PSI - Issue 46

ScienceDirect Structural Integrity Procedia 00 (2021) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 46 (2023) 112–118

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

© 2023 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 ICSID 2021 Organizers Abstract Reinforced concrete (RC) has been the most frequently used structural material for about a century, with prestressed and precast concrete technology being widely applied in bridges for overcoming large spans. The two main investigated causes of aging and degradation of concrete structures are the reinforcement corrosion and the reduction in alkalinity of concrete due to atmospheric carbon dioxide, especially in presence of chlorides. While the social and ecological relevance of unbiased assessment and prediction of concrete structure's serviceability remains beyond question, a comprehensive scope of the mid-20th century scientific literature, and of more recent research trends, reveals controversial views between past and present on the expected engineering serviceability life of concrete structures. These are due to chemical deterioration factors, associated with environmental exposure, in particular, concerning rebar corrosion and a possible related detrimental interaction with atmospheric CO 2 . To understand some of these elements of controversy between past and present paradigms on concrete durability, carbonation, and selection criteria of testing methods for durability assessment, an experimental campaign was carried out for evaluating the extent of carbonation and degradation underwent by a precast RC column which remained fully exposed to weathering actions during 20 years. The campaign included partially destructive tests with different degrees of invasiveness and included non-destructive electrochemical tests. The present contribution reports the results that permit to draw considerations on a hierarchy of diagnostic reliability in the evaluation of R/C degradation, in which concrete core sampling plays the role of golden standard . © 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 ICSID 2021 Organizers. Keywords: RC degradation; inspecting methods; testing methods; testing reliability hierarchy; golden standard. 5th International Conference on Structural Integrity and Durability Diagnostic reliability in the evaluation of degradation and carbonation in a pre-cast column after 20-year weathering Roberto Serpieri a *, Antonio Bossio b , Giuseppe Faella a , Giorgio Frunzio a , Mariateresa Guadagnuolo a a Dipartimento di Architettura e Disegno Industriale, University of Campania “Luigi Vanvitelli”, Aversa, Italy b University of Naples “Federico II”, Naples, Italy Abstract Reinforced concrete (RC) has been the most frequently used structural material for about a century, with prestressed and precast concrete technology being widely applied in bridges for overcoming large spans. The two main investigated causes of aging and degradation of concrete structures are the reinforcement corrosion and the reduction in alkalinity of concrete due to atmospheric carbon dioxide, especially in presence of chlorides. While the social and ecological relevance of unbiased assessment and prediction of concrete structure's serviceability remains beyond question, a comprehensive scope of the mid-20th century scientific literature, and of more recent research trends, reveals controversial views between past and present on the expected engineering serviceability life of concrete structures. These are due to chemical deterioration factors, associated with environmental exposure, in particular, concerning rebar corrosion and a possible related detrimental interaction with atmospheric CO 2 . To understand some of these elements of controversy between past and present paradigms on concrete durability, carbonation, and selection criteria of testing methods for durability assessment, an experimental campaign was carried out for evaluating the extent of carbonation and degradation underwent by a precast RC column which remained fully exposed to weathering actions during 20 years. The campaign included partially destructive tests with different degrees of invasiveness and included non-destructive electrochemical tests. The present contribution reports the results that permit to draw considerations on a hierarchy of diagnostic reliability in the evaluation of R/C degradation, in which concrete core sampling plays the role of golden standard . © 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 ICSID 2021 Organizers. Keywords: RC degradation; inspecting methods; testing methods; testing reliability hierarchy; golden standard. 5th International Conference on Structural Integrity and Durability Diagnostic reliability in the evaluation of degradation and carbonation in a pre-cast column after 20-year weathering Roberto Serpieri a *, Antonio Bossio b , Giuseppe Faella a , Giorgio Frunzio a , Mariateresa Guadagnuolo a a Dipartimento di Architettura e Disegno Industriale, University of Campania “Luigi Vanvitelli”, Aversa, Italy b University of Naples “Federico II”, Naples, Italy

* Corresponding author. Tel.: +39-339-1991634; fax: +39-0815010704. E-mail address: roberto.serpieri@unicampania.it * Corresponding author. Tel.: +39-339-1991634; fax: +39-0815010704. E-mail address: roberto.serpieri@unicampania.it

2452-3216 © 2023 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 ICSID 2021 Organizers 10.1016/j.prostr.2023.06.019 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 ICSID 2021 Organizers 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 ICSID 2021 Organizers