United States Department of Transportation
i
The contribution of micro- and macro-texture to the skid resistance of flexible pavement.
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2016-02-01
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[PDF-1.62 MB]
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Alternative Title:Effect of aggregate micro- and macro-texture on pavement skid resistance.
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Edition:Final report
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Abstract:Skid resistance is an important characteristic of the pavement surface to reduce the number of road accidents. The
mechanisms involved in the activation of the frictional force required for a safe braking of the vehicle depend on both
the macro- and the micro-texture of the pavement surface. The state-of-the-practice methodologies commonly used for
measuring pavement texture at highway speeds only account for the macro-texture, which alone might not be sufficient
to effectively characterize skid resistance. This study explored different ways to characterize the micro-texture of
pavement surfaces with the main objective of quantifying the effect of accounting for both the micro and the macro
components of the texture, rather than just the macro-texture, on the prediction of skid resistance.
The friction and texture data analyzed in this study were collected from an experiment conducted on in-service flexible
pavement surfaces. Surface friction was measured using a British Pendulum Tester whereas texture data was collected
using a Circular Track Meter and a Laser Texture Scanner. The surface micro-texture was characterized by different
texture parameters calculated in both the spectral and the spatial domain. The impact of incorporating the micro-texture
on the prediction of skid resistance was evaluated by analyzing a series of models specified by each of the proposed
parameters. The results of the analyses show a significant improvement in predicting the surface friction when
accounting for both components of the surface texture, as opposed to only the macro-texture. Furthermore, the
parameters calculated on the frequency domain led to a better prediction power.
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