Non-contact surface wave testing of pavements: comparing a rolling microphone array with accelerometer measurements

  • Bjurstrom, Henrik (Department of Highway and Railway Engineering, KTH Royal Institute of Technology) ;
  • Ryden, Nils (Department of Highway and Railway Engineering, KTH Royal Institute of Technology) ;
  • Birgisson, Bjorn (Department of Highway and Railway Engineering, KTH Royal Institute of Technology)
  • Received : 2014.02.09
  • Accepted : 2014.09.06
  • Published : 2016.01.25


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.



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