The two variables that most influence the behavior of asphaltic concrete pavements are subgrade modulus and thickness of the asphaltic concrete. Other significant variables are: temperature of the asphaltic concrete, asphaltic concrete modulus, frequency of the dynamic loading, asphalt content by weight in mix, and voids in the asphaltic concrete mix.
During a series of Road Rater tests on a experimental pavement in Kentucky, deflection test data varied widely from expected values. Test data reported by Kallas and Riley permitted the development of an equation relating asphaltic concrete modulus to its temperature and to the frequency of loading. However, after deflection data were adjusted for temperature and frequency, the variation was still greater than expected. Construction records for each test station were examined; the void content and asphalt cement content of the mix were found to vary considerably.
Digital Object Identifier
Southgate, Herbert F., "Effects of Construction Variations Upon Dynamic Moduli of Asphaltic Concrete" (1982). Kentucky Transportation Center Research Report. 765.