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This paper first illustrates briefly the possibility of fatigue failure of hydraulic, graded iron and steel slag base-course based on a follow-up on-site investigation on a trial asphalt pavement. Then, its fatigue failure criterion is derived based on repeated bending fatigue tests on the beam specimens prepared in the experimental yard. This failure criterion is implemented into the design flow of the Japanese mechanistic-empirical structural design method of asphalt pavement and an example analysis is presented. It is shown that the thickness of the base-course required for the designated design life can be reduced roughly by half with this modification of the current design flow.

FATIGUE FAILURE CRITERION FOR HYDRAULIC GRADED IRON AND STEEL SLAG BASE-COURSE AND ITS IMPLEMENTATION INTO THE JAPANESE ASPHALT PAVEMENT DESIGN METHOD