CN114804694A - Liquid accelerator for tunnel concrete and preparation method thereof - Google Patents
Liquid accelerator for tunnel concrete and preparation method thereof Download PDFInfo
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- CN114804694A CN114804694A CN202210498102.5A CN202210498102A CN114804694A CN 114804694 A CN114804694 A CN 114804694A CN 202210498102 A CN202210498102 A CN 202210498102A CN 114804694 A CN114804694 A CN 114804694A
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- 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
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
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- 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
Abstract
The invention discloses a liquid accelerator for tunnel concrete, which comprises aluminum sulfate, modified silicon dioxide, magnesium fluosilicate, organic carboxylic acid and an organic hydroxylamine compound. Wherein, the content of aluminum sulfate is 44-50%, the content of magnesium fluosilicate is 2-5%, calculated based on the total weight of the liquid accelerator. In addition, the invention also discloses a preparation method of the liquid accelerator. The carboxylation modified nano silicon dioxide has obvious effects on improving mechanical property and quick setting effect, and the organic alcohol amine compound has similar effects; the ethylene-vinyl acetate rubber powder only plays a significant role in improving the quick setting effect.
Description
Technical Field
The invention belongs to the technical field of building materials; relates to a concrete additive and a preparation method thereof, in particular to a liquid accelerator for sprayed concrete and a preparation method thereof, which can be widely applied to the sprayed concrete in various projects such as tunnels, mines, urban construction projects, underground culverts, water diversion tunnels and the like; more particularly, relates to a liquid accelerator for tunnel concrete and a preparation method thereof.
Background
The concrete spraying technology is a technology that a certain proportion of mixture such as cement, gravel, admixture and the like is sprayed onto a working surface through a spray pipe by means of air pressure, so that the mixture is coagulated and hardened in a short time, and then the reinforcement and reinforcement effects are achieved. The concrete spraying technology does not need to be supported by a template, has good forming conditions, fast concrete setting and hardening and fast construction progress, is widely applied to concrete spraying construction of underground projects such as tunnels, mines, urban construction projects, underground culverts, diversion tunnels and the like, has self-waterproof concrete spraying support, leakage prevention and leakage stoppage construction of structures, quick construction of ground concrete, emergency rescue of concrete and the like, and is an effective measure for engineering reinforcement. .
In the early stage, the sprayed cement mortar has a low setting speed and cannot be well bonded with the rock, so that the cement mortar is easy to collapse. The dilemma is broken through by the successful development of the accelerator. Concrete accelerators are chemical admixtures which cause rapid setting of cement or concrete and are sometimes referred to as set accelerators. It can make the cement mortar sprayed to the rock surface quickly set and hardened, thereby preventing the cement mortar from falling.
The accelerating agent is divided into aluminoxy clinker, water glass, aluminate, aluminum sulfate and aluminum hydroxide according to the main components; the accelerator is divided into an alkaline accelerator and an alkali-free accelerator according to alkali content, and the accelerator with the alkali content less than 1 percent is called the alkali-free accelerator abroad; the concrete can be divided into powder and liquid setting accelerators according to morphological division.
Concrete accelerators are typically added at the nozzle when the concrete is sprayed. Since the powdery accelerator occupies the main position, dry spraying is correspondingly adopted in concrete spraying construction. With the improvement of the requirements of underground engineering on the quality of sprayed concrete and the continuous improvement of environmental awareness, the dry spraying method cannot meet the requirements due to the fact that a large amount of dust pollution is generated during construction, and the wet spraying method is a necessary trend of the technical development of the sprayed concrete. The liquid accelerator matched with the wet spraying method also becomes the main development direction of the accelerator technology.
In the liquid accelerator, the alkaline accelerator mainly uses strong alkali sodium hydroxide, sodium metaaluminate and the like which are hydrolyzed to promote the hydration of cement, so as to excite the activity of component materials in the cement, greatly shorten the initial setting and final setting time of the cement and be beneficial to promoting the development of the early strength of the concrete. However, the high-alkali accelerating agent has great corrosive damage to construction workers, the damage is mainly caused by the corrosivity of strong alkali components in the accelerating agent on skin, and some accelerating agents contain strong acid or toxic element fluorine, which can bring potential threat to the life health of constructors; and the traditional high-alkali accelerating agent introduces a large amount of strong alkali, so that the later compressive strength of the concrete is seriously damaged due to the alkali aggregate reaction of the concrete.
