Repair of reinforced concrete bridge columns subjected to chloride-induced corrosion with ultra-high performance fiber reinforced concrete

Angelo Pelle, Bruno Briseghella, Gabriele Fiorentino, Gian Felice Giaccu, Davide Lavorato, Giuseppe Quaranta*, Alessandro Rasulo, Camillo Nuti

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)

Abstract

The rehabilitation of reinforced concrete (RC) bridge columns subjected to chloride-induced corrosion is addressed in the present paper. The proposed strategy is based on the replacement of the original external layer made of normal-strength concrete (NSC) with ultra-high performance fiber reinforced concrete (UHPFRC), and it additionally involves the substitution of the existing corroded longitudinal reinforcement with new machined steel rebars. This repair technique aims at restoring strength, stiffness, and ductility of the original column in a short time without altering its cross-section dimensions. Because of the high compactness of the UHPFRC, it also serves at improving its durability. The main contribution of the present work is a numerical investigation carried out in order to identify how the design decisions about the repair strategy influence the behavior of the restored column. The parametric investigation reveals that the length of the zone in which NSC is replaced by UHPFRC as well as the machined index (i.e., ratio between turned and original rebar cross-section area) must be properly selected to make the intervention effective. Numerical results also highlight that the main design issue to deal with is the relocation of the plastic hinge from the repaired zone towards the weak unrepaired part of the column. Practical design recommendations are finally formulated.

Original languageEnglish
JournalStructural Concrete
DOIs
Publication statusPublished - 1 Sept 2022

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (Grant No. 51778148). The work by Giuseppe Quaranta is framed within the research project “Smart technologies and decision support tools for the assessment of deteriorating reinforced concrete infrastructures in seismic areas at territorial scale” (Grant No. RM120172B37F0628) funded by Sapienza Università di Roma. Open Access Funding provided by Universita degli Studi di Roma La Sapienza within the CRUI‐CARE Agreement.

Publisher Copyright:
© 2022 The Authors. Structural Concrete published by John Wiley & Sons Ltd on behalf of International Federation for Structural Concrete.

Keywords

  • bridge column
  • machined steel rebars
  • pitting corrosion
  • reinforced concrete
  • repair
  • UHPFRC

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