SLUMP TEST
OBJECTIVE
The easiness with which the
concrete is placed in the formworks and the compacted is termed as the
workability of concrete. This test is performs during the
progress of work to check hour-to-hour variation in the workability (SLUMP) at
the site work.
APPARATUS
- Slump cone,
- Scale for
measurement,
- Temping rod
(steel)
Fig:-Showing
Slump cone
PROCEDURE
- The mould is placed on a smooth, flat, & non-absorbent surface.
- The mould held firmly is place by standing on the foot pieces.
- The mould is filled with concrete to about ¼ (7.5 cm from bottom) of
it height.
- The concrete is compacted with the help of the steel rod 60 cm long
& 16 mm diameter. (Compacting should be uniformly).
- Concrete should be tempered 25 times by the temping rod. After
compacting uniformly, the mould
is filled to about ½ of its height. (Second 7.5 cm from the first).
- This layer is also compacted. Again the mould is filled to about ¾
of its height & the concrete is compacted as described above.
- Than the mould is filled up to the top and the concrete is finally
compacted. After this, the concrete should be struck off & level with
a trowel. Any mortar, which has leaked out between the base plate and the
mould, is cleaned away.
- After this the mould is immediately removed off from the concrete.
In the vertical direction on the removal of the mould, the concrete will
subside.
- The vertical distance by which the mould subsides is recorded as the
slump value of the mix is in (mm).
- The degree of workability is determined from the slump value as-
Table:- Degree
of workability (Slump value).
|
|
Slump value in (mm)
|
Degree of workability
|
|
1.
|
0-25
|
Very low
|
|
2.
|
25-50
|
Low
|
|
3.
|
50- 80
|
Medium
|
|
4.
|
80-100
|
High
|
RESULT
Here
we found the avg. slump of the concrete used is mm. So the degree of
workability is of the used concrete
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