CN111517689A - High-efficiency fly ash activator and preparation method thereof - Google Patents
High-efficiency fly ash activator and preparation method thereof Download PDFInfo
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- CN111517689A CN111517689A CN202010381796.5A CN202010381796A CN111517689A CN 111517689 A CN111517689 A CN 111517689A CN 202010381796 A CN202010381796 A CN 202010381796A CN 111517689 A CN111517689 A CN 111517689A
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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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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
An efficient fly ash activator and a preparation method thereof, belonging to the technical field of building materials. The preparation method of the high-efficiency powdered coal activator comprises the following steps: (1) adding a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine and cellulose ether according to respective mass fraction proportion, reacting under a preset condition, and simultaneously starting stirring to prepare a mixture; (2) respectively grinding the desulfurized gypsum and the calcium oxide to enable the grinding particle size to reach the standard; (3) adding the ground desulfurized gypsum, calcium oxide and powdery instant silicic acid into water according to respective mass fractions, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to prepare the activating agent. The invention can consume a large amount of solid waste, so that the reaction of the chemical gypsum and the fly ash can reduce the later-stage shrinkage of concrete, and the powdery instant sodium silicate can solve the problem of low early strength of the fly ash concrete.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a high-efficiency fly ash activating agent and a preparation method thereof.
Background
With the global rise of the construction industry, a great deal of research on construction materials has been generated. At the same time, industrial solid waste is also increasing in quantity. As the amount of industrial solid waste accumulated is increased and the amount of non-renewable resources for construction is decreased, the demand for application of industrial solid waste to construction materials is also increased.
The main sources of industrial solid wastes in daily production and life are as follows: coal gangue produced in coal industry; blast furnace slag, steel slag, red mud and the like produced in the metallurgical industry; fly ash and slag produced by fuel power plants and urban central heating systems; chemical gypsum, carbide slag, caustic sludge, and the like produced in the chemical industry and other industries; waste rock and tailings generated by mining metal ores, and the like.
The resources are increasingly in shortage and the energy is in shortage. The storage amount of non-renewable resources such as coal, petroleum, natural gas and the like in China is limited, and most of the non-renewable resources are exploited as main energy; the land desertification is becoming more and more serious, and the per capita land resources are less and less.
There is an ever increasing demand for building materials. The industrialization and urbanization process of China is accelerated continuously, large-scale infrastructure needs a large amount of building materials, particularly wall materials, and about hundred million standard bricks are needed every year.
Advantageous conditions of application of industrial solid wastes to building materials industrial solid materials are widely applied to the field of building materials, and have the following characteristics: the method has the advantages that the method has a large variety, large yield and wide distribution, is uniformly discharged all year round, and can be used as a stable available resource; and secondly, the phase composition is relatively stable, the chemical components are similar to those of the building material raw materials, and the building material has potential activity and is suitable for being used as the raw materials of the building material. In a word, through scientific identification, most industrial solid wastes have the potential of producing building materials, and the industrial solid wastes can save the cost, create higher economic benefit, change waste into valuables and realize the recycling of limited resources as raw materials of the building materials.
At present, in the prior art, the fly ash in the industrial solid waste is usually added into the concrete to replace the cement, but the defect is that the early strength growth speed of the concrete is too low. The mixing amount is particularly remarkable when the mixing amount is high, and the concentration of a pore solution and ions in a fly ash-CaO-water system is low, so that the early hydration of the fly ash is very slow.
Disclosure of Invention
In order to solve the technical problem that the early strength increasing speed of concrete is too low in partial cement clinker replacement, the invention provides a fly ash-CaO-alkali solution system which is used for obviously improving the early hydration degree of fly ash, and the fly ash concrete prepared by adding an activating agent into the cement is used for reducing the using amount of the cement, relieving the problem of non-renewable resources, enhancing the compression resistance of the concrete and obviously improving the mechanical property of the concrete.
