CN113716923A - Cement-based grouting material for semi-flexible mixture and preparation method thereof - Google Patents
Cement-based grouting material for semi-flexible mixture and preparation method thereof Download PDFInfo
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- CN113716923A CN113716923A CN202111066183.3A CN202111066183A CN113716923A CN 113716923 A CN113716923 A CN 113716923A CN 202111066183 A CN202111066183 A CN 202111066183A CN 113716923 A CN113716923 A CN 113716923A
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- 239000004568 cement Substances 0.000 title claims abstract description 93
- 239000000463 material Substances 0.000 title claims abstract description 46
- 239000000203 mixture Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000835 fiber Substances 0.000 claims abstract description 58
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000002893 slag Substances 0.000 claims abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000006185 dispersion Substances 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000000654 additive Substances 0.000 claims abstract description 6
- 230000000996 additive effect Effects 0.000 claims abstract description 6
- 239000000126 substance Substances 0.000 claims abstract description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- 239000004115 Sodium Silicate Substances 0.000 claims description 13
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 13
- 239000002202 Polyethylene glycol Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 229920005646 polycarboxylate Polymers 0.000 claims description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 10
- 229910021389 graphene Inorganic materials 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 229920000587 hyperbranched polymer Polymers 0.000 claims description 7
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 claims description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 2
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 claims description 2
- 238000007605 air drying Methods 0.000 claims description 2
- 125000002947 alkylene group Chemical group 0.000 claims description 2
- 235000010323 ascorbic acid Nutrition 0.000 claims description 2
- 229960005070 ascorbic acid Drugs 0.000 claims description 2
- 239000011668 ascorbic acid Substances 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000015271 coagulation Effects 0.000 claims description 2
- 238000005345 coagulation Methods 0.000 claims description 2
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 2
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- 230000004048 modification Effects 0.000 claims description 2
- 238000012986 modification Methods 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract description 10
- 239000007864 aqueous solution Substances 0.000 abstract description 5
- 230000003746 surface roughness Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000001020 plasma etching Methods 0.000 abstract description 3
- 238000002166 wet spinning Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 description 8
- 230000036571 hydration Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000011440 grout Substances 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 125000000129 anionic group Chemical group 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- -1 and generally Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 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
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920005594 polymer fiber Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- 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
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
-
- 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
- C04B12/00—Cements not provided for in groups C04B7/00 - C04B11/00
- C04B12/04—Alkali metal or ammonium silicate cements ; Alkyl silicate cements; Silica sol cements; Soluble silicate 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
-
- 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
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds 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
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
-
- 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
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- 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
-
- 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
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of cement grouting materials, and particularly relates to a cement-based grouting material for a semi-flexible mixture and a preparation method thereof, wherein the cement-based grouting material comprises the following components in parts by weight: 35-50 parts of sulphoaluminate cement, 10-20 parts of slag powder, 10-20 parts of fly ash, 6-7 parts of chemical additive, 0.3-0.4 part of modified graphene fiber and water; the modified graphene fiber is prepared by adopting simple wet spinning and oxygen plasma etching technologies, has excellent flexibility, is well dispersed in an aqueous solution, and has high surface roughness and tensile strength. The obtained modified graphene fiber is incorporated into a sulphoaluminate cement-based grouting material, so that the mechanical property and the electrical property of the synthesized composite material are obviously improved, and the dispersion property of the composite material in a cement system can be obviously improved through a chemically modified water reducing agent.
Description
Technical Field
The invention belongs to the technical field of cement grouting materials, and particularly relates to a cement-based grouting material for a semi-flexible mixture and a preparation method thereof.
Background
Among various grouting materials, cement, particularly, sulphoaluminate cement, has attracted great research interest as an efficient reinforcing material and is considered one of the most promising candidates due to its high compressive strength, excellent flame retardancy, outstanding durability and stability. However, cement-based grouting materials generally have the characteristics of low tensile strength, poor fracture toughness and impact resistance, and poor electrical conductivity due to their inherent quasi-brittleness, which together hinder their practical application.
