LOSS OF DURABILITY IN BITUMINOUS PAVEMENT SURFACES - IMPORTANCE OF CHEMICALLY ACTIVE SOLAR RADIATION

THE LABORATORY THIN FILM TEST, BASED ON THE EFFECTS OF TIME, HEAT, AND AIR, PROVED UNRELIABLE IN PREDICTING HARDENING OF PAVEMENTS IN THE FIELD. A NEW HARDENING INDEX WAS DEVELOPED, BASED ON THE EFFECTS OF TIME, HEAT, AIR, AND MEASURED CONCENTRATIONS OF CHEMICALLY ACTIVE (ACTINIC) RADIATION. THIS INDEX WAS FOUND TO CORRELATE WELL WITH THAT OBTAINED FROM ASPHALTS EXTRACTED FROM PAVEMENT SURFACE COURSES AT SEVERAL TEXAS LOCATIONS. IT WAS FURTHER FOUND THAT 80% OF THE ASPHALTS SUBJECTED TO THE LABORATORY TEST SHOWED GOOD CORRELATION BETWEEN THE DEGREE OF HARDENING AND THE VANADIUM CONCENT, AS MEASURED BY NEUTRON ACTIVATION ANALYSIS. IN SOME ASPHALTS A LARGE PART OF THE VANADIUM ATOMS APPEAR TO BE CONSTITUENTS OF COMPOUNDS THAT MEDIATE CHEMICAL REACTIONS, ACCOMPANIED BY THE CONVERSION OF RADIANT ENERGY INTO CHEMICAL ENERGY. WORK ON THE USE OF ADDITIVES TO EITHER INHIBIT RADIANT ENERGY OR TO RENDER THE VANADIUM ATOMS INACTIVE IS RECOMMENDED.

  • Supplemental Notes:
    • RES REPT 127-3
  • Corporate Authors:

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  USA  76011
  • Authors:
    • Traxler, R N
    • SCRIVNER, F H
    • Kuykendall, W E
  • Publication Date: 1971-11

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 62 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00211737
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 18 1972 12:00AM