CN114804713A - Preparation method and application of polyaluminium sulfate modified accelerator - Google Patents
Preparation method and application of polyaluminium sulfate modified accelerator Download PDFInfo
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- CN114804713A CN114804713A CN202210388681.8A CN202210388681A CN114804713A CN 114804713 A CN114804713 A CN 114804713A CN 202210388681 A CN202210388681 A CN 202210388681A CN 114804713 A CN114804713 A CN 114804713A
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- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- 238000003756 stirring Methods 0.000 claims abstract description 31
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims abstract description 28
- 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 23
- 239000007788 liquid Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 19
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 239000002253 acid Substances 0.000 claims abstract description 16
- 239000002270 dispersing agent Substances 0.000 claims abstract description 16
- 239000011775 sodium fluoride Substances 0.000 claims abstract description 14
- 235000013024 sodium fluoride Nutrition 0.000 claims abstract description 14
- 239000011790 ferrous sulphate Substances 0.000 claims abstract description 13
- 235000003891 ferrous sulphate Nutrition 0.000 claims abstract description 13
- 229910001679 gibbsite Inorganic materials 0.000 claims abstract description 13
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 13
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims abstract description 13
- 239000000084 colloidal system Substances 0.000 claims abstract description 11
- 239000006185 dispersion Substances 0.000 claims abstract description 11
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001388 sodium aluminate Inorganic materials 0.000 claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 23
- 239000011378 shotcrete Substances 0.000 claims description 13
- 239000004113 Sepiolite Substances 0.000 claims description 5
- IPGANOYOHAODGA-UHFFFAOYSA-N dilithium;dimagnesium;dioxido(oxo)silane Chemical compound [Li+].[Li+].[Mg+2].[Mg+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O IPGANOYOHAODGA-UHFFFAOYSA-N 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 229910052624 sepiolite Inorganic materials 0.000 claims description 5
- 235000019355 sepiolite Nutrition 0.000 claims description 5
- 229910000329 aluminium sulfate Inorganic materials 0.000 claims description 4
- 235000011128 aluminium sulphate Nutrition 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 239000004567 concrete Substances 0.000 abstract description 9
- 238000001246 colloidal dispersion Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 8
- 230000015271 coagulation Effects 0.000 description 7
- 238000005345 coagulation Methods 0.000 description 7
- 239000003513 alkali Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 4
- 239000000391 magnesium silicate Substances 0.000 description 4
- 229910052919 magnesium silicate Inorganic materials 0.000 description 4
- 235000019792 magnesium silicate Nutrition 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005189 flocculation Methods 0.000 description 3
- 230000016615 flocculation Effects 0.000 description 3
- 125000003010 ionic group Chemical group 0.000 description 3
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- -1 aluminum ion Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 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 invention discloses a preparation method of a polyaluminium sulfate modified accelerator, which comprises the following steps: gradually and slowly adding an inorganic dispersant into water at room temperature, and uniformly mixing to obtain a cream-white colloid dispersion liquid; step two: dissolving sodium hydroxide in water according to a ratio, heating to 95 ℃, adding gibbsite powder for reaction to prepare a solution with the concentration of sodium aluminate of 70%, stopping heating, adding cold water for cooling and keeping the temperature constant at 50 ℃, adding tetraethoxysilane and ferrous sulfate under the condition of a stirring speed of 300r/min, and continuously stirring for 30min to obtain a modified polymeric silicic acid solution; step three: slowly adding the modified polysilicic acid solution into the emulsion-white colloidal dispersion liquid, adding sodium fluoride and the organic tackifier, uniformly mixing, heating to 75 ℃, adding aluminum sulfate, uniformly stirring, and carrying out heat preservation reaction for 1.5-3.0 hours to obtain the polyaluminum sulfate modified accelerator, so that the cement adaptability is effectively improved, and the concrete strength is improved.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a preparation method and application of a polyaluminium sulfate modified accelerator.
Background
The accelerator is a chemical additive capable of quickly setting cement, can set and harden the cement in a short time, and is mainly applied to engineering construction of sprayed concrete and sprayed mortar. In recent years, the wet concrete spraying process gradually replaces the traditional dry spraying process due to the advantages of good construction environment, low resilience, high construction efficiency and the like, and is widely applied.
