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Potassium based geopolymer for passive fire protection of concrete tunnels linings

Sakkas, K. / Panias, D. / Nomikos, P.P. / Sofianos, A.I.

The design of a fire resistant coating for tunnel passive fire protection and its performance under thermal loading are presented. The material falls under the class of potassium based geopolymers (K-geopolymer) and was prepared by mixing ferronickel (FeNi) slag, doped with pure alumina, with a highly alkaline potassium hydroxide aqueous phase. The physical, mechanical and thermal properties of the K-geopolymer were determined and compared to those of some commercially available fire resistant materials. Its behavior upon exposure to fire was assessed by subjecting a concrete slab, coated with a 5 cm thick K-geopolymer layer, to thermal loading under the RijksWaterStaat (RWS) temperature–time curve, which is considered as the most severe prescribed tunnel fire scenario. During the test, the geopolymer/concrete interface temperature remained under 280 °C, which is 100 °C lower than the RWS test requirement, proving the effectiveness of the material as a thermal barrier. In addition, the K-geopolymer retained its structural integrity after the test, without any significant macroscopic damage.

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Potassium based geopolymer for passive fire protection of concrete tunnels linings

Sakkas, K. / Panias, D. / Nomikos, P.P. / Sofianos, A.I.

The design of a fire resistant coating for tunnel passive fire protection and its performance under thermal loading are presented. The material falls under the class of potassium based geopolymers (K-geopolymer) and was prepared by mixing ferronickel (FeNi) slag, doped with pure alumina, with a highly alkaline potassium hydroxide aqueous phase. The physical, mechanical and thermal properties of the K-geopolymer were determined and compared to those of some commercially available fire resistant materials. Its behavior upon exposure to fire was assessed by subjecting a concrete slab, coated with a 5 cm thick K-geopolymer layer, to thermal loading under the RijksWaterStaat (RWS) temperature–time curve, which is considered as the most severe prescribed tunnel fire scenario. During the test, the geopolymer/concrete interface temperature remained under 280 °C, which is 100 °C lower than the RWS test requirement, proving the effectiveness of the material as a thermal barrier. In addition, the K-geopolymer retained its structural integrity after the test, without any significant macroscopic damage.

Potassium based geopolymer for passive fire protection of concrete tunnels linings

Sakkas, K. / Panias, D. / Nomikos, P.P. / Sofianos, A.I.

The design of a fire resistant coating for tunnel passive fire protection and its performance under thermal loading are presented. The material falls under the class of potassium based geopolymers (K-geopolymer) and was prepared by mixing ferronickel (FeNi) slag, doped with pure alumina, with a highly alkaline potassium hydroxide aqueous phase. The physical, mechanical and thermal properties of the K-geopolymer were determined and compared to those of some commercially available fire resistant materials. Its behavior upon exposure to fire was assessed by subjecting a concrete slab, coated with a 5 cm thick K-geopolymer layer, to thermal loading under the RijksWaterStaat (RWS) temperature–time curve, which is considered as the most severe prescribed tunnel fire scenario. During the test, the geopolymer/concrete interface temperature remained under 280 °C, which is 100 °C lower than the RWS test requirement, proving the effectiveness of the material as a thermal barrier. In addition, the K-geopolymer retained its structural integrity after the test, without any significant macroscopic damage.

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Title:

Potassium based geopolymer for passive fire protection of concrete tunnels linings

Contributors:

Sakkas, K. (author) / Panias, D. (author) / Nomikos, P.P. (author) / Sofianos, A.I. (author)

Published in:

Tunnelling and Underground Space Technology ; 43 ; 148-156

Publication date:

2014

Size:

9 Seiten, 31 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.tust.2014.05.003

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Tunnelausbau , Geopolymer , Brandschutz , Kalium , Ferronickel , Aluminiumoxid , Kaliumhydroxid , thermische Belastung , wässrige Phase , Wärmesperre , Beton

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