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Characterization of alkali-silica reaction in concrete specimens using a nonlinear vibration technique
A nonlinear vibration technique has been developed for the nondestructive characterization of damage introduced by alkali-silica reactions (ASR) in concrete. The response of a concrete specimen to increasing impact load is analyzed to obtain a relationship between the amplitude of the response and the resonance frequency, and thus the nonlinearity of the specimen. As commonly observed in nonlinear hysteretic materials, the resonance frequency of a specimen decreases with an increasing level of excitation strain. Concrete is a nonlinear hysteretic material to begin with, but the progress of the alkali-silica reaction causes an increase in nonlinearity through the formation of expansive ASR gel and the resulting microcracks. This increase in material nonlinearity is measured with the aforementioned procedure. The specimens used in the research are of varying reactivity with respect to ASR, which is induced in accordance with ASTM C 1293. The results show a substantial difference in nonlinearity between samples with highly reactive aggregate, and those with a non-reactive one. Complementary expansion measurements are also performed to independently verify the reactivity of the aggregate used. These results show that the developed nonlinear vibration technique has the potential to characterize the amount of ASR-induced damage in concrete.
Characterization of alkali-silica reaction in concrete specimens using a nonlinear vibration technique
A nonlinear vibration technique has been developed for the nondestructive characterization of damage introduced by alkali-silica reactions (ASR) in concrete. The response of a concrete specimen to increasing impact load is analyzed to obtain a relationship between the amplitude of the response and the resonance frequency, and thus the nonlinearity of the specimen. As commonly observed in nonlinear hysteretic materials, the resonance frequency of a specimen decreases with an increasing level of excitation strain. Concrete is a nonlinear hysteretic material to begin with, but the progress of the alkali-silica reaction causes an increase in nonlinearity through the formation of expansive ASR gel and the resulting microcracks. This increase in material nonlinearity is measured with the aforementioned procedure. The specimens used in the research are of varying reactivity with respect to ASR, which is induced in accordance with ASTM C 1293. The results show a substantial difference in nonlinearity between samples with highly reactive aggregate, and those with a non-reactive one. Complementary expansion measurements are also performed to independently verify the reactivity of the aggregate used. These results show that the developed nonlinear vibration technique has the potential to characterize the amount of ASR-induced damage in concrete.
Characterization of alkali-silica reaction in concrete specimens using a nonlinear vibration technique
Charakterisierung der Alkali-Slika-Reaktion in Betonproben mittels nichtlinearer Schwingungstechnik
Lesnicki, Krzysztof J. (Autor:in) / Kim, Jin-Yeon (Autor:in) / Kurtis, Kimberly (Autor:in) / Jacobs, Laurence J. (Autor:in)
2011
8 Seiten, 7 Bilder, 1 Tabelle, 13 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Alkali-Silica Reaction in Concrete
| NTIS | 1985
Alkali-silica reaction in concrete
Emerald Group Publishing | 1999
Alkali-silica Reaction in concrete
| TIBKAT | 1988
Alkali-silica reaction in concrete
| UB Braunschweig | 1988