01478926

Component

Cracking in asphalt pavements causes primary failure in the pavement structure and leads to long-term durability issues that are often related to moisture damage. The fracture resistance and characteristics of asphalt materials significantly affect the service life of asphalt pavements. Numerous studies to understand asphalt fracture in pavements have typically considered only mode-I (opening) fracture, but many observations have demonstrated the significance of mode-II (sliding) fracture for a better design of pavement structures and for damage characterization of asphaltic materials. This study presents experimental and numerical efforts to characterize the mode-I and mode-II fracture properties of an asphalt mixture. To this end, semi-circular bending tests were integrated with a digital image correlation system and an extended finite element method. The integrated experimental-numerical approach attempted here shows that the mode-II fracture property is approximately three times greater than the mode-I fracture property, which clearly indicates that the mode-dependent fracture characteristics are necessary in the structural design of asphalt pavements with which multiaxial damage is usually associated.

This paper was sponsored by TRB committee AFK50 Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements.

01470560

13-2289

English

17p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; Photos; References; Tables

Asphalt mixtures; Bend tests; Fracture properties; Fracture tests; Mathematical methods; Pavement cracking; Pavement performance

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

Transportation Research Board Annual Meeting 2013 Paper #13-2289

TRIS, TRB, ATRI

Feb 5 2013 12:30PM