EVALUATION OF SIX AC-20 ASPHALT CEMENTS BY USE OF THE INDIRECT TENSILE TEST

In a 1976 research project on pavement durability in northern Pennsylvania, six AC-20 asphalt cements from different sources were used in the construction of test pavements. Two test pavements developed extensive low-temperature-associated shrinkage cracking during the first winter. The indirect tensile test is used to characterize asphaltic concrete mixes that contain the six asphalt cements. Basic mix properties such as stiffness modulus, Poisson's ratio, tensile strength, and tensile strain at failure, are determined. The effect of temperature and asphalt rheology on these measured mix properties is evaluated. Within the temperature range used in the study (4 degrees C to 60 degrees C (39.2 degrees F to 140 degrees F), both temperature and asphalt penetration correlate very well with mix tensile strength and stiffness modulus. Mix tensile strength and stiffness modulus increase as temperature or penetration decreases. The two cracked test pavements have much higher stiffness moduli than the other test pavements, as indicated by measurements at 25 degrees C (77 degrees F) or lower temperatures. The stiffness moduli of the asphaltic concrete, which are computed by two indirect methods (Heukelom and McLeod modifications of the van der Poel method), compare reasonably well with the measured values in the 4 degrees C to 25 degrees C temperature range. /Auhtor/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 1-8
  • Monograph Title: Bituminous materials and skid resistance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00302228
  • Record Type: Publication
  • ISBN: 0309029597
  • Files: TRIS, TRB
  • Created Date: Feb 27 1980 12:00AM