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Conductive aggregate preparation method and application thereof

An aggregate and fine aggregate technology, which is applied in the preparation of conductive aggregates and the application of smart cement-based composite materials, can solve the problems of carbon-based nanomaterials, such as difficulty in dispersing

Active Publication Date: 2022-05-10
HARBIN INST OF TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the above-mentioned direct introduction of carbon-based nanomaterials is difficult to disperse in the cement matrix, and the developed intelligent cement-based composite materials are usually at the expense of work performance and mechanical properties, and provide a conductive Preparation method of aggregate and intelligent cement-based composite material based on nano-interface modification

Method used

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  • Conductive aggregate preparation method and application thereof
  • Conductive aggregate preparation method and application thereof
  • Conductive aggregate preparation method and application thereof

Examples

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no. 1 example

[0043] A method for preparing a self-inductive cement-based composite material modified by conductive aggregate and nano-interface in this embodiment, comprising:

[0044] Put the GO solution and the surface-grafted calcium ion fine aggregate in a wide-mouthed aluminum basin at a volume ratio of 1:1.2, first manually stir for 3 minutes, and then place it under heating at 80°C, and continue stirring with a stirrer at a speed of 50 rpm for 2 hours. Make GO uniformly adsorbed on the surface of fine aggregate particles; then dry the fine aggregate with adsorbed graphene oxide in an oven at 60°C for 48 hours, and finally obtain fine aggregate with graphene oxide evenly wrapped on the surface;

[0045] Put the fine aggregate coated with graphene oxide on the surface in a muffle furnace for high temperature pre-reduction at 200°C for 1 hour; then, place the reduced graphene oxide fine aggregate obtained after high-temperature pre-reduction treatment in a microwave oven (power set to 8...

no. 2 example

[0054] The preparation method of a conductive aggregate and nano-interface modified self-induction cement-based composite material of this embodiment is different from that of Embodiment 1. In this embodiment, the volume ratio of the GO solution and the surface-grafted calcium ion to the fine aggregate is 1:1.5; the mixture was continuously stirred with a stirrer at a speed of 80rpm for 2h, so that GO was evenly adsorbed on the surface of fine aggregate particles; then the fine aggregate adsorbed graphene oxide was dried in an oven at 80°C for 48h, and finally the surface Fine aggregate that evenly wraps graphene oxide. The remaining steps are the same as in Embodiment 1.

no. 3 example

[0056] The preparation method of a conductive aggregate and nano-interface modified self-induction cement-based composite material of this embodiment is different from that of Embodiment 1. In this embodiment, the volume ratio of the GO solution and the surface-grafted calcium ion to the fine aggregate is It is 1:1.3. First, the mixture was hand-stirred for 2 minutes, then placed in a heating state at 90°C, and continuously stirred with a stirrer at a speed of 60 rpm for 1 hour, so that GO was evenly adsorbed on the surface of fine aggregate particles; The aggregates were dried in an oven at 60°C for 72 hours, and finally fine aggregates with graphene oxide uniformly coated on the surface were obtained. The remaining steps are the same as in Embodiment 1.

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Abstract

The invention discloses a preparation method and application of conductive aggregate, relates to the technical field of intelligent cement-based composite materials, and aims to solve the problems that direct introduction of a carbon-based nano material is difficult to disperse in a cement matrix, and the developed intelligent cement-based composite material is usually at the cost of sacrificing working performance and mechanical performance. The method comprises the following steps: grafting calcium ions to the surface of the fine aggregate, and then continuously mixing the fine aggregate with a graphene oxide solution under a heating condition to obtain the fine aggregate with the surface coated with graphene oxide; and carrying out high-temperature reduction treatment and microwave reduction treatment on the graphene oxide, and reducing the graphene oxide into graphene in situ to obtain the graphene-coated aggregate. And finally, mixing the conductive graphene aggregate, cement and water to form a stable conductive aggregate structure in the cement-based composite material. According to the prepared conductive cement-based composite material, the technical barrier that mechanical properties and electrical properties cannot be obtained at the same time is overcome under the condition that nano materials with extremely low doping amount are used. The method is applied to the field of conductive cement-based materials.

Description

technical field [0001] The invention relates to the technical field of intelligent cement-based composite materials, in particular to a method for preparing conductive aggregate and the application of intelligent cement-based composite materials based on nanometer interface modification. Background technique [0002] In recent decades, cement-based materials have gradually developed in the direction of intelligence, especially the transformation of cement-based materials, which were originally almost insulators, into semiconductors / conductors, which will endow them with multifunctionality and play a pivotal role in the field of modern civil engineering, such as , Conductive cement-based composite materials can be used for structural health monitoring, electric curing, electromagnetic shielding, road surface deicing / melting ice and snow, road weighing and traffic volume monitoring, etc. The above-mentioned multifunctional performance / intelligence characteristics of cement-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B20/04C04B20/02C04B14/06C04B28/04C04B111/94
CPCC04B20/1055C04B20/04C04B20/02C04B14/06C04B28/04C04B2111/94C04B2201/50C04B2103/302
Inventor 钟晶卢东
Owner HARBIN INST OF TECH
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