What type of concrete forms are one-time used and require bracing?

Laminated fiber tubes are a type of concrete form designed for one-time use and often require bracing to provide stability during the curing process. These tubes are typically used for creating cylindrical shapes such as columns, piers, or footings. Their one-time-use characteristic makes them different from other forms that may be reusable, such as wood or steel forms.

The bracing is necessary because laminated fiber tubes, due to their lightweight and generally less rigid nature compared to other materials, need additional support to prevent deformation while the concrete is poured and begins to set. Once the concrete is cured and the structural integrity is established, the tubes can be removed, making them efficient for certain construction applications where quick forms are needed.

While wood forms, steel forms, and plastic sheeting can all provide support for concrete, they are not specifically designed as one-time use products in the same way that laminated fiber tubes are. Wood forms, for example, can be reused multiple times unless damaged, while steel forms are also often reused due to their durability. Plastic sheeting does not function as a structure on its own to shape poured concrete and would not fulfill the criteria for this question.