Corrosion Behavior of F30S30 Concrete under Wet-Dry Cycles in Simulated Seawater with Magnesium Salt and Sulfate

Abstract:

In this paper, we present the corrosion behavior of F30S30 concrete used for a bridge cap which was investigated in simulated seawater with 2.0% NaCl, 0.35% MgCl₂, and 0.25% Na₂SO₄ under wetdry cycles. This behavior was compared with those in 3.5% NaCl, 5.0% Na₂SO₄, and 3.5% NaCl + 5% Na₂SO₄ solutions. Results show that the change in pore structure obtained through X-ray computed tomography could reflect the amount of corrosion products and the degree of destruction. The variety and quantity of corrosion products varied with the corrosive environment. The damage mechanisms of concrete also changed according to the corrosive environment. The effects of Mg²⁺ and SO₄^2- were superimposed on each other for the simulated seawater environment, thereby posing a serious threat to the structure, primarily through damage and coarsening of the pore structure caused by Mg²⁺.

• Periodical: Advanced Materials Research (Volume 936)
• Pages: 1366-1372
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.936.1366
• Online since: June 2014
• Authors: Guan Guo Liu*, Aibin Ma, Chao Ming Pang, Ping Zhang, Hong Gen Qin, Lun Wang
• Keywords: Performance Deterioration, Pore Structure, Simulated Seawater Environment, Wet-Dry Cycle

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