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Dynamic Effects on Moisture Transport in Asphalt Concrete M. Emin Kutay1

Summary: Dynamic Effects on Moisture Transport in Asphalt Concrete
M. Emin Kutay1
and Ahmet H. Aydilek2
Abstract: Permeability of an asphalt pavement is one of the most important parameters that have a direct influence on its design life. It
is an intrinsic property that relates the average fluid velocity to a constant pressure gradient; however, the external pressures on a saturated
pavement pore structure are often dynamic due to the repeated tire loading in the field. A dynamic permeability constant, therefore, is a
more realistic representation of the response of a pavement pore structure to external stresses. In order to investigate the unsteady
dynamic fluid flow in asphalt pavements, a three-dimensional fluid flow model was developed using the lattice Boltzmann method. The
model was validated using the well-known closed form solution of oscillating flow through a circular tube. Simulations were carried out
to calculate the permeabilities of different asphalt specimens exposed to pulsatile pressures as well as the pore pressures and shear stresses
at the solid­water interfaces. The results indicated that the dynamic permeability of an asphalt pore structure collapses on a single curve
for a given frequency, confirming a universal behavior. Dynamic effects were generally limited to near the surface of the specimens
analyzed, and the pore pressures and velocities varied nonlinearly along the depth due to the heterogeneous nature of the asphalt
specimens. The results are encouraging yet should be considered preliminary as they are based on stone matrix asphalt specimens and one
type of pulsatile load analyzed.
DOI: 10.1061/ ASCE 0733-947X 2007 133:7 406
CE Database subject headings: Moisture; Asphalt concrete; Dynamics; Hydraulic conductivity; Tomography; Pore pressure; Shear
Moisture damage caused by the destruction of cohesive bond


Source: Aydilek, Ahmet - Department of Civil and Environmental Engineering, University of Maryland at College Park


Collections: Engineering