Fire Protection Of Steel Structures Research Articles

Fire Resistance Performance of Constrained H-Shaped Steel Columns with Uneven Vertical Temperature Distributions

Steel columns, which are widely used in building frameworks and spatial structures, are susceptible to capacity degradation during fires, potentially leading to the overall collapse of buildings. Existing research on the fire resistance of steel columns assumes that the temperature loads encountered by steel columns are evenly distributed vertically. However, real-world fire scenarios often feature significant vertical temperature differences. Therefore, this study comprehensively investigated these variations to derive a temperature curve that accurately represents real fire conditions. Subsequently, the fire resistance limits of steel columns were studied using this temperature curve, leading to a revised calculation formula for the critical fire resistance temperatures of steel columns. The following conclusions were drawn: (1) Nonuniform longitudinal temperature distributions are influenced by parameters such as the fire source distance, the heights of ventilation openings, and the distance between a vent and the temperature measurement point. Among them, the fire source distance has the greatest impact, with the maximum longitudinal temperature difference reaching over 500 °C. (2) Variations in the load ratio and longitudinal temperature differences alter the failure positions of steel columns, reducing their critical temperatures by up to 200 °C. (3) The revised critical fire resistance temperature formula is more accurate and safer compared with that outlined in the “Technical Code for Fire Protection of Steel Structures” (GB51249-2017). These findings offer valuable insights for the fire designs of steel columns.

Fire Protection of Steel Structures of Oil and Gas Facilities: Multilayer, Removable, Non-Combustible Covers

Fire protection is required to protect metal structures of oil and gas facilities from fires. Such fire protection should provide high fire resistance limits: 60, 90, 120 and more minutes. Specialists of LLC “RPC PROMIZOL ” developed a multilayer, removable type of fire protection made of superfine basalt fibre and ceramic materials for operation in Arctic conditions. Five experimental studies were carried out in standard and hydrocarbon fire regimes. The fire protection effectiveness of the products for I20 beams without load was obtained: a 50 mm thick coating provided 130 min of a standard fire regime; a 15 mm thick coating provided 60 min. The 15 mm thick coating provided 30 min of a hydrocarbon fire regime and the 50 mm thick coating provided 93 min of a hydrocarbon fire regime. The I40 beam under a load of 19.9 tf showed an R243 for the standard fire regime. The coefficients of effective thermal conductivity and specific heat capacity of fire-retardant compositions were determined by solving the inverse heat conduction problem. The problem was solved by modelling using the QuickField 7.0 software package, which implements FEM. Modelling showed that for obtaining the fire resistance limit R120 under the standard fire regime for the sample steel structure from an I40 beam, it is enough to apply fire protection with a thickness of 25 mm instead of 50 mm, which agrees with the experimental data. For the hydrocarbon regime, it is predicted that R120 can be obtained at a thickness of 45 mm instead of 50 mm.

ДОСЛІДЖЕННЯ ВОГНЕСТІЙКОСТІ ПОКРИТТЯ РЕАКТИВНОГО ТИПУ В УМОВАХ ВУГЛЕВОДНЕВОЇ ПОЖЕЖІ

The purpose of the study is to compare the efficiency of reactive fire protection coatings in modelling scenarios of standard and hydrocarbon fires. Methodology. Fire tests were carried out in a small-scale furnace, as regulated by DSTU EN 16623:2015. The linear coefficient of swelling K was determined in accordance with DSTU-N P B V.1.1-29:2010, and the strength of the char layer was measured using a ST-2 structurometer. The chemical structure of the thermolysis products of the fireproof coatings was studied by IR spectroscopy. Results. The study proposes an experimental protocol for assessing the strength of swollen coatings on steel plates under the influence of a standard and hydrocarbon fire. The evaluation method is based on monitoring the physical integrity and mechanical stability of the char-insulating layer formed from the reactive coating under high temperatures. It has been found that the reactive-type coating under the influence of a standard and hydrocarbon fire forms heat-protective char layers, the degree of swelling, mechanical strength and adhesion of which to the metal plate are proportional and differ on average by up to 10 %. It has been concluded that the studied coating Ammokote MW-120 can be used for fire protection of steel structures operated under potential conditions of hydrocarbon fire. Scientific novelty. The study proposes a simple and reliable method for assessing the possibility of using reactive-type coatings for fire protection of metal structures intended for use and certified for standard fire conditions in hydrocarbon fires. Pactical significance is to expand the scope of application of Ammokote MW-120 coating for fire protection of steel structures under the influence of standard and hydrocarbon fires. Keywords: fire protection of steel structures, hydrocarbon fire, intumescent coating, swelling coefficient.

