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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 affecting the appearance of materials, adverse effects on construction, difficulties in surface plastering, etc., and achieve the effect of reducing frosting and ensuring strength

Active Publication Date: 2017-05-31
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Effective alkali" not only affects the appearance of the material, but also has adverse effects on the construction, such as difficulty in plastering the surface

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

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preparation example Construction

[0024] An embodiment of the present invention provides a method for preparing an alkali-activated gelling material, comprising the following steps:

[0025] (1) Weighing raw materials: the raw materials include powders, aqueous solutions of liquid activators and calcium-containing zeolites, wherein the powders are calcined bauxite dressing tailings and slag powder according to the mass ratio of 7-8 : 3-2 mixed, the aqueous solution of the liquid activator is Na 2 The mass of O is 4-5% of the mass of the powder, and the calcium-containing zeolite is 1-5% of the mass of the powder;

[0026] (2) mixing the raw materials to obtain the alkali-activated gelling material;

[0027] The mass ratio of water to solid raw materials in the raw materials is 0.4-0.5.

[0028] The above scheme can already complete the preparation of the alkali-activated gelling material. On this basis, the optimal scheme is given below, which has achieved the purpose of better and effectively inhibiting its...

Embodiment 1

[0040] Table 1 shows the effect of synthetic zeolite (molecular sieve) and natural stilbite (a kind of sodium zeolite) on the alkali dissolution of alkali-activated gelling materials. In the cementitious material, the powder is composed of 80% tailings+20% slag powder, and the quality of water glass is 5% of the powder quality (in terms of Na 2 In terms of O, it accounts for the mass percentage of tailings and slag powder; the modulus is 2.2). The zeolite is mixed into the powder body composed of 80% tailings and 20% slag powder, and the dosage is 1%, 3%, 5%. The curing conditions of the samples are standard curing, that is, 95±5%RH, 20±2°C.

[0041] Table 1

[0042]

[0043] It can be seen from the results that the unmodified zeolite is rich in sodium ions, so its ability to exchange bases to excite sodium ions in the gelling material solution is limited. According to the existing research results, the ion exchange capacity of zeolite can only be released effectively in...

Embodiment 2

[0047] According to the results of Example 1, in order to use the ion exchange capacity of zeolite to achieve the purpose of bonding alkali to excite the alkali metal ions in the gelling material, the zeolite must be modified into a calcium type.

[0048] The modification method of zeolite is in 25% NH 4 In the boiling solution of Cl, it is modified into ammonium type zeolite, and the zeolite is modified at 2mol / LCaCl 2 Carry out ammonium-calcium exchange in hot solution (90° C.), and finally obtain calcium-type zeolite, which is dried for later use.

[0049] Table 2 shows the effect of calcified zeolite on alkali dissolution inhibition of alkali-activated gelling materials. The cementitious material proportioning is that the powder in the cementitious material is made up of 70% tailings+30% slag powder, and the quality of water glass is 4% of the powder mass (in the form of Na 2 In terms of O, it accounts for the mass percentage of tailings and slag powder; the modulus is 2...

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Abstract

The invention discloses an alkali-activated cementing material and a preparation method thereof, belonging to the building field. The preparation method comprises the following steps: (1) weighing raw materials, wherein the raw materials include powder, an aqueous solution of a liquid activator and calcium-containing zeolite, the powder is prepared by mixing calcined bauxite tailings and slag powder in a mass ratio of (7-8):(3-2), the mass of the aqueous solution of the liquid activator is 4-5% of the mass of the powder based on the mass of Na2O, and the mass of the calcium-containing zeolite is 1-5% of the mass of the powder; and (2) mixing the raw materials to obtain the alkali-activated cementing material, wherein the mass ratio of the water to solid raw materials in the raw materials is 0.4-0.5. In the invention, the cementing material prepared by the method has the advantage of low alkali dissolution.

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 gelling materials use silicon-aluminum waste as the main raw material and do not need to go through the process of "two grindings and one burning" because it is considered a low-carbon gelling material. In view of the cement industry greenhouse gas (mainly refers to CO 2 ) emissions have a great impact on the environmental load, this low-carbon cementitious material has become a current research hotspot. [0003] Although this kind of cementitious material has obvious low-carbon characteristics, and it has many excellent properties such as rapid hardening and early strength, it has not been widely used. [0004] "Ubiquinolin" is an important factor hindering its application. Alkali-activated gelling material "efflorescence" means that the alkali metal inside the mat...

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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