Testing fresh concrete - Part 2: Slump test

The slump test is sensitive to changes in the consistency of concrete which corresponds to slumps between 10 mm and 200 mm. Beyond these extremes the measurement of slump may be unsuitable and other methods of determining the consistency should be considered. If the slump continues to change over a period of 1 m after de-moulding, the slump test is not suitable as a measure of consistency. The test may not be suitable when the maximum size of aggregate in the concrete is greater than 40 mm.