STANDARD
- IS: 2386 (Part3) 1963.
OBJECTIVE
- To determine the unit weight or bulk density and voids of aggregate.
APPARATUS
- Balance sensitivity to 0.05 grams.
- Cylindrical container should be water tight, non-corrosive, provided with handles and shall comply to the following requirements given in Table: 1.
Table: 1 Size of containers for bulk density
| Size of largest particle in mm |
Nominal |
Inside |
Inside Height |
Thickness of |
| Under4.75 |
3 |
15 | 17 |
3.15 |
| Over 4.75 to 40 |
15 |
25 | 30 |
4.00 |
| Over 40 |
30 |
35 | 31 |
5.00 |
- Steel tamping rod of 16 mm diameter and 600 mm long rounded at one end. Table: 1 Size of containers for bulk density
PROCEDURE
- Take representative sample of aggregate as required for the test according to maximum size of aggregate and the container required from Table: 1.
- Determine the empty weight (M1) and the volume (V) of the cylinder at 27°C.
Compacted Weight
- Fill the container in three equal layers, each layer being subjected to 25 strokes with the rounded end of the tamping rod.
- Struck off the surplus aggregate using the tamping rod as a straight edge and weigh (M2).
Loose Weight
- Over flow the container by pouring the material from a height of not exceeding 5 cms above the top of the cylinder.
- Struck off the surplus aggregate using the tamping rod as a straight edge and weigh (M3).
CALCULATIONS
- Bulk Density (Compacted), γc = (M2-M1)/V Kg I lit or grams / cc
- Bulk Density (Loose), γl = (M3-M1)/V Kg/lit or grams/cc
- Voids=((Gs- γ)/ Gs) x 100
Gs = Specific Gravity of aggregate.
y = Bulk density of aggregates.
REPORT
- Report the bulk density in Kg / lit or grams / cc to the nearest second decimal.
- Report the voids as a percentage to the nearest second decimal.
DETERMINATION OF BULK DENSITY AND VOIDS
IS:2386 (Part 3)1963
| Description | Units | Test 1 | Test 2 |
| DETERMINATION OF DENSITY (COMPACTED) | |||
| Weight of empty container (M1) | gms | ||
| Weight of container with sample (M2) | gms | ||
| Weight of sample(Compacted) (M2-M1) | gms | ||
| Volume of the container (V | cc | ||
| Bulk density = (M2-M1)/V | gms /cc | ||
| Average Bulk density | gms /cc | ||
| DETERMINATION OF DENSITY (LOOSE) | |||
| Weight of empty container (M1) | gms | ||
| Weight of container with sample (M2) | gms | ||
| Weight of sample (Loose) W1=M2-M1 | gms | ||
| Volume of the container (V) | cc | ||
| Bulk density Y = (M2-M1)/V | gms /cc | ||
| Average Bulk density | grns icc | ||
| DETERMINATION OF VOIDS | |||
| Specific gravity of aggregates (Q) | — | ||
| Bulk density of aggregates (y) | gms / cc | ||
| Voids =( (Gs– γ) / Gs }x 100 | % | ||
| Average Voids | % | ||
| Remarks:
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