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Study of changes in the properties of fire-retardant coatings of intumescent type by thermomechanical analysis method

https://doi.org/10.22227/0869-7493.2024.33.02.32-41

Abstract

Introduction. Fire protection of metal structures is one of the urgent problems of increasing fire resistance of structures, for which purpose intumescent type materials are currently used, which have a limited service life.
At the same time, technical documentation on fire protection means has no data on the preservation of properties of the created fire protection system depending on the terms and conditions of operation. The aim of the study is to approve the method of thermomechanical analysis to assess the preservation of fire protection properties of the fire protection system during its operation.

Theoretical foundations. In modern conditions, experimental assessment of the preservation of properties of fire protection means, as a rule, is not carried out, the manufacturer is limited to conducting tests to determine the values of fire protection effectiveness of fire protection means, which contradicts the requirements of national standards. At the moment, there are no standardized test methods for the preservation of fire protection properties of fire protection means depending on the terms and conditions of operation in our country.

Methods. Optimal parameters for testing fire protection products using the thermomechanical analysis (TMA) method were determined, and changes in fire protection products subjected to climatic aging were investigated. The authors suggest using of universal parameter with accurate physical explanation — the coefficient of volumetric expansion, instead of rather subjective and inaccurate parameter — the swelling coefficient.

Results and discussions. Specimen aging process demonstrates significant changes in the coating, for example heat-protective foam layer formation, which leads to the situation when fire protection system is not effective in ensuring required fire resistance limit under operating conditions. The coefficient of volumetric expansion for the specimen with climatic aging is reduced by more than 40 % when used for six or more years.

Conclusions. The study demonstrates that heat-insulated layer of a fire-retardant coating during operation for more than three years is significantly reduced. The use of thermomechanical analysis method can serve as an additional proof for the effectiveness of fire protection product, both within the framework of construction control and real operating conditions.

About the Authors

T. Yu. Eremina
National Research Moscow State University of Civil Engineering
Russian Federation

Tatyana Yu. EREMINA, Dr. Sci. (Eng.), Professor of Integrated Safety in Civil Engineering

Yaroslavskoe shosse, 26, Moscow, 129337

RISC AuthorID: 274777, Scopus: 56893573700



S. V. Utkin
Federal Fire Service “Fire Test Laboratory” for the city of Saint Petersburg”
Russian Federation

Sergey V. UTKIN, Head of Laboratory, Forensic Expert Institution

Penkovaya St., 6, Saint Petersburg, 197046

RISC AuthorID: 1085392



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For citations:


Eremina T.Yu., Utkin S.V. Study of changes in the properties of fire-retardant coatings of intumescent type by thermomechanical analysis method. Pozharovzryvobezopasnost/Fire and Explosion Safety. 2024;33(2):32-41. (In Russ.) https://doi.org/10.22227/0869-7493.2024.33.02.32-41

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ISSN 0869-7493 (Print)
ISSN 2587-6201 (Online)