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Bionic cement with oriented porous structure and preparation method thereof

A porous structure and cement technology, which is applied in the field of porous cement, can solve the problems of multiple preparation processes, prolong the production cycle, and complex processes, and achieve the effects of simple and easy-to-obtain raw materials, excellent comprehensive performance, and low preparation cost

Active Publication Date: 2019-01-29
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The analysis of the existing method of preparing porous cement based on freeze casting technology shows that although the pores in the cement can be preferentially arranged according to a certain orientation, the preparation process is many, the process is long, and the process is complicated, especially the frozen cement produced by freeze casting. The slurry needs to be vacuum freeze-dried to obtain the cement green body. This step is not only inefficient and time-consuming, but also consumes a lot of energy, which cannot meet the requirements of energy conservation and environmental protection. At the same time, it imposes strict restrictions on the size of the prepared cement green body. It is difficult to produce large-scale porous cement, and significantly increases the preparation cost of porous cement, so it is very unsuitable for large-scale industrial production
In addition, since the moisture in the cement body is removed due to the freeze-drying process, the subsequent maintenance of porous cement needs to reapply water, which not only increases the preparation process of porous cement and prolongs its production cycle, but also affects the curing process of porous cement. Reduces the strength and stiffness of the resulting porous cement

Method used

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  • Bionic cement with oriented porous structure and preparation method thereof
  • Bionic cement with oriented porous structure and preparation method thereof
  • Bionic cement with oriented porous structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, the biomimetic cement with a directional porous structure was prepared by using a slurry with a mass ratio of water to cement powder of 0.4. The raw materials used include ordinary Portland cement powder (the fineness is 80 microns, the sieve residue is 0.9 wt%, and the specific surface area is 342m 2 / kg), water and polycarboxylate high-performance water reducer, the specific preparation process is as follows:

[0034] 1) Slurry preparation

[0035] Weigh 750g of ordinary Portland cement powder, 300g of water and 3g of DH-4005 polycarboxylate high-performance water reducer, add them into a 1000mL plastic jar and perform mechanical stirring at a stirring rate of 100rpm. The time is 30 minutes to obtain uniformly dispersed cement slurry.

[0036] 2) Freeze casting

[0037] Pour the evenly stirred slurry into a cuboid polymethyl methacrylate mold with an inner cavity size of 30mm×30mm×70mm. The lower end of the mold is sealed with a polydimethylsiloxan...

Embodiment 2

[0042] In this example, the biomimetic cement with a directional porous structure was prepared by using a slurry with a mass ratio of water to cement powder of 0.7. Used raw material is identical with embodiment 1, and concrete preparation process is as follows:

[0043] 1) Slurry preparation

[0044] Weigh 400g of ordinary Portland cement powder, 280g of water and 1g of DH-4005 polycarboxylate high-performance water reducer, add them to a 1000mL plastic jar, and add 3mm, 6mm in diameter to the bottle , 6 zirconia grinding balls of 10mm and 12mm respectively, after the bottle cap is sealed on the jar cap, be placed on the roller type ball mill and carry out ball milling. The ball milling speed was 150 rpm, the ball milling time was 10 min, and the mass ratio of the balls to the slurry was 0.5 to obtain uniformly dispersed cement slurry.

[0045] 2) Freeze casting

[0046] The difference between this step and step 2) in Example 1 is that the cooling medium of the copper rod ...

Embodiment 3

[0051] In this embodiment, the biomimetic cement with directional porous structure is prepared by using the slurry with the mass ratio of water to cement powder of 1.1. The raw materials used include fly ash Portland cement powder (fineness is 80 microns, sieve residue 1.6wt%, specific surface area 315m 2 / kg), water and hydroxypropyl methylcellulose powder (average particle size 180 μm), the specific preparation process is as follows:

[0052] 1) Slurry preparation

[0053] Weigh 333.3g of ordinary Portland cement powder, 300g of water and 1.3g of hydroxypropyl methylcellulose powder, and add them into a 1000mL plastic jar for mechanical stirring. The stirring rate is 30rpm and the stirring time is 1h. , to obtain a uniformly dispersed cement paste.

[0054] 2) Freeze casting

[0055] This step operation is identical with step 2) in embodiment 1.

[0056] 3) Body maintenance

[0057] The solidified cement slurry was removed from the copper plate and placed in an environm...

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Abstract

The invention relates to the field of porous cement, specifically to a bionic cement with an oriented porous structure and mainly used as a building material, and a preparation method thereof. The bionic cement has a porous structure with a porosity of 10% to 90%, a pore diameter of 0.5 [mu]m to 500 [mu]m and pore channels preferentially aligned in a specific direction. The preparation method forthe cement comprises three steps, i.e., slurry preparation, freeze-casting and green body maintenance, wherein the mass ratio of water to cement powder in a slurry is 0.25 to 3. The bionic cement provided by the invention has excellent performances like light weight, high specific strength and specific rigidity, heat preservation and insulation, noise insulation and reduction, fire prevention andinsusceptibility to cracking, specifically has good water permeability, air permeability and mechanical properties along a pore channel direction, and can be effectively controlled in performances through adjustment of a slurry proportion and a preparation process. The preparation method for the bionic cement provided by the invention has the advantages of simple process, short flow, low cost, energy conservation, environmental protection, and applicability to large-scale production.

Description

technical field [0001] The invention relates to the field of porous cement, in particular to a biomimetic cement with a directional porous structure mainly used as building materials and a preparation method thereof. Background technique [0002] With the gradual rise of high-rise, large-scale and modern buildings, on the premise of meeting the mechanical properties required for safe service, the development of new building materials that are lightweight, heat-preserving, crack-proof, and sound-proof is crucial to the realization of building safety, High efficiency, energy saving and lightweight design are of great significance. For example, compared with traditional wall materials, cement foam bricks have excellent properties such as light weight, thermal insulation, and sound insulation due to their porous structure. It is widely used as a non-load-bearing wall brick). In addition, with the development of my country's economic society and urban-rural integration process,...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B38/00
CPCC04B28/04C04B24/24C04B38/0074C04B38/0054
Inventor 刘增乾王法衡张哲峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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