Fly ash cementing material

A technology of cementitious materials and fly ash, which is applied in the field of building materials, can solve the problems of limited excitation, unexplained strength, and low strength, and achieve high social and economic benefits, reduce production costs, and improve mechanical strength.

Active Publication Date: 2022-05-10
GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the fly ash itself has a certain activity, its stimulating effect on it in the early stage is limited, resulting in low strength in the early stage
The publication number is CN108706893A Chinese patent discloses a cementitious material made of fly ash, which mentions the early strength characteristics of the cementitious material, but does not specify the strength of one day; and the amount of flyash used in the patent is 10-30% , lower dosage

Method used

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  • Fly ash cementing material

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Experimental program
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Effect test

Embodiment 1

[0022] A fly ash cementitious material, comprising the following raw materials in mass fractions: 50 parts of pulverized coal furnace fly ash, 35 parts of ironmaking blast furnace slag, 5 parts of dihydrate desulfurized gypsum, 10 parts of electric furnace steel slag, 5 parts of chemical activator, 0.1 part of lignosulfonate water reducer, 0.1 part of defoamer. The mass ratio of the chemical activator is as follows: 80% of aluminum sulfate, 5% of calcium aluminate, and 15% of sodium hydroxide.

[0023] The preparation method of the fly ash cementitious material comprises the following steps: (1) each solid waste and a chemical activator are respectively ball-milled to a specific surface area ≥ 400m 2 / kg, weighed in proportion and mixed for 30 minutes until uniform, and transferred the obtained mixture to a mixer; (2) Dissolve lignosulfonate water reducer and defoamer in a certain amount of water and add them to the mixture In the process, stir at a stirring speed of 300r / min...

Embodiment 2

[0025] A fly ash cementitious material, comprising the following raw materials in mass fractions: 60 parts of pulverized coal furnace fly ash, 25 parts of ironmaking blast furnace slag, 10 parts of dihydrate desulfurized gypsum, 5 parts of electric furnace steel slag, 5 parts of chemical activator, 0.5 part of lignosulfonate water reducer, 0.1 part of defoamer. The mass ratio of the chemical activator is as follows: 90% of aluminum sulfate, 5% of calcium aluminate, and 5% of sodium hydroxide.

[0026] The preparation method of the fly ash cementitious material comprises the following steps: (1) each solid waste and a chemical activator are respectively ball-milled to a specific surface area ≥ 400m 2 / kg, weighed in proportion and mixed for 30 minutes until uniform, and transferred the obtained mixture to a mixer; (2) Dissolve lignosulfonate water reducer and defoamer in a certain amount of water and add them to the mixture In the process, stir at a stirring speed of 500r / min ...

Embodiment 3

[0028] A fly ash cementitious material, comprising the following raw materials in mass fractions: 55 parts of pulverized coal furnace fly ash, 30 parts of ironmaking blast furnace slag, 8 parts of dihydrate desulfurized gypsum, 8 parts of electric furnace steel slag, 3 parts of chemical activator, 0.1 part of lignosulfonate water reducer, 0.5 part of defoamer. The mass ratio of the chemical activator is as follows: 90% of aluminum sulfate, 1% of calcium aluminate, and 9% of sodium hydroxide.

[0029] The preparation method of the fly ash cementitious material comprises the following steps: (1) each solid waste and a chemical activator are respectively ball-milled to a specific surface area ≥ 400m 2 / kg, weighed in proportion and mixed for 30 minutes until uniform, and transferred the obtained mixture to the mixer; (2) Dissolve the water reducer and defoamer in a certain amount of water and add them to the mixture, at 300r / kg Stir at a stirring speed of min for 30 min, stir ev...

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Abstract

The invention relates to the field of building materials, in particular to a fly ash cementing material. The fly ash cementing material comprises the following raw materials in parts by mass: 50-60 parts of pulverized coal furnace fly ash, 25-35 parts of slag, 5-10 parts of gypsum, 5-10 parts of steel slag, 1-5 parts of a chemical exciting agent, 0.1-0.5 part of an alkaline water agent and 0.1-0.5 part of a defoaming agent, wherein the chemical exciting agent comprises the following components in percentage by mass: 80-90% of aluminum sulfate, 1-5% of calcium aluminate and 5-15% of sodium hydroxide. According to the fly ash cementing material, the early strength of a product is improved through multiple excitation of alkali excitation, sulfate excitation, calcium aluminate excitation and mechanical excitation, the problems of fly ash treatment and utilization are fully solved, the use amount of fly ash exceeds 50%, waste such as slag and steel slag is subjected to resource utilization, and the cost is reduced. And the method is beneficial to treatment of environmental pollution and has very high social benefits and economic benefits.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a fly ash cementitious material. 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: SiO 2 、Al 2 o 3 , FeO, Fe 2 o 3 , CaO, TiO 2 Wait. 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 resource, such as the preparation of cementitious materials. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B22/14C04B40/00C04B22/06C04B22/08C04B18/14
CPCC04B28/021C04B40/0039C04B40/0028C04B2201/50C04B2201/05C04B22/148C04B22/0093C04B22/062C04B22/145C04B18/141C04B18/142C04B24/18C04B2103/50Y02W30/91Y02P40/10
Inventor 亓熙赵凯何伟发王川行陈慧玲
Owner GUANGDONG TSINGDA TONGKE ENVIRONMENTAL PROTECTION TECH CO LTD
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