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Coal gangue-containing foundation pit backfill material and preparation method thereof

A technology for coal gangue and foundation pit, which is applied in the field of civil engineering and building materials, can solve problems such as environmental pollution of coal gangue, and achieve the effects of saving construction costs, good use effect and good compressive performance.

Pending Publication Date: 2021-03-19
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of pollution caused by coal gangue to the environment, the invention provides a foundation pit backfill material containing coal gangue and its preparation method, which can make full use of the waste coal gangue produced in the coal production process, and has the characteristics of environmental protection and energy saving

Method used

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  • Coal gangue-containing foundation pit backfill material and preparation method thereof
  • Coal gangue-containing foundation pit backfill material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] The foundation pit backfill material containing coal gangue in parts by weight, the specific proportioning in each embodiment is as follows:

[0029]

[0030] Among them, coal gangue is a single gradation with a particle size of 5-10, forming the skeleton structure of the backfill material, and its properties are shown in Table 1.

[0031] Table 1 Physical properties of coal gangue

[0032] Particle size (mm) Compressive performance (MPa) Bulk density (g / cm 3 )

Porosity(%) 5-10 4.2-4.7 1.2-1.8 40-42

[0033] The cement is composite Portland cement, and its strength grade is above 42.5.

[0034] Medium sand is coarse sand with a particle size of 0.5-1mm.

[0035] The water is ordinary tap water.

[0036] Fly ash refers to general fly ash with a particle size between 1 and 100 μm.

[0037] Silica fume is common silica fume whose main chemical composition is amorphous amorphous silicon oxide.

Embodiment 5

[0039] Adopt each raw material in embodiment 1 to prepare the foundation pit backfill material containing coal gangue, and its method may further comprise the steps:

[0040] (1) Take 20 parts of fly ash and 15 parts of silica fume, pour them into a fixed container, add 50 parts of water to dissolve, fully stir to form a mixed solution A;

[0041] (2) Mix 130 parts of cement with the solution A formed in step (1), pour it into the mixing pot, and stir for 60 seconds to form the mixed solution B;

[0042] (3) Fully mix 300 parts of coal gangue and 60 parts of medium sand, weigh half of it and add it to a stirring pot equipped with solution B, and stir for 90 seconds to form mixture C;

[0043] (4) Pour the remaining coal gangue and medium sand into the stirring pot successively, fully stir for 90s, and make the foundation pit backfill material containing coal gangue;

[0044] (5) Pour out the foundation pit backfill material containing coal gangue prepared above from the stirr...

Embodiment 6

[0046] Adopt each raw material in embodiment 2 to prepare the foundation pit backfill material that contains coal gangue, and its method may further comprise the steps:

[0047] (1) Take 25 parts of fly ash and 12 parts of silica fume, pour them into a fixed container, add 40 parts of water to dissolve, fully stir to form a mixed solution A;

[0048] (2) Mix 120 parts of cement and the solution A formed in step (1) evenly, pour into the stirring pot, and stir for 70 seconds to form the mixed solution B;

[0049] (3) Fully mix 320 parts of coal gangue and 65 parts of medium sand, weigh half of it and add it to a stirring pot equipped with solution B, and stir for 80 seconds to form mixture C;

[0050] (4) Pour the remaining coal gangue and medium sand into the stirring pot in turn, fully stir for 100s, and prepare the foundation pit backfill material containing coal gangue;

[0051] (5) Pour out the foundation pit backfill material containing coal gangue prepared above from th...

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Abstract

The invention provides a coal gangue-containing foundation pit backfill material and a preparation method thereof, and the coal gangue-containing foundation pit backfill material comprises the following components in parts by weight: 300-350 parts of coal gangue, 110-130 parts of cement, 60-80 parts of medium sand, 35-50 parts of water, 20-30 parts of fly ash and 10-15 parts of silica fume. The preparation method comprises the following steps: (1) adding water to dissolve the fly ash and the silica fume; (2) adding cement; (3) mixing the coal gangue and the medium sand, weighing half of the mixture, and adding; (4) adding residual coal gangue and medium sand; (5) forming and maintaining. The problem that existing waste coal gangue occupies a large amount of land is solved. The manufacturing process is simple, green and environment-friendly, and the cost is low.

Description

technical field [0001] The invention belongs to the field of civil engineering and construction materials, and in particular relates to a foundation pit backfill material containing coal gangue and a preparation method thereof. Background technique [0002] Coal gangue is the 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 that is associated with the coal seam during the coal formation process. Its main component is di aluminum and silica. Since our country is a big coal producing country, the amount of coal gangue generated in the process of coal mining and coal washing reaches more than 1 billion tons every year, and the sulfides in coal gangue will cause great pollution to the environment, and a large amount of discarded coal Gangue often needs to occupy a large area of ​​land, and in a dry and high-temperature environment, it may even spontaneously ignite and cause a fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2111/00017C04B18/12C04B14/06C04B18/08C04B18/146
Inventor 蔡昕原刘向荣
Owner XIAN UNIV OF SCI & TECH
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