Journal
COMPOSITES PART B-ENGINEERING
Volume 222, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2021.109045
Keywords
Temperature; Stability; Alkali activated cement; Silica fume; Refractory cement
Funding
- European Research Council (ERC) under the European Union's H2020-the framework programmefor Research and Innovation (2014-2020) ERC Grant [670, 747]
- International Campus on Safety and Intermodality in Transportation (CISIT)
- Hauts-de-France Region
- European Community
- National Center for Scientific Research
- Conseil Regional du Nord-Pas de Calais (France)
- European Regional Development Fund (ERDF)
- Chevreul Institute [FR 2638]
- Ministere de l'Enseignement Superieur et de le Recherche, Region Hauts de France
- FEDER
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The research found that geopolymer foams have excellent thermal insulation properties, with their physico-chemical properties relatively stable before and after fire tests. The addition of silica fume can reduce heat conductivity, prolonging the time for flame burn-through.
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 degrees 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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