The liquid accelerator commonly used for wet sprayed concrete at present comprises an alkaline liquid accelerator mainly comprising sodium silicate and sodium aluminate and a low-alkali (or alkali-free) liquid accelerator. The alkaline liquid accelerator has high alkali content, is poor in adaptability to different cements, is easy to damage the bodies of construction workers, and obviously reduces the later strength of sprayed concrete and the durability such as impermeability and the like after being mixed into concrete.
Disclosure of Invention
The invention aims to provide a preparation method of polyaluminium sulfate modified accelerator, which comprises the steps of mixing and proportioning sodium hydroxide, gibbsite, tetraethoxysilane and ferrous sulfate to prepare modified polysilicic acid solution, and compounding the modified polysilicic acid solution, aluminium sulfate, sodium fluoride and organic tackifier to realize Al 3+ 、Fe 2+ 、SO 4 2- The ionic groups of the Si group and the F group stably exist in the accelerator, so that the potential balance on the surface of cement particles is broken, the flocculation and coagulation effects of the cement particles are accelerated, the coagulation time is shortened, the cement adaptability is effectively improved, and the concrete strength is improved;
after the polyaluminium sulfate modified accelerator is doped into the cement, the hydration of particles in the slurry is promoted, more hydration products are formed, the porosity is reduced, and the microstructure is compacted, so that the permeability of a sample is improved.
The purpose of the invention can be realized by the following technical scheme:
a preparation method of a polyaluminium sulfate modified accelerator comprises the following steps:
the method comprises the following steps: gradually and slowly adding an inorganic dispersant into water at room temperature, and uniformly mixing to obtain a cream-white colloid dispersion liquid;
step two: dissolving sodium hydroxide in water according to a ratio, heating to 95 ℃, adding gibbsite powder for reaction to prepare a solution with the concentration of sodium aluminate of 70%, stopping heating, adding cold water for cooling and keeping the temperature constant at 50 ℃, adding tetraethoxysilane and ferrous sulfate under the condition of a stirring speed of 300r/min, and continuously stirring for 30min to obtain a modified polymeric silicic acid solution;
step three: slowly adding the modified polysilicic acid solution into the emulsion-white colloid dispersion liquid, stirring uniformly while adding, adding sodium fluoride and the organic tackifier, uniformly mixing, heating to 75 ℃, adding aluminum sulfate, stirring uniformly, and reacting for 1.5-3.0 hours at a constant temperature to obtain the polyaluminum sulfate modified accelerator.
As a further scheme of the invention: in the first step, the inorganic dispersant is prepared by mixing lithium magnesium silicate and sepiolite magnesium silicate in a mass ratio of 1: 1.
As a further scheme of the invention: the stirring speed in the first step is 600-.
As a further scheme of the invention: the mass ratio of the sodium hydroxide, the gibbsite, the ethyl orthosilicate and the ferrous sulfate is 0.5-0.7:0.8-1:0.3-0.5: 0.1-0.3.
As a further scheme of the invention: the purity of the tetraethoxysilane is more than or equal to 99 percent.
As a further scheme of the invention: the mass ratio of the aluminum sulfate to the modified polysilicic acid solution to the sodium fluoride to the organic tackifier to the inorganic dispersant is 4-6:4-6:1-3: 0.5-0.7: 1.2-1.4.
As a further scheme of the invention: the organic tackifier in the third step is polyacrylamide.
As a further scheme of the invention: adding the aluminum sulfate in the third step for multiple times in the adding process, wherein the adding times are not less than three times.
As a further scheme of the invention: the application of the polyaluminium sulfate modified accelerator is suitable for sprayed concrete, and the dosage of the polyaluminium sulfate modified accelerator is 6-8 wt% of the dosage of cement of the sprayed concrete.
