Bulk density of Aggregate. It is the weight of aggregate needed to fill a unit volume of the container. It helps to convert quantities by weight to by volume. It also indicates the aggregate grading and shape. Bulk Density Weight of aggregate / Container of unit volume. Unit Kg/m 3 or lb/ft 3. Essential PointsBulk Density of Aggregate 1 The bulk density or unit weight of an aggregate is the mass or weight of the aggregate that required to fill a container of a specified unit volume. Bulk Density Mass / volume. Key Features If the volume is unit then, Bulk Density Mass. Unit in kg/m 3 or lb/ft 3.