CN117658519A - Waterproof powder accelerator and preparation method thereof - Google Patents
Waterproof powder accelerator and preparation method thereof Download PDFInfo
- Publication number
- CN117658519A CN117658519A CN202410130511.9A CN202410130511A CN117658519A CN 117658519 A CN117658519 A CN 117658519A CN 202410130511 A CN202410130511 A CN 202410130511A CN 117658519 A CN117658519 A CN 117658519A
- Authority
- CN
- China
- Prior art keywords
- water
- stirring
- accelerator
- hydroxyethyl cellulose
- waterproof
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000843 powder Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000011378 shotcrete Substances 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000002904 solvent Substances 0.000 claims abstract description 14
- 239000003381 stabilizer Substances 0.000 claims abstract description 14
- 239000000701 coagulant Substances 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 8
- 238000004078 waterproofing Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims description 59
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 45
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 45
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 45
- 235000021355 Stearic acid Nutrition 0.000 claims description 34
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical group CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 34
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 34
- 239000008117 stearic acid Substances 0.000 claims description 34
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims description 17
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 13
- 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 11
- 239000005871 repellent Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000004113 Sepiolite Substances 0.000 claims description 7
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 7
- 235000019355 sepiolite Nutrition 0.000 claims description 7
- 229910052624 sepiolite Inorganic materials 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000012798 spherical particle Substances 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical group OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 5
- CRVGTESFCCXCTH-UHFFFAOYSA-N methyl diethanolamine Chemical compound OCCN(C)CCO CRVGTESFCCXCTH-UHFFFAOYSA-N 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 18
- 239000004567 concrete Substances 0.000 abstract description 13
- 238000004090 dissolution Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 7
- 238000001556 precipitation Methods 0.000 abstract description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 abstract description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract description 2
- 239000000460 chlorine Substances 0.000 abstract description 2
- 229910052801 chlorine Inorganic materials 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 230000032798 delamination Effects 0.000 abstract description 2
- 229910052731 fluorine Inorganic materials 0.000 abstract description 2
- 239000011737 fluorine Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 238000002156 mixing Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000002940 repellent Effects 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Sealing Material Composition (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a waterproof powder accelerator and a preparation method thereof, belonging to the technical field of concrete. The composition comprises the following components: 55-65% of coagulant, 0.5-1.0% of stabilizer, 5-8% of solubilizer, 0.5-1.0% of waterproofing agent and the balance of water. The waterproof powder accelerator prepared by the invention has the advantages of no fluorine, no alkali and no chlorine, small particle size, uniform shape, extremely high dissolution speed, more outstanding construction performance when being used for sprayed concrete compared with like products, and flexible and convenient liquid form use, can be prepared on site, and can effectively avoid the problems of delamination and precipitation of the liquid accelerator caused by overlong storage time, easy crystallization in low-temperature environment and the like.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a waterproof powder accelerator and a preparation method thereof.
Background
The sprayed concrete technology is common in various construction projects, and has the characteristics of wide application range, simple process, high construction speed, high efficiency and the like. The accelerator is an additive which can quickly coagulate and harden concrete, and ensure that the concrete reaches enough strength in a short time, thereby ensuring special construction requirements, has been widely applied to projects such as tunnel, mining, slope protection, building structure reinforcement, crack resistance, seepage prevention, plugging and emergency rescue, and is one of the indispensable additives for sprayed concrete.
In the current market, mainly alkali-free liquid accelerator is adopted, and along with popularization of application range, the problems of the alkali-free liquid accelerator in the application process are more remarkable, such as poor stability and easy layering and precipitation; the cement has poor adaptability, and can not be adjusted in time when being used on site; high packaging and transportation costs, excessive remote supply of material flow costs, etc. The powder accelerator can effectively solve the problems, can be directly used for shotcrete construction in a powder form, can be transported to a construction site to be dissolved in water and used in a liquid form, can be prepared on site according to the characteristics of site materials, and has adjustable performance.
