Wheat straw fiber-reinforced gangue geopolymer material and preparation method thereof

A geopolymer and fiber-reinforced technology, applied in the field of wheat straw fiber reinforced coal gangue geopolymer materials and preparation, can solve the problem of non-condensing strength of cement cementitious materials, reduce the alkalinity of cement cementitious materials, and hinder the hydration of cement particles and other problems, to achieve the effect of improving the cracking and toughening effect, slowing down the excessive consumption, and achieving significant environmental and social benefits

Inactive Publication Date: 2017-12-22
CHINA UNIV OF MINING & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when wheat straw fibers are added to the cementitious material, it will not only cause the cementitious material to not coagulate for a long time, but also cause problems such as a sudden drop in strength.
This is because wheat straw fibers contain a large amount of acidic substances such as phenols and organic acids. When they are added to cement cementitious materials, a large amount of acidic substances will reduce the alkalinity of cement cementitious materials and hinder the hydration of cement particles. Adding wheat straw fiber to the cementitious material not only does not have the effect of toughening and anti-cracking, but also brings the side effect of a sudden drop in strength.

Method used

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  • Wheat straw fiber-reinforced gangue geopolymer material and preparation method thereof
  • Wheat straw fiber-reinforced gangue geopolymer material and preparation method thereof
  • Wheat straw fiber-reinforced gangue geopolymer material and preparation method thereof

Examples

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Effect test

preparation example Construction

[0037] Implement the preparation method of the above-mentioned wheat straw fiber reinforced coal gangue geopolymer material: firstly carry out the crushing and calcination of coal gangue, then carry out the weighing, batching and mixing of materials, and finally carry out the preparation of wheat straw fiber reinforced coal gangue geopolymer material ,Specific steps are as follows;

[0038] (1) Crushing and grinding the gangue to make gangue powder, then placing the gangue powder in a high-temperature furnace and calcining at a constant temperature of 700°C-900°C for 0.5 hours to obtain the gangue powder; the gangue powder is The solid waste discharged during coal mining and coal washing is made by drying, crushing, grinding and calcination, and the grinding makes it reach a specific surface area of ​​≥350m 2 / kg, coal gangue particles with a particle size of less than 30 μm accounted for more than 90% of the total mass.

[0039] (2) Weigh the gangue powder, wheat straw fiber...

Embodiment 1

[0044] The preparation method of wheat straw fiber reinforced coal gangue geopolymer material, the composition and mass percentage of coal gangue geopolymer material are as follows: gangue powder 56.7%; mineral powder 40%; slaked lime 2.2%; wheat straw fiber 1% (accounting for powder body material); sodium silicate activator 26.7% (accounting for powder material by mass); NaOH 5.3% (accounting for powder material); water 26.7% (accounting for powder material).

[0045] Table 3 test mix ratio g

[0046]

[0047] First, the crushing and calcination of coal gangue are carried out, then the weighing, batching and mixing of materials are carried out, and finally the preparation of wheat straw fiber reinforced coal gangue geopolymer material is carried out;

[0048] (1) Crushing and grinding the gangue to make gangue powder, then placing the gangue powder in a high-temperature furnace and calcining at a constant temperature of 700°C-900°C for 0.5 hours to obtain gangue powder;

...

Embodiment 2

[0053] Embodiment 2: preparation method is identical with embodiment 1, omission. The difference is that the composition and mass percentage of the coal gangue geopolymer material are as follows: gangue powder 66.8%; mineral powder 30%; slaked lime 2.2%; wheat straw fiber 1% (accounting for powder material); Activator 26.7% (accounting for powder material by mass); NaOH 5.3% (accounting for powder material); water 26.7% (accounting for powder material).

[0054] Table 4 test mix ratio g

[0055]

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Abstract

The invention relates to a wheat straw fiber-reinforced gangue geopolymer material and a preparation method thereof. The geopolymer material comprises a powder material, wheat straw fibers and a liquid sodium water glass excitant. The preparation method comprises the following steps: by taking ground low calcined gangue micropowder as a primary raw material, doping a proper amount of granulated blast-furnace slag micropowder and slaked lime as an active calcium supplementing agent in an auxiliary agent; and doping the wheat straw fibers as an anti-crack reinforcing material and preparing the gangue geopolymer material which is high in strength and excellent in anti-crack performance with water glass as an excitant. The gangue is crushed and calcined, then the material is weighed, proportioned and mixed, and the wheat straw fiber-reinforced gangue geopolymer material is prepared. The material can replace cement and is applied to manufacturing of a concrete mixture, so that fast consumption of a limestone raw material in cement manufacturing can be alleviated, wastes are turned into wealth, various environmental pollution problems caused by accumulation of the gangue and incineration of the wheat straws are eliminated gradually, the utilization ratio of the waste gangue and the wheat straws is increased, the environment is protected, and thus the material is an energy-saving and environment-friendly building material.

Description

technical field [0001] The invention relates to the field of solid waste recycling, in particular to a wheat straw fiber-reinforced coal gangue geopolymer material and a preparation method thereof. Background technique [0002] Coal gangue is solid waste discharged during coal mining and coal washing. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. At present, the total stock of coal gangue in the country is about 4.5 billion tons, and it is still increasing year by year. Coal gangue contains combustible substances such as residual coal and carbonaceous mudstone. After long-term accumulation in the open air, spontaneous combustion often occurs and a large amount of harmful gases are emitted, causing air, soil, and water pollution, and more likely to cause geological disasters. Wheat straw is what remains after the wheat harvest is complete. At present, the annual output of wheat stra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B12/00
CPCC04B12/005Y02P40/10
Inventor 姬永生黄国栋刘翔宇肖理坤张莉刘本琳
Owner CHINA UNIV OF MINING & TECH
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