Workability of Fresh Concrete by Slump Test
Aim:
To determine the
workability of fresh concrete.
Apparatus required:
1.Slump cone (dimensions
are
Top Diameter – 10cm
Bottom Diameter –
20cm
Height – 30cm)
2. Tamping rod
3. Oil
4. trowel
Procedure
·
The internal surface of the mould is thoroughly
cleaned and applied with a light coat of oil.
·
The mould
is placed on a smooth, horizontal, and rigid surface.
·
The mould
is then filled in three layers with freshly mixed concrete, each approximately
to one-third of the height of the mould.
·
Each layer is tamped 25 times by the rounded end
of the tamping rod (strokes are distributed evenly over the cross section).
·
After the top layer is rodded, the concrete is
struck off the level with a trowel.
·
The mould is removed from the concrete
immediately by raising it slowly in the upward direction.
·
The difference in level between the height of
the mould and that of the highest point of the subsided concrete is measured.
·
This difference in height in mm is the slump value
of the concrete.
·
This process is done repeatly by adding various water contents.
Types of slumps:
True slump
Shear slump
Collapse
Result:
For dry sample, the slump value will be in
the range of 25-50 mm .
For wet sample, the slump value will be in
the range of 150-175 mm
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