The construction of the sprayed concrete is mainly applied to dry stratum, and in recent years, along with the dynamic work of the Sichuan-Tibetan railway project, more and more tunnels with water seepage and even stranding water flow are formed, under the condition, the construction is carried out, the setting time of the sprayed concrete is obviously prolonged, even the sprayed concrete is not set for a long time, and the rebound rate is greatly increased. The impermeability and waterproofing of shotcrete have become an urgent issue to be addressed. At present, the following measures are mainly adopted for improvement: 1. when the water-flooding section is excavated, grouting is adopted to block water, but the cost of the method is often higher; 2. according to the water inflow amount, a water diversion pipe is arranged at the concentrated water flow position to guide the concentrated water flow to the outside of the sprayed concrete, but the method needs a plurality of procedures such as reaming, pipe burying, root fixing and the like, and is complex, so that the construction progress is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a waterproof powder accelerator and a preparation method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the waterproof powder accelerator comprises the following components in percentage by mass: 55-65% of coagulant, 0.5-1.0% of stabilizer, 5-8% of solubilizer, 0.5-1.0% of waterproofing agent and the balance of water; the waterproof agent is stearic acid modified hydroxyethyl cellulose.
Further, the accelerator consists of aluminum sulfate, sodium metasilicate pentahydrate and aluminum dihydrogen phosphate, wherein the total amount of the sodium metasilicate pentahydrate and the aluminum dihydrogen phosphate accounts for 8-12% of the total mass of the accelerator; the mass ratio of the sodium metasilicate pentahydrate to the aluminum dihydrogen phosphate is 1:1-1:3.
Further, the stabilizer is one or two of pseudo-boehmite and sepiolite.
Further, the solubilizer is diethanolamine, triethanolamine or N-methyldiethanolamine.
Further, the mass ratio of the hydroxyethyl cellulose to the stearic acid is (6-11) to 1.
Further, the preparation method of the stearic acid modified hydroxyethyl cellulose comprises the following steps:
(1) Adding hydroxyethyl cellulose into absolute ethyl alcohol under the stirring state of 600rpm, adopting sodium hydroxide to adjust the pH value to 7-8, and heating and stirring for 30min at 80 ℃ to obtain hydroxyethyl cellulose dispersion; the mass ratio of the hydroxyethyl cellulose to the absolute ethyl alcohol is 10-12:25;
(2) Adding stearic acid into absolute ethyl alcohol under the stirring state of rotating speed 300rpm, heating and stirring for 20min at 80 ℃, wherein the mass ratio of the stearic acid to the absolute ethyl alcohol is 1-2:10; adding the mixture into the hydroxyethyl cellulose dispersion liquid after complete dissolution, stirring for 3 hours, centrifuging to obtain a precipitate, drying at 110 ℃ and grinding to obtain stearic acid modified hydroxyethyl cellulose.
The invention also provides a preparation method of the waterproof powder accelerator, which comprises the following steps:
adding a stabilizer into water under the stirring state of 400rpm, heating and stirring for 60min at 50 ℃, then adding a coagulant into the system, stirring for 60min until the coagulant is completely dissolved, then adding a solubilizer into the system, stirring for 30min, finally adding a waterproofing agent, and stirring for 30min to obtain a waterproof liquid accelerator;
the waterproof liquid accelerator is centrifugally spray-dried at 230 ℃ to prepare spherical particles with the particle size of 20-40 mu m, and the waterproof powder accelerator is obtained. The invention also provides application of the waterproof powder accelerator in preparation of sprayed concrete. Further, the mixing amount of the waterproof powder accelerator in sprayed concrete is 8% of the mass of cement.
Compared with the prior art, the invention has the following advantages and technical effects:
(1) The hydroxyethyl cellulose molecular structure of the waterproof powder accelerator prepared by the invention contains a large number of hydroxyl groups and methyl groups, and the functional groups can adsorb moisture and have certain waterproof performance. The stearic acid modified hydroxyethyl cellulose has a three-dimensional network structure and is continuously distributed on the surface and the inner pores of the concrete, the stearic acid can react with calcium hydroxide generated by hydration of cement to generate insoluble calcium stearate, and a continuous hydrophobic film can be generated along the surface and the pores of the concrete, so that the sealing performance and the waterproof performance of the concrete can be improved. The sodium metasilicate pentahydrate can also react with water and calcium hydroxide in cement to generate calcium silicate hydrate and substances for blocking pores of concrete, and can synergistically improve the waterproof performance.
