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Chloride ingress in cracked concrete studied using laser induced breakdown spectroscopy

  • Cracks are always present in reinforced concrete structures. In the presented research, influence of mechanical cracks on chloride ingress is studied. A compact reinforced concrete specimen was designed, mimicking the cracking behaviour of beam elements. Cracks of different widths were induced by means of mechanical loading. These cracked specimens were then subjected to weekly cycles of wetting and drying with NaCl solution. After the exposure, the specimens were cut, and chloride distributions were determined using Laser Induced Breakdown Spectroscopy (LIBS), an innovative technique which enables simultaneous determination of different elements with high spatial resolution and minimal specimen preparation. By combining element distributions of different elements, it is possible to discriminate between coarse aggregate particles, and the mortar matrix. It was found that the wider the crack is, the higher the ingress of chloride ions. This was, however, different for two testedCracks are always present in reinforced concrete structures. In the presented research, influence of mechanical cracks on chloride ingress is studied. A compact reinforced concrete specimen was designed, mimicking the cracking behaviour of beam elements. Cracks of different widths were induced by means of mechanical loading. These cracked specimens were then subjected to weekly cycles of wetting and drying with NaCl solution. After the exposure, the specimens were cut, and chloride distributions were determined using Laser Induced Breakdown Spectroscopy (LIBS), an innovative technique which enables simultaneous determination of different elements with high spatial resolution and minimal specimen preparation. By combining element distributions of different elements, it is possible to discriminate between coarse aggregate particles, and the mortar matrix. It was found that the wider the crack is, the higher the ingress of chloride ions. This was, however, different for two tested concrete mixes. Due to highly inhomogeneous chloride distribution around the cracks, use of fine-scale experimental techniques for chloride mapping is advised, based on the presented study.zeige mehrzeige weniger

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Metadaten
Autoren/innen:B. Savija, J. Pacheco, E. Schlangen, Steven Millar, Thorsten Eichler, Gerd Wilsch
Persönliche Herausgeber/innen:K. Van Breugel, E.A.B. Koenders
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):AMS 14 - Ageing of materials & structures - Proceedings of the 1st ageing of materials & structures 2014 conference
Jahr der Erstveröffentlichung:2014
Organisationseinheit der BAM:8 Zerstörungsfreie Prüfung
8 Zerstörungsfreie Prüfung / 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen
Herausgeber (Institution):TU Delft
Erste Seite:140
Letzte Seite:146
Freie Schlagwörter:Chloride ingress; Concrete cracking; LIBS
Veranstaltung:1st Ageing of materials & structures 2014 conference
Veranstaltungsort:Delft, The Netherlands
Beginndatum der Veranstaltung:26.05.2014
Enddatum der Veranstaltung:28.05.2014
ISBN:978-94-6186-313-3
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein