CN116813281A - High-performance concrete for subway engineering and preparation method thereof - Google Patents
High-performance concrete for subway engineering and preparation method thereof Download PDFInfo
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- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 238000012407 engineering method Methods 0.000 title description 2
- -1 polydimethylsiloxane Polymers 0.000 claims abstract description 118
- 239000000835 fiber Substances 0.000 claims abstract description 89
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 150000001875 compounds Chemical class 0.000 claims abstract description 51
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 239000004567 concrete Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 22
- 239000012783 reinforcing fiber Substances 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 16
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 239000004576 sand Substances 0.000 claims abstract description 15
- 239000004575 stone Substances 0.000 claims abstract description 12
- 239000004205 dimethyl polysiloxane Substances 0.000 claims abstract description 9
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 9
- SMNNDVUKAKPGDD-UHFFFAOYSA-N 2-butylbenzoic acid Chemical compound CCCCC1=CC=CC=C1C(O)=O SMNNDVUKAKPGDD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004115 Sodium Silicate Substances 0.000 claims abstract description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 6
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052911 sodium silicate Inorganic materials 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims description 103
- 239000004743 Polypropylene Substances 0.000 claims description 79
- 229920001155 polypropylene Polymers 0.000 claims description 79
- 238000002156 mixing Methods 0.000 claims description 70
- 238000003756 stirring Methods 0.000 claims description 63
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 40
- 239000000047 product Substances 0.000 claims description 40
- 239000011259 mixed solution Substances 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 33
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 30
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 29
- 229920000570 polyether Polymers 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 25
- 239000000126 substance Substances 0.000 claims description 22
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 20
- LVHBHZANLOWSRM-UHFFFAOYSA-N itaconic acid Chemical compound OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims description 20
- 238000005406 washing Methods 0.000 claims description 20
- 238000004321 preservation Methods 0.000 claims description 18
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000001914 filtration Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 13
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric Acid Chemical compound [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 12
- LMDZBCPBFSXMTL-UHFFFAOYSA-N 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide Chemical compound CCN=C=NCCCN(C)C LMDZBCPBFSXMTL-UHFFFAOYSA-N 0.000 claims description 11
- QTKPMCIBUROOGY-UHFFFAOYSA-N 2,2,2-trifluoroethyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(F)(F)F QTKPMCIBUROOGY-UHFFFAOYSA-N 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 10
- KPYCVQASEGGKEG-UHFFFAOYSA-N 3-hydroxyoxolane-2,5-dione Chemical class OC1CC(=O)OC1=O KPYCVQASEGGKEG-UHFFFAOYSA-N 0.000 claims description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 8
- 239000007795 chemical reaction product Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 8
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 claims description 7
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 7
- 150000004985 diamines Chemical class 0.000 claims description 7
- 229920001223 polyethylene glycol Polymers 0.000 claims description 7
- DFATXMYLKPCSCX-UHFFFAOYSA-N 3-methylsuccinic anhydride Chemical compound CC1CC(=O)OC1=O DFATXMYLKPCSCX-UHFFFAOYSA-N 0.000 claims description 6
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims description 6
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 6
- 239000012965 benzophenone Substances 0.000 claims description 6
- 239000013067 intermediate product Substances 0.000 claims description 6
- 239000011268 mixed slurry Substances 0.000 claims description 6
- 238000006116 polymerization reaction Methods 0.000 claims description 6
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 6
- KDYFGRWQOYBRFD-UHFFFAOYSA-N succinic acid Chemical compound OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 claims description 6
- 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 6
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 5
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 5
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 5
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- QLPMKRZYJPNIRP-UHFFFAOYSA-M methyl(trioctyl)azanium;bromide Chemical compound [Br-].CCCCCCCC[N+](C)(CCCCCCCC)CCCCCCCC QLPMKRZYJPNIRP-UHFFFAOYSA-M 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 239000008096 xylene Substances 0.000 claims description 5
- OYUNTGBISCIYPW-UHFFFAOYSA-N 2-chloroprop-2-enenitrile Chemical compound ClC(=C)C#N OYUNTGBISCIYPW-UHFFFAOYSA-N 0.000 claims description 4
- OHXAOPZTJOUYKM-UHFFFAOYSA-N 3-Chloro-2-methylpropene Chemical compound CC(=C)CCl OHXAOPZTJOUYKM-UHFFFAOYSA-N 0.000 claims description 4
- IWTYTFSSTWXZFU-QPJJXVBHSA-N [(e)-3-chloroprop-1-enyl]benzene Chemical compound ClC\C=C\C1=CC=CC=C1 IWTYTFSSTWXZFU-QPJJXVBHSA-N 0.000 claims description 4
- QVDTXNVYSHVCGW-ONEGZZNKSA-N isopentenol Chemical compound CC(C)\C=C\O QVDTXNVYSHVCGW-ONEGZZNKSA-N 0.000 claims description 4
- BYDRTKVGBRTTIT-UHFFFAOYSA-N 2-methylprop-2-en-1-ol Chemical compound CC(=C)CO BYDRTKVGBRTTIT-UHFFFAOYSA-N 0.000 claims description 3
- 239000010754 BS 2869 Class F Substances 0.000 claims description 3
- 101100310927 Caenorhabditis elegans sra-4 gene Proteins 0.000 claims description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 3
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- STJIISDMSMJQQK-UHFFFAOYSA-N furan-3-ylmethanol Chemical compound OCC=1C=COC=1 STJIISDMSMJQQK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- PCPUMGYALMOCHF-UHFFFAOYSA-N oxolan-3-ylmethanol Chemical compound OCC1CCOC1 PCPUMGYALMOCHF-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000003786 synthesis reaction Methods 0.000 claims description 3
- WVMSIBFANXCZKT-UHFFFAOYSA-N triethyl(hydroxy)silane Chemical compound CC[Si](O)(CC)CC WVMSIBFANXCZKT-UHFFFAOYSA-N 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract description 4
- 230000000087 stabilizing effect Effects 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- 239000013538 functional additive Substances 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
Classifications
-
- 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
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- Polyethers (AREA)
Abstract
The invention relates to the technical field of building materials, in particular to high-performance concrete for subway engineering and a preparation method thereof; the high-performance concrete consists of the following raw materials in parts by weight: 350-380 parts of cement, 720-750 parts of sand, 1030-1070 parts of crushed stone, 100-120 parts of fly ash, 2.0-3.5 parts of polycarboxylate water reducer, 8.5-10 parts of shrinkage reducing agent, 2.5-4 parts of functional auxiliary agent, 10-15 parts of compound excitant, 2.8-4.5 parts of reinforcing fiber, 13-18 parts of carboxyl butylbenzene polymer, 1.8-2.5 parts of polydimethylsiloxane and 170-190 parts of water; wherein the compound excitant consists of triethanolamine and sodium silicate according to the proportion of 1.5-2.0: 1, compounding; the high-performance concrete prepared by the method has higher strength and toughness, and can effectively enhance the capability of the concrete for resisting the slippage of the reinforcing steel bars, so that the fiber and the cement stabilizing material form an integral structure, and the quality of the prepared concrete is further effectively ensured.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to high-performance concrete for subway engineering and a preparation method thereof.
