CN112456853A - High-strength alkali-free liquid accelerator and preparation method thereof - Google Patents
High-strength alkali-free liquid accelerator and preparation method thereof Download PDFInfo
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- CN112456853A CN112456853A CN202011490317.XA CN202011490317A CN112456853A CN 112456853 A CN112456853 A CN 112456853A CN 202011490317 A CN202011490317 A CN 202011490317A CN 112456853 A CN112456853 A CN 112456853A
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- 239000007788 liquid Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 21
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 21
- -1 alcohol amine compound Chemical class 0.000 claims abstract description 17
- 239000002270 dispersing agent Substances 0.000 claims abstract description 17
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 12
- 239000011737 fluorine Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 23
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 12
- 229920002367 Polyisobutene Polymers 0.000 claims description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 229920000620 organic polymer Polymers 0.000 claims description 7
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 5
- 238000005345 coagulation Methods 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 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000391 magnesium silicate Substances 0.000 claims description 3
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 3
- 235000019792 magnesium silicate Nutrition 0.000 claims description 3
- 230000001737 promoting effect Effects 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 10
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 11
- 239000004568 cement Substances 0.000 description 10
- 239000003513 alkali Substances 0.000 description 9
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000011378 shotcrete Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004115 Sodium Silicate Substances 0.000 description 3
- 239000000701 coagulant Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000006072 paste Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 3
- 229910052911 sodium silicate Inorganic materials 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 206010003549 asthenia Diseases 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-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
- 229920002125 Sokalan® Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229940009868 aluminum magnesium silicate Drugs 0.000 description 1
- WMGSQTMJHBYJMQ-UHFFFAOYSA-N aluminum;magnesium;silicate Chemical compound [Mg+2].[Al+3].[O-][Si]([O-])([O-])[O-] WMGSQTMJHBYJMQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- DGVMNQYBHPSIJS-UHFFFAOYSA-N dimagnesium;2,2,6,6-tetraoxido-1,3,5,7-tetraoxa-2,4,6-trisilaspiro[3.3]heptane;hydrate Chemical compound O.[Mg+2].[Mg+2].O1[Si]([O-])([O-])O[Si]21O[Si]([O-])([O-])O2 DGVMNQYBHPSIJS-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 239000002699 waste material Substances 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
-
- 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
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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 high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass: aluminum sulfate: 14% -30%; fluorine-containing acid: 5% -10%; aluminum hydroxide: 5% -9%; alcohol amine compound: 2% -7%; organic high-molecular coagulation-promoting component: 10% -20%; dispersing agent: 0.5% -2%; water: the balance; the sum of the mass percentages of the components is 100 percent; the invention also comprises a preparation method of the accelerating agent. The high-strength alkali-free liquid accelerator has stable property and good accelerating effect; when the concrete admixture is used in concrete, the setting time is short, the early strength is high, the later strength retention rate is high, and the injection resilience rate is low; the method can be widely applied to supporting, leaking stoppage and repairing of tunnels, highways, railways, mines and subways.
Description
Technical Field
The invention relates to an accelerator and a preparation method thereof, in particular to an alkali-free liquid accelerator and a preparation method thereof.
Background
The accelerator is a chemical admixture capable of rapidly setting and hardening cement paste, mortar or concrete without excessively affecting the long-term strength thereof. Since the production and use of the quick-setting admixture, the quick-setting admixture has become one of important constituent materials of the shotcrete by virtue of the remarkable characteristics in the aspects of quick setting and early strength. Particularly, with the increase of the number of underground projects and the large scale, the accelerator is more and more important as a concrete composition material and is indispensable in certain specific projects, so that the accelerator is widely applied to anchor-shotcreting support of projects such as mine roadways and tunnels, and projects such as plugging and rush-repair.
The accelerator is widely available in various types, and can be roughly classified into four types, i.e., alkaline powder, alkaline liquid, alkali-free (low alkali) powder, and alkali-free (low alkali) liquid, depending on the nature and state. The alkaline powdery accelerator and the alkaline liquid accelerator have the following problems in the construction process: firstly, the later strength loss of the cement concrete is large; secondly, the high alkali content can damage the health of constructors, and the excessive alkali content can cause the alkali aggregate reaction of the concrete, thereby greatly reducing the strength and durability of the concrete; thirdly, the rebound quantity of the concrete after construction is large and the wet operation is not facilitated. Although the later strength loss of the alkali-free (low-alkali) powdery accelerator is relatively small, the defects of uneven mixing, large dust and the like generally exist in the using process, and the accelerating effect of the alkali-free (low-alkali) powdery accelerator is seriously influenced after the alkali-free (low-alkali) powdery accelerator is wetted. The alkali-free liquid accelerator solves the problems well, has the advantages of no corrosion, high later strength retention rate, safety, no pollution and the like, but the existing alkali-free liquid accelerator generally has the problems of poor stability, strong acidity, large loss of later mechanical property and durability of concrete caused by low-alkali accelerators mainly comprising aluminate and the like.
