Abstract
ABSTRACT The frequency distribution of void ratio was experimentally determined for three actual granular materials having different grain characteristics, i. e., glass beads (spherical grains), Ottawa sand (rounded grains), and Crystal silica sand (angular grains). The distributions were obtained by means of thin sections and a computer-controlled image analyzer. Samples were prepared at different relative densities. The structure of the samples was fixed with epoxy-resin in a specially fabricated mold made of plexiglass. For all samples, the frequency distributions of void ratio were skewed towards the denser void ratios. Further, the distributions for glass beads were not only skewed toward the denser void ratios, but were also very well approximated by the negative exponential distribution. The frequency distribution of both Ottawa and Crystal silica sands was modeled by the beta distribution in this study. The deviation of void ratio was found to increase with both void ratio of the sample and angularity of grains. In addition, it was found that the angle of internal friction was higher for materials composed of angular grains, even though the deviation of void ratio was the greatest in this material.
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