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

doi:10.1007/s11709-021-0791-z

Frontiers of Structural and Civil Engineering

2022, Vol. 16

Issue (2): 175-190 https://doi.org/10.1007/s11709-021-0791-z

本期目录

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

Jinwei YAO^1,², Jiankang CHEN²(

)

¹. Zhejiang Business Technology Institute, Ningbo 315012, China
². Key Laboratory of Impact and Safety Engineering, Ministry of Education, School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China

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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^–, $S O 4 2 −$ , 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 $S O 4 2 −$ by about 20%, while the addition of Mg²⁺ or Mg²⁺ and Cl^– can strengthen it by 10%–20% during a 600-d corrosion process.

Key words： sensitivity analysis concrete strength corrosion deterioration multi-ion interaction marine environment

收稿日期: 2021-08-07 出版日期: 2022-04-20

Corresponding Author(s): Jiankang CHEN

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2022, 16(2): 175-190.
Jinwei YAO, Jiankang CHEN. Sensitivity analysis of the deterioration of concrete strength in marine environment to multiple corrosive ions. Front. Struct. Civ. Eng., 2022, 16(2): 175-190.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-021-0791-z
https://academic.hep.com.cn/fsce/CN/Y2022/V16/I2/175

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Fig.4

$η c$	normalized strength value
$η c$	5% MgSO₄ + 10% NaCl	5% Na₂SO₄ + 10% NaCl	5% MgSO₄	5% Na₂SO₄	10% NaCl	water
B₂	–2.821 × 10^–6	–1.836 × 10^–6	–2.356 × 10^–6	–2.588 × 10^–6	–1.649 × 10^–6	–1.360 × 10^–6
B₁	1.331 × 10^–3	1.436 × 10^–3	1.460 × 10^–3	1.581 × 10^–3	1.3348 × 10^–3	1.167 × 10^–3
R²	0.862	0.968	0.788	0.989	0.952	0.938

Tab.6

$η c$	normalized strength value
$η c$	5% MgSO₄ + 10% NaCl	5% Na₂SO₄ + 10% NaCl	5% MgSO₄	5% Na₂SO₄	10% NaCl	water
B₂	–2.054 × 10^–6	–2.560 × 10^–6	–2.234 × 10^–6	–3.066 × 10^–6	–1.901 × 10^–6	–0.981 × 10^–6
B₁	1.113 × 10^–3	1.932 × 10^–3	1.370 × 10^–3	1.862 × 10^–3	1.532 × 10^–3	0.925 × 10^–3
R²	0.848	0.977	0.974	0.887	0.971	0.978

Tab.7

$η t$	normalized strength value
$η t$	5% MgSO₄ + 10% NaCl	5% Na₂SO₄ + 10% NaCl	5% MgSO₄	5% Na₂SO₄	10% NaCl	water
B₂	–4.041 × 10^–6	–3.869 × 10^–6	–5.254 × 10^–6	–5.083 × 10^–6	–2.794 × 10^–6	–2.764 × 10^–6
B₁	2.590 × 10^–3	2.922 × 10^–3	3.286 × 10^–3	3.340 × 10^–3	2.130 × 10^–3	2.136 × 10^–3
R²	0.937	0.965	0.911	0.658	0.846	0.840

Tab.8

$η t$	normalized strength value
$η t$	5% MgSO₄ + 10% NaCl	5% Na₂SO₄ + 10% NaCl	5% MgSO₄	5% Na₂SO₄	10% NaCl	water
B₂	–3.017 × 10^–6	–4.482 × 10^–6	–2.400 × 10^–6	–4.486 × 10^–6	–1.778 × 10^–6	–1.628 × 10^–6
B₁	1.719 × 10^–3	2.905 × 10^–3	1.435 × 10^–3	2.546 × 10^–3	1.443 × 10^–3	1.324 × 10^–3
R²	0.833	0.933	0.973	0.938	0.836	0.891

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