CN116589252A - Composite efficient water-reducing concrete and preparation method thereof - Google Patents
Composite efficient water-reducing concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 63
- 239000004568 cement Substances 0.000 claims abstract description 48
- 239000004575 stone Substances 0.000 claims abstract description 28
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 26
- 229920000642 polymer Polymers 0.000 claims abstract description 23
- 239000004576 sand Substances 0.000 claims abstract description 18
- KDXKERNSBIXSRK-UHFFFAOYSA-N lysine Chemical compound NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 claims abstract description 14
- MGNCLNQXLYJVJD-UHFFFAOYSA-N cyanuric chloride Chemical compound ClC1=NC(Cl)=NC(Cl)=N1 MGNCLNQXLYJVJD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 24
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000004579 marble Substances 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 6
- 239000008030 superplasticizer Substances 0.000 description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000000536 complexating effect Effects 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011374 ultra-high-performance concrete Substances 0.000 description 2
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical compound O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- WSNSMPZJJIYZCV-UHFFFAOYSA-N [Na]C Chemical compound [Na]C WSNSMPZJJIYZCV-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000012986 chain transfer agent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- XTBMQKZEIICCCS-UHFFFAOYSA-N hexane-1,5-diamine Chemical compound CC(N)CCCCN XTBMQKZEIICCCS-UHFFFAOYSA-N 0.000 description 1
- 229920000587 hyperbranched polymer Polymers 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyoxyethylene chain Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000003335 steric effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 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
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/002—Dendritic macromolecules
- C08G83/005—Hyperbranched macromolecules
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of building materials, and provides a composite efficient water-reducing concrete and a preparation method thereof. The concrete comprises 300-310 parts by weight of cement, 850-860 parts by weight of sand, 210-220 parts by weight of small stone, 770-780 parts by weight of large stone, 160-180 parts by weight of water and 0.3-0.5% of composite high-efficiency water reducer by weight of cement. The composite high-efficiency water reducer is a mixture of hyperbranched triazine polymer and polycarboxylate water reducer. The hyperbranched triazine polymer is prepared by three-stage reaction of cyanuric chloride and 2, 6-diaminocaproic acid. The hyperbranched triazine polymer and the polycarboxylate water reducer are compounded, so that the water reducing rate and the slump retention rate of concrete can be obviously improved.
Description
Technical Field
The invention relates to the technical field of building materials, and provides a composite efficient water-reducing concrete and a preparation method thereof.
Background
The concrete is prepared by mainly taking cement as a cementing material, taking sand and stone as aggregate, and adding water for mixing. With the increasing level of development of the construction industry, more and more additives are used in concrete. Among concrete admixtures, the water reducing agent is most widely used, and has the effects of improving the rheological property of the concrete admixture, reducing water and improving the temperature under the condition of basically the same slump and not affecting the workability, and simultaneously saving the cement consumption.
The development of the concrete water reducer goes through the three generations of processes, wherein the first generation is lignin sulfonate water reducer, the second generation is naphthalene water reducer and melamine water reducer, and the third generation is polycarboxylate water reducer. Currently, polycarboxylic acid water reducers are widely used, and mainly comprise two types: the polyether with acrylic acid or methacrylic acid as main chain and grafted with different side chain lengths; the other is to graft polyether with maleic anhydride as main chain and different side chain lengths.
The invention Chinese patent (application No. 200710037451.2) discloses a polycarboxylic acid concrete high-efficiency water reducing agent and a synthesis method thereof, wherein (methyl) acrylic acid and polyethylene glycol monomethyl ether are used for synthesizing polyethylene glycol methyl methacrylate (MPEGMA) macromolecular monomers, under the action of an initiator and a chain transfer agent, the MPEGMA macromolecular monomers are subjected to graft copolymerization with other (methyl) acrylic acid or (methyl) sodium allylsulfonate monomers to synthesize a copolymer containing carboxyl, sulfonic groups and polyoxyethylene chain side chains, and the prepared product has the characteristics of high water reducing rate, low chlorine and low alkali, and when the cementing material is added in an amount of 0.7-1.2wt%, the cement mixture has high fluidity and good workability, and can effectively inhibit slump loss. In the invention, when the mixing amount of the water reducer is 1% of the mass of cement, the water reducing rate can reach more than 25%.
