Sprayed Concrete with increased Fire Resistance

Sprayed Concrete with increased Fire Resistance

A sprayed concrete has increased fire resistance if it is improved with polypropylene fibers. In the event of fire, the PP fibers melt and leave pathways free for the incipient vapour diffusion, preventing destruction of the cement matrix due to the internal vapour pressure. Suitable aggregates are essential for increased fire resistance. Their suitability must be verified by preliminary tests.

·     Granulometry                         0–8 mm

·     Cement type                           CEM III / A-S

·     Cement content                               425 kg/m³

·     Polypropylene fibers                2.7kg/m³, according to type