Thermal Behavior of an Intumescent Alkaline Aluminosilicate Composite Material for Fire Protection of Structural Elements

AbstractThe behavior of a composite material, consisting of metakaolin-based alkaline aluminosilicate binder, granules of the same initial composition used as a swelling agent, and calcium carbonate, was studied during firing in the temperature range 25°C–1,000°C. A combination of techniques was use...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2019-06, Vol.31 (6)
Main Authors: Sotiriadis, Konstantinos, Guzii, Sergii G, Mácová, Petra, Viani, Alberto, Dvořák, Karel, Drdácký, Miloš
Format: Article
Language:English
Subjects:
Aluminosilicates
Aluminum silicates
Building materials
Calcium carbonate
Civil engineering
Composite materials
Composition
Crystallization
Fire protection
Granular materials
Heat conductivity
Heat transfer
Metakaolin
Porosity
Protective coatings
Structural members
Swelling
Technical Papers
Thermal conductivity
Thermal insulation
Thermodynamic properties
Water loss
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Summary:AbstractThe behavior of a composite material, consisting of metakaolin-based alkaline aluminosilicate binder, granules of the same initial composition used as a swelling agent, and calcium carbonate, was studied during firing in the temperature range 25°C–1,000°C. A combination of techniques was used to investigate its microstructure, composition, and properties. The material developed porosity at 200°C, largely contributed by water loss from the swelling agent, resulting in expansion and decrease in thermal conductivity and mechanical strength. Between 400°C and 800°C the thermal insulation characteristics further improved. At 1,000°C, crystallization of new phases with a decrease in the amorphous content produced a small contraction and increased thermal conductivity and mechanical strength. The material exhibited good stability with appropriate characteristics for use as intumescent coating for fire protection of structural elements. Modification of the binder:granules ratio may allow producing composites for specific applications.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002702