The Chinese patent (application number: 202010854858. X) discloses a low-water-gel-ratio ultra-high-performance concrete and a preparation method thereof, wherein the low-water-gel-ratio ultra-high-performance concrete comprises cement, silica fume, fly ash, mineral powder, sand, steel fiber, an additive and water, and the weight ratio of the cement, the silica fume, the fly ash, the mineral powder, the sand, the steel fiber, the additive and the water is 500:20-200:20-70:200-400:600-1300:150-400:15-45:18-120; the additive comprises the following components in percentage by weight: 0.05-0.12:30-60 parts of polycarboxylate water reducer, defoamer and water; the polycarboxylate water reducer at least meets the following conditions: the water reducing rate is not lower than 30%, and the solid content is not lower than 40%.
Disclosure of Invention
The invention provides a composite high-efficiency water-reducing concrete and a preparation method thereof.
In order to achieve the above purpose, the specific technical scheme related to the invention is as follows:
the invention provides a composite efficient water-reducing concrete, which comprises cement, sand, small stone, large stone, water and a composite efficient water reducer.
The concrete comprises the following components in parts by weight: 300-310 parts by weight, 850-860 parts by weight, 210-220 parts by weight, 770-780 parts by weight and 160-180 parts by weight. The dosage of the composite high-efficiency water reducer is 0.3 to 0.5 percent of the weight of the cement by taking the weight of the cement as a reference.
Preferably, the cement is p.c42.5 portland cement; the grain diameter of the sand is 0.3-0.5mm; the particle size of the small stone is 5-10mm; the particle size of the marble is 15-30mm.
The composite high-efficiency water reducer is a mixture of hyperbranched triazine polymer and polycarboxylate water reducer. In the mixture, the weight ratio of the hyperbranched triazine polymer to the polycarboxylate water reducer is 1-3:7-9.
The hyperbranched triazine polymer is prepared by the following steps:
(1) Adding cyanuric chloride into acetone/water to obtain a solution a; adding 2, 6-diaminocaproic acid into water, adding sodium carbonate, and stirring for 5-10min to obtain a solution b; taking sodium hydroxide solution as solution c; the molar ratio of the 2, 6-diaminocaproic acid to the sodium carbonate is 2:1, a step of; the mole ratio of the cyanuric chloride to the 2, 6-diaminocaproic acid to the sodium hydroxide is 2:3.03-3.06:6, preparing a base material;
(2) Cooling the solution a and maintaining the temperature within the range of 0-5 ℃, dropwise adding the 1/3 solution b and the 1/3 solution c within 2 hours, and continuing to react for 1.5-2.5 hours;
(3) Heating and maintaining the temperature within 48-52 ℃, dropwise adding 1/3 solution b and 1/3 solution c within 2 hours, and continuing to react for 1.5-2.5 hours;
(4) Evaporating acetone, heating and maintaining the temperature within 88-92 ℃, dropwise adding 1/3 solution b and 1/3 solution c within 2 hours, and continuing to react for 6-9 hours;
(5) And regulating the pH value to 6-7, cooling, filtering, washing and drying to obtain the hyperbranched triazine polymer.
Preferably, the concentration of cyanuric chloride in the solution a is 0.8-1mol/L.
Preferably, in the solution a, the volume ratio of acetone to water is 5:2-3.
Preferably, in the solution b, the concentration of the 2, 6-diaminohexane is 0.4-0.6mol/L.
Preferably, the concentration of the sodium hydroxide solution is 0.8-1mol/L.
The invention also provides a preparation method of the composite efficient water-reducing concrete, cement, sand, small stone, large stone, water and the composite efficient water reducer are added into a concrete mixer, and the concrete mixer is uniformly mixed.
