PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 37 (2022) 590–597

© 2022 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 Pedro Miguel Guimaraes Pires Moreira Abstract The detection of concrete structures affected by Alkali-Silica Reaction (ASR) has increased dramatically over the past couple of decades in Portugal. Due to the complexity and multiplicity of factors involved in ASR together with the variability of the materials used, no International or European standards exist for assessing the aggregates potential alkali-reactivity, and each country must rely on national regulations or specifications. Because of that, in Portugal, LNEC Specification E 415 was prepared in 1993 and LNEC Specification E 461 was introduced in 2004 and revised in 2007. However, due to the scientific developments occurred since then, new revised versions were prepared and will soon be published. Although, LNEC Specifications provide guidance on the identification of potentially alkali-silica reactive aggregates, there are still some knowledge gaps on how to reliably assess the potential reactivity of some minerals present in granites and similar rocks, which are the type of aggregate most used in large concrete structures in Portugal. Therefore, to contribute to the current ongoing discussion on the role of the main components of these rocks on ASR development, this paper presents the methodology that was applied in the evaluation of concrete granitic aggregates used in recently built hydroelectric projects as well as in a dam constructed abroad several decades ago, and in which the deleterious development of ASR was detected 15 years after construction. © 2022 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) ICSI 2021 The 4th International Conference on Structural Integrity Assessment of potential alkali-silica reactivity of aggregates for concrete João Custódio a, *, Dória Costa a , António Bettencourt Ribeiro a , António Santos Silva a a LNEC – Laboratório Nacional de Engenharia Civil, Av. do Brasil, 101, 1700-066 Lisboa, Portugal Abstract The detection of concrete structures affected by Alkali-Silica Reaction (ASR) has increased dramatically over the past couple of deca s in Portugal. Due to he complexity and multip city of factors i volved in ASR together with the variabili y of the materials used, no International or European standards exist for assessing he aggregates potential alkali-reac ivity, and each country must rely o national regulations or specification . Because of that, in Portu al, LNEC Specification E 415 was prep red in 1993 and LNEC Specification E 461 wa introduced in 2004 and revised in 2007. However, due to the scientific developments occurre since then, new revised version were prepared and will soon be published. Although, LNEC Specifications pr vide guidance on the identification of potentially alkali-silica active aggregates, there are still some knowledge gaps on h w to reliably assess the potential reactivity of some miner s present in granites and imilar rocks, which are th type of aggregate most used in larg c ncrete stru tures in P rtugal. Therefo , to contribut to the current ngoing discussion on the role of the main components of these rocks on ASR development, this paper presents the m thodology that was applied i evaluation of concrete granitic aggr gates used in recently built hydroelectric oj c as well as in a dam constructed abroad s v r decades ag , and in which the d le rious evelopment of ASR was dete ted 15 ye rs after co struction. © 2022 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 u der re ponsibility of Pedro Miguel Guimara s Pires Moreira Keywords: Concrete; Aggregates; Alkali-Silica Reaction; Alkali Reactivity; Durability. ICSI 2021 The 4th International Conference on Structural Integrity Assessment of potential alkali-silica reactivity of aggregates for concrete João Custódio a, *, Dória Costa a , António Bettencourt Ribeiro a , António Santos Silva a a LNEC – Laboratório Nacional de Engenharia Civil, Av. do Brasil, 101, 1700-066 Lisboa, Portugal Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Concrete; Aggregates; Alkali-Silica Reaction; Alkali Reactivity; Durability.

* Corresponding author. Tel.: +351218443246; fax: 351218443023. E-mail address: jcustodio@lnec.pt * Corresponding author. Tel.: +351218443246; fax: 351218443023. E-mail address: jcustodio@lnec.pt

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira

2452-3216 © 2022 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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.127