LOW-TEMPERATURE BEHAVIOR OF HARD BITUMENS: EXPERIMENTS AND MODELING

To avoid rutting, the use of hard bitumens in wearing courses has been expanded. However, this may lead to surface cracking in asphalt mixes due to thermal stresses induced by low-temperature conditions. To improve the understanding of this phenomenon, five binders of different crude and manufacturing origin (10/30-pen grade) and the corresponding asphalt mixes have been studied. This analysis was part of a collaborative work done by Shell, the Laboratoire des Ponts et Chaussees (L.C.P.C.) and the Societe des Autoroutes Paris Rhin Rhone (S.A.P.R.R.) on the low-temperature behavior of hard bitumens. The binders were characterized by conventional and Superpave methods, and the asphalt mixes by relaxation and restrained cooling tests. The results obtained in the restrained cooling test were compared with those from numerical situations made with two calculation models, Thermostress from Shell and Proved-1d from L.C.P.C., both of which have been developed to predict the evolution of thermal stresses. These models are limited to a one-dimensional framework but could be extended to a whole road structure in order to take into account the low-temperature behavior of asphalt mixes in pavement design. The Thermostress and the proved-1d models are based on the same mathematical principles but use different approaches to fit the behavior of visco-elastic materials. The Thermostress model uses very simple experimental data on the binder and extrapolates mix behavior from the Van der Poel and Uge-Bonnaure nonograms. The proved-1d model requires a complex modulus measurements made ion the asphalt mix at different temperatures and frequencies. Both models have been validated by comparing simulations with data from the restrained cooling test conducted on the previously mentioned mixes. This study has show the importance of the rheological properties of the aged binders. Performance depends on the crude origin and the manufacturing route: some of the hard bitumens studied perform very well at low temperatures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Corporate Authors:

  Association of Asphalt Paving Technologists (AAPT)

  400 Selby Avenue, Suite I
  St Paul, MN  United States  55102
• Authors:
  • Maia, A F
  • MARCIANO, Y
  • ACHIMASTOS, L
  • Corte, J-F
  • Gourdon, J-L
  • Piau, J-M
  • Faure, M
• Conference:
  • Asphalt Paving Technology 1999
  • Location: Chicago, Illinois
  • Date: 1999-3-8 to 1999-3-10
• Publication Date: 1999

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 434-449
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 68
  • Publisher: Association of Asphalt Paving Technologists (AAPT)
  • ISSN: 0270-2932
  • Serial URL: https://www.asphalttechnology.org/site_page.cfm?pk_association_webpage_menu=9169&pk_association_webpage=19109

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Bitumen; Cooling; Cracking; Low temperature; Rutting; Simulation; Surface course (Pavements); Tests
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00784130
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Feb 25 2000 12:00AM