CN112159146A - Novel environment-friendly alkali-free accelerator for concrete spraying and preparation process thereof - Google Patents
Novel environment-friendly alkali-free accelerator for concrete spraying and preparation process thereof Download PDFInfo
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- CN112159146A CN112159146A CN202011097178.4A CN202011097178A CN112159146A CN 112159146 A CN112159146 A CN 112159146A CN 202011097178 A CN202011097178 A CN 202011097178A CN 112159146 A CN112159146 A CN 112159146A
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- novel environment
- concrete spraying
- accelerator
- aluminum
- free accelerator
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of concrete materials, and discloses a novel environment-friendly alkali-free accelerator for concrete spraying and a preparation process thereof, wherein the accelerator comprises the following raw materials in parts by weight: 41-57% of aluminum sulfate, 5-8% of aluminum hydroxide, 24-27% of hydrofluoric acid, 0.05-0.1% of organic acid, 0.1-0.2% of organic alcohol amine, 0.05-0.1% of polyacrylamide and the balance of water. The invention provides a novel environment-friendly alkali-free accelerator for concrete spraying and a preparation process thereof.
Description
Technical Field
The invention relates to the field of concrete materials, in particular to a novel environment-friendly alkali-free accelerator for concrete spraying and a preparation process thereof.
Background
Concrete, referred to as "concrete" for short: the concrete is a general term for engineering composite materials formed by cementing aggregate into a whole by cementing materials, and the term of concrete generally refers to that cement is used as the cementing materials, and sand and stone are used as the aggregate; the cement concrete, also called as common concrete, is obtained by mixing the cement concrete and water according to a certain proportion and stirring, and is widely applied to civil engineering; the accelerator is used as an important additive in sprayed concrete, can obviously shorten the setting and hardening time of the concrete, is widely applied to T courses such as mines, underground, tunnels, water diversion, leakage stoppage, dam slope protection reinforcement, mine roadway support and the like, is subjected to early-stage alkaline powdery to short-term high-alkali, low-alkali and alkali-free liquid accelerators, is matched with sprayed concrete by a dry spraying method to use the powdery accelerator, and belongs to an after-eliminating application process because the powdery accelerator is not uniformly mixed with a mixture, the metering is not accurate, the dust amount in construction is large, the resilience is also large, and the ambient atmosphere is seriously polluted.
In recent years, liquid accelerators have been rapidly developed along with the application of wet sprayed concrete, the wet spraying technology has the advantages of guaranteed quality, high efficiency, low resilience and the like due to construction, the traditional dry spraying technology is gradually replaced, meanwhile, the high-alkalinity accelerator has extremely strong corrosivity and can cause great damage to constructors, the alkali aggregate reaction is easily caused, the concrete durability is reduced, the later strength loss is serious, and the 28d compressive strength retention rate is only about 65% or so 4 generally, so that the novel liquid accelerator with low alkali content, wide application range and excellent performance is preferred.
Technical problems existing in the prior art
In order to solve the problems, the application provides a novel environment-friendly alkali-free accelerator for concrete spraying and a preparation process thereof.
Disclosure of Invention
Objects of the invention
The invention provides a novel environment-friendly alkali-free accelerator for concrete spraying and a preparation process thereof, aiming at solving the technical problems in the background art.
(II) technical scheme
In order to solve the problems, the invention provides a novel environment-friendly alkali-free accelerator for concrete spraying, which is characterized by comprising the following raw materials in parts by weight: 41-57% of aluminum sulfate, 5-8% of aluminum hydroxide, 24-27% of hydrofluoric acid, 0.05-0.1% of organic acid, 0.1-0.2% of organic alcohol amine, 0.05-0.1% of polyacrylamide and the balance of water.
Preferably, the raw materials in the following proportion: 41-49% of aluminum sulfate, 5-6.5% of aluminum hydroxide, 24-25.5% of hydrofluoric acid, 0.05-0.07% of organic acid, 0.1-0.15% of organic alcohol amine, 0.05-0.75% of polyacrylamide and the balance of water.
