CN113354326A - Green environment-friendly liquid accelerator and preparation method thereof - Google Patents
Green environment-friendly liquid accelerator and preparation method thereof Download PDFInfo
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- CN113354326A CN113354326A CN202110735637.5A CN202110735637A CN113354326A CN 113354326 A CN113354326 A CN 113354326A CN 202110735637 A CN202110735637 A CN 202110735637A CN 113354326 A CN113354326 A CN 113354326A
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- green environment
- friendly liquid
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- liquid alkali
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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)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a green environment-friendly liquid alkali-free accelerator and a preparation method thereof, wherein the liquid accelerator adopts a normal-temperature preparation method, and has the advantages of simple production process, short production period, low energy consumption, green environment protection; the liquid accelerator is added, so that the initial setting time and the final setting time of cement can be greatly shortened, the construction efficiency is improved, and the early strength of the sprayed concrete is high without loss of later strength. Meanwhile, the accelerator is good in homogeneity, can be stored for a long time, has no pungent smell, has no pollution to the environment, and is a green environment-friendly liquid accelerator with high cost performance and wide application range.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a green environment-friendly liquid accelerator and a preparation method thereof.
Background
The accelerator is an additive which can make concrete quickly set and hardened so as to obtain early strength. The method is mainly applied to the project of spraying concrete and mortar, and provides guarantee for the safe and efficient operation of the projects such as tunnel project, slope reinforcement, spray anchor support, leakage stoppage, first-aid repair and the like.
The properties of the accelerator in China can be mainly divided into powder accelerator and liquid accelerator, the powder accelerator is mainly used for dry spraying, and the defects of large dust, nonuniform stirring, large rebound quantity and the like exist in the construction process. The most important liquid used at present is an alkaline accelerator, and the main defects are as follows: (1) the energy consumption is large in the production process, and the environmental pollution is serious; (2) the construction has more dust, large alkalinity and strong corrosivity; (3) the resilience is large, and the primary spraying layer is thin; (4) the later strength loss of the concrete is large; (5) poor durability of concrete, etc. In view of the above, in recent years, domestic researchers have made a lot of researches on the preparation and the action mechanism of the alkali-free liquid accelerator, the invention of the alkali-free liquid accelerator greatly reduces the alkali content of the accelerator, so that the alkali-free liquid accelerator is safe and environment-friendly in construction and use, and meanwhile, the application of the alkali-free accelerator can greatly improve the later strength and durability of sprayed concrete. However, the liquid alkali-free accelerator developed at present has the problems of high mixing amount, easy layering and precipitation, poor adaptability, high cost and the like. In addition, most of the existing liquid alkali-free setting accelerators require 60-80 ℃ to be heated in the preparation process so as to promote the dissolution of the flaky aluminum sulfate, and irritant gas is easily generated in the production process, so that the requirements of environmental protection cannot be met.
Disclosure of Invention
The invention provides a green environment-friendly liquid accelerator which is prepared by a normal-temperature preparation method, and has the advantages of simple production process, short production period, low energy consumption and environmental friendliness.
In order to achieve the purpose, the invention provides the following technical scheme: the green environment-friendly liquid accelerator comprises the following components in percentage by mass: aluminum sulfate: 42% -46%, nano silica sol: 2.5% -3.5%, organic acid: 0.5% -0.75%, inorganic acid: 0.1% -0.3%, composite silicate: 1.0% -1.5%, ferrous sulfate: 3.0% -3.2%, pH regulator: 0.2% -0.5%, alcohol amine: 2.0 to 2.5 percent of water, and the balance of bottom water.
Preferably, the aluminum sulfate is aluminum sulfate flake sulfate octadecahydrate.
Preferably, the nano-silica sol is a nano-silica sol with a concentration of 50%.
Preferably, the organic acid is formic acid at a concentration of 85%.
Preferably, the inorganic acid is 85% phosphoric acid.
Preferably, the complex silicate is a 2.5% strength magnesium lithium silicate solution.
Preferably, the ferrous sulfate is high-grade ferrous sulfate heptahydrate.
Preferably, the pH adjusting agent is 2-amino-2-methyl-1-propanol.
Preferably, the alcohol amine is diethanol monoisopropanolamine at a concentration of 85%.
