Ultrahigh-sensitivity pressure-sensitive cement-based composite material as well as preparation method and application thereof

A composite material and cement-based technology, which is applied in the field of building materials, can solve the problems of affected mechanical properties and insignificant improvement of pressure-sensitive properties, and achieve improved pressure-sensitive properties, improved pressure-sensitive properties and mechanical properties, and a large resistance change rate Effect

Inactive Publication Date: 2019-12-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In view of the problems that the pressure-sensitive properties of the existing cement-based composite materials for structural health monitoring are not significantly improved and the mechanical properties are affected due to the poor dispersion of carbon nanotubes, the present invention provides an ultra-high sensitivity pressure-sensitive cement In addition, the present invention also provides an application of the ultra-high-sensitivity pressure-sensitive cement-based composite material for structural health monitoring

Method used

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  • Ultrahigh-sensitivity pressure-sensitive cement-based composite material as well as preparation method and application thereof
  • Ultrahigh-sensitivity pressure-sensitive cement-based composite material as well as preparation method and application thereof
  • Ultrahigh-sensitivity pressure-sensitive cement-based composite material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0029] An ultra-high-sensitivity pressure-sensitive cement-based composite material, which is composed of the following raw materials in parts by weight: 95 parts of cement, 5 parts of fly ash for growing carbon nanotubes in situ, 40 parts of water, 200 parts of sand, and 0.5 parts of water reducer share. In the fly ash with carbon nanotubes grown in situ, the mass percentage of carbon nanotubes is 0.2%.

[0030] Wherein, the preparation steps of the fly ash with carbon nanotubes grown in situ on the surface are as follows:

[0031] A. Synthesis of fly ash-based conductive material

[0032] Add fly ash to dilute hydrochloric acid, then add monomer pyrrole, stir evenly, then add oxidant ammonium persulfate, continue stirring until black matter is formed, use hydrochloric acid and acetone with a concentration of 1mol / L to wash the black matter several times, and then Vacuum-dry the black substance at 50°C to constant weight to obtain a fly ash-based conductive substance, where...

Embodiment 2

[0041] An ultra-high-sensitivity pressure-sensitive cement-based composite material, which is composed of the following raw materials in parts by weight: 85 parts of cement, 15 parts of fly ash for growing carbon nanotubes in situ, 50 parts of water, 300 parts of sand, and 1 part of water reducer share. In the fly ash with carbon nanotubes grown in situ, the mass percentage of carbon nanotubes is 10%.

[0042] Wherein, the preparation steps of the fly ash with carbon nanotubes grown in situ on the surface are as follows:

[0043] A. Synthesis of fly ash-based conductive material

[0044] Add fly ash to dilute hydrochloric acid, then add monomer pyrrole, stir evenly, then add oxidant ammonium persulfate, continue stirring until black matter is formed, use hydrochloric acid and acetone with a concentration of 2mol / L to wash the black matter several times, and then Vacuum-dry the black substance at 60°C to constant weight to obtain a fly ash-based conductive substance, wherein ...

Embodiment 3

[0049] An ultra-high-sensitivity pressure-sensitive cement-based composite material is composed of the following raw materials in parts by weight: 80 parts of cement, 20 parts of fly ash for growing carbon nanotubes in situ, 60 parts of water, 300 parts of sand, and 1.5 parts of water reducer share. In the fly ash with carbon nanotubes grown in situ, the mass percentage of carbon nanotubes is 5%.

[0050] Wherein, the preparation steps of the fly ash with carbon nanotubes grown in situ on the surface are as follows:

[0051] A. Synthesis of fly ash-based conductive material

[0052] Add fly ash to dilute hydrochloric acid, then add monomer imide, stir evenly, then add oxidant ferric chloride, continue stirring until black matter is formed, use hydrochloric acid and acetone with a concentration of 7mol / L to wash the black matter several times, Then vacuum-dry the black substance at 70°C to a constant weight to obtain a fly ash-based conductive substance, wherein the molar rat...

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Abstract

The invention discloses an ultrahigh-sensitivity pressure-sensitive cement-based composite material as well as a preparation method and application thereof. The pressure-sensitive cement-based composite material comprises the following raw materials in parts by weight: 75-95 parts of cement, 5-25 parts of a mineral admixture for in-situ growth of carbon nanotubes, 0.1-3 parts of a water reducing agent, 100-300 parts of sand and 30-60 parts of water. The preparation method comprises the steps: firstly, uniformly dispersing the mineral admixture for in-situ growth of the carbon nanotubes in water; then blending cement and sand firstly, then adding the dispersed mineral admixture for in-situ growth of the carbon nanotubes and the water reducing agent, and blending; and finally, molding the blend material, and curing to obtain the product. The mineral admixture is used as a carrier, the carbon nanotubes grow on the surface of the mineral admixture in situ, and the carbon nanotubes is uniformly dispersed in the cement matrix by virtue of the characteristic that the mineral admixture is easy to disperse in the cement matrix, so that the pressure-sensitive property and mechanical propertyof the cement-based composite material are improved. Therefore, the ultrahigh-sensitivity pressure-sensitive cement-based composite material can be used for structural health monitoring.

Description

technical field [0001] The invention relates to an ultra-high-sensitivity pressure-sensitive cement-based composite material and its preparation method and application, belonging to the technical field of building materials. Background technique [0002] In the field of civil engineering, cement-based composites are the most common engineering materials. As the largest structural material, cement-based composite materials are gradually developing from traditional structural materials with only load-bearing capacity to sustainable, super-composite, super-durable, high-strength, high-performance, high-function, and intelligent. However, as a cement-based composite material whose main characteristic is bearing capacity, its tensile strength is low and its toughness is poor, and a large number of cracks often occur in engineering, which seriously affects the durability and safety of the structure. [0003] Therefore, structural health monitoring is often introduced in important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04G01B7/16
CPCC04B28/04C04B2111/00008C04B2201/50G01B7/18C04B14/026C04B18/08C04B2103/302C04B14/06C04B14/068
Inventor 潘钢华展咪咪周飞飞
Owner SOUTHEAST UNIV
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