Abstract
Possible explanations regarding the often conflicting views on the effect of drop height on relative density of pluviated sand samples are presented. Assuming that the relative density achieved would be related to the particle energy at impact, it is shown theoretically that the drop height effects are of no significance for pluviation through water. In air pluviation, however, the relative density achieved depends very much on the drop height, although the range of drop heights over which densificiation is effective depends on the average particle size. Preliminary test results on a sand together with some test results from literature are presented in support of the ideas advanced.
