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Open AccessArticle

Behaviour of Passive Fire Protection K-Geopolymer under Successive Severe Fire Incidents

1
Laboratory of Tunnelling, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechneiou St, Zografou, Athens 15780, Greece
2
Laboratory of Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechneiou St, Zografou, Athens 15780, Greece
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Prabir Sarker
Materials 2015, 8(9), 6096-6104; https://doi.org/10.3390/ma8095294
Received: 18 July 2015 / Revised: 10 August 2015 / Accepted: 31 August 2015 / Published: 11 September 2015
(This article belongs to the Special Issue Utilisation of By-Product Materials in Concrete)
The performance of a fire resistant coating for tunnel passive fire protection under successive severe thermal loading is 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. Its performance was assessed by subjecting a concrete slab with a five cm thick K-geopolymer coating layer into successive RijksWaterStaat (RWS) fire incidents. During the first test, the maximum measured temperature in the K-geopolymer/concrete interface was 250 °C, which is 130 °C lower than the RWS test requirement, while, during the second fire test, the maximum temperature was almost 370 °C, which is still lower than the RWS requirement proving the effectiveness of the material as a thermal barrier. In addition, the material retained its structural integrity, during and after the two tests, without showing any mechanical or thermal damages. View Full-Text
Keywords: passive fire protection; tunnel linings; geopolymer; successive fires passive fire protection; tunnel linings; geopolymer; successive fires
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MDPI and ACS Style

Sakkas, K.; Sofianos, A.; Nomikos, P.; Panias, D. Behaviour of Passive Fire Protection K-Geopolymer under Successive Severe Fire Incidents. Materials 2015, 8, 6096-6104.

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