The invention provides a high-efficiency powdered coal activator which is a mixture consisting of desulfurized gypsum, calcium oxide, powdery instant sodium silicate, a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine, cellulose ether and water.
Further, the high-efficiency pulverized coal activator according to claim 1, wherein the mass fraction ratio of the desulfurized gypsum, the calcium oxide, the powdery instant sodium silicate, the high-efficiency water reducing agent, the sodium fluosilicate, the triethanolamine, the cellulose ether and the water is as follows: 25% -40%: 15% -25%: 10% -20%: 7% -15%: 5% -10%: 0.02% -0.05%: 0.1% -0.3%: 15 to 30 percent.
Further, the high-efficiency water reducing agent can be a naphthalene high-efficiency water reducing agent, a sulfamate high-efficiency water reducing agent and a polycarboxylate high-efficiency water reducing agent.
Further, the cellulose ether is composed of hydroxyethyl cellulose, carboxymethyl hydroxyethyl cellulose, ethyl cellulose and carboxymethyl cellulose.
Further, the mass fraction ratio of the hydroxyethyl cellulose, the carboxymethyl hydroxyethyl cellulose, the ethyl cellulose and the carboxymethyl cellulose is as follows: 1-2: 0.5-1: 0.1-0.5: 1-2.
A preparation method of a high-efficiency powdered coal activator comprises the following steps:
(1) adding a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine and cellulose ether according to respective mass fraction proportion, reacting under a preset condition, and simultaneously starting stirring to prepare a mixture;
(2) respectively grinding the desulfurized gypsum and the calcium oxide to enable the grinding particle size to reach the standard;
(3) adding the ground desulfurized gypsum, calcium oxide and powdery instant silicic acid into water according to respective mass fractions, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to prepare the activating agent.
Further, in the step (1), the preset conditions are that the preset pressure value is 4MPa, the preset temperature is 50 ℃, and the stirring time is two hours.
Further, the standard in the step (2) is specifically that the grinding particle size is less than 7 mm.
Has the advantages that: the high-efficiency pulverized coal activator provided by the invention can be activated with fly ash in a large-dosage cementing material to replace 50-60% of cement, and simultaneously, the fly ash concrete prepared by doping 7.5% of activator into 50% of fly ash in the cement is used to replace the cement, the cement material of each concrete is reduced by at least 50%, so that the use of the cement can be greatly reduced, and the sulfate erosion resistance and the chloride ion erosion resistance of the concrete can be greatly improved. After a proper amount of the high-efficiency powdered coal activator provided by the invention is mixed into the powdered coal ash, the components in the chemical gypsum and the powdered coal ash can be combined to form hydrated calcium sulphoaluminate, thereby the concrete expands in the early stage, the later contraction can be reduced, the volume stability of the concrete is increased, the lower neutral ion concentration of the pore solution in the fly ash-CaO-alkali solution system is obviously increased, the early hydration degree of the fly ash is obviously improved, a large amount of solid waste can be consumed, the chemical gypsum and the fly ash can react to reduce the later shrinkage of concrete, the powdered instant sodium silicate can solve the problem of low early strength of the fly ash concrete, and the addition of the high-efficiency powdered coal activator provided by the invention can further improve the stability of the concrete under the conditions of good workability and pumpability.
Detailed Description
The invention provides a high-efficiency pulverized coal activator which is a mixture consisting of desulfurized gypsum, calcium oxide, powdery instant sodium silicate, a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine, cellulose ether and water, wherein the sodium fluosilicate can solve the problem that the concrete solidification early strength is too slow after a large amount of fly ash is doped, and the problem that the concrete solidification early strength is low after the fly ash is doped into cement is solved. In addition, the powdery instant sodium silicate is strong alkali weak acid salt, after rapid hydrolysis, the solution can contain higher concentration of hydroxide ions and weak acid ions, so that partial Si-O, Al-O bonds in the original glassy network with higher polymerization degree are broken to form unsaturated active bonds to accelerate the reaction with calcium hydroxide, and hydrates with better gelling properties, such as calcium silicate hydrate, calcium aluminate hydrate, ettringite and the like, are generated, thereby being beneficial to the gelling and pressure resistance of concrete.
