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what is meant by expansion joints in concrete structures?
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Answer Posted / ashish sati
An expansion joint or movement joint is an assembly
designed to safely absorb the heat-induced expansion and
contraction of various construction materials, to absorb
vibration, to hold certain parts together, or to allow
movement due to ground settlement or earthquakes. They are
commonly found between sections of sidewalks, bridges,
railway tracks, piping systems, ships, 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.
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