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Method for enabling cement or concrete to have wave absorbing performance and dense surface by using silicon dioxide (SiO2) coated magnetic nanoparticles

A technology of magnetic nanoparticles and concrete surface, which is applied in the surface wave absorbing modification of cement and concrete. Cement or concrete has wave absorbing performance and compact surface field, and achieves the effect of strong magnetism, suitable for mass production and application, and small size.

Active Publication Date: 2015-05-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Nano-SiO has not yet been 2 It is used in combination with ferrite to treat the surface of cement or concrete to improve its structure and performance at the same time.

Method used

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  • Method for enabling cement or concrete to have wave absorbing performance and dense surface by using silicon dioxide (SiO2) coated magnetic nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 0.1 g of Fe synthesized by co-precipitation method 3 o 4 Disperse nanoparticles in 20mL water, add 20mL ethanol and 0.1mL tetraethyl orthosilicate and mix evenly, then add 0.1mL ammonia water with a concentration of 20%, and stir at 15°C for 6h to prepare MFe 2 o 4 / SiO 2 Water dispersion: spray the water dispersion containing nanoparticles on the concrete test block under the magnetic field as the driving force. After testing, the surface hardness of the concrete has been significantly enhanced, and the reflectivity has been significantly reduced, showing good wave absorption. performance.

Embodiment 2

[0028] 0.1 g of Fe synthesized by co-precipitation method 3 o 4 Disperse nanoparticles in 30mL water, add 80mL ethanol and 0.2mL tetraethyl orthosilicate and mix evenly, then add 0.15mL ammonia water with a concentration of 23%, and stir at 30°C for 6h to obtain MFe 2 o 4 / SiO 2 Water dispersion liquid; under the magnetic field as the driving force, the solution containing nanoparticles is sprayed on the concrete test block. After testing, the surface hardness of the concrete is enhanced and it has wave-absorbing properties.

Embodiment 3

[0030] 0.1 g of Fe synthesized by co-precipitation method 3 o 4Disperse nanoparticles in 40mL water, add 100mL ethanol and 0.2mL tetraethyl orthosilicate and mix evenly, then add 0.2mL ammonia water with a concentration of 25%, and stir at 50°C for 6h to obtain MFe 2 o 4 / SiO 2 Water dispersion liquid; the solution containing nanoparticles is painted on the concrete test block under the magnetic field as the driving force. After testing, the surface hardness of the concrete is enhanced and it has wave-absorbing properties.

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Abstract

The invention provides a method for enabling cement or concrete to have wave absorbing performance and a dense surface by using silicon dioxide (SiO2) coated magnetic nanoparticles. According to the method, in the presence of an externally applied magnetic field, the SiO2 coated magnetic nanoparticles are enabled to penetrate to formed cement and concrete, surfaces are enabled to be hardened, and surface layers with wave absorbing performance are formed; the SiO2 coated magnetic nanoparticles, namely MFe2O4 / SiO2 nanoparticles, are of core / shell structures, are prepared by a Stober method, are relatively small in particle size and relatively strong in magnetic properties and can fully penetrate into the surface and interior of cement and concrete; by using MFe2O4 nanoparticles and SiO2 in a composite manner, the surface of cement and concrete can be hardened and can have wave absorbing performance. The method provided by the invention can be used for carrying out surface treatment on formed cement, concrete materials or existing buildings so as to form the surface layers with wave absorbing performance, is simple in process and low in cost and is applicable to mass production and application.

Description

technical field [0001] The invention belongs to the technical field of cement and concrete, and relates to a surface wave-absorbing modification technology of cement and concrete, in particular to a method for coating magnetic nanoparticles with silicon dioxide to make cement or concrete have wave-absorbing properties and a compact surface. Background technique [0002] Nano silicon dioxide (SiO 2 ) has high activity and can be combined with cement hydration product Ca(OH) in a large amount 2 The reaction forms a gel, which improves the internal structure of cement and concrete, and increases its strength and durability. There are currently many studies on nano-SiO 2 The research on the effect of the addition of ions on the cement concrete structure, such as the title of "Nano" SiO2 in the "New Building Materials" magazine 2 Effects on the properties of cement facing mortar" reported that the addition of an appropriate amount of nano-SiO 2 It can improve the mechanical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/50
Inventor 程新王丹杨萍
Owner UNIV OF JINAN
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