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Study on sulfuric acid corrosion mechanism of concrete in immersion environment

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Document pages: 10 pages

Abstract: In this paper, the apparent diffusion coefficient − (hydroxyl ion) of Oh is selected as the index to evaluate the corrosion degree of concrete by sulfuric acid. Based on the reaction boundary layer theory, the sulfuric acid corrosion model of concrete is established and verified by experiments. The uniform test design and nonparametric regression method are used to design and process the test data of concrete sulfuric acid corrosion test. The effects of water cement ratio and pH value on the sulfuric acid corrosion mechanism of concrete were studied. The test results show that when the pH value is 2.50, the sulfuric acid corrosion degree of concrete is the most serious. In the process of sulfuric acid corrosion of concrete, the boundary layer effect always exists, and in the process of sulfuric acid corrosion, the boundary layer effect has a great impact on the performance of concrete corrosion process included rapid and stable corrosion stages. The apparent diffusion coefficient for OH− for concrete increased with the decrease of pH value and the increase of water-cement ratio and cement proportion.

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