It is known that after cement is stirred with water, cement particles attract each other to form a flocculating structure, and part of the mixed water is wrapped between the cement particles by the flocculating structure, so that the wrapped water molecules cannot flow freely, and the fluidity of the slurry is affected. The polycarboxylate water reducer plays a role in reducing water for three reasons: firstly, dispersing action, namely-COO on short side chains of polycarboxylate water reducer - 、-SO 3 - Ca on the surface of cement particles 2+ Forming a complex to be adsorbed on the surfaces of cement particles, and promoting the mutual dispersion of the cement particles through electrostatic repulsion, so that a flocculation structure is destroyed, and the wrapped water molecules are released, thereby improving the fluidity of the concrete mixture; secondly, the long side chain of the polycarboxylate water reducer can be stretched in the aqueous solution to form larger steric hindrance among cement particles, so that the agglomeration among the cement particles is hindered, and the slump of the concrete is kept good; and thirdly, the lubricating effect is achieved, the polarity of hydrophilic groups in the polycarboxylate water reducer is very strong, water molecules can be adsorbed on the surfaces of cement particles to form a layer of solvated water film, the sliding resistance among the cement particles is effectively reduced, and the fluidity of the concrete mixture is further improved.
On the basis of adopting the polycarboxylate water reducer, the invention creatively adopts hyperbranched triazine polymer and the polycarboxylate water reducer to compound, prepares the composite high-efficiency water reducer, and adds the composite high-efficiency water reducer into a concrete formula to prepare the water-reducing type concrete. The hyperbranched triazine polymer is prepared by three-stage reaction (low-temperature condensation, medium-temperature condensation and high-temperature condensation) of cyanuric chloride and 2, 6-diaminocaproic acid (sodium salt is prepared by adding sodium carbonate). The hyperbranched polymer has a hyperbranched structure, NH-is directly connected with triazine rings, and a connecting section between the triazine rings contains COO - A pendant group. First, the side group of the connecting segment-COO - Ca on the surface of cement particles 2+ Complex adsorption, analogous to-COO of polycarboxylate water reducers - As such, it can act to promote the dispersion of cement particles by electrostatic repulsion; secondly, -NH-is an electron-pushing group and is connected with a triazine ring to form an electron-donating conjugated effect, so that the electron cloud density of the cyclic structure is increased, and Ca on the surface of cement particles is facilitated 2+ Complexing to further improve the dispersion effect on cement particles; thirdly, compared with the long side chain of the polycarboxylate superplasticizer, the hyperbranched triazine polymer can exert more remarkable steric hindrance effect through the hyperbranched structure of the hyperbranched triazine polymer, and can block the agglomeration of cement particles to a greater extent, so that the slump retention is more facilitated. That is, the hyperbranched triazine polymer can pass not only-COO - With Ca 2+ Complexing with Ca through conjugated cyclic structure 2+ Complexing and has more obvious steric effect than the long side chain of the polycarboxylate water reducer.
From the above, the invention has the beneficial effects that: the composite high-efficiency water reducer composed of hyperbranched triazine polymer prepared by the reaction of cyanuric chloride and 2, 6-diaminocaproic acid and the polycarboxylate water reducer is added into a concrete formula, so that the dispersion of cement particles can be effectively promoted, a flocculation structure is prevented from being formed in slurry, more free water molecules are formed in the slurry, the fluidity is increased, and a remarkable steric hindrance effect can be formed among the cement particles to prevent the cement particles from agglomerating, and the slump retention rate of the concrete is obviously improved.
Detailed Description
The hyperbranched triazine polymer is prepared by the following steps:
(1) Adding cyanuric chloride into acetone/water to obtain a solution a; adding 2, 6-diaminocaproic acid into water, adding sodium carbonate, and stirring for 10min to obtain a solution b; taking 1mol/L sodium hydroxide solution as solution c; the molar ratio of the 2, 6-diaminocaproic acid to the sodium carbonate is 2:1, a step of; the mole ratio of the cyanuric chloride to the 2, 6-diaminocaproic acid to the sodium hydroxide is 2:3.03:6, preparing a base material; in the solution a, the concentration of cyanuric chloride is 1mol/L, and the volume ratio of acetone to water is 2:1, a step of; in the solution b, the concentration of the 2, 6-diaminocaproic acid is 0.5mol/L;
(2) Cooling the solution a and maintaining the temperature within the range of 0-5 ℃, dropwise adding the 1/3 solution b and the 1/3 solution c within 2 hours, and continuing to react for 2 hours;
(3) Heating and maintaining the temperature within 48-52 ℃, dropwise adding 1/3 solution b and 1/3 solution c within 2 hours, and continuing to react for 2 hours;
(4) Evaporating acetone, heating and maintaining the temperature within the range of 88-92 ℃, dropwise adding 1/3 solution b and 1/3 solution c within 2 hours, and continuing to react for 8 hours;
(5) And regulating the pH value to 6.5, cooling, filtering, washing and drying to obtain the hyperbranched triazine polymer.
