A mixed-integer programming model is described that is based on the AASHTO design procedure for flexible pavements and formulated for selecting pavement materials and determining surface, base, and subbase course thicknesses. The objective of the model is to minimise the total cost of pavement structures while meeting the constraints of AASHTO flexible pavement design equations and user-defined criteria. The Flexible Pavement Optimal Design computer program that interfaces with the optimisation package LINDO has been developed to obtain quick solutions. Two solutions are given by the program: nonintegers and integers. The program can be used for flexible pavement thickness design in cases in which one or more materials are available for each of three layers if the layer characteristics and material properties are known. (A)
Abstract