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Asphalt Pavement Structure
Function of Base Course and Subgrade

Equipment Operator Basic - Beginning construction equipment operators manual
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Table  16-1.—Recommended  Uses  of  Various  Asphalt  Grades Figure 16-3.-Spread of wheel load through the pavement structure. asphalt, and one or more supporting courses, which may be  of  the  following  types: 1. Asphalt base, consisting of asphalt-aggregate mixtures   (macadam) 2. Crushed stone (rock), slag, or gravel 3.  Portland  cement  concrete 4.  Old  brick  or  stone  block  pavements Asphalt pavement structure consists of all courses above the prepared foundation. The upper or top layer is  the  asphalt-wearing  surface. Essential Properties of Asphalt-Wearing Surface The surface of an asphalt pavement, exposed to vehicular traffic, must be tough to resist distortion and to   provide   a   smooth   riding   surface.   It   must   be waterproof and sloped to shed surface water to the roadside  and  protect  the  entire  asphalt  pavement structure  and  the  foundation  from  the  erosive  effects  of moisture. It must resist wear, caused by traffic, and still retain  necessary  anti-skid  properties.  It  must  also  be bonded to the layer or course beneath it. 16-3







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