Fiber reinforcement can be an effective strategy for improving the performance of cement-based grouting materials. Various materials having fiber morphology have been incorporated into cement to improve the overall performance of mixed fiber-cement composites, such as steel fibers, polymer fibers and carbon fibers, and chinese patent application No. CN108546036A discloses a chrome-containing leather crumb modified construction cement grout material, in which a portion of the fiber mixture is added to the raw material, wherein the fiber mixture is glass fibers, steel fibers, carbon fibers, and generally, steel fiber reinforced cement-based composites are prepared by uniformly adding high modulus, high strength and high ductility steel fibers to the cement matrix, effectively improving the ductility and conductivity of the resulting composite. However, steel fibers are not corrosion resistant and the interfacial bonding between the fibers and the cement matrix is poor and does not meet the requirements of industrial practice.
Disclosure of Invention
The invention aims to provide a cement-based grouting material for a semi-flexible mixture and a preparation method thereof, wherein the modified graphene fiber has excellent flexibility, good dispersion in an aqueous solution, and high surface roughness and tensile strength; the obtained modified graphene fiber is doped into a sulphoaluminate cement-based grouting material, so that the mechanical property and the electrical property of the synthesized composite material are obviously improved, and the dispersing property of the composite material in a cement system can be obviously improved through a chemically modified water reducing agent.
The technical purpose of the invention is realized by the following technical scheme: a cement-based grouting material for semi-flexible mixture comprises the following components in parts by weight: 35-50 parts of sulphoaluminate cement, 10-20 parts of slag powder, 10-20 parts of fly ash, 5-7 parts of chemical additive, 0.3-0.4 part of modified graphene fiber and water.
The invention is further provided with: the chemical additive comprises polyethylene glycol, a modified polycarboxylate water reducing agent and sodium silicate.
The invention is further provided with: the stoichiometric ratio of the polyethylene glycol to the modified polycarboxylate water reducing agent to the sodium silicate is 4-5:1: 1.
The invention is further provided with: the modified graphene fiber is prepared by the following steps: (1) in a rotating coagulation bath of 15-25mg/mL of graphene dispersion liquid and an ethanol-water solution containing 1 wt% of calcium chloride, obtaining a synthesized graphene oxide fiber after 20 min; (2) immersing the graphene oxide fibers obtained in the step (1) into 40-50% of iodine-hydrogen acid, reacting for 5-6h at 90 ℃, and cleaning and air-drying with an ethanol solution after the reaction is finished to obtain graphene fibers; (3) and performing functional modification on the graphene fiber by adopting oxygen plasma to obtain the modified graphene fiber.
The invention is further provided with: the modified graphene fibers are all 2-3 mm.
The invention is further provided with: the modified polycarboxylate water reducer is prepared by the following steps: 4-5% of terminal alkylene polyoxyethylene ether; 6-7% of methacrylic acid; 2-3% maleic anhydride; 0.5-1% of hydroxyl-terminated hyperbranched polymer; 1-2% of hydrogen peroxide and sodium bisulfite; 2-3% mercaptopropionic acid; 0.5-1% ascorbic acid; 2-4% of 2-acrylamide-2-methyl propyl sodium sulfonate and water are sequentially added into a reactor for mixing, the reaction time is 3 hours, and after the reaction is finished, the pH value is adjusted to 6-8 by sodium hydroxide, so that the modified polycarboxylate water reducer is obtained.
The invention is further provided with: the hydroxyl-terminated hyperbranched polymer is prepared by the following method: under the protection of nitrogen, 0.1mol of diethanolamine and 10ml of methanol are mixed and stirred for 30min, then 0.1mol of methyl acrylate is dripped, and the temperature is raised to 35 ℃ for reaction for 5 hours; finally, removing the solvent methanol by a rotary evaporator under the conditions of 60 ℃ and 60r/min, stirring and dissolving the methanol, 0.03mol of trimethylolpropane and 0.1g of p-toluenesulfonic acid, and reacting for 4 hours at the temperature of 120 ℃; and after the reaction is finished and the reactant is cooled, removing the methanol generated in the reaction by using the rotary evaporator again to obtain the hydroxyl-terminated hyperbranched polymer.
