This paper summarizes the findings of a study conducted to evaluate the tensile strength, modulus of elasticity, and Poisson's ratio of black-base materials and to determine the variations in these properties for use in elastic and stochastic pavement design systems. Field cores of black-base materials from 10 recently completed highway pavement projects in Texas were tested by using the indirect tensile test. Mean values for the tensile and elastic properties were established, and the variation about these mean values was estimated. The average tensile strength, modulus of elasticity, and Poisson's ratio for all 10 projects were 105 psi (723.95 kN m squared, 58.2 x 10 cubed psi (401.28 x 10 cubed kN/m squared, and 0.27 respectively; however, the mean values for the individual projects varied considerably. Tensile strengths ranged from 84 to 157 psi (579.16 to 1082.48 kN/m squared), moduli ranged from 38.6 x 10 cubed to 91.5 x 10 cubed psi (266.14 x 10 cubed to 630.87 x 10 cubed kN/m squared, and Poisson's ratios ranged from 0.16 to 0.34. Significant variation also occurred in each project, and the magnitude of this project variation differed. The average coefficients of variation for the 10 projects were 28 percent for strength, 33 percent for modulus, and 25 percent for Poisson's ratio. The ranges of project coefficients for strength, modulus, and Poisson's ratio were 14 to 27 percent, 24 to 59 percent, and 38 to 67 percent respectively. Because of the significant project differences, it was concluded that a single variation value could not be established for the state and that characteristics values were project dependent.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 31-40
  • Monograph Title: SOIL MECHANICS
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00081327
  • Record Type: Publication
  • ISBN: 0309023548
  • Files: TRIS, TRB
  • Created Date: Mar 26 1975 12:00AM