Wavelet-based characterisation of aggregate segregation in asphalt concrete X-ray computed tomography images
Aggregate segregation, defined as the non-uniform distribution of fine and coarse aggregates within asphalt concretes (ACs), is recognised as a serious pavement construction problem that reduces pavement life. This paper describes a mathematical approach for quantifying the degree of
directional aggregate segregation in ACs. It utilises a wavelet approach for separating coarse from fine aggregates and the normalised wavelet energy to quantify aggregate concentration (i.e. white grey scale intensity). A directional segregation index (SI) is defined as the ratio of fine-to-coarse
aggregate normalised wavelet energy. This index is shown to be a good indicator of the degree of segregation observed in X-ray CT images of AC samples. The approach demonstrated using laboratory compacted samples can be applied to quantify segregation in 2D images of composite materials.
Keywords: aggregate segregation; asphalt concrete; discrete wavelet transform; imaging; wavelet energy
Document Type: Research Article
Affiliations: 1: ESC INC., FHWA, Office of Pavement Technology, 1200 New Jersey Av. SEWashingtonDC20590-0001, USA 2: Department of Civil and Environmental Engineering,University of Texas-San Antonio, San AntonioTX78249-0668, USA
Publication date: 01 December 2011
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