HMA shear resistance, permanent deformation, and rutting tests for Texas mixes : final year-2 report.

Details

• Creators:
  Walubita, Lubinda F. ; Faruk, Abu NM ; Lee, Sang I. ; Nguyen, Dung ; Hassan, Raenita ; Scullion, Tom
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration ; Texas. Dept. of Transportation
• Subject/TRT Terms:
  Deformation Hot Mix Paving Mixtures Recommendations Rutting Shear Strength Shear Tests Test Procedures
• Publication/ Report Number:
  FHWA/TX-15/0-6744-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas A&M Transportation Institute
• Abstract:
  Traditionally run at one test temperature (122°F), the Hamburg wheel tracking test (HWTT) has a proven
  
  history of identifying hot mix asphalt (HMA) mixes that are moisture susceptible and/or prone to rutting. However,
  
  with the record summer temperatures of the recent years, several shear and rutting failures have occurred with HMA
  
  mixes that had passed the HWTT in the laboratory. For the most part, failures occurred in high shear locations,
  
  particularly with slow-moving traffic at controlled intersections (accelerating/decelerating), stop-go sections, elevated
  
  temperatures, heavy/high traffic loading, and where lower PG asphalt-binder grades have been used.
  
  This two-year study was undertaken to improve the performance of the existing laboratory rutting-shear tests
  
  including the HWTT in simulating the field rutting conditions of the HMA and exploring new supplementary and/or
  
  surrogate HMA rutting/shear tests. In particular, a potential surrogate test should be able to discriminate HMA mixture
  
  performance for application in high shear stress areas (i.e., intersections) as well as discern temperature thresholds at
  
  which a given HMA mix, with a given PG asphalt-binder grade, becomes unstable and more prone to rutting and/or
  
  shear failure.
  
  In line with these objectives, this final project report documents the research work completed in this study.
  
  Several of the existing HMA rutting-shear tests were comprehensively evaluated with special focus on the HWTT.
  
  Researchers propose several enhancements to the HWTT protocol that are expected to improve its overall performance
  
  in predicting HMA rutting susceptibility. Additionally, a new supplementary HMA shear test, namely the simple
  
  punching shear test (SPST) was developed that showed good potential to be considered as a surrogate to the HWTT.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:f29ddb9c668b5e3e949d33a920c89b206c0b58fc7cf9c31847477588f280043e
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28565/dot_28565_DS1.pdf
• File Type:
  [PDF - 13.92 MB ]