The prepared hyperbranched triazine polymer and a commercially available polycarboxylate water reducer (allyl polyether polycarboxylate water reducer, purchased from Jiangsu Bote New Material Co., ltd.) are mixed according to the following proportion to prepare a composite high-efficiency water reducer:
the weight ratio of the hyperbranched triazine polymer to the polycarboxylate superplasticizer is 1:9, compounding to obtain a composite high-efficiency water reducing agent a;
the weight ratio of the hyperbranched triazine polymer to the polycarboxylate superplasticizer is 1:4, compounding to obtain a composite high-efficiency water reducing agent b;
the weight ratio of the hyperbranched triazine polymer to the polycarboxylate water reducer is 3:7, compounding to obtain the composite high-efficiency water reducer c.
And (3) water reduction rate test: according to 6.5.2 in GB 8076-2008 concrete admixture standard, P.C 42.5.5 Portland cement is selected, sand and stone materials are prepared according to national standard requirements, the mixing amount of the fixed water reducer is 0.5% of the weight of the cement, the test temperature is 20 ℃, and the water reducing rates of the composite high-efficiency water reducer a, the composite high-efficiency water reducer b, the composite high-efficiency water reducer c and the commercially available polycarboxylic acid water reducer are 34.3%, 35.2%, 34.8% and 29.5% respectively. Therefore, when the mixing amount of the water reducer is the same, the water reducer can realize higher water reducing rate, and the effect of the water reducer b is slightly better than that of the water reducer a and the water reducer c.
Then, concrete preparation of examples 1 to 5 and comparative example 1 was performed using P.C42.5 Portland cement, sand having a particle size of 0.3 to 0.5mm, small stone having a particle size of 5 to 10mm, large stone having a particle size of 15 to 30mm, water, the composite superplasticizer of the present invention, or a commercially available polycarboxylate superplasticizer.
Example 1:
300 parts by weight of cement, 850 parts by weight of sand, 210 parts by weight of small stone, 770 parts by weight of large stone, 170 parts by weight of water and 0.9 part by weight of composite high-efficiency water reducing agent b (namely 0.3% of the weight of cement) are added into a concrete mixer and uniformly mixed, so that water-reducing concrete is obtained.
Example 2:
300 parts by weight of cement, 850 parts by weight of sand, 210 parts by weight of small stone, 770 parts by weight of large stone, 170 parts by weight of water and 1.2 parts by weight of composite high-efficiency water reducing agent b (namely 0.4% of the weight of cement) are added into a concrete mixer and uniformly mixed, so that water-reducing concrete is obtained.
Example 3:
300 parts by weight of cement, 850 parts by weight of sand, 210 parts by weight of small stone, 770 parts by weight of large stone, 170 parts by weight of water and 1.5 parts by weight of composite high-efficiency water reducing agent b (namely 0.5% of the weight of cement) are added into a concrete mixer and uniformly mixed, so that water-reducing concrete is obtained.
Example 4:
300 parts by weight of cement, 850 parts by weight of sand, 210 parts by weight of small stone, 770 parts by weight of large stone, 170 parts by weight of water and 1.5 parts by weight of composite high-efficiency water reducing agent a (namely 0.5% of the weight of cement) are added into a concrete mixer and uniformly mixed to obtain water-reducing concrete.
Example 5:
300 parts by weight of cement, 850 parts by weight of sand, 210 parts by weight of small stone, 770 parts by weight of large stone, 170 parts by weight of water and 1.5 parts by weight of composite high-efficiency water reducing agent c (namely 0.5% of the weight of cement) are added into a concrete mixer and uniformly mixed, so that water-reducing concrete is obtained.
