Description
Slump Cone with tamping Rod & base plate
Consistency of concrete is another way of expressing workability but it is more
confined to the parameters of water content. Thus, concrete of the same consistency
may vary in workability. One test which measures the consistency of concrete is the
slump test. It does not measure the workability of concrete but it is very useful in
detecting variations in the uniformity of a mix of given nominal proportions.
Mixes of stiff consistency have zero slump. In this dry range no variation can be
detected between mixes of different workability. In a lean mix with a tendency to
harshness a true slump can easily change to the shear slump or even to collapse.
Too high or too low a slump gives
immediate warning and enables the mixer operator to remedy the situation
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