Method for homogeneously modifying pulverized coal ash by vapor deposition process

A vapor deposition method and homogeneous modification technology, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of poorly improved concrete work performance, decreased concrete durability, and fly ash Problems such as the weakening of the ball effect, to avoid the increase in water demand, improve efficiency, and avoid the effect of early strength reduction

Inactive Publication Date: 2015-12-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the increase of the specific surface area of ​​fly ash, the amount of water adsorbed by fly ash increases, which increases the water demand of fly ash. The simultaneous action of these factors will lead to the fact that when the fly ash is mixed into the concrete, the working performance of the concrete cannot be improved very well.
The modification of alkaline substances can stimulate the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example 1:

[0018] Take the preparation of 100 kg of functionalized homogeneous modified fly ash as an example. Weigh the raw materials: 100kg of fly ash, 0.02kg of compound grinding aid triisopropanolamine, 0.01kg of compound grinding aid of molasses, dissolve the two grinding aids in 0.07kg of water, and naturally deposit in the powder after atomization The surface of coal ash is ground with a ball mill for 15 minutes to a specific surface area of ​​550~700m 2 / kg. Weigh 0.75kg of high-efficiency dispersing component and 0.25kg of reinforcing component, uniformly dissolve them in 1kg of water, put them in an atomizing sprayer, and deposit on the ground coal ash after atomization, and then weigh the retarder Add 0.2kg of the slump-preserving component to the surface-modified fly ash, and mix it evenly with a mixer.

[0019] The high-efficiency dispersing component is a powdered polycarboxylic acid superplasticizer; the reinforcing component is a chemically pure reagent o...

Example Embodiment

[0021] Example 2:

[0022] Take the preparation of 100 kg of functionalized homogeneous modified fly ash as an example. Weigh the raw materials: 100kg of fly ash, 0.02kg of compound grinding aid triisopropanolamine, 0.01kg of compound grinding aid of molasses, dissolve the two grinding aids in 0.07kg of water, and naturally deposit in the powder after atomization The surface of coal ash is ground with a ball mill for 15 minutes to a specific surface area of ​​550~700m 2 / kg. Weigh 1kg of high-efficiency dispersing component and 0.5kg of reinforcing component, uniformly dissolve them in 1.5kg of water, put them in an atomizing sprayer, and deposit on the ground coal ash after atomization, and then weigh the retarded Add 0.2kg of the slump-preserving component to the surface-modified fly ash, and mix it evenly with a mixer.

[0023] The high-efficiency dispersing component is a powdered polycarboxylic acid superplasticizer; the reinforcing component is a chemically pure reagent of ...

Example Embodiment

[0025] Example 3:

[0026] Take the preparation of 100 kg of functionalized homogeneous modified fly ash as an example. Weigh the raw materials: 100kg of fly ash, 0.04kg of compound grinding aid triisopropanolamine, 0.02kg of compound grinding aid of molasses, dissolve the two grinding aids in 0.14kg of water, and deposit them naturally in the powder after atomization. The surface of coal ash is ground with a ball mill for 15 minutes to a specific surface area of ​​550~700m 2 / kg. Weigh 1kg of high-efficiency dispersing component and 0.5kg of reinforcing component, uniformly dissolve them in 1.5kg of water, put them in an atomizing sprayer, and deposit on the ground coal ash after atomization, and then weigh the retarded Add 0.2kg of the slump-preserving component to the surface-modified fly ash, and mix it evenly with a mixer.

[0027] The high-efficiency dispersing component is a powdered polycarboxylic acid superplasticizer; the reinforcing component is a chemically pure reage...

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Abstract

The invention relates to a method for homogeneously modifying pulverized coal ash by a vapor deposition process. The method comprises the following steps of (1) atomizing a composite grinding aid, then, naturally depositing the atomized composite grinding aid on the surface of the pulverized coal ash, carrying out uniformly mixing, and then, carrying out grinding; (2) naturally depositing an atomized surface modifier on the surface of the ground pulverized coal ash; and (3) mixing a slow-setting slump-resisting component with the pulverized coal ash, thereby obtaining the modified pulverized coal ash. The method has the advantages that (1) the grinding efficiency for the pulverized coal ash is increased; (2) with an efficient dispersion component of the surface modifier, the problem that the volume of water required by the pulverized coal ash is increased due to mechanical activation is avoided, and the workability of concrete is improved; (3) with a reinforcing component of the surface modifier, the early strength of the pulverized coal ash is enhanced; (4) the stability for the properties of the pulverized coal ash is guaranteed; and (5) industrial solid waste, i.e., ardealite, serves as the slow-setting slump-resisting component and is added into the pulverized coal ash, so that the gradual loss of the concrete can be greatly reduced.

Description

technical field [0001] The invention relates to a homogeneously modified fly ash by a vapor deposition method. The modified fly ash can be applied to commercial concrete and belongs to the field of building materials. Background technique [0002] Fly ash is a kind of industrial waste discharged from thermal power plants, and its discharge is large and widely distributed. At present, the use of fly ash as a concrete admixture has become one of the main ways of fly ash treatment. Domestically, the use of fly ash focuses on the direct application of large amounts of fly ash to concrete, but the direct use of large amounts of fly ash cannot give full play to the potential hydration activity of fly ash, resulting in a low utilization rate of fly ash. The added value is small, and if the fly ash is mixed too much or used improperly, it will also cause other disadvantages in the concrete. The existing fly ash activation modification technologies are mainly divided into mechanica...

Claims

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Application Information

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IPC IPC(8): C04B18/08C04B20/02
CPCY02W30/91
Inventor 马保国张昺榴陈方颉谭洪波
Owner WUHAN UNIV OF TECH
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