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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AI-Extracted Technical Summary

Problems solved by technology

The air-entrained concrete made by the above method has a long curing time and low strength after curin...

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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.

Technology Topic

SlagIndustrial waste +10

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Experimental program(3)

Example Embodiment

[0030] Example 1:

[0031] Choose a cement company in Jinan to produce Portland cement as the 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 appropriate amount of water, and add appropriate amount of gas generating agent and other additives. After mixing, stirring, pouring and foaming, and the embryo body is stopped, cut into 76×38×12mm 3 The bricks are cured with industrial waste gas containing 25% carbon dioxide wt. The curing gas pressure is 1.5 bar and the carbonization curing temperature is 50-100°C. After 5 hours of curing, finished bricks are made.

[0033] After carbonization 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 FIG. 2, and it can be seen from the diagram that a large number of calcium carbonate crystals of 1-2 μm are formed in the Portland cement aerated concrete after carbonization. Compared with Portland carbide cement solid brick, the crystal size is larger and the carbonization efficiency is improved.

Example Embodiment

[0035] Example 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 the above raw materials, add appropriate amount of water, mix well, and add appropriate amount of gas generating agent and other additives. After mixing, stirring, pouring and foaming, and the embryo body is stopped, 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 and curing, the weight of steel slag increases by about 13% of carbon dioxide absorption, and its compressive strength is 7.2MPa.

[0039] The XRD analysis chart of the carbonized material before and after carbonization is shown in Fig. 1. The upper figure is the XRD analysis chart after carbonization, and the lower figure is the XRD analysis chart before carbonization. In the figure, 1-CaCO 3 , 2-dicalcium silicate (C 2 S), 3-Calcium iron aluminate 4-aragonite. It can be seen from the figure that after carbonization, CaCO 3 The content is significantly increased.

[0040] The SEM-EDS image of the above carbonized material is shown in Figure 3. From the electron microscope photos, it can be seen that the size of calcium carbonate crystals is about 3-4μm, which is significantly larger than that of Portland carbide cement aerated concrete bricks, indicating that its carbonization effect is better.

Example Embodiment

[0041] Example 3:

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

[0043] CaO

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

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

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PUM

Property	Measurement	Unit
Compressive strength	6.8	mPa
Compressive strength	7.2	mPa
Crystal size	3.0 ~ 4.0	µm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Emission reduction
Shorten the production cycle

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Low cost Greenhouse gas Carbon dioxide Carbonization Production cycle Materials science Raw material

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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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