Anisotropic Properties of Asphalt Concrete: Characterization and Implications for Pavement Design and Analysis
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 5
Abstract
Asphalt concrete has been recognized as an anisotropic material, but the degree of anisotropy and its implications for pavement design and analysis have not been well understood. This paper illustrates the difference between the stress fields of an isotropic and an anisotropic pavement under wheel load through analytical solution and finite-element simulation for several cases. A servocontrolled true triaxial (cubical) testing device was used to test cubical asphalt concrete specimens under general stress states to characterize the anisotropic properties of asphalt concrete. It was discovered that (1) the stiffness of a cored field specimen has significant differences in the vertical and horizontal direction; and (2) the significant difference may result in larger shear stress and tensile stress in a pavement. These findings indicate that characterization and modeling of the anisotropic properties of asphalt concrete are an important area that deserves further investigation.
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References
Adu-Osei, A., Little, D. N., and Lytton, R. L. (2001). “Cross-anisotropic characterization of unbound granular materials.” Transportation Research Record. 1757, Transportation Research Board, Washington, D.C., 82–91.
Airey, D. W., and Wood, D. M. (1988). “The Cambridge true triaxial apparatus.” Advanced triaxial testing of soil and rock, STP 977, ASTM, Philadelphia, 796–805.
Arthur, J. R. F. (1988). “Cubical devices: Versatility and constraints.” Advanced triaxial testing of soil and rock, STP 977, ASTM, Philadelphia, 743–765.
Atkinson, R. H. (1972). “A cubical test cell for multiaxial testing of materials.” PhD dissertation, Univ. of Colorado at Boulder, Boulder, Colo.
Boulbibane, M., Weichert, D., and Raad, L. (1999). “Numerical application of shakedown theory to pavements with anisotropic layer properties.” Transportation Research Record. 1687, Transportation Research Board, Washington, D.C., 75–81.
Green, G. E. (1971). “Strength and deformation of sand measured in an independent stress control cell.” Stress-strain behavior of soils, Proc., Roscoe Memorial Symp., G. T. Foulis and Co. Ltd., Cambridge, U.K., 285–323.
Hambley, E. C. (1969). “A new triaxial apparatus.” Geotechnique, 19(2), 307–309.
Ko, H. Y., and Scott, R. F. (1967). “A new soil testing apparatus.” Geotechnique, 17(1), 40–57.
Kuwano, R., Connolly, T. M., and Jardine, R. J. (2000). “Anisotropic stiffness measurements in a stress-path triaxial cell.” Geotech. Test. J., 23(2), 141–157.
Lade, P. V., and Duncan, J. M. (1973). “Cubical triaxial tests on cohesionless soil.” J. Soil Mech. Found. Div., 99(10), 793–812.
Li, X. S., and Dafalias, Y. F. (2002). “Constitutive modeling of inherently anisotropic sand behavior.” J. Geotech. Geoenviron. Eng., 128(10), 868–880.
Masad, E., Tashman, L., Somedavan, N., and Little, D. (2002). “Micromechanics-based analysis of stiffness anisotropy in asphalt mixtures.” J. Mater. Civ. Eng., 14(5), 374–383.
NeSmith, W. M. (1997). “Development of a computer controlled multiaxial cubical testing apparatus.” MS thesis, Georgia Institute of Technology, Atlanta.
Pennington, D. S., Nash, D. F. T., and Lings, M. L. (2001). “Horizontally mounted bender elements for measuring anisotropic shear moduli in triaxial clay specimens.” Geotech. Test. J., 24(2), 133–144.
Roy, D., Campanella, R. G., Byrne, P. M., and Hughes, J. (2002). “Undrained anisotropic monotonic behavior of sand from in situ tests.” J. Geotech. Geoenviron. Eng., 128(1), 85–91.
Seyhan, U., and Tutumluer, E. (2002). “Anisotropic modular ratios as unbound aggregate performance indicators.” J. Mater. Civ. Eng., 14(5), 409–416.
Sture, S. (1979). “Development of multiaxial cubical test device with pore-water pressure monitoring facilities.” Rep. No. VPI-E-79.18, Dept. of Civil Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, Va.
Sture, S., and Desai, C. S. (1979). “A fluid cushion truly triaxial or multiaxial testing device.” Geotech. Test. J., 2(1), 20–33.
Tutumluer, E., Adu-Osei, A., Little, D. N., and Lytton, R. L. (2001). “Field validation of the cross-anisotropic behavior of unbound aggregate bases.” ICAR-502-2.
Wolf, K. (1935). “Ausbreitung der Kraft in der Halbebene und im Halbraum bei anisotropem Material.” Z. Angew. Math. Mech., B. 15, H.5.
Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 5 • October 2005
Pages: 535 - 543
Copyright
© 2005 ASCE.
History
Received: Mar 16, 2004
Accepted: Aug 30, 2004
Published online: Oct 1, 2005
Published in print: Oct 2005
Notes
Note. Associate Editor: Eyad Masad
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