Concrete Honeycomb | Causes and Prevention Measures
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 bee's nests. Improper vibration and workability of concrete are the main causes of honeycombs in concrete.
Honeycombs that are on the sides are visible to naked eyes and can be detected easily as soon shuttering is removed. Honeycombs that are inside the mass of concrete can only be detected by advanced techniques like ultrasonic testing etc.
The prevention of honeycomb in concrete structures can save time and money, and help construct structurally sound concrete members. The prevention measures include proper compaction, use of rigid and waterproofing formwork, clean placement of steel bars, adequate concrete cover, etc.
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