The invention has the beneficial effects that:
(1) the invention mixes and matches sodium hydroxide, gibbsite, ethyl orthosilicate and ferrous sulfate to prepare modified polysilicic acid solution, and then compounds the modified polysilicic acid solution with aluminum sulfate, sodium fluoride and organic tackifier to realize Al 3+ 、Fe 2+ 、SO 4 2- The ionic groups of the Si group and the F group stably exist in the accelerator, so that the potential balance on the surface of cement particles is broken, the flocculation and coagulation effects of the cement particles are accelerated, the coagulation time is shortened, the cement adaptability is effectively improved, and the concrete strength is improved;
(2) the polyaluminium sulfate modified accelerator has good synergistic effect with Portland cement, can effectively promote the hydration of particles in slurry, form more hydration products, reduce the porosity and compact the microstructure, thereby improving the permeability of a sample, and can further improve the early strength and the later strength of sprayed concrete and reduce the function of early setting time of the concrete when being applied to the sprayed concrete.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a polyaluminium sulfate modified accelerator comprises the following steps:
the method comprises the following steps: gradually and slowly adding an inorganic dispersant into water at room temperature, and uniformly mixing to obtain a cream-white colloid dispersion liquid;
wherein the inorganic dispersant is prepared by mixing lithium magnesium silicate and sepiolite magnesium silicate in a mass ratio of 1:1, stirring at room temperature of 25 ℃ and a rotation speed of 700r/min for 60 min;
step two: dissolving sodium hydroxide in water according to a ratio, heating to 95 ℃, adding gibbsite powder for reaction to prepare a solution with the concentration of sodium aluminate of 70%, stopping heating, adding cold water for cooling and keeping the temperature constant at 50 ℃, adding tetraethoxysilane and ferrous sulfate under the condition of a stirring speed of 300r/min, and continuously stirring for 30min to obtain a modified polymeric silicic acid solution;
wherein the mass ratio of the sodium hydroxide, the gibbsite, the ethyl orthosilicate and the ferrous sulfate is 0.6:0.9:0.4: 0.2;
step three: slowly adding the modified polysilicic acid solution into the emulsion-white colloid dispersion liquid, stirring uniformly while adding, adding sodium fluoride and an organic tackifier, uniformly mixing, heating to 75 ℃, adding aluminum sulfate, stirring uniformly, and reacting for 1.5-3.0 hours at a constant temperature to obtain the polyaluminum sulfate modified accelerator;
the mass ratio of the aluminum sulfate to the modified polysilicic acid solution to the sodium fluoride to the organic tackifier to the inorganic dispersant is 5:5:2: 0.6: 1.3.
the purity of the ethyl orthosilicate in the second step is more than or equal to 99%.
The organic tackifier in the third step is polyacrylamide.
Adding aluminum sulfate in the third step for multiple times in the adding process, wherein the adding times are not less than three times, and stirring the solution at 500r/min in each adding process.
Example 2
A preparation method of a polyaluminium sulfate modified accelerator comprises the following steps:
the method comprises the following steps: gradually and slowly adding an inorganic dispersant into water at room temperature, and uniformly mixing to obtain a cream-white colloid dispersion liquid;
in the first step, the inorganic dispersant is prepared by mixing lithium magnesium silicate and sepiolite magnesium silicate in a mass ratio of 1:1, and the mixture is stirred at the room temperature of 25 ℃ and the rotating speed of 700r/min for 60 min;
step two: dissolving sodium hydroxide in water according to a ratio, heating to 95 ℃, adding gibbsite powder for reaction to prepare a solution with the concentration of sodium aluminate of 70%, stopping heating, adding cold water for cooling and keeping the temperature constant at 50 ℃, adding tetraethoxysilane and ferrous sulfate under the condition of a stirring speed of 300r/min, and continuously stirring for 30min to obtain a modified polymeric silicic acid solution;
wherein the mass ratio of the sodium hydroxide, the gibbsite, the ethyl orthosilicate and the ferrous sulfate is 0.5:0.8:0.3: 0.1;
step three: slowly adding the modified polysilicic acid solution into the emulsion-white colloid dispersion liquid, stirring uniformly while adding, adding sodium fluoride and an organic tackifier, uniformly mixing, heating to 75 ℃, adding aluminum sulfate, stirring uniformly, and reacting for 1.5-3.0 hours at a constant temperature to obtain the polyaluminum sulfate modified accelerator;
wherein the mass ratio of the aluminum sulfate, the modified polysilicic acid solution, the sodium fluoride, the organic tackifier to the inorganic dispersant is 4: 4: 1:0.5: 1.2;
the purity of the ethyl orthosilicate in the second step is more than or equal to 99%.