A preparation method of a cement-based grouting material for semi-flexible mixture comprises the following preparation steps:
s1: adding the modified graphene fiber into a mixture of the slag powder and the fly ash, and mixing through a high-speed ball mill to obtain a mixture;
s2: mixing the mixture obtained in the step S1 with sulphoaluminate cement and water, stirring and mixing for 5min by using a stirrer to obtain cement grouting, adding polyethylene glycol, and continuously stirring for 5min to form cement grouting suspension;
s3: adding sodium silicate and a modified polycarboxylic acid water reducing agent into the grouting suspension obtained in the step S2, and continuously stirring for 10min to form the cement-based grouting material, wherein the grouting material has the beneficial effects that: .
1. The surface of the modified graphene fiber prepared by the method has some oxygen-containing groups, such as-OH, -COOH, -O-, ═ O and the like, so that the modified graphene fiber has good hydrophilicity and can be well dispersed in an aqueous solution, and the modified graphene fiber is favorable for dispersion when being mixed with cement and interaction with a cement interface; meanwhile, the modified graphene fiber can be bent under a dry condition, is not obviously broken, has excellent flexibility and high torsion resistance compared with common carbon fiber, and is favorable for improving mechanical properties when used as a cement additive; in addition, the surface of the modified graphene fiber has huge directional folds and high roughness, so that the contact area of the modified graphene fiber and the interface of cement can be greatly increased, and the modified graphene fiber can be effectively anchored on a cement matrix. .
2. The components of the invention and other components all show good synergistic effect, and the polyethylene glycol particles are uniformly dispersed in the cement paste phase after being mixed with the grouting. The polyethylene glycol can absorb most of free water, promote the early hydration of cement and increase the hydration degree. Finally, cement hydration products tightly packed on polyethylene glycol molecular chains are combined together to form an integral network, so that the strength characteristic of the cement grouting is obviously improved. When the sodium silicate and the modified polycarboxylate water reducing agent are mixed with the cement grouting, the cement particles, the sodium silicate and the modified polycarboxylate water reducing agent immediately react with water after contacting with each other. Sodium silicate can provide sufficient Na2O·nSiO2Can react with calcium hydroxide in the mixture to form C-S-H gel. At the same time, the reaction will produce a certain amount of sodium hydroxide, thereby increasing the pH of the mixture. Under the action of an alkaline environment, the hydration of calcium silicate is accelerated. Thus, the reaction rate can be controlled by varying the amount of sodium silicate used. The resulting effect on macroscopic properties is reflected in the changes in rheological properties and gel time. When the modified polycarboxylate water reducing agent is added to the mixture, a dispersing effect is generated among cement particles. When the modified polycarboxylate water reducing agent is added into the mixture, a large number of anionic groups are generated, and the adsorption of the anionic groups on the surface of cement particles and the formation of electrostatic and/or space repulsive force are key reasons of the dispersion effectThereby remarkably improving fluidity.
3. In the process of preparing the hydroxyl-terminated hyperbranched polymer, a special Y-type macromonomer is synthesized simultaneously, and the special Y-type structure of the macromonomer can increase the steric hindrance between polycarboxylic acid side chains, so that the tail ends of the side chains are in a stretching state, and the adsorption thickness of the polycarboxylic acid water reducing agent synthesized by the macromonomer on cement particles is improved, thereby improving the dispersibility of the polycarboxylic acid water reducing agent in a cement system.
Detailed Description
The technical solutions in the examples will be clearly and completely described below. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The modified graphene fiber and the cement matrix are tightly combined to form a complete whole without any obvious gap, some tiny cement hydration products are attached to the surface of the modified graphene fiber, and the modified graphene fiber and the cement matrix are good in compatibility and strong in interface connection, so that the high mechanical strength of the cement-based grouting material is realized.
These hydrophilic oxygen-containing groups of the modified graphene fiber surface can enhance the surface energy and wettability, so that the modified graphene fiber surface has good interfacial adhesion with cement hydration products through hydrogen bonds and ionic bonds. Therefore, the uniform distribution of the fibers in the cement matrix and the strong interfacial interaction play an important role in improving the mechanical properties of the cement-based grouting material.
In conclusion, the modified graphene fiber is prepared by adopting simple wet spinning and oxygen plasma etching technologies, has excellent flexibility, is well dispersed in an aqueous solution, and has high surface roughness and tensile strength. The obtained modified graphene fiber is incorporated into a sulphoaluminate cement-based grouting material, so that the mechanical property and the electrical property of the synthesized composite material are obviously improved.