Researchers are constantly trying new materials to reduce the alkali content in the accelerator, and at present, aluminum sulfate is used as one of the important research directions for the alkali-free/low-alkali accelerator instead of part or all of alkali metal salts as a provider of aluminum ions. Aluminum sulfate is an ideal raw material which can significantly accelerate cement hydration, is alkali-free per se, and has become a main accelerating component for preparing alkali-free liquid accelerators.
The aluminum sulfate series liquid accelerator has the contradiction between the mixing amount and the stability, and if the stability of the accelerator is improved, excessive aluminum sulfate cannot be dissolved in the solution, so that the reduction of the effective components inevitably increases the mixing amount of the accelerator. The accelerator mainly plays a role in accelerating the setting of Al 3+ Therefore, Al can be selected 2 O 3 Higher content of the originalMaterial, Al in polyaluminium sulfate 2 O 3 The content is more than 17%, and the raw material is preferable.
Al(OH) 3 The Al element in ionic state can obviously shorten the setting time of cement. The accelerating agents have excellent accelerating effect, when the mixing amount of the accelerating agents is 4-5%, the cement setting time can meet the standard requirement, but the early strength of cement mortar mixed with the accelerating agents is low, so that the rebound rate of sprayed concrete is high, and much dust is generated; meanwhile, the aluminum ion content is low, and the defects of instability, large doping amount and the like are obvious.
Chinese patent application publication CN109734347A discloses a nano-crystal-seed-enhanced alkali-free accelerator and a preparation method thereof, wherein the accelerator is composed of the following raw materials in parts by mass: 0-15% of lithium sulfate, 30-50% of aluminum sulfate, 5-10% of magnesium sulfate, 5-15% of modified nano-silica microspheres, 5-10% of organic alcohol amine, 3-5% of inorganic acid and the balance of water. The provided nano crystal seed enhanced alkali-free accelerator is used as a crystal nucleus in the cement hydration process by introducing the modified nano silicon dioxide microspheres with the amphiphilic characteristic, so that the hydration rate of cement in sprayed concrete is effectively improved, and the early and later strength of the sprayed concrete is obviously improved. The novel alkali-free accelerator has the outstanding characteristics of low mixing amount, good stability, high strength retention rate, friendly production environment and the like, and can effectively improve the mechanical property and durability of sprayed concrete. The final setting time of the patent application is still relatively long.
Chinese patent application publication CN110104987A discloses a high early strength alkali-free liquid accelerator, a preparation method and application thereof, wherein the accelerator is composed of the following raw materials by weight percent: 40-50% of polyaluminium sulfate, 5-10% of metakaolin, 5-15% of nano silica sol, 3-6% of alcohol amine, 1-4% of organic acid, 0.01-0.05% of thickening agent, 0.01-0.05% of dispersing agent and the balance of water. On the basis of meeting the national standard, the quick-setting admixture can also effectively improve the 1-day compressive strength of cement mortar to be more than 20MPa, and the 1-day compressive strength of partial cement mortar can even be more than 25 MPa. However, the initial setting time of the patent application is still long, and meanwhile, the compressive strength is obviously higher than that of the prior art, and the repeatability is poor.
Chinese patent application publication CN109265064A discloses a preparation method of a high-strength alkali-free and chlorine-free accelerator: the method comprises the following steps: 1) ultrasonically dispersing 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, a modified nano silicon dioxide solution initiator and water uniformly, heating to 60-80 ℃, and reacting for 5-8h to obtain a mixed solution A; 2) heating aluminum sulfate, alcohol amine, water and the mixed solution A to 60-80 ℃ to react for 1-5 h to obtain a mixed solution B; cooling to room temperature, and then dispersing at high speed for 10 minutes by using an emulsifying machine to obtain the high-strength alkali-free chlorine-free accelerator. The alkali-free and chlorine-free setting accelerator prepared by organic modification can greatly improve the 1d compressive strength of cement mortar, and can improve the comprehensive properties of the product such as stability and the like. However, the preparation method is complicated.
In the prior art, the nano-silica powder has large specific surface area and surface energy, is difficult to disperse in cement, and finally exists in the form of aggregates which are not uniformly dispersed, so that a weak area is formed in cement concrete, and the mechanical property of the cement concrete is reduced; meanwhile, the quick setting effect is not ideal.
