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Metakaolin-based geopolymer added with coal ash and preparation method of metakaolin-based geopolymer

A technology of metakaolin and fly ash, which is applied in the field of metakaolin-based geopolymer and its preparation, can solve the problems of land occupation, land waste, environmental pollution, etc., achieve waste reuse, excellent mechanical properties, and improve application rate Effect

Inactive Publication Date: 2018-09-07
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large backlog of fly ash not only causes serious environmental pollution, but also occupies a large amount of land, resulting in a serious waste of land
In addition, the follow-up management of fly ash also requires a lot of expenditure

Method used

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  • Metakaolin-based geopolymer added with coal ash and preparation method of metakaolin-based geopolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A metakaolin-based geopolymer added with fly ash is prepared by the following method:

[0022] (1) Grind fly ash and metakaolin to 200 mesh and sieve to obtain 200 mesh powder; take 960 parts of metakaolin powder and 106.7 parts of brake pad powder respectively, start the mortar mixer and stir the dry mixture for 20-30 minutes until mixed Uniform;

[0023] (2) Water glass and sodium hydroxide solid are mixed and stirred according to 855 parts and 145 parts respectively until the sodium hydroxide solid is completely dissolved to obtain an alkaline activator, which is cooled to room temperature for subsequent use;

[0024] (3) Under stirring conditions, add the basic activator obtained in step (2) to the mixture obtained in step (1), mix and stir for 15min to 30min until it is evenly mixed, inject it into a mold of 40mm×40mm×160mm, and vibrate for 120s , after drying and curing at 30°C for 6 hours, demoulding; after demoulding, the specimen was cured at 30°C and 95% humi...

Embodiment 2

[0027] A metakaolin-based geopolymer added with fly ash is prepared by the following method:

[0028] (1) Grind fly ash and metakaolin to 200 mesh and sieve to obtain 200 mesh powder; take 853.4 parts of metakaolin powder and 213.3 parts of brake pad powder respectively, start the mortar mixer and stir the dry mixture for 20-30 minutes until mixed Uniform;

[0029] (2) Water glass and sodium hydroxide solid are mixed and stirred according to 855 parts and 145 parts respectively until the sodium hydroxide solid is completely dissolved to obtain an alkaline activator, which is cooled to room temperature for subsequent use;

[0030] (3) Under stirring conditions, add the basic activator obtained in step (2) to the mixture obtained in step (1), mix and stir for 15min to 30min until it is evenly mixed, inject it into a mold of 40mm×40mm×160mm, and vibrate for 120s , after drying and curing at 30°C for 6 hours, demoulding; after demoulding, the specimen was cured at 30°C and 95% hu...

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Abstract

The invention belongs to the technical field of building materials and particularly relates to a metakaolin-based geopolymer added with coal ash and a preparation method of the metakaolin-based geopolymer. The preparation method comprises the following steps: respectively grinding coal ash and metakaolin into powder, and uniformly mixing, so as to obtain a mixture; adding strong base solid powderinto a Na2SiO3 solution, and uniformly stirring, so as to obtain an alkaline excitant; uniformly mixing the alkaline excitant with the mixture, and injecting the mixture of the alkaline excitant and the mixture into a mold; and carrying out drying maintenance at 30 DEG C for 6 hours, carrying out demolding, and carrying out maintenance at 30 DEG C and an environment humidity of over 95%, so as toobtain the metakaolin-based geopolymer. The metakaolin-based geopolymer prepared by virtue of the preparation method has excellent mechanical property, the recycling of waste is realized, and a new way is provided for the secondary utilization of the coal ash.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a metakaolin-based geological polymer added with fly ash and a preparation method thereof. Background technique [0002] Geopolymer is newly developed in recent years, it may replace cement in many occasions, and it is a new material with better performance than cement. Geopolymers are hard man-made rocks based on inorganic polymers produced by geochemical action or artificial imitation of geosynthesis. Geopolymer has the advantages of extremely low production energy consumption, high strength, fast hardening, excellent acid and alkali corrosion resistance, low permeability, adjustable thermal expansion coefficient, high temperature resistance and low thermal conductivity, excellent durability, and the function of solid core and solid waste. . [0003] Fly ash is a waste discharge from coal-fired power plants or other coal-fired facilities. At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/10C04B18/08
CPCC04B28/006C04B2201/50C04B2201/52C04B14/106C04B18/08C04B12/04C04B22/062Y02P40/10Y02W30/91
Inventor 白桃宋紫阁胡小弟刘博文
Owner WUHAN INSTITUTE OF TECHNOLOGY
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