Acceptable slump for self consolidating grout
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The test is carried out using a metal mould in the shape of a conical frustum known as a slump cone or Abrams cone, that is open at both ends and has attached handles.The tool typically has an internal diameter of 100 millimetres (3.9 in) at the top and of 200 millimetres (7.9 in) at the bottom with a height of 305 millimetres (12.0 in).
It is limited to concrete formed of aggregates of less than 38 mm (1.5 inch).
The cone is placed on a hard non-absorbent surface.
This cone is filled with fresh concrete in four stages.
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.
Concrete can have different properties depending upon the mixture that is used in creating it, which contains cement, chemical admixtures, and aggregates.
These ingredients are mixed with water to create concrete which is used as a primary construction material in buildings.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.The test should be carried out by filling the slump cone in three equal layers with the mixture being tamped down 25 times for each layer.There are many tests for evaluating slump in concrete: the flow table test (DIN 1048-1) uses similar, but differently-sized, apparatus, but the table on which the slump cone is placed is dropped several times after the slump cone is removed, and the measurement is of the diameter of the sample, not the height.The American standards explicitly state that the slump cone should have a height of 12-in (300 mm), a bottom diameter of 8-in (200 mm) and an upper diameter of 4-in (100 mm).