Analysis and Feasibility of Asphalt Pavement Performance-Based Specifications for WisDOT

Literature review of most recent methods used for effective characterization of asphalt mixtures resulted in selecting a set of test methods for measuring mixture resistance for rutting and moisture damage at high temperature, fatigue cracking at intermediate temperatures, and thermal cracking at low temperatures. The methods were used to collect results for a large number of mixtures that vary in their composition including 3 sources of aggregates, 2 binders with and without polymer modification, different amounts of Recycled Asphalt Materials (RAM), and different volumetric properties. In addition, the sensitivity of specific mixture performance properties to variation of asphalt content and filler content was studied, and best methods to determine the effect of high RAM content on binder grades were evaluated. Based on the analysis of results collected, the Hamburg Wheel Tracking Test at 45°C is recommended for use to evaluate resistance of mixtures to rutting and moisture damage, and the Semi-Circular Bend (SCB) test at intermediate temperature of the PG grade, with one notch depth, is recommended for fatigue resistance. For thermal cracking it is recommended at this time to continue testing with the Disk Compact Tension (DCT) test as well as the low temperature SCB test following AASHTO TP105 until more data is available. The recommendation also included a specification framework for each of the distress, and tentative limits for the key performance indicators from each of the selected tests. The indicators selected include Creep rate, Stripping Inflection Point (SIP) and Strip rate for rutting and moisture damage; Flexibility Index for Fatigue Cracking, and Fracture Energy for Thermal Cracking. Frameworks include different limits for traffic level and climate conditions, as well as aging condition in case of thermal cracking. The results also demonstrate the importance of controlling aggregate properties and asphalt binder content during production as both significantly influenced lab measured resistance to cracking. Limited data showed that use of high RAM content field trials had similar PG grades and mechanical properties as conventional mixes. Results to study methods for estimating change in blended binder grade due to use of RAM demonstrated that evaluation of the mortar can be applied to further evaluate the effects of RAM type and content.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 131p

Subject/Index Terms

Filing Info

  • Accession Number: 01644555
  • Record Type: Publication
  • Report/Paper Numbers: 0092-15-04
  • Contract Numbers: WisDOT SPR# 0092-15-04
  • Files: TRIS, ATRI, USDOT, STATEDOT
  • Created Date: Jul 25 2017 10:51AM