Therefore, it is urgently required to provide a liquid accelerator for shotcrete having improved mechanical properties and accelerating effect and a method for preparing the same.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a liquid quick-setting agent for shotcrete with improved mechanical properties and quick-setting effect and a preparation method thereof.
In order to achieve the above object, in one aspect, the technical solution adopted by the present invention is as follows: a liquid accelerator for shotcrete, comprising aluminum sulfate, modified silica, magnesium silicofluoride, an organic carboxylic acid and an organic hydroxylamine compound.
Advantageously, the content of aluminium sulphate is 44-50%, based on the total weight of the liquid accelerator.
Advantageously, the magnesium fluorosilicate is present in an amount of from 2 to 5 percent, based on the total weight of the liquid accelerator.
The liquid accelerator according to the invention, wherein the modified silica is selected from carboxylated modified nano-silica.
Advantageously, the content of the modified silica is 4 to 7% based on the total weight of the liquid accelerator.
The liquid accelerator is characterized in that the carboxylated modified nano-silica is prepared by reacting nano-silica, KH-550 and succinic anhydride at the temperature of 60-100 ℃.
The liquid accelerator provided by the invention is characterized in that the average particle size of the nano silicon dioxide is 10-30nm, and the specific surface area is more than or equal to 500m 2 (ii)/g, hydrophilic type.
The liquid accelerator provided by the invention is characterized in that the weight ratio of the nano silicon dioxide, the KH-550 and the succinic anhydride is 10: (10-15): (5-6).
The liquid accelerator according to the present invention, wherein the organic carboxylic acid is selected from glycolic acid.
Advantageously, the content of organic carboxylic acid is 1-4% based on the total weight of the liquid accelerator.
The liquid accelerator according to the present invention, wherein the organic hydroxylamine compound is selected from a combination of triethanolamine and diethanol monoisopropanolamine.
Advantageously, the content of the organic hydroxylamine compound is 4 to 8% based on the total weight of the liquid accelerator.
Preferably, the organic hydroxylamine compound is selected from a mixture of triethanolamine and diethanolisopropanolamine.
Advantageously, the weight ratio of triethanolamine to diethanolisopropanolamine is 1: (0.5-1).
The liquid accelerator provided by the invention further comprises ethylene-vinyl acetate rubber powder.
Advantageously, the ethylene-vinyl acetate gel powder is present in an amount of 0.5 to 2%, based on the total weight of the liquid accelerator.
In a specific embodiment, the ethylene vinyl acetate gel powder is selected from ACCURATE ™ 5011N, available from New materials, Inc. of Shandong Landu.
The liquid accelerator comprises the following components in parts by weight:
44-50% of aluminum sulfate;
4-7% of carboxyl modified nano silicon dioxide;
2-5% of magnesium fluosilicate;
3-5% of triethanolamine;
1-3% of diethanol monoisopropanolamine;
1-4% of glycolic acid;
0.5 to 2 percent of ethylene-vinyl acetate rubber powder;
the balance of distilled water.
In another aspect, the present invention further provides a method for preparing a liquid accelerator for shotcrete according to the present invention, the method comprising:
(1) adding aluminum sulfate and magnesium fluosilicate with the formula ratio into distilled water, heating to 40-80 ℃, and dissolving by ultrasonic to obtain a solution 1;
(2) uniformly mixing the diethanol monoisopropanolamine and the glycolic acid according to the formula ratio to obtain a mixed solution; then, dropwise adding the mixed solution into the solution 1 to obtain a solution 2;
(3) adding the carboxylated modified nano silicon dioxide with the formula amount into the solution 2, and performing ultrasonic treatment to uniformly disperse the nano silicon dioxide to obtain a dispersion solution 1;
(4) adding the ethylene-vinyl acetate rubber powder with the formula ratio into the dispersion liquid, and performing ultrasonic treatment to uniformly disperse the ethylene-vinyl acetate rubber powder into the dispersion liquid to obtain a dispersion liquid 2, namely the liquid accelerator for sprayed concrete.
Compared with the prior art, the liquid accelerator for sprayed concrete provided by the invention has the advantages that the mechanical property and the accelerating effect are improved. Without wishing to be bound by any theory, the composition of the particular liquid accelerator of the invention serves the above-mentioned function.
