Unit Weight of Aggregate:
On the basis of unit weight (i.e. density) the aggregates are classified as normal-weight, lightweight and heavyweight aggregates. The criteria for classifying them into these categories are shown in Table below.
[Note: Unit weight of concrete is 2400-2500 kg/m3.]
Comments
Special care and strict quality control is exercised for concreting with light and heavy weight aggregates because use of such aggregates may adversely effect workability and have tendency of segregation. Concrete with light-weight aggregates is used for reducing the self weight of the structure particularly in the case of high rise buildings.
Light-weight aggregates being porous and weak are more suitable for nonstructural elements. Concrete along with heavy-weight aggregates is used for nuclear radiation shield or high strength concrete.