TENSILE BEHAVIOR OF SUBBASE MATERIALS UNDER REPETITIVE LOADING

RESULTS OF A STUDY OF THE FATIGUE CHARACTERISTICS OF ASPHALT TREATED, CEMENT-TREATED, AND LIME-TREATED SUBBASE MATERIALS INDICATED THAT THE INDIRECT TENSILE TEST CAN BE USED SATISFACOTRILY TO EVALUATE THE FATIGUE PROPERTIES OF TREATED MATERIALS UNDER REPEATED TENSILE STRESSES. IN ADDITION, THE GENERAL NATURE OF THE RELATIONSHIP BETWEEN APPLIED TENSILE STRESS AND FATIGUE LIFE WAS DETERMINED ALONG WITH THE IN- HERENT VARIATION ASSOCIATED WITH FATIGUE LIFE OF ASPHALT- TREATED MATERIALS. FOR THE ASPHALT-TREATED MATERIALS, THE RELATIONSHIPS BETWEEN TENSILE STRESS AND LOG FATIGUE LIFE WERE ESSENTIALLY LINEAR, WITH FAILURES OCCURRING AT TENSILE STRESSES GANGING FROM 8 TO 40 PSI, WHICH WERE APPROXIMATELY 6 TO 30 PERCENT OF THE STATIC INDIRECT TENSILE STRENGTH. SIGNIFICANT VARIATION IN FATIGUE LIFE OCCURRED, AND IT WAS FOUND THAT THE STANDARD DEVIATION VARIED LINEARLY WITH THE MEAN FATIGUE LIFE, WITH THE COEFFICIENT OF VARIATION RANGING FROM 30 PERCENT TO MORE THAN 75 PERCENT. RESULTS CONCERNING THE FATIGUE LIFE RELATIONSHIP FOR THE CEMENT-TREATED AND LIME-TREATED MATERIALS SUGGEST THAT THERE IS A CRITICAL STRESS LEVEL ABOVE WHICH THE FATIGUE LIFE IS VERY SHORT AND BELOW WHICH THE FATIGUE LIFE IS VERY LONG. THE TENSILE FATIGUE CHARACTERISTICS OF ASPHALT-TREATED MATERIALS WERE FOUND TO BE AFFECTED BY TYPE OF ASPHALT CEMENT, ASPHALT CONTENT, COMPACTION TEMPERATURE, AND MIXING TEMPERATURE. WITHIN THE RANGE TESTED, IT WAS FOUND THAT FATIGUE LIFE WAS INCREASED BY USING A MORE VISCOUS ASPHALT CEMENT, HIGHER COMPACTION TEMPERATURE, AND HIGHER MIXING TEMPERATURE. IT WAS ALSO CONCLUDED THAT THERE IS AN OPTIMUM ASPHALT CONTENT FOR MAXIMUM FATIGUE LIFE. /FHWA/

• Supplemental Notes:
  • Contract 3-8-66-98
• Corporate Authors:

  University of Texas, Austin

  Center for Highway Research, 200 West 21st Street
  Austin, TX  United States  78712
• Authors:
  • Moore, R K
  • Kennedy, T W
• Publication Date: 1971-10

Media Info

• Pagination: 87 p.

Subject/Index Terms

• TRT Terms: Fatigue (Mechanics); Fatigue tests; Load tests; Stabilized materials; Structural design; Tension; Testing
• Uncontrolled Terms: Fatigue life; Tensile stress; Treatment
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216006
• Record Type: Publication
• Source Agency: Federal Highway Administration
• Report/Paper Numbers: Intrm Rept
• Files: TRIS, ATRI, USDOT
• Created Date: Jul 22 1974 12:00AM