CN115784662A - Concrete glue reducing agent - Google Patents
Concrete glue reducing agent Download PDFInfo
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- CN115784662A CN115784662A CN202211492373.6A CN202211492373A CN115784662A CN 115784662 A CN115784662 A CN 115784662A CN 202211492373 A CN202211492373 A CN 202211492373A CN 115784662 A CN115784662 A CN 115784662A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 87
- 239000004567 concrete Substances 0.000 title claims abstract description 82
- 239000003292 glue Substances 0.000 title claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000002253 acid Substances 0.000 claims abstract description 39
- -1 alcohol amine Chemical class 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 238000007710 freezing Methods 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 53
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 32
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 32
- 150000001732 carboxylic acid derivatives Chemical class 0.000 claims description 24
- 239000008367 deionised water Substances 0.000 claims description 24
- 229910021641 deionized water Inorganic materials 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000003999 initiator Substances 0.000 claims description 18
- 230000003472 neutralizing effect Effects 0.000 claims description 17
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 12
- 239000012986 chain transfer agent Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 10
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 5
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 claims description 5
- 230000002528 anti-freeze Effects 0.000 claims description 5
- 235000010288 sodium nitrite Nutrition 0.000 claims description 5
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 5
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 5
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 4
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 claims description 4
- VGTPCRGMBIAPIM-UHFFFAOYSA-M sodium thiocyanate Chemical compound [Na+].[S-]C#N VGTPCRGMBIAPIM-UHFFFAOYSA-M 0.000 claims description 4
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 4
- 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 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000002211 L-ascorbic acid Substances 0.000 claims description 3
- 235000000069 L-ascorbic acid Nutrition 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 3
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- FAYYUXPSKDFLEC-UHFFFAOYSA-L calcium;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [Ca+2].[O-]S([O-])(=O)=S FAYYUXPSKDFLEC-UHFFFAOYSA-L 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 3
- 239000001913 cellulose Substances 0.000 claims description 3
- 235000010980 cellulose Nutrition 0.000 claims description 3
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims description 3
- 229960001781 ferrous sulfate Drugs 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 3
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 claims description 3
- ALWXETURCOIGIZ-UHFFFAOYSA-N 1-nitropropylbenzene Chemical compound CCC([N+]([O-])=O)C1=CC=CC=C1 ALWXETURCOIGIZ-UHFFFAOYSA-N 0.000 claims description 2
- RFRMMZAKBNXNHE-UHFFFAOYSA-N 6-[4,6-dihydroxy-5-(2-hydroxyethoxy)-2-(hydroxymethyl)oxan-3-yl]oxy-2-(hydroxymethyl)-5-(2-hydroxypropoxy)oxane-3,4-diol Chemical compound CC(O)COC1C(O)C(O)C(CO)OC1OC1C(O)C(OCCO)C(O)OC1CO RFRMMZAKBNXNHE-UHFFFAOYSA-N 0.000 claims description 2
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 2
- ZNNZYHKDIALBAK-UHFFFAOYSA-M potassium thiocyanate Chemical compound [K+].[S-]C#N ZNNZYHKDIALBAK-UHFFFAOYSA-M 0.000 claims description 2
- 229940116357 potassium thiocyanate Drugs 0.000 claims description 2
- QVDTXNVYSHVCGW-ONEGZZNKSA-N isopentenol Chemical compound CC(C)\C=C\O QVDTXNVYSHVCGW-ONEGZZNKSA-N 0.000 claims 1
- 125000005394 methallyl group Chemical group 0.000 claims 1
- 239000004568 cement Substances 0.000 abstract description 38
- 239000002245 particle Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 7
- 229920005646 polycarboxylate Polymers 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 239000008030 superplasticizer Substances 0.000 abstract description 6
- 238000005054 agglomeration Methods 0.000 abstract description 3
- 230000002776 aggregation Effects 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 238000006703 hydration reaction Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 230000036571 hydration Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000006185 dispersion Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 239000012237 artificial material Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000007790 solid phase Substances 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
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a concrete gel reducing agent, and belongs to the technical field of concrete additives. The glue reducing agent is prepared by mixing the following raw materials in parts by weight: 4-10 parts of organic alcohol amine, 4-6 parts of polycarboxylic acid water reducing agent, 1-2 parts of early strength component, 0.5-1.5 parts of anti-freezing component, 0.03-0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated by 100 parts. According to the invention, by adding the comb-structure polycarboxylate superplasticizer, the organic alcohol amine and other components, the water consumption of single concrete can be reduced, and the water-cement ratio can be reduced, so that the early strength of the concrete is improved. The anti-gel agent disclosed by the invention is simple in preparation process, good in adaptability with cement, and strong in dispersibility, effectively relieves the cement particle agglomeration phenomenon in the concrete stirring process, obviously improves the strength increase rate of concrete, improves the fluidity of premixed concrete, solves the problem of slow strength increase of concrete at low temperature, enables the concrete to have frost resistance, and effectively reduces the cement dosage.
