Evaluating the Sensitivity of Intermediate Temperature Performance Tests with Short-Term and Long-Term Laboratory Conditioning: Validation Study

Details

• Creators:
  Veginati, Varun ; Mensching, David ; Elwardany, Michael D. ; Andriescu, Adrian ; Haghshenas, Hamzeh ; Jahangiri, Behnam
• Corporate Creators:
  United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center
• Contributors:
  Fitzgerald, Cara
• Corporate Contributors:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
• Subject/TRT Terms:
  Aging (Materials) Asphalt Mixtures Reclaimed Asphalt Pavements Shingles Temperature Endurance Tests
• Publication/ Report Number:
  FHWA-HRT-24-147
• Resource Type:
  Tech Report
• Right Statement:
  Public Domain
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Contracting Officer:
  Fitzgerald, Cara; Mensching, David J.
• Corporate Publisher:
  United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development
• Abstract:
  Balanced mixture design (BMD) of asphalt mixtures comprises various elements that are likely to impact asphalt pavement performance. However, most BMD applications do not account for long-term aging. This gap limits the appropriateness of thresholds and BMD's potential to improve pavement performance because more additive and reclaimed materials available can behave in drastically different fashions during early, intermediate, and late stages of service. This report details the third phase of this study, in which phase I focused on the value of intermediate-temperature performance tests after short-term oven aging, which is included in current BMD frameworks, and phase Ⅱ focused on highlighting the sensitivity—or lack thereof—of common laboratory mixture performance tests to long-term aging. In this study, materials from four different States are subjected to long-term oven-aging (LTOA) conditions. The materials are plant-mixed, laboratory-compacted specimens from Florida, Montana, Ohio, and Vermont, with different nominal maximum aggregate sizes and reclaimed asphalt pavement (RAP) percentages. The indirect tensile cracking test, Illinois Flexibility Index Test (I-FIT), asphalt mixture performance tester cyclic fatigue test, and dynamic modulus test were used. Two LTOA methods for intermediate cracking tests were selected based on mixture location. The main objective of this report is to evaluate the impacts of LTOA on mixture performance. The results were analyzed to compare the differences between the cracking tests, which showed a reduction in mixture cracking indexes when LTOA is incorporated. The pattern of the indexes from this validation phase (phase Ⅲ) matched well with those from phase Ⅱ. The I-FIT showed more variability than the two other cracking test methods. The findings in this report illustrate that long-term aging is critical for a comprehensive BMD framework. Thus, more efforts are needed to revise some of the testing protocols, indexes, and thresholds before formulating BMD specifications with LTOA conditioning.
• Format:
  PDF
• Funding:
  DTFH61-17-D-00017
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:4d80e7785d6aa2754b8b7a26cd7ebff504188e09e678475af5a20991316b326ac876248fea06d6a1722f0808cfc178006aca0d37775b93c308bb2935c9c7b56e
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/86311/dot_86311_DS1.pdf
• File Type:
  [PDF - 2.31 MB ]