Lucherini, A;
Hidalgo, JP;
Torero, JL;
Maluk, C;
(2021)
Influence of heating conditions and initial thickness on the effectiveness of thin intumescent coatings.
Fire Safety Journal
, 120
, Article 103078. 10.1016/j.firesaf.2020.103078.
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Abstract
The study presented herein shows an experimental methodology aimed at analysing the effectiveness of intumescent coatings through detailed characterisation of their thermo-physical response for a range of heating conditions and applied initial dry film thickness (DFT). Steel plates coated with a commercial solvent-based thin intumescent coating were exposed to well-defined and highly-repeatable heating conditions in accordance with the H-TRIS test method. Experimental results emphasise that the swelling process and the resulting swelled thickness govern the thermo-physical response of intumescent coatings, thus their effectiveness. During swelling, the coated steel asymptotically tends to the temperature range 300–350 °C, regardless of the heating condition or DFT. Thermo-gravimetric analysis demonstrates that the coating undergoes the swelling reaction at this temperature range. Once the swelling process is completed, the steel temperature increases above 350 °C. The steel temperature acts as an indicator of the swelling process, as the reaction occurs near the steel-coating interface. The intumescent coating swells and insulates the steel substrate by displacing the already-swelled coating towards the direction of the heat source. Aiming at predicting the swelling of intumescent coatings, empirical correlations are derived: the swelling rate is governed by the heating conditions and the maximum swelled thickness is governed by the initial DFT.
| Type: | Article |
|---|---|
| Title: | Influence of heating conditions and initial thickness on the effectiveness of thin intumescent coatings |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.firesaf.2020.103078 |
| Publisher version: | https://doi.org/10.1016/j.firesaf.2020.103078 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Intumescent coatings, Steel structures, Swelling, Heating conditions, Initial thickness, Heat transfer, Fire testing, H-TRIS, Fire safety |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10102490 |
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