Acceptable slump for self consolidating grout

The slumped concrete takes various shapes and according to the profile of slumped concrete, the slump is termed as true slump, shear slump or collapse slump.If a shear or collapse slump is achieved, a fresh sample should be taken and the test repeated. 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.It can also be used as an indicator of an improperly mixed batch.The test is popular due to the simplicity of apparatus used and simple procedure.

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This cone is filled with fresh concrete in four stages.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 The slump test is suitable for slumps of medium to low workability, slump in the range of 5 – 260 mm, the test fails to determine the difference in workability in stiff mixes which have zero slump, or for wet mixes that give a collapse slump.It is limited to concrete formed of aggregates of less than 38 mm (1.5 inch).The British Standards do not explicitly specify that the cone should only be lifted vertically.The slump test in the British standards was first (BS 1881–102) and is now replaced by the European Standard (BS EN 12350-2).

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