLE 6 chemical resistance test results
| Experimental protocol | Fracture resistance and corrosion resistance coefficient | Mass loss rate/% |
| Example 3 | 0.81 | 2.85 |
| Example 4 | 0.96 | 2.04 |
From the test results of table 6, it can be seen that the chemical corrosion resistance of example 4 is best, probably because polyvinylpyrrolidone forms an organic passivation film on the surface of the metal compound, which improves the compactness and resistance of the metal compound, promotes the uniform dispersion of the metal compound in the slurry, avoids particle agglomeration, and blocks the transport channel of corrosive ions, so that example 4 added with the corrosion inhibitor has excellent corrosion resistance.
Claims (6)
1. The corrosion-resistant cement mortar is characterized by comprising the following raw materials in parts by weight: 20-50 parts of cement, 60-150 parts of sand, 3-6 parts of corrosion inhibitor, 1-3 parts of modifier and 8-20 parts of water;
the preparation method of the corrosion inhibitor comprises the following steps of:
s1, adding 8-12 parts of calcium nitrate tetrahydrate, 0.5-2 parts of ferric nitrate nonahydrate and 3-5 parts of aluminum nitrate nonahydrate into 80-120 parts of water to prepare a mixed solution, dripping the mixed solution into 80-120 parts of 0.1-0.2 mol/L sodium hydroxide aqueous solution, stirring magnetically for 10-30 min at a stirring speed of 200-400 r/min to prepare a suspension, then placing the suspension in a nitrogen environment, stirring magnetically for 20-30 h at a stirring speed of 500-800 r/min, collecting precipitate, washing with water to neutrality, drying at a temperature of 70-100 ℃ for 10-20 h, and grinding and sieving to obtain mixed fine powder;
s2, dissolving 15-30 parts of polyvinylpyrrolidone in 80-150 parts of water, performing ultrasonic dispersion for 3-10 min, then adding the mixed fine powder prepared in the step S1, and continuing ultrasonic dispersion for 0.5-2 h to obtain the corrosion inhibitor;
the preparation method of the modifier comprises the following steps of:
(1) Mixing 0.5-1 part of cobalt nitrate hexahydrate, 20-30 parts of isopropyl alcohol and 5-10 parts of glycerol, and stirring for 30-60 min to form a solution; carrying out thermal reaction on the solution at 160-180 ℃ for 6-8 hours, naturally cooling, collecting insoluble matters, washing, drying, calcining, crushing and sieving to obtain cobaltosic oxide;
(2) Mixing 3-5 parts of magnesium oxide with 20-30 parts of water, treating for 20-60 min under the ultrasonic power of 50-100W, and then continuously stirring to form suspension;
(3) Heating and melting 20-50 parts of stearic acid at 70-90 ℃, adding 1-3 parts of nonionic surfactant and 100-150 parts of water, and stirring for 30-60 min; then adding 0.3-1 part of ammonia water, and continuing stirring and reacting for 30-60 min to form a system I; dropwise adding the suspension obtained in the step (2) into a continuously stirred system I, adding 1-5 parts of the cobaltosic oxide prepared in the step (1) after complete dropwise adding, and continuously stirring and reacting for 30-60 min; naturally cooling to 20-30 ℃, and regulating the solid content to 20-30% by using water to obtain the modifier.
2. The corrosion-resistant cement mortar of claim 1, wherein said cement is one of portland cement, slag portland cement, fly ash portland cement.
3. The corrosion-resistant cement mortar of claim 1, wherein the sand is common river sand with a particle size of 0.35-0.5 mm.
4. The corrosion-resistant cement mortar according to claim 1, wherein the sieving in the step S1 is performed by using a 400-600 mesh sieve.
5. The corrosion-resistant cement mortar of claim 1, wherein the nonionic surfactant is at least one of fatty alcohol-polyoxyethylene ether O-20, fatty alcohol-polyoxyethylene ether O-25, fatty alcohol-polyoxyethylene ether AEO-9.
6. The method for preparing the corrosion-resistant cement mortar according to any one of claims 1 to 5, comprising the steps of: adding raw materials including cement, sand, corrosion inhibitor, modifier and water in parts by weight into a stirrer, stirring for 1-4 min at a stirring rate of 70-100 r/min, then filling the mixture into a mould, vibrating the mixture for 10-20 s while filling mortar, and scraping the surface of the mould by using a lime cutter after filling; and then placing the mould with the mortar in an environment with the temperature of 18-22 ℃ and the relative humidity of 85-92% for curing, demoulding after 40-50 h, and curing until the curing time is 26-30 days to obtain the corrosion-resistant cement mortar.
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