As a further improvement of the invention, the mass fraction ratio of the desulfurized gypsum, the calcium oxide, the powdery instant sodium silicate, the high-efficiency water reducing agent, the sodium fluosilicate, the triethanolamine, the cellulose ether and the water is as follows: 25% -40%: 15% -25%: 10% -20%: 7% -15%: 5% -10%: 0.02% -0.05%: 0.1% -0.3%: 15 to 30 percent.
As a further improvement of the invention, the high-efficiency water reducing agent can be specifically a naphthalene-based high-efficiency water reducing agent, a sulfamate-based high-efficiency water reducing agent and a polycarboxylate-based high-efficiency water reducing agent, the high-efficiency water reducing agent increases the fluidity of concrete, and after the fly ash is added to the concrete, the high-efficiency water reducing agent can reduce the using amount of water and enhance the strength of the concrete without increasing the using amount of cement.
As a further improvement of the invention, the cellulose ether is composed of hydroxyethyl cellulose, carboxymethyl hydroxyethyl cellulose, ethyl cellulose and carboxymethyl cellulose.
As a further improvement of the invention, the mass fraction ratio of the hydroxyethyl cellulose, the carboxymethyl hydroxyethyl cellulose, the ethyl cellulose and the carboxymethyl cellulose is as follows: 1-2: 0.5-1: 0.1-0.5: 1-2.
A preparation method of a high-efficiency powdered coal activator comprises the following steps:
(1) adding a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine and cellulose ether according to respective mass fraction proportion, reacting under a preset condition, and simultaneously starting stirring to prepare a mixture;
(2) respectively grinding the desulfurized gypsum and the calcium oxide to enable the grinding particle size to reach the standard;
(3) adding the ground desulfurized gypsum, calcium oxide and powdery instant silicic acid into water according to respective mass fractions, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to prepare the activating agent.
As a further improvement of the invention, in the step (1), the preset conditions are that the preset pressure value is 4MPa, the preset temperature is 50 ℃, and the stirring time is two hours.
As a further improvement of the invention, the standard in the step (2) is specifically that the grain size of the ground powder is less than 7 mm.
The following are specific examples.
The first embodiment is as follows:
(1) adding 7% of high-efficiency water reducing agent, 5% of sodium fluosilicate, 0.03% of triethanolamine and 0.2% of cellulose ether into a reaction kettle, setting the pressure to be 4MPa and the temperature to be 50 ℃ for reaction, simultaneously starting a stirring device for stirring, and continuing for two hours to prepare a mixture;
(2) respectively grinding 30% of desulfurized gypsum and 20% of calcium oxide to the particle size of below 7 mm;
(3) adding the ground desulfurized gypsum, calcium oxide and 15% of powdery instant silicic acid into 22.77% of water, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to obtain the activating agent.
Example two:
(1) adding 15% of high-efficiency water reducing agent, 10% of sodium fluosilicate, 0.05% of triethanolamine and 0.3% of cellulose ether into a reaction kettle, setting the pressure to be 4MPa and the temperature to be 50 ℃ for reaction, simultaneously starting a stirring device for stirring, and continuing for two hours to prepare a mixture;
(2) respectively grinding 40% of desulfurized gypsum and 25% of calcium oxide to the particle size of below 7 mm;
(3) adding the ground desulfurized gypsum, calcium oxide and 20% of powdery instant silicic acid into 30% of water, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to obtain the activating agent.
