Competitive nature of alkali-silica fume and alkali–aggregate (silica) reaction

Autor:	J. E. Gillott, H. Wang
Rok vydání:	1992
Předmět:	Cement Aggregate (composite) Silica fume Chemical engineering Chemistry General Materials Science Building and Construction Pozzolan Alkali metal Expansive Civil and Structural Engineering
Zdroj:	Magazine of Concrete Research. 44:235-239
ISSN:	1751-763X 0024-9831
DOI:	10.1680/macr.1992.44.161.235
Popis:	Silica fume is an effective pozzolan in controlling alkali-aggregate (silica) reactionwhen used in appropriate amounts as a cement replacement. The experiments described in this Paper showed that silica fume reacts in a similar way to alkali-expansive opal with CaOH)2 and/or NaOH. Pastes of silica fume and Ca(OH)2, silica fume and NaOH, and silica fume and Ca(OH)2 plus NaOH showed the same expansive properties as corresponding pastes made with opal and these three alkalis. The role of silica fume in controlling alkali-aggregate (silica) reaction is attributed to a competitive reaction between alkali-silica fume and alkali-aggregate (silica) reactions.
Databáze:	OpenAIRE
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