A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Durability of ultrahigh-performance concrete
The aim of this study was to evaluate the durability of different UHPC (ultra high performance concrete) mixtures regarding ASR (alkali-silica reaction) and DEF (delayed-ettringite formation). UHPC prisms were exposed to different temperature and moisture conditions in a special climate simulation chamber. SEM (scanning electron microscopy) was used to determine possible deterioration of UHPCs. Results of microscopic investigations show that products of ASR are only locally enriched. An ettringite growth was observed on microcracks (< 10 microns) in intentional pre-damaged samples or close to incompletely hydrated clinker grains. Macroscopic deteriorations due to ASR or ettringite growth could not be detected. However, steel fibers of UHPC were affected by corrosion.
Durability of ultrahigh-performance concrete
The aim of this study was to evaluate the durability of different UHPC (ultra high performance concrete) mixtures regarding ASR (alkali-silica reaction) and DEF (delayed-ettringite formation). UHPC prisms were exposed to different temperature and moisture conditions in a special climate simulation chamber. SEM (scanning electron microscopy) was used to determine possible deterioration of UHPCs. Results of microscopic investigations show that products of ASR are only locally enriched. An ettringite growth was observed on microcracks (< 10 microns) in intentional pre-damaged samples or close to incompletely hydrated clinker grains. Macroscopic deteriorations due to ASR or ettringite growth could not be detected. However, steel fibers of UHPC were affected by corrosion.
Durability of ultrahigh-performance concrete
Dauerhaftigkeit von Ultrahochleistungsbeton
Pfeifer, C. (author) / Möeser, B. (author) / Giebson, C. (author) / Stark, J. (author)
2009
16 Seiten, 13 Bilder, 4 Tabellen, 23 Quellen
Conference paper
English
Dauerhaftigkeit , Ultrahochleistungsbeton , Alkali-Silica-Reaktion , Wasserabbinden von Zement , Calciumaluminatsulfathydrat , Rasterelektronenmikroskopie , Mikrostruktur , Werkstoffgefüge , stahlfaserverstärkter Beton , Betonkorrosion , Mikroriss , Silicafeinststaub , Frost-Tau-Test , Klimabeständigkeit
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