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A platform for research: civil engineering, architecture and urbanism
Effects of the viscoelastic nature of concretes on ultrasonic nondestructive evaluation
Several nondestructive stress wave methods exist for applications to concrete testing. The ultrasonic pulse velocity test (UPV) and the spectral analysis of surface waves (SASW) are two of such methods which are popularly applied. SASW has been applied to both asphaltic and portland cement concretes, whereas UPV is generally restricted to portland cement concrete structures. The formulations of these methods rely on the assumption of a linearly elastic test material. However, the viscoelastic nature of concretes is well known. Thus, it is of interest to determine the contribution of this viscoelasticity to the results of the stress wave tests. This will be achieved through viscoelastic wave propagation theory. Results: The observed viscoelastic nature of concretes will affect all concrete wave propagation measurements. However, the effect on the frequency dependence of longitudinal wave velocity is most likely negligible for portland cement concrete. This corroborates well with existing practice wherein UPV tests are assumed to be frequency independent. Frequency dependent attenuation measurements may be an effective approach to characterize both portland cement and asphaltic concretes.
Effects of the viscoelastic nature of concretes on ultrasonic nondestructive evaluation
Several nondestructive stress wave methods exist for applications to concrete testing. The ultrasonic pulse velocity test (UPV) and the spectral analysis of surface waves (SASW) are two of such methods which are popularly applied. SASW has been applied to both asphaltic and portland cement concretes, whereas UPV is generally restricted to portland cement concrete structures. The formulations of these methods rely on the assumption of a linearly elastic test material. However, the viscoelastic nature of concretes is well known. Thus, it is of interest to determine the contribution of this viscoelasticity to the results of the stress wave tests. This will be achieved through viscoelastic wave propagation theory. Results: The observed viscoelastic nature of concretes will affect all concrete wave propagation measurements. However, the effect on the frequency dependence of longitudinal wave velocity is most likely negligible for portland cement concrete. This corroborates well with existing practice wherein UPV tests are assumed to be frequency independent. Frequency dependent attenuation measurements may be an effective approach to characterize both portland cement and asphaltic concretes.
Effects of the viscoelastic nature of concretes on ultrasonic nondestructive evaluation
Einfluß der viskoelastischen Eigenschaft des Betons auf seine Untersuchung mit Ultraschall
Rose, J.L. (author) / Popovics, J.S. (author) / Pilarski, A. (author)
1994
8 Seiten, 7 Bilder, 6 Quellen
Conference paper
English
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