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The primary purpose of formwork in concrete construction is to shape and support wet concrete. When concrete is poured, it is in a fluid state, and formwork acts as a mold that holds the concrete in the desired shape until it hardens. This allows for the precise formation of structural elements like walls, slabs, and columns.

Formwork must be designed to withstand the pressure exerted by the wet concrete and to maintain its shape during the curing process. Once the concrete has set and gained sufficient strength, the formwork can be removed. This process is crucial for achieving the intended dimensions and aesthetics of the finished structure, making it an essential component in concrete construction.

Other options like strengthening the concrete mix, providing insulation, or facilitating drainage do not align with the primary functional role of formwork, which is focused specifically on shaping and supporting the concrete until it can hold its own weight.