Intelligent concrete containing multi-scale conductive materials and preparation method thereof

A conductive material and concrete technology, which is applied in the field of intelligent concrete and its preparation, can solve the problems of high cost of graphene and the decline of concrete mechanical properties, and achieve the effect of improving mechanical strength and fracture toughness

Inactive Publication Date: 2020-04-07
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of graphene is high, and when the amount is too large, it will cause a decline in the mechanical properties of concrete.

Method used

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  • Intelligent concrete containing multi-scale conductive materials and preparation method thereof
  • Intelligent concrete containing multi-scale conductive materials and preparation method thereof
  • Intelligent concrete containing multi-scale conductive materials and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] An intelligent concrete containing multi-scale conductive materials, consisting of the following components by weight: 450 parts of cement, 1350 parts of sand, 1600 parts of coarse aggregate, 350 parts of water, 14.4 parts of graphene, 14.4 parts of dispersant, carbon black 60 parts, steel fiber 120 parts.

[0028] The compressive strength of the prepared graphene concrete was 35.4MPa, and a cyclic pressure of 1-10MPa was applied to it, and the trend of its resistivity changing with the pressure was measured as follows: figure 1 shown.

Embodiment 2

[0030] An intelligent concrete containing multi-scale conductive materials, consisting of the following components by weight: 300 parts of cement, 1350 parts of sand, 0 parts of coarse aggregate, 270 parts of water, 28.8 parts of graphene, 20 parts of dispersant, carbon black 90 parts, steel fiber 40 parts.

[0031] The graphene concrete compressive strength that makes is 34.9Mpa, and it is applied the cycle pressure of 1-10Mpa, and the trend that its resistivity changes with pressure is measured as follows: figure 2 shown.

Embodiment 3

[0033] An intelligent concrete containing multi-scale conductive materials, consisting of the following components by weight: 450 parts of cement, 600 parts of sand, 1200 parts of coarse aggregate, 300 parts of water, 60 parts of graphene, 30 parts of dispersant, carbon black 60 parts, steel fiber 40 parts.

[0034] The graphene concrete compressive strength that makes is 30.4Mpa, and it is applied the cyclic pressure of 1-10Mpa, and the trend that its resistivity changes with pressure is measured as follows: image 3 shown.

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Abstract

The invention discloses a cement-based intelligent concrete material containing three-scale conductive materials graphene, carbon black and steel fiber. The preparation method of the cement-based intelligent concrete material includes the steps of: dissolving a dispersing agent in water, then adding graphene, placing the container in an ultrasonic generator to scatter graphene so as to obtain a uniform graphene turbid liquid; mixing cement and carbon black by a powder pneumatic mixer; mixing the steel fiber, sand and coarse aggregate in a concrete mixer till uniform, and adding the mixed cement and carbon black in the mixing process; and adding the graphene turbid liquid, and stirring the substances uniformly to obtain the mixed intelligent concrete. According to the method, electrodes arefirstly placed to a to-be-detected part of a structural member, then the well mixed graphene concrete is poured into a preset part, and the change of inter-electrode electrical resistivity is detected to represent the changes of the stress condition and damage condition of the concrete structural member, thus reaching the purpose of real-time detection of the stress and damage states of the concrete structure.

Description

technical field [0001] The invention relates to the field of building materials, in particular to an intelligent concrete containing multi-scale conductive materials and a preparation method thereof. Background technique [0002] The research on smart concrete can be traced back to the 1960s. It is often necessary to add conductive materials to concrete, such as carbon and metal, including carbon fiber, carbon black, metal powder, metal fiber, etc., to form smart concrete with self-sensing functions. , the resistivity of concrete changes with the pressure on the concrete. Generally speaking, with the increase of the doping amount of the conductive filler, the resistivity of the smart material decreases gradually. With the increase of pressure, the resistivity along the direction of pressure decreases gradually. Under tension, the resistivity along the direction of tension increases gradually. When cracks appear, the resistivity tends to increase suddenly. Graphene is a two...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B111/94
CPCC04B28/04C04B2111/94C04B14/06C04B22/02C04B14/024C04B14/022C04B14/48C04B2103/30C04B14/00
Inventor 黄炜王仕俊宋军杨德州詹伟张四江姜明军周毅明李毅平李伟王万吉刘钊尚建国祖金龙陈瑜红
Owner STATE GRID CORP OF CHINA
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