use of gypsum, anhydrite and accelerator free cement spritzzement

摘要

Gypsum- and anhydrite-free cement, preferably Portland cement, iron Portland cement or blast-furnace cement, can be used as sprayed cement or, as a blend with aggregates, in dry-sprayed concrete. For this use, the cement should have a specific surface area of 2000 to 8000 cm2/g and can contain up to 30% by mass of amorphous silica. In conjunction with the use according to the invention, 0.1 to 5% by mass (relative to the weight of the cement) of plasticiser can be used as an agent to save water.