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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

Inactive Publication Date: 2017-02-22
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
  • Alkali-activated cementing material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0039] The method for preparing an alkali-activated gelling material provided by an embodiment of the present invention includes the following steps:

[0040] (1) Weigh the raw materials: the raw materials include powder, an aqueous solution of a liquid activator, and aluminum-containing additives, wherein the powder is calcined bauxite tailings and slag powder in a mass ratio of 7-8 :3-2 is mixed, the aqueous solution of the liquid stimulant is Na 2 O mass is calculated as 4-5% of the mass of the powder, according to Na 2 Calculate the mass of O and weigh the mass of aluminum-containing additives. 2 O and Al 2 O 3 The molar ratio is 0.9-1.3:1;

[0041] (2) Mixing the powder and aluminum-containing additives to obtain a solid raw material, and mixing the solid raw material and an aqueous solution of a liquid activator to obtain the alkali-activated gelling material;

[0042] The mass ratio of water in the raw material to the solid raw material is 0.4-0.5.

[0043] The above scheme has...

Embodiment 1

[0051] Table 4 shows the alkali dissolution amount and strength of the sample after mixing with aluminum-rich metakaolin. The cementing material ratio is 70% tailings + 30% slag powder + 5% water glass (with Na 2 O, accounting for the mass percentage of tailings and slag powder; modulus is 2.2)

[0052] Table 4

[0053]

[0054] It can be seen from the results that the addition of metakaolin brings more aluminum, which gradually reduces the Si / Al ratio and Na / Al ratio of the sample, and even makes the Na / Al ratio close to 1. Assuming that the aluminum in metakaolin can be released under the condition of alkali excitation, and all enter the silicon-aluminum polymer structure, then the excess negative charge in the structure will be bonded to Na + To achieve equilibrium, the amount of alkali dissolution is reduced accordingly. However, the fact is quite the opposite. The amount of alkali dissolution of the sample after the addition of metakaolin increases, and the strength gradually...

Embodiment 2

[0061] According to the results of Example 1, it can be seen that whether aluminum is released quickly is one of the keys to whether the blended components can inhibit the alkali dissolution. Therefore, soluble aluminate can be used at room temperature to achieve the purpose of rapid release of aluminum. Since calcium is required for gel formation, calcium aluminate can be used. Among several kinds of calcium aluminate, monocalcium aluminate has hydration activity and is the main component of aluminate cement. Therefore, aluminate cement can be used as a modified component at room temperature.

[0062] Table 6 shows the inhibitory effect of adding a small amount of aluminate cement to the alkali dissolution of cementitious materials. The cementing material ratio is 70% tailings + 30% slag powder + 5% water glass (with Na 2 O, accounting for the mass percentage of tailings and slag powder; modulus is 2.2)

[0063] Table 6

[0064]

[0065] It can be seen from the results that the ...

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Abstract

The invention discloses an alkali-activated cementing material and a preparation method thereof, and belongs to the field of buildings. The method comprises the following steps: (1), weighing raw materials, wherein the raw materials include powder, water solution of a liquid activator and an aluminum-containing addition agent, the powder is formed by roasted bauxite separation tailing and slag powder which are mixed according to the mass ratio of (7 to 8):(3 to 2), the mass of the water solution of the liquid activator is 4 to 5% that of powder according to the mass of Na2O, the mass of the aluminum-containing addition agent is calculated according to the mass of the Na2O, the aluminum-contained addition agent is weighed, and a molar ratio between the Na2O and Al2O3 is (0.9 to 1.3):1; (2), evenly mixing the powder and the aluminum-containing addition agent to obtain a solid raw material, and evenly mixing the solid raw material with the water solution of the liquid activator to obtain the alkali-activated cementing material, wherein a mass ratio between water in the raw materials and the solid raw materials is 0.4 to 0.5. The method has the advantage of being low in alkali dissolution quantity.

Description

Technical field [0001] The invention relates to the field of construction, in particular to an alkali-activated gelling material and a preparation method thereof. Background technique [0002] Alkali-activated cementitious material is a new type of cementitious material that takes silicon-aluminum waste as the main raw material and has hydraulic properties under the action of alkali. This material is considered to be a low-carbon cementitious material due to its low energy consumption and low emissions during the preparation process, and can provide similar properties to cement-based cementitious materials, and has become a research hotspot in recent years. [0003] Although alkali-activated cementitious materials have many performance advantages such as rapid strength development and excellent chemical resistance, they must use alkali metal salts such as sodium silicate as the activator, and such as Na + , K + Iso-alkali metal ions have a small radius and are not the formation of ...

Claims

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Application Information

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