The inventor believes that the carboxylation modified nano silicon dioxide has obvious effects on improving mechanical property and quick setting effect, and the organic alcohol amine compound has similar effects; the ethylene-vinyl acetate rubber powder only plays a significant role in improving the quick setting effect.
Detailed Description
It must be noted that, as used in this specification and the appended claims, the singular forms "a," "an," and "the" include both one and more than one (i.e., two, including two) unless the context clearly dictates otherwise.
Unless otherwise indicated, the numerical ranges in this disclosure are approximate and thus may include values outside of the stated ranges. The numerical ranges may be stated herein as from "about" one particular value, and/or to "about" another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about," it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the numerical ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
Reference in the specification and concluding claims to parts by weight of a particular element or component in a composition or article refers to the weight relationship between that element or component and any other elements or components in the composition or article, expressed as parts by weight.
In the present invention, unless specifically indicated to the contrary, or implied from the context or customary practice in the art, all solutions referred to herein are aqueous solutions; when the solute of the aqueous solution is a liquid, all fractions and percentages are by volume and the volume percentages of a component are based on the total volume of the composition or product in which it is contained; when the solute of the aqueous solution is a solid, all fractions and percentages are by weight, and the weight percentages of a component are based on the total weight of the composition or product in which the component is included.
References to "comprising," "including," "having," and similar terms in this specification are not intended to exclude the presence of any optional components, steps or procedures, whether or not any optional components, steps or procedures are specifically disclosed. In order to avoid any doubt, all methods claimed through use of the term "comprising" may include one or more additional steps, apparatus parts or components and/or materials unless stated to the contrary. In contrast, the term "consisting of … …" excludes any component, step, or procedure not specifically recited or recited. Unless otherwise specified, the term "or" refers to the listed members individually as well as in any combination.
Furthermore, the contents of any referenced patent or non-patent document in this application are incorporated by reference in their entirety, especially with respect to definitions disclosed in the art (where not inconsistent with any definitions specifically provided herein) and general knowledge.
In the present invention, parts are parts by weight unless otherwise indicated, temperatures are indicated in ° c or at ambient temperature, and pressures are at or near atmospheric. The room temperature means 20-30 ℃. There are many variations and combinations of reaction conditions (e.g., component concentrations, desired solvents, solvent mixtures, temperatures, pressures, and other reaction ranges) and conditions that can be used to optimize the purity and yield of the product obtained by the process. Only reasonable routine experimentation will be required to optimize such process conditions.
Synthesis example
8g of nano-silica (average particle diameter of 15nm, specific surface area of 600 m) 2 Hydrophilic type purchased from Nanjing Ginko nanotechnology Co., Ltd.) was added to 50mL of DMF, and subjected to ultrasonic treatment to disperse the solution uniformly, while 5mL of deionized water was added, and the ultrasonic treatment was continued for 2min to obtain a nano-silica dispersion.
Adding 10g KH-550 and 4.5g succinic anhydride into 50mL DMF, and stirring at 80 deg.C for 3 h; and dropwise adding the nano silicon dioxide dispersion liquid into the reaction system, and reacting for 8 hours under the condition of heat preservation. And centrifuging the reaction mixed solution, washing the reaction mixed solution by absolute ethyl alcohol, absolute THF (tetrahydrofuran), acetone and deionized water respectively, and drying the reaction mixed solution in vacuum to obtain a white solid product, thus obtaining the carboxylated modified nano-silica. 1100cm on FT-IR spectrum of carboxylation modified nano-silica relative to unmodified nano-silica -1 Is increased in strength and comes outNow 2930cm -1 、2850cm -1 And 1380cm -1 The surface modification was successful.
Example 1
A liquid accelerator for sprayed concrete is composed of the following components:
48 percent of aluminum sulfate;
5% of carboxyl modified nano silicon dioxide;
3% of magnesium fluosilicate;
4% of triethanolamine;
2% of diethanolisopropanolamine;
2% of glycolic acid;
1% of ethylene-vinyl acetate rubber powder (ACCURATE. RTM. 5011N, available from Shandong Landu New materials Co., Ltd.);
the balance of distilled water.
The preparation method of the liquid accelerator for sprayed concrete comprises the following steps:
(1) adding aluminum sulfate and magnesium fluosilicate with the formula ratio into distilled water, heating to 60 ℃, and dissolving by ultrasonic to obtain a solution 1.
