Cement-based material and preparation method thereof

A cement-based material, cement technology, applied in the field of concrete maintenance, can solve problems such as high cost and difficult operation, and achieve the effects of increasing carbonation rate, increasing solubility, broad market prospects and economic value

Pending Publication Date: 2021-10-29
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have problems such as difficult operation and high cost.

Method used

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  • Cement-based material and preparation method thereof
  • Cement-based material and preparation method thereof

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[0027] One embodiment of the present invention proposes a method for preparing cement-based materials, which includes: mixing the raw materials of cement-based materials, adding amine admixtures during the raw material mixing process, adding water and mixing to shape, performing high-temperature pretreatment and CO 2 Mineralization maintenance; wherein, the added amount of the amine admixture is 0.01‰~2‰ of the cement mass in the raw material.

[0028] When the addition amount of amine admixture is less than 0.01‰, the expected effect cannot be achieved due to the addition of too little amine admixture, and the addition of too much amine admixture may easily cause the strength of the cement-based material to shrink, affecting the performance and performance of the product. Durability, while also increasing production costs.

[0029] In the embodiments of the present invention, by adding amine admixtures, preferably alcohol amines, the depth of carbon dioxide mineralization and...

Embodiment 1

[0047] (1) Take 100kg of benchmark cement, add 10g of triethanolamine (mass ratio 0.1‰), and mix at a water-cement ratio of 0.4 to prepare a cement slurry test block; take the same batch of cement and make a blank test block at the same water-cement ratio;

[0048] (2) Place the formed clean pulp test block in an air atmosphere, and pretreat it at a temperature of 120°C for 30 minutes;

[0049] (3) Place the test block obtained in step (2) in CO 2 In the mineralized curing atmosphere, the curing pressure is 0.2MPa, CO 2 The partial pressure is 80%, and it is cured for 4 hours in the temperature range of 40°C to 50°C.

[0050] After testing, the carbonization rate and compressive strength of the cement slurry test block and the blank test block in Example 1 are shown in Table 1.

[0051] Table 1 Carbonization rate and compressive strength

[0052] Carbonization rate / % Compressive strength / MPa Example 1 30 47 blank test block 24 39

Embodiment 2

[0054] (1) Take 100kg of benchmark cement, add 30g of triisopropanolamine (mass ratio 0.3‰), and mix at a water-cement ratio of 0.35 to prepare a cement slurry test block; take the same batch of cement and use the same water-cement ratio as a blank test block ;

[0055] (2) Place the formed clean pulp test block in an air atmosphere, and pretreat it at a temperature of 130°C for 20 minutes;

[0056] (3) Place the test block obtained in step (2) in CO 2 In the mineralized curing atmosphere, the curing pressure is 0.3MPa, CO 2 The partial pressure is 90%, and the curing time is 2 hours in the temperature range of 50°C to 60°C.

[0057] After testing, the carbonization rate and compressive strength of the cement paste test block and the blank test block in Example 2 are shown in Table 2.

[0058] Table 2 carbonization rate and compressive strength

[0059] Carbonization rate / % Compressive strength / MPa Example 2 28.5 45.8 blank test block 23.6 42.9 ...

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Abstract

The invention relates to a cement-based material and a preparation method thereof. The preparation method of the cement-based material comprises the following steps: mixing raw materials of the cement-based material, adding an amine admixture in the mixing process of the raw materials, adding water, conducting stirring and forming, and carrying out high-temperature pretreatment and CO2 mineralization maintenance, wherein the addition amount of the amine admixture is 0.01-0.2% of the mass of the cement in the raw materials. According to the invention, the amine admixture is added in the raw material mixing process, so the internal microporous structure of the cement-based material can be adjusted, the CO2 solubility and the calcium and magnesium ion dissolution rate of the material can be improved, the depth of CO2 carbonization reaction can be effectively improved, the CO2 carbonization rate in the cement-based material can be improved, and good energy-saving and carbon-reducing effects can be achieved. The carbonization rate of the cement-based material obtained by the method disclosed by the invention is 28-35%.

Description

technical field [0001] The invention relates to the technical field of concrete maintenance, in particular to a cement-based material and a preparation method thereof. Background technique [0002] CO 2 Mineralization maintenance technology utilizes the early-formed concrete material and CO 2 The carbonation reaction and product deposition process between the carbonation reaction and the product deposition process can improve the mechanical strength of the product, and the main focus is on the cementitious components and CO in the concrete after pretreatment / early hydration 2 Between mineralization and curing (that is, accelerated carbonation), the hydration process of the cementitious material is no longer the main reaction for the formation of strength during this process. [0003] Calcium silicate energy and CO 2 Rapid response and high strength in a short period of time, in theory, Portland cement with CO 2 CO after complete reaction 2 The consumption can reach abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/02C04B28/00C04B28/04C04B24/12
CPCC04B40/0263C04B40/0231C04B28/00C04B28/04C04B24/122C04B24/128C04B24/121C04B2201/50
Inventor 房晶瑞郅晓刘进强刘姚君孙勇石信超
Owner CHINA BUILDING MATERIALS ACAD
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