Answer Posted / rubes

"slump" is vertical settlement of concrete after the mould
is removed.
a concrete with 0-25mm slump has a low degree of
workability and with 175 mm slump a high degree of
workability which is not suitable for vibrations.
for foundations and footing walls, other sub structures,
26-50mm of slump is permissible (without vibration) and with
vibration a slump of 40-115 is permissible

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