00985879

Component

https://doi.org/10.3141/1896-13

http://scholar.google.com...oque&publication_year=2004

Cracking in hot-mix asphalt (HMA) pavements is a major mode of premature failure. Recent work at the University of Florida has led to the development of a new viscoelastic fracture mechanics-based crack-growth law called the HMA fracture mechanics law, which is capable of fully describing both initiation and propagation of cracks in asphalt mixtures. The successful simulations of crack growth for generalized pavement conditions depend largely on how well the state of stress can be predicted in and around existing cracks in pavements. Previous work has focused on the adaptation of a displacement-discontinuity boundary-element method for predicting stresses in the Superpave indirect tensile test (IDT), which then were subsequently used to predict the crack initiation and crack growth in simulated IDT tests that used HMA fracture mechanics. The previous displacement-discontinuity boundary-element formulation is here extended into layered materials. Homogeneous layers are stitched together numerically in "welded" contact. The ability of the new numerical formulation to model the effects of temperature-induced stiffness gradients on tensile stresses at the top of two cracked pavement sections in Florida is demonstrated. These pavement sections were modeled with and without temperature-induced stiffness gradients. The introduction of stiffness gradients into the HMA layer is shown to increase the magnitude of tensile stresses at the top of the pavement, which is consistent with previous observations.

This paper appears in Transportation Research Record No. 1896, Pavement Design and Accelerated Testing 2004.

00985866

English

p. 129-137

2004

Transportation Research Record

0309094895

Figures (11) ; References (12) ; Tables (3)

Asphalt pavements; Boundary element method; Fracture mechanics; Hot mix asphalt; Pavement cracking; Pavement layers; Stiffness; Stresses; Temperature; Viscoelasticity

Top-down cracking

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Feb 10 2005 12:00AM

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• CALIBRATION OF MECHANISTIC-EMPIRICAL PERFORMANCE MODEL FOR CONTINUOUSLY REINFORCED CONCRETE PAVEMENT PUNCH-OUTS
• COMPUTER-BASED MULTIMEDIA PAVEMENT TRAINING TOOL FOR SELF-DIRECTED LEARNING
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• DEVELOPMENT OF A MECHANISTIC-EMPIRICAL STRUCTURAL DESIGN PROCEDURE FOR CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS
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• FATIGUE CRACKING MECHANISMS IN ASPHALT PAVEMENTS WITH VISCOELASTIC CONTINUUM DAMAGE FINITE-ELEMENT PROGRAM
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• INTERLAYER AND DESIGN CONSIDERATIONS TO RETARD REFLECTIVE CRACKING
• LABORATORY, PROTOTYPE, AND IN-SERVICE ACCELERATED PAVEMENT TESTING TO MODEL PERMANENT DEFORMATION
• MECHANISTIC-EMPIRICAL MODEL TO PREDICT TRANSVERSE JOINT FAULTING
• ONE-WAY AND TWO-WAY DIRECTIONAL HEAVY-VEHICLE SIMULATOR LOADING: EFFECTS ON RUTTING IN HOT-MIX ASPHALT PAVEMENTS
• PAVEMENT RESPONSES DUE TO HARD LANDINGS OF HEAVY AIRCRAFT
• PERFORMANCE OF COLD IN-PLACE RECYCLING IN NEVADA
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• USING LONG-TERM PAVEMENT PERFORMANCE DATA TO PREDICT SEASONAL VARIATION IN ASPHALT CONCRETE MODULUS