Trend Curve Optimal Control Model for Optimizing Pavement Maintenance Strategies Consisting of Various Treatments

Most literature on pavement maintenance optimization for the case of continuous time assumes only one type of maintenance treatment, such as overlay, to be applicable and demonstrates solution procedures with simple cases of limited scopes. However, as overlays may not always be appropriate, depending on traffic loading/pavement situations, the objective of this article is to propose an optimization approach based on the trend curve optimal control model, to obtain optimal strategies possibly consisting of overlay, resealing, and reconstruction. The applicability of the solution procedure is demonstrated with several cases representing a variety of traffic loading/pavement situations. The solutions indicate that an optimal maintenance strategy can consist of multiple types of treatments depending on the situation, illustrating the versatility of the proposed procedure.