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In situ test method to assess the fire resistance of steel profiles with aged intumescent coating
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DOI：10.1016/j.firesaf.2026.104908.png)
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Abstract
En 中文
Intumescent coatings enhance the fire resistance of steel structures by forming a thermal protective char when exposed to fire. Thereby, significantly slowing the rise in steel temperature. However, environmental conditions can cause ageing of the intumescent coating, potentially reducing its thermal protection performance. Therefore, the durability of intumescent coatings is checked as part of the European assessment and the approval procedure. The assessment primarily relies on accelerated artificial ageing tests followed by fire testing. The corresponding test and assessment programme is designed to ensure a working life of at least 10 years. If the working life has expired or there are concerns about the coating's performance, a coated steel member from the existing structure can be extracted and tested in a fire laboratory. However, this approach is rarely used in practice due to its destructive nature and high cost. Since a visual inspection is not sufficient to determine the effectiveness of the intumescent coating in case of fire, there is a practical need for a minimally invasive, in situ test method.
Keywords:
In situ testing
Steel
Intumescent coating
Fire resistance
Thermal protection
Durability
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