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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

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2018 Impact Factor: 1.272

Front. Struct. Civ. Eng.    2022, Vol. 16 Issue (2) : 175-190    https://doi.org/10.1007/s11709-021-0791-z
RESEARCH ARTICLE
Sensitivity analysis of the deterioration of concrete strength in marine environment to multiple corrosive ions
Jinwei YAO1,2, 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, SO42, 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 SO42 by about 20%, while the addition of Mg2+ or Mg2+ and Cl can strengthen it by 10%–20% during a 600-d corrosion process.

Keywords sensitivity analysis      concrete strength      corrosion deterioration      multi-ion interaction      marine environment     
Corresponding Author(s): Jiankang CHEN   
Just Accepted Date: 31 December 2021   Online First Date: 22 February 2022    Issue Date: 20 April 2022
 Cite this article:   
Jinwei YAO,Jiankang CHEN. Sensitivity analysis of the deterioration of concrete strength in marine environment to multiple corrosive ions[J]. Front. Struct. Civ. Eng., 2022, 16(2): 175-190.
 URL:  
https://academic.hep.com.cn/fsce/EN/10.1007/s11709-021-0791-z
https://academic.hep.com.cn/fsce/EN/Y2022/V16/I2/175
Al2O3 CaO Fe2O3 K2O MgO Na2O SO3 SiO2 TiO2 loss
5.55 67.18 4.19 0.91 1.71 0.32 3.18 15.92 0.59 0.45
Tab.1  Chemical composition of cement (wt.%)
Fig.1  Particle size distribution of cement particles.
side length of square hole (mm) cumulative sieve residue (%)
0.08 99 ± 1
0.16 87 ± 5
0.50 67 ± 5
1.00 33 ± 5
1.60 7 ± 5
2.00 0
Tab.2  Particle distribution of reference sand
side length of square hole (mm) sieve weight (g) cumulative weight percentage (%) 5–16 mm continuous gradation cumulative sieve residue (%)
2.36 45.3 97.00 95–100
4.75 460.5 92.47 85–100
9.50 425.7 46.42 30–60
16.0 38.5 3.85 0–10
19.0 0 0 0
Tab.3  Particle size distribution of gravel
type water-cement ratio (w/c) cement water sand gravel
0.33 22 7 21 50
0.50 14 7 29 50
Tab.4  Mix design of concrete (wt.%)
symbol NaCl Na2SO4 MgSO4 water
Q 0 0 0 100
L 10 0 0 90
S 0 5 0 95
M 0 0 5 95
SL 10 5 0 85
ML 10 0 5 85
Tab.5  Design of concentration of corrosive solution (wt.%)
Fig.2  Concrete failure state: (a) compressive failure; (b) tensile failure.
Fig.3  Relationship between concrete strength and corrosion time. (a)w/c = 0.50, compressive strength; (b)w/c = 0.33, compressive strength; (c)w/c = 0.50, tensile strength; (d)w/c = 0.33, tensile strength.
Fig.4  Relationship between normalized strength and corrosion time. (a)w/c = 0.50, normalized compressive strength; (b) w/c = 0.33, normalized compressive strength; (c) w/c = 0.50, normalized tensile strength; (d) w/c = 0.33, normalized tensile strength.
ηc normalized strength value
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  Parameter fitting results of compressive strength of concrete with w/c= 0.50
ηc normalized strength value
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  Parameter fitting results of compressive strength of concrete with w/c= 0.33
ηt normalized strength value
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  Parameter fitting results of tensile strength of concrete with w/c= 0.50
ηt normalized strength value
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
Tab.9  Parameter fitting results of tensile strength of concrete with w/c= 0.33
Fig.5  Sensitivity analysis of each ions to the strength of concrete. (a) w/c= 0.50, sensitivity analysis of compressive strength; (b)w/c= 0.33, sensitivity analysis of compressive strength; (c) w/c= 0.50, sensitivity analysis of tensile strength; (d) w/c= 0.33, sensitivity analysis of tensile strength.
w/c ML SL M S L
0.50 110 560 290 335 600
0.33 175 >600 355 450 >600
Tab.10  The transition time point between strengthening and weakening of compressive strength
w/c ML SL M S L
0.50 110 205 220 235
0.33 130 350 45 270
Tab.11  The transition time point between strengthening and weakening of tensile strength
Fig.6  Sensitivity analysis of ions in sulfate solution to the concrete strength. (a) w/c = 0.50, sensitivity analysis of compressive strength; (b)w/c = 0.33, sensitivity analysis of compressive strength; (c) w/c = 0.50, sensitivity analysis of tensile strength; (d) w/c = 0.33, sensitivity analysis of tensile strength.
Fig.7  Snapshots of the concrete surface in different corrosion solutions (w/c= 0.50).
Fig.8  Images of concrete surfaces subjected to different corrosive solutions (w/c= 0.33).
Fig.9  White matter on concrete subjected to two corrosive solutions: (a) ML5; (b) L5.
Fig.10  XRD patterns of cement paste in different corrosive solutions.
Fig.11  XRD patterns of cement paste at different corrosion times: (a) ML; (b) SL; (c) M; (d) S; (e) L; (f) Q.
Fig.12  SEM images of concrete fragments in different solutions: (a) ML; (b) SL; (c) M; (d) S; (e) L; (f) Q.
Fig.13  Energy spectra of corrosion products. (a) ①; (b) ②; (c) ③; (d) ④; (e) ⑤; (f) ⑥ in Fig. 12.
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