Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Air voids size distribution determined by ultrasonic attenuation
Highlights An ultrasonic method to determine the air voids size distribution is proposed. The measured ultrasonic wave attenuation increases with the amount of air voids. The size distribution of air voids affects the wave frequency-attenuation curve. The maximum likelihood for the air voids size distribution is log-normal distribution. We compare the results obtained by the proposed method and the microscopical determination.
Abstract Voids in cement-based materials influence their material properties. While air voids within a certain range are beneficial for freezing-and-thawing resistance, large-size voids decreases strength and durability. This paper proposes a method to quantify the air voids size distribution, which use the concept of ultrasonic wave attenuation. The wave attenuation increases with the inclusion of air voids. Its measurement is compared with a theoretical model, and then three-dimensional information of air voids can be obtained. An application example of cement paste is presented and the results are discussed with the measurement of permeable pores and the result of a microscopical determination.
Air voids size distribution determined by ultrasonic attenuation
Highlights An ultrasonic method to determine the air voids size distribution is proposed. The measured ultrasonic wave attenuation increases with the amount of air voids. The size distribution of air voids affects the wave frequency-attenuation curve. The maximum likelihood for the air voids size distribution is log-normal distribution. We compare the results obtained by the proposed method and the microscopical determination.
Abstract Voids in cement-based materials influence their material properties. While air voids within a certain range are beneficial for freezing-and-thawing resistance, large-size voids decreases strength and durability. This paper proposes a method to quantify the air voids size distribution, which use the concept of ultrasonic wave attenuation. The wave attenuation increases with the inclusion of air voids. Its measurement is compared with a theoretical model, and then three-dimensional information of air voids can be obtained. An application example of cement paste is presented and the results are discussed with the measurement of permeable pores and the result of a microscopical determination.
Air voids size distribution determined by ultrasonic attenuation
Yim, Hong Jae (Autor:in) / Kim, Jae Hong (Autor:in) / Lee, Bang Yeon (Autor:in) / Kwak, Hyo-Gyoung (Autor:in)
Construction and Building Materials ; 47 ; 502-510
04.05.2013
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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