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Nano-modified super-stable foam and application thereof in ultralight-density cement-based porous material

A nano-particle modification and foam technology is applied in the field of thermal insulation to achieve the effect of improving stability, good strength and good stability

Active Publication Date: 2017-06-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on improving foam stability

Method used

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  • Nano-modified super-stable foam and application thereof in ultralight-density cement-based porous material
  • Nano-modified super-stable foam and application thereof in ultralight-density cement-based porous material
  • Nano-modified super-stable foam and application thereof in ultralight-density cement-based porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1250

[0031] Example 1 250kg / m 3 dry density

[0032] Weigh raw materials according to the following weight: (kg)

[0033] Cement: 600, fly ash: 300, silica fume: 100, polycarboxylate superplasticizer: 5, water: 350, foaming agent: 40. The cement is Onoda P·Ⅱ52.5 cement, the fly ash is secondary fly ash, the silica fume is Elkem silica fume, and the water reducer is polycarboxylate water reducer produced by Jiangsu Subote New Material Co., Ltd. The water rate is 40%, and the composition of the blowing agent is mainly shown in Table 2.

[0034] The composition of table 2 embodiment 1 nano blowing agent

[0035]

[0036]

[0037] The preparation steps of the cement-based porous material modified by nanotechnology are:

[0038] 1) Add 0.5% nanoparticles to the sodium hydroxide solution and stir for 5 minutes, then add 0.3% dispersant and heat to 45°C and stir for 10 minutes. After the stirring is completed, perform ultrasonic treatment on the prepared suspension in an ultraso...

Embodiment 2

[0041] Example 2 200kg / m 3 dry density

[0042] Weigh raw materials according to the following weight: (kg)

[0043] Cement: 600, fly ash: 300, silica fume: 100, polycarboxylate superplasticizer: 5, water: 350, foaming agent: 50. The properties of the raw materials are as in Example 1, and the composition of the blowing agent is mainly shown in Table 3.

[0044] The composition of table 3 embodiment 2 nano blowing agent

[0045] serial number component name Mass % 1 nanoparticles 0.8 2 Dispersant 0.5 3 Surfactant A 1 4 Surfactant B 2.5 5 sodium hydroxide 0.07 6 Deionized water 94.73

[0046] The preparation steps are as in Example 1.

Embodiment 3

[0047] Example 3 150kg / m 3 dry density

[0048] Weigh raw materials according to the following weight: (kg)

[0049] Cement: 600, fly ash: 300, silica fume: 100, polycarboxylate superplasticizer: 5, water: 350, foaming agent: 60. Raw material properties are as in Example 1. The composition of the blowing agent is mainly shown in Table 4.

[0050] The composition of table 4 embodiment 3 nano blowing agent

[0051] serial number component name Mass % 1 nanoparticles 1 2 Dispersant 0.8 3 Surfactant A 2 4 Surfactant B 2 5 sodium hydroxide 0.09 6 Deionized water 93.61

[0052] The preparation steps are as in Example 1.

[0053] The bleeding rate of the foam prepared by the present invention is as follows figure 1 As shown, the shape of the bubble is as figure 2 shown.

[0054] Depend on figure 1 As shown, the stability of the air bubbles improved by nanoparticles is significantly improved, and the mass bleeding r...

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Abstract

The invention discloses nano-modified super-stable foam and application thereof in an ultralight-density cement-based porous material. By means of stably scattering nanoparticles into a foaming agent, foam can be wrapped by the nanoparticles after the modified foaming agent is stirred and generates the foam, the foam is converted into a gas-liquid-solid three-phase structure from a gas-liquid two-phase structure, and the stability of the foam is obviously improved. The foam prepared from the modified foaming agent has good stability and fine and uniform size; furthermore, the ultralight porous cement-based material prepared from the foam has high strength, is not prone to collapsing and solves the problems that a traditional ultralight cement-based porous material has poor performance and the like; the application of the foam is an effective method for improving performance of the ultralight cement-based material.

Description

technical field [0001] The invention relates to the field of cement-based porous materials, which are used for thermal insulation in the fields of house construction and the like. Specifically, the stability of the foam is improved by encapsulating the prefabricated foam with nanoparticles, thereby preparing an ultra-light cement-based porous material. Background technique [0002] The cement-based porous material is a kind of prefabricated foam that is uniformly mixed into the cement-based cementitious material slurry or mortar by mechanical stirring, and is formed by a pumping system for cast-in-place construction molds, and is formed by natural curing. Lightweight thermal insulation material with closed pores. This cement-based material has a large number of closed, uniform and fine pores inside. It has a series of advantages such as light weight, good construction, thermal insulation, fire resistance and energy absorption. It is widely used in roof and wall insulation. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B38/10C04B28/04C04B103/42
CPCC04B28/04C04B38/106C04B40/0039C04B2103/42C04B2201/20C04B2201/32C04B2201/50C04B22/062C04B14/062C04B24/32C04B2103/40C04B18/08C04B18/146C04B2103/302
Inventor 佘伟杜仪张云升蒋金洋
Owner SOUTHEAST UNIV
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