STUDIES OF THE HARDENING PROPERTIES OF ASPHALTIC MATERIALS

THE HARDENING PROPERTIES OF A LARGE NUMBER OF ASPHALTIC MATERIALS WERE STUDIED. A TEST METHOD WAS DEVELOPED IN WHICH MOLDED-OTTAWA SAND ASPHALT SPECIMENS WERE WEATHERED IN AN OVEN AT 325 F. FOR DIFFERENT PERIODS OF TIME AND THEN TESTED FOR COMPRESSIVE STRENGTH WITHOUT LATERAL SUPPORT. THE BASIS FOR THIS PROCEDURE IS THE KNOWLEDGE THAT THE COMPRESSIVE STRENGTH OF MOLDED MIXTURE OF ASPHALT AND OTTAWA-SAND, WHEN TESTED WITHOUT LATERAL SUPPORT, IS A MEASURE OF THE HARDNESS OF THE ASPHALTIC BINDER. TESTS ON ASPHALTS RECOVERED FROM OVEM WEATHERING MIXTURES SHOWED THAT THE COMPRESSIVE STRENGTH WAS CLOSELY RELATED TO THE CONSISTENCY OF THE CONTAINED ASPHALT. EXPOSURE OF THE ASPHALT TO THE THIN-FILM OVEN TEST AT 325 F PRODUCED CHANGES IN THE ASPHALTS SIMILAR TO THOSE PRODUCED BY THE OVEN WEATHERING OF SAND-ASPHALT MIXTURES. THE THIN-FILM OVEN TESTS INDICATE RELATIVE RESISTANCE OF ASPHALTIC MATERIALS TO HARDENING. SINCE THE THIN-FILM OVEN TEST IS RELATIVELY IN PROCEDURE, IT SHOULD BE HIGHLY VALUABLE FOR DETERMINING THE RELATIVE RESISTANCE OF ASPHALT MATERIALS TO HARDENING.

• Supplemental Notes:
  • Vol 21, P 18
• Authors:
  • Pauls, J T
  • Welborn, J Y
• Conference:
  • Assoc Asphalt Paving Technol Proc
• Publication Date: 1952

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt hardening; Asphaltic sand; Binders; Compression tests; Consistency; Oven tests; Ovens; Test procedures; Thin films; Weathering
• Uncontrolled Terms: Thin film oven test
• Old TRIS Terms: Compressive strength tests; Resistance
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00210847
• Record Type: Publication
• Files: TRIS
• Created Date: May 6 1994 12:00AM