joints are formed primarily between two batches of concrete where the
placement of the second batch has been delayed and the initial placed
compacted concrete has started to set.
basic rule is to try to avoid cold joints by pouring straight through
job is finished.(or plan for a proper construction joint)
full knitting together of the two batches of concrete under vibration
to form a
homogeneous mass is therefore not possible, unlike the compaction of
workable batches of concrete. This could be a potential plane of weakness.
joints, unlike cracks that form in hardened concrete through tensile
are not gaps in the concrete but merely seams containing no appreciable
structure. They are usually linear, closely joined and bonded. However,
is a danger of small voids in areas where the concrete is not fully
as with any concrete pour.
cold joints are not a problem
structurally if the joint is in compression.
the location of the joint within the structure, the structural function
element and aesthetics need to be considered when assessing a cold