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Title:

Toward Realistic Heterogeneous Fracture Modeling of Asphalt Mixture Using Disk-Shaped Compact Tension Test Based on Discontinuum Approach

Accession Number:

01031308

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The fracture of asphalt pavements and overlays continues be a major consideration in pavement design and pavement performance, particularly in an era where stiffer mixtures and thicker pavement structures are being used in order to address increasing truck traffic. Recent efforts to develop performance-based pavement design systems have been limited by links between material component properties and mixture properties and the ability to accurately predict pavement distress without relying on highly empirical models. One major shortcoming is the current lack of understanding of fracture mechanisms, including the nucleation, initiation, and propagation of cracks in asphalt pavements. This paper presents the application of a bilinear cohesive softening model in conjunction with discrete element method to simulate crack initiation and propagation in asphalt concrete using a disk-shaped compact tension (DC(T)) test. The digital specimen image obtained from high-resolution image scanning can be projected into the discrete element mesh to capture geometrical features of the materials microstructure in the range of sand-sized particles to coarse aggregates This paper demonstrates that using a discrete element approach, fracture tests can be accurately modeled even with simple descriptions of constitutive material behavior. The crack trajectory and global fracture behavior of present numerical results matches well with those of experimental results. Some of the important benefits of a discontinuum approach, such as the effects of material microstructure on microcracking, crack path, and measured and predicted fracture energy are presented.

Monograph Accession #:

01020180

Report/Paper Numbers:

06-2975

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Buttlar, William Glen
Kim, Hyunwook
Wagoner, Michael Parker

Pagination:

23p

Publication Date:

2006

Conference:

Transportation Research Board 85th Annual Meeting

Location: Washington DC, United States
Date: 2006-1-22 to 2006-1-26
Sponsors: Transportation Research Board

Media Type:

CD-ROM

Features:

Figures (9) ; References (39) ; Tables (1)

Subject Areas:

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Source Data:

Transportation Research Board Annual Meeting 2006 Paper #06-2975

Files:

TRIS, TRB

Created Date:

Mar 3 2006 11:10AM