CN109824294A discloses a high-strength stable liquid accelerator and a preparation method thereof, wherein the liquid accelerator at least comprises the following preparation raw materials by weight: 20-40 parts of aluminum hydroxide; 1-10 parts of ammonia water; 5-15 parts of a complexing reinforcing agent; 0.5-3% of a stabilizer; 1-5 parts of aluminum magnesium silicate; the balance of water. The technical scheme takes aluminum hydroxide as a raw material to provide aluminum ions, and the stabilizer is formed by polymerizing a fluorine-containing compound and acrylic acid, and has the defects that: the aluminum hydroxide is insoluble in water, and when the dosage is too large, the obtained accelerator has poor stability, the odor of ammonia water is heavy, the health of constructors is influenced, and the accelerator also has adverse effect on the accelerating effect.
CN110128044A discloses a preparation method of an alkali-free liquid accelerator, which comprises the following components in percentage by mass: 35-40% of aluminum sulfate, 25-33% of waste liquid from production of phosphate fertilizer containing fluosilicic acid, 12-16% of aluminum hydroxide, 2-3% of sodium silicate and the balance of water, wherein the sum of the components is 100%. According to the scheme, aluminum sulfate and soluble aluminum trifluoride are used as main components, sodium silicate supplements the coagulation accelerating effect, the alkali-free liquid accelerator is prepared, the final product contains silicon dioxide, the sedimentation is easy, the sodium silicate is almost insoluble in an acid system, and the stability of the obtained accelerator is poor.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provide a high-strength alkali-free liquid accelerator with low cost, good stability and good accelerating effect and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 14% -30%;
fluorine-containing acid: 5% -10%;
aluminum hydroxide: 5% -9%;
alcohol amine compound: 2% -7%;
organic high-molecular coagulation-promoting component: 10% -20%; (ii) a
Dispersing agent: 0.4% -2.5%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
Preferably, the high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 15% -25%;
fluorine-containing acid: 6 to 8 percent;
aluminum hydroxide: 6 to 8 percent;
alcohol amine compound: 3% -5%;
organic high-molecular coagulation-promoting component: 12 to 18 percent;
dispersing agent: 0.50% -2.2%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
Preferably, the fluorine-containing acid is one of hydrofluoric acid, fluosilicic acid and a mixed acid of hydrofluoric acid and fluosilicic acid, and the mass concentration of solute in the fluorine-containing acid is 28-40%.
Preferably, the alkanolamine compound is one or more than two of diethanolamine, triethanolamine, triisopropanolamine and diethanolisopropanolamine.
Preferably, the organic polymer coagulation-promoting component is polyisobutylene and/or polyvinyl alcohol.
Preferably, the relative molecular weight of the organic high-molecular coagulation-promoting component is 5000-8000.
Preferably, the dispersant is any one of hydrated magnesium silicate, polyethylene glycol and polyacrylamide.
The preparation method of the high-strength alkali-free liquid accelerator comprises the following steps:
(1) mixing water and fluorine-containing acid in a reaction vessel, stirring, adding aluminum hydroxide, and reacting under heat preservation to obtain a soluble fluorine aluminum compound;
(2) adding aluminum sulfate, organic polymer coagulation promoting components and alcohol amine compounds into the reaction container in the step (1) under the condition of stirring for heat preservation reaction; cooling, adding a dispersing agent, and carrying out heat preservation reaction; cooling to room temperature to obtain the final product.
Preferably, in the step (1), the stirring speed is 3000-5000 r/min.
Preferably, in the step (1), the temperature of the heat preservation reaction is 60-70 ℃, and the time of the heat preservation reaction is 2-4 hours.
Preferably, in the step (2), the stirring speed is 5000-8000 rpm.