Description
Technical Field
The invention belongs to the technical field of concrete admixtures, and particularly relates to a concrete glue reducing agent and a preparation method thereof.
Background
The concrete is one of the most important building materials in modern society, has the characteristics of wide application range, easily available materials, low manufacturing cost, long service life and the like, mainly comprises cement, mineral admixture, coarse and fine aggregate, water and additive, and is formed into an artificial material with certain strength through the processes of mixing, forming, curing and the like. The polycarboxylic acid water reducing agent is a third-generation high-performance water reducing agent, has the advantages of high water reducing rate, low mixing amount, adjustable molecular structure and green and environment-friendly production process, and is one of the indispensable raw materials for the large concrete Cheng Bi at present.
The concrete gel reducing agent has the main effects that under the condition of achieving the same performance of concrete, the dosage of cement and other cementing materials can be obviously reduced, the workability of concrete is improved, the strength of concrete at each age is improved, the curing time of concrete is shortened, and the effects of cost reduction and efficiency improvement are finally achieved.
In actual engineering, because enterprises continuously control production cost, the usage amount of the single-side cementing material of concrete is continuously reduced, and the hidden trouble that the strength of concrete in the engineering does not reach the standard exists. And at present, mine resources are seriously consumed, the quality of sand and stone is continuously reduced, the workability of concrete is poor, the engineering construction process is influenced, and finally the engineering quality is seriously influenced. A method for maintaining high quality of concrete under the condition of low consumption of a cementing material is sought, and the method is an effective way for reducing cost, improving efficiency and ensuring quality of the existing concrete production enterprises, so that the development of the concrete gel reducer has very important significance.
Disclosure of Invention
In order to solve the problems of low strength and poor workability of concrete caused by small cement consumption, the invention provides the concrete gel reducing agent, which can ensure that the strength is qualified under the condition of reducing the single cement consumption of the concrete, simultaneously reduce the unit water consumption, improve the workability of the concrete, and realize cost reduction and efficiency improvement in the concrete industry.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 4-10 parts of organic alcohol amine, 4-6 parts of polycarboxylic acid water reducing agent, 1-2 parts of early strength component, 0.5-1.5 parts of anti-freezing component, 0.03-0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated by 100 parts.
More preferably, the concrete gel reducing agent is prepared from the following raw materials in parts by weight: 6 parts of organic alcohol amine, 4 parts of polycarboxylic acid water reducing agent, 1.5 parts of early strength component, 1 part of anti-freezing component, 0.03 part of water-retaining tackifying component and the balance of water, wherein the total amount is 100 parts.
Preferably, the organic alcohol amine is one or more of triethanolamine, triisopropanolamine and diethanolisopropanolamine.
Preferably, the polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 35-45 parts of unsaturated polyoxyethylene ether, 4-7 parts of unsaturated carboxylic acid, 0.15-0.2 part of reducing agent, 0.14-0.22 part of initiator, 0.3-0.4 part of chain transfer agent, 2-3 parts of neutralizing agent and 37-46 parts of deionized water.
More preferably, the unsaturated polyoxyethylene ether is one of methyl allyl polyoxyethylene ether, isoamyl alcohol polyoxyethylene and ethylene glycol monovinyl polyvinyl alcohol ether.
More preferably, the unsaturated carboxylic acid is one of acrylic acid and/or methacrylic acid.
