Influence of asphalt mixture stiffness on fatigue failure
2004 (English)In: Journal of materials in civil engineering, ISSN 0899-1561, Vol. 16, no 6, 516-525 p.Article in journal (Refereed) Published
This paper examines the question of an appropriate failure criterion for asphalt fatigue characterization. The results presented are based on cyclic fatigue tests and obtained from three mixtures containing different penetration grade bitumens from one and the same source. The mixtures are tested at 0, 10, and 20degreesC using uniaxial testing (tension/compression) on cylindrical samples. It is found that failure can be demonstrated by studying the evolution of the strain field using three parallel extensometers (separated by 120degrees around the specimen). The failure arises from coalescence of microcracks (damage localization). The decrease in stiffness at failure is related to mixture stiffness, where stiff materials (low temperature and/or mixtures containing low pen grade binder) show comparatively small decrease. A statistical approach based on fatigue tests carried out at different temperatures is suggested, an approach which uses stiffness degradation as a measure of critical fatigue stiffness. The advantage of such a failure criterion compared to the classical failure criterion (decrease in stiffness by 50%) for different temperatures is discussed. Using the proposed criterion, higher consistency in results is achieved compared to results obtained using the classical failure criterion.
Place, publisher, year, edition, pages
2004. Vol. 16, no 6, 516-525 p.
Asphalt, Microcracks, Mixtures, Stiffness
IdentifiersURN: urn:nbn:se:kth:diva-40351DOI: 10.1061/(ASCE)0899-1561(2004)16:6(516)ISI: 000225114800002ScopusID: 2-s2.0-10644290197OAI: oai:DiVA.org:kth-40351DiVA: diva2:441198
QC 201109152011-09-152011-09-142011-09-15Bibliographically approved