For thinner asphalt concrete sections, the horizontal tensilestrain at the bottom of the asphalt layers obtained using Jung'stechnique was found to be in reasonable agreement with Thompson'sAUPP. It also was in good agreement for thinner sections withbackcalculation of layer moduli and using these moduli in an elasticlayer program to obtain the horizontal strain. Jung's method appearsto overpredict strain in thick asphalt sections.

Seasonal ratios of strain calculated using Jung's method tothe strain at the initial testing period were calculated. Similarseasonal ratios were obtained for pavements of similar type andsubgrade stabilization type. The seasonal ratios could be usedto incorporate seasonal effects for the wet-no freeze zone ofNorth Carolina using three seasonal periods.

Fitting time series to the backcalculated moduli of the asphaltlayers and to the subgrade moduli as suggested by Ali and Parkerresulted in the most direct method to incorporate seasonal effectsand calculate remaining life.

Serious difficulties were demonstrated in correctly estimatingthe time to failure and order of failure of three similar designsections.