CN115819006B - Method for preparing alkali-free liquid accelerator by using suspension - Google Patents
Method for preparing alkali-free liquid accelerator by using suspension Download PDFInfo
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- 239000000725 suspension Substances 0.000 title claims abstract description 38
- 239000007788 liquid Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000002121 nanofiber Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 25
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 17
- -1 alcohol amine Chemical class 0.000 claims description 15
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 10
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000004094 surface-active agent Substances 0.000 claims description 9
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 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 description 6
- 239000000391 magnesium silicate Substances 0.000 claims description 6
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 6
- 150000005846 sugar alcohols Polymers 0.000 claims description 6
- HZAXFHJVJLSVMW-UHFFFAOYSA-N 2-Aminoethan-1-ol Chemical compound NCCO HZAXFHJVJLSVMW-UHFFFAOYSA-N 0.000 claims description 4
- PPQREHKVAOVYBT-UHFFFAOYSA-H dialuminum;tricarbonate Chemical compound [Al+3].[Al+3].[O-]C([O-])=O.[O-]C([O-])=O.[O-]C([O-])=O PPQREHKVAOVYBT-UHFFFAOYSA-H 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 3
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 claims description 2
- 150000008052 alkyl sulfonates Chemical class 0.000 claims description 2
- 229940118662 aluminum carbonate Drugs 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
- 239000004711 α-olefin Substances 0.000 claims description 2
- 239000004570 mortar (masonry) Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 13
- 239000004568 cement Substances 0.000 description 8
- 230000036571 hydration Effects 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 8
- 238000002360 preparation method Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 235000019792 magnesium silicate Nutrition 0.000 description 5
- ZADYMNAVLSWLEQ-UHFFFAOYSA-N magnesium;oxygen(2-);silicon(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Si+4] ZADYMNAVLSWLEQ-UHFFFAOYSA-N 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000012452 mother liquor Substances 0.000 description 2
- 239000010413 mother solution Substances 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 150000001860 citric acid derivatives Chemical class 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000006174 pH buffer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to the technical field of building materials, in particular to a method for preparing an alkali-free liquid accelerator by using a suspension, wherein the suspension is combined with nanofibers, so that the condition that the alkali-free liquid accelerator is easy to laminate is relieved, the stability of the accelerator is improved, the strength of sprayed mortar is improved, and the rebound rate is reduced.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a method for preparing alkali-free liquid accelerator by using suspension.
Background
The accelerator is an essential additive component in sprayed concrete, and has the main effects of accelerating the setting time of the concrete, reducing rebound, improving early strength and meeting different engineering requirements. And along with the development of industry and the requirement of each corresponding standard on alkali-free accelerator, the alkali-free accelerator becomes the main stream. The alkali-free accelerator can reduce the alkali content, correspondingly reduce the alkali aggregate reaction of concrete, and has low environmental pollution and low injury to workers.
The prior art CN102229477A discloses an alkali-free chlorine-free liquid concrete accelerator which comprises the following components in parts by weight: 34-41 parts of aluminum salt, 0-5 parts of inorganic acid, 2-10 parts of organic alcohol, 0.2-2 parts of alcohol amine, 0.2-2 parts of complexing agent and 49-59 parts of water, CN102992677A discloses an alkali-free liquid accelerator, wherein the raw materials and the preparation of the alkali-free liquid accelerator do not contain alkali, and the accelerator comprises the following components in parts by weight: 30-80% of aluminum sulfate, 1-10% of hydroxycarboxylic acid, 4-15% of organic amine, 3-10% of polyalcohol, 1-5% of inorganic acid and the balance of water, and CN109180053A discloses a low-resilience early-strength liquid alkali-free accelerator which comprises the following raw materials in percentage by mass: 60% of modified aluminum sulfate solution, 0.5% of graphene oxide, 15% of stabilizer, 15% of performance regulator, 0.5% of penetrating agent, 0.1% of pH buffer and the balance of water, wherein the alkali-free accelerator has poor long-time storage capacity, and CN104108894A discloses an alkali-free chlorine-free liquid accelerator which is prepared from the following raw materials in parts by weight: polyaluminum sulfate: 35-55%, magnesium oxide: 5-25% of citrate salt: 15-30% of polyaluminum sulfate, inorganic acid: 1-5% of stabilizer: 1-5% of defoamer: 1-5% chlorine scavenger: 1-5% of water and the balance of water, wherein the total weight is 100%. The alkali content of the invention is less than 1%, the chloride ion content is less than 1.1%, and the stability of the accelerator is improved by adopting a stabilizing method such as thickening, emulsifying and the like in the patent document CN107140867A, CN109761532A, CN110627397A, CN113121146A, CN1792959A, CN115057650A, however, the accelerator prepared by the method has little phenomena such as layering, crystallization and the like although the accelerator is stored for a long time without influencing the use, and the enhancement effect and the rebound rate of the accelerator are still to be improved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for preparing an alkali-free liquid accelerator by using a suspension, and the alkali-free liquid accelerator with good quick-setting effect, good stability and low rebound rate is prepared by adopting the steps of preparing the suspension and then mixing.
