The effect of Corroded Longitudinal Steel Bars on Flexural Behavior of Reinforced Concrete Beams
Anbar Journal of Engineering Sciences,
2022, Volume 13, Issue 2, Pages 122-132
AbstractThis study aims to examine the relationship between the corrosion rate of longitudinal tensile steel bars and the maximum flexural strength of reinforced concrete RC beams. The study's methodology is designed to show the structural behavior of corroded and non-corroded RC beams, such as ultimate load, deflection, stiffness, crack patterns, and failure mode. Three rectangular beams were cast with dimensions (150× 200 ×1200) mm, and all specimens have the same amount of longitudinal and transverse reinforcement and the same concrete strength. The major parameter is the theoretical mass loss level due to corrosion (0, 10, 15) %. Electrochemical technique was used to accelerate the corrosion in the longitudinal tensile bars. All RC beams were tested under four-point monotonic loading. The test results confirm that the cracking load in corroded beams decreased by 25% comparative to the non- corroded beam. The increase of the percent of corrosion experimental mass loss by 8.25 and 14.15 % decreased the ultimate load by about 14 % and 27%, respectively. This reduction coincided with the decrease in deflection values in mid-span for the ultimate load, which decreased by 53.9% and 46.3%. However, the flexural stiffness was reduced by 13.4 and 15.6% for corroded beams with mass loss (8.25 and 14.15), respectively, compared to the control beam (non-corroded RC beam).
 K. Koulouris and C. Apostolopoulos, “An experimental study on effects of corrosion and stirrups spacing on bond behavior of reinforced concrete,” Metals (Basel)., vol. 10, no. 10, pp. 1–14, 2020, doi: 10.3390/met10101327.
 P. Ghoddousi, M. Haghtalab, and A. A. Shirzadi Javid, “Experimental and numerical analysis of the effects of different repair mortars on the controlling factors of macro-cell corrosion in concrete patch repair,” Cem. Concr. Compos., vol. 121, p. 104077, Aug. 2021, doi: 10.1016/J.CEMCONCOMP.2021.104077.
 A. reza Kashani and T. Ngo, Self-Compacting Concrete: Materials, Properties, and Applications. A volume in Wood-head Publishing Series in Civil and Structural Engineering, Book, 2020.
 U. Angst, Ueli Angst Chloride induced reinforcement corrosion in concrete, no. January. 2011.
 A. N. Patil, B. G. Birajdar, and H. K. Erande, “Study of Influence of Corrosion and Cracking on Bond Behavior of Reinforced Concrete Member,” no. September 2017, 2018.
 A. Kagermanov and I. Markovic, “FE-Modelling Techniques for Structural Capacity Assessment of Corroded FE-Modelling Techniques for Structural Capacity Assessment of Corroded Reinforced Concrete Structures .,” no. September, pp. 1–8, 2019.
 H. – W. Reinhardt, “Corrosion protection of reinforcing steels,” 2009.
 J. Cairns and Z. Zhao, “Behaviour of concrete beams with exposed reinforcement., ”Proc. Inst. Civ. Eng. Build., vol. 99, no. 2, pp. 141–154, 1993.
 C. Fang, K. Lundgren, L. Chen, and C. Zhu, “Corrosion influence on bond in reinforced concrete, ” Cem. Concr. Res., vol. 34, no. 11, pp. 2159–2167, 2004.
 J. Peng, H. Tang, and J. Zhang, “Structural Behavior of Corroded Reinforced Concrete Beams Strengthened with Steel Plate,” J. Perform. Constr. Facil., vol. 31, no. 4, 2017, doi: 10.1061/(asce)cf.1943-5509.0001004.
 P. Yuan, L. Xiao, X. Wang, and G. Xu, “Failure mechanism of corroded RC beams strengthened at shear and bending positions,” Eng. Struct., vol. 240, no. April, p. 112382, 2021, doi: 10.1016/j.engstruct.2021.112382.
 N. Mahmood and A. Lateef, “Effect of Corrosion Longitudinal Steel Bars on the Flexural Strength of Rc Beams,” Tikrit J. Eng. Sci., vol. 28, no. 2, pp. 44–53, 2021, doi: 10.25130/tjes.28.2.04.
