CN116693231A - Viscosity reducer for low-water-gel-ratio concrete and application thereof - Google Patents
Viscosity reducer for low-water-gel-ratio concrete and application thereof Download PDFInfo
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- CN116693231A CN116693231A CN202210177262.XA CN202210177262A CN116693231A CN 116693231 A CN116693231 A CN 116693231A CN 202210177262 A CN202210177262 A CN 202210177262A CN 116693231 A CN116693231 A CN 116693231A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 67
- 239000004567 concrete Substances 0.000 title claims abstract description 55
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 30
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 150000001298 alcohols Chemical class 0.000 claims abstract description 14
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims abstract description 11
- 150000002170 ethers Chemical class 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 239000004568 cement Substances 0.000 claims description 18
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 claims description 3
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 150000002009 diols Chemical class 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 29
- 230000000694 effects Effects 0.000 abstract description 16
- 239000004570 mortar (masonry) Substances 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 7
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 229920005862 polyol Polymers 0.000 abstract 1
- 150000003077 polyols Chemical class 0.000 abstract 1
- 235000011187 glycerol Nutrition 0.000 description 17
- 230000001603 reducing effect Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 12
- 238000002474 experimental method Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000000654 additive Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000011374 ultra-high-performance concrete Substances 0.000 description 5
- KOVAQMSVARJMPH-UHFFFAOYSA-N 4-methoxybutan-1-ol Chemical compound COCCCCO KOVAQMSVARJMPH-UHFFFAOYSA-N 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 4
- 229910021487 silica fume Inorganic materials 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000004579 marble Substances 0.000 description 3
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005886 esterification reaction Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- YPFDHNVEDLHUCE-UHFFFAOYSA-N propane-1,3-diol Chemical compound OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 150000005219 trimethyl ethers Chemical class 0.000 description 2
- -1 unsaturated phosphate ester Chemical class 0.000 description 2
- BEVWMRQFVUOPJT-UHFFFAOYSA-N 2,4-dimethyl-1,3-thiazole-5-carboxamide Chemical compound CC1=NC(C)=C(C(N)=O)S1 BEVWMRQFVUOPJT-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
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- CFVWNXQPGQOHRJ-UHFFFAOYSA-N 2-methylpropyl prop-2-enoate Chemical compound CC(C)COC(=O)C=C CFVWNXQPGQOHRJ-UHFFFAOYSA-N 0.000 description 1
- VATRWWPJWVCZTA-UHFFFAOYSA-N 3-oxo-n-[2-(trifluoromethyl)phenyl]butanamide Chemical compound CC(=O)CC(=O)NC1=CC=CC=C1C(F)(F)F VATRWWPJWVCZTA-UHFFFAOYSA-N 0.000 description 1
- HMBNQNDUEFFFNZ-UHFFFAOYSA-N 4-ethenoxybutan-1-ol Chemical compound OCCCCOC=C HMBNQNDUEFFFNZ-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- INSRQEMEVAMETL-UHFFFAOYSA-N decane-1,1-diol Chemical compound CCCCCCCCCC(O)O INSRQEMEVAMETL-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- SZXQTJUDPRGNJN-UHFFFAOYSA-N dipropylene glycol Chemical compound OCCCOCCCO SZXQTJUDPRGNJN-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000032050 esterification Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 210000003722 extracellular fluid Anatomy 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 150000002334 glycols Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- DCNHVBSAFCNMBK-UHFFFAOYSA-N naphthalene-1-sulfonic acid;hydrate Chemical compound O.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 DCNHVBSAFCNMBK-UHFFFAOYSA-N 0.000 description 1
- QUADBKCRXGFGAX-UHFFFAOYSA-N octane-1,7-diol Chemical compound CC(O)CCCCCCO QUADBKCRXGFGAX-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 150000004072 triols Chemical class 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a viscosity reducer for low-water-to-gel-ratio concrete and application thereof. The viscosity reducer is prepared from three components of A, B, C in a mass ratio of (50-80): (30-20): (0-20) mixing and preparing; the component A is selected from any one or a mixture of a plurality of small molecular dihydric alcohols and small molecular dihydric alcohol derivatives; the component B is selected from any one or two of glycerol and glycerol polyoxyethylene ether derivatives and is mixed in any proportion; the component C is pentaerythritol polyoxyethylene ether. The small molecular polyol and the derivative thereof in the viscosity reducer component have the structure of low-density nonionic non-adsorption molecules, have a spacing effect, can be effectively dissolved in a mesopore solution, solve the problem that interstitial water among particles cannot be released under a low water-gel ratio, effectively reduce the viscosity of mortar or concrete, remarkably improve the fluidity of the mortar and moderately improve the expansion degree of the concrete.
