Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method

A technology of piezoelectric sensors and piezoelectric ceramics, which is applied in the field of piezoelectric sensors and steel corrosion monitoring, can solve problems that have not been reported, and achieve the effects of good reliability, simple calculation, and accurate corrosion status

Inactive Publication Date: 2014-02-12
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been researches on the corrosion monitoring of concrete steel bars based on piezoelectric sensor acoustic emission technology and ultrasonic technology, but the research on steel bar corrosion monitoring based on piezoelectric sensor electromechanical impedance technology has not been reported.

Method used

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  • Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method
  • Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method
  • Piezoelectric sensor for steel-bar corrosion monitoring and steel-bar corrosion monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The PZT-5 piezoelectric ceramic with a size of Φ10×1.8mm is used as the sensing element, in which the lower surface electrode of the piezoelectric ceramic extends from the side to the upper surface, and is divided into two parts from the original upper surface electrode. A mixture of ordinary Portland cement, E51 epoxy resin and polyamide curing agent was used as the encapsulation layer, and the copper core RVVP shielded cable was used as the wire to prepare the piezoelectric sensor for steel corrosion monitoring. The preparation process is as follows: first, the shielded cable is respectively welded to the electrode part extending from the lower surface of the piezoelectric ceramic to the upper surface and the original upper surface electrode part of the piezoelectric ceramic; then, the piezoelectric ceramic sheet after welding the wire Fixed in the mold, the welding surface of the ceramic sheet is 3mm away from the inner wall of the mold, the side of the ceramic sheet ...

Embodiment 2

[0046] Make a reinforced concrete rectangular cross-section beam with a strength grade of C30. The size of the beam is length×width×height=500mm×200mm×200mm. The cement is 42.5 grade ordinary Portland cement produced by a certain company, the sand is medium sand with a fineness modulus of 2.5 in a certain real estate, and the crushed stone is continuously graded 5-20mm crushed stone in a certain real estate. The longitudinal tensile steel bars used are Secondary hot rolled ribbed steel bars. First, mix the mixture of cement, epoxy resin and curing agent with a mass ratio of 1:1:0.25, and spread it evenly on the surface of the steel bar and the lower surface of the piezoelectric sensor; then, paste the piezoelectric sensor on the surface of the steel bar, And press to discharge the air and excess adhesive, after curing in the air for 48 hours; fix the steel bars pasted with sensors in the pouring mold, pour concrete raw materials, and demould after standard curing for 24 hours....

Embodiment 3

[0048] After the reinforced concrete beam was maintained for 7 days, according to the operation method of embodiment 2, an impedance tester was used to test the resistance-frequency characteristics of the piezoelectric sensor at 50kHz-200kHz, and its resistance-frequency spectrum was as follows Figure 5 shown.

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Abstract

The invention relates to a piezoelectric sensor for steel-bar corrosion monitoring and a steel-bar corrosion monitoring method, and belongs to the technical field of monitoring of an intelligent sensor in a reinforced concrete structure. The sensor is composed of piezoelectric ceramics, an electrode face, an encapsulation layer composed of cement, epoxy resin and curing agent, and shielded conducting wires. The monitoring method based on the sensor comprises the following steps: coupling the piezoelectric sensor and steel bars by adopting a mixture of cement, epoxy resin and curing agent as a bonding agent, testing an electrical impedance-frequency spectrogram of the sensor at different periods, then carrying out root-mean-square deviation calculation, and taking a calculation result as quantification index of judging the condition of steel-bar corrosion inside concrete. The piezoelectric sensor provided by the invention has the characteristics of simpleness in preparation, convenience in use, good in durability and the like; the monitoring method based on the sensor has the characteristics of being accurate, reliable, convenient and intuitive.

Description

technical field [0001] The invention relates to the technical field of intelligent sensor monitoring of reinforced concrete structures, in particular to a piezoelectric sensor for monitoring steel bar corrosion in concrete and a method for monitoring steel bar corrosion based on the sensor. Background technique [0002] The environment of concrete is generally harsh, and there are many factors that lead to its durability damage. Among them, the corrosion of steel bars is the main reason that affects its durability and even leads to the instability and damage of concrete structures. Corrosion of steel bars will reduce the effective section of steel bars, decrease the mechanical properties of steel bars, decrease the bond force between steel bars and concrete, generate rust swelling force, reduce the compressive strength of concrete, and cause cracking and peeling of the concrete protective layer, thereby reducing the strength of the concrete structure. carrying capacity. Esp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04G01N17/00
Inventor 徐东宇程新黄世峰李兰
Owner UNIV OF JINAN
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