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Erschienen in:
2024 | OriginalPaper | Buchkapitel
Applying the Multi-level Assessment to a Bridge in Service Affected by ASR and DEF in Brazil
verfasst von : Cassandra Trottier, Diego Jesus De Souza, Mayra De Grazia, José Eduardo de Aguiar, Jayme Kneip Neto, Leandro F. M. Sanchez
Erschienen in: Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete
Verlag: Springer Nature Switzerland
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Abstract
The 043-FA concrete bridge in Brazil was built using aggregates susceptible to alkali-silica reactive (ASR), exposed to conditions enabling the development of delayed ettringite formation (DEF) and is still in service. Over the years, many signs of deterioration developed on various structural elements of the bridge, mostly in the foundation blocks and concrete columns. As such, cores were extracted from the structural concrete elements following in-situ inspections. Therefore, this work presents results from the multi-level condition assessment using the damage rating index (DRI) and the stiffness damage test (SDT) to determine the cause and extent of the damage to the concrete due to ASR coupled with DEF. Consequently, elements show a moderate degree of damage (i.e., 0.10–0.15% expansion) except for one foundation block (i.e., B02 at 0.25–0.30% expansion), which displayed an advanced damage level, thus indicating the bridge’s non-conformity to Brazilian safety protocols.