(2) Uniformly mixing the diethanol monoisopropanolamine and the glycolic acid according to the formula ratio to obtain a mixed solution; the mixture was then added dropwise to solution 1 to give solution 2.
(3) Adding the carboxylated modified nano silicon dioxide with the formula amount into the solution 2, and performing ultrasonic treatment to uniformly disperse the nano silicon dioxide to obtain a dispersion liquid 1.
(4) Adding the ethylene-vinyl acetate rubber powder with the formula ratio into the dispersion liquid, and performing ultrasonic treatment to uniformly disperse the ethylene-vinyl acetate rubber powder into the dispersion liquid to obtain a dispersion liquid 2, namely the liquid accelerator for sprayed concrete.
Example 2
A liquid accelerator for sprayed concrete is composed of the following components:
46% of aluminum sulfate;
6% of carboxyl modified nano silicon dioxide;
4% of magnesium fluosilicate;
3.5 percent of triethanolamine;
1.5 percent of diethanol monoisopropanolamine;
3% of glycolic acid;
ethylene-vinyl acetate gel powder (ACCURATE. RTM. 5011N, available from Shandong Landu New materials Co., Ltd.) 2%;
the balance of distilled water.
The preparation method of the liquid accelerator for sprayed concrete comprises the following steps:
(1) adding aluminum sulfate and magnesium fluosilicate with the formula ratio into distilled water, heating to 60 ℃, and dissolving by ultrasonic to obtain a solution 1.
(2) Uniformly mixing the diethanol monoisopropanolamine and the glycolic acid according to the formula ratio to obtain a mixed solution; the mixture was then added dropwise to solution 1 to give solution 2.
(3) Adding the carboxylated modified nano silicon dioxide with the formula amount into the solution 2, and performing ultrasonic treatment to uniformly disperse the nano silicon dioxide to obtain a dispersion solution 1.
(4) Adding the ethylene-vinyl acetate rubber powder with the formula ratio into the dispersion liquid, and performing ultrasonic treatment to uniformly disperse the ethylene-vinyl acetate rubber powder into the dispersion liquid to obtain a dispersion liquid 2, namely the liquid accelerator for sprayed concrete.
Comparative example 1
The same procedure as in example 1 was repeated except that the unmodified nanosilica of Synthesis example 1 was used in place of the carboxylated modified nanosilica.
Comparative example 2
The same as in example 1 was used except that triethanolamine was used in an equal amount instead of diethanolisopropanolamine.
Comparative example 3
The same procedure as in example 1 was repeated except that no ethylene-vinyl acetate rubber powder was added.
Performance test of setting accelerators
The liquid accelerators for shotcrete of examples 1-2 and comparative examples 1-3 were added to the cement paste. The cement is standard cement (P.I 42.5, available from Beijing Beichuanghuayu science and technology Co., Ltd.). The setting time of the cement was carried out in accordance with "quick setting agent for shotcrete" (GBT 35159-2017), and the water-cement ratio was 0.4. When the water-cement ratio is calculated, the water in the accelerator is deducted from the total water-cement ratio. The temperature is 20 ℃ and the relative humidity is more than 90 percent. And (4) after the accelerator is added into the cement paste, timing is started, and initial setting time and final setting time are recorded.
The method comprises the steps of mixing the accelerator and cement together, stirring, adding standard sand after fully and uniformly mixing, adding the liquid accelerator into the mixture, and detecting the strength of the sand-mud mortar according to the national standard accelerator for sprayed concrete (GB/T35159-2017). The experimental standard sand meets the related requirements of GB/T178-: 0.5. when the water-cement ratio is calculated, the water in the accelerator is deducted from the total water-cement ratio. The temperature was 20 ℃. Cement mortar without an accelerator added was used as a reference sample for calculating the compressive strength ratio. Maintaining according to the related requirements of GBT35159-2017, recording and calculating the compressive strength of the 1 st day and the 28 th day and the compressive strength ratio of the 28 th day after four weeks at the related strength of the 1 st day and the 28 th day respectively.
See table 1 for results.
