Validation of hot-poured crack sealant performance-based guidelines.

Details

• Creators:
  Al-Qadi, Imad L. ; Ozer, Hasan ; Yousefi, Seyed Saleh ; Sawalha, Mohammad ; McGhee, Kevin K.
• Corporate Creators:
  Virginia Transportation Research Council (VTRC)
• Corporate Contributors:
  Virginia. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Aging (Materials) CSAT CSBBR CSDTT DSR Field Performance Field Tests Guidelines Hot-poured Crack Sealant Mechanical Properties Performance Tests Rheological Properties Rheology RV Sealant Grade Sealing Compounds Crack Sealants

  More +
• Publication/ Report Number:
  VTRC 17-R26
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report
• Corporate Publisher:
  Virginia Transportation Research Council (VTRC)
• Abstract:
  This report summarizes a comprehensive research effort to validate thresholds for performance-based guidelines and
  
  grading system for hot-poured asphalt crack sealants. A series of performance tests were established in earlier research and
  
  include the crack sealant bending beam rheometer (CSBBR), crack sealant direct tension test (CSDTT), the crack sealant
  
  adhesion test (CSAT), a rotational viscosity test, and a dynamic shear test. Validation was accomplished through an extensive
  
  field performance study incorporating a wide spectrum of commonly used sealants installed in eight test sites around the United
  
  States using two basic treatment methods: (1) clean and seal, and (2) rout and seal. Performance of these sealants and treatment
  
  methods were monitored for 3 years to quantify relative performance, primarily through adhesive and cohesive failures, as well
  
  as overband wear. Field samples were also collected from the sites to conduct laboratory testing to reflect in-service properties.
  
  A statistical method was used to develop correlations of the tests parameters with the field performance. The composite score
  
  approach, combining ranking and correlation, was used to develop a quantitative scale for determining the level of acceptance.
  
  Based on the composite score, a strong or acceptable correlation was obtained between field performance and laboratory test
  
  parameters. After the correlation between field performance and lab results was confirmed, the thresholds for test methods were
  
  selected or fine-tuned.
  
  An investigation was also conducted to evaluate the short-term and long-term aging effects of hot-poured crack sealants
  
  through a differential aging test. Rheological and mechanical properties of sealants at different aging stages were monitored to
  
  characterize the aging effects. Laboratory aging of sealants was studied using three different aging methods: kettle aging, melter
  
  aging, and vacuum oven aging (VOA). The aging index was used to evaluate the effect of these aging methods. By a
  
  comparison of the stiffness master curves obtained from the CSBBR test for field-aged samples and laboratory-aged samples,
  
  VOA was validated as a reasonable aging method for simulating 2 to 5 years of field aging.
  
  The research proposes new guidelines for full implementation as AASHTO specifications. In addition to validated and
  
  revised thresholds for existing protocols, the research proposed a modified adhesion test and a simplified test for tracking
  
  resistance. Close inspection of the installation techniques and early performance feedback also supported the development of
  
  guidelines for crack sealant installation and application.
  
  
• Format:
  PDF
• Funding:
  98160
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:dc6fc410cced57b0ba0b612d116482cbec0a59f42195dfd78ed930f274a3e098cbfe464dfbd2a2c4021216109dab5bd77fc37a553b8cbcebffbcda98dd95a4bd
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/32400/dot_32400_DS1.pdf
• File Type:
  [PDF - 3.17 MB ]