Background
The concrete is a composite material which is formed by configuring gel materials, aggregate and water according to proper proportion and hardening for a certain time, and is a common name of artificial civil construction materials with the largest use amount in the world. The concrete has high hardness, wide raw material sources and low cost, and is widely used for buildings, highways, military projects, nuclear power plants and other structures.
The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased. Meanwhile, the concrete has the characteristics of high compressive strength, good durability, wide strength grade range and the like. The characteristics lead the application range to be very wide, and the concrete is not only used in various civil engineering, namely shipbuilding industry, mechanical industry, ocean development, geothermal engineering and the like, but also is an important material. Such as: concrete is often required in the construction of subway ground links. However, the strength of the concrete currently on the market is relatively insufficient and the toughness is relatively poor, which affects the quality or quality of the concrete to some extent.
Accordingly, the present invention provides a high-performance concrete and a preparation method thereof, so as to solve the above-mentioned related technical problems.
Disclosure of Invention
The invention aims to provide the high-performance concrete for the subway engineering and the preparation method thereof, and the prepared high-performance concrete not only has higher strength and toughness, but also can effectively strengthen the capability of the concrete for resisting the slippage of the reinforcing steel bars, so that the fiber and the cement stabilizing material form an integral structure, and the quality of the prepared concrete is further effectively ensured.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the high-performance concrete for the subway engineering comprises the following raw materials in parts by weight: 350-380 parts of cement, 720-750 parts of sand, 1030-1070 parts of crushed stone, 100-120 parts of fly ash, 2.0-3.5 parts of polycarboxylate water reducer, 8.5-10 parts of shrinkage reducing agent, 2.5-4 parts of functional auxiliary agent, 10-15 parts of compound excitant, 2.8-4.5 parts of reinforcing fiber, 13-18 parts of carboxyl butylbenzene polymer, 1.8-2.5 parts of polydimethylsiloxane and 170-190 parts of water; wherein the compound excitant consists of triethanolamine and sodium silicate according to the proportion of 1.5-2.0: 1 are compounded.
Further, the preparation method of the functional auxiliary agent comprises the following steps:
i, according to 2.5-4: 1: respectively dissolving methylene succinic acid, trifluoroethyl methacrylate and 2-acrylamide-2-methylpropanesulfonic acid in deionized water with the mass being 0.8-1.5 times of the total mass of the methylene succinic acid, the trifluoroethyl methacrylate and the 2-acrylamido-2-methylpropanesulfonic acid in a weight ratio of 0.8-1.2, uniformly mixing and stirring, and then preserving the obtained first mixed solution for later use;
ii, respectively adding 0.7-1.0% of 2, 3-dihydroxysuccinic acid and 0.5-0.7% of sodium hypophosphite into deionized water, uniformly mixing and stirring, and then preserving the obtained second mixed solution for later use;
iii, mixing ether compound with deionized water according to the ratio of 1: adding the mixture into reaction equipment together according to the weight ratio of 0.8-1.2, uniformly mixing and stirring, adding ammonium persulfate with the mass of 2-3.6% of the ether compound into the reaction equipment, then dropwise adding a first mixed solution with the mass of 0.35-0.45 times of the ether compound, a second mixed solution with the mass of 0.9-1.0 times of the ether compound and an intermediate water-phase dispersion with the mass of 0.95-1.05 times of the ether compound into the reaction equipment, and dropwise adding the mixture within 2-3 hours; and after the dripping is finished, reacting for 40-70 min, and after the reaction is finished, regulating the pH value of the mixed material liquid obtained in the reaction equipment to 6.3-6.8, thus obtaining the functional auxiliary agent.
Further, the ether compound is any one of isopentenol polyethylene glycol monomethyl ether and methallyl alcohol polyethylene glycol monomethyl ether, and the weight average molecular weight of the ether compound is 1500-3500.
Further, the preparation method of the intermediate comprises the following steps:
i, polyether compound and methyl succinic anhydride are mixed according to the proportion of 1:1.5 to 2.5, then adding 4-methylbenzenesulfonic acid with the mass of 2 to 4 percent of that of the polyether compound into the reaction equipment, uniformly mixing and stirring, and then carrying out heat preservation reaction for 6 to 10 hours at the temperature of 120 to 150 ℃; after the reaction is finished, adding an alcohol reagent with the molar weight being 0.8-1.2 times that of the polyether compound into the obtained product component, and continuing to perform heat preservation reaction for 2-4 hours; after the reaction is finished, regulating the pH value of the obtained product components to be neutral, removing volatile substances in the product components under reduced pressure, filtering out solid substances in the product components, and recording the obtained product components as a first mixture for storage and standby;
II, adding halogenated compound with the molar weight being 3-8 times that of polyether compound into the first mixture, then adding trioctyl methyl ammonium bromide with the mass being 1.5-3.8% of polyether compound into the first mixture, uniformly mixing and stirring the mixture, and then carrying out heat preservation reaction for 6-12 h at the temperature of 90-130 ℃; after the reaction is finished, removing halogenated compounds and volatile substances in the reaction product under reduced pressure, filtering out solid substances in the reaction product, and finally obtaining the intermediate product.