Compared with the influence of the addition of 0-0.3 part of modified graphene fiber on the mechanical property of the cement-based grouting material (on the third day), the cement-based grouting material provided by the invention has the following characteristics as shown in table 1:
table 1 change of compression and bending strength with addition amount of modified graphene
| Addition amount (parts) of modified graphene fiber | 0 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 |
| Compressive strength (MPa) | 2.7 | 2.9 | 3.5 | 3.7 | 3.6 | 3.5 |
| Bending strength (MPa) | 16.5 | 17.5 | 18 | 18.7 | 16.9 | 17.2 |
As shown in table 1, the compressive strength and the flexural strength were gradually improved as the addition amount of the modified graphene fiber was increased, and both the compressive strength and the flexural strength were highest when the addition amount of the modified graphene was 0.3 parts.
Example 1
A preparation method of a cement-based grouting material for semi-flexible mixture comprises the following preparation steps:
s1: adding 0.3 part of modified graphene fiber into a mixture of 10 parts of slag powder and 20 parts of fly ash, and mixing through a high-speed ball mill to obtain a mixture;
s2: mixing the mixture obtained in the step S1 with 35 parts of sulphoaluminate cement and water, stirring and mixing for 5min by using a stirrer to obtain cement grouting, adding 4 parts of polyethylene glycol, and continuously stirring for 5min to form cement grouting suspension;
s3: and (4) adding 1 part of sodium silicate and 1 part of modified polycarboxylic acid water reducing agent into the grouting suspension obtained in the step (S2), and continuously stirring for 10min to obtain the cement-based grouting material.
Example 2
A preparation method of a cement-based grouting material for semi-flexible mixture comprises the following preparation steps:
s1: adding 0.4 part of modified graphene fiber into a mixture of 20 parts of slag powder and 100 parts of fly ash, and mixing through a high-speed ball mill to obtain a mixture;
s2: mixing the mixture obtained in the step S1 with 40 parts of sulphoaluminate cement and water, stirring and mixing for 5min by using a stirrer to obtain cement grouting, adding 5 parts of polyethylene glycol, and continuously stirring for 5min to form cement grouting suspension;
s3: and (4) adding 1 part of sodium silicate and 1 part of modified polycarboxylic acid water reducing agent into the grouting suspension obtained in the step (S2), and continuously stirring for 10min to obtain the cement-based grouting material.
Comparative example 1
A preparation method of a cement-based grouting material for semi-flexible mixture comprises the following preparation steps:
s1: mixing 40 parts of sulphoaluminate, 10 parts of slag powder, 20 parts of fly ash and water, stirring and mixing for 5min by using a stirrer to obtain cement grout, adding 4 parts of polyethylene glycol, and continuously stirring for 5min to form cement grout suspension;
s2: and (4) adding 1 part of sodium silicate and 1 part of modified polycarboxylic acid water reducing agent into the grouting suspension obtained in the step (S1), and continuously stirring for 10min to obtain the cement-based grouting material.
Table 2 semi-flexible cement grout each performance test table in example 1, example 2 and comparative example 1
The modified graphene fiber and the cement matrix are tightly combined to form a complete whole without any obvious gap, a few micro cement hydration products are attached to the surface of the modified graphene fiber, and the modified graphene fiber and the cement matrix are in good compatibility and strong interface connection, so that the grouting rate of the residual porosity is improved, and the high mechanical strength of the cement-based grouting material is realized.
Under the condition of 60 ℃, according to the rutting test results, the rutting deformation amount in the example 1 and the example 2 is obviously smaller than that in the comparative example 1, which shows that the cement grouting material of the invention has better high temperature resistance.
The shrinkage of the semi-flexible cement grouting material is mainly caused by the shrinkage of the cement grouting material, the shrinkage rate in the comparative example 1 is lower because the modified water reducing agent greatly reduces the shrinkage of cement mortar, and the examples 1-2 and the comparative example 1 show that the cement grouting material has a remarkable effect of inhibiting the shrinkage of the semi-flexible material.
