PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 il l li t . i ir t. i i tructural Integrity rocedia 00 (2019) 000–000

www.elsevier.com/locate/procedia .elsevier.co /locate/procedia

ScienceDirect

Procedia Structural Integrity 33 (2021) 371–384

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo Abstract Corrosion of steel reinforcement bars is a crucial issue for the reinforced concrete structures. Being one of the most common deterioration mechanisms, corrosion severely affects the serviceability and durability of the structure as the steel reinforcement suffers from a reduction of the cross section and deterioration of the mechanical properties. Additionally, due to the steel oxidation process, residual material is formed, and the volume occupied by the reinforcement increases, leading to cracking and spalling of the concrete cover. A predictive model coupling concrete carbonation process and phase-field approach for brittle fractures is proposed to simulate the carbonation induced corrosion of rebar and the subsequent cracking phenomenon. First, a Fick diffusion law is used to describe the carbon dioxide (CO 2 ) diffusion within the concrete which leads to a generalized corrosion process. As the corrosion evolves, the steel mass loss is converted into expansion strain due to the formation of residual material, and the damage evolution within the concrete cover is determined. After validation against examples from the literature, numerical simulations are performed, presenting a phase-field strategy capable to describe the cover cracking of corroded RC beams. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: reinforced concrete; corrosion; cracking; phase field. 1. Introduction Corrosion of the reinforcement bar (rebar) is one of the most common and dangerous deterioration mechanisms in reinforced concrete (RC) structures (Rodrigues et al., 2021). The progressive degradation of the material properties rr si f steel rei f rce e t ars is a cr cial iss e f r t e rei f rce c crete str ct res. ei e f t e st c eteri rati ec a is s, c rr si se erel affects t e ser icea ilit a ra ilit f t e str ct re as t e steel rei f rce e t s ffers fr a re cti f t e cr ss secti a eteri rati f t e ec a ical r erties. iti all , e t t e steel i ati r cess, resi al aterial is f r e , a t e l e cc ie t e rei f rce e t i creases, lea i t crac i a s alli f t e c crete c er. re icti e el c li c crete car ati r cess a ase-fiel a r ac f r rittle fract res is r se t si late t e car ati i ce c rr si f re ar a t e s se e t crac i e e . irst, a ic iff si la is se t escri e t e car i i e ( 2 ) iff si it i t e c crete ic lea s t a e eralize c rr si r cess. s t e c rr si e l es, t e steel ass l ss is c erte i t e a si strai e t t e f r ati f resi al aterial, a t e a a e e l ti it i t e c crete c er is eter i e . fter ali ati a ai st e a les fr t e literat re, erical si lati s are erf r e , rese ti a ase-fiel strate ca a le t escri e t e c er crac i f c rr e ea s. e t rs. lished I . . This is an open access article under the CC BY-NC-ND license (https://creativecom s. r /lice ses/ - c- / . ) eer-re ie tate e t: Peer-re ie er res si ilit f t e scie tific c ittee f t e I ey ords: reinforced concrete; corrosion; cracking; phase field. . I t ti rr si f t r i f r t r (r r) is f t st r s t ri r ti is s i r i f r r t ( ) str t r s ( ri s t l., ). r r ssi r ti f t t ri l r rti s IGF26 - 26th International Conference on Fracture and Structural Integrity Phase-field simulations of cover cracking in corroded RC beams Francesco Freddi a , Lorenzo Mingazzi a * Departmend of Engineering and Architecture, Università degli Studi di Parma, Parco Area delle Scienze 181/A, Parma, 43124, Italy - t I t r ti l f r r t r tr t r l I t rit i a , Lore i i a epart end of ngineering and rchitecture, niversità degli Studi di ar a, arco rea delle Scienze 181/ , ar a, 43124, Italy I str ct

* Corresponding author. E-mail address: lorenzo.mingazzi@unipr.it * orresponding author. - ail address: lorenzo. ingazzi unipr.it

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 2021 he uthors. ublished by I . . his is an open access article under the - - license (https://creativeco ons.org/licenses/by-nc-nd/4.0) eer-revie tate ent: eer-revie under responsibility of the scientific co ittee of the I x o

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.045