Specifically, the method for preparing the alkali-free liquid accelerator by using the suspension comprises the following steps:
1) Adding water into aluminum salt, alcohol amine, polyalcohol and surfactant, and placing the mixture into an ultrasonic oscillator for oscillation to prepare modified aluminum salt suspension;
2) Mixing the nanofiber with water, and stirring by adopting a high-speed dispersing machine to prepare a nanofiber suspension;
3) Mixing and stirring the modified aluminum salt suspension, the nanofiber suspension and water to obtain the nano-fiber composite material.
Preferably, the mass ratio of the aluminum salt, the alcohol amine, the polyalcohol, the surfactant and the water in the step 1) is 55-65:1-8:0.5-2:0.1-0.5:25-35, and the oscillation time is 1-3h.
Preferably, the mass ratio of the nanofiber to the water in the step 2) is 3-5:100, the stirring speed is 2000r/min, and the stirring time is 20-40min.
Preferably, the mass ratio of the modified aluminum salt suspension to the nanofiber suspension in the step 3) to water is 55-70:10-15:15-25, the mixing and stirring speed is 300r/min, and the mixing and stirring time is 20-40min.
Preferably, the aluminum salt is selected from one or more of aluminum sulfate, polyaluminum sulfate, aluminum hydroxide and aluminum carbonate. The alkali-free liquid accelerator mainly has quick setting effect and is aluminum salt such as aluminum sulfate, active aluminum hydroxide and the like, and the accelerator ionizes a large amount of Al 3+ 、SO 4 2- And C 3 S dissolved Ca 2+ Fast reaction to form AFt crystals due to Ca in the liquid phase 2+ Is rapidly combined to cause C 3 S is hydrated to generate C-S-H gel, the C/S is smaller, the permeability is good, and water can gradually permeate the C-S-H gel to C 3 S is internally diffused while C 3 Ca in S 2+ Can also be out-diffused into liquid phase to further prevent C 3 The occurrence of S induction period finally realizes the rapid coagulation of the slurry, and in addition, SO 4 2- Ca (OH) in cement paste 2 、Al 2 O 3 The components react rapidly to form a large amount of gypsum and AFt crystals, and the newly formed crystals cross to form a long and formed network structure, so that the slurry is quickly solidified. Therefore, the process of developing the high-efficiency liquid alkali-free accelerator is mainly the process of obtaining a stable solution with high aluminum ion content, and the aluminum salt is a preferable material.
Preferably, the alcohol amine is selected from one or more of ethanolamine, diethanolamine, triethanolamine and triisopropanolamine. Alcohol amine can form water-soluble complex with aluminum ion and iron ion in cement hydration process, and C is added in early stage of hydration 3 A and the product thereof, and the impermeable film thereof cause damageThereby accelerating C 3 A、C 4 The dissolution rate of AF and the reaction with gypsum are also accelerated, the conversion rate of ettringite is accelerated, and Ca in the liquid phase is reduced 2+ 、Al 3+ Concentration, thereby promoting C again 3 S, the hydration promotes the acceleration of cement to form early strength.
