TEST PROCDEURE FOR DETERMINATION OF DLBD & VOIDS: COARSE AND FINE AGGREGATES
Relevant IS Code – IS: 2386 (Pt. – III) – 1963
Method for
finding out D.L.B.D.
Bulk
density or unit weight is the weight of the material in a given volume. It is
usually expressed in kg per liter.
Take a mould of known volume and fill the same using a scoop
or shovel with the aggregate without compacting or without dropping from a
great height. It should be dropped from a height not exceeding 5 cm. It should
be loosely packed. Fill the mould till the top surface is in one plane. Remove
the excess material with a straight edge and weigh the aggregate in the mould.
\[{D.L.B.D.} = {{ Weight ~of~ loose ~aggregate ~in~ the~ mould} \over {Volume~ of~ mould} }\]
\[{Percentage ~of ~voids} = {{ G_{s} – Y} \over {G_{s}} }\]
\[Where,\]
\[G_{s} = Specific gravity of aggregates \]
\[ Y = DLBD~ in ~kg / ~liter. \]
Generally
test cube molds are used for finding out the D.L.B.D. of fine aggregate and a
farma of known volume is used for finding out D.L.B.D. of coarse aggregate. The
following containers also may be used as per IS code.
Size of
Container for Bulk Density Test
Size of Largest Particles
|
Nominal Capacity
(liter)
|
Inside Diameter
(cm)
|
Inside Height
(cm)
|
Thick. of Metal
(mm)
|
4.75 mm and under
|
3
|
15
|
17
|
3.15
|
Over 4.75 mm to 40 mm
|
15
|
25
|
30
|
4.00
|
Over 40 mm
|
30
|
35
|
31
|
5.00
|
Damp sand
should not be taken for finding out D.L.B.D. but only dried sand should be
taken for this purpose.
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