What is Honeycomb?
Honeycombs are hollow spaces and cavities left in concrete mass on the surface or inside the mass where concrete could not reach.
These look like honey bees nest.
Causes of honeycomb in Concrete:
1 .Insufficient compaction to concrete.
2 .Less cover to reinforcement bars.
3 .Improper Workability in concrete
4 .Concrete already set before placing .
5 .High concrete free fall while pouring
6 .Form work not watertight/rigid.
7 .More coarse aggrgegates than designed mix proportions and over sized aggregates.
8 .Improper placement of bars at column and beam junction.
9 .Addition of more water than designed at site for achieving workability.
10 .Steel congestion not allowing concrete flow to all corner.
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