Preferably, the polyol is selected from one or more of propylene glycol, ethylene glycol and glycerol.
Preferably, the surfactant is selected from one or more of branched alkylbenzene sulfonate, alpha-olefin sulfonate and alkyl sulfonate. The aluminum salt has low solubility, alcohols can play a role in solubilization, and the surfactant and ultrasonic vibration form are added to wrap aluminum salt particles in bubbles formed by the oscillation of the surfactant, so that the aluminum salt is promoted to form nano-scale.
The invention adopts the surfactant and ultrasonic oscillation mode to disperse the aluminum salt to the nanometer level, has the dispersion-assisting effect of alcohol amine and alcohol, can reduce the agglomeration probability of the aluminum salt to a greater extent, can ensure that the suspension has higher stability and dispersion uniformity, and ensures that the prepared accelerator has longer stability period.
Preferably, the nanofiber is selected from nanoscale layered chain silicate, the diameter of the nanofiber is 20-100nm, and the length of the nanofiber is 500-1500nm.
Preferably, the nanofiber is at least one selected from nano hydrated magnesium aluminum silicate fiber and nano magnesium silicate fiber.
The research of the invention shows that the nano fiber after high-speed dispersion has higher viscosity, and the nano fiber after high-speed dispersion has effective adsorption performance due to the special needle-shaped structure, so that the nano fiber after high-speed dispersion has thixotropic property and pseudoplasticity, thereby playing a role in thickening and stabilizing, on the other hand, the nano silicate mineral can form cement hydration sites, strengthen the adhesion of cement hydration products on the nano fiber, improve the binding force of the nano fiber and cement paste, further reduce the rebound rate, and can fill gaps of cement hydration minerals after reacting with the cement hydration minerals, and improve the compactness of the hydration minerals, thereby improving the early strength of the accelerator.
The invention also relates to an alkali-free liquid accelerator, and in particular relates to the alkali-free liquid accelerator prepared by the method.
The invention adopts a suspension mode and combines the nano fibers, thereby relieving the condition that the alkali-free liquid accelerator is easy to delaminate, improving the stability, and the prepared product can be maintained for more than 9 months without any crystallization phenomenon, and the product can meet the requirements of the existing GB/T35159-2017 accelerator for shotcrete.
Detailed Description
The setting accelerator prepared in the examples and the comparative examples was used in an amount of 5% and the setting time, the mortar 1d strength and the 28d stability were tested according to the national standard GB/T35159-2017, and the mortar was subjected to a dome rebound rate test.
Example 1
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 60 parts of aluminum sulfate, 7 parts of triethanolamine, 1 part of propylene glycol and 0.2 part of sodium dodecyl benzene sulfonate into 31.8 parts of water, and placing the mixture into an ultrasonic oscillator to oscillate for 2 hours to prepare a modified aluminum salt suspension; 2) Mixing 4 parts of nano hydrated magnesium aluminum silicate fibers with 100 parts of water, and stirring for 30min at 2000r/min by adopting a high-speed dispersing machine to prepare a nano fiber suspension; 3) Mixing 60 parts of modified aluminum salt suspension, 15 parts of nanofiber suspension and 25 parts of water at 300r/min for 30min, and stirring to obtain the nano-fiber.
Through detection, the initial setting time of the paste is 3:40, the final setting time is 6:30, the 1d compressive strength is 12MPa, the 28d stability is 0mL, and the vault rebound rate is 6.2%.
Example 2
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 55 parts of polyaluminum sulfate, 7 parts of diethanolamine, 0.5 part of glycerol and 0.2 part of sodium dodecyl sulfate into 37.3 parts of water, and placing the mixture in an ultrasonic oscillator to oscillate for 2 hours to prepare a modified aluminum salt suspension; 2) Mixing 5 parts of nano magnesium silicate fiber with 100 parts of water, and stirring for 30min at 2000r/min by adopting a high-speed dispersing machine to prepare nano fiber suspension; 3) Mixing 65 parts of modified aluminum salt suspension, 10 parts of nanofiber suspension and 25 parts of water at 300r/min for 30min, and stirring to obtain the nano-fiber.
