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Cement-based intelligent composite material strain sensor and preparation method thereof

A strain sensor and composite material technology, applied in the field of sensors, can solve the problems of poor electrical performance and reduced sensor strength, and achieve the effects of improving interface bonding, avoiding poor electrical performance, and avoiding strength reduction

Active Publication Date: 2012-06-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a cement-based intelligent composite material strain sensor and its preparation method. The strain sensor has the characteristics of high sensitivity coefficient, high linearity of pressure-sensitive characteristics, and excellent mechanical properties of the sensor. , the preparation process adopts a dry mixing process, which avoids the problems of sensor strength reduction and electrical performance deterioration caused by the use of cellulose, and there is no fiber agglomeration

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  • Cement-based intelligent composite material strain sensor and preparation method thereof
  • Cement-based intelligent composite material strain sensor and preparation method thereof
  • Cement-based intelligent composite material strain sensor and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] refer to figure 1 , figure 2 , a cement-based intelligent composite material strain sensor, composed of carbon fiber cement basic intelligent composite material and four parallel high-purity copper mesh electrodes arranged on the composite material, the aperture of the high-purity copper mesh is greater than 2mm, and the composite material is The mixture of PAN-based chopped carbon fiber and Portland cement with a mass ratio of 0.001:1, and the shape of the strain sensor is a cuboid.

[0037] Its preparation process is as follows:

[0038] First, prepare a steel mold with a cuboid cavity, and fix four high-purity copper meshes perpendicular to the longest side of the cuboid, parallel and symmetrical to each other in the mold.

[0039] Then, according to the mass ratio of 0.001:1, take PAN-based chopped carbon fiber and Portland cement, and use a high-speed mixer with crossed rubber blades to disperse the PAN-based chopped carbon fiber into a monofilament state, and t...

Embodiment 2

[0045] refer to figure 1 , figure 2 , a cement-based intelligent composite material strain sensor, composed of carbon fiber cement basic intelligent composite material and four parallel high-purity copper mesh electrodes arranged on the composite material, the aperture of the high-purity copper mesh is greater than 2mm, the composite material mainly It is composed of PAN-based chopped carbon fiber with a mass ratio of 0.004:1:0.5, Portland cement mixture and aggregate. The aggregate is quartz sand or a mixture of quartz sand with reasonable gradation in various particle size ranges. The shape of the strain sensor is cuboid.

[0046] Its preparation process is as follows:

[0047] First, prepare a steel mold with a cuboid cavity, and fix four high-purity copper meshes perpendicular to the longest side of the cuboid, parallel and symmetrical to each other in the mold.

[0048] Then, according to the mass ratio of 0.004:1:0.5, take PAN-based chopped carbon fiber, portland cem...

Embodiment 3

[0054] refer to figure 1 , image 3 , a cement-based intelligent composite material strain sensor, composed of carbon fiber cement basic intelligent composite material and four parallel high-purity copper mesh electrodes arranged on the composite material, the aperture of the high-purity copper mesh is greater than 2mm, and the composite material is The mixture of PAN-based chopped carbon fiber and Portland cement with a mass ratio of 0.006:1, and the shape of the strain sensor is a cylinder.

[0055] Its preparation process is as follows:

[0056] First, prepare a steel mold with a cylindrical cavity, and fix four pieces of high-purity copper mesh perpendicular to the generatrix of the cylinder, parallel and symmetrical to each other in the mold.

[0057] Then, according to the mass ratio of 0.006:1, take PAN-based chopped carbon fiber and Portland cement, and use a high-speed mixer with crossed rubber blades to disperse the PAN-based chopped carbon fiber into a monofilamen...

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Abstract

The invention discloses a cement-based intelligent composite material strain sensor, which comprises a carbon-fiber cement-based intrinsic intelligent composite material and four parallel electrodes arranged on the composite material, wherein the electrodes are high-purity copper meshes; the pore diameter of the high-purity copper meshes is larger than 2mm; and the main ingredients of the composite material are PAN-based short-cut carbon fiber and silicate cement, and the electrodes are combined together with the carbon-fiber cement-based intrinsic intelligent composite material by an embedding process. The cement-based intelligent composite material strain sensor has the characteristics of high sensitivity coefficient, high voltage-sensitive characteristic linearity and excellent mechanical property; and the preparation process adopts a drying and mixing process, so that the problems that due to use of cellulose, the strength of the sensor is reduced and the electric performance of the sensor becomes poor are avoided and no phenomenon of fiber agglomeration occurs.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a cement-based intelligent composite material strain sensor and a preparation method thereof. The strain sensor is used for strain monitoring of civil engineering concrete structures. Background technique [0002] At present, in civil engineering structures, resistance strain gauges are widely used to monitor the strain of concrete structures, which has the advantages of mature technology, stability and reliability, but the sensitivity coefficient of strain gauges is only 2-3, the durability is very poor, and the installation process is complicated and the cost is relatively high. High, unable to meet the technical needs of people for the long-term monitoring of the life of important civil engineering structures. The cement-based intelligent composite material strain sensor has the advantages of high sensitivity coefficient, excellent durability, low cost, and simple layout proce...

Claims

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Application Information

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IPC IPC(8): G01B7/16C04B28/04
Inventor 魏剑陈晋贺格平
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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