Effect of Sublayer Support on the Attainment of Density in an Asphalt Concrete Overlay. State of the Art

摘要

A considerable number of asphalt concrete overlays do not attain specified density requirements during construction. Although density is a function of many variables such as mix characteristic, climate, contractor equipment and operation, and acceptance test methods, a significant variable may be the ability of the existing pavement section to provide adequate support for the densification of the overlay. A literature review was performed as well as a survey of 25 selected states in order to determine the magnitude of the problem and to assimilate all available data on the subject. A conclusion is the density of properly designed and constructed asphalt concrete overlays is only marginally affected by the sublayer support. A suggested plan for future research is presented to further quantify the effect of sublayer support.