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Cement-based porous material based on silicon dioxide and preparation method of cement-based porous material based on silicon dioxide

A technology of silica and porous materials, applied in the field of building materials, can solve the problems of reduced mechanical properties of porous materials, weakening of mechanical properties of cement-based porous materials, etc., to increase the proportion of nanopores, which is conducive to the improvement of material strength and mechanical properties Effect

Active Publication Date: 2021-02-26
SOUTHWEAT UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0003] Introducing more pore structures into cement-based materials can achieve ultra-lightweight materials and further improve their thermal insulation performance, but at the same time, the introduction of pores will also lead to a significant weakening of the mechanical properties of cement-based porous materials, especially when the pore size is 0.1 μm The higher the pore content above, the mechanical properties of the porous material will decrease significantly

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  • Cement-based porous material based on silicon dioxide and preparation method of cement-based porous material based on silicon dioxide

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Embodiment 1

[0021] A cement-based porous material based on silica. The cement-based porous material is mainly a porous material obtained by mixing cement, admixture, water, admixture and silica dispersion liquid and then coagulating and hardening; wherein the water-cement ratio is 0.2-2, the amount of admixture is 0-30% of the mass of cement and admixture; the silica dispersion is a dispersion system formed by dispersing silica particles in water.

[0022] The specific operation steps of the preparation method of the silica-based cement-based porous material in this embodiment are as follows:

[0023] S1. Add silicon dioxide powder to water, use any one or more of mechanical stirring, ultrasonic dispersion, adding water reducing agent or adding surfactant to disperse silicon dioxide in water to form silicon dioxide Dispersions;

[0024] S2. Weigh cement, admixture, water, and admixture according to the ratio and stir them evenly to obtain a base material; Additive for cement and concret...

Embodiment 2

[0031] In this embodiment, the water-to-binder ratio is selected as 0.3, and the matrix material is prepared by stirring P.O 42.5 cement, water, and admixture (solid content 10%); the silicon dioxide powder is pre-dispersed in water for 5-60 minutes by ultrasonic waves to obtain a solid content of 30%. % silica dispersion liquid; then use the volume substitution method to design and calculate the mixed dosage of matrix material and silica dispersion liquid under different dry densities, and the proportioning ratio is shown in the following table 1:

[0032] Table 1 Mixing ratio of silica-based cement-based porous materials (kg / m 3 )

[0033] Numbering Design Dry Density cement water Admixture Silica Dispersion 1 1800 2000 585.6 16.00 0 2 1500 1100 322.1 8.80 295 3 1200 840 246.0 6.72 548 4 900 600 175.7 4.80 845 5 600 280 82.0 2.24 1151 6 400 90 26.4 0.72 1372

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Abstract

The invention relates to the technical field of building materials, and discloses a cement-based porous material based on silicon dioxide and a preparation method of the cement-based porous material based on silicon dioxide. The cement-based porous material is mainly obtained by mixing cement, an admixture, water, an additive and a silicon dioxide dispersion liquid and then condensing and hardening an obtained mixture, the silicon dioxide dispersion liquid is a dispersion system formed by dispersing silicon dioxide particles in water. Due to the fact that introduced water is not completely consumed in a cement hydration reaction, a large number of capillary pore spaces are formed, a cement hydration product and the surface of the spherical silicon dioxide are subjected to a volcanic ash reaction, the cement hydration product grows on the silicon dioxide and is in lap joint with the silicon dioxide, and therefore, the capillary pore spaces can be further divided; a large number of nanopore spaces are constructed in the capillary pore spaces, so that the proportion of nanopores in the cement composite porous material is increased; meanwhile, the capillary spaces are constructed through a nanopore structure, so that the microstructure of the material is strengthened, the development of the strength of the material is facilitated, and the mechanical property of the cement-based porous material is improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a silica-based cement-based porous material and a preparation method thereof. Background technique [0002] Cement-based porous materials have great potential as building thermal insulation materials due to their advantages of simple process, low cost, safety and fire prevention. A cement-based material with a rich pore structure prepared by entraining air inside to form pores or carrying a cell structure into the interior of the cement-based material through prefabricated foam, lightweight aggregate, etc. [0003] Introducing more pore structures into cement-based materials can achieve ultra-lightweight materials and further improve their thermal insulation performance, but at the same time, the introduction of pores will also lead to a significant weakening of the mechanical properties of cement-based porous materials, especially when the pore size is 0.1 μm The hig...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04C04B38/00C04B14/06
CPCC04B28/00C04B28/04C04B38/00C04B2201/20C04B2201/50C04B2201/52C04B18/141C04B18/08C04B18/146C04B2103/0068C04B20/0048C04B14/06C04B2103/302C04B2103/22C04B2103/12C04B38/0054C04B38/0067C04B38/0074Y02W30/91
Inventor 蒋俊李军卢忠远
Owner SOUTHWEAT UNIV OF SCI & TECH
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