Impact of HWD dynamic loading on measured deflection basins and back-calculated stiffnesses of flexible airport pavements

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Sun, J
Oh, E
Ma, Z
Bell, P
Ong, DEL
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2025
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Abstract

Accurate measurement of pavement structural response is critical when evaluating the condition and load-bearing capacity of a flexible airport pavement. Pavement surface deflection basins tested by Heavy Weight Deflectometer (HWD) have been widely applied as a non-destructive testing method to analyse the elastic modulus of pavement layers via a back-calculation procedure. A clear linear relationship between measured deflections and HWD drop loads was established, with R2>0.99. The studied flexible pavement structure showed linear elastic responses under different drop loads, with relatively stable elastic moduli of pavement layers. With the increasing drop load (DL), the back-calculated hot-mix asphalt (HMA) surface modulus was slightly influenced. The results also identified the existing buried sensors may affect the measured HWD responses. By analysing statistical results, this study provides a benchmark for airport owners to evaluate the structural conditions for their flexible pavements when applying HWD in their maintenance and rehabilitation (M&R) works.

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Measurement

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243

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This accepted manuscript is distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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Information and computing sciences

Mathematical sciences

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Sun, J; Oh, E; Ma, Z; Bell, P; Ong, DEL, Impact of HWD dynamic loading on measured deflection basins and back-calculated stiffnesses of flexible airport pavements, Measurement, 2025, 243, pp. 116390

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