A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental study of wave dispersion and attenuation in concrete
In the present paper results from an experimental study of ultrasonic through-transmission measurements on cementitious materials are described. Narrow band pulses of different frequencies up to about 1 MHz are introduced into paste, mortar and concrete specimens allowing for direct measurement of pulse wave velocity and attenuation for each frequency while phase velocity was also calculated according to the technique introduced by Sachse and Pao. Experimental investigations have shown that although specimen geometry influences velocity measurements, it is not the reason for the observed dispersion which is therefore attributed to the material itself. The results highlight the w/c influence being mostly evident on paste and mortar while the aggregate content is a decisive parameter in the propagation behavior of mortar and concrete. Following the comparison between mortar and concrete, the aggregate size seems to have a more definite impact on the attenuative behavior than on the pulse velocity while the observed slight dispersion at low frequencies seems to be originating from the inhomogeneous nature of mortar and especially concrete. Nevertheless, any difference in propagation parameters due to different design parameters of concrete, i.e. w/c, a/c and aggregate fineness, should be sought at frequencies above 100 kHz.
Experimental study of wave dispersion and attenuation in concrete
In the present paper results from an experimental study of ultrasonic through-transmission measurements on cementitious materials are described. Narrow band pulses of different frequencies up to about 1 MHz are introduced into paste, mortar and concrete specimens allowing for direct measurement of pulse wave velocity and attenuation for each frequency while phase velocity was also calculated according to the technique introduced by Sachse and Pao. Experimental investigations have shown that although specimen geometry influences velocity measurements, it is not the reason for the observed dispersion which is therefore attributed to the material itself. The results highlight the w/c influence being mostly evident on paste and mortar while the aggregate content is a decisive parameter in the propagation behavior of mortar and concrete. Following the comparison between mortar and concrete, the aggregate size seems to have a more definite impact on the attenuative behavior than on the pulse velocity while the observed slight dispersion at low frequencies seems to be originating from the inhomogeneous nature of mortar and especially concrete. Nevertheless, any difference in propagation parameters due to different design parameters of concrete, i.e. w/c, a/c and aggregate fineness, should be sought at frequencies above 100 kHz.
Experimental study of wave dispersion and attenuation in concrete
Experimentelle Untersuchung der Wellendispersion und -schwächung in Beton
Philippidis, T.P. (author) / Aggelis, D.G. (author)
Ultrasonics ; 43 ; 584-595
2005
12 Seiten, 19 Bilder, 2 Tabellen, 22 Quellen
Article (Journal)
English
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