Dynamic Hydraulic Conductivity (Permeability) of Asphalt Pavements
M. Emin Kutay1, Ahmet H. Aydilek2 and Tom Harman3
1 Highway Research Engineer, Turner-Fairbank Highway Research Center-FHWA, 6300 Georgetown Pike Rm.
F210, McLean, VA 22101. E-mail: Muhammed.Kutay@fhwa.dot.gov
2 Assistant Professor, University of Maryland, 1163 Glenn Martin Hall, College Park, Maryland, 20742. E-mail:
3 M&C Team Leader, Turner-Fairbank Highway Research Center-FHWA, 6300 Georgetown Pike Rm. F210,
McLean, VA 22101. E-mail: Tom.Harman@fhwa.dot.gov
External pressures applied to a saturated pavement pore structure are often dynamic due to the repeated tire loading.
Therefore, a dynamic permeability constant is more realistic representation of the response of a pavement pore
structure than the Darcy's permeability. To investigate the unsteady (dynamic) fluid flow in asphalt pavements, a 3D
fluid flow model was developed using the lattice Boltzmann (LB) method. The model was validated using the well-
known closed form solution of oscillating flow through a circular tube. A number of simulations were carried out to
calculate the dynamic permeabilities of different asphalt specimens exposed to pulsatile pressures. It was shown that
the dynamic permeability of an asphalt pore structure collapse on a single curve for a given frequency, confirming
its universal behavior.
Hydraulic conductivity (permeability) of an asphalt pavement is one of the most important parameters that have a