Preferably, the feed consists of the following raw materials in proportion: 49-57% of aluminum sulfate, 6.5-8% of aluminum hydroxide, 25.5-27% of hydrofluoric acid, 0.07-0.1% of organic acid, 0.15-0.2% of organic alcohol amine, 0.75-0.1% of polyacrylamide and the balance of water.
A novel environment-friendly alkali-free accelerator for concrete spraying is prepared by the following specific preparation process:
s1, weighing the components according to the mass ratio;
s2, slowly adding aluminum hydroxide into hydrofluoric acid while stirring to obtain an aluminum fluoride solution for later use;
s3, adding aluminum sulfate into water, stirring until it is completely dissolved
And S4, mixing and stirring the aluminum fluoride solution and the aluminum sulfate solution, slowly adding organic alcohol amine, organic acid and polyacrylamide, and stirring until a uniform liquid is formed.
Preferably, in S2, the operation is performed at room temperature, and the aluminum fluoride solution is obtained after completion of the exothermic reaction.
Preferably, in S3, the mixture of aluminum sulfate and water is stirred at a temperature of 60-65 ℃.
Preferably, in S4, the final accelerator is a milky white liquid in appearance and has a density of 1.3-1.4g/cm3And has good fluidity and stability.
The technical scheme of the invention has the following beneficial technical effects:
can effectually increase the cohesiveness of concrete, reduce resilience volume and dust volume, reduce setting time, ensure shotcrete later stage intensity.
Drawings
FIG. 1 is a flow chart of the novel environment-friendly alkali-free accelerator for concrete spraying and the preparation process thereof.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings 1 in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
The invention provides a novel environment-friendly alkali-free accelerator for concrete spraying, which is characterized by comprising the following raw materials in parts by weight: 41% of aluminum sulfate, 5% of aluminum hydroxide, 24% of hydrofluoric acid, 0.05% of organic acid, 0.1% of organic alcohol amine, 0.05% of polyacrylamide and the balance of water.
A novel environment-friendly alkali-free accelerator for concrete spraying is prepared by the following specific preparation process:
s1, weighing the components according to the mass ratio;
s2, slowly adding aluminum hydroxide into hydrofluoric acid while stirring to obtain an aluminum fluoride solution for later use;
s3, adding aluminum sulfate into water, stirring until it is completely dissolved
And S4, mixing and stirring the aluminum fluoride solution and the aluminum sulfate solution, slowly adding organic alcohol amine, organic acid and polyacrylamide, and stirring until a uniform liquid is formed.
In an alternative embodiment, in S2, the process is performed at normal temperature, and the aluminum fluoride solution is obtained after the exothermic reaction is completed.
In an alternative embodiment, the mixture of aluminum sulfate and water is stirred at a temperature of 60 ℃ in S3.
In an alternative embodiment, in S4, the final accelerator is a milky white liquid in appearance and has a density of 1.3/cm3And has good fluidity and stability.
Example 2
In an optional embodiment, the composition of the following raw materials is as follows: 49% of aluminum sulfate, 6.5% of aluminum hydroxide, 25.5% of hydrofluoric acid, 0.07% of organic acid, 0.15% of organic alcohol amine, 0.75% of polyacrylamide and the balance of water.
A novel environment-friendly alkali-free accelerator for concrete spraying is prepared by the following specific preparation process:
s1, weighing the components according to the mass ratio;
s2, slowly adding aluminum hydroxide into hydrofluoric acid while stirring to obtain an aluminum fluoride solution for later use;
s3, adding aluminum sulfate into water, stirring until it is completely dissolved
And S4, mixing and stirring the aluminum fluoride solution and the aluminum sulfate solution, slowly adding organic alcohol amine, organic acid and polyacrylamide, and stirring until a uniform liquid is formed.
In an alternative embodiment, in S2, the process is performed at normal temperature, and the aluminum fluoride solution is obtained after the exothermic reaction is completed.
