Application of hybrid cement in passive fire protection of steel structures
Abstract
Purpose
The aim of this paper is to determine the thermal conductivity of a protective layer of alkali-activated cement and the possibility of performing fire protection with fireclay sand and Lightweight mortar. Unprotected steel structures have generally low fire resistance and require surface protection. The design of passive protection of a steel element must consider the service life of the structure and the possible need to replace the fire protection layer. Currently, conventional passive protection options include intumescent coatings, which are subject to frequent inspection and renewal, gypsum and cement-based fire coatings and gypsum and cement board fire protection.
Design/methodology/approach
Alkali-activated cements provide an alternative to traditional Portland clinker-based materials for specific areas. This paper presents the properties of hybrid cement, its manufacturability for conventional mortars and the development of passive fire protection. Fire experiments were conducted with mortar with alkali-activated and fireclay sand and lightweight mortar with alkali-activated cement and expanded perlite. Fire experiment FE modelling.
Findings
The temperatures of the protected steel and the formation of cracks in the protective layer were investigated. Based on the experiments, the thermal conductivities of the two protective layers were determined. Conclusions are presented on the applicability of alkaline-activated cement mortars and the possibilities of applicability for the protection of steel structures. The functionality of the passive fire layer was confirmed and the strengths of the mortar used were determined. The use of alkali-activated cements was shown to be a suitable option for sustainable passive fire protection of steel structures.
Originality/value
Eco-friendly fire protection based on hybrid alkali-activated cement of steel members.
Keywords
Acknowledgements
The support of Povážská cementáreň a.s.’s grant 99KHI/2019 and CTU grant SGS22/144/OHK1/3T/11 “Safety and sustainability of timber and steel structures exposed to fire” are gratefully acknowledged. Special acknowledgment belongs to P. Martauz and his team from Povážská cementáreň a.s. who shared their knowledge of H-cement properties.
Citation
Šejna, J., Šulc, S., Šmilauer, V., Reiterman, P. and Wald, F. (2023), "Application of hybrid cement in passive fire protection of steel structures", Journal of Structural Fire Engineering, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/JSFE-01-2023-0007
Publisher
:Emerald Publishing Limited
Copyright © 2023, Emerald Publishing Limited