Encase concrete properly

Most concrete structures that are built must be created using forms. But this formwork not only has the task to bring the concrete during processing in the right shape. Covering the concrete is accompanied by additional requirements, which we will then describe for you.

Various tasks of concrete formwork

The formwork is practically the negative mold to the later concrete part, which is installed or poured into it. In addition, the formwork takes on other important tasks:

  • shaping the concrete
  • derives the forces in the concrete
  • Vibrators for compacting concrete are often attached to the formwork
  • is included in the post-treatment
  • equipped with a surface structure also a design element
  • lost formwork can be part of the building construction

Massive forces that the formwork must derive

The fact that the concrete formwork is shaping the concrete is probably so logical for everyone. But in the other tasks that come to the shuttering, just do-it-yourselfers often know nothing about their importance. Especially liquid concrete, which is perhaps of liquid consistency, means enormous forces acting on the formwork. So the formwork must be provided accordingly with massive Schalankern. Under no circumstances may the formwork deform.

The formwork and compacting

For compacting concrete, either internal vibrators (vibrating bottles) or external vibrators are usually used. The latter are then attached to the formwork, so that from here the concrete can be compacted from the outside. However, excess water can be driven especially by the compression from the inside to the formwork. Then, so-called rivulets form here. If not expertly compacted, gravel nests can also form, visible later on the inside of the formwork.

Formwork Part of the aftertreatment

In the after-treatment of concrete, the shuttering has a significant importance. Often the formwork is the only aftertreatment that the installer provides:

  • the formwork protects against heat or cold
  • it can not evaporate water, the concrete only needs to be covered from above

The disguising of exposed concrete

Much knowledge is required especially when the concrete to be installed is a later exposed concrete component. If you turn it on with the wrong material, it can affect the entire surface of the exposed concrete. For example, no new formwork may be used for exposed concrete. These should have been used several times already. Otherwise it will affect the quality of the concrete surface.

Preparing the formwork inside

If the inside of the formwork is coated with cement milk, this can be counteracted. But damage must be avoided as well, otherwise these damages are transferred to the exposed concrete surface. Depending on the composition of the concrete, the formwork must then also be treated with a concrete release agent. Especially if surface structures are to be imaged.

Tips & Tricks

Even stripping the concrete can not be done arbitrarily. It is especially relevant here how long the concrete hardens.

Video Board: Beginners Learn to repair One concrete step in 5 min 4k video | Concrete and Cement Work