Preferably, in the step (1), aluminum sulfate, the organic polymer coagulation-promoting component and the alcohol amine compound are added to react at the reaction temperature of 50-60 ℃ for 2-2.5 hours.
Preferably, in the step (1), the reaction temperature after cooling and adding the dispersing agent is 30-35 ℃, and the reaction time is 30-60 min.
The dosage of the accelerator used in the sprayed concrete is 6-9 wt% of the mass of the concrete cementing material.
The invention has the following beneficial effects:
(1) the invention uses organic high molecular coagulant, such as polyacrylic acid, polyisobutylene and polyvinyl alcohol, as alkali-free liquid coagulant; the viscosity of concrete spraying materials is obviously changed by utilizing the physical properties of high polymer materials, the steric hindrance effect of an accelerator system is enhanced, and the effects of quickly condensing sprayed concrete and improving the early and later strength of the concrete are achieved;
(2) the organic high-molecular coagulant is easy to dissolve and neutral, does not contain harmful ions, is more environment-friendly, has good adaptability to cement, can effectively improve the thickness of a sprayed layer, can improve the durability of cement concrete, and is suitable for various construction processes;
(3) the prepared alkali-free accelerator has good long-term stability and 24 months of stability for storage in class under the normal temperature condition by utilizing the synergistic thickening and dispersing effects between the organic high-molecular accelerator and the dispersing agent;
(4) the accelerator disclosed by the invention has the advantages of short condensation time, high early strength, high retention rate of later strength and low injection resilience rate, and can be widely applied to supporting, leaking stoppage, repairing and the like of tunnels, highways, railways, mines and subways.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The starting materials used in the examples of the present invention were all obtained from conventional commercial sources.
Example 1
The high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 15.9 percent;
fluosilicic acid: 7.5 percent;
aluminum hydroxide: 6.2 percent;
alcamines (triethanolamine): 3.4 percent;
organic high-molecular accelerating component (polyisobutylene): 12.4 percent;
dispersing agent: (polyacrylamide) 0.5%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
The preparation method of the high-strength alkali-free liquid accelerator comprises the following steps:
(1) adding 83.00g of fluosilicic acid and 615.80g of water into a reaction kettle, starting a stirring device, keeping stirring all the time in the step (1), controlling the rotation speed to be 3000 r/min, controlling the temperature in the reaction kettle to be 65 ℃, adding 78.00g of aluminum hydroxide twice, and keeping the temperature for reaction for 2 hours to obtain a soluble aluminum fluoride compound;
(2) adjusting the rotating speed of a stirring device to 8000 rpm and keeping the speed in the step (2), adding 181.00g of aluminum sulfate, 41.00g of triethanolamine and 145g of polyisobutene into the reaction kettle in the step (1), and keeping the temperature at 55 ℃ for reaction for 2.5 hours; cooling to 30 ℃ and preserving heat, adding 9.55g of polyacrylamide, reacting for 30min, and cooling to room temperature.
Example 2
The high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 18.2 percent;
fluosilicic acid: 6.7 percent;
aluminum hydroxide: 6.6 percent;
alcamines (triisopropanolamine): 4.5 percent;
organic high-molecular accelerating component (polyvinyl alcohol): 16.8 percent;
dispersing agent: (polyethylene glycol) 1.1%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
The preparation method of the high-strength alkali-free liquid accelerator comprises the following steps:
(1) adding 80.00g of fluosilicic acid and 582.60g of water into a reaction kettle, starting a stirring device, keeping stirring all the time in the step (1), controlling the rotation speed to be 4000 rpm, controlling the temperature in the reaction kettle to be 60 ℃, adding 78.00g of aluminum hydroxide twice, and keeping the temperature to react for 3 hours to obtain a soluble aluminum fluoride compound;
(2) adjusting the rotating speed of a stirring device to 6000 rpm and keeping the speed in the step (2), adding 230.00g of aluminum sulfate, 201.00g of polyvinyl alcohol and 53.00g of triisopropanolamine into the reaction kettle in the step (1), and keeping the temperature at 40 ℃ for reaction for 2.5 hours; cooling to 30 deg.C, keeping the temperature, adding 13.00g polyethylene glycol, reacting for 30min, and cooling to room temperature.
