Nonuniformity among granular material specimens is a major reason for the dependence of the observed static/dynamic response during laboratory testing on the method of preparation. The authors of this paper describe a resin-impregnation/digital image analysis procedure to examine the uniformity of cohesionless specimens at microscopic, macroscopic, and global scales. The method relies on the equivalence between volume fraction and the expected value of area fraction where the area fraction of voids on two-dimensional sections is derived from a computer-based digital image analysis system. A sampling strategy is proposed that permits porosity variations in the vertical direction and in the radial direction of the specimen to be examined. After demonstrating the method on a typical specimen, investigators reveal that a much larger amount of nonuniformity exists when the soil is examined at microscopic level. A statistical procedure to assess the accuracy of a volume-fraction measurement using areal analysis is explained also. The accuracy and efficiency that the proposed method offers will make it valuable in examining the uniformity of specimens.


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 390-396
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00721038
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 30 1996 12:00AM