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Building waste/alkali waste-based autoclaved aerated concrete building block and preparation method thereof

A technology of aerated concrete and construction waste, applied in the field of construction materials, can solve the problems of poor utilization of construction and industrial waste, unfavorable environmental protection and resource utilization, and achieve cost control, significant activity stimulation effect, high density low effect

Pending Publication Date: 2018-08-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above two construction and industrial wastes have not been well utilized, which is not conducive to environmental protection and resource utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method is as follows:

[0028] (1) Use waste concrete, waste bricks and tiles, and waste stones as construction waste, crush them through a 60-mesh sieve, and then ball mill them for 20 minutes;

[0029] (2) Put 43Kg of construction waste, 25Kg of alkali slag, 15Kg of lime, 15Kg of cement, 1.9Kg of gypsum, and 0.1Kg of aluminum powder in a mixer and stir at a low speed for 2 minutes to make a dry material, add 55Kg for wet mixing, and then mix the mixed material Let the slurry stand for 30 minutes;

[0030] (3) Pour the slurry into the mold, put the poured sample into an oven at 65°C for curing for 4 hours, and then demould the sample to obtain an aerated concrete block;

[0031] (4) put the block into the autoclave and autoclave at 1.5MPa for 6h to obtain the autoclaved block;

[0032] (5) Cool the autoclaved block naturally, and then place it in a constant temperature oven to dry it.

[0033] After testing, the performance test results are as follow...

Embodiment 2

[0037] The preparation method is as follows:

[0038] (1) Use waste concrete, waste bricks and tiles, and waste stones as construction waste, crush them through a 60-mesh sieve, and then ball mill them for 20 minutes;

[0039] (2) Put 48Kg of construction waste, 19.9Kg of alkali slag, 10Kg of lime, 20Kg of cement, 2Kg of gypsum, and 0.1Kg of aluminum powder in a mixer and stir at a low speed for 2 minutes to make a dry material, add 55Kg for wet mixing, and then mix the mixed material Let the slurry stand for 30 minutes;

[0040] (3) Pour the slurry into the mold, put the poured sample into an oven at 65°C for curing for 4 hours, and then demould the sample to obtain an aerated concrete block;

[0041] (4) put the block into the autoclave and autoclave at 1.5MPa for 6h to obtain the autoclaved block;

[0042] (5) Cool the autoclaved block naturally, and then place it in a constant temperature oven to dry it.

[0043] After testing, the performance test results are as follow...

Embodiment 3

[0047] The preparation method is as follows:

[0048] (1) Use waste concrete, waste bricks and tiles, and waste stones as construction waste, crush them through a 60-mesh sieve, and then ball mill them for 20 minutes;

[0049] (2) Put 53Kg of construction waste, 17Kg of alkali slag, 10Kg of lime, 18.9Kg of cement, 1Kg of gypsum, and 0.1Kg of aluminum powder in a mixer and stir at a low speed for 2 minutes to make a dry material, add 55Kg for wet mixing, and then mix the mixed material Let the slurry stand for 30 minutes; pour the slurry into the mold, put the poured sample into an oven at 65°C for 4 hours, and then demould the sample to obtain an aerated concrete block;

[0050] (3) Put the block into an autoclave and autoclave at 1.5 MPa for 6 hours to obtain an autoclaved block;

[0051] (4) Cool the autoclaved blocks naturally, and then place them in a constant temperature oven to dry them.

[0052] After testing, the performance test results are as follows:

[0053] Com...

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Abstract

The invention discloses a preparation method for preparing an autoclaved aerated concrete building block from building waste and alkali waste. The autoclaved aerated concrete comprises the following components in percentage by mass: 43 to 63 percent of building waste, 15 to 25 percent of alkali waste, 5 to 15 percent of lime, 15 to 20 percent of cement, 1 to 3 percent of gypsum and 0.1 percent ofaluminum powder, wherein the ratio of water to materials is 0.55. The autoclaved aerated concrete building block is prepared by stirring the components uniformly, molding by casting and performing autoclave curing. The building waste contains a large amount of silicon aluminum; CSH gel can be formed in the autoclaving process through alkali waste activation; the prepared autoclaved aerated concrete building block has properties of high strength, light weight, heat insulation and freezing resistance; various property indexes meet the A7.5B07 requirement in GB11968-2006 'autoclaved aerated concrete building block standard'; and a new approach is provided for recycling the building waste and the alkali waste.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a construction waste / alkali slag-based autoclaved aerated concrete block and a preparation method thereof. Background technique [0002] The degree of recycling of construction waste in my country is far lower than that of foreign developed countries. Most of the utilization of construction waste is limited to simple treatment. A large amount of construction waste has not been effectively utilized, which not only wastes resources but also pollutes the environment. The amount of construction waste in China has accounted for more than 1 / 3 of the total urban waste. On the other hand, it also shows that the comprehensive utilization of construction waste resources in my country has great potential, and if it is used as waste, it will be a cheap raw material. [0003] Soda slag is a solid waste in the soda ash industry, and a large amount of stockpiling has ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B38/02C04B111/20C04B18/16
CPCC04B28/10C04B2111/29C04B2201/20C04B2201/32C04B2201/50C04B18/16C04B7/02C04B22/143C04B22/0006C04B22/04C04B38/02Y02W30/91
Inventor 徐克猛张慧灵陈永亮杜金洋王梦婵陈润泽
Owner WUHAN UNIV OF SCI & TECH
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