Through detection, the initial setting time of the paste is 3:05, the final setting time is 5:00, the 1d compressive strength is 14MPa, the 28d stability is 0mL, and the vault rebound rate is 5.8%.
Comparative example 1
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 55 parts of polyaluminum sulfate, 7 parts of diethanolamine, 0.5 part of glycerol and 0.2 part of sodium dodecyl sulfate into 37.3 parts of water, and placing the mixture in an ultrasonic oscillator to oscillate for 2 hours to prepare a modified aluminum salt suspension; 2) Mixing 65 parts of modified aluminum salt suspension, 10 parts of nano magnesium silicate fiber and 25 parts of water at 300r/min for 30min, and stirring to obtain the nano magnesium silicate fiber.
Through detection, the initial setting time of the paste is 4:15, the final setting time is 7:00, the 1d compressive strength is 10MPa, the 28d stability is 15mL, and the vault rebound rate is 9.6%.
Comparative example 2
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 55 parts of polyaluminum sulfate, 7 parts of diethanolamine, 0.5 part of glycerol and 0.2 part of sodium dodecyl sulfate into 37.3 parts of water, and placing the mixture in a stirrer to stir for 2 hours to prepare a first solution; 2) Placing 5 parts of nano magnesium silicate fiber and 100 parts of water in a stirrer to stir for 30min to prepare a second solution; 3) Mixing 65 parts of the first solution, 10 parts of the second solution and 25 parts of water at 300r/min for 30min, and stirring to obtain the final product.
Through detection, the initial setting time of the paste is 4:50, the final setting time is 6:55, the 1d compressive strength is 11MPa, the 28d stability is 30mL, and the vault rebound rate is 11.2%.
Comparative example 3
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 55 parts of polyaluminum sulfate, 7 parts of diethanolamine, 0.5 part of glycerol and 0.2 part of sodium dodecyl sulfate into 37.3 parts of water, and placing the mixture in a stirrer to stir for 2 hours to prepare a first solution; 2) Placing 5 parts of sepiolite powder serving as a suspension stabilizer and 100 parts of water into a stirrer to stir for 30min, and preparing a second solution; 3) Mixing the first solution 65 parts, the second solution 10 parts and water 25 parts at 3000r/min for 30min, and stirring.
Through detection, the initial setting time of the paste is 3:40, the final setting time is 6:35, the 1d compressive strength is 12MPa, the 28d stability is 10mL, and the vault rebound rate is 8.5%.
Comparative example 4
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 55 parts of polyaluminum sulfate, 7 parts of diethanolamine, 0.5 part of glycerol and 0.2 part of sodium dodecyl sulfate into 37.3 parts of water, and placing the mixture in a stirrer for stirring for 2 hours to prepare concentrated mother liquor; 2) And (3) diluting and mixing 75 parts of concentrated mother solution and 25 parts of water at 300r/min for 30min, and stirring to obtain the water-soluble polymer.
Through detection, the initial setting time of the clear slurry is 5:10, the final setting time is 6:40, the 1d compressive strength is 9.5MPa, the 28d stability is 45mL, and the vault rebound rate is 11.7%.
Comparative example 5
The preparation method of the alkali-free liquid accelerator comprises the following steps: 1) Adding 55 parts of polyaluminum sulfate, 7 parts of diethanolamine, 0.5 part of glycerol and 0.2 part of sodium dodecyl sulfate into 37.3 parts of water, and placing the mixture into an ultrasonic oscillator to oscillate for 2 hours to prepare concentrated mother liquor; 2) And (3) diluting and mixing 75 parts of concentrated mother solution and 25 parts of water at 300r/min for 30min, and stirring to obtain the water-soluble polymer.
