Ultrasonic Imaging Methods for Investigation of Post-tensioned Concrete Structures: A Study of Interfaces at Artificial Grouting Faults and Its Verification
作者： Martin Krause , Boris Milmann , Frank Mielentz , Doreen Streicher , Bernhard Redmer
DOI: 10.1007/S10921-008-0033-5
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摘要: This paper presents the progress of successful location grouting faults in tendon ducts with ultrasonic imaging. The examples were obtained research group FOR 384 funded by DFG (German Research Foundation). co-operation experimental and modeling allowed imaging identification grouted ungrouted areas (including strands) a large test specimen (40 m2). In addition to criteria for indicating post-tensioned known until now phase evaluation reflected pulses is described. Experiments wave propagation are presented reflections at metal plates concrete (thickness range 0.5 mm 40 mm) including strands. main part was achieved automated measurements using dry contact transducers, 3D-SAFT reconstruction considering typical elastic parameters exact site conditions. results shear waves as well pressure compared frequency from 50 kHz 120 kHz.
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