Material Selection and Design Consideration for Moisture Damage of Asphalt Pavement

Moisture damage is a primary mode of distress occurring in Nebraska hot mix asphalt (HMA) pavements. The use of hydrated lime has been recommended for Nebraska HMA pavements to mitigate moisture-related damage. There are several techniques of introducing hydrated lime into HMA mixtures, but the effects of hydrated lime in terms of its physical/chemical and/or mechanical mechanisms on moisture damage resistance to HMA pavements have not been fully understood. Somewhat arbitrarily one percent of lime addition by total weight of dry aggregates in a mix has been applied. Research is needed to better understand moisture damage mechanisms and to evaluate the effects of additives including hydrated lime as moisture damage resisting agents. To this end, various performance testing such as asphalt pavement analyzer (APA) testing under water, Hamburg testing under water, and American Association of State Highway and Transportation Officials (AASHTO) T-283 tensile strength ratio evaluation with different freeze-thaw cycles, and some fundamental property measurements of mix components based on dynamic shear rheometer (DSR) testing, micromechanical fracture-damage testing, and surface energy testing of asphalt mastics and aggregates were conducted. Testing data and analyses demonstrated that hydrated lime contributed to moisture damage resistance due to synergistic effects of mastic stiffening and advanced bonding characteristics at mastic-aggregate interfaces. However, a well-controlled lime treatment to maximize distribution and dispersion of lime particles onto aggregate surfaces would be required. In addition to the clear effects of hydrated lime, mineral filler in the HMA mix demonstrated its damage-resisting effects in an early stage of moisture damage due to substantial stiffening effects from filler addition. Fundamental characteristics of mix components measured in this study were closely related to macroscopic performance behavior of asphalt concrete samples, which infers that the testing-analysis protocol based on the mix components can be a basis for potential specification-type technique for evaluating (and/or predicting) moisture damage of HMA mixtures and pavements.

  • Record URL:
  • Corporate Authors:

    University of Nebraska, Omaha

    Department of Civil Engineering, 6001 Dodge Street
    Omaha, NE  United States  68182-0178

    Nebraska Department of Roads

    1500 Highway 2, P.O. Box 94759
    Lincoln, NE  United States  68509
  • Authors:
    • Kim, Yong-Rak
    • Lutif, Jamila Emi Sudo
  • Publication Date: 2006-12-14

Language

  • English

Media Info

  • Media Type: Print
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 68p

Subject/Index Terms

Filing Info

  • Accession Number: 01045512
  • Record Type: Publication
  • Report/Paper Numbers: P564
  • Contract Numbers: 26-1118-0065-001
  • Files: TRIS, STATEDOT
  • Created Date: Mar 24 2007 8:47AM