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Carbonization maintenance aerated concrete

A technology of aerated concrete and carbonation curing, which is applied in the field of building material aerated concrete, which can solve the problems of low strength, long curing time, and low strength, and achieve the effects of low cost, shortened production cycle, and reduced emissions

Inactive Publication Date: 2008-03-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The air-entrained concrete made by the above method has a long curing time and low strength after curing
Especially the aerated concrete made of materials such as waste cement or steel slag has lower strength

Method used

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  • Carbonization maintenance aerated concrete
  • Carbonization maintenance aerated concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Portland cement produced by a cement company in Jinan is selected as raw material, and its chemical composition is: CaO64.81%, SiO 2 21.58%, Fe 2 o 3 3.20%, Al 2 o 3 4.90%, MgO3.70%, SO 3 0.52%.

[0032] Mix the above raw materials with an appropriate amount of water, and add an appropriate amount of gas-generating agent and other additives. After mixing and stirring, pouring and foaming, and resting the embryo body, cut it into 76×38×12mm 3 The bricks are cured with industrial waste gas containing 25% carbon dioxide wt, the curing gas pressure is 1.5bar, and the carbonization curing temperature is 50-100°C. After 5 hours of curing, finished bricks are made.

[0033] After carbonation curing, the weight increase of Portland cement aerated concrete bricks absorbs about 14% of carbon dioxide; its compressive strength is: 6.8MPa.

[0034] The SEM-EDS analysis diagram of the Portland cement of the present invention is shown in Figure 2, from which it can be seen that...

Embodiment 2

[0036] The steel slag discharged by Jinan Iron and Steel Group is selected as the raw material, and its chemical composition is: CaO38.91%, SiO 2 13.32%, Fe 2 o 3 23.11%, FeO 21.62%, Al 2 o 3 1.57%, MgO7.61%, P 2 o 5 1.47%, MnO 2 2.29%.

[0037] Add appropriate amount of water to the above raw materials, mix evenly, and add appropriate amount of gas generating agent and other additives, after mixing and stirring, pouring and foaming, and resting embryo body, cut into 76×38×12mm 3 The bricks are cured with industrial waste gas containing more than 25% carbon dioxide wt, the curing gas pressure is 2bar, and the carbonization curing temperature is 50-150°C. After 10 hours of curing, finished bricks are made.

[0038] After carbonization curing, the weight of steel slag increases by absorbing about 13% of carbon dioxide, and its compressive strength is: 7.2MPa.

[0039] The XRD analysis diagrams of the above-mentioned carbonized materials before and after carbonization ar...

Embodiment 3

[0042] Choose waste cement as carbonized material, its chemical composition and its weight percentage are:

[0043] CaO

SiO 2

Al 2 o 3

Fe 2 o 3

MgO

Na 2 o

SO 3

LOSS

58.1

14.8

3.9

2.0

2.0

0.85

3.8

13.8

[0044] Mix the above raw materials with air-entraining agent and water evenly, press into air-entrained concrete, cut into 76×38×12mm 3 The bricks are cured with industrial waste gas containing 45% carbon dioxide wt. The curing gas pressure is 5 bar, and the carbonization curing temperature is 50-100°C. After 15 hours of curing, finished bricks are made.

[0045] After carbonization curing, the weight of steel slag increases to absorb about 11% of carbon dioxide, and its compressive strength is: 5.2MPa.

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Abstract

The present invention relates to a carbonized maintained aerated concrete prepared by utilizing steel slag and cements to absorb the carbon dioxide gas. The carbonized maintenance aerated concrete is manufactured by adopting the following method: the steel slag or cement containing carbonized components can be taken as raw materials, the air-entraining agents and the water are added in the raw materials. After being mixed uniformly, the generated mixtures are pressed and manufactured into the aerated concrete. Under the maintenance of the carbonized gas, the aerated concrete is made into the carbonized maintained aerated concrete; the weight percentage that the carbonized components take in the raw materials is no less than 20 percent; the carbonized gas is the carbon dioxide gas; the maintain conditions are that the concentration of the carbon dioxide is larger than wt15 percent, the pressure of the curing gas is larger than 1bar and the carbonization and maintenance temperature ranges from 30 to 200 Celsius system. The industrial waste gas is utilized for the technology, thus reducing the exhaust of the greenhouse gas, the carbon dioxide, preparing the aerated concrete products with good performance and shortening the production cycle. The beneficial effects of the present invention are that the waste is utilized, the environment is protected, the energy is saved and the cost is low.

Description

(1) Technical field [0001] The invention relates to a building material aerated concrete, in particular to carbonation curing aerated concrete prepared by absorbing carbon dioxide gas from steel slag and cement as main materials. (2) Background technology [0002] Due to the increase in population and the increasing scale of human production activities, carbon dioxide (CO2) released into the atmosphere 2 ), carbon monoxide (CO) and other greenhouse gases are increasing, leading to changes in the composition of the atmosphere. Air quality is affected, and the climate tends to warm gradually. Due to global warming, it will have various impacts on the world. Higher temperatures can melt polar glaciers, and the sea level will rise by 6 centimeters every 10 years, which will cause some coastal areas to be submerged. Global warming may also affect changes in rainfall and atmospheric circulation, making the climate abnormal and prone to drought and flood disasters, which may lead...

Claims

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Application Information

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IPC IPC(8): C04B22/06C04B103/30
CPCC04B28/082C04B28/02
Inventor 常钧黄世峰叶正茂刘福田周宗辉程新
Owner UNIV OF JINAN
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