ASPHALT HARDENING BY GASEOUS OXIDANTS: THE RELATIONSHIP BETWEEN SOFTENING POINT AND CHEMICAL CHANGE AS MEASURED BY INFRARED SPECTROSCOPY

THE USE OF OXIDIZED ASPHALTS HAS BEEN INCREASING STEADILY, AND MUCH WORK HAS BEEN REPORTED ON THE PROCESS OF BLOWING ASPHALT FLUXES TO PRODUCE A COATING-GRADE ASPHALT. PREVIOUS WORK WAS REVIEWED IN WHICH ASPHALT FLUXES WERE TREATED WITH VARIOUS OXIDANTS (OXYGEN, OZONE, AIR, AND NITROGEN OXIDES) AT RELATIVELY MILD TEMPERATURES, AND COMPLEX CHANGES TAKING PLACE DURING THE HARDENING PROCESS WERE STUDIED BY INFRARED SPECTROSCOPY. THIS WORK WAS EXTENDED TO INCLUDE OTHER GASEOUS MIXTURES (SULFUR DIOXIDE, SULFUR DIOXIDE-AIR, AND NITROGEN DIOXIDE-AIR). THE STUDY OF THE EFFECTS OF THE GASEOUS OXIDANTS ON THE SOFTENING POINTS OF THE ASPHALT FLUXES WITH TIME OF BLOWING INDICATED THAT, IN EVERY CASE, THE RATE OF SOFTENING POINT INCREASE WAS GREATER THAN THAT OBTAINED WHEN AIR ALONE WAS USED TO HARDEN THE FLUX, INFRARED SPECTRAL ANALYSIS, IN WHICH CHANGES IN FUNCTIONALITY ARE DETECTED, WAS FOUND TO BE A CONVENIENT METHOD TO FOLLOW THE ASPHALT HARDENING PROCESS. /AUTHOR/

• Supplemental Notes:
  • Vol 2, No 3, PP 581-596, 10 FIG, 1 TAB, 10 REF
• Authors:
  • Campbell, P G
  • Wright, J R
• Publication Date: 1967-9

Media Info

• Serial:
  • Journal of Materials
  • Publisher: American Society for Testing and Materials (ASTM)

Subject/Index Terms

• TRT Terms: Asphalt; Chemical reactions; Concrete hardening; Gases; Hardness; Infrared spectroscopy; Oxidizing agents; Softening point
• Old TRIS Terms: Blown asphalt
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00210686
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 8 1994 12:00AM