Kvarsittande bjälklagsform och sätt att tillverka ett samverkansbjälklag, varvid betongen torkar ut nedåt

摘要

The bottom flanges are perforated and covered with a porous material such as felt or a mineral wool panel. The porous material absorbs moisture from the cast concrete and directs it towards the slab perforations, from where it is released into the atmosphere.