Further, in the preparation of the polyether compound, the synthesis initiator was dimethyl methanol, the polymerization monomer was 1, 4-epoxybutane, the degree of polymerization was 40, and the number average molecular weight was 2940g/mol.
Further, the cement is 52.5 grade P.O Portland cement; the fly ash is class F class II fly ash, the screen residue of a 45 mu m square hole screen is less than or equal to 25 percent, the loss on ignition is less than or equal to 8 percent, and the water demand ratio is less than or equal to 105 percent; the sand is middle sand with fineness modulus of 2.5-3.0 and mud content less than 1.0%; the particle size range of the crushed stone is 6-15 mm, the continuous grading is carried out, and the mud content is less than 0.5%; the shrinkage reducing agent is SRA-4 type shrinkage reducing agent; the polycarboxylate water reducer is Concrete Power W20 polycarboxylate water reducer.
Further, the alcohol reagent is selected from any one of triethylsilanol, tetrahydro-3-furanmethanol and furan-3-methanol.
Further, the halogenated compound is selected from any one of 3-chloro-1-phenylpropene, methallyl chloride and 2-chloroacrylonitrile.
Further, the method for preparing the reinforcing fiber comprises the following steps:
step one, dipping polypropylene fiber with the length of 6-10 mm and the diameter of 25.7 mu m into acetone for 5-8 hours according to the solid-to-liquid ratio of 0.08-0.12 g/mL, taking out the polypropylene fiber, and washing and drying the polypropylene fiber by deionized water in sequence; then according to 5-8: 1: respectively mixing and stirring xylene, dehydrated malic anhydride and benzophenone uniformly in a weight ratio of 0.08-0.15 to form a mixed solution; then putting the dried polypropylene fiber and the mixed solution into a light-transmitting reaction device according to the solid-liquid ratio of 0.05-0.1 g/mL, soaking for 20-25 h at the temperature of 30-40 ℃, continuously introducing nitrogen into the light-transmitting reaction device for 10-15 min, and reacting for 5-8 h under the condition of ultraviolet irradiation; after the reaction is finished, fishing out the polypropylene fiber, washing the polypropylene fiber by acetone, and drying to obtain the primary modified polypropylene fiber for later use;
step two, putting the primary modified polypropylene fibers into absolute ethyl alcohol according to the solid-to-liquid ratio of 0.05-0.08 g/mL, mixing and stirring uniformly, sequentially adding 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide and tetraethylene diamine which are respectively 0.6-1.0 times of the mass of the primary modified polypropylene fibers into the absolute ethyl alcohol, mechanically stirring uniformly, raising the temperature to 80 ℃, and carrying out reflux reaction for 5-8 hours; taking out the primary modified polypropylene fiber after the reaction is finished, washing with acetone, drying, and preserving the obtained secondary modified polypropylene fiber for later use;
putting the secondary modified polypropylene fiber into DMF according to the solid-liquid ratio of 0.015-0.03 g/mL, then adding 1, 2-ethane dicarboxylic acid which is 15-30 times of the secondary modified polypropylene fiber and 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide which is 2-3 times of the secondary modified polypropylene fiber into DMF respectively, mechanically stirring to completely dissolve the solid raw materials, heating the obtained mixed phase to 100 ℃, preserving the temperature for 4-6 h, filtering the obtained product component after the reaction is finished, washing the product component with acetone and distilled water, and then drying the product component to obtain the reinforced fiber.
A preparation method of high-performance concrete for subway engineering comprises the following steps:
s1, accurately weighing various raw materials required by preparing high-performance concrete according to the formula amount, then adding a polycarboxylate water reducer into one quarter of water, uniformly mixing and stirring, and then storing the obtained first mixed component for later use;
s2, adding the shrinkage reducing agent and the polydimethylsiloxane into one quarter of water, uniformly mixing and stirring, and then preserving the obtained second mixed component for later use;
s3, putting sand, broken stone and reinforcing fiber into mixing equipment together, sequentially putting cement, fly ash and a compound excitant into the mixing equipment after uniformly mixing and stirring, simultaneously pouring the rest half part of water into the mixing equipment, pouring the first mixed component and the rest materials into the mixing equipment after uniformly mixing and stirring, and continuously mixing and stirring for 5-8 min, so as to obtain mixed slurry for later use;
s4, pouring the second mixed component into the mixed slurry obtained in the step S3, mixing and stirring uniformly, discharging, and sequentially carrying out molding and curing treatment on the obtained concrete mixture to obtain the high-performance concrete finished product.
Compared with the prior art, the invention has the beneficial effects that:
1. in the invention, polyether compound, methyl succinic anhydride, 4-methyl benzene sulfonic acid, alcohol reagent, halogenated compound and the like are used as raw materials, and intermediate products are prepared through chemical reaction. And then taking the ammonium persulfate as a raw material for preparing the functional additive, and carrying out chemical reaction on the ammonium persulfate and related substances in the first mixed solution and the second mixed solution under the action of ammonium persulfate to finally prepare the functional additive. The cooperative coordination of the 2, 3-dihydroxysuccinic acid and sodium hypophosphite in the reaction process can effectively control the molecular weight of the functional auxiliary agent and ensure the dispersion performance of the functional auxiliary agent. The use of the functional auxiliary agent can not only effectively reduce the air content in the polycarboxylate water reducer, but also compact the loose structure of the concrete surface, thereby improving the early strength of the concrete to a certain extent, enabling the strength grade to reach C50, and effectively ensuring the quality of the prepared concrete.
