Photomagnetic coupling type self-healing concrete as well as preparation method and device thereof

A concrete and self-healing technology, applied in clay preparation devices, cement mixing devices, chemical instruments and methods, etc., can solve the problems of uncontrollable repair of concrete, dependence on external environment changes, etc., to improve self-healing ability and enhance Brownian the effect of exercise

Active Publication Date: 2022-08-09
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the traditional microcapsule repaired concrete is uncontrollable and completely dependent on the external environment, the present invention provides an optical-magnetic coupling self-healing concrete and a response device. The concrete is prepared by adding magnetic microcapsules and conductive Optical device, under the synergistic effect of light, heat and magnetic fields, enables the microcapsules to be broken in time and effectively, achieving the best repair effect

Method used

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  • Photomagnetic coupling type self-healing concrete as well as preparation method and device thereof
  • Photomagnetic coupling type self-healing concrete as well as preparation method and device thereof
  • Photomagnetic coupling type self-healing concrete as well as preparation method and device thereof

Examples

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Comparison scheme
Effect test

preparation example Construction

[0050] The technical scheme that the present invention solves the above-mentioned technical problems is as follows: a preparation method of opto-magnetic coupling type self-healing concrete, comprising the steps:

[0051] (1) Preparation of microcapsule wall material

[0052] Add urea and formaldehyde solution into the there-necked flask with a substance ratio of 1:2, after the urea is completely dissolved, adjust the pH of the solution to 8.0-9.0 with triethanolamine, and use 400-450 r / min under a constant temperature water bath at 70 °C. The mixture was stirred under reflux for 1 h to obtain a transparent and viscous urea-formaldehyde resin prepolymer.

[0053] Further, the n (urea):n (formaldehyde)=1:2 is for the purpose of generating dimethylol urea, the main component of the wall material, suppressing side reactions, and improving the productivity of effective reaction products.

[0054] (2) Preparation of magnetic core material emulsion

[0055] Weigh a certain amount ...

Embodiment 1

[0085] Example 1 Preparation of opto-magnetic coupled self-healing concrete

[0086] (1) Preparation of microcapsule wall material

[0087] Add 5 g of urea and 13.2 g of formaldehyde solution with a mass fraction of 38% into a 500 mL three-necked bottle. After all the urea is dissolved, adjust the pH of the solution to 8.0 to 9.0 with triethanolamine, and use 400 to The rotating speed of 450r / min was refluxed and stirred for 1 hour to obtain a transparent and viscous urea-formaldehyde resin prepolymer.

[0088] (2) Preparation of magnetic core material emulsion

[0089] Weigh 0.5g of black magnetic Fe 3 O 4 Nanoparticles, 0.5g composite emulsifier and 10g epoxy resin (E-51), add 200g deionized water, disperse on a high-speed dispersing homogenizer at a speed of 6000r / min for 30min to form an O / W type emulsion, the emulsification process Add 1 to 2 drops of n-octanol.

[0090] (3) Preparation of Magnetic Microcapsules

[0091] Mix the prepolymer and the core material emul...

Embodiment 2

[0095] Example 2 Performance comparison test

[0096] In the preparation method, the steps of adding magnetic materials and light guide devices are removed, and the remaining steps are the same as those in Example 1 to obtain traditional self-healing concrete; the steps of adding light guide devices are removed from the preparation method, and the remaining steps are the same as those in Example 1 to obtain magnetic self-healing concrete. Combined concrete. The traditional self-healing concrete, magnetic self-healing concrete, and opto-magnetic coupling self-healing concrete were tested for compressive strength, flexural strength, and repair rate respectively. The data obtained are shown in the following table:

[0097]

[0098] From the performance comparison data of traditional self-healing concrete, magnetic self-healing concrete and opto-magnetic coupling self-healing concrete, the analysis shows that:

[0099] a) The core material viscosity and compressive strength of...

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Abstract

The invention discloses optomagnetic coupling type self-healing concrete and a preparation method and device thereof, and belongs to the technical field of functional building materials.The optomagnetic coupling type self-healing concrete comprises a concrete base part, magnetic microcapsules and a light guide device, and the magnetic microcapsules are distributed in the concrete base part; the light guide device is fixed to the concrete base part in a pouring mode. The magnetic microcapsules and the light guide device are added to form the self-healing concrete, and the repair efficiency of internal damage of the concrete and the self-healing capacity of the concrete are greatly improved through coordinated response of a photo-thermal field and a magnetic field and Brownian movement.

Description

technical field [0001] The invention relates to the field of functional building materials, in particular to an opto-magnetic coupled self-healing concrete and a preparation method and device thereof. Background technique [0002] Traditional concrete has high brittleness and low tensile strength, and is prone to microscopic cracks. If it is not controlled, it may cause the collapse of buildings and threaten people's life and property safety. Scientists put forward the concept of self-healing concrete based on the phenomenon of skin wound healing. [0003] At present, there are six main methods of concrete self-healing / self-healing: microcapsule method, crystallization precipitation method, osmotic crystallization method, and microbial method. Since microcapsules have the function of protection and isolation, have little effect on the mechanical properties of concrete, and have stronger dispersibility, adding special materials can even improve the physical properties of con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00B28B23/00B28C5/00
CPCC04B28/00B28B23/0037B28C5/003C04B2111/343C04B24/307C04B24/2623C04B24/20C04B24/026C04B22/06C04B24/08C04B14/02C04B14/06Y02W30/91
Inventor 周晓锋张静娅屈梦玲高志伟裴昀李国柱
Owner HOHAI UNIV
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