Effect of Asphalt Concrete Cross-Anisotropy on Pavement Responses in Presence of Horizontal Tire-Pavement Contact Stress
In this study, effect of Asphalt Concrete (AC) cross-anisotropy on pavement stress-strain is evaluated in presence of horizontal tire-pavement contact stress in a dynamic Finite Element Model (FEM) framework. Geometry of this model is developed in ABAQUS based on the instrumented pavement section on Interstate-40 (I-40) near Albuquerque, New Mexico. Dynamic modulus tests were conducted on field-compacted AC cores to determine the viscoelastic parameters along both vertical and horizontal directions. Resilient modulus tests were conducted on unbound layer materials to determine stress-dependency parameters. Later, these parameters are incorporated to the model through User Defined Material (UMAT) interface. The FEM simulations are performed to determine stress-strain incorporating vertical and/or horizontal tire-pavement contact stresses. It is observed that incorporation of horizontal contact stress barely affects vertical strains in pavement layers. However, it leads to an increase in tensile strain at the bottom of the AC lifts/sub-layers. It is also observed that the tensile strain is the maximum in the top AC lift due to partial bond along interfaces of multiple AC lifts. It indicates that the top AC lift is the most critical layer in case of fatigue damage due to high amount of tensile strain. Shear strain near pavement surface highly increases due to the horizontal contact stress in presence of the AC cross-anisotropy. Finally, it is recommended to incorporate both vertical and horizontal non-uniform tire-pavement contact stress to pavement model with AC cross-anisotropy.
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Supplemental Notes:
- This paper was sponsored by TRB committee AFD80 Standing Committee on Pavement Structural Modeling and Evaluation.
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Corporate Authors:
500 Fifth Street, NW
Washington, DC United States 20001 -
Authors:
- Ahmed, Mesbah U
- Rahman, A S M A
- Tarefder, Rafiqul A
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Conference:
- Transportation Research Board 96th Annual Meeting
- Location: Washington DC, United States
- Date: 2017-1-8 to 2017-1-12
- Date: 2017
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: 17p
- Monograph Title: TRB 96th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Asphalt concrete; Asphalt concrete pavements; Finite element method; Modulus of resilience; Pavement layers; Rolling contact; Shear strain; Stresses; Tension; Viscoelasticity
- Identifier Terms: ABAQUS (Computer program)
- Uncontrolled Terms: Cross-anisotropy
- Geographic Terms: Albuquerque (New Mexico)
- Subject Areas: Highways; Pavements;
Filing Info
- Accession Number: 01625881
- Record Type: Publication
- Report/Paper Numbers: 17-05549
- Files: TRIS, TRB, ATRI
- Created Date: Feb 13 2017 5:19PM