The organic tackifier in the third step is polyacrylamide.
Adding aluminum sulfate in the third step for multiple times in the adding process, wherein the adding times are not less than three times, and stirring the solution at 500r/min in each adding process.
Example 3
The preparation method of the polyaluminium sulfate modified accelerator is characterized by comprising the following steps of:
the method comprises the following steps: gradually and slowly adding an inorganic dispersant into water at room temperature, and uniformly mixing to obtain a cream-white colloid dispersion liquid;
wherein the inorganic dispersant is prepared by mixing lithium magnesium silicate and sepiolite magnesium silicate in a mass ratio of 1:1, stirring at room temperature of 25 ℃ and a rotation speed of 700r/min for 60 min;
step two: dissolving sodium hydroxide in water according to a ratio, heating to 95 ℃, adding gibbsite powder for reaction to prepare a solution with the concentration of sodium aluminate of 70%, stopping heating, adding cold water for cooling and keeping the temperature constant at 50 ℃, adding tetraethoxysilane and ferrous sulfate under the condition of a stirring speed of 300r/min, and continuously stirring for 30min to obtain a modified polymeric silicic acid solution;
wherein the mass ratio of the sodium hydroxide, the gibbsite, the ethyl orthosilicate and the ferrous sulfate is 0.7:1:0.5: 0.3;
step three: slowly adding the modified polysilicic acid solution into the emulsion-white colloid dispersion liquid, stirring uniformly while adding, adding sodium fluoride and an organic tackifier, uniformly mixing, heating to 75 ℃, adding aluminum sulfate, stirring uniformly, and reacting for 1.5-3.0 hours at a constant temperature to obtain the polyaluminum sulfate modified accelerator;
wherein the mass ratio of the aluminum sulfate to the modified polysilicic acid solution to the sodium fluoride to the organic tackifier to the inorganic dispersant is 6:6:3: 0.7: 1.4;
the purity of the ethyl orthosilicate in the second step is more than or equal to 99%.
The organic tackifier in the third step is polyacrylamide.
Adding aluminum sulfate in the third step for multiple times in the adding process, wherein the adding times are not less than three times, and stirring the solution at 500r/min in each adding process.
Example 4
The application of the polyaluminium sulfate modified accelerator is characterized in that the polyaluminium sulfate modified accelerator is suitable for sprayed concrete, and the mixing amount of the accelerator is 6-8 wt% of the cement amount of the sprayed concrete;
the amount of the polyaluminium sulfate-modified accelerator blended in examples 1 to 3 is preferably 7% by weight.
Comparative example 1
The method adopts a patent number of CN102219426B, a low-alkali liquid accelerating agent and a preparation method thereof, and comprises the following steps: the low-alkali liquid accelerating agent consists of aluminum sulfate, sodium aluminate, a stabilizer and water; the weight percentage of each component is as follows: 0-60% of aluminum sulfate, 6-12% of sodium aluminate, 0-0.2% of stabilizer and the balance of water; the low-alkali liquid accelerator is prepared by neutralizing an aluminum sulfate solution and a sodium aluminate solution to generate an aluminum hydroxide sol, and polymerizing aluminum sulfate with the aluminum hydroxide sol in an original solution system to form polyaluminum sulfate, so that the accelerator solution has high aluminum ion content and liquid stability.
