TY  - JOUR
A1  - Fürst, Richard
A1  - Häßler, Dustin
A1  - Stelzner, Ludwig
A1  - Hothan, Sascha
T1  - Fire resistance of existing steel structures with aged intumescent coating based on an in situ test method
JF  - Fire Safety Journal
N2  - Intumescent coatings are commonly used in civil engineering to increase the fire resistance of steel structures. Exposed to fire, the intumescent coating reacts and forms a thermal protective char around the steel member. Thus, the heating of the steel is significantly slowed down and the fire resistance can be improved. Information regarding the scope of application and the durability of intumescent coatings are given in national approvals or European Technical Assessment documents. Due to the environmental conditions, intumescent coatings are subjected to ageing effects, which can reduce the durability and their thermal protection performance. To predict the durability for several years, during the approval procedure the behaviour of intumescent coatings is predominantly extrapolated based on accelerated artificial ageing. The established German and European assessment procedures to test and assess durability assume a working life of at least 10 years. Additional evidence may be required for longer periods. However, at present there is no method of verifying the thermal performance of existing structural members on site. For this reason, BAM is conducting the research project "INSIST" [1] to develop a minimally invasive in situ test method to determine the fire resistance of existing steel structures with applied intumescent coating. The investigation includes the development of a mobile prototype furnace. The paper describes the test setup, the developed prototype furnace, and the results of the performed test programme on uncoated and coated steel specimens. Based on this, recommendations for the test procedure are given.
KW  - In situ testing
KW  - Fire resistance
KW  - Intumescent coating
KW  - Steel
KW  - Thermal protection
KW  - Durability
PY  - 2025
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:b43-629533
DO  - https://doi.org/10.1016/j.firesaf.2025.104380
VL  - 153
SP  - 1
EP  - 12
PB  - Elsevier Ltd.
AN  - OPUS4-62953
LA  - eng
AD  - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER  -