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Measurement of surface hydrogen concentration of steels in concreate with electrochemical hydrogen permeation method

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High-strength steel is one of the basic materials for supporting a well-functioning society. Prestressed concrete (PC) is a typical example of a material in which high-strength steel is used. In PC, tensile stressed steel is embedded inside the concrete, and internal bars apply compressive stress to the concrete for preventing cracks in concrete that is vulnerable to tensile stress. Moreover, corrosion inside the steel is suppressed by the alkaline environment in the concrete, so the concrete and internal bars basically work to compensate for each other's weaknesses.

Product Number: 51323-19016-SG
Author: Ryuta Ishii, Takuya Kamisho, Masayuki Tsuda
Publication Date: 2023
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High-strength steel in cracked prestressed concrete is at risk of hydrogen embrittlement, which makes it necessary to clarify the sub-surface hydrogen concentration behavior of the enclosed steel bar from the standpoint of safety. Electrochemical hydrogen permeation tests can measure the sub-surface hydrogen concentration of steel continuously and nondestructively, but the measurable geometry is limited to plates and cannot be directly applied to internal bars. We therefore developed an electrochemical hydrogen permeation test method to evaluate the sub-surface hydrogen concentration of a bar within concrete, using concrete poles as a representative example. Experimental results demonstrated that the proposed method succeeded in obtaining changes over time in the sub-surface hydrogen concentration of steel bars in prestressed concrete.

High-strength steel in cracked prestressed concrete is at risk of hydrogen embrittlement, which makes it necessary to clarify the sub-surface hydrogen concentration behavior of the enclosed steel bar from the standpoint of safety. Electrochemical hydrogen permeation tests can measure the sub-surface hydrogen concentration of steel continuously and nondestructively, but the measurable geometry is limited to plates and cannot be directly applied to internal bars. We therefore developed an electrochemical hydrogen permeation test method to evaluate the sub-surface hydrogen concentration of a bar within concrete, using concrete poles as a representative example. Experimental results demonstrated that the proposed method succeeded in obtaining changes over time in the sub-surface hydrogen concentration of steel bars in prestressed concrete.

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