More preferably, the reducing agent is one or more of sodium formaldehyde sulfoxylate, ferrous sulfate and L-ascorbic acid; the initiator is one of hydrogen peroxide and ammonium persulfate; the chain transfer agent is one or more of mercaptoethanol, thioglycolic acid, mercaptopropionic acid and sodium hypophosphite; the neutralizer is sodium hydroxide solution.
More preferably, the preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
(1) Weighing 35-45 parts of unsaturated polyoxyethylene ether, dissolving in 25-30 parts of deionized water, and heating the solution to 25 +/-2 DEG
After the unsaturated polyoxyethylene ether is completely dissolved, adding 1-2 parts of unsaturated carboxylic acid and 0.14-0.22 part of initiator into the solution at one time, and stirring for 10-15 minutes until the mixture is uniform to obtain a bottom material;
(2) Preparing dropping liquid, dissolving 3-5 parts of unsaturated carboxylic acid and 0.3-0.4 part of transfer agent in 6-8 parts of deionized water to obtain a material a; 0.15-0.2 part of reducing agent is dissolved in 6-8 parts of deionized water to obtain a material b;
(3) Dropping materials a and b into the base material at the same time, controlling the dropping time of the material a to be 120 +/-10 min, and controlling the dropping time of the material b to be 150 +/-
Controlling the reaction temperature not to exceed 45 ℃ for 10 min;
(4) And (c) after the materials a and b are dripped, continuously stirring for 1-1.5h, and adding 2-3 parts of a neutralizing agent to obtain the polycarboxylic acid water reducing agent.
Preferably, the early strength component is one or more of sodium thiosulfate, calcium thiosulfate and calcium chloride.
Preferably, the antifreeze component is one or more of sodium nitrite, sodium thiocyanate, potassium thiocyanate and calcium thiocyanate.
Preferably, the water-retaining viscosity-increasing component is one or more of carboxymethyl propyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose.
When the concrete gel reducer is used, the mixing amount is 0.6-0.8% of the total amount of the concrete gel material. The organic alcohol amine has the effect of promoting the hydration rate of cement particles, thereby improving the strength of concrete, having obvious dispersion effect on cement and enabling concrete slurry to be more uniform. The invention synthesizes and prepares the polycarboxylic acid water reducing agent with a comb-type structure, and the molecular structure is as follows:
the polycarboxylate superplasticizer prepared by the invention can reduce the water consumption of single-side concrete and reduce the water-cement ratio, thereby improving the early strength of the concrete, and meanwhile, molecules of the polycarboxylate superplasticizer are adsorbed on the surfaces of cement particles, so that the surface electrical property of the cement particles is changed, and the electrostatic repulsion effect is achieved; the branched chain of the polycarboxylate superplasticizer molecule is provided with hydroxyl and ether, so that the polycarboxylate superplasticizer molecule has hydrophilicity, the groups are combined with water molecules through a hydrogen bond form to form a water film on the surface of cement particles, and the water film has good lubricating effect, so that the resistance among the cement particles can be effectively reduced, and the fluidity of concrete is increased; the side chain of the polycarboxylic acid molecule extends among cement particles to play a role in steric hindrance, and further promotes the dispersion among the cement particles.
Particularly, the organic alcohol amine and the polycarboxylic acid water reducing agent have the synergistic enhancement effect that: according to the close packing principle, each component in the concrete system sequentially fills the system space, so that the compactness and the strength of the concrete system are closely related. As is known, hydration products generated by cement hydration are a main source of the strength of cement-based materials, the water-cement ratio is an important factor influencing the hydration degree of cement, the cement hydration is incomplete due to the excessively low water-cement ratio, the concrete workability is poor, the free water in a system is excessive due to the excessively high water-cement ratio, and the concrete compactness is poor. The polycarboxylic acid water reducing agent can obviously reduce the water-cement ratio of a system on the premise of ensuring the workability of concrete, and has the practical function of releasing free water wrapped by cement particles to participate in hydration reaction. The organic alcohol amine has the effect of promoting the dispersibility of cement particles, so that the concrete slurry is more uniform, alcohol amine molecules are adsorbed on the surfaces of the cement particles to form a layer of charged hydrophilic film, the surface tension of a solution is reduced, the volume expansion of a solid phase caused by hydration is enhanced, and a concrete structure is filled. In conclusion, the polycarboxylate superplasticizer disclosed by the invention is used together with organic alcohol amine, so that enough bound water can be obtained to ensure cement hydration under the condition of ensuring a low water-cement ratio.
