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Alkali-activated fly ash cementing material and preparation method thereof

A technology of cementitious materials and fly ash, applied in the field of cementitious materials, can solve the problems of low early activity and low utilization rate, and achieve the effects of low energy consumption, low cost and long operating time

Inactive Publication Date: 2017-02-08
ZHUODA NEW MATERIALS TECH GRP WEIHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide an alkali-activated fly ash cementitious material and its preparation method, so as to overcome the shortcoming of low utilization rate caused by low early activity of fly ash products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An alkali-activated fly ash cementitious material comprises the following components by weight: 70 parts of fly ash, 10 parts of metakaolin, 1 part of cement, 1 part of slag and 50 parts of activator.

[0028] In this embodiment, the particle diameter of fly ash is lower than 75um, contains SiO in the fly ash 2 、Al 2 o3 and Fe 2 o 3 The calcium content is 72%, and the calcium content is less than 10%. It belongs to F-class fly ash, and its ignition loss is less than 10%, which mainly comes from bituminous coal-fired power plants, boiler factories, etc.; It is obtained by dehydrating and removing impurities by calcining for 2 to 3 hours; the cement is ordinary Portland cement with a strength grade of 42.5, 42.5R, 52.5 and 52.5R; the slag is the residue of iron ore after beneficiation or smelting.

[0029] In this embodiment, preferably, the activator is modified sodium silicate; the modified sodium silicate is prepared by putting powdered sodium silicate into sodium h...

Embodiment 2

[0036] An alkali-activated fly ash cementitious material comprises the following components by weight: 100 parts of fly ash, 30 parts of metakaolin, 10 parts of cement, 10 parts of slag and 60 parts of activator.

[0037] In this embodiment, the particle diameter of fly ash is lower than 75um, contains SiO in the fly ash 2 、Al 2 o 3 and Fe 2 o 3 The calcium content is 85%, and the calcium content is less than 10%. It belongs to F-class fly ash, and its ignition loss is less than 10%, which mainly comes from bituminous coal-fired power plants, boiler factories, etc.; Calcined for 2-3 hours to dehydrate and remove impurities; the cement is white Portland cement with a strength grade of 32.5, 42.5 or 52.5; slag is the residue of iron ore after beneficiation or smelting.

[0038] Preferably in this embodiment, the activator is modified sodium silicate; modified sodium silicate is dissolved in liquid sodium silicate by dissolving flake sodium hydroxide, and the dosage of flake ...

Embodiment 3

[0045] An alkali-activated fly ash cementitious material comprises the following components by weight: 85 parts of fly ash, 20 parts of metakaolin, 5 parts of cement, 5 parts of slag and 55 parts of activator.

[0046] In this embodiment, the particle diameter of fly ash is lower than 75um, contains SiO in the fly ash 2 、Al 2 o 3 and Fe 2 o 3 The calcium content is 80%, the calcium content is less than 10%, and it belongs to F-class fly ash, and its ignition loss is less than 10%, which mainly comes from bituminous coal-fired power plants, boiler factories, etc.; Calcined for 2-3 hours to dehydrate and remove impurities; the cement is white Portland cement with a strength grade of 32.5, 42.5 or 52.5; slag is the residue of iron ore after beneficiation or smelting.

[0047] Preferably in this embodiment, the activator is modified sodium silicate; modified sodium silicate is dissolved in liquid sodium silicate by dissolving flake sodium hydroxide, and the dosage of flake sod...

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Abstract

The invention discloses an alkali-activated fly ash cementing material and a preparation method thereof. The cementing material comprises the following components in parts by weight: 70 to 100 parts of fly ash, 10 to 30 parts of meta-kaolin, 1 to 10 parts of cement, 1 to 10 parts of slag, and 50 to 60 parts of activator. The content of doped fly ash in the cementing material is high and can reach 70 to 80%. The problem that the activity of fly ash and the strength of the cementing material are low in the early stage is solved, and thus the cementing material can be used in novel building materials massively.

Description

technical field [0001] The invention relates to the field of cementitious materials, in particular to an alkali-activated fly ash cementitious material and a preparation method thereof. Background technique [0002] Alkali-activated gelling material is a new type of inorganic non-metallic gelling material newly developed in recent years. Its compressive and flexural strength, acid and alkali erosion resistance, freeze-thaw resistance, and carbonization resistance are all better than ordinary silicic acid. properties of salt cement. In addition, the alkali-activated gelling material has a simple preparation process, no firing, low energy consumption, low cost, and wide market. It is a gelling material with the most development potential in the 21st century. Many industrial solid wastes such as: steel slag, slag, fly ash and coal gangue, etc., the main mineral components are silicates or aluminosilicates, so these industrial solid wastes can be used as a base for the preparat...

Claims

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Application Information

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IPC IPC(8): C04B28/26
CPCC04B28/26C04B2201/50C04B18/08C04B14/106C04B7/02C04B18/141C04B22/062C04B18/12
Inventor 杨卓舒邝清林史红彬
Owner ZHUODA NEW MATERIALS TECH GRP WEIHAI CO LTD
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