Description
Technical Field
The invention belongs to the technical field of building additives, and particularly relates to a viscosity reducer for concrete, which is suitable for low-water-gel-ratio conditions, and application thereof.
Background
High Performance Concrete (HPC) and Ultra High Performance Concrete (UHPC) and the like adopt the technical characteristics of low water-gel ratio and large bulk density for the excellent post strength and working performance of the concrete, and proper fluidity and slump can be achieved through the PCE water reducer, but the concrete has the viscous characteristic of rapidly rising under the low water-gel ratio, so that the excessive viscosity and overlong flowing time are brought to the difficulty of construction such as pumping the concrete, self-leveling the concrete and the like. Current research on the viscosity of low-water-gel-ratio concrete is mainly carried out in ordinary concrete and high-performance concrete (HPC), and especially the water-gel ratio of UHPC is generally lower than 0.27 and even 0.14 in very low cases, so that the viscosity-reducing method of ordinary concrete is not necessarily applicable to UHPC.
In the current report on the viscosity reduction method of UHPC, the mixing ratio of silica fume, mineral powder, steel fiber and other inert admixtures is mainly adjusted to optimize grading of concrete with low water-cement ratio and introduce stronger ball effect, so that the internal friction of the concrete is reduced to bring viscosity reduction, but the method has the defects that the mixing amount for adjusting the viscosity by a physical method is larger, the quality of high-quality silica fume, stone powder and the like is difficult to control, and the cost is larger.
In the report of viscosity reduction by adopting a chemical additive, patent CN201610331188.7 proposes a viscosity reducer based on the polymerization of 4-hydroxybutyl vinyl ether, unsaturated amide and unsaturated phosphate ester as raw materials, wherein the mass ratio of the three materials is 1 (0.5-3) (0.01-0.1), and the weight average molecular weight of the viscosity reducer is mainly concentrated between 55000 and 300000, so that the molecular weight of the viscosity reducer is larger, and the action mechanism of the viscosity reducer is mainly concentrated in the following aspects: on one hand, the dispersion force is improved through the hydrolysis of the ester type water reducer in the alkali solution, the phosphate group after the hydrolysis can provide stronger electronegativity than the carboxyl group, on the other hand, the workability is improved through the TOMS effect of the polymer, the viscosity of pumped concrete and the like is reduced, and although the reverse taper time of mortar and concrete is faster, the viscosity reducer is enhanced due to the fact that the molecular weight is larger, the crosslinking effect between cement and a rubber material is enhanced, and the viscosity reducer is unfavorable for releasing free water among particles.
Wu Wei and the like reduce the viscosity of retarding soil by a method of synthesizing viscosity-reducing carboxylic acid in the synthesis and characterization of a high-adaptability phosphate-based modified polycarboxylate water reducer, the main chain of the PCE water reducer modified by phosphate groups generally has stronger electronegativity by introducing a phosphate group structure with stronger negative charge, and the particle dispersion effect is influenced by combining steric hindrance and stronger repulsive force, so that the viscosity of concrete is reduced, but the method has the defect that the experiment effect under the water-gel ratio of 0.29 is verified by experiments, and the viscosity-reducing effect under the water-gel ratio of UHPC is less remarkable.
The patent CN201810601948.0 reports that a polymer viscosity reducer with certain water reducing property is synthesized, the method comprises two steps of esterification reaction and free radical polymerization, the polymer structure is a comb-shaped structure, the main chain consists of acrylic acid and isobutyl acrylate, and the branched chain consists of maleic anhydride-polyethylene glycol esterification structure, so that the product has good water reducing effect. The good steric hindrance effect is formed by different chain lengths of the polyvinyl alcohol, so that van der Waals attraction among particles is prevented, and the purposes of reducing water and viscosity are achieved. .
The development of the concrete viscosity reducer which can be well matched with the existing water reducer system, has outstanding viscosity reducing effect and is suitable for the condition of low water-cement ratio has great benefits for the construction and working performance of concrete.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the viscosity reducer for the low-water-to-gel-ratio concrete, and the viscosity reducer product has the characteristics of simple manufacturing mode, excellent viscosity reducing effect in the process of compounding and using the water reducer and suitability for the low-water-to-gel-ratio mortar or concrete.
