EIGHT-YEAR PERFORMANCE EVALUATION OF AN ASPHALT-RUBBER HOT MIX PAVEMENT

In October 1980, the Connecticut Department of Transportation (ConnDOT) placed an experimental 900-ft section of asphalt-rubber hot mix bituminous pavement on state route 79 in Madison, Connecticut. Finely ground rubber was supplied by the Arizona Refining Company and was blended with the asphalt (grade AC-20) in the ratio of 1/5 (20% rubber). The pavement was placed as a 1.5-in. thick overlay in one lift using conventional paving techniques. A standard ConnDOT class 2 bituminous pavement was placed at the same time and used as a control section. Engineers from ConnDOT's Division of Research monitored the surface condition, skid resistance and roughness during the period from October 1980 to August 1986, and again in June/July 1989. In September 1986, it was concluded and published in a six-year evaluation report that the asphalt-rubber pavement was performing better than the standard ConnDOT class 2 control mix. The conclusion was drawn primarily on the basis of the difference in the amount of longitudinal cracking that had developed during the six-year observation period. An eight-year evaluation made this past summer indicates that current conditions parallel those reported in 1986. On the basis of transverse, longitudinal and alligator cracking, the asphalt-rubber mix continues to perform better than the control section. Both the skid resistance and roughness values remain at acceptable levels and are similar for the control and experimental pavements.

• Supplemental Notes:
  • This paper was prepared for presentation at the National Seminar on Asphalt-Rubber, Kansas City, Missouri, October 30-31, 1989.
• Corporate Authors:

  Connecticut Department of Transportation

  Bureau of Highways, 24 Wolcott Hill Road, P.O. Drawer A
  Wethersfield, CT  United States  06109
• Authors:
  • Larsen, D A
• Publication Date: 1989

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 21 p.

Subject/Index Terms

• TRT Terms: Alligator cracking; Asphalt rubber; Bituminous overlays; Condition surveys; Hot mix asphalt; Longitudinal cracking; Performance evaluations; Roughness; Skid resistance; Transverse cracking
• Old TRIS Terms: Alligatoring
• Subject Areas: Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00603125
• Record Type: Publication
• Report/Paper Numbers: Rept No. 116-3-89-8
• Files: TRIS, STATEDOT
• Created Date: Jan 31 1991 12:00AM