Chloride threshold value and initial corrosion time of steel bars in concrete exposed to saline soil environments

Yang, Deqiang; Yan, Changwang; Ju, Zhang; Li, Jie

doi:10.1016/j.conbuildmat.2020.120979

Cited by 39 publications

(12 citation statements)

References 27 publications

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“…Corrosion products and chloride were also detected in the images. In the images, the passive film became incomplete and the corrosion occurred on most areas of steel bar surface, consequently, hindering the passive film formation in abundant chloride environment [59,60]. Under the protection of calcium nitrite, the corrosion phenomenon becomes milder, which is embodied by disappeared corrosion products and visible polished marks.…”

Section: Micromorphology Observationmentioning

confidence: 99%

Comparative Studies on Steel Corrosion Resistance of Different Inhibitors in Chloride Environment: The Effects of Multi-Functional Protective Film

et al. 2023

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A corrosion inhibitor was widely used to improve corrosion resistance of steel bar in reinforcement concrete structure. A kind of multi-component corrosion inhibitor, which is composed of organic and inorganic substances, was developed in this research. This corrosion inhibitor was comparatively studied with various other inhibitors by using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) methods. The results show that the OCP values and charge transfer resistance (calculated by EIS curves) of the multi-component corrosion inhibitor remain, respectively, as high as −0.45 V and 932.19 kΩ·cm−2 after 60 days immersion, which are significantly better than other groups. Wide passivation interval and various peaks in cyclic voltammograms (CV) were applied to analyze the mechanism of adsorption (organic substance) and oxidation–reduction reactions (inorganic substance). The functional groups -OH in triethanolamine (TEA) and tri-isopropanolamine (TIPA) bond to the steel bar surface quickly, behaving as an adsorbent of organic substance in early age. An additional protective precipitate related to the reactions of Fe3+ was formed by inorganic substances (Fe2(MoO4)3 and FePO4), which is consistent with the EIS results and equivalent electrochemical circuits. As an eco-friendly substitute, multi-component corrosion inhibitors possess similar or even better protecting effects on steel bars in comparison to calcium nitrite. In addition, the concept of a “multi-functional protective film” was proposed, providing a new insight to achieve modified anti-corrosion capacity of inhibitors.

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Section: Micromorphology Observationmentioning

confidence: 99%

Comparative Studies on Steel Corrosion Resistance of Different Inhibitors in Chloride Environment: The Effects of Multi-Functional Protective Film

et al. 2023

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“…The reinforcements begin to rust after the chloride content on the superficies of steel bars reaches the threshold, which indicates the beginning of the corrosion phase. The corrosion initiation time T corr is computed as (Yang et al, 2021):…”

Section: 4mentioning

confidence: 99%

Time-varying seismic resilience analysis of coastal bridges by considering multiple durability damage factors

Liang

Wei

et al. 2023

IJSI

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PurposeFor coastal bridges, the ability to recover traffic functions after the earthquake has crucial implications for post-disaster reconstruction, which makes resilience become a significant index to evaluate the seismic behavior. However, the deterioration of the material is particularly prominent in coastal bridge, which causes the degradation of the seismic behavior. As far, the research studies on resilience of coastal bridges considering multiple degradation factors and different disaster prevention capability are scarce. For further evaluating the seismic behavior of coastal bridge in the long-term context, the seismic resilience is conducted in this paper with considering multiple durability damage.Design/methodology/approachThe fuzzy theory and time-varying fragility analysis are combined in this paper to obtain the life-cycle resilience of coastal bridges.FindingsThe results show that durability damage has a remarkable impact on the resilience. After 100 years of service, the seismic resilience of bridge with poor disaster-prevention capability has greatest reduction, about 18%. In addition, the improvement of the disaster prevention capability can stabilize the resilience of the bridge at a higher level.Originality/valueIn this paper, the time-varying fragility analysis of case bridge are evaluated with considering chloride ion erosion and concrete carbonization, firstly. Then, combining fuzzy theory and fragility analysis, the triangular fuzzy values of resilience parameters under different service period are obtained. Finally, the life-cycle resilience of bridge in different disaster prevention capability is analyzed.

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“…It has been demonstrated that the permeability of chloride ions is a leading cause of corrosion of bars used in a working environment containing chloride ions, while the presence of sulfate restrains the diffusion of these ions. 19 Salt heave and frost heave deformations caused by physical or chemical reactions in the sulfate-containing soil due to temperature changes have also become a considerable and continuing hurdle for transportation security. 20 The safety and durability of buried pipeline steel under the synergistic effect of salt and temperature have rarely been explored till date.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior and mechanism of X80 steel in silty soil under the combined effect of salt and temperature

Bai

Han

et al. 2022

RSC Adv.

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Chloride threshold value and initial corrosion time of steel bars in concrete exposed to saline soil environments

Cited by 39 publications

References 27 publications

Comparative Studies on Steel Corrosion Resistance of Different Inhibitors in Chloride Environment: The Effects of Multi-Functional Protective Film

Comparative Studies on Steel Corrosion Resistance of Different Inhibitors in Chloride Environment: The Effects of Multi-Functional Protective Film

Time-varying seismic resilience analysis of coastal bridges by considering multiple durability damage factors

Corrosion behavior and mechanism of X80 steel in silty soil under the combined effect of salt and temperature

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