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Fingertip Consistence tolerance - slump test
Description

Consistence, measured using the slump test (BS EN 12350-2), is either specified as a class or target. Although a supplier will endeavour to provide the required value or range, deviations in production and sampling apply. The following tables give the maximum allowable deviation based on a spot sample taken from the initial discharge of a ready-mixed concrete truck. 

Class

Slump range

Max. allowable deviation on range limit (mm)

S1 10 - 40     -10, +30
S2

50 - 90

    -20, +30
S3 100 - 150     -20, +30
S4 160 - 210     -20, +30

Target slump (mm) Max. allowable deviation on target value (mm)
  <40     -30, +40
  50 - 90     -40, +50
  > 100     -50, +60

For a slump class S2 or S3 you could expect a measured slump (spot sample from initial discharge) to fall within the range of 30 - 120mm and 80 - 180mm respectively, whereas for target slumps of 80mm and 120mm, the ranges will be 40 - 130mm and 70 - 180mm respectively.



Slump test apparatus
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Slump test; assessment
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Acknowledgement The Concrete Society
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Identity testing of fresh concrete for properties other than strength
 
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