Fatigue and healing characteristics of bitumens studied using dynamic shear rheometer

Title: Fatigue and healing characteristics of bitumens studied using dynamic shear rheometer
Author(s): X. Lu, H. Soenen, P. Redelius
Paper category : conference
Book title: Sixth International RILEM Symposium on Performance Testing and Evaluation of Bituminous Materials
Editor(s): M. N. Partl
Print-ISBN: 2-912143-35-7
e-ISBN: 2912143772
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 408 - 415
Total Pages: 8
Nb references: 11
Language: English

Abstract: This paper characterizes the fatigue and healing behavior of bitumen using a dynamic shear rheometer (DSR). Different types of bitumen, before and after aging, were investigated in strain- and stress-controlled modes. Procedures of storage recuperation and intermittent loading were used to determine the effect of healing on bitumen fatigue. The results indicated that, at sufficiently high stiffness, bitumen exhibited fatigue, observed by a progressive decrease in complex modulus (G*) with load applications. The fatigue life was dependent on load amplitude, and in a log-log plot, straight lines were obtained. After oxidative aging, the slope of fatigue line may increase. Regarding the effect of rest periods (healing) on fatigue, it was found that bitumens differed widely both in strain-controlled and stress-controlled tests. In the strain-controlled fatigue and storage recuperation tests, recovery of the stiffness was not reflected in an extension of the fatigue life. In the stress-controlled tests using intermittent loading, the minimum ratio of rest time versus loading time for a significant benefit to fatigue life was found to vary from half to 10 between the bitumens studied.

Online publication: 2003-03-02
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143772.051