• search hit 17 of 48
Back to Result List

Interactions of chemical and physical parameters of aggregate grains for a better understanding of alkalisilca-reaction

  • Mortar bar and concrete prism tests are the most commonly used methods for the evaluation of alkali-silica reactivity (ASR). Despite their widespread use, both methods have significant drawbacks. The largest issue is that neither test is a direct measurement of the aggregate. Matrix effects from the mortar or concrete, or variations in the individual non-aggregate materials can influence the outcome. This paper describes fundamental results as the basis for the chemical and physical test method (BTU-SP test) directly carried out at aggregate grains. Additional methods (BET, microscopy) confirm that not only the aluminate from the aggregate controls the silica release but also the pore structure inside of rocks (i.e. voids, cracks) buffer the swelling potential of the formed alkali-silica gel. As a result a reaction model describing the interactions of chemical and physical parameters in 4 phases has been developed for an alkalisilica reaction.

Export metadata

Additional Services

Search Google Scholar
Metadaten
Author: Robert Bachmann, Klaus-Jürgen HüngerGND
URL:https://www-docs.b-tu.de/fg-baustoffe/public/006_021811-BACH.pdf
Title of the source (English):ICAAR, 14th International Conference on Alkali Aggregate Reaction, May 20-25, 2012, Austin, TX
Document Type:Conference Proceeding
Language:English
Year of publication:2012
Tag:4 phases model; BTU-SP test; alumino silicate formation; open porosity; silica release
Number of pages:10
Faculty/Chair:Fakultät 6 Architektur, Bauingenieurwesen und Stadtplanung / FG Baustoffe und Bauchemie
Einverstanden ✔
Diese Webseite verwendet technisch erforderliche Session-Cookies. Durch die weitere Nutzung der Webseite stimmen Sie diesem zu. Unsere Datenschutzerklärung finden Sie hier.