Secondly, the early strength component can react with the hydration product of cement, namely hydrated calcium aluminate to generate a large amount of ettringite, so that the hydration process of the cement is accelerated. The antifreezing component can reduce the freezing point of a concrete mixture, so that the concrete can still keep the workability and the cement hydration effect at low temperature, and the concrete setting time is shortened; the water-retaining tackifying component can keep the concrete mixture in a uniform state when the dosage of cement is low, and prevent the conditions of dispersion, exposed stones and the like.
Advantageous effects
The invention has the advantages that the components act together, the dispersibility is very strong, the problem of cement particle agglomeration in the concrete mixing process is solved, the concrete strength increase rate is effectively improved, the concrete can still keep better workability and strength at low temperature, and the cost reduction and efficiency improvement effects are obvious for concrete enterprises. Under the condition of 0.6-0.8% of doping amount, the C30 concrete can reduce the using amount of single-component cement by 8-15%, reduce the water consumption of single component by 8-10%, enable the 7d strength ratio of the concrete to be not less than 103%, enable the 28d strength ratio to be not less than 105%, obviously improve the workability of the concrete, and have no adverse effect on other properties of the concrete.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.
Example 1
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 4 parts of organic alcohol amine, 4 parts of polycarboxylic acid water reducing agent, 1 part of early strength component, 0.5 part of anti-freezing component, 0.03 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated according to 100 parts.
The organic alcohol amine is triisopropanolamine.
The polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 35 parts of unsaturated polyoxyethylene ether, 4 parts of unsaturated carboxylic acid, 0.15 part of reducing agent, 0.14 part of initiator, 0.3 part of chain transfer agent, 2 parts of neutralizing agent and 37 parts of deionized water.
The unsaturated polyoxyethylene ether is ethylene glycol monovinyl polyvinyl alcohol ether.
The unsaturated carboxylic acid is methacrylic acid.
The reducing agent is ferrous sulfate; the initiator is hydrogen peroxide; the chain transfer agent is mercaptoethanol; the neutralizing agent is sodium hydroxide solution.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
(1) Weighing 35 parts of unsaturated polyoxyethylene ether, dissolving the unsaturated polyoxyethylene ether in 25 parts of deionized water, heating the solution to 25 +/-2 ℃, adding 1 part of unsaturated carboxylic acid and 0.14 part of initiator into the solution at one time after the unsaturated polyoxyethylene ether is completely dissolved, and stirring for 10 minutes until the mixture is uniform to obtain a base material;
(2) Preparing dropping liquid, dissolving 3 parts of unsaturated carboxylic acid and 0.3 part of transfer agent in 6 parts of deionized water to obtain a material a; 0.15 part of reducing agent is dissolved in 6 parts of deionized water to obtain a material b;
(3) Dropping materials a and b into the base material at the same time, controlling the dropping time of the material a to be 120 +/-10 min, and controlling the dropping time of the material b to be 150 +/-
Controlling the reaction temperature not to exceed 45 ℃ for 10 min;
(4) And c, after the dropping of the materials a and b is finished, continuously stirring for 1 hour, and adding 2 parts of neutralizing agent to obtain the polycarboxylic acid water reducing agent.
The early strength component is calcium chloride.
The anti-freezing component is sodium thiocyanate.
The water-retaining tackifying component is carboxymethyl propyl cellulose.
Example 2
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 6 parts of organic alcohol amine, 4 parts of polycarboxylic acid water reducing agent, 1.5 parts of early strength component, 1 part of anti-freezing component, 0.03 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated according to 100 parts.
The organic alcohol amine is prepared by mixing diethanol monoisopropanolamine and triethanolamine according to the weight ratio of 2:1.
The polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 40 parts of unsaturated polyoxyethylene ether, 4.5 parts of unsaturated carboxylic acid, 0.16 part of reducing agent, 0.16 part of initiator, 0.33 part of chain transfer agent, 2 parts of neutralizing agent and 40 parts of deionized water.
The unsaturated polyoxyethylene ether is methyl allyl polyoxyethylene ether, and the average molecular weight is 2400.
The unsaturated carboxylic acid is acrylic acid.
