What is Honeycombing in RCC Structures?
Honeycombing is a structural defect of the RCC Structure.
Areas of the concrete surface
where,
-
The coarse aggregate is
prominently visible.
-
The course and rocky
appearance.
-
Giving a look of honeybees
nest.
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The surface looks very rough
with voids and gaps between concrete and the reinforcement.
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In other words, Honeycomb refers
to voids in concrete caused by “the mortar not filling the
spaces between the coarse aggregate particles”.
Concrete Honeycomb is normally seen at the column and beam
junction due to overcrowding of reinforcement bars which leads to poor concrete
fill.
Concrete Honeycomb not only reduces the strength also
provides passage for water which in turn corrodes reinforcement bars. When the
steel is exposed on the perimeter of the concrete due to deep concrete
honeycombing, corrosion will weaken the steel over time, causing
additional spalling and durability loss to the structure.
If not treated honeycombed surface, the RCC structure will not
perform adequately as per its design (structurally weak), will also allow
ingress of harmful agents like contaminated water and air through the
created voids affecting the durability of structure substantially.
Clients are frequently express concerns about the concrete
honeycomb texture that they see on the exterior face of structural elements.
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