An extension of the aashto remaining-life methodology of overlaydesign that achieves consistent results is presented. The extended methodology permits an existing pavement after an overlay to deteriorate between two extremes: deterioration like a new pavement (traditional approach) and like an existing pavement without overlay (aashto approach). The methodology involves refining the aashto pavement condition curves and developing weighted condition curves for an existing pavement after an overlay. A deterioration parameter is incorporated that provides both design flexibility and consistency. Two types of design consistency are achieved: overlay-related and existing pavement-related. Sensitivity of the structural capacity of the overlay to failure serviceability, the minimum pavement condition factor, and variations of the valid range of deterioration parameter with effective structural capacity are examined. This paper appears in transportation research record no. 1272, Pavement management and rehabilitation 1990.
Abstract