CN113548825A - Solid master batch of fluoride-free alkali-free liquid accelerator and preparation and use methods thereof - Google Patents
Solid master batch of fluoride-free alkali-free liquid accelerator and preparation and use methods thereof Download PDFInfo
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- CN113548825A CN113548825A CN202110869559.8A CN202110869559A CN113548825A CN 113548825 A CN113548825 A CN 113548825A CN 202110869559 A CN202110869559 A CN 202110869559A CN 113548825 A CN113548825 A CN 113548825A
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- free
- master batch
- alkali
- liquid accelerator
- fluorine
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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
-
- 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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- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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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 discloses a solid master batch of a fluorine-free alkali-free liquid accelerator, which comprises the following components in percentage by mass: 45% -60% of aluminum sulfate; 10% -15% of amorphous aluminum hydroxide; 5 to 10 percent of magnesium sulfate; 3% -5% of a reinforcing agent; 3 to 8 percent of alcohol amine. The preparation method comprises the following steps: adding water and alcohol amine into a reaction kettle, stirring and heating to 70-90 ℃; adding aluminum sulfate, and continuously stirring for 1-2 h until the aluminum sulfate is completely dissolved; adding amorphous aluminum hydroxide, and continuously stirring for 2-3 h until the amorphous aluminum hydroxide is completely dissolved; adding manganese sulfate and magnesium sulfate, and continuously stirring for 1-2 h until the solid is completely dissolved; drying the liquid obtained in the fourth step by using a vacuum rake dryer, and stirring once to dehydrate the liquid until the liquid becomes paste; and cooling the paste to room temperature to obtain the milky-white accelerating agent solid master batch. The solid master batch is dissolved in water to form the alkali-free liquid accelerator, and has good application property; the obtained liquid accelerator has low viscosity and good stability.
Description
Technical Field
The invention relates to the technical field of building material additives, in particular to a solid master batch of a fluorine-free alkali-free liquid accelerator and a preparation and use method thereof.
Background
The accelerating agent is an additive for adjusting the setting and hardening speed of concrete or mortar, can accelerate the hydration of cement, obviously shortens the setting time, and is used for sprayed concrete construction. The main function of the accelerator is to make the newly sprayed material quickly coagulate, increase the thickness of one sprayed layer, shorten the time interval between two spraying, and improve the early strength of the sprayed concrete, so as to provide the support capability in time. The concrete constructed by adopting the spraying method becomes sprayed concrete, the sprayed concrete has the advantages that the common template pouring concrete cannot be compared, and particularly becomes a very important and necessary measure in modern underground engineering in anchor-spray supporting of various underground engineering. The method is mainly used for anchor-spraying support, leakage plugging and rush-repair of projects such as tunnels, wellways, slope protection and the like.
GB/T35159-2017 accelerator for sprayed concrete, which is implemented from 11/1/2018, has clear requirements on alkali-free accelerators. On the basis, the national iron group starts to implement a new technical standard QCR807-2020 liquid alkali-free accelerator for tunnel shotcrete at 31.3.2021, wherein the content of fluorine ions in the alkali-free liquid accelerator is definitely required to be less than or equal to 0.05 percent, so that the alkali-free accelerator for railways also needs to be free of fluorine, and the requirement on the pressure resistance is higher.
The prior art publication number CN110204238A discloses the name of the invention: a water-soluble powdery alkali-free accelerator and a preparation method thereof, wherein the accelerator comprises the following raw materials: aluminum sulfate, lithium silicate, manganese fluosilicate, a pH regulator, a suspension stabilizer and the balance of water. Wherein, 5 to 10 percent of manganese fluosilicate used does not meet the railway requirement, and the spray drying used in the drying process can lead the accelerator to lose all water by the drying spray, and the obtained powder is possibly difficult to dissolve. The invention discloses a dry and wet concrete spraying dual-purpose powdery alkali-free accelerator with the prior art publication number of CN112142359A and a preparation and use method thereof. However, the conditions of temperature and time for dissolving the powder in water are not described, and it is unknown whether the powder can be dissolved into a liquid alkali-free accelerator. The invention discloses a paste accelerator with the name of CN112723786A, which comprises the following components in percentage by mass: sodium carbonate, sodium sulfate, silicon dioxide, calcium formate and sodium hydroxymethyl cellulose. It is not suitable for railway use because it contains a large amount of alkali-containing raw materials. Patent CN110963741A discloses an early strength type powdery alkali-free liquid accelerator core masterbatch, a preparation method and an application thereof, wherein the core masterbatch still needs to be added with water, alcohol amine and aluminum sulfate under stirring condition for reaction to prepare the alkali-free liquid accelerator when in use, and the use condition is not simplified compared with the production of the traditional accelerator.
