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31 July 2011 | 1:54 PM
Using a frustum of a cone.
The container filled with concrete in three layer.
Each layer is tamped 25 times with standard steel rod.
After filling, the cone is slowly lifted and the unsupported concrete will now slump.
The decrease in the height is measured.
The value of slump changes with time after mixing owing to normal hydration process and evaporation of some of the free water.
The test performed within a fixed period of time.
Also advisable to delay testing for around 10 min after the addition of water to allow for the absorption of water by dry aggregate.
Important points in doing the slump test are:
o Before every test, wet the inside of the mould and its
o base to minimize the effect of surface friction on the
o “slump” value.
o Before lifting the mould, clean the area immediately
o around its base of accidently-dropped