Coal-gangue lightweight aggregate concrete

A technology of lightweight aggregate concrete and coal gangue, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of floating and compressive strength that do not meet the concrete compressive standard, and achieve self-weight reduction, Low elastic modulus, effect of reducing foundation load

Inactive Publication Date: 2015-12-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to efficiently utilize coal gangue resources, and our country is now in the intensive period of infrastructure construction, tunnels are used to replace traditional coarse and fine aggregates (crushed stones, river sand), and methods of using them in the construction industry are studied to reduce coal gangue. Adverse effects on the environment. Existing concrete with coal gangue as aggregate often floats during the mixing process because of its light weight (with voids), or its 28d compressive strength after molding does not meet the requirements of concrete. Compression standard

Method used

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  • Coal-gangue lightweight aggregate concrete
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A coal gangue lightweight aggregate concrete is made by mixing water, cement, coal gangue aggregate, coal gangue sand, water reducing agent and silica fume;

[0011] The added weight of each component is:

[0012]

[0013] The compression test result after 24 hours of steam curing is 16.6Mpa;

[0014] A kind of preparation method of coal gangue lightweight aggregate concrete:

[0015] 1. Weigh 2.6kg of water and add 0.013kg of water reducer to the water and stir evenly;

[0016] 2. Pour 6.47kg of gangue aggregate, 3.39kg of gangue sand, and 4.55kg of cement into a 30-liter mixer and stir evenly;

[0017] 3. Pour in 2.6kg of water and stir, and stand still for one minute every two or three minutes to fully absorb the water. After stirring three times, it can be formed;

[0018] 4. The mold can be removed after 24 hours.

Embodiment 2

[0020] A coal gangue lightweight aggregate concrete is made by mixing water, cement, coal gangue aggregate, coal gangue sand, water reducing agent and silica fume;

[0021] The added weight of each component is:

[0022]

[0023] The compression test result after 24 hours of steam curing is 20.8Mpa;

[0024] A kind of preparation method of coal gangue lightweight aggregate concrete:

[0025] 1. Weigh 2.3kg of water and add 0.05kg of water reducer to the water and stir evenly;

[0026] 2. Pour 6.47kg of gangue aggregate, 3.39kg of gangue sand, and 4.55kg of cement into a 30-liter mixer and stir evenly;

[0027] 3. Pour in 2.3kg of water and stir, and stand still for one minute every two or three minutes to fully absorb the water. After stirring three times, it can be formed;

[0028] 4. The mold can be removed after 24 hours.

Embodiment 3

[0030] A coal gangue lightweight aggregate concrete is made by mixing water, cement, coal gangue aggregate, coal gangue sand, water reducing agent and silica fume;

[0031] The added weight of each component is:

[0032]

[0033] The compression test result after 24 hours of steam curing is 24.1Mpa;

[0034] A kind of preparation method of coal gangue lightweight aggregate concrete:

[0035] 1. Weigh 2.4kg of water and add 0.035kg of water reducer to the water and stir evenly;

[0036] 2. Pour 5.51kg of gangue aggregate, 4.22kg of gangue sand, and 4.77kg of cement into a 30-liter mixer and stir evenly;

[0037] 3. Pour in 2.4kg of water and stir, and stand still for one minute every two or three minutes to fully absorb the water. After stirring three times, it can be formed;

[0038] 4. The mold can be removed after 24 hours.

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Abstract

Disclosed coal-gangue lightweight aggregate concrete is prepared by mixing water, cement, coal gangue aggregate, coal gangue sand, a water reducer and silica fume, the coal gangue aggregate is coal gangue large-particle-size composition, and the coal gangue sand is prepared coal gangue small-particle-size composition. The coal-gangue lightweight aggregate concrete possesses characteristics of being lightweight, high in strength, warm-keeping, fireproof and the like, is good in deformabiity, low in elastic modulus and relatively large in shrinkage and creep in an ordinary way, and is capable of reducing basic load, thereby reducing the whole building deadweight. According to the technical scheme, a large amount of coal gangue which is generated by coal mine and possesses pollution property is changed into valuables from waste, and is effectively applied to road paving and other municipal and building construction, and environment pollution is reduced.

Description

technical field [0001] The invention relates to the field of concrete products, in particular to a coal gangue lightweight aggregate concrete. Background technique [0002] Coal gangue is an industrial waste abandoned during the mining and washing process of coal mines. 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. It is estimated that my country's annual emissions account for about 10% of the total coal output. So far, about 4.8 billion tons have been stockpiled. It will spontaneously ignite and cause serious pollution to the atmosphere and groundwater. In order to efficiently utilize coal gangue resources, and our country is now in a concentrated period of infrastructure construction, tunnels are used to replace traditional coarse and fine aggregates (crushed stones, river sand), and methods of using them in the construction industry are studied to reduce coal gangue. Adverse effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/12
CPCY02W30/91
Inventor 严冰宋战平王艳
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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