Effect of Treatment of Reactive Aggregate by H2O2 on the Alkali-Silica Reaction

A method of controlling the alkali‐silica reaction by treating a reactive aggregate with a solution of hydrogen peroxide was investigated. Mortar bars made using the hydrogen peroxide‐treated aggregate exhibited no expansion after 12 months, indicating that the alkali‐silica reaction was suppressed....

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Veröffentlicht in:	Journal of the American Ceramic Society 1994-06, Vol.77 (6), p.1522-1524
Hauptverfasser:	Hibino, Takeshi, Tsuyuki, Naomitsu, Ishida, Hideki
Format:	Artikel
Sprache:	eng
Schlagworte:	Aggregates and other concrete constituents Applied sciences Buildings. Public works Cement concrete constituents Exact sciences and technology Materials
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Beschreibung
Zusammenfassung:	A method of controlling the alkali‐silica reaction by treating a reactive aggregate with a solution of hydrogen peroxide was investigated. Mortar bars made using the hydrogen peroxide‐treated aggregate exhibited no expansion after 12 months, indicating that the alkali‐silica reaction was suppressed. Study of the state of bonding of Si in the aggregate using XPS showed that the Si‐O bond energy indicating glassy SiO2 (102.7 eV) before treatment had changed to crystalline SiO2 (103.2 eV) after hydrogen peroxide treatment. This indicates that the strong oxidizing potential of hydrogen peroxide stabilizes the silica in the reactive aggregate and thus suppresses the alkali‐silica reaction.
ISSN:	0002-7820 1551-2916
DOI:	10.1111/j.1151-2916.1994.tb09751.x