Thin HMA Overlay

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Used to improve the functional surface characteristics of the concrete pavement including enhancing friction and reducing noise. Consists of open or gap-graded aggregates and rubberized or polymer-modified asphalt layer (0.4 to 0.8 in. thick) well bonded to the concrete surface. Also referred to as Thin Overlay, Thin HMA Overlay, Functional Overlay, Ultra Thin Bonded Wearing Course.