Example 3
The high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 20.2 percent;
hydrofluoric acid: 7.7 percent;
aluminum hydroxide: 6.9 percent;
alkanolamine compound (diethanolamine): 4.4 percent;
organic high-molecular accelerating component (polyvinyl alcohol): 15.1 percent;
dispersing agent: (magnesium silicate hydrate) 1.9%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
The preparation method of the high-strength alkali-free liquid accelerator comprises the following steps:
(1) adding 92.00g of hydrofluoric acid and 548.6g of bottom water into a reaction kettle, starting a stirring device, keeping stirring all the time in the step (1), controlling the rotation speed to be 5000 r/min, controlling the temperature in the reaction kettle to be 60 ℃, adding 83.00g of aluminum hydroxide twice, and carrying out heat preservation reaction for 2.5 hours to obtain a soluble aluminum fluoride compound;
(2) adjusting the rotating speed of the stirring device to 7000 rpm and keeping the speed in the step (2), adding 253.00g of aluminum sulfate, 181.00g of polyvinyl alcohol and 54.00g of diethanolamine into the reaction kettle in the step (1), and keeping the temperature at 45 ℃ for reaction for 2 hours; cooling to 35 deg.C, keeping the temperature, adding 21.00g of hydrated magnesium silicate, reacting for 30min, and cooling to room temperature.
Example 4
The high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 22.6 percent;
hydrofluoric acid: 7.3 percent;
aluminum hydroxide: 7.8 percent;
alkanolamines (diethanolisopropanolamine): 4.3 percent;
organic high-molecular accelerating component (polyisobutylene): 16.7 percent;
dispersing agent: (polyethylene glycol) 1.2%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
The preparation method of the high-strength alkali-free liquid accelerator comprises the following steps:
(1) adding 86.00g of hydrofluoric acid and 486.20g of bottom water into a reaction kettle, starting a stirring device, keeping stirring all the time in the step (1), controlling the rotation speed to be 4000 rpm, controlling the temperature in the reaction kettle to be 55 ℃, adding 91.00g of aluminum hydroxide twice, and carrying out heat preservation reaction for 3 hours to obtain a soluble aluminum fluoride compound;
(2) adjusting the rotating speed of a stirring device to 5000 rpm and keeping the speed in the step (2), adding 274.00g of aluminum sulfate, 192.00g of polyisobutene and 52.00g of diethanol monoisopropanolamine into the reaction kettle in the step (1), and keeping the temperature at 40 ℃ for reaction for 2.5 hours; cooling to 30 deg.C, keeping the temperature, adding 26.00g polyethylene glycol, reacting for 30min, and cooling to room temperature.
Example 5
The high-strength alkali-free liquid accelerator comprises the following raw materials in percentage by mass:
aluminum sulfate: 17.5 percent;
fluosilicic acid: 7.1 percent;
aluminum hydroxide: 7.3 percent;
alcamines (triethanolamine): 3.9 percent;
organic polymer accelerating component 1 (polyisobutylene): 6.2 percent;
organic polymer accelerating component 2 (polyvinyl alcohol): 7.2 percent;
dispersing agent: (polyacrylamide) 0.6%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
The preparation method of the high-strength alkali-free liquid accelerator comprises the following steps:
(1) adding 85.00g of fluosilicic acid and 599.50g of water into a reaction kettle, starting a stirring device, keeping stirring all the time in the step (1), controlling the rotation speed to be 3000 r/m, controlling the temperature in the reaction kettle to be 60 ℃, adding 87.00g of aluminum hydroxide twice, and keeping the temperature to react for 3.5 hours to obtain a soluble aluminum fluoride compound;
(2) adjusting the rotating speed of a stirring device to 6000 rpm and keeping the speed in the step (2), adding 209.00g of aluminum sulfate, 74.00g of polyisobutylene, 85.00g of polyvinyl alcohol and 46.00g of triethanolamine into the reaction kettle in the step (1), and keeping the temperature at 45 ℃ for reaction for 2 hours; cooling to 35 deg.C, keeping the temperature, adding 7.10g polyacrylamide, reacting for 30min, and cooling to room temperature.
Detection and analysis
The high-strength alkali-free liquid accelerator prepared in the embodiment 1-5 is tested according to the following relevant standards:
GB T8077-2012 test method for homogeneity of concrete admixture;
GBT 35159 and 2017 accelerator for shotcrete.
