AIM:-
- To Determine of dry loose bulk density of course and fine aggregates,
- As per IS : 2386-( Part-3) -1963.
- Sampling Code IS : 2430,
Read More Material than 75μ of Coarse Aggregate
APPARATUS:-
- Weight Balance accuracy 0.5%.
- Temping road - 16mm diameter 600mm long,
- Enamel Tray.
- Steel Scoop.
- Cylindrical Container - 3, 15, 30 Ltr, shown in table.
- SIZE OF CONTAINER FOR BULK DENSITY TEST
| SIZE OF LARGEST PARTICLES IN (MM) | NOMINAL CAPACITY (LTR) | IN SIDE DIAMETER (CM) | IN SIDE HIGHT (CM) | THICKNESS OF METAL MINIMUM |
|---|---|---|---|---|
| Under 4.75 mm. | 3 | 15 | 17 | 3.15 |
| Over 4.75mm to 40mm | 15 | 25 | 30 | 4.0 |
| Over 40mm | 30 | 35 | 31 | 5.0 |
Read More sieve analysis of fine Aggregates
PROCEDURE:-
- Condition of specimen: the test shall be normally be carried our on dry material when determining the voids. But when bulking tests are required material with a given percentage of moisture may be used.
LOOSE BULK DENSITY:
- The measure shall be filled to overflowing by means of a shovel or scoop, the aggregate being discharged from a height not exceeding 5 cm above the top of the measure.
- Care shall be taken to prevent, as for as possible, segregation of the particle sizes of which the sample is composed.
- The surface of the aggregate shall then be levelled with a straightedge.
- The net weight of the aggregate in the measure shall than be determined and the bulk density calculated in kilogram per litre.
- The measure shall be filled about one third full with thoroughly mixed aggregate and trapped with 25 stokes of the rounded end of the tamping rod.
- A further similar quantity of aggregate shall be aggregate shall be added and a further tamping of 25 stokes given.
- The measure shall be finally be filled to over flowing, tamped 25 times and the surplus aggregate struck off, using the tamping rod as a straightedge.
- The net weight of the aggregate in the measure shall be determined and the bulk density calculated in kilogram per litre.
CALCULATIONS:-
- ( Container + Sample wt) --- Empty container wt
- Container Volume
| SL No | PARAMETERS | I | II | III |
|---|---|---|---|---|
| 1 | Wt of Empty container (A) | |||
| 2 | Wt of Container+Sample (B) | |||
| 3 | Volume of Container | |||
| 4 | DLBD -- KG/LTR B - A / V = | |||
| 5 | AVERAGE |
CRITERIA:-
- COARSE AGGREGATES:- 1200 to 1750 kg/m³
- FINE AGGREGATES :- 1600 to 1840 kg/m³