Determination of Mixture Fracture Performance with the Help of Fracture Mechanics
2010 (English)Conference paper (Refereed)
Cracking is one of the most influential distresses that mostly affect the service life of asphalt concrete pavements. These cracks start as microcracks that later coalesce to form macrocracks, which propagate due to tensile and/or shear stress. As the cracks propagate, the pavement serviceability starts to reduce dramatically. In order to improve the cracking performance of asphalt pavements, it is important to acquire a good understanding of the cracking mechanism and to have a reliable system to determine mixture’s resistance to crack development and propagation.
An HMA (Hot Mix Asphalt) fracture mechanics framework based on Superpave IDT (InDirect Tension test) has been developed in the US. The main ideology of this framework is the concept of the existence of a damage threshold. The dissipated creep strain energy (DCSE) limit and the fracture energy (FE) limit of asphalt mixtures are the lower and upper thresholds, respectively. According to this fracture mechanics framework, three types of testing are performed in the IDT testing device for predicting the fracture resistance of bituminous mixtures. Testing comprises resilient modulus, static creep and tensile strength. In this study, theory of this framework and application to field will be explained extensively.
Place, publisher, year, edition, pages
2010. 1-8 p.
Cracking; Fracture mechanics; Superpave IDT
IdentifiersURN: urn:nbn:se:kth:diva-49785ISBN: 978-975-6983-65-2OAI: oai:DiVA.org:kth-49785DiVA: diva2:460288
9th International Congress on Advances in Civil Engineering
QC 201201102012-01-102011-11-292012-01-10Bibliographically approved