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

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...

AI Technical Summary

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 to damage or failure

At present, a series of technologies such as ultrasonic method, OTDR technology, image acquisition and processing method, and radiation method have been proposed to observe and monitor the cracks of cement-based materials, but the above methods have certain limitations, such as complicated operation, long test time, random Strong, highly influenced by subjective factors

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