(2) The waterproof powder accelerator prepared by the invention has the advantages of no fluorine, no alkali and no chlorine, small particle size, uniform shape, extremely high dissolution speed, more outstanding construction performance when being used for sprayed concrete compared with like products, and flexible and convenient liquid form use, can be prepared on site, and can effectively avoid the problems of delamination and precipitation of the liquid accelerator caused by overlong storage time, easy crystallization in low-temperature environment and the like.
(3) Compared with liquid accelerator, the waterproof powder accelerator prepared by the invention can greatly save the packaging and transportation cost and has wider radiation range for products.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The invention provides a waterproof powder accelerator and a preparation method thereof. The waterproof powder accelerator consists of coagulant, stabilizer, solubilizer and waterproof composition. The accelerator can be directly used for shotcrete construction in powder form, or can be transported to a construction site to be dissolved in water and used in liquid form. The waterproof powder accelerator can effectively reduce rebound, and is particularly suitable for construction in a water seepage environment.
The invention provides a waterproof powder accelerator, which comprises the following components in percentage by mass: 55-65% of coagulant, 0.5-1.0% of stabilizer, 5-8% of solubilizer, 0.5-1.0% of waterproofing agent and the balance of water.
In some preferred embodiments of the invention, the accelerator is composed of aluminum sulfate, sodium metasilicate pentahydrate, and aluminum dihydrogen phosphate, wherein the total amount of sodium metasilicate pentahydrate and aluminum dihydrogen phosphate is 8-12% of the total mass of the accelerator; the mass ratio of the sodium metasilicate pentahydrate to the aluminum dihydrogen phosphate is 1:1-3.
In some preferred embodiments of the invention, the stabilizer is one or both of pseudo-boehmite and sepiolite.
In some preferred embodiments of the invention, the solubilizing agent is diethanolamine, triethanolamine or N-methyldiethanolamine.
In some preferred embodiments of the invention, the water repellent is stearic acid modified hydroxyethylcellulose. The preparation method of the stearic acid modified hydroxyethyl cellulose comprises the following steps:
(1) Adding 10-12 parts of hydroxyethyl cellulose into 25 parts of absolute ethyl alcohol under stirring (rotating speed of 600 rpm), adding sodium hydroxide to adjust the pH to 7-8, heating to 80 ℃ and continuously stirring for 30min to prepare hydroxyethyl cellulose dispersion liquid, and keeping the temperature for later use;
(2) Adding 1-2 parts of stearic acid into 10 parts of absolute ethyl alcohol under stirring (rotating speed of 300 rpm), heating to 80 ℃ and stirring for 20min until the stearic acid is completely dissolved, then adding the hydroxyethyl cellulose dispersion prepared in the step (1) into the mixture, stirring for 3h, adding the mixture into the hydroxyethyl cellulose dispersion after the stearic acid is completely dissolved, and stirring for 3h;
(3) Centrifuging the solution to remove clear liquid, and drying and grinding residues at 110 ℃ to obtain stearic acid modified hydroxyethyl cellulose.
The invention also provides a preparation method of the waterproof powder accelerator, which comprises the following steps:
slowly adding the stabilizer into a container filled with a certain amount of water under the condition of rapid stirring (rotating speed of 400 rpm), heating to 50 ℃, stirring for 60min, mixing uniformly, sequentially adding aluminum sulfate, sodium metasilicate pentahydrate and aluminum dihydrogen phosphate, stirring for 60min, adding the solubilizer after complete dissolution, continuing stirring for 30min, and adding the waterproofing agent and stirring for 30min to obtain the waterproof liquid accelerator. And then the liquid accelerator is subjected to centrifugal spray drying at 230 ℃ to prepare spherical particles with the particle size of 20-40 mu m which are uniformly distributed, namely the waterproof powder alkali-free accelerator. The invention also provides application of the waterproof powder accelerator in preparation of sprayed concrete. The mixing amount of the waterproof powder accelerator in concrete is 8% of the mass of cement.
The "parts" in the present invention are all parts by mass unless otherwise specified.
The raw materials used in the following examples of the present invention are all commercially available.
The following examples serve as further illustrations of the technical solutions of the invention.
