ACCELERATED TESTING OF RECYCLED ASPHALTIC CONCRETE

Uncertainty regarding the expected life cycle of recycled mixes has been the main factor preventing a more general adoption of recycling. This is particularly true when high proportions of reclaimed material are involved. In spite of the fact that recycled mixes can be produced to comply with all conventional specifications, there have been fears that the reprocessed binder may be inferior to new binder due to binder mixing efficiency, possible adverse effects resulting from the weathered nature of the reclaimed binder, and the long-term effects of recycling additives when these are used. These factors influence the life cycle of the recycled mix, by affecting the fatigue and permanent deformation characteristics, and the long-term durability. In 1982, the National Institute for Transport and Road Research (NITRR), Pretoria, South Africa, initiated an on-going research program to address the above and other unresolved issues in hot mix recycling, by way of (1) long-term monitoring of applications, (2) analysis of laboratory test results and mechanistic modelling, and (3) accelerated field testing. The behavior of pavement layers containing various proportions of reclaimed material is undergoing careful long-term monitoring throughout the country. To date their performance has not been found inferior to that of conventional layers. This paper contains a summary of the laboratory test results obtained to date. Attention is also focused on the use of the Heavy Vehicle Simulator to evaluate a recycled base layer as an integral part of a pavement structure.

• Corporate Authors:

  Association of Asphalt Paving Technologists (AAPT)

  400 Selby Avenue, Suite I
  St Paul, MN  United States  55102
• Authors:
  • Ferreira, M A
  • Servas, V P
  • Marais, C P
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1987

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 259-276
• Serial:
  • Volume: 56

Subject/Index Terms

• TRT Terms: Accelerated tests; Asphalt concrete; Base course (Pavements); Deformation; Driving simulators; Durability; Fatigue (Mechanics); Field tests; Heavy vehicles; Hot in-place recycling; Laboratory tests; Life cycle analysis; Mechanical analysis; Mechanistic design; Monitoring; Pavement performance; Performance evaluations; Recycled materials; Recycling
• Old TRIS Terms: Test results
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00739798
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Aug 28 1997 12:00AM