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High-quality coal ash for concrete additive and preparation method thereof

A technology of fly ash and additives, which is applied in the field of high-quality fly ash of concrete additives and its preparation, can solve the problems of negative impact on the development of concrete strength, reduction of concrete frost resistance, insufficient concrete strength, etc., to shorten the curing time, Effect of improving frost resistance, good fluidity and filling performance

Inactive Publication Date: 2019-02-05
浙江花园新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although fly ash can be used as a concrete additive, it will have a negative impact on the strength development of concrete, resulting in insufficient early strength of concrete, requiring prolonged curing time. On the other hand, it will also reduce the frost resistance of concrete. Therefore, in order to improve Frost resistance often requires the synergistic use of fly ash and air-entraining agent, resulting in increased cost

Method used

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  • High-quality coal ash for concrete additive and preparation method thereof
  • High-quality coal ash for concrete additive and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing high-quality fly ash for concrete additives, comprising the following steps:

[0023] (1) Take the fly ash, remove the impurities in the fly ash, soak the removed fly ash in distilled water for 2 days, and then filter;

[0024] (2) Bake the fly ash processed in step (1) at 100°C for 1 hour in an oven;

[0025] (3) Mix expanded graphite with 2.5 times its weight in deionized water, use ultrasonic treatment for 30 minutes, then add 0.02% potassium trimethylsiliconate by mass to the expanded graphite dispersion, continue ultrasonic treatment for 1-2 hours, statically Place and treat for 1 hour, then perform suction filtration, wash, and dry to constant weight to obtain modified expanded graphite;

[0026] (4) Mix and stir the fly ash prepared in step (2) with dimethyl sulfoxide and distilled water in a mass ratio of 10:1:2, and then add the step of adding 4% of the weight of fly ash (3 ) in modified expanded graphite, ultrasonically treated for 30-...

Embodiment 2

[0034] A method for preparing high-quality fly ash for concrete additives, comprising the following steps:

[0035] (1) Take the fly ash, remove the impurities in the fly ash, soak the removed fly ash in distilled water for 3 days, and then filter;

[0036] (2) Bake the fly ash processed in step (1) at 100°C for 1 hour in an oven;

[0037] (3) Mix expanded graphite with 2-3 times its weight in deionized water, use ultrasonic treatment for 30 minutes, then add 0.02% potassium trimethylsiliconate by mass to the expanded graphite dispersion, continue ultrasonic treatment for 2 hours, statically Place and treat for 1 hour, then perform suction filtration, wash, and dry to constant weight to obtain modified expanded graphite;

[0038] (4), mix and stir the fly ash prepared in step (2) with dimethyl sulfoxide and distilled water in a mass ratio of 10:1:2, and then add the step of 4.5% of the weight of fly ash (3 ) in modified expanded graphite, ultrasonically treated for 30-40min,...

Embodiment 3

[0046] Compared with Example 1, the fly ash does not undergo the modification treatment in this application after baking.

[0047] In order to verify the effect of the addition of fly ash on the performance of concrete in this application, the following control experiments are set up in this application to verify the effect of fly ash treatment in this application.

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Abstract

The invention relates to high-quality coal ash of a concrete additive for oil stain and a preparation method thereof. The preparation method comprises the following steps: (1) collecting coal ash, removing impurities in the coal ash, cleaning, and filtering; (2) baking the coal ash treated in step (1) for one hour by utilizing a baking oven at 100 to 120 DEG C; (3) preparing modified expanded graphite; and (4) compounding the raw materials. The coal ash in the invention is treated and modified, so that the activity of the coal ash can be improved, the hydration speed of the coal ash can be improved, the strength development speed of the concrete after adding the high-quality coal ash can be increased, the maintenance time of the concrete can be shortened, internal pores of the concrete arefilled, the freezing resistance of the concrete can be improved, and the cost of the concrete can be significantly reduced.

Description

technical field [0001] The invention belongs to the field of environment-friendly building materials, and in particular relates to a high-quality fly ash used as a concrete additive and a preparation method thereof. Background technique [0002] Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. The main oxide composition of fly ash in thermal power plants in my country is: SiO2, Al2O3, FeO, Fe2O3, CaO, TiO2, etc. With the development of the power industry, the discharge of fly ash from coal-fired power plants has increased year by year, becoming one of the largest industrial wastes in my country. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere; if it is discharged into the water system, it will cause river silting, and the toxic chemicals in it will also cause harm to human beings and organisms. However, fly ash can be used as a re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B18/08C04B14/024C04B24/42C04B24/16
Inventor 郭平
Owner 浙江花园新型建材有限公司