How many kinds of slumps are there in slump tests?

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  1. True slump: In a true slump concrete just subsides shortly and more or less maintain the mould shape. This type of slump is most desirable.
  2. Shear slump: If one-half of the cone slides down in an inclined plane, it is called a shear slump. Shear slump indicates lack of cohesion in the concrete mix. Shear slump may occur in the case of a harsh mix.
  3. Collapse slump: In this case, fresh concrete collapses completely.
Zero Slump: If concrete maintains the actual shape of the mould, it is called zero slump which represents stiff, consistent and almost no workability.

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