The bulk density of an aggregate is a measure of the mass of the material in a given volume. It is used to convert quantities by weight to volume, and also indicates the gradation and shape of the aggregate. Bulk density is necessary for dosing the mixture by volume, and is determined by multiplying the relative density (specific gravity) of the aggregate by the density of water. The bulk density or unit weight of an aggregate is the mass or weight of the aggregate that is required to fill a container of a specific unit volume.
This helps to establish weight-volume ratios for dosing the mixture, which is essential for construction work that requires a binding substance such as cement. The bulk density of aggregates can be determined by filling the container in three layers and tamping each layer with a 16 mm diameter rounded tip rod. Other factors that affect bulk density include particle size & shape, aggregate classification, and moisture content. The density of the sand can change if it is in a dry or wet state, as well as in the loose and compacted state. In conclusion, bulk density is an important factor in construction work, as it helps to determine weight-volume ratios for dosing mixtures.
It also indicates the gradation and shape of the aggregate, and can be affected by various factors such as particle size & shape, aggregate classification, and moisture content.