Sensitivity analysis of the deterioration of concrete strength in marine environment to multiple corrosive ions

Abstract

The corrosion degradation behavior of concrete materials plays a crucial role in the change of its mechanical properties under multi-ion interaction in the marine environment. In this study, the variation in the macro-physical and mechanical properties of concrete with corrosion time is investigated, and the source of micro-corrosion products under different salt solutions in seawater are analyzed. Regardless of the continuous hydration effect of concrete, the damage effects of various corrosive ions (Cl^–, {\mathrm{S}\mathrm{O}}_4^{2-}, and Mg²⁺, etc.) on the tensile and compressive strength of concrete are discussed based on measurement in different salt solutions. The sensitivity analysis method for concrete strength is used to quantitatively analyze the sensitivity of concrete strength to the effects of each ion in a multi-salt solution without considering the influence of continued hydration. The quantitative results indicate that the addition of Cl^– can weaken the corrosion effect of {\mathrm{S}\mathrm{O}}_4^{2-} by about 20%, while the addition of Mg²⁺ or Mg²⁺ and Cl^– can strengthen it by 10%–20% during a 600-d corrosion process.

Graphical abstract

Keywords

sensitivity analysis / concrete strength / corrosion deterioration / multi-ion interaction / marine environment

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Acknowledgments

The authors would like to acknowledge the financial support by the National Natural Science Foundation of China (Grant Nos. 11832013 and 11772164), the project of Key Laboratory of Impact and Safety Engineering (Ningbo University), Ministry of Education (No. cj202004), and the Natural Science Foundation Project of Ningbo (No. 202003N4319), the Research and Innovation Team Funded Project of Zhejiang Business Technology Institute (No. KYTD202106), the Marine Biotechnology and Marine Engineering Discipline Group in Ningbo University, and K.C. Wong Magna Fund in Ningbo University. The authors thank Professor Weidong Zhou of Zhenjiang Zhuanbo Detection Technology Co., Ltd. for his help in the SEM detection.

Notations

Q: clear water solution

L: 10% sodium chloride solution

S: 5% sodium sulfate solution

M: 5% magnesium sulfate solution

SL: mixed solution of 5% sodium sulfate and 10% sodium chlorid

ML: mixed solution of 5% magnesium sulfate and 10% sodium chloride

Q5, Q3: concrete specimens with w/c = 0.50 or 0.33 in clear water solution

L5, L3: concrete specimens with w/c = 0.50 or 0.33 in sodium chloride solution

S5, S3: concrete specimens with w/c = 0.50 or 0.33 in sodium sulfate solution

M5, M3: concrete specimens with w/c = 0.50 or 0.33 in magnesium sulfate solution

SL5, SL3: concrete specimens with w/c = 0.50 or 0.33 in mixed solution of sodium sulfate and sodium chloride

ML5, ML3: concrete specimens with w/c = 0.50 or 0.33 in mixed solution of magnesium sulfate and sodium chloride

q5, q3: concrete strength with w/c = 0.50 or 0.33 in clear water solution

l5, l3: concrete strength with w/c = 0.50 or 0.33 in sodium chloride solution

s5, s3: concrete strength with w/c = 0.50 or 0.33 in sodium sulfate solution

m5, m3: concrete strength with w/c = 0.50 or 0.33 in magnesium sulfate solution

sl5, sl3: concrete strength with w/c = 0.50 or 0.33 in mixed solution of sodium sulfate and sodium chloride

ml5, ml3: concrete strength with w/c = 0.50 or 0.33 in mixed solution of magnesium sulfate and sodium chloride

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