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 ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 37 (2022) 644–651

© 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 Nowadays, delayed ettringite formation, DEF, still constitutes one of the main causes of concrete degradation in massive concrete elements or structures in Portugal. The most effective way to prevent the deleterious development of DEF is to control the maximum temperature attained during concrete cure. The tools currently available to practitioners, for predicting the maximum temperature attained in a concrete element, require the previous knowledge of the heat of hydration of the cement to be used in the structure. Several methods can be used to determine it, although the most common has been the Lagavant method, i.e. by means of semi adiabatic calorimetry, the isothermal conduction calorimetry method is now becoming a widely used method. Since the two test methods produce different values, it is important to establish a correlation between the results obtained with both and to determine their influence on the temperature estimate made with the currently available calculation tools. The laboratory and in-situ tests reported in this paper allowed to gather a relevant amount of data pertaining to the heat of hydration of cement types normally used on massive structures or structures with massive elements, with the two abovementioned standardized methods; to establish a correlation on the heat of hydration values obtained with the two methods; and to use those heat of hydration values to perform estimates of the maximum temperature attained during concrete cure of a particular concrete mixture, used in a real structural element, which were very close to those measured experimentally on an experimental concrete viaduct deck section. © 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 Keywords: Concrete; Delayed ettringite formation; Temperature; Durability. ICSI 2021 The 4th International Conference on Structural Integrity Estimation of maximum temperature attained during concrete cure for internal sulfate reaction prevention in structures João Custódio a, *, Manuel Vieira a , António Mesquita b , Rodrigo Santos b , António Bettencourt Ribeiro a a LNEC – Laboratório Nacional de Engenharia Civil, Av. do Brasil, 101, 1700-066 Lisboa, Portugal b CIMPOR, Avenida José Malhoa, n.º 22 - Pisos 6 a 11, 1099-020 Lisboa, Portugal Abstract Nowadays, delayed ettringite formation, DEF, still constitutes one of the main causes of concrete degradation in massive concrete elements or structures in Portugal. The most effective way to prevent the deleterious developmen of DEF is t co trol the maximum temp rature attained during concrete cure. The tools currently available to practition rs, for predicting the maximum t perat re attained in a concr te element, require the previ us knowledge of the heat of hydration of the ceme t to be used in th structure. Several methods can be us d to determin it, although the most common has been the Lagavant meth d, i.e. by means of semi adiab tic calorimetry, the isothermal co duction calorimetry meth d is ow becoming a widely used method. Sinc the two test methods produce different valu s, it is important to establish a correlat o betw en the results obtain with both a d to determine th ir influence on the t mperature esti ate made with the currently available calculation o ls. The laborat ry in-situ tests reported in this paper allowed to gather a relevant amount of data pertaining to the heat of hydration of cement types normally used on massive structures or structures with massive elements, with the two abov m n i ned st ndardiz d methods; t establish a correl tion on the h at f hydration values obtained with the two m thods; and to use those heat of hy ration values to perform estimates of the maximum temperature attained during concrete cure f a particular concr te mixture, used in a r al structu al le ent, whic were very close to thos me sured experimentally on an experiment l concrete viaduct deck section. © 2022 The Autho s. 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 Keywords: Concrete; Delayed ettringite formation; Temperature; Durability. ICSI 2021 The 4th International Conference on Structural Integrity Estimation of maximum temperature attained during concrete cure for internal sulfate reaction prevention in structures João Custódio a, *, Manuel Vieira a , António Mesquita b , Rodrigo Santos b , António Bettencourt Ribeiro a a LNEC – Laboratório Nacional de Engenharia Civil, Av. do Brasil, 101, 1700-066 Lisboa, Portugal b CIMPOR, Avenida José Malhoa, n.º 22 - Pisos 6 a 11, 1099-020 Lisboa, Portugal

* 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.2022.01.133