Effects of Differential Oxygen Access on the Corrosion Behavior of Zinc Relevant to Mechanically Stabilized Earth Walls

Victor Padilla, Akram Alfantazi

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

In the past years the performance of Mechanically Stabilized Earth walls (MSE walls) have raised some controversy due to early failure at some locations. This has been attributed to aggressive environments. The purpose of this paper is to study the effect of differential oxygen access on the corrosion performance of zinc, the most common material used as protection system on MSE walls. Uneven soil compaction creates differential oxygen access, which is expected to promote corrosion macrocells that will compromise the performance of the structure. High purity zinc (99.6 wt%) was immersed in solutions with varied concentration of Na2SO4 to simulate the conditions found in soils and ground water, while the concentration of NaCl was kept at 3.5 wt%. Corrosion rates were measured using potentiodynamic polarization testing in different concentrations of oxygen, and Scanning Electron Microscope (SEM), and X-Ray Diffraction (XRD) were used to characterize the corroded samples. Results indicate an increase on the corrosion rate with increasing amount of Na2SO4, as well as a potential difference between samples in oxygen saturated, aerated and de-aerated conditions indicating the possibility for macrocell formation under the studied conditions.

Original languageBritish English
Title of host publicationSupplemental Proceedings
Subtitle of host publicationGeneral Paper Selections
PublisherJohn Wiley and Sons Inc.
Pages393-403
Number of pages11
Volume3
ISBN (Electronic)9781118062173
ISBN (Print)9781118029473
DOIs
StatePublished - 3 May 2011

Keywords

  • Corrosion
  • Mechanically Stabilized Earth Walls
  • Zinc

Fingerprint

Dive into the research topics of 'Effects of Differential Oxygen Access on the Corrosion Behavior of Zinc Relevant to Mechanically Stabilized Earth Walls'. Together they form a unique fingerprint.

Cite this