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Flame resistance of geopolymer foam coatings for the fire protection of steel

Abstract : This research investigates the fire resistance of novel geopolymer (GP) foams, based on alkali-activated metakaolin and silica fume (SF). Fresh GP foams are applied as coatings on steel plates. After one week curing, the foams are subjected to a flame burn-through test. Changes in their physico-chemical properties are characterized before and after fire test, mainly with XRD, quantitative MAS NMR, electron probe micro-analysis, quantitative X ray micro-computed tomography and heat conductivity. Results show that GP foams are excellent thermal barriers, providing up to 251 °C less than for uncoated steel plate. Their porosity ranges between 25 and 81%, for typical pore sizes d50 from 0.5 to 3.0 mm 29Si MAS NMR shows that the proportion of GP cement only decreases from 60-68% to 53–58% after fire. SF expands and creates small pores in the coating, which is favorable to decrease heat conductivity by a factor of 2 whatever the foam.
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https://hal.univ-lille.fr/hal-03272136
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Soumis le : lundi 28 juin 2021 - 10:36:45
Dernière modification le : mercredi 20 octobre 2021 - 09:58:19

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Johan Sarazin, Catherine Davy, Serge Bourbigot, Grégory Tricot, Jérôme Hosdez, et al.. Flame resistance of geopolymer foam coatings for the fire protection of steel. Composites Part B: Engineering, Elsevier, 2021, Composites Part B: Engineering, 222, pp.109045. ⟨10.1016/j.compositesb.2021.109045⟩. ⟨hal-03272136⟩

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