Paving asphalts : reduction of oxidative hardening of asphalts by treatment with hydrated lime : a mechanistic study

Details

• Creators:
  Plancher, Henry ; Green, E. L. ; Petersen, J. Claine
• Corporate Creators:
  Laramie Energy Research Center
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Asphalt hardening
  • Asphalt additives
  • Calcium hydroxide
• Publication/ Report Number:
  FHWA-RD-77-147
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Interim report
• Contracting Officer:
  Zenewitz, J. A.
• Corporate Publisher:
  United States. Federal Highway Administration
• Abstract:
  This study showed that lime treatment removes polar, viscosity-building components and reduces the susceptibility of the asphalt to laboratory oxidative hardening. The beneficial effects of lime treatment in reducing asphalt oxidative hardening were attributed to two synergistic effects: (1) lime reduces the formation of oxidation products by the removal of oxidation catalysts or promoters and (2) lime reduces the sensitivity of the asphalt to these oxidation products by removing polar molecules that would otherwise interact with the oxidation products to cause an increase in viscosity. Relationships were observed between polar functional group interactions and changes in asphaltene content and viscosity.
• Format:
  PDF
• Funding:
  P.O. No. 6-3-0031 ; FCP Code 39A6-051
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/921/dot_921_DS1.pdf
• File Type:
  [PDF - 15.10 MB]
• Collection(s):
  Federal Highway Administration
• Main Document Checksum:
  urn:sha-512:beaab87f84215e4c5a7a15111761e175c38731015fefa83136508cbcc242894b70bba95d127b0c2e6b9cd38fbfa2e85a0cafcdcf4a5547b8972fe8f746c6116c