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Layered cement base piezoelectric intelligent composite material and preparation method thereof

A technology of cement-based materials and composite materials, which can be applied to measurement devices, instruments, building components, etc., can solve the problems of affecting the sensing and driving functions of piezoelectric ceramics, high deformation coordination and cost, and poor anti-interference ability, and achieve good Interfacial adhesion and deformation coordination, improved sensitivity and long-term stability, strong and stable piezoelectric performance

Inactive Publication Date: 2003-10-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) Single function: For example, the optical fiber only has the sensing function but not the driving function, memory alloy, piezoelectric ceramics, electro-rheological and magneto-rheological variants only have the driving function but not the sensing function;
[0005] (2) Poor anti-interference ability: For example, the optical fiber is very sensitive to ambient temperature and humidity, which seriously affects its monitoring accuracy of stress and damage in the structure;
[0006] (3) It has an adverse effect on the performance of the matrix structure: embedding optical fibers, electrorheological and magnetorheological elements in the structure often damages the rigidity and strength of the structure;
[0007] (4) Slow response speed: such as memory alloy reaction time in seconds;
[0008] (5) Structural compatibility issues: For example, the acoustic impedance matching difference between piezoelectric ceramics and concrete structural materials seriously affects the sensing and driving functions of piezoelectric ceramics
[0009] In addition, there are problems such as interface bonding, deformation coordination and high cost
These issues hinder the implementation and development of intelligent civil engineering structures

Method used

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  • Layered cement base piezoelectric intelligent composite material and preparation method thereof
  • Layered cement base piezoelectric intelligent composite material and preparation method thereof
  • Layered cement base piezoelectric intelligent composite material and preparation method thereof

Examples

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Embodiment 1

[0022] Using PZT piezoelectric ceramic sheet, piezoelectric constant d 33 650×10 -12 Above C / N, electromechanical coupling coefficient K 33 70%, mechanical quality factor Q m It is 80, the Curie temperature is 260 degrees, the relative permittivity is 2300, the size is 20mm×30mm×0.2mm, and the electrode size is 17mm×27mm. The internal size of the steel mold used is 18mm×35mm×50mm, the groove spacing in the steel mold is 0.8mm, the groove width is 0.22mm, the groove depth is 1.1mm, and the number of grooves is 40. Common enameled wires are used to connect piezoelectric ceramic sheets and electrodes inside the composite material. The raw materials of cement-based materials are 52.5 Portland cement, a commercial superplasticizer with a water-reducing rate of 20%, quartz sand with a maximum particle size of 100 μm, and SiO 2 The content is 97% silica fume. The mixing ratio of the cement-based material is: cement: water: quartz sand: silica fume: superplasticizer=90:28:100:10:...

Embodiment 2

[0024] Using PMgN piezoelectric ceramic sheet, piezoelectric constant d 33 500×10 -12 Above C / N, the electromechanical coupling coefficient is 71%, and the mechanical quality factor is Q m It is 70, the Curie temperature is 280 degrees, the relative permittivity is 3800, the size is 20mm×30mm×0.2mm, and the electrode size is 17mm×27mm. The internal size of the steel mold used is 18mm×35mm×50mm, the groove spacing in the steel mold is 0.8mm, the groove width is 0.22mm, the groove depth is 1.1mm, and the number of grooves is 40. Common enameled wires are used to connect piezoelectric ceramic sheets and electrodes inside the composite material. The raw materials of cement-based materials are 52.5 Portland cement, a commercial superplasticizer with a water-reducing rate of 20%, quartz sand with a maximum particle size of 100 μm, and SiO 2 The content is 97% silica fume. The mixing ratio of the cement-based material is: cement: water: quartz sand: silica fume: superplasticizer=...

Embodiment 3

[0026] Using PZT piezoelectric ceramic sheet, piezoelectric constant d 33 650×10 -12 Above C / N, electromechanical coupling coefficient K 33 70%, mechanical quality factor Q m It is 80, the Curie temperature is 260 degrees, the relative permittivity is 2300, the size is 20mm×30mm×0.2mm, and the electrode size is 17mm×27mm. The internal size of the steel mold used is 18mm×35mm×50mm, the groove spacing in the steel mold is 0.2mm, the groove width is 0.22mm, the groove depth is 1.1mm, and the number of grooves is 100. Common enameled wires are used to connect piezoelectric ceramic sheets and electrodes inside the composite material. The raw materials of cement-based materials are 52.5 Portland cement, a commercial superplasticizer with a water-reducing rate of 20%, quartz sand with a maximum particle size of 100 μm, and SiO 2The content is 97% silica fume. The mixing ratio of the cement-based material is: cement: water: quartz sand: silica fume: superplasticizer=90:28:100:10:...

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Abstract

The present invention relates to an intelligent composite material applicable to civil engineering. It is composed of sheet-layer cement base material and sheet piezoelectric ceramic material which are alternatively arranged. The piezoelectric ceramic sheets are connected in parallel mode by means of signal wire, and the polarization directions of adjacent two piezoelectric ceramic sheets are opposite. The preparation method of said composite material is convenient, its cost is low, its structure compatibility is good, response speed is quick, antijamming power is strong and it has the characteristics of sensing function and driving function multiplex.

Description

technical field [0001] The invention relates to a layered cement-based piezoelectric intelligent composite material and a preparation method thereof, and its application field is intelligent civil engineering structures. Background technique [0002] In the field of civil engineering, there are many large or special structures, which are large and complex, and the consequences of structural failure are catastrophic. The requirements for their safety and durability are much higher than those of general civil engineering structures. Therefore, it is of great value to use smart materials and technologies to implement online health monitoring and active control of major civil engineering structures to make them intelligent. The basis and key of structural intelligence is smart materials. Smart materials endow structures with functions such as perception, control, and drive, so that they can automatically collect and analyze internal and external information of structures, and a...

Claims

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Application Information

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IPC IPC(8): E04C1/00G01D21/02
Inventor 张东吴科如
Owner TONGJI UNIV
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