Wavelet Denoising of TSD Deflection Slope Measurements for Improved Pavement Structural Evaluation

Nondestructive testing devices are widely used to assess the structural condition and bearing capacity of pavement systems. Continuous deflection devices (CDDs) can safely measure pavement deflection (or other related properties) while traveling at highway speed, which reduces traffic disruption. However, CDD measurements are contaminated with relatively high noise levels compared to stop-and-go devices such as the Falling Weight Deflectometer (FWD). The objective of this article is to evaluate the structural condition of pavement sections using Traffic Speed Deflectometer (TSD) deflection slope measurements. The authors use wavelet transform denoising to: (1) identify localized weak spots such as those that are caused by pavement reflection cracking; and (2) denoise deflection slope measurements to calculate the effective structural number of the pavement. Results show that failure to denoise deflection slope measurements can lead to calculated values that are highly variable (unstable). Attempting to filter these highly variable measurements can lead to erroneous results.


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  • Accession Number: 01529755
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 10 2014 4:56PM