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Novel cementing material with carbon sequestration capacity, and preparation and application method thereof

A gelling material and capacity technology, applied in the field of new gelling material with carbon sequestration capacity and its preparation and use, can solve the problems of large consumption of fossil resources, high pollution, high energy consumption, etc., and achieve low energy consumption and hydration process Fast, intensity-building effect

Inactive Publication Date: 2017-05-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional Portland cement is currently the most widely used cementitious material, but its production process has the characteristics of high energy consumption and high pollution. It not only consumes a lot of fossil resources, but also emits a lot of carbon dioxide.

Method used

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  • Novel cementing material with carbon sequestration capacity, and preparation and application method thereof
  • Novel cementing material with carbon sequestration capacity, and preparation and application method thereof
  • Novel cementing material with carbon sequestration capacity, and preparation and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Weigh 5g peptone, 3g beef extract, 5g NaCl, MnSO 4 ·H 2 O is 5mg, dissolved in 1000mL deionized water, prepared into the required medium solution, adjusted to pH 7, sterilized at 125°C for 25 minutes, then taken out to be cooled, and inoculated into the cooling medium solution with Bacillus glaciens, Cultivate with shaking at 37°C, with an oscillation frequency of 170r / min, and a culture time of 24h;

[0032] (2) Using porous gypsum as the wall material, silicate bacteria as the core material, spray drying, the inlet air temperature is controlled at 150°C; the outlet air temperature is controlled at 80°C, and the final load is 5.0×10 9 Cells / gram, prepared into silicate bacterial powder;

[0033] (3) Mixing 20 parts of silicate bacterial powder and 100 parts of calcium hydroxide to prepare the gelling material of the present invention;

[0034] (4) Mix 25 parts of the cementitious material with 10 parts of water and form it. After standing for 48 hours, put it in a carbon ...

Embodiment 2

[0036] (1) Weigh 5g peptone, 3g beef extract, 5g NaCl, MnSO 4 ·H 2 O is 5mg, dissolved in 1000mL deionized water, prepared into the required medium solution, adjusted to pH 7, sterilized at 125°C for 25 minutes, then taken out to be cooled, and inoculated into the cooling medium solution with Bacillus glaciens, Cultivate with shaking at 37°C, with an oscillation frequency of 170r / min, and a culture time of 24h;

[0037] (2) Using porous gypsum as the wall material, silicate bacteria as the core material, spray drying, the inlet air temperature is controlled at 150°C; the outlet air temperature is controlled at 80°C, and the final load is 5.0×10 9 Cells / gram, prepared into silicate bacterial powder;

[0038] (3) Mixing 20 parts of silicate bacterial powder and 100 parts of calcium hydroxide to prepare the gelling material of the present invention;

[0039] (4) 25 parts of the gelling material and 10 parts of water are mixed and molded. Compared with Example 1, the previous steps are c...

Embodiment 3

[0041] (1) 20 parts of gypsum and 100 parts of calcium hydroxide are mixed to prepare a cementitious material, compared to Example 1 without microorganisms;

[0042] (2) Mix 25 parts of the cementitious material with 10 parts of water and form it. After standing for 48 hours, put it in a carbon dioxide autoclave at a temperature of 20°C, a relative humidity of 60%, and maintain a pressure of 0.3MPa. 2 With a gas concentration of 99% and keeping aeration for 180 minutes, the cementitious material has also been consolidated. Its compressive strength is 3.91MPa, as shown in Table 1.

[0043] Analysis of the results of Example 1, Example 2, and Example 3:

[0044] Compared with Example 1, all the preparation methods of Example 2 are basically the same. The difference is that after the sample of Example 2 is left for 48 hours, it is not put into a carbon dioxide autoclave for further curing for 3 hours, and its strength is only 0.56 MPa; Example 1 After 3 hours of carbon dioxide pressure ...

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Abstract

The invention discloses a novel cementing material with a carbon sequestration capacity, and a preparation and application method thereof. The preparation and application method comprises the steps of preparing silicate bacteria liquid with the cell concentration being 10<7> to 10<8> cell / mL, adopting a spray drying method, utilizing porous calcium carbonate or porous gypsum to load silicate bacteria, preparing into silicate bacteria powder, and mixing with calcium hydroxide to obtain the cementing material; mixing the cementing material with water for forming, standing for 24 to 48 hours, adding into a carbon dioxide pressure kettle, keeping the pressure ranging from 0.2MPa to 0.6MPa and the CO2 gas concentration ranging from 20 percent to 100 percent, and keeping ventilating for 60 to 300 minutes, so that the cementing material accomplishes solidification. The cementing material provided by the invention is prepared at normal temperature and normal pressure, is low in energy consumption and pollution free, can absorb carbon dioxide, can be reinforced within 3 days, and has significance on energy conservation and emission reduction.

Description

Technical field [0001] The invention relates to a method for preparing and using a new type of cementitious material with the ability to fix carbon. It uses porous gypsum or porous calcium carbonate to adsorb microorganisms to prepare microbial powder. After mixing in an appropriate amount of calcium hydroxide, a method with the ability to fix carbon can be prepared New type of cementitious material. The gelling material can absorb carbon dioxide after reacting with water and has gelling properties, and belongs to the technical field of building materials. [0002] technical background [0003] Traditional Portland cement is currently the most widely used cementitious material, but its production process is characterized by high energy consumption and high pollution, which not only consumes a large amount of fossil resources, but also emits a large amount of carbon dioxide. In recent years, carbon emissions have received great attention from governments. In particular, my country...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B28/10C04B40/02
CPCC04B28/14C04B28/10C04B40/0231C04B2201/50C04B2103/0001C04B22/064C04B14/28
Inventor 王瑞兴刘雨丁泽晨马锦雅古震琦吴利民王佳扬
Owner SOUTHEAST UNIV
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