Method for preparing alkali-activated coal gangue concrete from coal gangue mainly

A coal gangue concrete and main raw material technology, which is applied in the field of preparing alkali-activated coal gangue concrete with coal gangue as the main raw material, can solve the problem of low utilization rate of coal gangue, achieve significant environmental and social benefits, and alleviate the problem of non-renewable resources Consumption, the effect of alleviating high energy consumption

Inactive Publication Date: 2019-02-22
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The object of the present invention is to overcome the disadvantages of low utilization rate of coal gangue, and use the crushed coal gangue as the cementitious material, fine aggregate and coarse aggregate for preparing alkali-activated gangue concrete respectively, and provid

Method used

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  • Method for preparing alkali-activated coal gangue concrete from coal gangue mainly
  • Method for preparing alkali-activated coal gangue concrete from coal gangue mainly
  • Method for preparing alkali-activated coal gangue concrete from coal gangue mainly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A method for preparing alkali-activated coal gangue concrete with coal gangue as the main raw material, which is characterized in that: firstly, the coal gangue block is crushed, and then screened. The coal gangue particles with a particle size of less than 0.15mm after crushing are further ball-milled and made into coal gangue micropowder to make the specific surface area ≥ 350m 2 / kg, and ultra-fine coal gangue powder with a particle size of less than 50 μm accounts for more than 90% of the total mass, which is used to prepare the cementitious material of alkali-activated coal gangue concrete. The coal gangue particles with a particle size greater than 0.15mm and less than 0.5mm are further screened and configured into continuous gradation to prepare fine aggregates of the alkali-activated gangue concrete. The coal gangue block whose particle size is greater than 0.5mm and less than 30mm is further screened and configured into continuous gradation, so as ...

Embodiment 2

[0034] Embodiment 2: preparation method is identical with embodiment 1, omission. The difference is: the composition of the alkali-activated coal gangue concrete material and its mass percentage are as follows: the cementitious material is 55% of ground coal gangue micropowder (amount of 181.5kg / m 3 ); blast furnace granulated slag powder 40% (dosage 132kg / m 3 ); ground slaked lime powder 5% (dosage 16.5kg / m 3 ); the fine aggregate is coal gangue sand (amount 651kg / m 3 ); the coarse aggregate is coal gangue crushed stone (amount 1056kg / m 3 ); liquid sodium silicate with a modulus of 2.75 (dosage 88kg / m 3 ); caustic soda (NaOH dosage 17.6kg / m 3 ); water (amount 92.4kg / m 3 );

[0035] Table 3 Test mix ratio kg / m 3

[0036]

Embodiment 3

[0037] Embodiment 3: preparation method is identical with embodiment 1, omission. The difference is: the composition of the alkali-activated coal gangue concrete material and its mass percentage are as follows: the cementitious material is 35% of ground coal gangue micropowder (amount of 115.5kg / m 3 ); blast furnace granulated slag powder 60% (dosage 198kg / m 3 ); ground slaked lime powder 5% (dosage 16.5kg / m 3 ); the fine aggregate is coal gangue sand (amount 651kg / m 3 ); the coarse aggregate is coal gangue crushed stone (amount 1056kg / m 3 ); liquid sodium silicate with a modulus of 2.75 (dosage 88kg / m 3 ); caustic soda (NaOH dosage 17.6kg / m 3 ); water (amount 92.4kg / m 3 );

[0038] Table 4 Test mix ratio kg / m 3

[0039]

[0040] Table 5 Properties of coal gangue concrete stimulated by alkali with different mix ratios

[0041]

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Abstract

The invention discloses a method for preparing alkali-activated coal gangue concrete from coal gangue mainly and belongs to the method applied to preparation of alkali-activated coal gangue concrete.According to the method, coal gangue blocks are broken into coal gangue particles with different grain size range, the coal gangue particles are used as gel materials, fine aggregates and rough aggregates respectively for preparing the alkali-activated coal gangue, and thus, consumption of non-renewable resources such as cement, sand and pebbles is omitted. Besides, the alkali-activated coal gangue concrete is featured by early strength and high strength, and has functions of shortening maintenance time, accelerating construction progress and reducing construction cost, can substitute for cement concrete, can not only avoid the environmental pollution caused by accumulation of a great amount of industrial solid wastes, but weaken dependency on cement and reduce consumption of the non-renewable resources, and has a great significance for China, the country has the problems of energy deficiency and severe environmental pollution.

Description

technical field [0001] A method for preparing alkali-activated gangue concrete using coal gangue as the main raw material Background technique [0002] Coal gangue is a kind of rock associated and symbiotic with coal in the process of coal formation. It is a solid waste produced in the process of coal mining and cleaning processing. The amount of gangue discharged from coal mines accounts for about 10%-25% of the total coal mining. %, coal gangue has become the industrial solid waste with the largest accumulation volume and the most land occupation in my country. 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 residual coal, carbonaceous mudstone, and other combustible substances. After long-term accumulation in the open air, spontaneous combustion often occurs and emits a large amount of CO, CO 2 , SO 2 , H 2 S, and other organic harmful gases, cause air, soil, and water po...

Claims

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Application Information

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IPC IPC(8): C04B28/00
CPCC04B28/006C04B2201/50C04B18/12C04B22/062C04B12/04
Inventor 黄国栋
Owner ANHUI UNIV OF SCI & TECH
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