STANDARDS: ASTM D2167, AASHTO T205
Balloon Density Apparatus is used to determine the in-situ density of compacted or ﬁrmly bonded soils.
Consists of a graduated cylinder 1596 ml capacity, housed inside an aluminium guard, a reversible rubber aspirator pump, a density plate 9” square and 12 rubber balloons. The principle of operation is similar to the sand replacement but the hole is ﬁlled by a rubber balloon where water is pumped. The amount of water can be
easily determined by the graduation of the cylinder.
3000 ml capacity. A metal cylinder is ﬁlled with water which is then pumped into a rubber membrane mounted on the base of the cylinder. The water pressure is controlled by a pressure gauge and the volume of the balloon is measured on the graduated piston stem.