Geopolymer and preparation method and application thereof

A technology of geopolymers and mixtures, applied in cement production and other directions, can solve the problem of difficult resource utilization of shield slag with high mud content, and achieve the effects of avoiding carbon emissions, reducing porosity, and improving durability.

Active Publication Date: 2018-05-18
CHINA CONSTR FIFTH ENG DIV CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a geopolymer and its preparation method and application, in order to solve the technical problem that the shield dregs with high mud content are difficult to be utilized as resources

Method used

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  • Geopolymer and preparation method and application thereof
  • Geopolymer and preparation method and application thereof
  • Geopolymer and preparation method and application thereof

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preparation example Construction

[0061] As a general inventive concept, the present invention also provides the preparation method of above-mentioned geological polymer, comprises the following steps:

[0062] (1) drying and pulverizing the shield machine dregs to obtain processed shield machine dregs; mixing the processed shield machine dregs with fly ash in proportion to obtain a mixture;

[0063] (2) Add the basic activator to the mixture in step (1) by spraying, and stir to obtain the mixed wet material;

[0064] (3) Put the mixed wet material obtained in the step (2) into a mold and press it tightly, and release the mold after standing to obtain the geopolymer.

[0065] In the above step (1), after mixing the shield dreg obtained by drying and pulverizing with the fly ash in proportion, dry mixing for 5 minutes, and mixing evenly to obtain a mixture.

[0066] The above-mentioned preparation method of the geopolymer utilizes the high mud content shield dregs as resources, not only digests the shield dreg...

Embodiment 1

[0079] The geopolymer is prepared from the following raw materials: dried, pulverized and screened shield dregs and fly ash with a particle size of less than 2mm and a moisture content of less than 3% in a mass ratio of 3:1 Mix to form a mixture, the mass ratio of the basic activator and the mixture is 0.14: 1, wherein the basic activator is a mixed solution of water glass and NaOH solution, the mass ratio of water glass solution and NaOH solution is 1.8: 1, the concentration of NaOH 8mol / L, water glass modulus 3.0. The shield muck mentioned above is shield muck with high mud content, and its main component is clay.

[0080] The preparation method of above-mentioned geopolymer is as follows:

[0081] (1) Dry the high mud content shield dregs, then pulverize them, and pass through a 2mm sieve to obtain shield dregs with a particle size less than 2mm, i.e. fine-grained soil; grind the dry fly ash into fine powder, And pass through a 2mm sieve to obtain fly ash with a particle ...

Embodiment 2

[0084] The geopolymer is prepared from the following raw materials: dried, pulverized and screened shield dregs and fly ash with a particle size of less than 2mm and a moisture content of less than 3% in a mass ratio of 3:1 Mix to form a mixture, the mass ratio of the basic activator to the mixture is 0.16: 1, wherein the basic activator is the mixed solution of water glass and NaOH solution, the mass ratio of water glass solution and NaOH solution is 2: 1, the concentration of NaOH 10mol / L, water glass modulus 3.0. The shield muck mentioned above is shield muck with high mud content, and its main component is clay.

[0085] The method for preparing the geopolymer in this embodiment is the same as that in Embodiment 1.

[0086]The end faces of the above-mentioned geopolymer specimens were ground to be smooth, and the Instron rigidity testing machine was used to carry out uniaxial compression experiments, and the full stress-strain curves were measured. Figure 4 , the peak c...

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Abstract

The invention discloses a geopolymer and a preparation method and application thereof. The geopolymer is at least prepared from fly ash, shield muck and an alkaline activator. The main component of the shield muck is clay, and the mass ratio of the fly ash to the dried shield muck is (1-2):3; the mass ratio of a mixture of the fly ash and the dried shield muck to the alkaline activator is 1:(0.14-0.18). According to the geopolymer, the high-mud-content shield muck is subjected to recycling application, and the preparation raw materials do not include any type of traditional cementing materialssuch as cement and lime, so that large carbon emission is avoided, and the cost is low. The geopolymer is high in strength and good in water resistance. The preparation method of the geopolymer includes the steps that the alkaline activator is added into the mixture of the fly ash and the shield muck through spraying to avoid large aggregates; the mixed wet material is tightly pressed in a mold,so that a geopolymer test piece has relatively high strength and water resistance.

Description

technical field [0001] The invention relates to the technical field of recycling of slag, in particular to a geopolymer. In addition, the invention also relates to a preparation method and application of geopolymer. Background technique [0002] Geopolymer is a new type of green building material, which can be prepared by reacting solid waste and minerals rich in silica and aluminum with alkali solution or alkali metal silicate solution, especially waste or minerals such as metakaolin, fly ash or slag . At present, 75% of my country's electricity is supplied by thermal power plants, and thermal power plants produce a large amount of fly ash. Fly ash has wide sources, low cost, and some properties are better than metakaolin, so the use of fly ash to make geopolymers has broad development prospects. [0003] With the development of urban development and construction, especially the rapid development of subway construction in recent years, a large amount of construction wast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B111/27
CPCC04B28/006C04B2111/00017C04B2111/27C04B2201/50C04B18/08C04B18/16C04B22/08C04B22/062Y02P40/10
Inventor 阳栋谭立新李水生支华龙习智琴
Owner CHINA CONSTR FIFTH ENG DIV CORP LTD
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