I was arguing with my fellow engineers (all novices) about the definition and function of expansion joint.He was suggesting that the prime function of the expansion joint is it acts as a temporary separator between two concrete surfaces during construction. To me he was implying that even if there is no filler but an initial gap say 25mm (one inch) is left behind it can still be called an expansion joint . Is this correct?
We both agree that expansion joint is provided to allow some movement (expansion of the structure) . I think this is quite obvious.
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