Filtern
Erscheinungsjahr
Dokumenttyp
- Beitrag zu einem Tagungsband (46) (entfernen)
Sprache
- Englisch (32)
- Deutsch (13)
- Mehrsprachig (1)
Schlagworte
- Baustoffe (6)
- Building materials (6)
- Earth block masonry (4)
- Autogenes Schwinden (3)
- Building Materials (3)
- Earthen materials (3)
- UHPC (3)
- Ultra-high performance concrete (3)
- Anchor pins (2)
- Artificial weathering (2)
Industrial byproducts and natural pozzolanas are increasingly being used as supplementary cementitious materials. In the group of natural pozzolanas volcanic ashes are the most prominent. Despite the fact that volcanic pozzolanas were used since Roman times, not much is known about their role in influencing the long term durability of concrete. The paper presents results of the volcanic pozzolana ‘Rhenish trass’, which is quarried in western Germany and its role during an alkali silica reaction (ASR). Field data and laboratory experiments indicate that trass releases alkalis into the pore solution but also changes cement paste chemistry and alkali binding behavior. There seems to be a sensitive balance between alkali release and increase of alkali binding capacity, both mechanisms crucial for the course of an ASR in concrete.