Example three:
(1) adding 10% of high-efficiency water reducing agent, 8% of sodium fluosilicate, 0.02% of triethanolamine and 0.1% of cellulose ether into a reaction kettle, setting the pressure to be 4MPa and the temperature to be 50 ℃ for reaction, simultaneously starting a stirring device for stirring, and continuing for two hours to prepare a mixture;
(2) respectively grinding 25% of desulfurized gypsum and 15% of calcium oxide to the particle size of below 7 mm;
(3) adding the ground desulfurized gypsum, calcium oxide and 10% of powdery instant silicic acid into 15% of water, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to obtain the activating agent.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A high-efficiency powdered coal activator is characterized in that: the high-efficiency powdered coal activator is a mixture consisting of desulfurized gypsum, calcium oxide, powdery instant sodium silicate, a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine, cellulose ether and water.
2. The high-efficiency pulverized coal activator according to claim 1, wherein the mass fraction ratio of the desulfurized gypsum, the calcium oxide, the powdery instant sodium silicate, the high-efficiency water reducing agent, the sodium fluosilicate, the triethanolamine, the cellulose ether and the water is as follows: 25% -40%: 15% -25%: 10% -20%: 7% -15%: 5% -10%: 0.02% -0.05%: 0.1% -0.3%: 15 to 30 percent.
3. The high-efficiency pulverized coal activator according to claim 2, wherein the high-efficiency water reducing agent is selected from the group consisting of naphthalene-based high-efficiency water reducing agents, sulfamate-based high-efficiency water reducing agents, and polycarboxylate-based high-efficiency water reducing agents.
4. The high efficiency pulverized coal activator according to claim 3, wherein the cellulose ether is composed of hydroxyethyl cellulose, carboxymethyl hydroxyethyl cellulose, ethyl cellulose, and carboxymethyl cellulose.
5. The high-efficiency pulverized coal activator according to claim 4, wherein the mass fraction ratio of the hydroxyethyl cellulose, the carboxymethyl hydroxyethyl cellulose, the ethyl cellulose and the carboxymethyl cellulose is as follows: 1-2: 0.5-1: 0.1-0.5: 1-2.
6. The method for preparing the high-efficiency powdered coal activator according to claim 6, which comprises the following steps:
(1) adding a high-efficiency water reducing agent, sodium fluosilicate, triethanolamine and cellulose ether according to respective mass fraction proportion, reacting under a preset condition, and simultaneously starting stirring to prepare a mixture;
(2) respectively grinding the desulfurized gypsum and the calcium oxide to enable the grinding particle size to reach the standard;
(3) adding the ground desulfurized gypsum, calcium oxide and powdery instant silicic acid into water according to respective mass fractions, adding the mixture prepared in the step (1), mixing and stirring for 30 minutes to prepare the activating agent.
7. The preparation method of the high-efficiency pulverized coal activator according to claim 6, wherein the preset conditions in the step (1) are that the preset pressure value is 4MPa, the preset temperature is 50 ℃, and the stirring time is two hours.
8. The preparation method of the high-efficiency pulverized coal activator according to claim 6, wherein the standard in the step (2) is specifically that the grinding grain size is less than 7 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010381796.5A CN111517689A (en) | 2020-05-08 | 2020-05-08 | High-efficiency fly ash activator and preparation method thereof |
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| CN202010381796.5A CN111517689A (en) | 2020-05-08 | 2020-05-08 | High-efficiency fly ash activator and preparation method thereof |
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Cited By (2)
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| CN112266070A (en) * | 2020-09-16 | 2021-01-26 | 中国神华能源股份有限公司国华电力分公司 | Method and device for passivating heavy metals in desulfurization wastewater |
| CN114276088A (en) * | 2022-01-18 | 2022-04-05 | 中国矿业大学 | High-strength building block material with high content of fly ash and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112266070A (en) * | 2020-09-16 | 2021-01-26 | 中国神华能源股份有限公司国华电力分公司 | Method and device for passivating heavy metals in desulfurization wastewater |
| CN114276088A (en) * | 2022-01-18 | 2022-04-05 | 中国矿业大学 | High-strength building block material with high content of fly ash and preparation method thereof |
| CN114276088B (en) * | 2022-01-18 | 2023-03-17 | 中国矿业大学 | High-strength building block material with high content of fly ash and preparation method thereof |
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Application publication date: 20200811 |