A kind of alkali excited coal gangue powder geopolymer cementitious material and preparation method thereof

A technology of geopolymers and coal gangue powder, which is applied in chemical instruments and methods, cement production, water/sludge/sewage treatment, etc., can solve problems that cannot meet the special construction technology and tunneling technology of shafts, affect the progress of tunneling work, Low construction efficiency and other problems, to achieve the effect of low price, improved water absorption performance, and control of mud

Active Publication Date: 2021-03-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high construction costs, low construction efficiency, and long construction period, which will seriously affect the progress of excavation work. The problem of muddy impact on equipment has not been fundamentally resolved, nor can it meet the requirements of special construction technology and excavation technology for shafts.

Method used

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  • A kind of alkali excited coal gangue powder geopolymer cementitious material and preparation method thereof
  • A kind of alkali excited coal gangue powder geopolymer cementitious material and preparation method thereof

Examples

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preparation example Construction

[0026] refer to figure 1 , the present invention also provides the preparation method of the above-mentioned alkali-activated coal gangue powder geopolymer cementitious material, comprising the following steps:

[0027] Step S1, weighing coal gangue powder, fly ash, and boiler slag according to the mass ratio of 1 to 5:0 to 7:0 to 5, and mixing them to obtain solid waste;

[0028] Step S2, weighing vitrified microbeads, expanded perlite, and perlite powder according to a mass ratio of 5-10:0-5:0-3 and mixing them to obtain an insulating material;

[0029] Step S3, adding thermal insulation material and alkali activator to the solid waste in sequence, then adding water and water reducer, fully stirring and mixing to obtain alkali-activated coal gangue powder geopolymer gelling material; wherein, the amount of thermal insulation material Accounting for 30% to 60% of the mass of solid waste, the amount of alkali activator accounts for 6% to 8% of the mass of solid waste, the amo...

Embodiment 1

[0033] Weigh 5kg of coal gangue powder, 25kg of fly ash, and 20kg of boiler slag and add them to the mixer and stir for 1min, fully stir to obtain solid waste; weigh 16.95kg of vitrified microbeads, 3.75kg of expanded perlite, and 4.3kg of perlite powder to fully Stir and mix to obtain thermal insulation material; dissolve sodium hydroxide analytically pure in water to prepare NaOH aqueous solution, then mix with water glass to obtain alkali activator; take 25kg thermal insulation material, 3.0kg alkali activator, and add them to 50kg solid waste in turn Then add 18kg of water and 0.35kg of polycarboxylate superplasticizer, and stir for 5 minutes to fully mix to obtain the alkali-activated coal gangue powder geopolymer cementitious material.

Embodiment 2

[0035] Weigh 20kg of coal gangue powder, 25kg of fly ash, and 5kg of boiler slag and add them to the mixer and stir for 1min, fully stir to obtain solid waste; weigh 18.75kg of vitrified microbeads, 4.5kg of expanded perlite, and 5.25kg of perlite powder to fully Stir and mix to obtain the insulation material; dissolve the analytically pure sodium hydroxide in water to prepare an aqueous NaOH solution, then mix it with water glass to obtain an alkali activator; take 28.5kg of insulation material, 3.9kg of Then add 17.5kg of water and 0.4kg of polycarboxylate superplasticizer to the waste, and stir for 5 minutes to fully mix to obtain the alkali-activated coal gangue powder geopolymer gelling material.

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Abstract

The invention provides an alkali-activated coal gangue powder geopolymer cementing material, which is prepared by mixing solid waste, a thermal insulation material, an alkali activator, a water reducing agent and water, wherein a mass ratio of the thermal insulation material to the solid waste is (0.3-0.6):1, a mass ratio of the alkali activator to the solid waste is (0.06-0.08):1, a mass ratio ofthe water reducing agent to the solid waste is (0.007-0.01):1, a mass ratio of the water to the solid waste is (0.3-0.6):1, the solid waste is composed of coal gangue powder, fly ash and boiler slagaccording to a mass ratio of (1-5):(0-7):(0-5), and the thermal insulation material is composed of vitrified micro-beads, expanded perlite and perlite powder according to a mass ratio of (5-10):(0-5):(0-3). The invention also provides a preparation method of the alkali-activated coal gangue powder geopolymer cementing material.

Description

technical field [0001] The invention relates to the technical field of solid waste utilization, in particular to an alkali-activated coal gangue powder geopolymer gelling material and a preparation method thereof. Background technique [0002] Coal gangue is solid waste discharged during the coal mining process and coal washing process. It is a black-gray rock with low carbon content and harder than coal associated with the coal seam during the coal formation process. Coal gangue includes excavation gangue during roadway excavation, gangue extracted from the roof, floor and interlayer during mining, and gangue picked out during coal washing. Its main component is Al 2 o 3 , SiO 2 , also contains varying amounts of Fe 2 o 3 , CaO, MgO, Na 2 O, K 2 O.P 2 o 5 , SO 3 And trace rare elements (gallium, vanadium, titanium, cobalt). A large number of piles of coal gangue not only occupy land resources, but also seriously affect the ecological environment. The dissolution ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C02F11/00C04B111/22C04B111/27
CPCC02F11/008C04B28/006C04B2111/00767C04B2111/22C04B2111/27C04B18/12C04B18/08C04B18/10C04B14/24C04B14/185C04B14/18C04B22/062C04B12/04C04B2103/302Y02P40/10
Inventor 王文婧秦渊刘元珍支鑫李珠陈强裴志鹏
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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