Example 1
The waterproof powder accelerator comprises the following components in percentage by mass: 55% of a setting accelerator (consisting of 50.6% of aluminum sulfate, 1.1% of sodium metasilicate pentahydrate and 3.3% of aluminum dihydrogen phosphate), 1.0% of a stabilizer (pseudo-boehmite), 5% of a solubilizer (triethanolamine), 0.7% of a water-repellent agent (stearic acid modified hydroxyethylcellulose) and 38.3% of water.
Preparation of stearic acid modified hydroxyethyl cellulose:
(1) Adding 10 parts of hydroxyethyl cellulose into 25 parts of absolute ethyl alcohol under the stirring state of 600rpm, adjusting the pH to 7 by adopting sodium hydroxide, and heating and stirring for 30min at 80 ℃ to obtain hydroxyethyl cellulose dispersion;
(2) Adding 1.3 parts of stearic acid into 10 parts of absolute ethyl alcohol under the stirring state of rotating speed 300rpm, heating and stirring for 20min at 80 ℃, adding into the hydroxyethyl cellulose dispersion liquid after complete dissolution, and stirring for 3h;
(3) Centrifuging the solution to remove clear liquid, and drying and grinding residues at 110 ℃ to obtain stearic acid modified hydroxyethyl cellulose.
Preparation of waterproof powder accelerator:
adding 1.0% pseudo-boehmite into a container filled with 38.3% water under the stirring state of 400rpm, heating and stirring for 60min at 50 ℃, sequentially adding 50.6% aluminum sulfate, 2.2% sodium metasilicate pentahydrate and 2.2% aluminum dihydrogen phosphate into a system after uniformly mixing, stirring for 60min to completely dissolve, then adding 5% triethanolamine into the system, stirring for 30min, finally adding 0.7% stearic acid modified hydroxyethyl cellulose, and stirring for 30min to obtain the waterproof liquid accelerator;
the waterproof liquid accelerator is centrifugally spray-dried at 230 ℃ to prepare spherical particles with the particle size of 20-40 mu m which are uniformly distributed, and the waterproof powder accelerator is obtained.
Example 2
The waterproof powder accelerator comprises the following components in percentage by mass: 60% of a setting accelerator (consisting of 54% of aluminum sulfate, 2% of sodium metasilicate pentahydrate and 4% of aluminum dihydrogen phosphate), 0.7% of a stabilizer (sepiolite), 8% of a solubilizer (diethanolamine), 1% of a water-repellent agent (stearic acid-modified hydroxyethylcellulose) and 30.3% of water.
Preparation of stearic acid modified hydroxyethyl cellulose:
(1) Adding 12 parts of hydroxyethyl cellulose into 25 parts of absolute ethyl alcohol under the stirring state of 600rpm, adjusting the pH to 7.5 by adopting sodium hydroxide, and heating and stirring for 30min at 80 ℃ to obtain hydroxyethyl cellulose dispersion;
(2) Adding 2 parts of stearic acid into 10 parts of absolute ethyl alcohol under the stirring state of rotating speed 300rpm, heating and stirring for 20min at 80 ℃, adding the mixture into the hydroxyethyl cellulose dispersion liquid after complete dissolution, and stirring for 3h;
(3) Centrifuging the solution to remove clear liquid, and drying and grinding residues at 110 ℃ to obtain stearic acid modified hydroxyethyl cellulose.
Preparation of waterproof powder accelerator:
slowly adding 0.7% sepiolite into a container filled with 30.3% water at a rotation speed of 400rpm, heating and stirring at 50 ℃ for 60min, sequentially adding 54% aluminum sulfate, 3% sodium metasilicate pentahydrate and 3% aluminum dihydrogen phosphate into a system after uniformly mixing, stirring for 60min until the aluminum sulfate, the 3% sodium metasilicate pentahydrate and the 3% aluminum dihydrogen phosphate are completely dissolved, then adding 8% diethanolamine into the system, stirring for 30min, finally adding 1% stearic acid modified hydroxyethyl cellulose, and stirring for 30min to obtain the waterproof liquid accelerator;
the waterproof liquid accelerator is centrifugally spray-dried at 230 ℃ to prepare spherical particles with the particle size of 20-40 mu m which are uniformly distributed, and the waterproof powder accelerator is obtained.