Based on the technical current situation, at present, a solid master batch of the alkali-free liquid setting accelerator is urgently needed, the alkali-free liquid setting accelerator can be quickly prepared on a construction site, the transportation cost of the liquid setting accelerator is greatly reduced, and the problems that the alkali-free liquid setting accelerator is poor in stability, difficult to store for a long time, high in transportation and packaging costs and the like are solved. And simultaneously meets the standards of GB/T35159-2017 accelerator for sprayed concrete and QCR807-2020 accelerator for liquid alkali-free accelerator for tunnel sprayed concrete.
Disclosure of Invention
1. The technical problem to be solved is as follows:
aiming at the technical problems, the invention provides a solid master batch of a fluorine-free alkali-free liquid accelerator and a preparation and use method thereof. The method is used for solving the problems of high packaging and transportation cost, easy separation and poor stability of low-temperature solution of the existing alkali-free accelerator.
2. The technical scheme is as follows:
a solid master batch of a fluoride-free alkali-free liquid accelerator is characterized in that: the composite material comprises the following components in percentage by mass:
aluminum sulfate: 45% -60%; amorphous aluminum hydroxide: 10% -15%; magnesium sulfate: 5% -10%; reinforcing agent: 3% -5%; alcohol amine: 3% -8%; the balance being water.
Further, the alcohol ammonia is one or two combination of diethanolamine, triethanolamine and dimethylethanolamine.
Further, the reinforcing agent is one or two of lithium oxide and manganese sulfate.
Further, the amorphous aluminum hydroxide is self-made in a laboratory, wherein the content of the aluminum oxide is 60-65%.
A preparation method of a solid master batch of a fluorine-free alkali-free liquid accelerator is used for preparing the solid master batch of the fluorine-free alkali-free liquid accelerator for railways, and comprises the following steps: the method comprises the following steps:
the method comprises the following steps: adding water and alcohol amine into a reaction kettle, stirring and heating to 70-90 ℃.
Step two: adding aluminum sulfate, and continuously stirring for 1-2 h until the aluminum sulfate is completely dissolved.
Step three: adding amorphous aluminum hydroxide, and continuously stirring for 2-3 h until completely dissolving.
Step four: manganese sulfate and magnesium sulfate are added, and stirring is continued for 1h-2h until the solid is completely dissolved.
Step five: and (4) drying the liquid obtained in the fourth step by using a vacuum rake dryer, and dehydrating the liquid into paste while stirring the liquid once.
Step six: and cooling the paste obtained in the fifth step to room temperature to obtain the milky-white accelerating agent solid master batch.
Furthermore, in the fourth step, the drying temperature of the vacuum rake dryer is 80-90 ℃, the pressure of the dryer is 0.1 time of atmospheric pressure, and the drying time is 3-5 h.
A method for using a solid master batch of a fluorine-free alkali-free liquid accelerator comprises the steps of mixing and stirring the solid master batch of the fluorine-free alkali-free liquid accelerator and water at a preset ratio for 10min to 20min at normal temperature to completely dissolve the solid master batch of the fluorine-free alkali-free liquid accelerator into the alkali-free liquid accelerator.
Further, the preset proportion is specifically as follows: the solid master batch is 50-60% by mass, and the water is 40-50% by mass.
Further, the alkali-free liquid accelerator is used in the wet-spraying concrete construction process, and the mixing amount of the alkali-free liquid accelerator is 6-8% of the mass of the glue material.
3. Has the advantages that:
(1) the invention provides a solid master batch of an alkali-free liquid accelerator, which is dissolved in water to form the alkali-free liquid accelerator and has good application property.