Another object of the invention is to provide the use of the above-mentioned concrete viscosity reducer.
The technical scheme of the invention is as follows:
the invention provides a viscosity reducer for low-water-gel-ratio concrete, which is prepared from A, B, C three components in mass ratio (50-80): (30-20): (0-20) mixing and preparing;
the component A is selected from any one or a mixture of a plurality of small molecular dihydric alcohols and small molecular dihydric alcohol derivatives;
the component B is selected from any one or two of glycerol and glycerol polyoxyethylene ether derivatives and is mixed in any proportion;
the component C is pentaerythritol polyoxyethylene ether.
The small molecular dihydric alcohol in the component A is selected from any one or more of all linear and branched dihydric alcohols of C3-C8, and the small molecular dihydric alcohol derivative is selected from one or more of polyoxyethylene ether derivatives of the linear/branched dihydric alcohol, and the small molecular dihydric alcohol derivatives are mixed in any proportion;
the micromolecular dihydric alcohol is selected from any one or more of diethylene glycol, triethylene glycol, tetraethylene glycol and monomers shown in a structural general formula (I) to be mixed according to any proportion, the general formula of the micromolecular dihydric alcohol derivative is shown in (II),
in the general formulae (I) and (II), a=1 to 6, a 1 ＝1～6，b＝2～7，R、R 1 Independently select-H, -CH 3 、-CH 2 CH 3 or-CH (CH) 3 ) 2 。
The structure of the glycerol polyoxyethylene ether derivative of the component B is shown as the following formula (III), wherein c=2-7;
the component C is pentaerythritol polyoxyethylene ether, and the structural general formula of the component C Is (IV), wherein d=2-7;
according to a second aspect of the present invention there is also provided the use of the viscosity reducer. The conventional mixing amount of the viscosity reducer is 0.2-4% of the total weight of the cementing material, the optimal mixing amount is 0.5-2%, and the mixing amount is pure solid mixing amount. The mixing amount is too low, the wetting of cement particles is insufficient, the release of cement interstitial fluid is insufficient, the synergistic effect with water reducer molecules is insufficient, the viscosity improvement is not obvious under the low water-cement ratio, the mixing amount is too high, the cost is easy to be higher, the effect in the solution is balanced, and the dispersion promoting effect and the viscosity reducing effect of the water reducer cannot be further improved. In actual use, engineering personnel can be optimized in the range according to application scenes.
The invention has the beneficial effects that:
the viscosity-reducing carboxylic acid water reducer or admixture disclosed by different Yu Jiaoduo in the invention has viscosity-reducing work, and the viscosity-reducing technology of small molecular compounds is less involved in the prior art; the invention relates to a structure of micromolecular polyalcohol and derivatives thereof contained in a viscosity reducer component, which is a low-density nonionic non-adsorption molecule, has a spacing effect, can be effectively dissolved in a gap hole solution, solves the problem that gap water among particles cannot be released under a low water-gel ratio, prevents a polycarboxylic acid water reducer which is not adsorbed under the condition of the low water-gel ratio from bridging among particles, releases more free water, effectively reduces the viscosity of mortar or concrete, obviously improves the fluidity of the mortar, and moderately improves the expansion degree of the concrete.
Detailed Description
The following examples illustrate in greater detail the concrete viscosity reducer prepared according to the present invention, with the purpose of enabling those skilled in the art to understand the present invention and to implement it accordingly, but are in no way intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Example 1
The concrete viscosity reducer consists of diglycol and glycerin: pentaerythritol polyoxyethylene ether (d=3) is composed of the components in parts by weight of 50:30:20.
Example 2
A concrete viscosity reducer comprises the components of A (1, 3-propylene glycol (a=1) +dipropylene glycol polyoxyethylene ether (b=2)): B (glycerin: glycerol polyoxyethylene ether (c=2)) in parts by weight of A (20+50): B (15:15).
Example 3
A viscosity reducer for concrete is prepared from (tetraethylene glycol+2-methyl-3, 6-hexanediol polyethenoxy ether (R) 1 is-CH (CH) 3 ) 2 B=5)): pentaerythritol polyoxyethylene ether (d=7) = (35+35): (14+6): 10.
