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|Material Type:||Thesis/dissertation, Manuscript|
|Document Type:||Book, Archival Material|
|All Authors / Contributors:||
Mohammad Ali Ashayer Soltani; Hervé Di Benedetto; Institut national des sciences appliquées (Lyon).
|Description:||1 vol. (289 p.) : ill. ; 30 cm.|
|Responsibility:||par Mohammad Ali Ashayer Soltani ; sous la direction de Hervé Di Benedetto.|
This work on the fatigue behaviour of the bitumen mixes was achieved at the Département Génie Civil et Bâtiment of the Ecole Nationale des Travaux Publics de l'Etat (E.N.T.P.E), and lies within the scope of a collaboration with the companies ELF ANTAR FRANCE and CECA. After a bibliographical part we present the perfecting of a homogeneous test which we adapted for the study of the fatigue of the bituminous mix. The test is carried out at temperature controlled on cylindrical samples in alternate traction compression. The test can be carried out in deformation or stress control. We propose a procedure for the calculation of the rate of damage per cycle of loading. This calculation takes account of the non-linearity of the damage with the number of cycles and corrects the influence of the parasitic phenomena which appear during the fatigue tests on the bituminous mix. From the experimental results obtained we could check (for the first time to our knowledge) that the fatigue behaviour of the bitumen binders is independent of the mode of loading (strain or stress). Two different densities, three temperatures and four types of binder were used to check and validate the procedure of the calculation of the rate of damage suggested. The results obtained show a very weak dispersion, incomparable with that of the standard tests of fatigue on the bituminous mix. The method suggested presents good performances to classify various formulations with respect to their fatigue resistance. The duration of a test is limited to eight hours and the number of tests necessary to characterize a formulation of bituminous mix does not exceed ten. A discussion on certain aspects related to the fatigue of the bituminous mix (heating, cooling, thixotropy, reduction in the rate of damage with the number of cycles, non- homogeneity of the test, etc.) is also proposed. Our analysis and our results blame the non-homogeneous tests and the traditional criterion of fatigue life (division by two of the initial module) to characterize the fatigue of the bituminous mix. Consequently, we think that the standards in use concerning the fatigue of the bituminous mix require to be re-examined.