Concrete should not segregate while mixing,
transporting, handling or placing. i.e. coarse aggregates particles separating
from cement mortar. Also concrete should not be too cohesive (sticky) that it
will not slide down a chute or flow when vibrated.
This is checked with the help of a 'Laddo' (ball)
test.
When concrete is unloaded, take a handful of
concrete and try to make a ball (ladoo).
If the ball does not form at all than it means that
the cohesion is very poor and the aggregates are segregating.
If the ball forms, throw it about 15 cm (6 inches)
and let it fall on the palm.
If the ball breaks, the cohesion is medium.
If the ball falls from 15 cm (6 inches) but does
not break, the cohesion is said to be good. This is the desired state of
cohesion.
Next, throw the ball for about 60 cm (2 feet). It
should break when it falls back on the palm.
POUR CARD NO.
SITE:
___________________
DATE:____________
STRUCTURAL MEMBER(S)
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QUANTITY IN CU MT