Example 3
The waterproof powder accelerator comprises the following components in percentage by mass: 65% of a coagulant (consisting of 57.2% aluminum sulfate, 3.9% sodium metasilicate pentahydrate and 3.9% aluminum dihydrogen phosphate), 1% of a stabilizer (0.5% sepiolite and 0.5% pseudo-boehmite), 6.5% of a solubilizer (N-methyldiethanolamine), 0.5% of a waterproofing agent (stearic acid modified hydroxyethylcellulose) and 27% of water.
Preparation of stearic acid modified hydroxyethyl cellulose:
(1) Adding 11 parts of hydroxyethyl cellulose into 25 parts of absolute ethyl alcohol under the stirring state of 600rpm, adjusting the pH to 8 by adopting sodium hydroxide, and heating and stirring for 30min at 80 ℃ to obtain hydroxyethyl cellulose dispersion;
(2) Adding 1 part of stearic acid into 10 parts of absolute ethyl alcohol under the stirring state of rotating speed 300rpm, heating and stirring for 20min at 80 ℃, adding into the hydroxyethyl cellulose dispersion liquid after complete dissolution, and stirring for 3h;
(3) Centrifuging the solution to remove clear liquid, and drying and grinding residues at 110 ℃ to obtain stearic acid modified hydroxyethyl cellulose.
Preparation of waterproof powder accelerator:
slowly adding 0.5% pseudo-boehmite and 0.5% sepiolite into a container filled with 27% water under the stirring state of 400rpm, heating and stirring at 50 ℃ for 60min, sequentially adding 57.2% aluminum sulfate, 3.9% sodium metasilicate pentahydrate and 3.9% aluminum dihydrogen phosphate into the system after uniform mixing, stirring for 60min to completely dissolve, then adding 6.5% N-methyldiethanolamine into the system, stirring for 30min, finally adding 0.5% stearic acid modified hydroxyethyl cellulose, and stirring for 30min to obtain the waterproof liquid accelerator;
the waterproof liquid accelerator is centrifugally spray-dried at 230 ℃ to prepare spherical particles with the particle size of 20-40 mu m which are uniformly distributed, and the waterproof powder accelerator is obtained.
Comparative example 1
The difference from example 3 is that the water repellent is not added, the same mass is replaced by the coagulant, and the other components and the amounts are unchanged.
Comparative example 2
The same procedure as in example 3 was repeated except that the water repellent was replaced with a commercially available concrete water-impermeable water repellent of the type HUG-13 (Hubei Yu Qing Wei industry Water-repellent technology development Co., ltd.).
Control group
Accelerating agent in the prior art (HQ 300 type powder accelerating agent, inc. of New material of Yunnan Kawate)
Performance testing
The water-proof powder accelerator prepared in examples 1-3, the accelerator prepared in comparative examples 1-5 and the control group were respectively formulated into liquid accelerators (powder to water mass ratio 1:1) of the same concentration, the mixing amount in the concrete was 8%, and the setting time, 6h, 1d compressive strength and impermeability (maximum water seepage pressure was 1.0MPa test, test block height was 150 mm) were tested according to Q/CR807-2020 "liquid alkali-free accelerator for tunnel shotcrete" and GB/T50082-2009 "test method Standard for ordinary concrete long term Performance and durability". In addition, rebound rate comparison tests are carried out on the scale section with large water seepage amount through construction, and the construction of sprayed concrete is matched with the construction of the sprayed concrete, as shown in table 1. The test results are shown in Table 2.
Table 1 spray concrete construction mix ratio for Sichuan-Tibetan railway
Table 2 comparative test of Water-proof powder accelerator Performance
As can be seen from Table 2, the waterproof powder accelerator prepared by the invention meets the standard requirements of national iron group Q/CR807-2020 alkali-free liquid accelerator for tunnel shotcrete, has higher compressive strength, the 6h strength can reach more than 1.5MPa, and the 1d strength is more than 15 MPa. The impervious grade of the sprayed concrete is far above P10, and compared with the construction in which no waterproof component accelerator is added, the impervious grade of the sprayed concrete is greatly improved, and the rebound of the sprayed concrete in the water seepage environment is obviously reduced.
