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Materials 2015, 8(9), 6096-6104; doi:10.3390/ma8095294

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
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Prabir Sarker
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)
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Abstract

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
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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