What is it about?
The falling weight deflectometer (FWD) is a non-destructive testing device that has been used by many road agencies worldwide since 1980 for structural evaluation of flexible pavements. In early 2000, the world first Doppler laser-based traffic speed deflectometer (TSD) was developed by Greenwood Engineering, and now eight TSD vehicles are in use worldwide. The two main advantages of the TSD technology are: (a) the ability to carry out continuous bearing capacity measurements instead of discrete points, (b) that testing can be carried out at traffic speeds without the need for lane closures with a stationary device such as FWD.
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Why is it important?
The study successfully established a correlation between maximum deflections TSD-D0 and FWD-D0 that are derived from the two devices. This study also drew some interesting conclusions in that deflection data collected by TSD could be transformed to FWD equivalent structural numbers with simple models as derived in the study. The outcome of this study was an established methodology for reporting structural performance at network level utilizing TSD deflection data.
Perspectives
The study is undertaken by a PhD student who also works at a Government Road & Transport department and is supervised by me as an academic at Griffith University.
Dr Sanaul Huq Chowdhury
Griffith University
Read the Original
This page is a summary of: A Study of the Structural Performance of Flexible Pavements Using Traffic Speed Deflectometer, Journal of Testing and Evaluation, December 2017, ASTM International,
DOI: 10.1520/jte20160189.
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