Advertisement

Determining the Healing Potential of Asphalt Concrete Mixtures–A Pragmatic Approach

  • S. Erkens
  • D. van Vliet
  • A. van Dommelen
  • G. A. Leegwater
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 4)

Abstract

Most design methods for pavements use a factor explaining the difference between pavement life predictions from design models and performance in the road [1]. Part of this correction factor is healing, the natural capacity of asphalt concrete to recover in rest periods, which generally are not present in laboratory fatigue tests in order to limit the test time. In the design method used for Dutch highways [2] a shift factor of 4 is traditionally used. This factor is based on in-practice behaviour of pavements with mixes using straight run bitumen of limited softness (mostly 40/60 and 70/100 pen bitumen). Currently many developments regarding polymer and chemical modification and the use of hard binders raise questions about the value of the shift factor for these mixtures as well as questions about how much of this factor is actually related to the healing potential of the mixes.

In the project described in this paper it is investigated whether the four point bending test used to assess the fatigue resistance in the European standard can be used in a discontinuous way to determine the healing capacity of a mix. In order to do this, a set of continuous and discontinuous tests was performed on two mixes that deviate only in the softness of their binder, 70/100 or 10/20. Although the approach appears promising in its simplicity and the consistency of the results, finding the correct interpretation remains difficult and may require linking the pragmatic with more fundamental understanding of the mechanism behind healing.

Keywords

Fatigue Life Asphalt Concrete Healing Factor Load Repetition Loading Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Rijkswaterstaat, Ontwerp Specificaties Asfaltverhardingen, Rijkswaterstaat, Nederland (2011) (in Dutch)Google Scholar
  2. 2.
    COST333, European Communities, Transport Research, Cost 333: Develoment of New Bituminous Pavement Design Method, ISBN 92-828-6796-XGoogle Scholar
  3. 3.
    Westera, G.E.: Onderzoek naar het Healingsproces van asfalt beton., TWAO-F rapport (1989) (in Dutch)Google Scholar
  4. 4.
    Westera, G.E., Bouman, S.R.: Studie over healing ten behoeve van het project ASFLT/TWAO; nadere beschouwing van het fenomeen healing bij asfalt KOAC-WMD, rapport 94.0002 (1994) (in Dutch)Google Scholar
  5. 5.
    Pronk, A.C., Cocurullo, A.: Investigation of the PH model as a prediction tool in Fatigue bending tests with Rest Periods. In: Al-Qadi, Scarpas (eds.) Advanced Testing and Characterisation of Bituminous Materials, Loizos, Partl, Taylor & Francis Group, London (2009) ISBN 978-0-415-55854-9Google Scholar
  6. 6.
    Shen, S., Carpenter, S.H.: Dissipated Energy Concepts for HMA Performance: Fatigue and Healing. Dept. of Civil and Environmental Engineering, Univ. of Illinois at Urbana-Champaign, Advanced Transportation Research and Engineering Laboratory, ATREL (2007)Google Scholar
  7. 7.
    Breysse, D., de la Roche, C., Domee, V., Chauvin, J.J.: Influence of Rest tim on Recovery and Damage during Fatigue Tests on Bituminous Composites. In: Proceedings 6th RILEM Symposium PTEBM 2003, Zurich (2003)Google Scholar
  8. 8.
    Bazin, P., Saunnier, J.B.: deformability, Fatigue and Healing Properties of Apshalt Mixes. In: Second Int. Conf. On the Structural Design of Asphalt Pavements, Ann Arbor, Michigan, pp. 553–569.Google Scholar
  9. 9.
    Dommelen, A.E., van Erkens, S.M.J.G., van Vliet, D., Leegwater, G.: Healing van asfalt mengsels, onderzoek naar een pragmatische proefmethode. InfraQuest report IQ-W-2011-1 (2011) (in Dutch, concept)Google Scholar
  10. 10.
    Daniel, J.S.: Rate Dependent Stiffnesses of Asphalt Concrete used for Field to Laboratory prediction and Fatiue and Healing Evaluation, MSc-thesis. North Carolina State University, Raleigh, NC (1996)Google Scholar
  11. 11.
    Little, D.N., Lytton, R.L., et al.: An Analysis of the mechanism of Micro damage healing based on the of micro mechanics first principles of fracture and healing. AAPT 68, 501–542 (1999)Google Scholar
  12. 12.
    Kringos, N., Pauli, T., Scarpas, A., Robertson, R.: A Thermodynamical Approach to Healing in Bitumen. In: 7th RILEM Conference on Advanced Testing and Characterization of Bituminous Materials, Rhodes, Greece (May 2009)Google Scholar

Copyright information

© RILEM 2012 2012

Authors and Affiliations

  • S. Erkens
    • 1
  • D. van Vliet
    • 2
  • A. van Dommelen
    • 1
  • G. A. Leegwater
    • 2
  1. 1.Rijkswaterstaat, Dutch Ministery of Infrastructure and EnvironmentDutchThe Netherlands
  2. 2.TNO Built EnvironmentDelftThe Netherlands

Personalised recommendations