The reducing agent is sodium formaldehyde sulfoxylate; the initiator is hydrogen peroxide; the chain transfer agent is mercaptopropionic acid; the neutralizing agent is sodium hydroxide solution.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
(1) Weighing 40 parts of unsaturated polyoxyethylene ether, dissolving the unsaturated polyoxyethylene ether in 26 parts of deionized water, heating the solution to 25 +/-2 ℃, adding 1.5 parts of unsaturated carboxylic acid and 0.16 part of initiator into the solution at one time after the unsaturated polyoxyethylene ether is completely dissolved, and stirring for 10 minutes until the mixture is uniform to obtain a base material;
(2) Preparing dropping liquid, dissolving 3 parts of unsaturated carboxylic acid and 0.33 part of transfer agent in 6 parts of deionized water to obtain dropping liquid a;
0.16 part of reducing agent is dissolved in 8 parts of deionized water to obtain a dropwise added material b;
(3) Dropping materials a and b into the base material at the same time, controlling the dropping time of the material a to be 120 +/-10 min, and controlling the dropping time of the material b to be 150 +/-
Controlling the reaction temperature not to exceed 45 ℃ for 10 min;
(4) And c, after the dropping of the materials a and b is finished, continuously stirring for 1 hour, and adding 2 parts of neutralizing agent to obtain the polycarboxylic acid water reducing agent.
The early strength component is sodium thiosulfate.
The antifreeze component is sodium nitrite.
The water-retaining viscosity-increasing component is hydroxypropyl methyl cellulose.
Example 3
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 8 parts of organic alcohol amine, 5 parts of polycarboxylic acid water reducing agent, 1 part of early strength component, 1 part of anti-freezing component, 0.03 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated according to 100 parts.
The organic alcohol amine is prepared by mixing diethanol monoisopropanolamine and triisopropanolamine according to the weight ratio of 1:1.
The polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 35 parts of unsaturated polyoxyethylene ether, 5 parts of unsaturated carboxylic acid, 0.15 part of reducing agent, 0.14 part of initiator, 0.3 part of chain transfer agent, 2 parts of neutralizing agent and 39 parts of deionized water.
The unsaturated polyoxyethylene ether is methyl allyl polyoxyethylene ether, and the average molecular weight is 2400.
The unsaturated carboxylic acid is acrylic acid.
The reducing agent is sodium formaldehyde sulfoxylate; the initiator is hydrogen peroxide; the chain transfer agent is mercaptopropionic acid; the neutralizing agent is sodium hydroxide solution.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
(1) Weighing 35 parts of unsaturated polyoxyethylene ether, dissolving the unsaturated polyoxyethylene ether in 25 parts of deionized water, heating the solution to 25 +/-2 ℃, adding 2 parts of unsaturated carboxylic acid and 0.14 part of initiator into the solution at one time after the unsaturated polyoxyethylene ether is completely dissolved, and stirring for 10 minutes until the mixture is uniform to obtain a base material;
(2) Preparing dropping liquid, dissolving 3 parts of unsaturated carboxylic acid and 0.3 part of transfer agent in 7 parts of deionized water to obtain dropping liquid a;
0.15 part of reducing agent is dissolved in 7 parts of deionized water to obtain a dropwise added material b;
(3) Dropping materials a and b into the base material at the same time, controlling the dropping time of the material a to be 120 +/-10 min, and controlling the dropping time of the material b to be 150 +/-
Controlling the reaction temperature not to exceed 45 ℃ for 10 min;
(4) And c, after the dropping of the materials a and b is finished, continuously stirring for 1 hour, and adding 2 parts of neutralizing agent to obtain the polycarboxylic acid water reducing agent.
The early strength component is one or more of sodium thiosulfate, calcium thiosulfate and calcium chloride.
The antifreeze component is sodium nitrite.
The water-retaining viscosity-increasing component is hydroxypropyl methyl cellulose.
Example 4
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 10 parts of organic alcohol amine, 6 parts of polycarboxylic acid water reducing agent, 2 parts of early strength component, 1.5 parts of anti-freezing component, 0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is 100 parts.
The organic alcohol amine is prepared by mixing diethanol monoisopropanolamine and triisopropanolamine according to the weight ratio of 1:1.
