Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Alkali-Silica Reaction (ASR) Detection in Concrete from Frequency Dependent Ultrasonic Attenuation
The alkali-silica reaction (ASR) occurs between the reactive aggregates and the alkaline cement paste in concrete, eventually producing damage such as swelling and cracking. This research uses mechanical tests and ultrasonic tests to detect ASR onset in concrete specimens. The test specimens are fabricated in pairs, one specimen typically subjected to an accelerated ASR environment (immersion in 1 N NaOH solution at 80°C) and the second specimen comparable but not exposed to the accelerated ASR environment. In mechanical tests, the transverse and longitudinal resonant frequencies are measured. Results show that ASR damage would lower the resonant frequencies. In the ultrasonic test, broadband excitations are used and pitch-catch records are obtained. The presence of ASR damage in concrete is shown to cause frequency dependent ultrasonic attenuation. Signals from ASR damaged specimens show strong attenuation at high frequencies and weak attenuation at low frequencies. In contrast, signals frompaired non-ASR specimens show comparable energy over the entire range of measured frequencies. The cumulative distribution function of frequency components (CDF) is used to characterize the ultrasonic passband changes caused by ASR damage and detect the existence of ASR damage in frequency domain.
Alkali-Silica Reaction (ASR) Detection in Concrete from Frequency Dependent Ultrasonic Attenuation
The alkali-silica reaction (ASR) occurs between the reactive aggregates and the alkaline cement paste in concrete, eventually producing damage such as swelling and cracking. This research uses mechanical tests and ultrasonic tests to detect ASR onset in concrete specimens. The test specimens are fabricated in pairs, one specimen typically subjected to an accelerated ASR environment (immersion in 1 N NaOH solution at 80°C) and the second specimen comparable but not exposed to the accelerated ASR environment. In mechanical tests, the transverse and longitudinal resonant frequencies are measured. Results show that ASR damage would lower the resonant frequencies. In the ultrasonic test, broadband excitations are used and pitch-catch records are obtained. The presence of ASR damage in concrete is shown to cause frequency dependent ultrasonic attenuation. Signals from ASR damaged specimens show strong attenuation at high frequencies and weak attenuation at low frequencies. In contrast, signals frompaired non-ASR specimens show comparable energy over the entire range of measured frequencies. The cumulative distribution function of frequency components (CDF) is used to characterize the ultrasonic passband changes caused by ASR damage and detect the existence of ASR damage in frequency domain.
Alkali-Silica Reaction (ASR) Detection in Concrete from Frequency Dependent Ultrasonic Attenuation
Gong, Peng (Autor:in) / Patton, Mark E. (Autor:in) / Greve, David W. (Autor:in) / Harley, Joel B. (Autor:in) / Liu, Chang (Autor:in) / Oppenheim, Irving J. (Autor:in)
2013
8 Seiten, Bilder, Tabellen, 15 Quellen
Aufsatz (Konferenz)
Englisch
Measurement of alkali–silica reaction progression by ultrasonic waves attenuation
| British Library Online Contents | 2007
Measurement of alkali-silica reaction progression by ultrasonic waves attenuation
| Tema Archiv | 2007
An investigation of frequency-dependent ultrasonic attenuation in concrete
| Tema Archiv | 1995
An Investigation of Frequency-Dependent Ultrasonic Attenuation in Concrete
| British Library Conference Proceedings | 1995