Method for monitoring cement-based material crack by using electrochemical impedance spectroscopy in real time

A cement-based material, real-time monitoring technology, applied in the direction of material analysis, material analysis, and measuring devices through electromagnetic means, can solve the problems of long test time, large impact, complicated operation, etc., and achieve fast measurement speed and anti-interference ability Strong, easy-to-operate effects

Inactive Publication Date: 2014-08-20
HENAN POLYTECHNIC UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing cement-based materials have shortcomings such as heavy weight, small tension-compression ratio, low fracture toughness, high brittleness, and easy cracking. Especially with the improvement of the strength of cement-based materials, the cracking and brittleness of cement-based materials become more Increasingly prominent, causing cement-based materials to be vulnerable

Method used

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  • Method for monitoring cement-based material crack by using electrochemical impedance spectroscopy in real time
  • Method for monitoring cement-based material crack by using electrochemical impedance spectroscopy in real time
  • Method for monitoring cement-based material crack by using electrochemical impedance spectroscopy in real time

Examples

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Effect test

Embodiment 1

[0047] 3. Example 1: Detection of the natural expansion and cracking process of cement-based material specimen 9 (under no-load conditions)

[0048] First, pre-embed electrode sheets 5 (can be self-made) at both ends of the prediction area of ​​the cement-based material specimen 9 (the electrode sheet 5 can be a nickel electrode sheet), and then connect the electrode sheet 5 to the electrochemical workstation for data collection through the wire 6 The system 7 is connected, and then the electrochemical workstation data acquisition system 7 is connected with the computer data processing system 8; secondly, the sinusoidal AC voltage disturbance signal with a frequency of 10mHz~10kHz and an amplitude of 5mV is passed through the electrode piece 5 (can be self-made) (the electrode piece 5 can be Nickel electrode sheet) is applied to the cement-based material specimen 9, and the response signal, that is, the sinusoidal alternating current signal, is collected by the data acquisition...

Embodiment 2

[0050] Example 2: Detection of cracks (prefabricated cracks) in the cracking process of cement-based material specimen 9 preloaded (under load conditions)

[0051] First, pre-embed electrode sheets 5 (can be self-made) at both ends of the prediction area of ​​the cement-based material specimen 9 (the electrode sheet 5 can be a nickel electrode sheet), and then connect the electrode sheet 5 to the electrochemical workstation for data collection through the wire 6 The system 7 is connected, and then the electrochemical workstation data acquisition system 7 is connected with the computer data processing system 8; secondly, the sinusoidal alternating current disturbance signal with a frequency of 10mHz~10kHz and an amplitude of 10mA is applied to the cement-based material specimen 9 through the electrode sheet 5 , the response signal, that is, the sinusoidal alternating current signal, is collected by the data acquisition system 7 of the electrochemical workstation, and then the co...

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Abstract

The invention belongs to the field of civil construction, and particularly relates to a method for monitoring a cement-based material crack by using an electrochemical impedance spectroscopy in real time. The method comprises the steps: firstly, pre-embedding electrode plates on two ends of a cement-based material test piece or placing the electrode plates during implementing, connecting the electrode plates with an electrochemical working station data acquisition system through a lead, then connecting the electrode plates with a computer data processing system; then applying different frequencies of sine alternating-current voltage (current) disturbance signals on the cement-based material test piece through the electrode plates, generating corresponding response signals by the input disturbance signals after passing through the test piece, namely sine alternating-current current (voltage) signals, and processing the response signals through the electrochemical working station data acquisition system and the computer data processing system to obtain an electrochemical impedance spectroscopy of the test piece; and finally, monitoring the cracking condition of the cement-based material test piece crack through analyzing a characteristic change of the electrochemical impedance spectroscopy. The method is high in measurement speed, strong in interference resistance, and simple to operate.

Description

technical field [0001] The invention relates to a method for detecting cracks in materials applied in the field of civil engineering, in particular to a method for real-time monitoring of cracks in cement-based materials by using electrochemical impedance spectroscopy. Background technique [0002] Cement-based materials are materials obtained by combining cement with other materials. It is the largest and most widely used civil engineering material in the world. Its advantages are: easy access to various components, low price, easy molding, Easy to manufacture into various shapes, while having good safety and durability. However, the existing cement-based materials have shortcomings such as heavy weight, small tension-compression ratio, low fracture toughness, high brittleness, and easy cracking. Especially with the improvement of the strength of cement-based materials, the cracking and brittleness of cement-based materials become more become more and more prominent, causi...

Claims

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Application Information

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IPC IPC(8): G01N27/416
Inventor 祝瑜张召才管学茂
Owner HENAN POLYTECHNIC UNIV
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