Comparative example 1:
300 parts by weight of cement, 850 parts by weight of sand, 210 parts by weight of small stone, 770 parts by weight of large stone, 170 parts by weight of water and 1.5 parts by weight of a commercially available polycarboxylate superplasticizer (namely 0.5% of the weight of the cement) are added into a concrete mixer, and uniformly mixed to obtain water-reducing concrete.
Slump retention test: performing a slump test on concrete according to a method specified in a standard of a general concrete mixture performance test method of GB/T50080-2002, measuring a slump value to be H0, then filling all concrete into a plastic barrel, sealing, storing for 1H, measuring a slump value to be H1 again, and calculating a slump retention rate according to a formula H1/H20X100%; the test gave 1h slump retention rates of example 1, example 2, example 3, example 4, example 5, comparative example 1 as follows: 90.4%, 93.8%, 96.7%, 95.5%, 96.1%, 89.7%.
Claims (6)
1. The composite high-efficiency water-reducing concrete comprises 300-310 parts by weight of cement, 850-860 parts by weight of sand, 210-220 parts by weight of small stone, 770-780 parts by weight of large stone and 160-180 parts by weight of water, and is characterized by further comprising a composite high-efficiency water reducing agent; the dosage of the composite high-efficiency water reducer is 0.3-0.5% of the weight of cement;
the composite high-efficiency water reducer is a mixture of hyperbranched triazine polymer and polycarboxylate water reducer; the weight ratio of the hyperbranched triazine polymer to the polycarboxylate water reducer is 1-3:7-9;
the hyperbranched triazine polymer is prepared by the following steps:
(1) Adding cyanuric chloride into acetone/water to obtain a solution a; adding 2, 6-diaminocaproic acid into water, adding sodium carbonate, and stirring for 5-10min to obtain a solution b; taking sodium hydroxide solution as solution c; the molar ratio of the 2, 6-diaminocaproic acid to the sodium carbonate is 2:1, a step of; the mole ratio of the cyanuric chloride to the 2, 6-diaminocaproic acid to the sodium hydroxide is 2:3.03-3.06:6, preparing a base material;
(2) Cooling the solution a and maintaining the temperature within the range of 0-5 ℃, dropwise adding the 1/3 solution b and the 1/3 solution c within 2 hours, and continuing to react for 1.5-2.5 hours;
(3) Heating and maintaining the temperature within 48-52 ℃, dropwise adding 1/3 solution b and 1/3 solution c within 2 hours, and continuing to react for 1.5-2.5 hours;
(4) Evaporating acetone, heating and maintaining the temperature within 88-92 ℃, dropwise adding 1/3 solution b and 1/3 solution c within 2 hours, and continuing to react for 6-9 hours;
(5) And regulating the pH value to 6-7, cooling, filtering, washing and drying to obtain the hyperbranched triazine polymer.
2. The composite high-efficiency water-reducing concrete according to claim 1, wherein: the cement is P.C42.5 silicate cement; the grain diameter of the sand is 0.3-0.5mm; the particle size of the small stone is 5-10mm; the particle size of the marble is 15-30mm.
3. The composite high-efficiency water-reducing concrete according to claim 1, wherein: in the solution a, the concentration of cyanuric chloride is 0.8-1mol/L, and the volume ratio of acetone to water is 5:2-3.
4. The composite high-efficiency water-reducing concrete according to claim 1, wherein: in the solution b, the concentration of the 2, 6-diaminocaproic acid is 0.4-0.6mol/L.
5. The composite high-efficiency water-reducing concrete according to claim 1, wherein: the concentration of the sodium hydroxide solution is 0.8-1mol/L.
6. The preparation method of the composite high-efficiency water-reducing concrete according to any one of claims 1 to 5, wherein cement, sand, small stone, large stone, water and a water reducing agent are added into a concrete mixer and uniformly mixed; the method is characterized in that: the water reducing agent is the composite high-efficiency water reducing agent as claimed in claim 1.
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