EVALUATION OF FATIGUE PROPERTIES OF RECYCLED ASPHALTIC CONCRETE. SIXTH INTERNATIONAL CONFERENCE, STRUCTURAL DESIGN OF ASPHALT PAVEMENTS, VOLUME I, PROCEEDINGS, UNIVERSITY OF MICHIGAN, JULY 13-17, 1987, ANN ARBOR, MICHIGAN

Recycling of aged asphalt concrete pavements has been demonstrated to be cost-effective and to reduce the demand for natural resources such as aggregate and asphalt. Because of the advantages derived when using recycled materials, the capability to predict long-term performance is needed so that optimum benefits can be obtained. This study was undertaken to evaluate the flexural fatigue performance of recycled asphalt concrete mixtures and to compare these results to those measured for conventional asphalt concrete mixtures. To make these comparisons, samples of aged asphalt concrete were obtained from three locations where recycling was planned. These samples were blended with new aggregate and new asphalt materials to produce six different recycled mixtures. Two aggregate types, a crushed gravel and a crushed limestone, were used to produce two conventional mixtures and to blend with the reclaimed asphalt pavement to produce the six recycled mixtures. Three asphalt materials, which were obtained to produce the various mixtures being evaluated, consisted of AC-20 for preparing the conventional mixtures and AC-5 and a recycling agent for preparing the recycled mixtures. The flexural fatigue properties were evaluated for all mixtures. Tests were conducted on the asphalt binder (combined binder for recycled mixtures) prior to mixing with aggregate. Tests on the binder included penetration at 40 deg F and 77 deg F; ductility at 40 deg F and 77 deg F; softening point; viscosity at 275 deg F, 225 deg F, and 140 deg F; specific gravity; and rolling thin-film oven test. Tests conducted on the asphalt concrete included all tests conducted during mix design and flexural fatigue test at 40 deg F and 77 deg F. Test results indicate that recycled mixtures can be designed to perform as well as conventional mixtures when tested in flexural fatigue. The properties of the blended asphalt binder in the recycled mixture should be similar to the properties of a new asphalt binder to provide satisfactory results.

• Corporate Authors:

  University of Michigan, Ann Arbor

  Department of Civil Engineering
  Ann Arbor, MI  United States  48109
• Authors:
  • Brown, E R
• Publication Date: 1987

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 305-322
• Serial:
  • Publication of: Michigan University, Ann Arbor
  • Publisher: University of Michigan, Ann Arbor

Subject/Index Terms

• TRT Terms: Asphalt concrete; Asphalt pavements; Binders; Conferences; Crushed limestone; Fatigue (Mechanics); Flexural strength; Gravel; Pavement performance; Pavements; Recycling; Testing
• Uncontrolled Terms: Crushed gravel; Flexural fatigue
• Old TRIS Terms: Recycled pavements; Test results
• Subject Areas: Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00485494
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 31 1989 12:00AM