The polycarboxylic acid water reducing agent is prepared from the following raw materials in parts by weight: 45 parts of unsaturated polyoxyethylene ether, 7 parts of unsaturated carboxylic acid, 0.2 part of reducing agent, 0.22 part of initiator, 0.4 part of chain transfer agent, 3 parts of neutralizing agent and 46 parts of deionized water.
The unsaturated polyoxyethylene ether is ethylene glycol monovinyl polyvinyl alcohol ether with the average molecular weight of 3000.
The unsaturated carboxylic acid is acrylic acid.
The reducing agent is L-ascorbic acid; the initiator is hydrogen peroxide; the chain transfer agent is sodium hypophosphite; the neutralizing agent is sodium hydroxide solution.
The preparation method of the polycarboxylic acid water reducing agent comprises the following steps:
(1) Weighing 45 parts of unsaturated polyoxyethylene ether, dissolving the unsaturated polyoxyethylene ether in 30 parts of deionized water, heating the solution to 25 +/-2 ℃, adding 2 parts of unsaturated carboxylic acid and 0.22 part of initiator into the solution at one time after the unsaturated polyoxyethylene ether is completely dissolved, and stirring for 15 minutes until the mixture is uniform to obtain a base material;
(2) Preparing dropping liquid, dissolving 5 parts of unsaturated carboxylic acid and 0.4 part of transfer agent in 8 parts of deionized water to obtain dropping liquid a;
0.2 part of reducing agent is dissolved in 8 parts of deionized water to obtain dropwise added material b;
(3) Dropping materials a and b into the base material at the same time, controlling the dropping time of the material a to be 120 +/-10 min, and controlling the dropping time of the material b to be 150 +/-
Controlling the reaction temperature not to exceed 45 ℃ for 10 min;
(4) And after the material dropping of the step a and the material dropping of the step b are finished, continuously stirring for 1.5 hours, and adding 3 parts of neutralizing agent to obtain the polycarboxylic acid water reducing agent.
The early strength component is prepared by mixing sodium thiosulfate and sodium thiocyanate according to the weight ratio of 2:1.
The antifreeze component is sodium nitrite.
The water-retaining tackifying component is carboxymethyl cellulose.
Comparative example 1
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 10 parts of organic alcohol amine, 2 parts of early strength component, 1.5 parts of anti-freezing component, 0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated by 100 parts. The only difference between this comparative example and example 4 is that: the raw material composition does not contain a polycarboxylic acid water reducing agent.
Comparative example 2
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 6 parts of polycarboxylic acid water reducing agent, 2 parts of early strength component, 1.5 parts of anti-freezing component, 0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is 100 parts.
The only difference between this comparative example and example 4 is that: the raw material composition does not contain organic alcohol amine.
Comparative example 3
The concrete gel reducing agent is prepared by mixing the following raw materials in parts by weight: 10 parts of organic alcohol amine, 6 parts of polycarboxylic acid water reducing agent, 2 parts of early strength component, 1.5 parts of anti-freezing component, 0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated according to 100 parts.
The only difference between this comparative example and example 4 is: the polycarboxylic acid water reducing agent in the raw material composition is a common commercial polycarboxylic acid water reducing agent (the comparative example adopts a high-performance polycarboxylic acid water reducing agent produced by lake south China rock building materials science and technology limited).
Performance test
The concrete gel reducing agents prepared in examples 1-4 and comparative examples 1-3 are compared according to JCT 2469-2018 standard, the strength of the experimental design is C30, 330kg/m < 3 > of conch (PO 42.5 grade) cement is adopted, 5-20mm of stones are continuously graded, the sand rate is 38%, the water consumption is based on the water consumption when the standard concrete slump is 80 +/-10 mm, the mixing amount of the gel reducing agent is 0.8%, and the gel reducing rate is tested according to 10%. The results of the experiment are shown in table 1:
table 1 results of performance testing
The test data of the invention show that the concrete of the test group using the glue reducing agent of the embodiments 1-4 of the invention has strong compressive strength, good flow property and good frost resistance, while the concrete of the test group lacks organic alcohol amine or the comparative examples 1-3 added with polycarboxylic acid of the invention has various reduced performances, thus showing that the polycarboxylic acid water reducing agent prepared by the invention has strong synergistic dispersion promoting effect with organic alcohol amine, reduces water consumption, solves the problem of cement particle agglomeration in the concrete mixing process, effectively improves the concrete strength increase rate, and can keep better working performance and strength at low temperature, and has remarkable economic benefit.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
Claims (10)
1. The concrete gel reducing agent is characterized by being prepared by mixing the following raw materials in parts by weight: 4-10 parts of organic alcohol amine, 4-6 parts of polycarboxylic acid water reducing agent, 1-2 parts of early strength component, 0.5-1.5 parts of anti-freezing component, 0.03-0.05 part of water-retaining tackifying component and the balance of water, wherein the total amount is calculated by 100 parts.
