Experiment Study on Corrosion Rate of Concrete Specimens Immersed in Sulfuric Acid

Abstract:

Concrete degradation in sulfuric acid environment had been widely recognized and the corrosion mechanism needs be further understood. A long time immersion test of concrete specimens in dilute sulfuric acid is carried out. The experiment is designed by uniform design method and through which eight groups of concrete specimens with water cement ratios (W/C) ranging from 0.35 to 0.70 are soaked in sulfuric acid with pH values ranging from 2.00 to 4.00 for 150 days. The pH meter is used to monitor the pH changing of the soak solution. The titrating sulfuric acid is added to maintain the original pH value of the solution and then acid consumption of specimens is recorded. Based on concentration boundary layer theory, a theoretical reaction rate model is proposed and whose validity is proved by experiment. The comparison shows that the theoretical model can well reflect the experimental results in the early phase of immersion and in later phase of immersion, it will over estimate the corrosion speed due to the gypsum layer effect is ignored.

• Periodical: Advanced Materials Research (Volumes 446-449)
• Pages: 3652-3658
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.446-449.3652
• Online since: January 2012
• Authors: Zhi Gang Song, Hong Guang Min, Xue Song Zhang
• Keywords: Concentration Boundary, Concrete, Corrosion, Sulfuric Acid, Uniform Design

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