TABLE 1
| Initial setting time(s) | Final setting time(s) | Day 1 compressive Strength (MPa) | Compressive Strength (MPa) on day 28 | Compression strength ratio at day 28 (%) | |
| Example 1 | 126 | 385 | 18.1 | 67.6 | 104.8 |
| Example 2 | 143 | 402 | 17.8 | 65.9 | 103.9 |
| Comparative example 1 | 187 | 469 | 13.3 | 60.2 | 97.5 |
| Comparative example 2 | 210 | 524 | 15.6 | 59.3 | 99.1 |
| Comparative example 3 | 137 | 399 | 16.2 | 63.7 | 102.6 |
As can be seen from table 1, the carboxylated modified nano-silica has significant effects on improving mechanical properties and quick setting effect, and the organic alcohol amine compound has similar effects; the ethylene-vinyl acetate rubber powder only plays a significant role in improving the quick setting effect.
Furthermore, it should be understood that various changes, substitutions, deletions, modifications or adjustments may be made by those skilled in the art after reading the disclosure of the present invention, and such equivalents are also within the scope of the invention as defined in the appended claims.
Claims (10)
1. A liquid accelerator for tunnel concrete, which is characterized by comprising aluminum sulfate, modified silicon dioxide, magnesium fluosilicate, organic carboxylic acid and organic hydroxylamine compound.
2. The liquid accelerator according to claim 1, wherein the content of aluminum sulfate is 44 to 50% and the content of magnesium fluorosilicate is 2 to 5% based on the total weight of the liquid accelerator.
3. The liquid accelerator according to claim 1, wherein the modified silica is selected from carboxylated modified nanosilica; advantageously, the content of the modified silica is 4 to 7% based on the total weight of the liquid accelerator.
4. The liquid accelerator according to claim 3, wherein the carboxylated modified nano silica is prepared by reacting nano silica, KH-550 and succinic anhydride at 60-100 ℃.
5. The liquid accelerator according to claim 4, wherein the nanosilica has an average particle diameter of 10 to 30nm and a specific surface area of 500m or more 2 (iv)/g, hydrophilic; and/or the weight ratio of the nano silicon dioxide, the KH-550 and the succinic anhydride is 10: (10-15): (5-6).
6. The liquid accelerator according to claim 1, wherein the organic carboxylic acid is selected from glycolic acid; advantageously, the content of organic carboxylic acid is 1-4% based on the total weight of the liquid accelerator.
7. The liquid accelerator according to claim 1, wherein the organic hydroxylamine compound is selected from the group consisting of triethanolamine and diethanolisopropanolamine; advantageously, the content of organic hydroxylamine compound is 4-8% based on the total weight of the liquid accelerator; and/or the weight ratio of the triethanolamine to the diethanolisopropanolamine is 1: (0.5-1).
8. The liquid accelerator according to claim 1, wherein the liquid accelerator further comprises ethylene-vinyl acetate rubber powder; advantageously, the ethylene-vinyl acetate gel powder is present in an amount of 0.5 to 2%, based on the total weight of the liquid accelerator.
9. The liquid accelerator according to claim 1, wherein the liquid accelerator consists of:
44-50% of aluminum sulfate;
4-7% of carboxyl modified nano silicon dioxide;
2-5% of magnesium fluosilicate;
3-5% of triethanolamine;
1-3% of diethanol monoisopropanolamine;
1-4% of glycolic acid;
0.5 to 2 percent of ethylene-vinyl acetate rubber powder;
the balance of distilled water.
10. The preparation method of the liquid accelerator for tunnel concrete according to claim 9, characterized by comprising:
(1) adding aluminum sulfate and magnesium fluosilicate with the formula ratio into distilled water, heating to 40-80 ℃, and dissolving by ultrasonic to obtain a solution 1;
(2) uniformly mixing the diethanol monoisopropanolamine and the glycolic acid according to the formula ratio to obtain a mixed solution; then, dropwise adding the mixed solution into the solution 1 to obtain a solution 2;
(3) adding the carboxylated modified nano silicon dioxide with the formula amount into the solution 2, and performing ultrasonic treatment to uniformly disperse the nano silicon dioxide to obtain a dispersion solution 1;
(4) adding the ethylene-vinyl acetate rubber powder with the formula ratio into the dispersion liquid, and performing ultrasonic treatment to uniformly disperse the ethylene-vinyl acetate rubber powder into the dispersion liquid to obtain a dispersion liquid 2, namely the liquid accelerator for sprayed concrete.
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