The
junctions of tank wall and base slab with neat sketch
Joint
in the concrete introduced for convenience in construction at which special
measures are taken to achieve subsequent continuity without provision for
further relative movement, is called a construction joint. A typical
application is between successive lifts in a reservoir.
The position and
arrangement of all construction joints should be predetermined by the engineer.
Consideration should be given to limiting the number of such joints and to
keeping them free from possibility of percolations in a similar manner to
contraction joints.
A gap temporarily left
between the concrete of adjoining parts of a structure which after a suitable
interval and before the structure is put into use, is filled with mortar or
concrete either completely ( Fig. 5A) or as provided below, with the inclusion
of suitable jointing materials ( Fig. 5B and SC). In the former case the width
of the gap should be sufficient to allow the sides to be prepared before
filling.
Where
measures are taken for example, by the inclusion of suitable jointing materials
to maintain the water tightness of the concrete subsequent to the filling of
the joint, this type of joint may be regarded as being equivalent to a
contraction joint ( partial or complete ) as defined above.
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