 Iraqi Specifications No. (5), 2019 for Portland Cement requirements. .
 IQS NO. 45, 1984, “Aggregate from Natural Sources for Concrete and Construction. Central Agency for Standardization and Quality Control”, Baghdad, Iraq. .
 ASTM, “Standard Specification for Deformed and Plain Carbon Steel Bars for Concrete,” B. Stand. Vol. 01.04, pp. 1–6, 2004.
 ACI 318-19, Building Code (ACI 318-19) and Commentary on Building Code Requirements for Structural Concrete (ACI 318R-19). 2019.
 A. C. A. C. 211 211, Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass Concrete (ACI 211.1-91) Donald, no. 9. 2006, pp. 120–121.
 ASTM C39/C39M-05. Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens. ASTM Int. 2005; 1– 8. .
 ASTM C496/C496M-11. Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens. ASTM Stand. Vol. 04.02. 2011;1–5. .
 ASTM C78-15. Standard test method for flexural strength of concrete (using simple beam with third-point loading). American Society for Testing and Material. 2015. .
 ASTM C469-02. Standard Test Method for Static Modulus of Elasticity and Poisson’s Ratio of Concrete in Compression. ASTM Stand. B., vol. 04.2002;1–5. .
 M. Sahmaran, O. Anil, M. Lachemi, G. Yildirim, A. F. Ashour, and F. Acar, “Effect of corrosion on shear behavior of reinforced engineered cementitious composite beams, ” ACI Struct. J., vol. 112, no. 6, pp. 771–782, 2015.
 B. Almassri, A. Kreit, F. Al Mahmoud, and R. Francois, “Behaviour of corroded shearcritical reinforced concrete beams repaired with NSM CFRP rods, ” Compos. Struct., vol. 123, pp. 204–215, 2015.
 Z. Ye, W. Zhang, and X. Gu, “ Deterioration of shear behavior of corroded reinforced concrete beams, ” Eng. Struct., vol. 168, no. May, pp. 708–720, 2018.
 B. Hu, Y. Zhou, F. Xing, L. Sui, and M. Luo, “Experimental and theoretical investigation on the hybrid CFRP-ECC flexural strengthening of RC beams with corroded longitudinal reinforcement,” Eng. Struct., vol. 200, no. April, p. 109717, 2019, doi: 10.1016/j.engstruct.2019.109717.
 H. Shabani Attar, M. Reza Esfahani, and A. Ramezani, “Experimental investigation of flexural and shear strengthening of RC beams using fiber-reinforced self-consolidating concrete jackets,” Structures, vol. 27, no. May, pp. 46–53, 2020, doi: 10.1016/j.istruc.2020.05.032.
 A. A. Torres-Acosta, S. Navarro-Gutierrez, and J. Terán-Guillén, “Residual flexure capacity of corroded reinforced concrete beams,” Eng. Struct., vol. 29, no. 6, pp. 1145–1152, 2007, doi: 10.1016/j.engstruct.2006.07.018.
 G.G. Triantafyllou, T.C. Rousakis, A.I. Karabinis, “Effect of patch repair and strengthening with EBR and NSM CFRP laminates for RC beams with low, medium and heavy corrosion, ” Compos. B Eng. 133 (2018) 101–111.
 A. Abdel-Mohti and H. Shen, “Strengthening of corroded reinforced SCC-RAP members with CFRP,” Fibers, vol. 4, no. 1, pp. 1–24, 2016, doi: 10.3390/fib4010003.
 T. Zhang, L. Xu, P. Li, and H. Chen, “Numerical Simulation Analysis for Mechanical Properties of Corroded Reinforced Concrete Beams,” vol. 4, no. 7, pp. 44–50, 2021, doi: 10.25236/AJETS.2021.040708.
 K. Najim, “Mechanics and Structures Determination and Enhancement of Mechanical and Thermo-physical Behaviour of Crumb Rubber-modified Structural Concrete Khalid Battal Najim , BSc Eng ., MSc Eng .,” no. January 2012, 2013.
 G. Malumbela, P. Moyo, and M. Alexander, “Longitudinal strains and stiffness of RC beams under load as measures of corrosion levels,” Eng. Struct., vol. 35, pp. 215–227, 2012, doi: 10.1016/j.engstruct.2011.11.021.
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