01556294

Component

https://doi.org/10.3141/2447-03

Cracking in asphalt concrete pavements causes primary failure in the pavement structure. This cracking is considered one of the key issues to be addressed when paving materials are selected and sustainable pavement structures are designed. Given the diverse nature of traffic loads and pavement geometry, the asphalt mixture in the pavement is subjected to complex cracking behavior, such as mixed-mode fracture (i.e., the combination of an opening mode and a shearing mode of fracture). To date, most studies considered Mode 1 (opening) fractures only, because of technical challenges in testing and analysis. For a better understanding of asphalt fracture and more accurate design of pavement structure, mode-dependent fracture behavior needs to be characterized. This paper presents experimental efforts to characterize the mode-dependent fracture behavior of an asphalt mixture. Toward this end, semicircular bending (SCB) fracture tests were incorporated into the results of digital image correlation analysis for a fine aggregate matrix mixture subjected to a 10 mm/min loading rate and an intermediate temperature condition of 21°C. To achieve different fracture modes (i.e., opening, sliding, and mixed), the geometric loading configurations of the SCB test were varied through the use of different initial notch inclination angles and different supporting spans. Test results were further analyzed to calculate fracture resistance. Observations from this study, though limited, imply that mixed-mode fracture characteristics exist and need to be considered in the structural design of asphalt pavements with which multiaxial cracking usually is associated.

01553809

14-2515

English

pp 23–31

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295475

Print

Figures (6) ; References (28) ; Tables (1)

Asphalt mixtures; Asphalt pavements; Bend tests; Fracture mechanics; Fracture properties; Pavement cracking

Highways; Materials; Pavements; I30: Materials

TRIS, TRB, ATRI

Jan 27 2014 2:52PM

• American and European Mix Design Approaches Combined: Use of NCHRP Performance Indicators to Analyze Comité Européen de Normalisation Test Results
• Analytical Approach to Estimate the Rheological Properties of Asphalt Binders
• Balanced Asphalt Mixture Design Through Specification Modification: Louisiana’s Experience
• Calibration and Validation of a Comprehensive Constitutive Model for Asphalt Mixtures
• Characterization of Microdamage Healing in Asphalt Concrete with a Smeared Continuum Damage Approach
• Comparison of Fatigue Damage, Healing, and Endurance Limit with Beam and Uniaxial Fatigue Tests
• Development and Evaluation of Laboratory Conditioning Procedures to Simulate Mixture Property Changes Effectively in the Field
• Development of a Failure Criterion for Asphalt Mixtures Under Different Modes of Fatigue Loading
• Effect of Laboratory Mixing and Compaction Temperatures on Asphalt Mixture Volumetrics and Dynamic Modulus
• Effect of Long-Term Ambient Storage of Compacted Asphalt Mixtures on Laboratory-Measured Dynamic Modulus and Flow Number
• Evolution of Thermoviscoelastic Properties of Asphalt Mixtures with Oxidative Aging
• Laboratory Hot-Mix Asphalt Performance Testing: Asphalt Mixture Performance Tester Versus Universal Testing Machine
• Multiscale Model for Asphalt Mixtures Subjected to Cracking and Viscoelastic Deformation
• Numerical–Experimental Approach to Characterize Fracture Properties of Asphalt Mixtures at Low Temperatures