Fatigue damage of crumb rubber modified mixtures

Title: Fatigue damage of crumb rubber modified mixtures
Author(s): I. Artamendi, H. Khalid
Paper category : conference
Book title: Fifth International RILEM Conference on Reflective Cracking in Pavements
Editor(s): C. Petit, I.L. Al-Qadi and A. Millien
Print-ISBN: 2-912143-47-0
e-ISBN: 2912143764
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 493 - 500
Total Pages: 8
Nb references: 4
Language: English

Abstract: This study analyses the fatigue results obtained from four-point bending beam tests for three close graded wearing courses, a conventional and two crumb rubber modified mixtures. Crumb Rubber Modifier (CRM) from truck- and car-tyre rubber was added at 10% to a conventional asphalt binder by the wet process. Fatigue tests were carried out under controlled strain and stress conditions at 10oC and 10Hz, in which fatigue life was evaluated in terms of the number of cycles to 50% stiffness reduction. A damage parameter based on the linear reduction in stiffness during the test, was introduced and a relationship was found between the rate of damage and the initial strain for both test modes. Refinements to a damage model were introduced to counteract the variability due to dissipated energy effects in the two test modes. Results showed the beneficial effect of crumb rubber addition on the fatigue lives. The longest fatigue life was obtained for the mix modified with truck-tyre rubber. The rate of damage for the conventional mix was higher than for the rubber-modified mixtures, and the lowest damage rate corresponded to the mixture modified with CRM from truck-tyre rubber.

Online publication: 2004-04-15
Publication type : full_text
Public price (Euros): 0.00