The foregoing is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. The waterproof powder accelerator is characterized by comprising the following components in percentage by mass: 55-65% of coagulant, 0.5-1.0% of stabilizer, 5-8% of solubilizer, 0.5-1.0% of waterproofing agent and the balance of water; the waterproof agent is stearic acid modified hydroxyethyl cellulose.
2. The water-proof powder accelerator according to claim 1, wherein the accelerator consists of aluminum sulfate, sodium metasilicate pentahydrate and aluminum dihydrogen phosphate, wherein the total amount of sodium metasilicate pentahydrate and aluminum dihydrogen phosphate is 8-12% of the total mass of the accelerator; the mass ratio of the sodium metasilicate pentahydrate to the aluminum dihydrogen phosphate is 1:1-3.
3. The water-resistant powder accelerator according to claim 1, wherein the stabilizer is one or both of pseudo-boehmite and sepiolite.
4. The water-resistant powder accelerator according to claim 1, wherein the solubilizing agent is diethanolamine, triethanolamine or N-methyldiethanolamine.
5. The water-resistant powder accelerator according to claim 1, wherein the preparation method of the stearic acid modified hydroxyethyl cellulose comprises the following steps:
adding hydroxyethyl cellulose into absolute ethyl alcohol under a stirring state, adjusting the pH value to 7-8, heating and stirring to obtain hydroxyethyl cellulose dispersion liquid;
adding stearic acid into absolute ethyl alcohol under the stirring state, heating until the stearic acid is dissolved, then adding the absolute ethyl alcohol into the hydroxyethyl cellulose dispersion liquid, continuously stirring, centrifuging to obtain a precipitate, and drying to obtain the stearic acid modified hydroxyethyl cellulose.
6. The water-repellent powder accelerator according to claim 1, wherein the mass ratio of the hydroxyethyl cellulose to the stearic acid is (6-11) to 1.
7. A method of preparing a water-repellent powder accelerator according to any one of claims 1 to 6, comprising the steps of:
adding a stabilizer into water under stirring, heating and stirring, adding a coagulant into the system, stirring until the coagulant is dissolved, adding a solubilizer into the system, continuously stirring, finally adding a waterproof agent, and stirring to obtain the waterproof liquid accelerator;
the waterproof liquid accelerator is centrifugally spray-dried at 230 ℃ to prepare spherical particles with the particle size of 20-40 mu m, and the waterproof powder accelerator is obtained.
8. Use of a water-repellent powder accelerator according to any one of claims 1 to 6 for the preparation of shotcrete.
9. The use according to claim 8, wherein the water-repellent powder accelerator is incorporated in the sprayed concrete in an amount of 8% by mass of cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410130511.9A CN117658519B (en) | 2024-01-31 | 2024-01-31 | Waterproof powder accelerator and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410130511.9A CN117658519B (en) | 2024-01-31 | 2024-01-31 | Waterproof powder accelerator and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117658519A true CN117658519A (en) | 2024-03-08 |
| CN117658519B CN117658519B (en) | 2024-04-09 |
Family
ID=90079240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410130511.9A Active CN117658519B (en) | 2024-01-31 | 2024-01-31 | Waterproof powder accelerator and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117658519B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107686271A (en) * | 2016-08-06 | 2018-02-13 | 沈阳创达技术交易市场有限公司 | It is a kind of to stretch the concrete accelerator for drawing adhesion strength high |
| CN110240435A (en) * | 2019-06-19 | 2019-09-17 | 科之杰新材料集团有限公司 | A kind of waterproof stable type alkali-free liquid accelerator and preparation method thereof |
| CN110395939A (en) * | 2019-06-19 | 2019-11-01 | 科之杰新材料集团有限公司 | A kind of enhancement type waterproof alkali-free liquid accelerator and preparation method thereof |
| CN112608065A (en) * | 2019-12-13 | 2021-04-06 | 科之杰新材料集团(贵州)有限公司 | Liquid alkali-free accelerator for sprayed concrete and preparation method thereof |
| CN113135689A (en) * | 2021-05-29 | 2021-07-20 | 石家庄市长安育才建材有限公司 | Elasticity-reducing low-sulfur alkali-free liquid accelerator and preparation method thereof |
