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51313-02448-Numerical Evaluation of Galvanized Steel Corrosion in Mechanically Stabilized Earth Walls

Product Number: 51313-02448-SG
ISBN: 02448 2013 CP
Author: Pouria Ghods
Publication Date: 2013
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$20.00
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The galvanized steel is generally used in mechanically stabilized walls to reinforce the soil because of its high corrosion resistance compared to carbon steel and also its cost effectiveness compared to stainless steel. In the galvanized steel reinforcement steel is protected against corrosion by a tiny layer of zinc cover with the thickness of 20-40 m. The corrosion of galvanized steel in soil consists of three stages. In the first stage of corrosion the zinc layer dissolves into soil pore solution. When the underlying rebar is exposed to the soil environment in the second stage of corrosion a galvanic corrosion cell forms between the zinc and steel that limits the corrosion of steel reinforcement. The carbon steel reinforcement starts corroding after the depletion of the zinc layer in the last stage of corrosion. In this work the three stages of galvanized steel corrosion were modeled using the finite element method and a numerical study was conducted to determine the corrosion rate of galvanized steel in soil exposed to corrosive environment. The results were compared with those of carbon steel reinforcement and the corrosion performance of galvanized steel and its effect on the service life of mechanically stabilized earth walls was studied.

The galvanized steel is generally used in mechanically stabilized walls to reinforce the soil because of its high corrosion resistance compared to carbon steel and also its cost effectiveness compared to stainless steel. In the galvanized steel reinforcement steel is protected against corrosion by a tiny layer of zinc cover with the thickness of 20-40 m. The corrosion of galvanized steel in soil consists of three stages. In the first stage of corrosion the zinc layer dissolves into soil pore solution. When the underlying rebar is exposed to the soil environment in the second stage of corrosion a galvanic corrosion cell forms between the zinc and steel that limits the corrosion of steel reinforcement. The carbon steel reinforcement starts corroding after the depletion of the zinc layer in the last stage of corrosion. In this work the three stages of galvanized steel corrosion were modeled using the finite element method and a numerical study was conducted to determine the corrosion rate of galvanized steel in soil exposed to corrosive environment. The results were compared with those of carbon steel reinforcement and the corrosion performance of galvanized steel and its effect on the service life of mechanically stabilized earth walls was studied.

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