ANALYSIS OF FATIGUE OF A SAND-ASPHALT MIXTURE

RESULTS ARE REPORTED OF A PILOT STUDY FOR LARGE SCALE INVESTIGATION OF THE FATIGUE OF FLEXIBLE PAVEMENTS. THE CONCEPT OF FATIGUE FROM THE FRACTURE MECHANICS VIEWPOINT IS DISCUSSED. VARIOUS MOLECULAR AND PHENOMENOLOGICAL DAMAGE CONCEPTS RELATED TO THE FATIGUE-FRACTURE AND CREEP RUPTURE ARE PRESENTED. CONCLUSIONS MADE IN THIS STUDY FOR A SAND- ASPHALT MIXTURE TESTED AT A LIMITED RANGE OF TEMPERATURES ARE: (1) THE DEFORMATION AMPLITUDE AT FAILURE IS SHOWN TO BE NON-LINEARLY RELATED TO THE APPLIED LOAD AMPLITUDE, (2) THE CRITICAL STRESS INTENSITY FACTOR IS THE FAILURE CRITERION OF BOTH STATIC FRACTURE AND FATIGUE, (3) THE RATE OF CRACK GROWTH IS PROPORTIONAL TO THE FOURTH POWER OF THE STRESS INTENSITY FACTOR, AND (4) THE STRESS DEPENDENCY OF DAMAGE IN FATIGUE IS RELATED TO THE SIXTH POWER OF STRESS AT THE CRACK TIP. EXAMPLES ARE GIVEN IN THE DISCUSSION BY MR. VALAYER OF STUDIES CONDUCTED WITH AN EQUIPMENT DESIGNED AND BUILT TO ACTUATE SAMPLES OF ASPHALT CONCRETE IN A THERMOREGULATED TRIAXIAL CELL. THE EXAMPLES ILLUSTRATED ARE RESULTS OF ALTERNATE TENSION-COMPRESSION TESTS IN A QUASI-HOMOGENEOUS STRESS-STATE, WITH NO CONFINING PRESSURE.

• Supplemental Notes:
  • Vol 38, pp 495-518, 16 FIG, 46 REF
• Authors:
  • Adeh, K
  • Ramsamooj, D V
  • Fletcher, T A
  • Valayer, P J
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1969-2

Subject/Index Terms

• TRT Terms: Asphalt concrete; Asphaltic sand; Compression tests; Fatigue (Physiological condition); Flexible pavements; Fracture mechanics; Stress ratio; Tension tests
• Uncontrolled Terms: Fracture
• Old TRIS Terms: Compressive strength tests
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00211509
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 27 1970 12:00AM