| CN115784664A (en) * | 2023-01-17 | 2023-03-14 | 石家庄市长安育才建材有限公司 | Anti-seepage type accelerator and preparation method thereof |
| CN116874223A (en) * | 2023-08-01 | 2023-10-13 | 石家庄市长安育才建材有限公司 | Powdery alkali-free accelerator and preparation method thereof |
-
2024
- 2024-01-31 CN CN202410130511.9A patent/CN117658519B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107686271A (en) * | 2016-08-06 | 2018-02-13 | 沈阳创达技术交易市场有限公司 | It is a kind of to stretch the concrete accelerator for drawing adhesion strength high |
| CN110240435A (en) * | 2019-06-19 | 2019-09-17 | 科之杰新材料集团有限公司 | A kind of waterproof stable type alkali-free liquid accelerator and preparation method thereof |
| CN110395939A (en) * | 2019-06-19 | 2019-11-01 | 科之杰新材料集团有限公司 | A kind of enhancement type waterproof alkali-free liquid accelerator and preparation method thereof |
| CN112608065A (en) * | 2019-12-13 | 2021-04-06 | 科之杰新材料集团(贵州)有限公司 | Liquid alkali-free accelerator for sprayed concrete and preparation method thereof |
| CN113135689A (en) * | 2021-05-29 | 2021-07-20 | 石家庄市长安育才建材有限公司 | Elasticity-reducing low-sulfur alkali-free liquid accelerator and preparation method thereof |
| CN115784664A (en) * | 2023-01-17 | 2023-03-14 | 石家庄市长安育才建材有限公司 | Anti-seepage type accelerator and preparation method thereof |
| CN116874223A (en) * | 2023-08-01 | 2023-10-13 | 石家庄市长安育才建材有限公司 | Powdery alkali-free accelerator and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117658519B (en) | 2024-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103449787A (en) | Underwater non-dispersible mortar and preparation method thereof | |
| CN109160792A (en) | A kind of cement base fast waterproof plugging material and its preparation | |
| CN104177554B (en) | Environment-friendly acrylate grouting material as well as preparation method and application thereof | |
| CN112047708B (en) | Sprayed concrete and construction method thereof | |
| CN108483981A (en) | A kind of mortar reinforcing agent and preparation method thereof | |
| CN103601453B (en) | Multifunctional concentrated material used for preparing kitchen and bath cement-based waterproof material | |
| CN109180079B (en) | Preparation method and application method of waterproof glutinous rice mortar | |
| CN100355853C (en) | Water-proofing material for stopping leak | |
| CN105731991B (en) | A kind of modified phosphate magnesium cement and preparation method thereof | |
| CN117658519B (en) | Waterproof powder accelerator and preparation method thereof | |
| CN109796161A (en) | Resistance to jelly concrete of one kind and preparation method thereof | |
| CN112225486B (en) | Stable alkali-free liquid accelerator and preparation method and application thereof | |
| CN116375399B (en) | Dry-mixed thin-layer anti-cracking plastering mortar and preparation method thereof | |
| CN106431153A (en) | Phosphoaluminate cement-based rapid repairing material and preparation method thereof | |
| CN110183189B (en) | Shield anti-water dispersion synchronous grouting slurry with controllable initial setting time and preparation method thereof | |
| CN110283267A (en) | Impervious leakage-stopping acrylates chemical grouting liquid and preparation method thereof | |
| CN115521103A (en) | Underwater grouting plugging material and preparation method thereof | |
| CN115784664A (en) | Anti-seepage type accelerator and preparation method thereof | |
| CN113735549B (en) | Magnesium oxychloride cement-based double-liquid grouting material and preparation method thereof | |
| KR100979180B1 (en) | Composition of rapid setting micro cement | |
| CN108285286A (en) | A kind of preparation method of polycarboxylate water-reducer suitable for mortar | |
| CN111620586A (en) | Early-strength fluorine-containing alkali-free super coagulant and preparation method thereof | |
| CN112194430B (en) | Slurry for grouting of vegetation ecological sensitive area shallow-buried underground excavated large-section tunnel and application | |
| CN109879628A (en) | A kind of water-resistant type building mortar plasticizer and preparation method thereof | |
| CN113548832B (en) | Alkali-free liquid foam concrete conditioning and solidifying agent and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |