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Non-invasive investigation of concrete deterioration in aggressive aqueous environments by means of neutron diffraction

Schwotzer, Matthias; Bogner, Andreas; Kaltenbach, Jonas; Scheffzük, Christian

Abstract (englisch):
Maximizing the service life of concrete structures is an important challenge in the context of a sustainable development in the construction sector. However, an improvement of the durability of cement-based materials requires a detailed knowledge of the mechanisms of relevant deterioration reactions. In particular, the related mechanisms due to an impact of aqueous solutions are still debatable. Here, an interplay of transport processes and reactions disturb the equilibria between solid phases and the solutions in the pore structure of the materials resulting in significant changes in the mineralogical composition. In the medium and long term, these processes lead to serious damages to construction materials. Investigations of the damaging reactions are, however, usually “invasive” and therefore only suitable to a limited extent to characterize the relevant in situ processes. In this context, neutron diffraction appears to be a promising tool for time-resolved monitoring of the reactions of crystalline compounds in mineral-bound materials. So, non-destructive measurements can be performed on defined volume elements. In this study, investigation concepts were developed for different scenarios of chemical attacks relevant to practice. ... mehr



Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Funktionelle Grenzflächen (IFG)
Materialprüfungs- und Forschungsanstalt Karlsruhe (MPA)
Publikationstyp Vortrag
Publikationsdatum 23.09.2019
Sprache Englisch
Identifikator KITopen-ID: 1000100427
HGF-Programm 34.15.01 (POF III, LK 01) Mineralische Konstruktionsmaterialien
Veranstaltung GeoMünster (2019), Münster, Deutschland, 22.09.2019 – 25.09.2019
Schlagwörter durability, concrete, non-invasive investigation, neutron diffraction
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