Example 4
A concrete viscosity reducer comprises the components of A (1, 7-octanediol (a=6)): B (1, 4-butanediol monomethyl ether+glycerol polyoxyethylene ether (c=7)): C (pentaerythritol polyoxyethylene ether (d=3))=50 (20+10): 20).
Example 5
A concrete viscosity reducer comprises the components of A (2-methyl-2, 4-pentanediol) B (glycerol+glycerol polyoxyethylene ether (c=5))= (70): (20+10).
Example 6
A concrete viscosity reducer comprises the components of A (1, 4-butanediol+triethylene glycol+heptaethylene glycol) B (1, 4-butanediol monomethyl ether+glycerol polyoxyethylene ether (c=2)): c (pentaerythritol polyoxyethylene ether (d=3))= (20+20+20): (20+15): 5.
Comparative example 1 (component A adopts glycol derivative in the form of monomethyl ether)
A viscosity reducer for concrete is prepared from A (1, 4-butanediol monomethyl ether) +B (glycerin alcohol)
Polyoxyethylene ether (c=7))=60:40.
Comparative example 2 (Glycerol polyoxyethylene ether for component B, c > 7)
A concrete viscosity reducer comprises a component A (diethylene glycol+dipropylene glycol dimethyl ether) and a component B (glycerol polyoxyethylene ether (c=10))=70:30.
Comparative example 3 (derivative of component B Using non-hydroxyl end group)
A concrete viscosity reducer comprises the components of A (1, 4-butanediol monomethyl ether), B (glycerol polyoxyethylene ether trimethyl ether (c=5)), pentaerythritol polyoxyethylene ether (d=3) =70:20:10.
Comparative example 4 (A component a >7, R is-CH 2CH2CH2CH 3)
The concrete viscosity reducer consists of A (decanediol) B (glycerol polyoxyethylene ether (c=10)): pentaerythritol polyoxyethylene ether (d=3) =70:20:10.
Application examples
Application example 1
The viscosity reducer prepared in the examples 1-4 is mixed into mortar, and the mortar performance is tested, wherein the mortar test adopts P.O 42.5.5 cement 900g of small field cement, 1350g of standard sand, 135g of silica fume and 3.6g (0.2% relative to the mixing amount of the adhesive) of Su Bo special polycarboxylate superplasticizer; the blank mortar experiment adopts small field cement P.O 42.5.5 cement 900g, standard sand 1350g, silica fume 135g and Su Bo special polycarboxylate water reducer (50%wt) 3.6g; the water-gel ratio and the mixing amount of the viscosity reducer are shown in Table 1, the blank examples and the Su Bo special polycarboxylic acid water reducer which is mixed into the mortar of the viscosity reducer of examples 1-3 and comparative example 4 are PCA water reducer, and the Subo special polycarboxylic acid water reducer of example 4 is Su Bo special naphthalene sulfonate water reducer+aliphatic water reducer (reference 2:1, 40% mass concentration) 3.6g (0.2% relative to the mixing amount of the gel material).
TABLE 1 mortar Performance test after incorporation of the viscosity reducer of each example
Note that: t200 represents the time required for mortar to spread to 200mm
Table 1 shows that the viscosity reducing effect is better when the proportion of the dihydric alcohol and the derivative thereof is high, and the low molecular weight is beneficial to releasing the bound water among the components and the viscosity reducing effect; comparative examples show that when the molecular weight of the components is too high, the viscosity reducing effect is lost, and the effect is relatively small when the water-gel ratio is too high, the lower the water-gel ratio, the greater the adverse effect on the fluidity and back taper time. In comparative example 4, the water solubility of the A component is poor, the viscosity reduction effect is lost, and the EO chain segment of the B component is too long, so that the air entraining effect of the component is good, and the later strength of the low-water-gel-ratio concrete is not facilitated.
Application example 2
The viscosity reducers prepared in example 5 and example 6 were incorporated into concrete, and concrete experiments were performed using small field cement: 5.6kg; fly ash: 2.0kg; a marble: 13.2kg; small stone: 8.4kg; sand: 14.8kg; the water-gel ratio is 0.19/0.22 respectively; 18% of additive (15% of water reducing agent+3% of sodium sugar).
The viscosity reducer prepared in comparative examples 1 to 3 was incorporated into concrete, and concrete experiments were carried out using small field cement: 5.6kg; fly ash: 2.0kg; a marble: 13.2kg; small stone: 8.4kg; sand: 14.8kg; 38g of montmorillonite; the water-gel ratio is shown in Table 2;18% of additive (15% of water reducing agent+3% of sodium sugar).
