Bulk density of aggregates is the mass of aggregates required to fill the container of a unit volume after aggregates are batched based on volume. Here is a method of determining the loose and rodded bulk density of aggregates.

**Test Standard :** IS 2386-Part 3: 1963

**Test Apparatus loose and rodded bulk density of aggregates : **

- Weighing Balance.
- Cylindrical containers of Volume 3.0 liter, 15.0 liter & 30-liter capacity
- Tamping rod of 16 mm diameter & 60 cm long, rounded at one end.

**Calibration of Cylindrical containers **

The cylindrical container calibrated by water. To calculate actual volume of container, fill the container to full height of container and measure the weight of the water at 27 °C. Assume the density of water as 1kg/lit at 27 °C and find the volume of the container (V, ltr)

**Test procedure**

**Rodded bulk density of Fine aggregates:**

- Take the air dry sample of aggregate by quartering method.
- 3.0 litre capacity cylindrical container shall be filled in 3 layers of equal height with aggregate and tamp with 25 number of strokes in each layer with the rounded end of the tamping rod.
- The net weight of the aggregates shall be record (say W1, Kg).

**Rodded bulk density **= W1/V (Kg/Ltr)

**Loose bulk density of Fine aggregates:**

- Cylindrical container of 3.0-liter capacity filled by aggregate to overflowing by scoop.
- The aggregates being discharged from a height not exceeding 5.0 cm from top of the measure.
- Record the net weight of the aggregates (W2, Kg).

**Loose bulk density **= W2 / V (Kg/Ltr)

**Rodded bulk density of Coarse aggregates:**

- Take the air-dry sample of aggregate by quartering method.
- 15 .0 liter capacity cylindrical container shall be filled in 3 layers of equal height with aggregate and tamp with 25 number of strokes in each layer with the rounded end of the tamping rod.
- The net weight of the aggregates shall be record (W1, Kg).

**Loose bulk density **= W1/V (Kg/Ltr)

**Loose bulk density of Coarse aggregates:**

- Cylindrical container of 15.0 litre capacity filled by aggregate to overflowing by scoop.
- The aggregates being discharged from a height not exceeding 5.0 cm from top of the measure.
- Record the net weight of the aggregates (W2, Kg).

**Rodded bulk density **= W2/V (Kg/Ltr)

**Container size for bulk density test**

Size of Aggregate | Capacity of Container (Ltr) | Inside Diameter (Cm) | Inside height (Cm) |

4.75 mm and under | 3 | 15 | 17 |

Over 4.75 to 40 mm | 15 | 25 | 30 |

Over 40 mm | 30 | 35 | 31 |

**Container size for bulk density test**

Read more :

- Abrasion value test of aggregate
- Impact value test of aggregate
- Ten Percent fine value of Coarse Aggregate
- Method of crushing value test of aggregate
- Flakiness & elongation index (FI & EI) of coarse aggregate

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