Fire protection for re-plate
re-plate reaction to fire
re-plate has a similar reaction to fire to that of conventional steel, losing strength significantly from about 400°C, and reducing its prestressing to zero at about 350°C. The same applies to the anchorage with Hilti direct fastenings; separate behaviour in fire tests are available for these.
Fire protection of the strengthening measures is always required if the specific fire load for the relevant standard and country is not covered without the strengthening.
Fire protection
The concrete substrate and strengthening plates are cleaned and fully covered with the base coat SikaCem® Pyrocoat Base. A fine layer of SikaCem® Pyrocoat sprayed ortar is then applied over the full strengthening system. This mortar also levels any uneven areas. An E-glass mesh fabric (alkali-resistant) is fully embedded into the mortar over the re-plate. To prevent voids due to re-plate movement, the sprayed mortar is applied laterally into these gaps.
The fire protection system was tested at MFPA Leipzig, Germany. The test reports are available in the download section on the website or on demand.
Additional fire tested mortars in the Sika MonoTop® range are available for outdoor applications and in tunnelling. The fire protection measures and stated layer thicknesses are guide values and must also conform and be compatible with all relevant local regulations and standards.
