Mechanical Properties of 30 Year-Old Naturally Corroded Steel Reinforcing Bars

다국어 초록 (Multilingual Abstract)

The present paper investigates the mechanical response of more than 120 corroded reinforcing bars extracted from a real bridge after 30 years in service. Corrosion was quantified using gravimetric and 3D-laser scanning measurements. An expression to relate the average and critical corrosion levels was found, the latter being the main parameter governing the capacity of corroded bars. Whereas the strength of the material was not affected by corrosion, the ultimate strain decreased sharply. However, strains were not only affected by cross-sectional reduction but also by the shape of the critical pit and necking at failure.

목차 (Table of Contents)

• Abstract
• 1. Introduction
• 2. Description of Experiments
• 3. Corrosion Relationships
• 4. Results and Discussion
• 5. Conclusions
• References

참고문헌 (Reference)

1 A. Cobo, "Variación de las características mecánicas de armaduras de alta ductilidad B500SD en función de su grado de corrosión" Editorial CSIC 61 (61): 517-532, 2011

2 "VXElements-Creaform"

3 "UNE-EN-ISO-15630-01 : 2011. Steel for reinforced and prestresed concrete—testing methods"

4 Fujian Tang, "Three-dimensional corrosion pit measurement and statistical mechanical degradation analysis of deformed steel bars subjected to accelerated corrosion" Elsevier BV 70 : 104-117, 2014

5 K. Lundgren, "Tests on anchorage of naturally corroded reinforcement in concrete" Springer Science and Business Media LLC 48 (48): 2009-2022, 2015

6 Ch.Alk. Apostolopoulos, "Tensile behavior of corroded reinforcing steel bars BSt 500s" Elsevier BV 20 (20): 782-789, 2006

7 Weiping Zhang, "Tensile and fatigue behavior of corroded rebars" Elsevier BV 34 : 409-417, 2012

8 A.M. Bazán, "Study of mechanical properties of corroded steels embedded concrete with the modified surface length" Elsevier BV 117 : 80-87, 2016

9 José Santos, "Strength and Ductility of Damaged Tempcore Rebars" Elsevier BV 114 : 800-807, 2015

10 Cairns, J., "Mechanical properties of corrosion-damaged reinforcement simulated pitting damage, test" 102 : 256-264, 2005

11 Chunhua Lu, "Mechanical properties of corroded steel bars in pre-cracked concrete suffering from chloride attack" Elsevier BV 123 : 649-660, 2016

12 Ignasi Fernandez, "Mechanical model to evaluate steel reinforcement corrosion effects on σ – ε and fatigue curves. Experimental calibration and validation" Elsevier BV 118 : 320-333, 2016

13 Ch.Alk. Apostolopoulos, "Mechanical behavior of corroded reinforcing steel bars S500s tempcore under low cycle fatigue" Elsevier BV 21 (21): 1447-1456, 2007

14 Palsson, R., "Mechanical Response of Corroded Steel Reinforcement of Abandoned Concrete Bridge" American Concrete Institute 99 (99): 2002

15 S.S. Institudes, Armeringsstång, "Kamstång Ks 60 och Ks 60S (STD-1250)"

16 Mohammad Tahershamsi, "Investigating correlations between crack width, corrosion level and anchorage capacity" Informa UK Limited 13 (13): 1294-1307, 2017

17 Wenjun Zhu, "Influences of corrosion degree and corrosion morphology on the ductility of steel reinforcement" Elsevier BV 148 : 297-306, 2017

18 M. Tahershamsi, "Four levels to assess anchorage capacity of corroded reinforcement in concrete" Elsevier BV 147 : 434-447, 2017

19 Wenjun Zhu, "Experimental investigation of the relationships between residual cross-section shapes and the ductility of corroded bars" Elsevier BV 69 : 335-345, 2014

20 Ignasi Fernandez, "Evaluation of corrosion level of naturally corroded bars using different cleaning methods, computed tomography, and 3D optical scanning" Springer Science and Business Media LLC 51 (51): 2018

21 Abdullah A. Almusallam, "Effect of degree of corrosion on the properties of reinforcing steel bars" Elsevier BV 15 (15): 361-368, 2001

22 Du, Y. G., "Effect of corrosion on ductility of reinforcing bars" 57 : 407-419, 2005

23 Wenjun Zhu, "Effect of corrosion of reinforcement on the mechanical behaviour of highly corroded RC beams" Elsevier BV 56 : 544-554, 2013

24 Stefania Imperatore, "Degradation relationships for the mechanical properties of corroded steel rebars" Elsevier BV 148 : 219-230, 2017

25 Ignasi Fernandez, "Corrosion effects on the mechanical properties of reinforcing steel bars. Fatigue and σ–ε behavior" Elsevier BV 101 : 772-783, 2015

26 C.A. Apostolopoulos, "Consequences of steel corrosion on the ductility properties of reinforcement bar" Elsevier BV 22 (22): 2316-2324, 2008

27 Charis A. Apostolopoulos, "Chloride-induced corrosion of steel reinforcement – Mechanical performance and pit depth analysis" Elsevier BV 38 : 139-146, 2013

28 Mohammad Tahershamsi, "Anchorage of naturally corroded bars in reinforced concrete structures" Thomas Telford Ltd. 66 (66): 729-744, 2014

29 "ASTM G1. Standard practice for preparing, cleaning, and evaluating corrosion test"

30 Silvia Caprili, "A new generation of high-ductile Dual-Phase steel reinforcing bars" Elsevier BV 179 : 66-79, 2018

31 Ignasi Fernandez, "3D FEM model development from 3D optical measurement technique applied to corroded steel bars" Elsevier BV 124 : 519-532, 2016