Research on Fatigue of Asphalt Mixtures and Pavements in Nebraska

Hydrated lime has been recognized by the asphalt research community as a material capable to enhance various asphalt mixture properties and performance. In an attempt to mitigate moisture related damage, the Nebraska Department of Roads (NDOR) requires the use of 1.0% additional hydrated lime in the design of hot-mix asphalt (HMA) mixtures to be used in the roadways of the state. The 1.0% lime addition to premoistened aggregate may not be the best scenario to maximize pavement performance when pavement distresses such as fatigue cracking, rutting, and moisture damage are considered all together. Thus, it is necessary to investigate an appropriate amount of hydrated lime that would result in the most resistant mixture to various kinds of distresses when hydrated lime is specifically mixed with local asphalt paving materials in Nebraska. The current research project evaluated the stiffness (in the form of the dynamic modulus) and performance (permanent deformation and fatigue damage in both controlled-force and controlled-displacement modes) of mixtures with identical job mix formula and different only on the amount of additional hydrated lime (0.5%, 1.0%, 1.5%, 2.0% and 3.0%). Required testing facilities and devices were installed (or developed at the University of Nebraska (UNL) Geomaterials Laboratory) to allow this project to be conducted. Two testing modes were used: Indirect Tensile (IDT) and Uniaxial Tensile tests. The test results generally showed that the increasing trend of resistance to fatigue damage in controlled-force mode as more hydrated lime was added to the mixtures, which was not observed from the controlled-displacement fatigue tests. The number of cycles to failure reached its maximum value for the 1.5% additional hydrated lime case when the specimens were subjected to the controlled-displacement fatigue testing mode. Extra lime resulted in worse performance. The resistance of the mixtures to the permanent deformations was generally enhanced as more hydrated lime was added, but it seemed to have stabilized after the use of 2.0% hydrated lime. The findings from this project can be strengthened with more data and additional work. Suggested follow-up studies conclude this report.

• Record URL:
  https://digitalcommons.unl.edu/ndor/41
• Record URL:
  https://dot.nebraska.gov/media/t3fddgcj/final-report-p579.pdf
• 
• Corporate Authors:

  University of Nebraska, Lincoln

  Department of Civil Engineering, Nebraska Hall
  Lincoln, NE  United States  68588-0531

  Nebraska Department of Roads

  1500 Highway 2, P.O. Box 94759
  Lincoln, NE  United States  68509
• Authors:
  • Aragao, Francisco Thiago Sacramento
  • Kim, Yong-Rak
  • Lee, Junghun
• Publication Date: 2008-2

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; References; Tables;
• Pagination: 59p

Subject/Index Terms

• TRT Terms: Asphalt pavements; Calcium hydroxide; Fatigue cracking; Hot mix asphalt; Pavement performance; Rutting
• Geographic Terms: Nebraska
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01471993
• Record Type: Publication
• Report/Paper Numbers: P579
• Contract Numbers: 26-1107-0092-001
• Files: TRIS, ATRI, STATEDOT
• Created Date: Feb 11 2013 9:13AM