Preferably, the preparation method comprises the following steps:
adding phosphoric acid and formic acid into bottom water, uniformly stirring, then adding lithium magnesium silicate into an acid solution, uniformly stirring, adding silica sol, stirring for 10min, adding diethanol monoisopropanolamine, stirring for 30min, uniformly mixing, adding ferrous sulfate, and stirring for 40min until the ferrous sulfate is completely dissolved to obtain a thick mixed solution with consistency;
and step two, diluting the viscous mixed solution by adding water, adding a pH regulator, uniformly stirring, finally adding sheet aluminum sulfate at the temperature of 15-25 ℃, and stirring at the rotating speed of 150-200r/min for 40-50min until the aluminum sulfate is completely dissolved, thereby obtaining the aluminum sulfate.
The invention has the beneficial effects that: the green environment-friendly liquid accelerator is added, so that the initial setting time and the final setting time of cement can be greatly shortened, the construction efficiency is improved, the early strength of the sprayed concrete is high, the later strength is not lost, and the durability of the sprayed concrete can be greatly improved. Meanwhile, the accelerator is not easy to be layered and precipitated, can be stored for a long time, has no pungent smell, has no pollution to the environment, and is a green environment-friendly liquid accelerator with high cost performance and wide application range.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The green environment-friendly liquid accelerator comprises the following components in percentage by mass: aluminum sulfate: 42% -46%, nano silica sol: 2.5% -3.5%, organic acid: 0.5% -0.75%, inorganic acid: 0.1% -0.3%, composite silicate: 1.0% -1.5%, ferrous sulfate: 3.0% -3.2%, pH regulator: 0.2% -0.5%, alcohol amine: 2.0 to 2.5 percent of water, and the balance of bottom water. Wherein the aluminum sulfate is octadecahydrate flaky aluminum sulfate sulfur; the nano-silica sol is 50% nano-silica sol; the organic acid is formic acid with the concentration of 85%; the inorganic acid is phosphoric acid with the concentration of 85 percent; the composite silicate is a lithium magnesium silicate solution with the concentration of 2.5 percent; the ferrous sulfate is high-grade ferrous sulfate heptahydrate; the pH regulator is 2-amino-2-methyl-1-propanol (AMP-95) and the alcohol amine is 85% diethanolisopropanolamine.
The preparation method comprises the following steps:
adding phosphoric acid and formic acid into bottom water, uniformly stirring, then adding lithium magnesium silicate into an acid solution, uniformly stirring, adding silica sol, stirring for 10min, adding diethanol monoisopropanolamine, stirring for 30min, uniformly mixing, adding ferrous sulfate, and stirring for 40min until the ferrous sulfate is completely dissolved to obtain a thick mixed solution with consistency;
and step two, diluting the viscous mixed solution by adding water, adding a pH regulator, uniformly stirring, finally adding sheet aluminum sulfate at the temperature of 15-25 ℃, and stirring at the rotating speed of 150-200r/min for 40-50min until the aluminum sulfate is completely dissolved, thereby obtaining the aluminum sulfate.
In the actual cement hydration process, the hydration rate of the C3A is the fastest, and in order to prevent the cement from generating the phenomena of false setting or flash setting, gypsum (CaSO4.2H2O) is usually added as a setting regulator of the cement. On one hand, the liquid accelerator contains a large amount of aluminum sulfate, so that the concentration of Al3+ in a cement hydration system is increased, and a good coagulation accelerating effect is achieved. On the other hand, formic acid (COOH) can react with CaSO4.2H2O to generate (calcium formate) C2H2O4Ca insoluble matter, so that the coagulation regulating effect of gypsum is eliminated, and the COOH can also react with a part of hydration product Calcium Hydroxide (CH) of C3S to generate calcium formate insoluble matter, so that the hydration rate of C3S is promoted, and certain coagulation promoting and early strength effects are achieved.
Ionization of H + and Mg2+ from the silicon magnesium lithium acid in an acid system can generate chemical reaction with silicate generated in the cement hydration process, thereby generating gel chemical reaction as follows.
The lithium magnesium silicate is a good cement coagulant and early strength agent, and simultaneously has a certain precipitation prevention stabilizing effect in a water-based system, and Li < + > can effectively prevent the concrete from generating alkali aggregate reaction.
