Cross-Anisotropy of Laboratory and Field Compacted Asphalt Concrete Samples

This study determines the cross-anisotropy of laboratory and field compacted asphalt concrete samples. In the laboratory, two sizes of cube samples, 50 mm and 75 mm in sizes, were prepared using kneading and gyratory compactors and by cutting field collected core samples. One set of cube samples were subjected to compression loading to failure through the top face and the other set through the side face of the sample. In addition, two sets of beam samples were tested for flexural stiffness using load on both the top and the side faces. Results show that the side faces can sustain average compressive stresses of 0.89, 0.91 and 0.77 times of the compresses stresses of the top faces for kneading, gyratory and field compacted cube samples respectively. The average flexural stiffness of the side face is 0.85 times of that of the top face. For validation, Finite Element Model (FEM) was constructed and stress-strain data from a field instrumented pavement section on Interstate 40 (I-40) in New Mexico was used. FEM and field responses show the cross-anisotropy value is 0.8, which is close to the laboratory samples’ cross-anisotropy values. Overall, the cross-anisotropy is greater in the field samples than in the laboratory samples.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK50 Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Islam, Rashadul Md
  • Ahmed, Mesbah U
  • Tarefder, Rafiqul A
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 15p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Asphalt concrete; Compression; Field studies; Finite element method; Laboratory tests; Samples; Stiffness
• Uncontrolled Terms: Cross-anisotropy
• Geographic Terms: New Mexico
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01514963
• Record Type: Publication
• Report/Paper Numbers: 14-2916
• Files: TRIS, TRB, ATRI
• Created Date: Feb 21 2014 3:16PM