Method of measuring critical current density in hydrogen evolution through reinforced steel bar in reinforced concrete structure

Abstract

The invention discloses a method of measuring a critical current density in hydrogen evolution through a reinforced steel bar in a reinforced concrete structure. The method comprises the steps of connecting the reinforced steel bar put in a concrete sample, a counter electrode and a reference electrode to an electrochemical workstation respectively in a corresponding mode so as to form a three-electrode testing system; starting the electrochemical workstation, conducting a cathodic polarization test on the reinforced steel bar, firstly testing a natural potential of the reinforced steel bar, then using the natural potential as a starting point, and scanning a changing value of an electric potential of the reinforced steel bar in a cathodic polarization area; finishing the polarization of the reinforced steel bar when the electric potential of reinforced steel bar in the cathodic polarization area is in an interval value n so as to obtain a cathodic polarization curve; calculating a first derivative or a second derivative of the cathodic polarization curve, finding a mutational site, determining the mutational site as an original state occurred during the hydrogen evolution reaction through the reinforced steel bar, and measuring an electric potential value and an electric current density value of the mutational site. The measuring method can quickly and accurately measure the critical current density in hydrogen evolution through the reinforced steel bar, does not destroy the concrete structure, and is applicable to engineering application.

Description

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AI Technical Summary

Benefits of technology

This technology uses an electrical current flow through metallic structures that are prone to crack or damage during use. By measuring these changes with different methods, it becomes possible to predict how fast they will break down when exposed to water vapor (H2O). It also helps prevent cracks from forming at certain points along their length where there may be high pressure inside them due to corrosion caused by H2. Overall, this process allows researchers to better control the risk associated with metal materials used around us.

Problems solved by technology

Technologies aim towards improving the performance of reinforce concrete constructions while reducing their risk from environmental factors like salt water ingression caused by sea acid ionized substances. Current techniques involve monitoring changes over time in electrical conductivity values associated with the presence of sulfate stress crack resistance (SSC). These conventional measures require expensive instrumentation and may cause delays in detecting cracks leading to failings.

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