The alcohol amine has good early strength function, is used as a strong alkaline substance, has a certain excitation function on cement, promotes the hydration rate of the cement to a certain extent, has certain coagulation acceleration and early strength performance when existing in cement paste, and can further improve the compressive strength, compactness and impermeability of the concrete because the nano silicon dioxide can fill capillary pores in the concrete in the cement hydration process.
Guanidine carbonate is an organic strong base, and the pH value of the accelerator system can be effectively adjusted by the aqueous solution of guanidine carbonate, so that the green environmental protection property of the accelerator is ensured, and the influence on the early strength and durability of sprayed concrete caused by too low pH value of the accelerator is avoided.
In the cement hydration process, the hydration rate of C3A is the fastest, next, C4AF is added, a certain amount of ferrous sulfate is added, the concentration of Fe2+ in a cement hydration system is improved, the content of iron mineral phase in cement is effectively supplemented, and a certain coagulation promoting effect is achieved.
In the preparation method, the feeding sequence for preparing the accelerator is that firstly inorganic and organic acids are added into a small amount of water, magnesium lithium silicate solution is added, silica sol is added, diethanol monoisopropanolamine is added, ferrous sulfate is added, then water is added for dilution, pH regulator is added, and finally aluminum sulfate is added.
The following table shows 4 specific examples of the present invention, and the percentages of the components in each example are percentages by mass.
| Examples | 1 | 2 | 3 | 4 |
| Aluminium sulphate | 42％ | 44％ | 45％ | 46％ |
| Silica sol | 2.5％ | 2.8％ | 3.2％ | 3.5％ |
| Organic acids | 0.50％ | 0.55％ | 0.65％ | 0.70％ |
| Inorganic acid | 0.10％ | 0.15％ | 0.25％ | 0.30％ |
| Composite silicate | 1.0％ | 1.2％ | 1.5％ | 1.3％ |
| Ferrous sulfate | 3.0％ | 3.1％ | 3.2％ | 3.2％ |
| pH regulator | 0.2％ | 0.3％ | 0.4％ | 0.5％ |
| Alcohol amines | 2.0％ | 2.2％ | 2.4％ | 2.5％ |
| Water (W) | 48.7％ | 45.7％ | 43.4％ | 42.0％ |
The green environment-friendly alkali-free liquid accelerator in the embodiment 1 is prepared by the following steps:
the first step is as follows: adding a mixed solution of 0.10% phosphoric acid and 0.50% formic acid into 15.7% bottom water, uniformly stirring, then adding a 1.0% magnesium lithium silicate solution into an acid solution, uniformly stirring, adding 2.5% silica sol, stirring for 10min, adding 2.0% diethanol monoisopropanolamine, uniformly stirring for 30min, adding 3.0% ferrous sulfate, and stirring for 40min until the mixture is completely dissolved to obtain a mixed solution with a certain consistency;
the second step is that: and (3) diluting the obtained viscous mixed solution by adding 33% of water, then adding 0.2% of pH regulator, uniformly stirring, finally adding 42% of sheet aluminum sulfate, stirring at the normal temperature (about 20 ℃) at the rotating speed of 150-200r/min for 40-50min, and obtaining the accelerator after the aluminum sulfate is completely dissolved.
The performance indexes of the environment-friendly liquid alkali-free accelerator prepared in the embodiment at 6% mixing amount are as follows:
the green environment-friendly alkali-free liquid accelerator in the embodiment 2 is prepared by the following steps:
the first step is as follows: adding a mixed solution of 0.15% phosphoric acid and 0.55% formic acid into 14.7% bottom water, uniformly stirring, then adding a 1.2% magnesium lithium silicate solution into an acid solution, uniformly stirring, adding 2.8% silica sol, stirring for 10min, adding 2.2% diethanol monoisopropanolamine, uniformly stirring for 30min, adding 3.2% ferrous sulfate, and stirring for 40min until the mixture is completely dissolved to obtain a mixed solution with a certain consistency;
the second step is that: diluting the obtained viscous mixed solution with 31% of water, adding 0.3% of pH regulator, uniformly stirring, finally adding 44% of sheet aluminum sulfate, stirring at normal temperature (about 20 ℃) for 40-50min at the rotating speed of 150-200r/min, and obtaining the accelerator after the aluminum sulfate is completely dissolved.
