Abstract
This study was carried out of investigate the aerated and tapped bulk density of some free-flowing glass beads and sands. Besides pure powders, blends were carefully prepared for the investigation of blend radio effects. Bulk densities were measured by standard test method It was found that the aerated bulk density of powders of small mean particle size was more sensitive to changes of external conditions such as tapping than powders of large mean particle size. A critical blend ratio was found to occur in every binary system tested at the point where the proportion of the blending partner of larger mean particle size was 10–30%. the flowability of a bulk of blended powder at this critical blend ratio would be at its minimum. This powderproperty was clearly reflected by the maximum ratio of tapped bulk density to aerated bulk density.
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