Flat board for lost casing used for concrete walls comprises light cement mixture

摘要

Flat board for a lost casing comprises a light cement mixture. An independent claim is included for the production of the above flat board by forming a granulate by drying a mixture of 10 volume % polymer improver, 20 volume % cement, 60 volume % polystyrene and 10 volume % water and forming a mixture of 70 volume % granulate, 20 volume % cement and 10 volume % water.