(2) The invention uses the rake vacuum drying method to produce the solid master batch of the accelerating agent, the solid 410 obtained by drying and cooling has high dissolving speed, no need of heating, and the obtained liquid accelerating agent has low viscosity and good stability.
(3) The solid master batch of the accelerator generated by the invention only accounts for 50-60% of the mass of the liquid accelerator, so that the transportation and packaging cost of the liquid accelerator can be greatly reduced, and the economy of long-distance transportation of the accelerator is improved.
(4) The alkali-free liquid accelerator prepared from the accelerator solid master batch prepared by the invention does not contain fluorinion and chloride ion, has alkali content less than 1 percent, and meets the standard requirements of national standard GB/T35159-2017 accelerator for sprayed concrete and national iron group QCR807-2020 accelerator for liquid alkali-free accelerator for tunnel sprayed concrete.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The examples will help to understand the present invention given the detailed embodiments and the specific operation procedures, but the scope of the present invention is not limited to the examples described below.
The accelerator solid master batches of examples 1-5 were prepared by the following procedure:
(1) adding water and alcohol amine into a reaction kettle, stirring and heating to 70 ℃; (2) adding aluminum sulfate, and continuously stirring for 1h until the aluminum sulfate is completely dissolved; (3) adding amorphous aluminum hydroxide, and continuously stirring for 2h until the amorphous aluminum hydroxide is completely dissolved; (4) adding an enhancer and magnesium sulfate, and continuously stirring for 1h until the solid is completely dissolved; (5) drying the liquid obtained in the step (4) by using a vacuum rake dryer, and stirring once to dehydrate the liquid until the liquid becomes paste; (6) and (5) cooling the paste obtained in the step (5) to room temperature to obtain the milky-white accelerating agent solid master batch. And (5) drying the vacuum rake dryer at the drying temperature of 80 ℃, wherein the pressure of the dryer is 0.1 time of the atmospheric pressure, and the drying time is 3 hours.
The corresponding raw material formulations in examples 1-5 are shown in table 1, the corresponding preparation conditions are shown in table 2, and the corresponding methods of use are shown in table 3:
TABLE 1 examples 1-5 raw material formulation of solid master batch of fluorine-free alkali-free liquid accelerator for railways
TABLE 2 preparation conditions of fluorine-free alkali-free liquid accelerator solid concentrates for railways of examples 1 to 5
TABLE 3. method of using fluorine-free alkali-free liquid accelerator solid master batch for railways of examples 1 to 5
The products of examples 1-5 were tested:
according to the test methods of the national iron group QCR 807-. Wherein the dosage of the accelerator is calculated according to the percentage of the weight of the cement. Cement paste setting time test cement 400g, water 140 g. The cement mortar strength test comprises 900g of cement, 1350g of standard sand and 450g of water. The amount of water used includes water contained in the liquid accelerator.
TABLE 4 Performance requirements of neat and mortar incorporating set accelerators
TABLE 5 relevant performance test results of the fluorine-free and alkali-free liquid accelerator for railways
The test results are shown in Table 5, and according to the standard analysis of the national iron group standard QCR 807-. The alkali-free accelerator prepared by the invention can meet the national standard requirement when the mixing amount is 7%.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A solid master batch of a fluoride-free alkali-free liquid accelerator is characterized in that: the composite material comprises the following components in percentage by mass:
aluminum sulfate: 45% -60%; amorphous aluminum hydroxide: 10% -15%; magnesium sulfate: 5% -10%; reinforcing agent: 3% -5%; alcohol amine: 3% -8%; the balance being water.
2. The solid master batch of the fluorine-free alkali-free liquid accelerator as claimed in claim 1, wherein: the alcohol ammonia is one or two of diethanolamine, triethanolamine and dimethylethanolamine.
3. The solid master batch of the fluorine-free alkali-free liquid accelerator as claimed in claim 1, wherein: the reinforcing agent is one or two of lithium oxide and manganese sulfate.
4. The solid master batch of the fluorine-free alkali-free liquid accelerator as claimed in claim 1, wherein: the amorphous aluminum hydroxide is self-made in a laboratory, wherein the content of aluminum oxide is 60-65%.