In an alternative embodiment, the mixture of aluminum sulfate and water is stirred at a temperature of 65 ℃ in S3.
In an alternative embodiment, in S4, the final accelerator is a milky white liquid in appearance and has a density of 1.4g/cm3And has good fluidity and stability.
Example 3
In an optional embodiment, the material composition comprises the following raw materials in proportion: 54% of aluminum sulfate, 7% of aluminum hydroxide, 26% of hydrofluoric acid, 0.08% of organic acid, 0.17% of organic alcohol amine, 0.8% of polyacrylamide and the balance of water.
A novel environment-friendly alkali-free accelerator for concrete spraying is prepared by the following specific preparation process:
s1, weighing the components according to the mass ratio;
s2, slowly adding aluminum hydroxide into hydrofluoric acid while stirring to obtain an aluminum fluoride solution for later use;
s3, adding aluminum sulfate into water, stirring until it is completely dissolved
And S4, mixing and stirring the aluminum fluoride solution and the aluminum sulfate solution, slowly adding organic alcohol amine, organic acid and polyacrylamide, and stirring until a uniform liquid is formed.
In an alternative embodiment, in S2, the process is performed at normal temperature, and the aluminum fluoride solution is obtained after the exothermic reaction is completed.
In an alternative embodiment, the mixture of aluminum sulfate and water is stirred at a temperature of 62 ℃ in S3.
At one endIn an alternative embodiment, in S4, the final accelerator is a milky white liquid in appearance and has a density of 1.4g/cm3And has good fluidity and stability.
Example 4
Test of
Selecting the cement setting time and the cement mortar strength of the accelerator blended in the concrete of example 1, example 2 and example 3; according to GB/T35159-2017 accelerator for sprayed concrete, the average value of various performance indexes is shown in the following table:
TABLE 1
The relationship between the addition amount of the cement of examples 1 to 3 and the average value of the setting time and the strength of the cement is determined by taking the reference cement as a cementing material, and the results are shown in the following table:
TABLE 2
According to the above table, the accelerator in examples 1-3 promotes the hydration process of cement, the setting time becomes shorter gradually with the increase of the mixing amount, when the mixing amount is more than 5%, the ratio of the 1d compressive strength and the 28d compressive strength of the setting time meets the requirements in table 1, the cement is qualified, when the using amount of the accelerator is increased from 5% to 7%, the final setting time is reduced by 8.9min, and the influence on the final setting time is more obvious; from the test results, when the mixing amount of the quick-setting admixture is 5% -8%, the 1d compressive strength reaches dozens of megapascals, and the 28d compressive strength ratio is not lost and is more than 100%, and the quick-setting admixture in the examples 1-3 can obviously increase the later strength of the mortar within a proper dosage range.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. The novel environment-friendly alkali-free accelerator for concrete spraying is characterized by comprising the following raw materials in parts by weight: 41-57% of aluminum sulfate, 5-8% of aluminum hydroxide, 24-27% of hydrofluoric acid, 0.05-0.1% of organic acid, 0.1-0.2% of organic alcohol amine, 0.05-0.1% of polyacrylamide and the balance of water.
2. The novel environment-friendly alkali-free accelerator for concrete spraying according to claim 1 is characterized by comprising the following raw materials in parts by weight: 41-49% of aluminum sulfate, 5-6.5% of aluminum hydroxide, 24-25.5% of hydrofluoric acid, 0.05-0.07% of organic acid, 0.1-0.15% of organic alcohol amine, 0.05-0.75% of polyacrylamide and the balance of water.
3. The novel environment-friendly alkali-free accelerator for concrete spraying according to claim 1 is characterized by comprising the following raw materials in parts by weight: 49-57% of aluminum sulfate, 6.5-8% of aluminum hydroxide, 25.5-27% of hydrofluoric acid, 0.07-0.1% of organic acid, 0.15-0.2% of organic alcohol amine, 0.75-0.1% of polyacrylamide and the balance of water.