In conclusion, the modified graphene fiber is prepared by adopting simple wet spinning and oxygen plasma etching technologies, has excellent flexibility, is well dispersed in an aqueous solution, and has high surface roughness and tensile strength. The obtained modified graphene fiber is incorporated into a sulphoaluminate cement-based grouting material, so that the mechanical property and the electrical property of the synthesized composite material are obviously improved, and the dispersion property of the composite material in a cement system can be obviously improved through a chemically modified water reducing agent.
Claims (8)
1. The cement-based grouting material for the semi-flexible mixture is characterized in that: the composition comprises the following components in parts by weight: 35-50 parts of sulphoaluminate cement, 10-20 parts of slag powder, 10-20 parts of fly ash, 6-7 parts of chemical additive, 0.3-0.4 part of modified graphene fiber and water.
2. The cement-based grouting material for semi-flexible mixture according to claim 1, wherein: the chemical additive comprises polyethylene glycol, a modified polycarboxylate water reducing agent and sodium silicate.
3. The cement-based grouting material for semi-flexible mixture as claimed in claim 2, wherein: the stoichiometric ratio of the polyethylene glycol to the modified polycarboxylate water reducing agent to the sodium silicate is 4-5:1: 1.
4. The cement-based grouting material for semi-flexible mixture according to claim 1, wherein: the modified graphene fiber is prepared by the following steps: (1) in a rotating coagulation bath of 15-25mg/mL of graphene dispersion liquid and an ethanol-water solution containing 1 wt% of calcium chloride, obtaining a synthesized graphene oxide fiber after 20 min; (2) immersing the graphene oxide fibers obtained in the step (1) into 40-50% of iodine-hydrogen acid, reacting for 5-6h at 90 ℃, and cleaning and air-drying with an ethanol solution after the reaction is finished to obtain graphene fibers; (3) and (3) carrying out functional modification on the graphene fiber obtained in the step (2) by adopting oxygen plasma to obtain the modified graphene fiber.
5. The cement-based grouting material for semi-flexible mixture as claimed in claim 4, wherein: the length of the modified graphene fiber is 2-3 mm.
6. The cement-based grouting material for semi-flexible mixture as claimed in claim 2, wherein: the modified polycarboxylate water reducer is prepared by the following steps: 4-5% of terminal alkylene polyoxyethylene ether; 6-7% of methacrylic acid; 2-3% maleic anhydride; 0.5-1% of hydroxyl-terminated hyperbranched polymer; 1-2% of hydrogen peroxide and sodium bisulfite; 2-3% mercaptopropionic acid; 0.5-1% ascorbic acid; 2-4% of 2-acrylamide-2-methyl propyl sodium sulfonate and water are sequentially added into a reactor for mixing, the reaction time is 3 hours, and after the reaction is finished, the pH value is adjusted to 6-8 by sodium hydroxide, so that the modified polycarboxylate water reducer is obtained.
7. The cement-based grouting material for semi-flexible mixture as claimed in claim 6, wherein: the hydroxyl-terminated hyperbranched polymer is prepared by the following method: under the protection of nitrogen, 0.1mol of diethanolamine and 10ml of methanol are mixed and stirred for 30min, then 0.1mol of methyl acrylate is dripped, and the temperature is raised to 35 ℃ for reaction for 5 hours; finally, removing the solvent methanol by a rotary evaporator under the conditions of 60 ℃ and 60r/min, stirring and dissolving the methanol, 0.03mol of trimethylolpropane and 0.1g of p-toluenesulfonic acid, and reacting for 4 hours at the temperature of 120 ℃; and after the reaction is finished and the reactant is cooled, removing the methanol generated in the reaction by using the rotary evaporator again to obtain the hydroxyl-terminated hyperbranched polymer.
8. A preparation method of a cement-based grouting material for semi-flexible mixture is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
s1: adding the modified graphene fiber into a mixture of the slag powder and the fly ash, and mixing through a high-speed ball mill to obtain a mixture;
s2: mixing the mixture obtained in the step S1 with sulphoaluminate cement and water, stirring and mixing for 5min by using a stirrer to obtain cement grouting, adding polyethylene glycol, and continuously stirring for 5min to form cement grouting suspension;
s3: and adding sodium silicate and the modified polycarboxylic acid water reducing agent into the grouting suspension obtained in the step S2, and continuously stirring for 10min to form the cement-based grouting material.
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