The high-strength alkali-free liquid setting accelerator prepared in the embodiment 1-5 and a currently-sold alkali-free liquid setting accelerator (sample 1 purchased from a certain factory in the north of lake) are subjected to a comparison test, wherein the comparison test comprises a primary and final setting time test and a compressive strength test of cement mortar, wherein the primary and final setting time test and the compressive strength test are carried out on the liquid alkali-free setting accelerator according to the standard 'GBT 35159-2017 accelerator for shotcrete';
the materials used for the setting time test were: 400g of cement, 140g of water (containing water contained in the alkali-free liquid accelerator), wherein the mixing amount of the alkali-free liquid accelerator is 6 percent of the cement;
the materials used in the compressive strength test are as follows: 900g of cement, 450g of water (containing water of the alkali-free liquid accelerator) and 1350g of standard sand, wherein the doping amount of the alkali-free liquid accelerator is 6 percent of the cement;
the test results of cement paste setting time, mortar strength and stability are shown in tables 1 and 2.
TABLE 1 Cement paste setting time test results
TABLE 2 Cement mortar Strength testing and stability
As can be seen from tables 1 and 2, the high-strength alkali-free liquid accelerator has shorter initial setting time and final setting time than the commercial products, higher retention rate of 1d compressive strength, 28d compressive strength and 90d compressive strength and better stability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, so that any modifications, equivalents and improvements made by the present invention as described in the specification are included in the scope of the present invention.
Claims (10)
1. A high-strength alkali-free liquid accelerator is characterized by comprising the following raw materials in percentage by mass:
aluminum sulfate: 14% -30%;
fluorine-containing acid: 5% -10%;
aluminum hydroxide: 5% -9%;
alcohol amine compound: 2% -7%;
organic high-molecular coagulation-promoting component: 10% -20%;
dispersing agent: 0.5% -2%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
2. The high-strength alkali-free liquid accelerator as claimed in claim 1, wherein the mass fractions of the raw materials are as follows:
aluminum sulfate: 15% -25%;
fluorine-containing acid: 6% -8%;
aluminum hydroxide: 6% -8%;
alcohol amine compound: 3% -5%;
organic high-molecular coagulation-promoting component: 12% -18%;
dispersing agent: 0.50% -2%;
water: the balance;
the sum of the mass percentages of the components is 100 percent.
3. A high-strength alkali-free liquid accelerator as set forth in claim 1 or 2, wherein the fluorine-containing acid is one of hydrofluoric acid, fluorosilicic acid, and a mixed acid of hydrofluoric acid and fluorosilicic acid, and the mass concentration of the solute in the fluorine-containing acid is 28-40%.
4. A strong alkali-free liquid accelerator as set forth in any one of claims 1 to 3 wherein the alkanolamine compound is one or more than two of diethanolamine, triethanolamine, triisopropanolamine and diethanolisopropanolamine.
5. A strong alkali-free liquid accelerator as claimed in any one of claims 1 to 4, wherein the organic high molecular coagulation accelerator component is polyisobutylene and/or polyvinyl alcohol.
6. A strong alkali-free liquid accelerator as claimed in any one of claims 1 to 5, wherein the organic polymeric accelerating component has a relative molecular weight of 5000 to 8000.
7. A strong alkali-free liquid accelerator as set forth in any one of claims 1 to 6 wherein said dispersant is any one of hydrous magnesium silicate, polyethylene glycol and polyacrylamide.
8. A preparation method of the high-strength alkali-free liquid accelerator as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
(1) mixing water and fluorine-containing acid in a reaction vessel, stirring, adding aluminum hydroxide, and reacting under heat preservation to obtain a soluble fluorine aluminum compound;
(2) adding aluminum sulfate, organic polymer coagulation promoting components and alcohol amine compounds into the reaction container in the step (1) under the condition of stirring for heat preservation reaction; cooling, adding a dispersing agent, and carrying out heat preservation reaction; cooling to room temperature to obtain the final product.
9. The preparation method of the high-strength alkali-free liquid accelerator as claimed in claim 8, wherein in the step (1), the stirring speed is 3000-5000 r/min; the temperature of the heat preservation reaction is 60-70 ℃, and the time of the heat preservation reaction is 2-4 hours.
10. The preparation method of the high-strength alkali-free liquid accelerator as claimed in claim 8 or 9, wherein in the step (2), the stirring speed is 5000-8000 rpm; adding aluminum sulfate, an organic polymer coagulation accelerating component and an alcohol amine compound to react at the reaction temperature of 50-60 ℃ for 2-2.5 hours; the reaction temperature after cooling and adding the dispersing agent is 30-35 ℃, and the reaction time is 30-60 min.
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