Estimation of Hot-Mix Asphalt Concrete Rutting Potential from Repeated Creep Binder Tests

Typically, rutting is one of the major causes of premature failure of hot mix asphalt concrete within the state of Texas. To identify rutting potential of hot mix asphalt concrete, the Hamburg Wheel Tracking Device (HWTD) test has been specified by the Texas Department of Transportation. If HWTD test results identify a mix to be rut susceptible, the test results do not indicate whether the non bituminous components of mix (like air voids, aggregate types, etc.) or asphalt binder is the reason for rutting potential. Recently proposed repeated creep asphalt binder test can be used to identify the rut susceptible asphalt binder. Therefore, the objective of this study was to identify whether rut prone asphalt binder can be identified using repeated creep test and the measured accumulated strain (from repeated creep tests) can be related to rut depth measured from HWTD. To perform this study two mix designs used within the state of Texas, Type-D and Coarse Matrix High Binder were selected. Both of the chosen mixes have shown success in the field and have recently been placed using modifiers. The modifiers assessed in this study include, Styrene-Butadiene-Styrene, Styrene-Butadiene-Rubber, Tire Rubber, and Elvaloy. Since the mix types are rut resistant and mix design are the same, the major factor contributing towards rutting of HMAC can be traced to the asphalt binders which is the only component that is altered between the mixes. The test results suggested that the rut susceptible asphalt binders can be identified using repeated creep tests; thus, the rutting potential of HMAC consisting of rut susceptible asphalt binders.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; References; Tables;
  • Pagination: 23p
  • Monograph Title: TRB 86th Annual Meeting Compendium of Papers CD-ROM

Subject/Index Terms

Filing Info

  • Accession Number: 01044207
  • Record Type: Publication
  • Report/Paper Numbers: 07-2886
  • Files: TRIS, TRB
  • Created Date: Feb 8 2007 7:35PM