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A controllable low-strength mine filling material

A mine filling and low-strength technology, applied in the field of controllable low-strength mine filling materials, can solve problems such as poor excavability, high subsidence value, and poor fluidity, and achieve low cost, low bleeding rate, and excellent performance.

Active Publication Date: 2022-04-05
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Filling materials in the traditional sense have always had problems such as high bleeding rate, poor fluidity, high subsidence value, and high cost, and the strength can only be between 4-8MPa, while traditional filling materials with high strength may also have problems. Difficulties such as poor excavation

Method used

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  • A controllable low-strength mine filling material
  • A controllable low-strength mine filling material
  • A controllable low-strength mine filling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The cement used in the experiment is mainly P.O 42.5 ordinary Portland cement.

[0033] The fly ash used in the experiment is mainly Class F and Class II.

[0034] The coal gangue sand used in the experiment is mainly continuous graded coarse sand with a particle size of 0.5-4.75mm.

[0035] The river sand used in the experiment is mainly medium sand with a particle size of 0.15-0.5mm.

[0036] The water reducer used in the experiment is mainly polycarboxylate water reducer, model ZH-h1, produced in Hebi Zhonghe Building Materials Co., Ltd.

[0037] The air-entraining agent used in the experiment is mainly ether air-entraining agent, model PEA-1, produced in Hebi Zhonghe Building Materials Co., Ltd.

[0038] Proportion: 45 parts of cement, 160 parts of fly ash, 1260 parts of gangue sand, 260 parts of river sand, 0.5 part of water reducing agent, and 0.01 part of air-entraining agent.

[0039] Performance reference standards: NB / T 51070-2017 "Test methods for coal min...

Embodiment 2

[0041] Experiment cement, with embodiment 1.

[0042] The fly ash used in the experiment is the same as in Example 1.

[0043] The coal gangue sand used in the experiment is the same as in Example 1.

[0044] The river sand used in the experiment is the same as in Example 1.

[0045] The water reducer used in the experiment is the same as in Example 1.

[0046] Experiment air-entraining agent, with embodiment 1.

[0047] Proportion: 50 parts of cement, 170 parts of fly ash, 1270 parts of gangue sand, 265 parts of river sand, 0.4 parts of water reducing agent, and 0.02 parts of air-entraining agent.

[0048] Performance reference standards: NB / T 51070-2017 "Test methods for coal mine paste filling materials", MT / T 420-1995 "High water filling materials", etc.

Embodiment 3

[0050] Experiment cement, with embodiment 1.

[0051] The fly ash used in the experiment is the same as in Example 1.

[0052] The coal gangue sand used in the experiment is the same as in Example 1.

[0053] The river sand used in the experiment is the same as in Example 1.

[0054] The water reducer used in the experiment is the same as in Example 1.

[0055] Experiment air-entraining agent, with embodiment 1.

[0056] Proportion: 50 parts of cement, 155 parts of fly ash, 1360 parts of coal gangue sand, 300 parts of river sand, 1 part of water reducing agent, and 0.01 part of air-entraining agent.

[0057] Performance reference standards: NB / T 51070-2017 "Test methods for coal mine paste filling materials", MT / T 420-1995 "High water filling materials", etc.

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Abstract

The invention discloses a controllable low-strength mine filling material. The controllable low-strength mine filling material includes the first sand component, the second sand component, cement, fly ash and admixture, in parts by weight, the cement is 35-90 parts; the fly ash is 150-190 parts part; the first sand component is 700-1400 parts; the second sand component is 250-1000 parts; the admixture is 0.01-2.5 parts; wherein the first sand component is coal gangue sand, and the second sand The components are selected from one or both of river sand and quartz sand. The filling material uses coal-based solid waste as the main component, and has high fluidity, low strength, low bleeding rate, small subsidence value, shrinkage resistance, workability and durability, excellent performance, environmental protection and low energy consumption Etc.

Description

technical field [0001] The invention belongs to the field of environment-friendly green building materials, and in particular relates to a controllable low-strength mine filling material. Background technique [0002] The central and western regions of my country have huge coal reserves, mining volumes and usage volumes, and the coal power and coal chemical industries are highly concentrated. With the rapid development of coal mining, coal-fired power generation and coal chemical industry, while supporting and promoting the rapid economic development in the east and the whole country, it also leaves a huge amount of coal-based solid waste in the central and western coal-producing regions, mainly including gasification slag, coal gangue, fly ash, desulfurization gypsum, furnace bottom slag, etc. The above five types of bulk coal-based solid waste have low comprehensive utilization rate, occupy a large amount of land, and seriously pollute the environment, which have become u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/00724C04B2201/50C04B18/12C04B14/06C04B14/068C04B18/08C04B2103/304C04B2103/302C04B2103/14
Inventor 王栋民白亚飞袁宁刘泽房奎圳邬兆杰王山虎
Owner CHINA UNIV OF MINING & TECH (BEIJING)