G85: Eco-friendly alternative to EME2 for long-life & cost-effective base courses by optimizing aggregates & using modified bitumens

Aggregate packing concepts developed in the field of high-performance cement concretes, initially by Caquot (1937) and then by contemporary researchers since the 1970's, were transposed to the field of asphalt concretes. These concepts, associated with the use of the gyratory compactor on aggregates only, enabled the development of a new laboratory design procedure of dense high-modulus asphalt concretes. These mixes are characterized by great coarse aggregate interlock and no need for low penetration grade bitumens to obtain the EME2 specifications requirements, in particular the 14,000MPa stiffness modulus value at 15°C. Besides, the use of only 3.9% of SBS modified bitumen combined with such an optimized aggregate packing leads to the design of the so-called GB5® material, showing excellent compactability, very high stiffness modulus and above all high fatigue resistance in a single formulation, allowing for reduced pavement thickness and greater longevity. Laboratory assessment of such materials consisted in the evaluation of compactability, moisture resistance, rutting resistance at 60°C, complex stiffness modulus at 15°C and fatigue resistance at 10°C. Apart from these results, the paper also addresses the successful application of this new material on different job sites, located mainly in France. The paper illustrates that the proposed innovative material may be potentially considered from now on as a relevant solution for sustainable long life pavements that do not deteriorate structurally, needing only timely surface maintenance.

• Availability:
  • Find a library where document is available. Order URL: http://www.piarc.org/en/order-library/13949-en-Proceedings%20of%20the%20XXIVth%20World%20Road%20Congress,%20Mexico%20-%202011.htm
• Supplemental Notes:
  • Abstract reprinted with permission of the World Road Association – PIARC.
• Corporate Authors:

  World Road Association (PIARC)

  La Grande Arche, Paroi Nord, Niveau 5
  F-92055 La Defense Cedex,   France 
• Authors:
  • Olard, F
• Conference:
  • 24th World Road Congress
  • Location: Mexico City , Mexico
  • Date: 2011-9-26 to 2011-9-30
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 16p
• Monograph Title: 24th World Road Congress Proceedings: Roads for a Better Life: Mobility, Sustainability and Development

Subject/Index Terms

• TRT Terms: Aggregate gradation; Asphalt concrete pavements; Asphalt mixtures; Bitumen; Compactibility; Durability; Penetration resistance; Rutting; Stiffness
• Geographic Terms: France
• Subject Areas: Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 01515908
• Record Type: Publication
• ISBN: 2840602679
• Files: TRIS
• Created Date: Feb 25 2014 10:05AM