2. The invention firstly cleans and dries the polypropylene fiber, then immerses the polypropylene fiber in the mixed solution composed of dimethylbenzene, dehydrated malic anhydride and benzophenone, and makes the dehydrated malic anhydride grafted on the surface of the polypropylene fiber through chemical reaction by ultraviolet irradiation, thereby preparing the primary modified polypropylene fiber. And then, the primary modified polypropylene fiber, 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide, tetraethylene diamine and the like are taken as raw materials, and the tetraethylene diamine and the dehydrated malic anhydride grafted on the surface of the primary modified polypropylene fiber are subjected to chemical reaction through chemical reaction, and are connected through chemical bonds, so that the expansion of molecular chains on the surface of the primary modified polypropylene fiber is realized. Finally, the reinforcing fiber is prepared by the chemical reaction of 1, 2-ethane dicarboxylic acid and the secondary modified polypropylene fiber. The reinforced fiber prepared by the invention can be used as a raw material for preparing high-performance concrete to be combined with polar groups in cement, so that the capability of the concrete for resisting the slippage of reinforcing steel bars is effectively enhanced, and the fiber and the cement stabilizing material form an integral structure. In addition, the use of the reinforcing fiber can play a good role in toughening cement, and the mechanical property of the concrete is further improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The high-performance concrete for the subway engineering consists of the following raw materials in parts by weight: 350 parts of cement, 720 parts of sand, 1030 parts of crushed stone, 100 parts of fly ash, 2.0 parts of polycarboxylate superplasticizer, 8.5 parts of shrinkage reducing agent, 2.5 parts of functional auxiliary agent, 10 parts of compound excitant, 2.8 parts of reinforcing fiber, 13 parts of carboxyl butylbenzene polymer, 1.8 parts of polydimethylsiloxane and 170 parts of water; wherein the compound excitant consists of triethanolamine and sodium silicate according to the proportion of 1.5:1 are compounded.
The preparation method of the functional auxiliary agent comprises the following steps:
i, according to 2.5:1: respectively dissolving methylene succinic acid, trifluoroethyl methacrylate and 2-acrylamide-2-methylpropanesulfonic acid in deionized water with the mass being 0.8 times of the total mass of the methylene succinic acid, the trifluoroethyl methacrylate and the 2-acrylamido-2-methylpropanesulfonic acid in a weight ratio of 0.8, uniformly mixing and stirring, and then preserving the obtained first mixed solution for later use;
ii, respectively adding 0.7% of 2, 3-dihydroxysuccinic acid and 0.5% of sodium hypophosphite into deionized water, uniformly mixing and stirring, and then preserving the obtained second mixed solution for later use;
iii, mixing ether compound with deionized water according to the ratio of 1: adding the mixture into reaction equipment together according to the weight ratio of 0.8, uniformly mixing and stirring, adding ammonium persulfate with the mass of 2% of the ether compound into the reaction equipment, and then dropwise adding a first mixed solution, a second mixed solution and an intermediate aqueous dispersion solution with the mass of 0.35 times of the ether compound, 0.9 times of the second mixed solution and 0.95 times of the intermediate aqueous dispersion solution into the reaction equipment within 2 hours; after the dripping is finished, reacting for 40min, and after the reaction is finished, regulating the pH value of the mixed material liquid obtained in the reaction equipment to 6.3, wherein the finally obtained functional auxiliary agent is obtained; wherein the ether compound is isopentenol polyethylene glycol monomethyl ether, and the weight average molecular weight of the ether compound is 1500.
The preparation method of the intermediate comprises the following steps:
i, polyether compound and methyl succinic anhydride are mixed according to the proportion of 1:1.5, adding the mixture into reaction equipment together, adding 4-methylbenzenesulfonic acid with the mass of 2 percent of the polyether compound into the reaction equipment, uniformly mixing and stirring, and then carrying out heat preservation reaction for 6 hours at 120 ℃; after the reaction is finished, triethylsilanol with the molar weight being 0.8 times that of the polyether compound is added into the obtained product components, and the heat preservation reaction is continued for 2 hours; after the reaction is finished, regulating the pH value of the obtained product components to be neutral, removing volatile substances in the product components under reduced pressure, filtering out solid substances in the product components, and recording the obtained product components as a first mixture for storage and standby;
II, adding 3-chloro-1-phenylpropene with the molar weight being 3 times that of the polyether compound into the first mixture, then adding trioctyl methyl ammonium bromide with the mass being 1.5% of that of the polyether compound into the first mixture, uniformly mixing and stirring the mixture, and then carrying out heat preservation reaction for 6 hours at the temperature of 90 ℃; after the reaction is finished, removing 3-chloro-1-phenylpropene and volatile substances therein under reduced pressure, and filtering out solid substances therein, thus obtaining the intermediate product.
In the preparation of polyether compounds, the synthesis initiator was dimethyl methanol, the polymerization monomer was 1, 4-epoxybutane, the degree of polymerization was 40, and the number average molecular weight was 2940g/mol.
The cement is 52.5-grade P.O ordinary Portland cement; the fly ash is class F class II fly ash, the screen residue of a 45 mu m square hole screen is less than or equal to 25 percent, the loss on ignition is less than or equal to 8 percent, and the water demand ratio is less than or equal to 105 percent; the sand is middle sand with fineness modulus of 2.5-3.0 and mud content less than 1.0%; the particle size range of the crushed stone is 6mm, the continuous grading is carried out, and the mud content is less than 0.5%; the shrinkage reducing agent is SRA-4 type shrinkage reducing agent; the polycarboxylate water reducer is Concrete Power W20 polycarboxylate water reducer.