The setting time of the accelerator paste, the 1d compressive strength of the mortar and the 28d compressive strength ratio of the mortar are tested by referring to GB35159-2017< accelerator for shotcrete > standard for the setting time of the accelerator paste, the 1d compressive strength of the mortar and the 28d compressive strength ratio of the concrete of examples 1-3 and comparative example 1:
the test results are shown in the following table:
| initial setting/min | Final set/min | 1d stress resistance/MPa | 28d compressive stress/MPa | |
| Example 1 | 1:25 | 2:54 | 13.5 | 123 |
| Example 2 | 1:40 | 3:26 | 12.7 | 116 |
| Example 3 | 1:30 | 3:15 | 13.2 | 121 |
| Comparative example 1 | 2:35 | 4:35 | 12.6 | 117 |
The detection of the polyaluminium sulfate modified accelerator on different cement properties can be obtained through the above table, and it can be seen that the cement can be rapidly coagulated and hardened under the condition of the doping amount of 7 wt%, and the coagulation time and the 1d compressive strength both meet the requirements of the industry standard GB/T35159-2017 accelerator for sprayed concrete;
compared with comparative example 1, the polyaluminium sulfate modified accelerator is shown to realize Al through compounding the modified polysilicic acid solution with aluminium sulfate, sodium fluoride and organic tackifier 3+ 、Fe 2+ 、SO 4 2- The ionic groups of the Si group and the F group stably exist in the accelerator, so that the potential balance on the surface of cement particles is more favorably broken, the flocculation and coagulation effects of the cement particles are accelerated, the coagulation time is shortened, the cement adaptability is effectively improved, the concrete strength is improved, and the 1d compressive strength and the 28d compressive strength are both obviously improved.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. The preparation method of the polyaluminium sulfate modified accelerator is characterized by comprising the following steps of:
the method comprises the following steps: gradually and slowly adding an inorganic dispersant into water at room temperature, and uniformly mixing to obtain a cream-white colloid dispersion liquid;
step two: dissolving sodium hydroxide in water according to a ratio, heating to 95 ℃, adding gibbsite powder for reaction to prepare a solution with the concentration of sodium aluminate of 70%, stopping heating, adding cold water for cooling and keeping the temperature constant at 50 ℃, adding tetraethoxysilane and ferrous sulfate under the condition of a stirring speed of 300r/min, and continuously stirring for 30min to obtain a modified polymeric silicic acid solution;
step three: slowly adding the modified polysilicic acid solution into the emulsion-white colloid dispersion liquid, stirring uniformly while adding, adding sodium fluoride and the organic tackifier, uniformly mixing, heating to 75 ℃, adding aluminum sulfate, stirring uniformly, and reacting for 1.5-3.0 hours at a constant temperature to obtain the polyaluminum sulfate modified accelerator.
2. The method for preparing polyaluminium sulfate modified accelerator as claimed in claim 1, wherein the inorganic dispersant in the first step is prepared by mixing lithium magnesium silicate and magnesium sepiolite silicate in a mass ratio of 1: 1.
3. The method as claimed in claim 1, wherein the stirring speed in step one is 600-800r/min, and the stirring time is 30-60 min.
4. The method for preparing polyaluminium sulfate modified accelerator as claimed in claim 1, wherein the mass ratio of sodium hydroxide, gibbsite, ethyl orthosilicate and ferrous sulfate is 0.5-0.7:0.8-1:0.3-0.5: 0.1-0.3.
5. The method for preparing polyaluminium sulfate modified accelerator according to claim 1, wherein the purity of the tetraethoxysilane is not less than 99%.
6. The method for preparing the polyaluminium sulfate modified accelerator as claimed in claim 1, wherein the mass ratio of the aluminium sulfate, the modified polysilicic acid solution, the sodium fluoride, the organic tackifier and the inorganic dispersant is 4-6:4-6:1-3: 0.5-0.7: 1.2-1.4.
7. The method for preparing polyaluminium sulfate modified accelerator according to claim 1, wherein the organic tackifier in step three is polyacrylamide.
8. The method for preparing the polyaluminium sulfate modified accelerator as claimed in claim 1, wherein the aluminium sulfate in the third step is added for a plurality of times in the adding process, and the adding times are not less than three times.
9. The use of the polyaluminium sulfate-modified accelerator as claimed in any one of claims 1 to 8, wherein the polyaluminium sulfate-modified accelerator is suitable for sprayed concrete and is added in an amount of 6 to 8 wt% based on the cement content of the sprayed concrete.
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Application publication date: 20220729 |