4. The novel environment-friendly alkali-free accelerator for concrete spraying according to claims 1 to 3, which is characterized by comprising the following specific preparation processes:
s1, weighing the components according to the mass ratio;
s2, slowly adding aluminum hydroxide into hydrofluoric acid while stirring to obtain an aluminum fluoride solution for later use;
s3, adding aluminum sulfate into water, stirring until it is completely dissolved
And S4, mixing and stirring the aluminum fluoride solution and the aluminum sulfate solution, slowly adding organic alcohol amine, organic acid and polyacrylamide, and stirring until a uniform liquid is formed.
5. The novel environment-friendly alkali-free accelerator for concrete spraying as claimed in claim 4 and the preparation process thereof, wherein the operation is carried out at normal temperature in S2, and the aluminum fluoride solution is obtained after the exothermic reaction is completed.
6. The novel environment-friendly alkali-free accelerator for concrete spraying as claimed in claim 1, wherein the mixed solution of aluminum sulfate and water is stirred at a temperature of 60-65 ℃ in S3.
7. The novel environment-friendly alkali-free accelerator for concrete spraying as claimed in claim 1, wherein in S4, the accelerator is milky white liquid with density of 1.3-1.4g/cm3And has good fluidity and stability.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011097178.4A CN112159146A (en) | 2020-10-14 | 2020-10-14 | Novel environment-friendly alkali-free accelerator for concrete spraying and preparation process thereof |
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| CN202011097178.4A CN112159146A (en) | 2020-10-14 | 2020-10-14 | Novel environment-friendly alkali-free accelerator for concrete spraying and preparation process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735961A (en) * | 2022-02-23 | 2022-07-12 | 武汉源锦建材科技有限公司 | Solid-liquid dual-purpose alkali-free accelerator and preparation method and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029801A (en) * | 2000-06-21 | 2002-01-29 | Sika Ag | Setting and hardening accelerator containing no sulfate or alkali |
| KR101302475B1 (en) * | 2013-03-25 | 2013-09-02 | (주) 에이텍정밀화학 | Quick setting agent and method for manufacturing thereof |
| CN104193211A (en) * | 2014-08-18 | 2014-12-10 | 刘翠芬 | Heating-free non-alkali liquid accelerator for jetting concrete and preparation method of heating-free non-alkali liquid accelerator |
| CN107586054A (en) * | 2017-09-06 | 2018-01-16 | 江苏尼高科技有限公司 | Gunite concrete alkali-free liquid accelerator and preparation method thereof |
| CN111646728A (en) * | 2020-07-01 | 2020-09-11 | 中建材中岩科技有限公司 | Quick-setting high-strength alkali-free liquid accelerator |
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2020
- 2020-10-14 CN CN202011097178.4A patent/CN112159146A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002029801A (en) * | 2000-06-21 | 2002-01-29 | Sika Ag | Setting and hardening accelerator containing no sulfate or alkali |
| KR101302475B1 (en) * | 2013-03-25 | 2013-09-02 | (주) 에이텍정밀화학 | Quick setting agent and method for manufacturing thereof |
| CN104193211A (en) * | 2014-08-18 | 2014-12-10 | 刘翠芬 | Heating-free non-alkali liquid accelerator for jetting concrete and preparation method of heating-free non-alkali liquid accelerator |
| CN107586054A (en) * | 2017-09-06 | 2018-01-16 | 江苏尼高科技有限公司 | Gunite concrete alkali-free liquid accelerator and preparation method thereof |
| CN111646728A (en) * | 2020-07-01 | 2020-09-11 | 中建材中岩科技有限公司 | Quick-setting high-strength alkali-free liquid accelerator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114735961A (en) * | 2022-02-23 | 2022-07-12 | 武汉源锦建材科技有限公司 | Solid-liquid dual-purpose alkali-free accelerator and preparation method and application thereof |
| CN114735961B (en) * | 2022-02-23 | 2023-03-10 | 武汉源锦建材科技有限公司 | Solid-liquid dual-purpose alkali-free accelerator and preparation method and application thereof |
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