The primary objectives of this investigation were to determine the modulus of elasticity and the fatigue life of in-service concrete under repeated loads, to estimate the variations in these properties, and to determine the changes in the modulus of elasticity caused by repeated loads. Cores from four recently constructed Portland cement concrete pavements in Texas were tested by using both the static and the repeated-load indirect tensile tests; and the tensile strength, fatigue lives, and moduli of elasticity and the variations of these properties were estimated. It was found that the slopes of the semilogarithmic relationships between fatigue life and stress-to-strength ratio were essentially equal for all four projects tested. The variations with respect to the semilogarithmic fatigue-life relationships for the three projects made with normal-mass aggregates were found to be very consistent. In this study, the fatigue-life relationships were different; whereas in previous projects, they were the same, which indicates the necessity for additional tests. The modulus of elasticity of the concrete decreased with an increase in the number of repeated loads--a decrease which was significant at 75 percent of the fatigue life; while the coefficient of variation for the resilient modulus of elasticity increased with increasing load applications. Finally, it was concluded that the strengths of the capped specimens tested ranged from 3.62 to 4.91 MPa (525 to 712 lbf/sq in); and the coefficients of variation of the capped tensile strengths ranged from 8 to 16 percent.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 8-10
  • Monograph Title: Analysis of pavement systems
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00193374
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 11 2000 12:00AM