Through detection, the initial setting time of the clear slurry is 5:25, the final setting time is 6:50, the 1d compressive strength is 8.8MPa, the 28d stability is 35mL, and the vault rebound rate is 10.3%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limited thereto; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for preparing alkali-free liquid accelerator by using suspension, which is characterized by comprising the following steps:
1) Adding water into aluminum salt, alcohol amine, polyalcohol and surfactant, and placing the mixture into an ultrasonic oscillator for oscillation to prepare modified aluminum salt suspension;
2) Mixing the nanofiber with water, and stirring by adopting a high-speed dispersing machine to prepare a nanofiber suspension; the nanofiber is selected from nanoscale layered chain silicate, the diameter of the nanofiber is 20-100nm, and the length of the nanofiber is 500-1500nm;
3) Mixing and stirring the modified aluminum salt suspension, the nanofiber suspension and water to obtain the modified aluminum salt;
step 1), the mass ratio of aluminum salt, alcohol amine, polyalcohol, surfactant and water is 55-65:1-8:0.5-2:0.1-0.5:25-35, and the oscillation time is 1-3h;
step 2), the mass ratio of the nanofiber to the water is 3-5:100, the stirring speed is 2000r/min, and the stirring time is 20-40min;
step 3), mixing and stirring the modified aluminum salt suspension, the nanofiber suspension and water in a mass ratio of 55-70:10-15:15-25 at a speed of 300r/min for 20-40min.
2. The method for preparing an alkali-free liquid accelerator by using a suspension according to claim 1, wherein the aluminum salt is one or more selected from aluminum sulfate, polyaluminum sulfate and aluminum carbonate.
3. The method for preparing alkali-free liquid accelerator by using the suspension according to claim 1, wherein the alcohol amine is one or more selected from ethanolamine, diethanolamine, triethanolamine and triisopropanolamine, and the polyhydric alcohol is one or more selected from propylene glycol, ethylene glycol and glycerol.
4. The method for preparing an alkali-free liquid accelerator using a suspension according to claim 1, wherein the surfactant is one or more selected from branched alkylbenzene sulfonate, α -olefin sulfonate, and alkyl sulfonate.
5. The method for preparing an alkali-free liquid accelerator using a suspension according to claim 4, wherein the nanofiber is at least one selected from the group consisting of nano-hydrated magnesium aluminum silicate fiber and nano-magnesium silicate fiber.
6. An alkali-free liquid accelerator, characterized in that it is prepared by the method according to any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494070.8A CN115819006B (en) | 2022-11-25 | 2022-11-25 | Method for preparing alkali-free liquid accelerator by using suspension |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014152056A (en) * | 2013-02-06 | 2014-08-25 | Denki Kagaku Kogyo Kk | Liquid quick-setting agent, quick-settable cement concrete, and spray construction method using the same |
| CN110510906A (en) * | 2019-09-30 | 2019-11-29 | 山东中岩建材科技有限公司 | A kind of alkali-free liquid accelerator and preparation method thereof |
| CN112794674A (en) * | 2019-11-14 | 2021-05-14 | 江苏博思通新材料有限公司 | Low-resilience alkali-free liquid accelerator for concrete and preparation method thereof |
| CN113548831A (en) * | 2021-08-25 | 2021-10-26 | 四川省晋川建材有限公司 | Alkali-free liquid accelerator and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014152056A (en) * | 2013-02-06 | 2014-08-25 | Denki Kagaku Kogyo Kk | Liquid quick-setting agent, quick-settable cement concrete, and spray construction method using the same |
| CN110510906A (en) * | 2019-09-30 | 2019-11-29 | 山东中岩建材科技有限公司 | A kind of alkali-free liquid accelerator and preparation method thereof |
| CN112794674A (en) * | 2019-11-14 | 2021-05-14 | 江苏博思通新材料有限公司 | Low-resilience alkali-free liquid accelerator for concrete and preparation method thereof |
| CN113548831A (en) * | 2021-08-25 | 2021-10-26 | 四川省晋川建材有限公司 | Alkali-free liquid accelerator and preparation method thereof |
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