Technically simple method for modifying fly ash

A technology with simple process and fly ash, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poor flexural performance and achieve low industrialization cost, process and post-treatment Simple, low reaction temperature effect

Inactive Publication Date: 2015-10-07
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fly ash has the advantages of reducing water consumption, saving cement consumption, improving the workability of concrete mixtures, reducing heat of hydration, thermal expansion, etc., but the effect is not very good in terms of flexural performance

Method used

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  • Technically simple method for modifying fly ash
  • Technically simple method for modifying fly ash
  • Technically simple method for modifying fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Add 100g of fly ash to absolute ethanol, ultrasonically disperse for 30 minutes, then centrifuge, repeat ultrasonically disperse, and centrifuge 3 times; then add distilled water, ultrasonically disperse for 15min, then centrifuge, repeat ultrasonically disperse, centrifuge 3 times, vacuum After drying, the pretreated fly ash is obtained. The purpose of pretreatment is to remove impurities, activate, and disperse the particles of fly ash evenly.

[0024] 2. Slowly pour the pretreated fly ash into a sodium hydroxide solution with a mass concentration of 20%, while continuously stirring and reacting for 24 hours, filter under reduced pressure, wash with distilled water until the pH is 8-9 to obtain alkali-treated fly ash; Pour the alkali-treated fly ash into a sulfuric acid solution with a mass concentration of 10%, continuously stir and react for 4 hours, filter under reduced pressure, wash with distilled water until neutral, and dry in vacuum to obtain hydroxylated f...

Embodiment 2

[0027] 1. Add fly ash to absolute ethanol, ultrasonically disperse for 30 minutes, then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, then add distilled water, ultrasonically disperse for 15 minutes, then centrifuge, repeat ultrasonically disperse, centrifuge 3 times, and vacuum dry Then get the pretreated fly ash. The purpose of pretreatment is to remove impurities, activate and disperse the particles of fly ash evenly.

[0028] 2. Slowly pour the pretreated fly ash into a sodium hydroxide solution with a mass concentration of 20%, while continuously stirring and reacting for 24 hours, filter under reduced pressure, wash with distilled water until the pH is 8-9 to obtain alkali-treated fly ash; Pour the alkali-treated fly ash into a sulfuric acid solution with a mass concentration of 10%, continuously stir and react for 4 hours, filter under reduced pressure, wash with distilled water until neutral, and dry in vacuum to obtain hydroxylated fly ash.

[00...

Embodiment 3

[0031] 1. Add fly ash to absolute ethanol, ultrasonically disperse for 30 minutes, then centrifuge, repeat ultrasonically disperse and centrifuge 3 times, then add distilled water, ultrasonically disperse for 15 minutes, then centrifuge, repeat ultrasonically disperse, centrifuge 3 times, and vacuum dry Then get the pretreated fly ash. The purpose of pretreatment is to remove impurities, activate and disperse the particles of fly ash evenly.

[0032]2. Slowly pour the pretreated fly ash into a sodium hydroxide solution with a mass concentration of 20%, while continuously stirring and reacting for 24 hours, filter under reduced pressure, wash with distilled water until the pH is 8-9 to obtain alkali-treated fly ash; Pour the alkali-treated fly ash into a sulfuric acid solution with a mass concentration of 10%, continuously stir and react for 4 hours, filter under reduced pressure, wash with distilled water until neutral, and dry in vacuum to obtain hydroxylated fly ash.

[003...

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PUM

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Abstract

The invention discloses a technically simple method for modifying fly ash. The method includes hydroxylating the surface of the fly ash to obtain hydroxylated fly ash; grafting the hydroxylated fly ash. The method has the advantages that polyacrylic acid is grafted on the surface of the fly ash, accordingly, the brittleness of cement-based composite materials can be reduced, the toughness of the cement-based composite materials can be improved, water consumption and cement consumption can be decreased, the breaking strength can be evidently improved, and the requirement of the high-performance cement-based composite materials on the breaking strength can be completely met; the modified fly ash contains large quantities of water-soluble groups and accordingly is good in dispersibility, and the problem of agglomeration of mineral admixtures can be effectively solved.

Description

1. Technical field [0001] The invention relates to a method for preparing building materials, in particular to a method for modifying fly ash with a simple process, which is to modify the fly ash by grafting polyacrylic acid. 2. Background technology [0002] Fly ash is the fine ash collected from the flue gas after pulverized coal combustion, and it is an industrial waste discharged from coal-fired power plants. With the advantages of wide range of sources and low production price, the utilization of fly ash in my country has developed vigorously. It has developed from passive stacking and simple treatment to large-scale application in the fields of building materials, construction engineering, municipal administration, transportation, and agricultural environmental protection. Gradually expand to new fields such as light industry, chemical industry, metallurgy, and coal. At present, the research of organic-inorganic composite materials has made great progress, and is widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/08
CPCY02W30/91
Inventor 王文平曹消华赵怀华孙玉
Owner HEFEI UNIV OF TECH
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