Preparation and use method of fly ash based mineral polymer

A technology of mineral polymers and application methods, which is applied in the preparation and application fields of fly ash-based mineral polymers, can solve the problems of waste of soil and cultivated land, consumption of fuel and energy, and low activity of kaolin, so as to save energy and avoid Good effect on pollution and impermeability

Inactive Publication Date: 2009-01-28
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. Kaolin is widely distributed, but as an important component of soil, it is a limited resource, and a large amount of use will cause waste of soil and cultivated land
[0008] 2. Due to the relatively low activity of kaolin, it must be calcined twice to synthesize mineral polymers, which consumes a lot of fuel and energy
However, due to the great differences between fly ash and kaolin in terms of composition, structure, activity influencing factors, polymerization and reaction mechanism, preparation technology, and polymer performance, most of the current applications are mixed with a small amount of fly ash-based mineral polymers. Mixed in traditional cement to form a product with a low degree of polymerization, and there is no perfect and convenient technical solution to promote the application of pure fly ash-based mineral polymers in the field of building cementitious materials
[0010] This shows that above-mentioned existing geopolymer cementitious material obviously still has inconvenience and defect in preparation and application, and urgently needs to be further improved

Method used

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  • Preparation and use method of fly ash based mineral polymer
  • Preparation and use method of fly ash based mineral polymer
  • Preparation and use method of fly ash based mineral polymer

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preparation example Construction

[0025] The raw materials for preparing the fly ash-based mineral polymer in the present invention are fly ash and activator solution.

[0026] Selection of fly ash raw materials:

[0027] The present invention requires that the fly ash of the second grade or above is selected as a raw material, and its chemical composition is mainly Al with a mass percentage of 25-40%. 2 o 3 , 35-60% SiO 2 , also contains less than 8% CaO.

[0028] Preparation of stimulant solution:

[0029] The activator solution used in the present invention is a silicate solution or a water glass solution, wherein the silicate solution can be a sodium silicate solution or a potassium silicate solution, and the concentration of the solution is 2mol / L-5mol / L; the water glass solution The main components are sodium silicate or potassium silicate, and monomeric silicon oxide, with a solid content of 25-40% and a modulus of 1.0-1.5.

[0030] The preparation and application method of the fly ash-based minera...

Embodiment 1

[0038] With 5mol / L K 2 SiO 3 The solution is used as an activator, using primary fly ash (calcium content 3.04%) as a raw material, and the liquid-solid volume mass ratio is 0.3L / kg, mixed and stirred to reach a standard consistency, and the molded product, after 7 days of steam curing at 50 ° C, is resistant to The compressive strength reaches 57.0MPa. It is tested in accordance with relevant cement standards. The long-term durability of the product (resistance to sulfate, hydrochloric acid corrosion, alkali-aggregate reactivity, etc.) meets industry standards.

Embodiment 2

[0040] at 2mol / L K 2 SiO 3 The solution is used as an activator, using secondary fly ash (calcium content 4.40%) as a raw material, and the liquid-solid volume mass ratio is 0.3L / kg mixed and stirred to reach a standard consistency. After 7 days of steam curing at 65°C, the molded product is The compressive strength is up to 20.1MPa, tested in accordance with relevant cement standards, and the long-term durability of the product (resistance to sulfate, hydrochloric acid corrosion, alkali-aggregate reactivity, etc.) meets industry standards.

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Abstract

The invention relates to a preparation for a fly ash-based geopolymer and an application method thereof. The method mainly comprises the following steps: excitant solution and fly ash are mixed and stirred to paste; the paste is injected into a mold frame for molding; the molded product is maintained; the excitant solution is 2mol/L-5mol/L of silicate solution or water glass solution with the solid content to be 25-40% and the modulus to be 1.0-1.5. The preparation and the application method of the fly ash-based geopolymer fully use the industrial waste fly ash, which has the advantages of reducing cost, being favorable for environmental protection, reducing energy consumption and convenient application; the product obtained has the excellent characteristic of geopolymer.

Description

technical field [0001] The invention relates to a preparation and application method of a building cementitious material, in particular to a preparation and application method of a fly ash-based mineral polymer. Background technique [0002] In the 1970s, French scientist Joseph Davidovits and other scholars conducted research on ancient concrete buildings (such as ancient Egyptian pyramids, ancient Roman Colosseum, etc.) and found that there is a three-dimensional network with organic polymers in these buildings. Similar in shape and structure, the main body is inorganic [SiO 4 ] and [AlO 4 ] Tetrahedral polymer, this polymer makes these ancient buildings have excellent durability, even in harsh environments, it can be maintained for thousands of years without damage. Since then, Joseph Davidovits has proposed the concept of mineral polymers (Geopolymers) . [0003] Mineral polymers have a three-dimensional network structure. Si-O bonds and Al-O bonds are the most stable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCC04B28/008C04B2111/00017Y02P40/10Y02W30/91C04B12/04C04B18/08
Inventor 王栋民李俏侯云芬刘子科范德科张守祺
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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