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Electron-microanalytical investigations of the interfacial corrosion in concrete

Elektronen-mikroanalytische Untersuchungen der Grenzflächenkorrosion von Beton

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Zusammenfassung

Bei der sauren Korrosion von Beton werden die für die Zugfestigkeit bedeutsamen Zement-Zuschlaggrenzflächen bevorzugt angegriffen. Für deren Charakterisierung eignet sich am besten die TEM(STEM)-EDS-Analyse von Abreißreplicaproben dieser Grenzflächen. Die erreichte hohe Spezifität und Selektivität wird mit dem (vertretbaren) Nachteil eher geringer Repräsentativität erkauft, welcher aber durch Anwendung von Ergänzungsverfahren wie REM oder Mikrosonde weitgehend aufgewogen werden kann.

Die Analyse der aufgrund ihrer Haftfestigkeit separierten Grenzflächenphasen ermöglicht Rückschlüsse auf saure Korrosionsmechanismen.

Summary

Acid corrosion of concrete is of significant importance in respect of the binding forces exerted between cement and aggregate. The characterization of the interface phases responsible for flexural strength is only possible by separation (rupture). The revealed zones can be prepared for TEM(STEM)/EDS-analysis by tear-off replication. Thereby a selection of interfacial layers is performed with respect to their bonding strength. Supplementary SEM or microprobe analysis of larger interface areas can be performed for reasons of representativity, they are, however, unable to characterize quantitatively those thin layers, which are of highest importance for concrete strength.

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Authors and Affiliations

  1. Institut für Analytische Chemie, Technische Universität, Getreidemarkt 9, A-1060, Wien, Austria

    E. Hoke, P. Wilhartitz, M. Grasserbauer & G. Eder

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  1. E. Hoke
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  2. P. Wilhartitz
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  3. M. Grasserbauer
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  4. G. Eder
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Hoke, E., Wilhartitz, P., Grasserbauer, M. et al. Electron-microanalytical investigations of the interfacial corrosion in concrete. Z. Anal. Chem. 318, 124–128 (1984). https://doi.org/10.1007/BF00533681

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  • DOI: https://doi.org/10.1007/BF00533681

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