The preparation method of the reinforcing fiber comprises the following steps:
step one, immersing polypropylene fibers with the length of 6mm and the diameter of 25.7 mu m in acetone according to the solid-to-liquid ratio of 0.08g/mL for 5 hours, taking out the polypropylene fibers, and washing and drying the polypropylene fibers sequentially by deionized water; then according to the following steps of 5:1: mixing and stirring xylene, dehydrated malic anhydride and benzophenone uniformly in a weight ratio of 0.08 to form a mixed solution; then, putting the dried polypropylene fiber and the mixed solution into light-transmitting reaction equipment according to the solid-liquid ratio of 0.05g/mL, soaking for 20 hours at the temperature of 30 ℃, continuously introducing nitrogen into the light-transmitting reaction equipment for 10 minutes, and reacting for 5 hours under the condition of ultraviolet irradiation; after the reaction is finished, fishing out the polypropylene fiber, washing the polypropylene fiber by acetone, and drying to obtain the primary modified polypropylene fiber for later use;
step two, putting the primary modified polypropylene fibers into absolute ethyl alcohol according to the solid-to-liquid ratio of 0.05g/mL, mixing and stirring uniformly, sequentially adding 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide and tetraethylene diamine which are respectively 0.6 times of the mass of the primary modified polypropylene fibers into the absolute ethyl alcohol, mechanically stirring uniformly, raising the temperature to 80 ℃, and carrying out reflux reaction for 5 hours; taking out the primary modified polypropylene fiber after the reaction is finished, washing with acetone, drying, and preserving the obtained secondary modified polypropylene fiber for later use;
putting the secondary modified polypropylene fiber into DMF according to the solid-to-liquid ratio of 0.015g/mL, then adding 1, 2-ethane dicarboxylic acid which is 15 times of the secondary modified polypropylene fiber and 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide which is 2 times of the secondary modified polypropylene fiber into the DMF respectively, mechanically stirring to completely dissolve the solid raw materials in the DMF, then heating the obtained mixed phase to 100 ℃, carrying out heat preservation reaction for 4 hours at the temperature, filtering the obtained product components after the reaction is finished, washing the obtained product components with acetone and distilled water in sequence, and then drying the product components to obtain the reinforced fiber.
The preparation method of the high-performance concrete comprises the following steps:
s1, accurately weighing various raw materials required by preparing high-performance concrete according to the formula amount, then adding a polycarboxylate water reducer into one quarter of water, uniformly mixing and stirring, and then storing the obtained first mixed component for later use;
s2, adding the shrinkage reducing agent and the polydimethylsiloxane into one quarter of water, uniformly mixing and stirring, and then preserving the obtained second mixed component for later use;
s3, putting sand, broken stone and reinforcing fiber into mixing equipment together, sequentially putting cement, fly ash and a compound excitant into the mixing equipment after uniformly mixing and stirring, simultaneously pouring the rest half part of water into the mixing equipment, pouring the first mixed component and the rest materials into the mixing equipment after uniformly mixing and stirring, and continuously mixing and stirring for 5min, so as to obtain mixed slurry for later use;
s4, pouring the second mixed component into the mixed slurry obtained in the step S3, mixing and stirring uniformly, discharging, and sequentially carrying out molding and curing treatment on the obtained concrete mixture to obtain the high-performance concrete finished product.
Example 2
The preparation method of the high-performance concrete for subway engineering in the embodiment is basically the same as that of the embodiment 1, and the difference between the preparation method is that the specific proportion of the raw materials used, the preparation method of the functional auxiliary agent and the reinforcing fiber are different, and the specific proportion of the raw materials used in the embodiment is as follows:
the high-performance concrete consists of the following raw materials in parts by weight: 370 parts of cement, 740 parts of sand, 1050 parts of crushed stone, 110 parts of fly ash, 3.0 parts of polycarboxylate superplasticizer, 9.5 parts of shrinkage reducing agent, 3.5 parts of functional auxiliary agent, 12 parts of compound excitant, 3.6 parts of reinforcing fiber, 15 parts of carboxyl butylbenzene polymer, 2.0 parts of polydimethylsiloxane and 180 parts of water; wherein the compound excitant consists of triethanolamine and sodium silicate according to the proportion of 1.8:1 are compounded.
The preparation method of the functional auxiliary agent comprises the following steps:
i, according to 3:1:1, respectively dissolving methylene succinic acid, trifluoroethyl methacrylate and 2-acrylamide-2-methylpropanesulfonic acid in deionized water with the mass being 1.2 times of the total mass of the methylene succinic acid, the trifluoroethyl methacrylate and the 2-acrylamido-2-methylpropanesulfonic acid, uniformly mixing and stirring, and then preserving the obtained first mixed solution for later use;
ii, respectively adding 0.8% of 2, 3-dihydroxysuccinic acid and 0.6% of sodium hypophosphite into deionized water, uniformly mixing and stirring, and then preserving the obtained second mixed solution for later use;
iii, mixing ether compound with deionized water according to the ratio of 1:1, adding the mixture into reaction equipment together according to the weight ratio, uniformly mixing and stirring, adding ammonium persulfate with the mass of 3.0% of the ether compound into the reaction equipment, and then dropwise adding a first mixed solution, a second mixed solution and an intermediate aqueous dispersion solution with the mass of 0.4 times of the ether compound, 0.95 times of the second mixed solution and 1.02 times of the intermediate aqueous dispersion solution into the reaction equipment within 2.5 hours; after the dripping is finished, reacting for 600min, and after the reaction is finished, regulating the pH value of the mixed material liquid obtained in the reaction equipment to 6.5, wherein the finally obtained functional auxiliary agent is obtained; wherein the ether compound is methallyl alcohol polyethylene glycol monomethyl ether, and the weight average molecular weight of the ether compound is 2500.
The preparation method of the intermediate comprises the following steps:
i, polyether compound and methyl succinic anhydride are mixed according to the proportion of 1:2.0, adding the mixture into reaction equipment together, adding 4-methylbenzenesulfonic acid with the mass of 3% of the polyether compound into the reaction equipment, uniformly mixing and stirring, and then carrying out heat preservation reaction for 8 hours at 130 ℃; after the reaction is finished, adding tetrahydro-3-furanmethanol with the molar weight equal to that of the polyether compound into the obtained product component, and continuing to perform heat preservation reaction for 3 hours; after the reaction is finished, regulating the pH value of the obtained product components to be neutral, removing volatile substances in the product components under reduced pressure, filtering out solid substances in the product components, and recording the obtained product components as a first mixture for storage and standby;
II, adding methallyl chloride with the molar weight being 5 times that of the polyether compound into the first mixture, then adding trioctyl methyl ammonium bromide with the mass being 3.0% of that of the polyether compound into the first mixture, uniformly mixing and stirring the mixture, and then carrying out heat preservation reaction for 9h at the temperature of 110 ℃; after the reaction is finished, removing the methallyl chloride and volatile substances in the reaction product under reduced pressure, filtering out solid substances in the reaction product, and finally obtaining the intermediate product.
