Optimal Selection of Flexible Pavement Components

by Salim S. Hejal, Grad. Instr.; Sch. of Civ. Engrg., Purdue Univ., West Lafayette, IN,
Thomas R. Buick, (A.M.ASCE), Transp. Planner; Valley Area Traffic and Transp. Study, Tempe, AZ,
Joseph C. Oppenlander, (M.ASCE), Prof. and Chmn.; Dept. of Civ. Engrg., Univ. of Vermont, Burlington, VT,

Serial Information: Transportation Engineering Journal of ASCE, 1971, Vol. 97, Issue 1, Pg. 1-14

Document Type: Journal Paper


The purpose of this systems analysis is to develop a rational method for the optimal selection of the thicknesses of the various pavement components. The design model consists of an objective function and nine constraint equations. The total cost of the pavement system is quantitatively described by this objective function. The various constraining equations quantify the boundary conditions to which the design of a flexible pavement is subject. These physical limitations complete the realism of the mathematical model in describing the real-world situation of flexible pavement design. The design model was solved by a modified linear programming technique. In developing practical solutions to the design model, 31,680 optimal flexible pavements were designed for highway construction conditions indicative of Indiana. The thickness requirements for the various layers are specified for each combination of structural number, minimum total thickness, and unit costs of pavement materials. Cost savings which range from 2% to 15% result in the thickness selection of flexible pavement components by this design procedure.

Subject Headings: Pavement design | Thickness | Mathematical models | Asphalt pavements | System analysis | Pavement condition | Infrastructure construction | Construction materials | Indiana | United States

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