The performance indexes of the environment-friendly liquid alkali-free accelerator prepared in the embodiment at 6% mixing amount are as follows:
the green environment-friendly alkali-free liquid accelerator in the embodiment 3 is prepared by the following steps:
the first step is as follows: adding a mixed solution of 0.25% phosphoric acid and 0.65% formic acid into 13.4% bottom water, uniformly stirring, then adding a 1.5% magnesium lithium silicate solution into an acid solution, uniformly stirring, adding 3.2% silica sol, stirring for 10min, adding 2.4% diethanol monoisopropanolamine, uniformly stirring for 30min, adding 3.2% ferrous sulfate, and stirring for 40min until the mixture is completely dissolved to obtain a mixed solution with a certain consistency;
the second step is that: and diluting the obtained viscous mixed solution by adding 30% of water, adding 0.4% of pH regulator, uniformly stirring, finally adding 45% of sheet aluminum sulfate, stirring at normal temperature (about 20 ℃) for 40-50min at the rotating speed of 150-200r/min, and obtaining the accelerator after the aluminum sulfate is completely dissolved.
The performance indexes of the environment-friendly liquid alkali-free accelerator prepared in the embodiment at 6% mixing amount are as follows:
the green environment-friendly alkali-free liquid accelerator in the embodiment 4 is prepared by the following steps:
the first step is as follows: adding a mixed solution of 0.30% phosphoric acid and 0.70% formic acid into 13.0% bottom water, uniformly stirring, then adding a 1.3% magnesium lithium silicate solution into an acid solution, uniformly stirring, adding 3.5% silica sol, stirring for 10min, adding 2.5% diethanol monoisopropanolamine, uniformly stirring for 30min, adding 3.2% ferrous sulfate, and stirring for 40min until the mixture is completely dissolved to obtain a mixed solution with a certain consistency;
the second step is that: and diluting the obtained viscous mixed solution with 29% of water, adding 0.5% of pH regulator, uniformly stirring, finally adding 46% of flake aluminum sulfate, stirring at normal temperature (about 20 ℃) for 40-50min at the rotating speed of 150-200r/min, and obtaining the accelerator after the aluminum sulfate is completely dissolved.
The performance indexes of the environment-friendly liquid alkali-free accelerator prepared in the embodiment at 6% mixing amount are as follows:
the above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The green environment-friendly liquid accelerator is characterized by comprising the following components in percentage by mass:
aluminum sulfate: 42% -46%, nano silica sol: 2.5% -3.5%, organic acid: 0.5% -0.75%, inorganic acid: 0.1% -0.3%, composite silicate: 1.0% -1.5%, ferrous sulfate: 3.0% -3.2%, pH regulator: 0.2% -0.5%, alcohol amine: 2.0 to 2.5 percent of water, and the balance of bottom water.
2. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the aluminum sulfate is eighteen hydrated flaky aluminum sulfate sulfur.
3. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the nano-silica sol is 50% nano-silica sol.
4. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the organic acid was formic acid at 85% concentration.
5. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the inorganic acid is phosphoric acid with a concentration of 85%.
6. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the composite silicate is a 2.5% concentration magnesium lithium silicate solution.
7. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the ferrous sulfate is high-grade ferrous sulfate heptahydrate.
8. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the pH regulator is 2-amino-2-methyl-1-propanol.
9. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the alcohol amine is 85% diethanol monoisopropanolamine.
10. The green environment-friendly liquid alkali-free accelerator according to claim 1, characterized in that: the preparation method comprises the following steps:
adding phosphoric acid and formic acid into bottom water, uniformly stirring, then adding lithium magnesium silicate into an acid solution, uniformly stirring, adding silica sol, stirring for 10min, adding diethanol monoisopropanolamine, stirring for 30min, uniformly mixing, adding ferrous sulfate, and stirring for 40min until the ferrous sulfate is completely dissolved to obtain a thick mixed solution with consistency;
and step two, diluting the viscous mixed solution by adding water, adding a pH regulator, uniformly stirring, finally adding sheet aluminum sulfate at the temperature of 15-25 ℃, and stirring at the rotating speed of 150-200r/min for 40-50min until the aluminum sulfate is completely dissolved, thereby obtaining the aluminum sulfate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804713A (en) * | 2022-04-13 | 2022-07-29 | 江西建衡环保科技有限公司 | Preparation method and application of polyaluminium sulfate modified accelerator |
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