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Relation between crack opening and extent of the damage induced at the steel/mortar interface

  • Cracks are inevitable in reinforced concrete structures and promote the diffusion of aggressive agents towards the reinforcement. In Eurocodes, for some exposure conditions, a threshold not to be exceeded for crack width near the rebar is recommended in order to limit risks of corrosion development and ensure structure durability. On the other hand, several studies show that the steel/mortar interface quality at the intersection with a crack strongly influences corrosion development. The aim of this study was therefore to test whether a relation exists between the extent of mechanical damage at the interface and the corresponding residual crack opening. To this end, specimens were cracked using three point bending test apparatus and the evolution of crack opening was determined on the outer surface and deep within the specimen. It was observed that the crack opening measured on the outer surface of the specimen was very close to that measured at various depths within the specimen atCracks are inevitable in reinforced concrete structures and promote the diffusion of aggressive agents towards the reinforcement. In Eurocodes, for some exposure conditions, a threshold not to be exceeded for crack width near the rebar is recommended in order to limit risks of corrosion development and ensure structure durability. On the other hand, several studies show that the steel/mortar interface quality at the intersection with a crack strongly influences corrosion development. The aim of this study was therefore to test whether a relation exists between the extent of mechanical damage at the interface and the corresponding residual crack opening. To this end, specimens were cracked using three point bending test apparatus and the evolution of crack opening was determined on the outer surface and deep within the specimen. It was observed that the crack opening measured on the outer surface of the specimen was very close to that measured at various depths within the specimen at the same height level. In addition, the length of the mechanically damaged interface was determined for each residual crack opening. It was deduced that cracks induced significant steel/mortar Interface damage independently of the size of their openings. The length of the mechanically damaged interface increased proportionally to the residual crack opening without showing marked variation after a certain crack opening value. Based on the observed results, it is deduced that defining thresholds on crack openings is logical for esthetic reasons but is not articularly relevant for corrosion risk assessment.zeige mehrzeige weniger

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Metadaten
Autor*innen:R.M. Ghantous, R. François, S. Poyet, V. L’hostis, F. Bernachy-Barbe, Dietmar Meinel, L. Portier, N.-C. Tran
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Construction and Building Materials
Jahr der Erstveröffentlichung:2018
Organisationseinheit der BAM:8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.5 Röntgenbildgebung
Verlag:Elsevier Ltd.
Verlagsort:Oxford, GB
Jahrgang/Band:193
Erste Seite:97
Letzte Seite:104
Freie Schlagwörter:Cracks; Load-induced damage; Micro-CT; Reinforced concrete
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Material
Material / Degradation von Werkstoffen
DOI:10.1016/j.conbuildmat.2018.10.176
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.11.2018
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:02.01.2019
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