What is the function of a formwork in concrete construction?

The function of formwork in concrete construction is primarily to hold the wet concrete in place until it cures. When concrete is poured, it is in a liquid state and needs to be contained in a specific shape to form the desired structure, whether that be walls, slabs, or any other concrete component. Formwork provides this necessary containment, supporting the concrete as it hardens and gains strength.

Once the concrete has set and reached the appropriate strength, the formwork can be removed. The quality of the formwork also has an impact on the final finish and structural integrity of the concrete, since it helps prevent the displacement of the poured concrete.

The other choices represent functions that are not applicable to formwork. For instance, adding strength to the concrete mix is achieved through the materials used in the mix itself, not through the formwork. Insulating the concrete from the ground or cooling it during curing also fall outside the purpose of formwork, as these aspects are typically managed through other methods, such as insulation blankets or cooling systems. Thus, the primary role of formwork remains to ensure that the wet concrete stays in the intended shape until it solidifies.