Answer Posted / narendra

(From wikie)
An expansion joint is an assembly designed to safely absorb
the heat-induced expansion and contraction of various
construction materials, to absorb vibration, or to allow
movement due to ground settlement or earthquakes. They are
commonly found between sections of sidewalks, bridges,
railway tracks, piping systems, and other structures.
Throughout the year, building faces, concrete slabs, and
pipelines will expand and contract due to the warming and
cooling through seasonal variation, or due to other heat
sources. Before expansion joint gaps were built into these
structures, they would crack under the stress induced.
The expansion joint can be as simple as a caulked
separation between two sections of the same materials. More
recently, expansion joints have been included in the design
of, or added to existing, brick exterior veneer walls for
similar purposes. In concrete and concrete block ("CMU")
construction, the term applied is control joint, but serves
a similar purpose.
Construction Joints
Construction joints (figures 7-36,7-37,7-38, and 7-39) are
made where the concrete placement operations end for the
day or where one structural element is cast against
previously placed concrete. These joints allow some load to
be transferred from one structural element to another
through the use of keys or (for some slabs and pavement)
dowels. Note that the construction joint extends entirely
through the concrete element.(
http://www.waybuilder.net/sweethaven/BldgConst/Building01/de
fault.asp?iNum=0603)

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