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Alkali-activated cementing material and preparation method thereof

A cementitious material, alkali-activated technology, applied in cement production, etc., can solve problems such as blooming

Active Publication Date: 2018-07-06
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, there is a serious "blooming" phenomenon in the alkali-activated gelling materials with common components

Method used

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  • Alkali-activated cementing material and preparation method thereof
  • Alkali-activated cementing material and preparation method thereof

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preparation example Construction

[0032] An embodiment of the present invention proposes a method for preparing an alkali-activated gelling material. The raw materials include powder raw materials, an activator and a nano-component. The activator is a water glass solution and / or a sodium hydroxide solution. The mass ratio of water and powder raw materials in the agent is the preset water-cement ratio; it includes:

[0033] 1) Mix the nano-components with the activator, use mechanical stirring to break up the nano-components, then disperse under ultrasonic conditions for 3-5 minutes, and add water to make up to the preset water-cement ratio to obtain a mixed solution of the activator. Inspire the gelling material to be aged for more than 24 hours in the molding environment;

[0034] Preferably, the nano-component is hydrophilic nano-SiO 2 Or silica fume; wherein the hydrophilic nano-SiO 2 The mass percent of the alkali-activated gelling material is 0.5-3%, and the silica fume accounts for 3-9% of the mass of ...

Embodiment 1

[0057] A kind of preparation method of alkali-activated gelling material that an embodiment of the present invention proposes, raw material comprises powder raw material, activator and nano component, and described activator is water glass solution, and the modulus of water glass solution is 2.0 , the solid content is 46.74%, and the dosage is 20%. The dosage is converted to Na 2 O, it is 6.813%. The mass ratio of water and powder raw materials in the activator is the preset water-cement ratio, which is 0.5; it includes:

[0058] 1) The nanometer component is silica fume, and the median particle size d(0.5) is 200nm. Add 9% silica fume to the activator, fully disperse and boil, cool to room temperature, and let it stand for 24 hours to obtain the activator mixed solution;

[0059] 2) Stir and mix the mixed solution of the powder raw material and the activator, cured for a short time under high temperature and humidity conditions (cured under saturated steam at 40°C for 24 h...

Embodiment 2

[0063] An embodiment of the present invention proposes a method for preparing an alkali-activated gelling material. The raw materials include powder raw materials, an activator and nano components, and the activator is 5% water glass solution and 5.11% sodium hydroxide solution , the converted Na in the activator 2 O is 6.813%. The mass ratio of water and powder raw materials in the activator is the preset water-cement ratio, which is 0.5; it includes:

[0064] 1) The nano-component is nano-SiO 2 , the particle size is less than 40nm. Add 3% nano-SiO to the activator, fully disperse and boil, add water to make up to the preset water-cement ratio, cool to room temperature, and let it stand for 24 hours to obtain the activator mixed solution;

[0065] 2) Stir and mix the mixed solution of the powder raw material and the activator, cured for a short time under high temperature and humidity conditions (cured under saturated steam at 60°C for 48 hours), removed the formwork and ...

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Abstract

The invention relates to an alkali-activated cementing material and a preparation method thereof. Raw materials comprise a powder raw material, an activator and a nano component, wherein the activatoris a water glass solution and / or a sodium hydroxide solution, and the mass ratio of water in the activator to the powder raw material is a preset water-cement ratio. The preparation method of the alkali-activated cementing material comprises the following steps of: (1) mixing the nano component with the activator, adding water until the preset water-cement ratio is achieved so as to obtain an activator mixed solution, and placing the activator mixed solution for aging; (2) optimizing the content of the activator in the activator mixed solution so as to obtain an optimized activator mixed solution; and (3) mixing the powder raw material with the optimized activator mixed solution, performing stirring, and carrying out curing to obtain the alkali-activated cementing material. The amount ofalkali release of the alkali-activated cementing material can be reduced to 3% or below, and a scumming phenomenon of the alkali-activated cementing material can be eliminated completely.

Description

technical field [0001] The invention relates to the field of gelling materials for construction engineering, in particular to an alkali-activated gelling material and a preparation method thereof. Background technique [0002] Alkali-activated gelling material is a new type of gelling material that uses silicon-aluminum waste as the main raw material and is hydraulically hardened under the action of alkali. The material is considered as a low-carbon cementitious material because of its low energy consumption and low emissions during the preparation process, and it can provide similar properties to cement-based cementitious materials, and has become a research hotspot in recent years. [0003] Although alkali-activated gelling materials have many performance advantages such as fast strength development and excellent chemical corrosion resistance, they must use alkali metal salts such as sodium silicate as activators, while Na + 、K + Alkali metal ions have a small radius and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/153
CPCC04B7/1535C04B12/005Y02P40/10
Inventor 叶家元张文生史迪
Owner CHINA BUILDING MATERIALS ACAD
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