5. A method for preparing a solid master batch of a fluorine-free alkali-free liquid accelerator for railways according to any one of claims 1 to 4, which comprises the following steps: the method comprises the following steps:
the method comprises the following steps: adding water and alcohol amine into a reaction kettle, stirring and heating to 70-90 ℃;
step two: adding aluminum sulfate, and continuously stirring for 1-2 h until the aluminum sulfate is completely dissolved;
step three: adding amorphous aluminum hydroxide, and continuously stirring for 2-3 h until the amorphous aluminum hydroxide is completely dissolved;
step four: adding manganese sulfate and magnesium sulfate, and continuously stirring for 1-2 h until the solid is completely dissolved;
step five: drying the liquid obtained in the fourth step by using a vacuum rake dryer, and stirring once to dehydrate the liquid until the liquid becomes paste;
step six: and cooling the paste obtained in the fifth step to room temperature to obtain the milky-white accelerating agent solid master batch.
6. The method for preparing a solid master batch of a fluorine-free alkali-free liquid accelerator as claimed in claim 5, wherein: in the fourth step, the drying temperature of the vacuum rake dryer is 80-90 ℃, the pressure of the dryer is 0.1 times of atmospheric pressure, and the drying time is 3-5 h.
7. A method for using a solid master batch of a fluorine-free alkali-free liquid accelerator, which is the solid master batch of the fluorine-free alkali-free liquid accelerator according to any one of claims 1 to 5, wherein: and mixing and stirring the solid master batch of the fluorine-free alkali-free liquid accelerator and water at a preset ratio for 10-20 min at normal temperature to completely dissolve the solid master batch and the water to form the alkali-free liquid accelerator.
8. The method for using the fluorine-free alkali-free liquid accelerator solid master batch according to claim 6, wherein the fluorine-free alkali-free liquid accelerator solid master batch comprises the following steps: the preset proportion is specifically as follows: the solid master batch is 50-60% by mass, and the water is 40-50% by mass.
9. The method for using the fluorine-free alkali-free liquid accelerator solid master batch according to claim 6, wherein the fluorine-free alkali-free liquid accelerator solid master batch comprises the following steps: the alkali-free liquid accelerator is used in the wet-spraying concrete construction process, and the mixing amount of the alkali-free liquid accelerator is 6-8% of the mass of the glue material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110869559.8A CN113548825A (en) | 2021-07-30 | 2021-07-30 | Solid master batch of fluoride-free alkali-free liquid accelerator and preparation and use methods thereof |
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| CN202110869559.8A CN113548825A (en) | 2021-07-30 | 2021-07-30 | Solid master batch of fluoride-free alkali-free liquid accelerator and preparation and use methods thereof |
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Cited By (3)
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| CN115403294A (en) * | 2022-09-01 | 2022-11-29 | 中国科学院兰州化学物理研究所 | High-stability alkali-free chlorine-free fluorine-free liquid accelerator and preparation method thereof |
| CN115636615A (en) * | 2022-11-04 | 2023-01-24 | 中南大学 | Alkali-free chlorine-free fluorine-free early strength type liquid accelerator and preparation method thereof |
| CN116693229A (en) * | 2023-05-30 | 2023-09-05 | 中铁四局集团有限公司 | Preparation method of alkali-free fluorine-free liquid accelerator |
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| CN111939853A (en) * | 2020-07-06 | 2020-11-17 | 江苏奥莱特新材料股份有限公司 | Production device and method of solid alkali-free setting accelerator |
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| CN115403294A (en) * | 2022-09-01 | 2022-11-29 | 中国科学院兰州化学物理研究所 | High-stability alkali-free chlorine-free fluorine-free liquid accelerator and preparation method thereof |
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| CN116693229A (en) * | 2023-05-30 | 2023-09-05 | 中铁四局集团有限公司 | Preparation method of alkali-free fluorine-free liquid accelerator |
| CN116693229B (en) * | 2023-05-30 | 2024-05-14 | 中铁四局集团有限公司 | Preparation method of alkali-free fluorine-free liquid accelerator |
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