2. The concrete glue reducer according to claim 1, wherein the organic alcohol amine is one or more of triethanolamine, triisopropanolamine, and diethanolisopropanolamine.
3. The concrete water reducer according to claim 1, wherein the polycarboxylic acid water reducer is prepared from the following raw materials in parts by weight: 35-45 parts of unsaturated polyoxyethylene ether, 4-7 parts of unsaturated carboxylic acid, 0.15-0.2 part of reducing agent, 0.14-0.22 part of initiator, 0.3-0.4 part of chain transfer agent, 2-3 parts of neutralizing agent and 37-46 parts of deionized water.
4. The concrete gel reducing agent according to claim 3, wherein the unsaturated polyoxyethylene ether is one of methallyl polyoxyethylene ether, isopentenol polyoxyethylene, and ethylene glycol monovinyl polyvinyl alcohol ether.
5. The concrete size reducer according to claim 3, wherein the unsaturated carboxylic acid is acrylic acid and/or methacrylic acid.
6. The concrete gel reducing agent according to claim 3, wherein the reducing agent is one or more of sodium formaldehyde sulfoxylate, ferrous sulfate and L-ascorbic acid; the initiator is one of hydrogen peroxide and ammonium persulfate; the chain transfer agent is one or more of mercaptoethanol, thioglycolic acid, mercaptopropionic acid and sodium hypophosphite; the neutralizing agent is sodium hydroxide solution.
7. The concrete water reducer according to any one of claims 3 to 6, wherein the polycarboxylic acid water reducer is prepared by the following steps:
(1) Weighing 35-45 parts of unsaturated polyoxyethylene ether, dissolving in 25-30 parts of deionized water, heating the solution to 25 +/-2 ℃, adding 1-2 parts of unsaturated carboxylic acid and 0.14-0.22 part of initiator into the solution at one time after the unsaturated polyoxyethylene ether is completely dissolved, and stirring for 10-15 minutes until the mixture is uniform to obtain a base material;
(2) Preparing dropping liquid, dissolving 3-5 parts of unsaturated carboxylic acid and 0.3-0.4 part of transfer agent in 6-8 parts of deionized water to obtain a material a;
0.15-0.2 part of reducing agent is dissolved in 6-8 parts of deionized water to obtain a material b;
(3) Simultaneously dripping the material a and the material b into the backing material, controlling the dripping time of the material a to be 120 +/-10 min, controlling the dripping time of the material b to be 150 +/-10 min, and controlling the reaction temperature to be not more than 45 ℃;
(4) And (c) after the materials a and b are dripped, continuously stirring for 1-1.5h, and adding 2-3 parts of a neutralizing agent to obtain the polycarboxylic acid water reducing agent.
8. The concrete gel reducing agent of claim 1, wherein the early strength component is one or more of sodium thiosulfate, calcium thiosulfate and calcium chloride.
9. The concrete gel reducer according to claim 1, wherein the antifreeze component is one or more of sodium nitrite, sodium thiocyanate, potassium thiocyanate and calcium thiocyanate.
10. The concrete gel reducing agent of claim 1, wherein the water-retaining tackifying component is one or more of carboxymethyl propyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose and carboxymethyl cellulose.
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| CN109265042A (en) * | 2018-10-29 | 2019-01-25 | 深圳市三绿科技有限公司 | A kind of concrete subtracts jelly and preparation method thereof |
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| CN109265042A (en) * | 2018-10-29 | 2019-01-25 | 深圳市三绿科技有限公司 | A kind of concrete subtracts jelly and preparation method thereof |
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