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Calcium-magnesium carbonate gel material and preparation method thereof

A cementitious material, carbonate technology, applied in the field of building materials, to achieve the effect of promoting energy saving and emission reduction, excellent flexural strength and compressive strength, and low cost

Active Publication Date: 2015-04-01
苏州博纽强新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Researchers at the University of Cambridge in the United Kingdom used highly active magnesia or a mixture of active magnesia and fly ash. At room temperature, CO 2 Accelerated carbonization of activated magnesia cement at a concentration of 5%-20% to prepare building materials with higher strength, but the required time is 28 days

Method used

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  • Calcium-magnesium carbonate gel material and preparation method thereof
  • Calcium-magnesium carbonate gel material and preparation method thereof
  • Calcium-magnesium carbonate gel material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Fly ash, activated magnesia and cement are selected as the main raw materials. In terms of mass percentage, fly ash accounts for 50%, active magnesium oxide accounts for 20%, and cement accounts for 30%. The activity index of activated magnesium oxide is 50s, and the specific surface area is 55m 2 / g. The cement is Portland cement with a specific surface area of ​​420m 2 / kg. The fly ash was taken from a thermal power plant in Nanjing, and the CaO content was 4.8% (mass ratio). Mix the above three raw materials evenly, add water, stir to make a uniform slurry, and cast a 40×40×40mm test piece. Using CO 2 Conservation, CO 2 The concentration is 99.9%, the pressure is 1.5MPa, the carbonization temperature is 40°C, and the reaction takes 3 hours. After the carbonization reaction, the weight increase (that is, the absorption of carbon dioxide) is about 11%, the flexural strength of the specimen is 4.9MPa, and the compressive strength is 45MPa.

Embodiment 2

[0030] Select ground slag, active magnesium oxide (same as embodiment 1) and cement (same as embodiment 1) for use as main raw materials. The specific surface area of ​​ground slag is 450m 2 / kg, the CaO content is 36%, and the MgO content is 12% (mass ratio). In terms of mass percentage, slag accounts for 60%, active magnesium oxide accounts for 20%, and cement accounts for 20%. Mix the above three raw materials evenly, add water, stir to make a uniform slurry, and cast a 40×40×40mm test piece. Using CO 2 Conservation, CO 2 The concentration is 99.9%, the pressure is 1.0MPa, the carbonization temperature is 40°C, and the reaction takes 6 hours.

[0031] After the carbonization reaction, the weight increase (that is, the absorption of carbon dioxide) is about 13%, the flexural strength of the specimen is 5.3MPa, and the compressive strength is 51MPa.

Embodiment 3

[0033] Select steel slag, activated magnesium oxide (same as embodiment 1) and cement (same as embodiment 1) for use as main raw materials. The CaO content in steel slag is 42%, and the MgO content is 11%. In terms of mass percentage, steel slag accounts for 80%, active magnesium oxide accounts for 10%, and cement accounts for 10%. Mix the above three raw materials evenly, add water, stir to make a uniform slurry, and cast a 40×40×40mm test piece. Using CO 2 Conservation, CO 2 The concentration is 99.9%, the pressure is 2.0MPa, the carbonization temperature is 50°C, and the reaction takes 3 hours.

[0034] After the carbonization reaction, the weight increase (that is, the absorption of carbon dioxide) is about 16%, the flexural strength of the specimen is 5.9MPa, and the compressive strength is 57MPa.

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Abstract

The invention discloses a calcium-magnesium carbonate gel material and a preparation method thereof. The gel material is prepared from the following components in percentage by mass: not smaller than 60% and not greater than 100% of industrial alkaline wastes, not smaller than 0 and not greater than 20% of cement and not smaller than 0 and not greater than 20% of active magnesium oxide through CO2 carbonization. According to the calcium-magnesium carbonate gel material and the preparation method thereof disclosed by the invention, a great deal of solid wastes is utilized, so that the calcium-magnesium carbonate gel material is environmentally friendly, low in cost, excellent in breaking strength and compressive strength; and the greenhouse gas CO2 is recycled to promote the energy conservation and emission reduction in the building material industry.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a magnesium-calcium carbonate gelling material and a preparation method thereof. Background technique [0002] reduce CO 2 Greenhouse gas emissions and curbing global warming are the focus of attention in the world today. Cement is the main gelling ingredient in the preparation of traditional concrete materials, and its production process CO 2 The emission is large, about 0.7-0.8tCO is emitted per 1t of cement clinker produced 2 . Cement industry CO 2 emissions from human activities account for about 2 5%-7% of the total amount. my country's cement output reached 2.4 billion tons in 2013, ranking first in the world for 27 consecutive years. Obviously, my country's cement industry CO 2 The situation of emission reduction is even more severe. With the continuous development of the economy and society, the demand for cement concrete will continue to i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B9/12
Inventor 莫立武邓敏张丰
Owner 苏州博纽强新材料科技有限公司
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