Study on Permeability Coefficient of Asphalt Mixture

Abstract

Premature damage may arise from excessive permeability of asphalt mixture. There was no requirement for permeability during asphalt mixture design in the early specification. The theory of permeability of mixture is discussed, and Darcy’s law is found applicable to asphalt mixture and the falling head test is suitable for dense asphalt mixture. The relation between permeability and air voids of AC and SMA is presented in this paper through research in laboratory. A modified permeameter is introduced. Characteristics of permeability coefficient of asphalt mixture are also analyzed. A standard of coefficient of permeability suggested to be adopted during asphalt mixture design is submitted.