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Conductive cement-based composite material and its preparation method and application

A composite material and conductive cement technology, applied in the field of building materials, can solve the problems of difficult dispersion of carbon nanotubes and nano-carbon black, and the weakening of large-volume nano-carbon black, and achieve good compactness, stable pressure sensitivity, and compatibility good sex effect

Active Publication Date: 2017-08-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that carbon nanotubes and nano-carbon black are not easy to disperse in cement slurry, and the mechanical properties of cement-based composite materials are weakened by a large amount of nano-carbon black, and provide an easy-to-disperse, low-amount, conductive and Conductive cement-based composites with good pressure sensitivity

Method used

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  • Conductive cement-based composite material and its preparation method and application
  • Conductive cement-based composite material and its preparation method and application
  • Conductive cement-based composite material and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The only difference between the raw material and the comparative example is that 0.5 parts of electrostatic self-assembled carbon nanotubes / nanocarbon black are added.

[0058] The difference between the preparation method and the comparative example is that when the cement and fly ash are added, slowly add the electrostatic self-assembled carbon nanotubes / nanocarbon black while stirring slowly, and then stir quickly after adding, and the other steps are the same as the comparative example .

[0059] Static resistivity, resistivity change rate and sensitivity of table 4 embodiment 1 specimen

[0060]

Embodiment 2

[0062] The only difference between the raw material and Example 1 is that the amount of electrostatically self-assembled carbon nanotubes / nanocarbon black is 1 part.

[0063] The preparation method is the same as in Example 1.

[0064] Static resistivity, resistivity change rate and sensitivity of table 5 embodiment 2 test pieces

[0065]

Embodiment 3

[0067] The only difference between the raw material and Example 1 is that the amount of electrostatically self-assembled carbon nanotubes / nanocarbon black is 2 parts.

[0068] The preparation method is the same as in Example 1.

[0069] Static resistivity, resistivity change rate and sensitivity of table 6 embodiment 3 test pieces

[0070]

[0071]

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PUM

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Abstract

The invention discloses a conductive cement based composite material, a preparation method thereof and application thereof. The raw material comprises following components: 40-60 parts by mass of cement, 8-15 parts by mass of fly ash, 25-35 parts by mass of water, 0-2 parts by mass of water reducing agent and 0.5-7 parts by mass of electrostatic self-assembly carbon nano tubes / nano carbon black. The preparation method comprises following steps of taking the raw materials comprising the above parts of by mass of components; successively adding and stirring water, water reducing agent, cement, electrostatic self-assembly carbon nano tubes / nano carbon black in a cement paste mixer to obtain mixture; pouring the mixture into a die, inserting the die into an electrode used for connecting an external circuit and arranging, vibrating and smoothing the die on a vibration platform; putting and curing the die into a curing box with the temperature of 20 DEG C and relative humidity of 95% for 24-36 hours and then performing demoulding. Compared with the prior art, the composite material is advantaged by simple and convenient preparation technique, high compactness, small static electrical resistivity, stable compression sensitivity, high sensitivity, high durability and high compatibility.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a cement-based composite material, in particular to a conductive cement-based composite material and its preparation method and application. Background technique [0002] Due to environmental conditions such as external loads and corrosion, material aging and fatigue, concrete structures such as bridges and house buildings are prone to failure during service, threatening people's lives and property. Structural health monitoring technology can realize the evaluation of structural performance through real-time monitoring of steel corrosion rate, water content, pH value, acceleration, stress, strain and cracks. The sensors currently used in concrete structure health monitoring mainly include resistance strain gauges, optical fiber sensors, piezoelectric ceramics, and shape memory alloys. However, these sensors have disadvantages such as poor durability, low sensitivity, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/18
Inventor 韩宝国王云洋张立卿欧进萍
Owner DALIAN UNIV OF TECH
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