Effects of stray current and silicate ions on electrochemical behavior of a high-strength prestressing steel in simulated concrete pore solutions

2022 ◽  
pp. 110083
Author(s):  
Jing Ming ◽  
Xiaocheng Zhou ◽  
Haining Zuo ◽  
Linhua Jiang ◽  
Yiqing Zou ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
High Strength ◽  
Stray Current ◽  
Prestressing Steel

scholarly journals Analysis of the Bauschinger Effect in Cold Drawn Pearlitic Steels

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 114
Author(s):  
Jesús Toribio ◽  
Viktor Kharin ◽  
Francisco-Javier Ayaso ◽  
Miguel Lorenzo ◽  
Beatriz González ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Bauschinger Effect ◽  
High Strength ◽  
Pearlitic Steel ◽  
Internal Stresses ◽  
Compression Load ◽  
Prestressing Steel ◽  
Hardening Rule ◽  
Steel Wires ◽  
Cyclic Tension

Prestressing steel wires usually undergo cyclic loading in service. Therefore, it is of interest to analyse certain features of their mechanical behaviour under this type of loading, such as the Bauschinger effect (BE) or the hardening rule, that fit the real mechanical behaviour appropriately. In this study, different samples of high strength pearlitic steel wires were subjected to cyclic tension-compression load exceeding the material yield strength, thus generating plastic strains. From the experimental results, various parameters were obtained revealing that analysed steels exhibited the so-called Masing type BE. In addition, the variation of the BE characteristics (of the effective and internal stresses) with the applied plastic pre-strain indicated that the studied materials followed a mixed strain hardening rule with the domination of the kinematic component.

Initiation of stress corrosion cracking in cold-drawn prestressing steel in hardened cement mortar exposed to chlorides

CORROSION ◽  
10.5006/3730 ◽  
2021 ◽  
Author(s):  
Dyana Joseline ◽  
Radhakrishna Pillai ◽  
Lakshman Neelakantan
Keyword(s):  
Stress Corrosion ◽  
Passive Film ◽  
Stress Corrosion Cracking ◽  
Cement Mortar ◽  
High Strength ◽  
Corrosion Cracking ◽  
Hardened Cement ◽  
Electrochemical Characteristics ◽  
Residual Tensile Stress ◽  
Prestressing Steel

Cold-drawn, high strength, prestressing (PS) steel strands are widely used in pretensioned concrete (PTC) structures. This paper discusses the stress corrosion cracking (SCC) of PS steel embedded in cement mortar and gradually exposed to chlorides. Various stages of the passive to active (P-to-A) transition, which marks the onset of SCC, were investigated using EIS technique. The key mechanisms were identified and confirmed using SEM/EDAX, XRD and Confocal Raman Spectroscopy. It was found that the passive film on unstressed PS steel has better electrochemical characteristics than that on conventional steel rebars. However, the residual tensile stress at the surface of PS steels can assist passive film cracking after chloride attack - contrary to the pitting corrosion without cracking of passive film in conventional steels. Further, tests indicated that the concentration of chlorides required to crack the passive film in PS steels can reduce by about 50% when prestressed – as in field structures. Chemical composition, stress state and microstructural features at the PS steel surface were identified as possible factors influencing the initiation of SCC in PTC structures.

Electrochemical behavior and biocompatibility of Ti-Fe-Cu alloy with high strength and ductility

2017 ◽  
Vol 707 ◽  
pp. 291-297 ◽  
Author(s):  
V.Yu. Zadorozhnyy ◽  
X. Shi ◽  
D.S. Kozak ◽  
T. Wada ◽  
J.Q. Wang ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
High Strength ◽  
Cu Alloy ◽  
Strength And Ductility

Influence of the Weld Heat Input on the Electrochemical Behavior of the 921A High Strength Steel Welding Joints

2015 ◽  
Vol 817 ◽  
pp. 312-318
Author(s):  
Kai Wang ◽  
Jiang Long Yi ◽  
Shi Da Zheng ◽  
Chun Fu Guo ◽  
He Xin Chen ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
Heat Input ◽  
High Strength Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Cored Wire ◽  
Input Condition ◽  
Base Steel ◽  
Welding Joints ◽  
Weld Heat

Using the prepared gas-shielded flux-cored wire for welding 600MPa high strength steel, the 921A high strength steels were welded at different weld heat input condition of 10 kJ/cm, 15 kJ/cm and 20 kJ/cm. The influence of weld heat input on the electrochemical behavior of the 921A high strength steel welding joints were studied in this paper. The results show that, at different weld heat input condition, the linear polarization resistances (LPR) of all the welding joints welded by using the prepared flux-cored wire were close to that of the 921A base steel, as can be identified as the same LPR value at 15 kJ/cm weld heat input condition. By observing the surfaces of the linear polarized welding joints samples, it was found that the welding joint at 15 kJ/cm weld heat input had the smallest corrosive area by macro observing, showing the pitting corrosion by micro observing and presents the least corrosion pit.

Corrosion-Fatigue of High Strength Steel Bars: Evolution of Crack Aspect Ratio

2011 ◽  
Vol 488-489 ◽  
pp. 1-4
Author(s):  
Jesús Toribio ◽  
Juan Carlos Matos ◽  
Beatriz González ◽  
J. Escuadra
Keyword(s):  
Aspect Ratio ◽  
Corrosion Fatigue ◽  
Crack Front ◽  
Crack Depth ◽  
High Strength ◽  
Initial Crack ◽  
Crack Advance ◽  
Prestressing Steel ◽  
Steel Wires ◽  
Steel Bars

Abstract. This paper shows the evolution of the surface crack front in prestressing steel wires subjected to fatigue in air and to corrosion-fatigue in Ca(OH)2+NaCl. To this end, a numerical modelling was made on the basis of a discretization of the crack front (characterized with elliptical shape), considering that the crack advance at each point is perpendicular to such a front according to a Paris-Erdogan law, and using a three-parameter stress intensity factor (SIF). Each analyzed case (a particular initial crack geometry) was characterized by the evolution of the semielliptical crack aspect ratio (relation between the semiaxes of the ellipse) with the relative crack depth and by the variation of the maximum dimensionless SIF at the crack front

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