A method of designing asphaltic concrete overlays has been developed making use of (1) Kentucky's proposed design curves, (2) an estimate of future traffic and the associated fatigue (five procedures are presented according to types of information available), (3) strength of subgrade on subject project (laboratory CBR tests or results of dynamic in-place tests such as the Road Rater), and (4) present condition of the existing pavement (from dynamic in-place tests, roughness measurements, or present serviceability index). Deterioration was expressed as reduced thicknesses of new-quality materials producing the same measured dynamic deflections. The total thickness for the predicted traffic minus the effective or reduced thickness of the existing pavement is the overlay thickness required.
Digital Object Identifier
Southgate, Herbert F.; Sharpe, Gary W.; and Deen, Robert C., "A Rational Thickness Design System for Asphaltic Concrete Overlays" (1978). Kentucky Transportation Center Research Report. 818.