Table 16-1.—Recommended Uses of Various Asphalt GradesFigure 16-3.-Spread of wheel load through the pavementstructure.asphalt, and one or more supporting courses, which maybe of the following types:1. Asphalt base, consisting of asphalt-aggregatemixtures (macadam)2. Crushed stone (rock), slag, or gravel3. Portland cement concrete4. Old brick or stone block pavementsAsphalt pavement structure consists of all coursesabove the prepared foundation. The upper or top layeris the asphalt-wearing surface.Essential Properties of Asphalt-WearingSurfaceThe surface of an asphalt pavement, exposed tovehicular traffic, must be tough to resist distortion andto provide a smooth riding surface. It must bewaterproof and sloped to shed surface water to theroadside and protect the entire asphalt pavementstructure and the foundation from the erosive effects ofmoisture. It must resist wear, caused by traffic, and stillretain necessary anti-skid properties. It must also bebonded to the layer or course beneath it.16-3
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