The preparation method of the reinforcing fiber comprises the following steps:
step one, immersing polypropylene fibers with the length of 8mm and the diameter of 25.7 mu m in acetone according to the solid-to-liquid ratio of 0.1g/mL for 6 hours, taking out the polypropylene fibers, and washing and drying the polypropylene fibers sequentially by deionized water; then according to 6:1: respectively mixing and stirring xylene, dehydrated malic anhydride and benzophenone uniformly in a weight ratio of 0.12 to form a mixed solution; then, putting the dried polypropylene fiber and the mixed solution into light-transmitting reaction equipment according to the solid-liquid ratio of 0.08g/mL, soaking for 25 hours at the temperature of 35 ℃, continuously introducing nitrogen into the light-transmitting reaction equipment for 12 minutes, and reacting for 6 hours under the condition of ultraviolet irradiation; after the reaction is finished, fishing out the polypropylene fiber, washing the polypropylene fiber by acetone, and drying to obtain the primary modified polypropylene fiber for later use;
step two, putting the primary modified polypropylene fibers into absolute ethyl alcohol according to the solid-to-liquid ratio of 0.06g/mL, mixing and stirring uniformly, sequentially adding 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide with the mass being 0.8 times that of the primary modified polypropylene fibers and tetraethylene diamine with the mass being 8 times that of the primary modified polypropylene fibers, mechanically stirring uniformly, raising the temperature to 80 ℃, and carrying out reflux reaction for 6 hours; taking out the primary modified polypropylene fiber after the reaction is finished, washing with acetone, drying, and preserving the obtained secondary modified polypropylene fiber for later use;
and thirdly, putting the secondary modified polypropylene fiber into DMF according to the solid-to-liquid ratio of 0.025g/mL, then respectively adding 1, 2-ethane dicarboxylic acid and 2.5 times of 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide with the mass being 20 times of that of the secondary modified polypropylene fiber into the DMF, mechanically stirring to completely dissolve the solid raw materials in the DMF, then heating the obtained mixed phase to 100 ℃, carrying out heat preservation reaction for 5 hours at the temperature, filtering the obtained resultant component after the reaction is finished, washing the resultant component with acetone and distilled water in sequence, and then drying the resultant component to obtain the reinforced fiber.
Example 3
The preparation method of the high-performance concrete for subway engineering in the embodiment is basically the same as that of the embodiment 1, and the difference between the preparation method is that the specific proportion of the raw materials used, the preparation method of the functional auxiliary agent and the reinforcing fiber are different, and the specific proportion of the raw materials used in the embodiment is as follows:
the high-performance concrete consists of the following raw materials in parts by weight: 380 parts of cement, 750 parts of sand, 1070 parts of crushed stone, 120 parts of fly ash, 3.5 parts of polycarboxylate superplasticizer, 10 parts of shrinkage reducing agent, 4 parts of functional auxiliary agent, 15 parts of compound excitant, 4.5 parts of reinforcing fiber, 18 parts of carboxyl butylbenzene polymer, 2.5 parts of polydimethylsiloxane and 190 parts of water; wherein the compound excitant consists of triethanolamine and sodium silicate according to the proportion of 2.0:1 are compounded.
The preparation method of the functional auxiliary agent comprises the following steps:
i, according to 4:1:1.2, respectively dissolving methylene succinic acid, trifluoroethyl methacrylate and 2-acrylamide-2-methylpropanesulfonic acid in deionized water with the mass being 1.5 times of the total mass of the methylene succinic acid, the trifluoroethyl methacrylate and the 2-acrylamido-2-methylpropanesulfonic acid, uniformly mixing and stirring, and then preserving the obtained first mixed solution for later use;
ii, respectively adding 1.0% of 2, 3-dihydroxysuccinic acid and 0.7% of sodium hypophosphite into deionized water, uniformly mixing and stirring, and then preserving the obtained second mixed solution for later use;
iii, mixing ether compound with deionized water according to the ratio of 1:1.2, adding the mixture into reaction equipment together in a weight ratio, uniformly mixing and stirring, adding ammonium persulfate with the mass of 3.6% of the ether compound into the reaction equipment, then dropwise adding a first mixed solution with the mass of 0.45 times of the ether compound, a second mixed solution with the mass of 1.0 time and an intermediate aqueous phase dispersion with the mass of 1.05 times of the ether compound into the reaction equipment, and finishing dropwise adding within 3 hours; after the dripping is finished, reacting for 70min, and after the reaction is finished, regulating the pH value of the mixed material liquid obtained in the reaction equipment to 6.8, wherein the finally obtained functional auxiliary agent is obtained; wherein the ether compound is isopentenol polyethylene glycol monomethyl ether, and the weight average molecular weight of the ether compound is 3500.
The preparation method of the intermediate comprises the following steps:
i, polyether compound and methyl succinic anhydride are mixed according to the proportion of 1:2.5, adding the mixture into reaction equipment together according to the molar ratio, adding 4-methylbenzenesulfonic acid with the mass of 4% of the polyether compound into the reaction equipment, uniformly mixing and stirring, and then carrying out heat preservation reaction for 10 hours at 150 ℃; after the reaction is finished, furan-3-methanol with the molar weight 1.2 times that of the polyether compound is added into the obtained product components, and the heat preservation reaction is continued for 4 hours; after the reaction is finished, regulating the pH value of the obtained product components to be neutral, removing volatile substances in the product components under reduced pressure, filtering out solid substances in the product components, and recording the obtained product components as a first mixture for storage and standby;
II, adding 2-chloroacrylonitrile with the molar weight being 8 times that of the polyether compound into the first mixture, then adding trioctyl methyl ammonium bromide with the mass being 3.8% of that of the polyether compound into the first mixture, uniformly mixing and stirring the mixture, and then carrying out heat preservation reaction for 12 hours at the temperature of 130 ℃; after the reaction is finished, removing 2-chloroacrylonitrile and volatile substances in the reaction product under reduced pressure, and filtering out solid substances in the reaction product, thus obtaining an intermediate product.
The preparation method of the reinforcing fiber comprises the following steps:
step one, immersing polypropylene fibers with the length of 10mm and the diameter of 25.7 mu m in acetone for 8 hours according to the solid-to-liquid ratio of 0.12g/mL, taking out the polypropylene fibers, and washing and drying the polypropylene fibers sequentially by deionized water; then according to 8:1: respectively mixing and stirring xylene, dehydrated malic anhydride and benzophenone uniformly in a weight ratio of 0.15 to form a mixed solution; then, putting the dried polypropylene fiber and the mixed solution into light-transmitting reaction equipment according to the solid-liquid ratio of 0.1g/mL, soaking for 25 hours at the temperature of 40 ℃, continuously introducing nitrogen into the light-transmitting reaction equipment for 15 minutes, and reacting for 8 hours under the condition of ultraviolet irradiation; after the reaction is finished, fishing out the polypropylene fiber, washing the polypropylene fiber by acetone, and drying to obtain the primary modified polypropylene fiber for later use;
step two, putting the primary modified polypropylene fibers into absolute ethyl alcohol according to the solid-to-liquid ratio of 0.08g/mL, mixing and stirring uniformly, sequentially adding 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide with the mass 1.0 times that of the primary modified polypropylene fibers and tetraethylene diamine with the mass 9 times that of the primary modified polypropylene fibers, mechanically stirring uniformly, raising the temperature to 80 ℃, and carrying out reflux reaction for 8 hours; taking out the primary modified polypropylene fiber after the reaction is finished, washing with acetone, drying, and preserving the obtained secondary modified polypropylene fiber for later use;
putting the secondary modified polypropylene fiber into DMF according to the solid-to-liquid ratio of 0.03g/mL, then adding 1, 2-ethane dicarboxylic acid which is 30 times of the secondary modified polypropylene fiber and 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide which is 3 times of the secondary modified polypropylene fiber into the DMF respectively, mechanically stirring to completely dissolve the solid raw materials in the DMF, then heating the obtained mixed phase to 100 ℃, carrying out heat preservation reaction for 6 hours at the temperature, filtering the obtained product components after the reaction is finished, washing the obtained product components with acetone and distilled water in sequence, and then drying the product components to obtain the reinforced fiber.
Comparative example 1 differs from example 1 in that: the embodiment does not contain functional auxiliary agents;
comparative example 2 differs from example 1 in that: the present embodiment does not contain reinforcing fibers;
performance test: the relevant properties of the high-performance concrete prepared in the same amount of examples 1 to 3 and comparative examples 1 to 2 were examined, respectively, and the obtained experimental data were recorded in the following table:
as can be seen from comparison and analysis of relevant data in the table, the high-performance concrete prepared by the method not only has higher strength and toughness, but also can effectively enhance the capability of the concrete for resisting the slippage of the reinforcing steel bars, so that the fiber and the cement stabilizing material form an integral structure, and the quality of the prepared concrete is further effectively ensured. Therefore, the high-performance concrete prepared by the method has wider market prospect and is more suitable for popularization.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (10)
1. The high-performance concrete for the subway engineering is characterized by comprising the following raw materials in parts by weight: 350-380 parts of cement, 720-750 parts of sand, 1030-1070 parts of crushed stone, 100-120 parts of fly ash, 2.0-3.5 parts of polycarboxylate water reducer, 8.5-10 parts of shrinkage reducing agent, 2.5-4 parts of functional auxiliary agent, 10-15 parts of compound excitant, 2.8-4.5 parts of reinforcing fiber, 13-18 parts of carboxyl butylbenzene polymer, 1.8-2.5 parts of polydimethylsiloxane and 170-190 parts of water; wherein the compound excitant consists of triethanolamine and sodium silicate according to the proportion of 1.5-2.0: 1 are compounded.
2. The high-performance concrete for subway engineering according to claim 1, wherein the preparation method of the functional auxiliary agent comprises the following steps:
i, according to 2.5-4: 1: respectively dissolving methylene succinic acid, trifluoroethyl methacrylate and 2-acrylamide-2-methylpropanesulfonic acid in deionized water with the mass being 0.8-1.5 times of the total mass of the methylene succinic acid, the trifluoroethyl methacrylate and the 2-acrylamido-2-methylpropanesulfonic acid in a weight ratio of 0.8-1.2, uniformly mixing and stirring, and then preserving the obtained first mixed solution for later use;
ii, respectively adding 0.7-1.0% of 2, 3-dihydroxysuccinic acid and 0.5-0.7% of sodium hypophosphite into deionized water, uniformly mixing and stirring, and then preserving the obtained second mixed solution for later use;
iii, mixing ether compound with deionized water according to the ratio of 1: adding the mixture into reaction equipment together according to the weight ratio of 0.8-1.2, uniformly mixing and stirring, adding ammonium persulfate with the mass of 2-3.6% of the ether compound into the reaction equipment, then dropwise adding a first mixed solution with the mass of 0.35-0.45 times of the ether compound, a second mixed solution with the mass of 0.9-1.0 times of the ether compound and an intermediate water-phase dispersion with the mass of 0.95-1.05 times of the ether compound into the reaction equipment, and dropwise adding the mixture within 2-3 hours; and after the dripping is finished, reacting for 40-70 min, and after the reaction is finished, regulating the pH value of the mixed material liquid obtained in the reaction equipment to 6.3-6.8, thus obtaining the functional auxiliary agent.
3. The high-performance concrete for subway engineering according to claim 2, wherein: the ether compound is any one of isopentenol polyethylene glycol monomethyl ether and methallyl alcohol polyethylene glycol monomethyl ether, and the weight average molecular weight of the ether compound is 1500-3500.
