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Concrete slumps can be managed by mixing at very high slump, this will leave the residual slump very standard.... It can also be control using concrete retarders/water reducer...
Keeping the temperature low is another good way of controlling slump loss.....
Only a true slump is of any use in the test. A collapse slump will generally mean that the mix is too wet or that it is a high workability mix, for which the slump test is not appropriate.[1][3] Very dry mixes having slump 0 – 25 mm are typically used in road making, low workability mixes having slump 10 – 40 mm are typically used for foundations with light reinforcement, medium workability mixes with slump 50 – 90 mm, are typically used for normal reinforced concrete placed with vibration, high workability concrete with slump > 100 mm is typically used where reinforcing has tight spacing, and/or the concrete has to flow a great distance.[5]:68
