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Smart Structures and Systems Volume 17, Number 1, January 2016 , pages 1-15 DOI: https://doi.org/10.12989/sss.2016.17.1.001 |
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Non-contact surface wave testing of pavements: comparing a rolling microphone array with accelerometer measurements |
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Henrik Bjurström, Nils Ryden and Björn Birgisson
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| Abstract | ||
| Rayleigh wave velocity along a straight survey line on a concrete plate is measured in order to compare different non-destructive data acquisition techniques. Results from a rolling non-contact data acquisition system using air-coupled microphones are compared to conventional stationary accelerometer results. The results show a good match between the two acquisition techniques. Rolling measurements were found to provide a fast and reliable alternative to stationary system for stiffness determination. However, the non-contact approach is shown to be sensitive to unevenness of the measured surface. Measures to overcome this disadvantage are discussed and demonstrated using both forward and reverse rolling measurements. | ||
| Key Words | ||
| non-destructive testing; seismic testing; Lamb waves; surface waves; material characterization | ||
| Address | ||
| Henrik Bjurstrom, Nils Ryden and Bjorn Birgisson: Department of Highway and Railway Engineering, KTH Royal Institute of Technology, Brinellvägen 23, 100 44 Stockholm, Sweden | ||