4. The high-performance concrete for subway engineering according to claim 2, wherein the preparation method of the intermediate comprises the following steps:
i, polyether compound and methyl succinic anhydride are mixed according to the proportion of 1:1.5 to 2.5, then adding 4-methylbenzenesulfonic acid with the mass of 2 to 4 percent of that of the polyether compound into the reaction equipment, uniformly mixing and stirring, and then carrying out heat preservation reaction for 6 to 10 hours at the temperature of 120 to 150 ℃; after the reaction is finished, adding an alcohol reagent with the molar weight being 0.8-1.2 times that of the polyether compound into the obtained product component, and continuing to perform heat preservation reaction for 2-4 hours; after the reaction is finished, regulating the pH value of the obtained product components to be neutral, removing volatile substances in the product components under reduced pressure, filtering out solid substances in the product components, and recording the obtained product components as a first mixture for storage and standby;
II, adding halogenated compound with the molar weight being 3-8 times that of polyether compound into the first mixture, then adding trioctyl methyl ammonium bromide with the mass being 1.5-3.8% of polyether compound into the first mixture, uniformly mixing and stirring the mixture, and then carrying out heat preservation reaction for 6-12 h at the temperature of 90-130 ℃; after the reaction is finished, removing halogenated compounds and volatile substances in the reaction product under reduced pressure, filtering out solid substances in the reaction product, and finally obtaining the intermediate product.
5. The high-performance concrete for subway engineering according to claim 4, wherein: in the preparation of polyether compounds, the synthesis initiator was dimethyl methanol, the polymerization monomer was 1, 4-epoxybutane, the degree of polymerization was 40, and the number average molecular weight was 2940g/mol.
6. The high-performance concrete for subway engineering according to claim 1, wherein: the cement is 52.5-grade P.O ordinary Portland cement; the fly ash is class F class II fly ash, the screen residue of a 45 mu m square hole screen is less than or equal to 25 percent, the loss on ignition is less than or equal to 8 percent, and the water demand ratio is less than or equal to 105 percent; the sand is middle sand with fineness modulus of 2.5-3.0 and mud content less than 1.0%; the particle size range of the crushed stone is 6-15 mm, the continuous grading is carried out, and the mud content is less than 0.5%; the shrinkage reducing agent is SRA-4 type shrinkage reducing agent; the polycarboxylate water reducer is Concrete Power W20 polycarboxylate water reducer.
7. The high-performance concrete for subway engineering according to claim 4, wherein: the alcohol reagent is selected from any one of triethylsilanol, tetrahydro-3-furanmethanol and furan-3-methanol.
8. The high-performance concrete for subway engineering according to claim 4, wherein: the halogenated compound is selected from any one of 3-chloro-1-phenylpropene, methallyl chloride and 2-chloroacrylonitrile.
9. The high-performance concrete for subway engineering according to claim 4, wherein the preparation method of the reinforcing fiber comprises the following steps:
step one, dipping polypropylene fiber with the length of 6-10 mm and the diameter of 25.7 mu m into acetone for 5-8 hours according to the solid-to-liquid ratio of 0.08-0.12 g/mL, taking out the polypropylene fiber, and washing and drying the polypropylene fiber by deionized water in sequence; then according to 5-8: 1: respectively mixing and stirring xylene, dehydrated malic anhydride and benzophenone uniformly in a weight ratio of 0.08-0.15 to form a mixed solution; then putting the dried polypropylene fiber and the mixed solution into a light-transmitting reaction device according to the solid-liquid ratio of 0.05-0.1 g/mL, soaking for 20-25 h at the temperature of 30-40 ℃, continuously introducing nitrogen into the light-transmitting reaction device for 10-15 min, and reacting for 5-8 h under the condition of ultraviolet irradiation; after the reaction is finished, fishing out the polypropylene fiber, washing the polypropylene fiber by acetone, and drying to obtain the primary modified polypropylene fiber for later use;
step two, putting the primary modified polypropylene fibers into absolute ethyl alcohol according to the solid-to-liquid ratio of 0.05-0.08 g/mL, mixing and stirring uniformly, sequentially adding 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide and tetraethylene diamine which are respectively 0.6-1.0 times of the mass of the primary modified polypropylene fibers into the absolute ethyl alcohol, mechanically stirring uniformly, raising the temperature to 80 ℃, and carrying out reflux reaction for 5-8 hours; taking out the primary modified polypropylene fiber after the reaction is finished, washing with acetone, drying, and preserving the obtained secondary modified polypropylene fiber for later use;
putting the secondary modified polypropylene fiber into DMF according to the solid-liquid ratio of 0.015-0.03 g/mL, then adding 1, 2-ethane dicarboxylic acid which is 15-30 times of the secondary modified polypropylene fiber and 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide which is 2-3 times of the secondary modified polypropylene fiber into DMF respectively, mechanically stirring to completely dissolve the solid raw materials, heating the obtained mixed phase to 100 ℃, preserving the temperature for 4-6 h, filtering the obtained product component after the reaction is finished, washing the product component with acetone and distilled water, and then drying the product component to obtain the reinforced fiber.
10. The method for preparing high-performance concrete for subway engineering according to any one of claims 1 to 9, comprising the following steps:
s1, accurately weighing various raw materials required by preparing high-performance concrete according to the formula amount, then adding a polycarboxylate water reducer into one quarter of water, uniformly mixing and stirring, and then storing the obtained first mixed component for later use;
s2, adding the shrinkage reducing agent and the polydimethylsiloxane into one quarter of water, uniformly mixing and stirring, and then preserving the obtained second mixed component for later use;
s3, putting sand, broken stone and reinforcing fiber into mixing equipment together, sequentially putting cement, fly ash and a compound excitant into the mixing equipment after uniformly mixing and stirring, simultaneously pouring the rest half part of water into the mixing equipment, pouring the first mixed component and the rest materials into the mixing equipment after uniformly mixing and stirring, and continuously mixing and stirring for 5-8 min, so as to obtain mixed slurry for later use;
s4, pouring the second mixed component into the mixed slurry obtained in the step S3, mixing and stirring uniformly, discharging, and sequentially carrying out molding and curing treatment on the obtained concrete mixture to obtain the high-performance concrete finished product.
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| CN116813281B (en) | 2024-04-12 |
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