Blank concrete experiments, which adopt small field cement: 5.6kg; fly ash: 2.0kg; a marble: 13.2kg; small stone: 8.4kg; sand: 14.8kg; the water-gel ratio is 0.19/0.22 respectively; 18% of additive (15% of water reducing agent+3% of sodium sugar).
Table 2 concrete test
Note that: t500 represents the time required for the concrete expansion of 500mm
From the data in Table 2, examples 3, 5 and 6 demonstrate that the combination is effective in reducing mortar in concrete, and that the viscosity reducing effect is better with higher A component and lower molecular weight component in the present invention. The reduced proportion of hydroxyl groups or the excessive molecular weight in the comparative example is unfavorable for exerting the viscosity reducing effect.
In comparative example 1, the product basically loses half of the viscosity reduction effect due to the monomethyl ether, and the glycerol polyoxyethylene ether is added in a large amount, so that the viscosity reduction effect is poor after the optimal dosage is exceeded.
The triol derivative of the A component in comparative example 2 lost the viscosity reducing effect due to glycerol polyoxyethylene ether trimethyl ether, and the overall viscosity reducing effect was deteriorated.
The compound used in comparative example 3 was a non-terminal hydroxyl group, and the lack of hydroxyl groups strived for the ability to bind water did not have a viscosity reducing effect in low water cement ratio concrete.
Claims (8)
1. The viscosity reducer for the low-water-gel-ratio concrete is characterized by comprising A, B, C components in percentage by mass (50-80): (30-20): (0-20) mixing and preparing;
the component A is selected from any one or a mixture of a plurality of small molecular dihydric alcohols and small molecular dihydric alcohol derivatives;
the component B is selected from any one or two of glycerol and glycerol polyoxyethylene ether derivatives and is mixed in any proportion;
the component C is pentaerythritol polyoxyethylene ether.
2. The viscosity reducer for low water-to-gel ratio concrete according to claim 1, wherein the small molecular dihydric alcohol in the component A is selected from any one or more of all linear and branched dihydric alcohols of C3-C8, and the small molecular dihydric alcohol derivative is selected from one or more of polyoxyethylene ether derivatives of linear/branched dihydric alcohols, and the small molecular dihydric alcohol derivative is mixed in any proportion.
3. The viscosity reducer for low water-cement ratio concrete according to claim 2, wherein the small molecular dihydric alcohol is selected from any one or more of diethylene glycol, triethylene glycol, tetraethylene glycol and monomers shown in a structural general formula (I) and is mixed in any proportion,
in the above general formula (I), wherein a=1 to 6, R is-H, -CH 3 、-CH 2 CH 3 or-CH (CH) 3 ) 2 。
4. The viscosity reducer for low water-cement ratio concrete according to claim 2, wherein the small molecular diol derivative has a general formula (II),
in the above general formula (II), a is 1 ＝1～6，b＝2～7，R 1 is-H, -CH 3 、-CH 2 CH 3 or-CH (CH) 3 ) 2 。
5. The viscosity reducer for low water-cement ratio concrete of claim 1, wherein the glycerol polyoxyethylene ether derivative of the component B has a structure represented by the following formula (iii), wherein c=2 to 7;
6. the viscosity reducer for low water-cement ratio concrete of claim 1, wherein the component C is pentaerythritol polyoxyethylene ether, and the structural general formula Is (IV), wherein d=2-7;
7. the method for using the viscosity reducer for low water-to-gel ratio concrete according to any one of claims 1 to 6, wherein the conventional mixing amount of the viscosity reducer is 0.2% -4% of the total gel material mass, and the mixing amount is pure solid mixing amount.
8. The method for applying the viscosity reducer to the low-water-to-gel-ratio concrete, according to claim 7, wherein the conventional mixing amount of the viscosity reducer is 0.5-2% of the mass of the total cementing material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210177262.XA CN116693231A (en) | 2022-02-25 | 2022-02-25 | Viscosity reducer for low-water-gel-ratio concrete and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210177262.XA CN116693231A (en) | 2022-02-25 | 2022-02-25 | Viscosity reducer for low-water-gel-ratio concrete and application thereof |
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| CN202210177262.XA Pending CN116693231A (en) | 2022-02-25 | 2022-02-25 | Viscosity reducer for low-water-gel-ratio concrete and application thereof |
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| CN (1) | CN116693231A (en) |
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