what is difference between expansion and construction joint?

Answer Posted / sanjeev786

A construction joint is required to allow the structure to
be built. Say there is an existing structure in the way of a
wall. Part of the wall is built, then later the existing bit
is removed, and the rest of the wall constructed. The place
where the first and second parts of the wall meet is a
construction joint. This kind of joint is usually built so
that no movement is allowed.

An expansion joint is one that allows movement between the
two elements. There will be a comparitely soft material,
such as rubber, asphalt or impregnated board placed between
the parts. If it is concrete construction, any reinforcing
bars will be arranged to allow movement. In most cases, if
movement was prevented, the structure would crack or buckle.
The joint allows controlled movement.

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