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

Materials

Konstantinos Sakkas²  Alexandros Sofianos²  Pavlos Nomikos²  Dimitrios Panias¹ 

[1] Laboratory of Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechneiou St, Zografou, Athens 15780, Greece; E-Mail:;Laboratory of Tunnelling, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Iroon Polytechneiou St, Zografou, Athens 15780, Greece; E-Mails:

关键词: passive fire protection;    tunnel linings;    geopolymer;    successive fires;   

DOI  :  10.3390/ma8095294

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.