Figure 16-1.—Petroleum asphalt flow chart.Figure 16-2.-Liquid asphaltic products.16-2overloading either the strength of the subgradeinternal strength of the pavement itself.Figure 16-3 shows the wheel load (W)transmitted to the pavement surface through theor thebeingtire atan approximately uniform vertical pressure (P405). Thepavement then spreads the wheel load to the foundation,so the maximum pressure on the foundation is onlyP415. By proper selection of pavement materials andwith adequate pavement thickness, P415 will be smallenough to be easily supported by the subgrade.ASPHALT PAVEMENT STRUCTUREAsphalt pavement is a general term applied to anypavement that has a surface, constructed with asphalt(fig. 16-4). Normally, it consists of a surface course(layer) of mineral aggregate, coated and cemented with
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