ISSN: 1945-7553
Published Online: 19 June 2009
Page Count: 7

Contribution of the Bituminous Mortar and Stone Skeleton to the Resistance to Permanent Deformation in Asphalt Mixtures

Muraya, P. M.
Norwegian Univ. of Science and Technology, Høgskoleringen 7A, Trondheim,

Molenaar, A. A. A.
Faculty of Civil Engineering, Delft Univ. of Technology, Stevinweg 1, Delft

van de Ven, M. F. C.
Faculty of Civil Engineering, Delft Univ. of Technology, Stevinweg 1, Delft,

(Received 18 December 2008; accepted 30 April 2009)

Abstract

This paper describes the results of a research that was conducted to investigate the contribution of the different components in an asphalt mixture to the resistance to permanent deformation. As part of this research, extensive triaxial tests were performed on the stone skeletons of dense, stone mastic, and porous asphalt concrete. An extensive characterization of the bituminous mortar was also performed using the dynamic shear rheometer and the direct tension tests. The results showed that aggregate skeletons exhibit a high tendency to dilate implying tensile stresses and strains in the bituminous mortar. The results also showed that plastic deformation is much more important than viscous deformation for the stone skeleton mixtures and that viscous deformation is more important for the dense mixture. The findings of the research were used to analyze the permanent deformation that occurred in accelerated pavement test sections.

Keywords:
rutting, mortar, skeleton, triaxial test, tension test, compression test

Paper ID: JTE000315
DOI: 10.1520/JTE000315
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