Fire protection of steel structures

Fire protection of steel structures

Assessment of compatibility of metal fire-proof compositions with primer coatings to maximize effectiveness of flame retardants

Introduction. The present paper considers the issues of work planning for fire protection of steel structures, including the correct selection of primer coating in order to avoid potential problems, to save time and budget, as well as to ensure long-term durability of the structures due to the applied fire protection coating. The compatibility of materials appears to be essential when creating projects and coating technology to maximize the effectiveness of fire-proof materials.Aim. To establish the relevant requirements for the scope and sequence of work in assessing the compatibility of fire-proof compositions with the applied primer of steel structures.Materials and methods. The compatibility of flame retardants with primers was assessed using certified and verified laboratory equipment. The paper describes a modern laboratory facility for testing.Results. The results of testing compatibility of flame retardants with primers are presented. The coating system should be evaluated for the defects, its criticality in the subsequent operation, the degree of coating interlayer adhesion, and the ability of the coating to resist adverse environmental effects. Following the obtained information, recommendations are given on the compatibility of certain coating materials.Conclusion. The study demonstrated the significance of material compatibility when creating projects and coating application technology to ensure maximum effectiveness of flame retardants and to tackle the crucial task — providing long-term fire resistance of structures.

Application of hybrid cement in passive fire protection of steel structures

PurposeThe 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/approachAlkali-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.FindingsThe 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/valueEco-friendly fire protection based on hybrid alkali-activated cement of steel members.

Waste glass recycling in magnesium phosphate coatings for the fire protection of steel structures

The paper focus on the valorization of soda lime silica waste glass powder in the manufacture of fire protective coatings, for steel structures, based on magnesium phosphate cements (MPCs); waste glass powder is used to substitute part of dead burned magnesia (one of the main components of MPC) or to obtain lightweight aggregate (Gt) by alkali activation with NaOH solution followed by thermal treatment at 900 °C for 1 h. Commercially available expanded perlite is also used in MPCs to replace dead-burned magnesia or as lightweight aggregate. The MPCs mineralogical composition (assessed by XRD), microstructure and adhesion to steel plate (assessed by SEM) as well as the changes which occurs during the thermal treatment (assessed by DTA-TG analyses) are used to explain the fire behaviour and insulation properties of these coatings. The studied MPC coatings adhered very well to the steel plate, even after two consecutive fire tests (direct contact with butane flame for 60 min) and effectively decreased the substrate temperature. The coating thickness plays an important role in decreasing the temperature of the steel substrate; for thinner coatings the rate of temperature increase, in the first 10 min, is 3–4 times higher (depending on the coating composition) as compared with thicker coatings. The presence of lightweight porous aggregates, such as expanded perlite or Gt, combined with the increase of water content of MPC coatings, contributes to the decrease of the steel plate temperature during the fire test.

Preparation and properties of hydrotalcite-foamed magnesium phosphate cement for fire protection of steel structures

Foamed magnesium phosphate cement (MPC) is prepared for the fire protection of steel structures based on the carbonate decomposition reaction of hydrotalcite in acidic MPC paste. Hydrotalcite decomposes in an acidic MPC slurry to generate CO2, and approximately 50% of the theoretical gas generation remains in the MPC slurry to form foamed MPC with an apparent density of < 650 kg/m3 and 1-d compressive strength of > 4.0 MPa. The actual gas production of hydrotalcite in the MPC slurry gradually increases as the hydrotalcite content increases and the M/P ratio decreases. The fine hydrotalcite particles refine the pores and obstruct the paths between them, resulting in closed and uniform pores. When the thickness of the foamed MPC coating on the steel plate surface is only 6.0 mm, the temperature on the steel plate back after being subjected a 60 min fire resistance test is about 400 °C, which is significantly lower than the critical temperature (538 °C) for the steel structure to remain stable after encountering fire. Foamed MPC exhibits excellent fireproofing performance owing to its high porosity, low thermal conductivity, the release of CO2 in the pores, and the dehydration of hydration products, which retards heat transfer in case of fire.

The Behavior of Passive Fire Protection Materials Used for Fire Protection of Steel Structures in Standard, Hydrocarbon, and Jet Fire Exposure

Structural steel, when exposed to fire, loses its tensile strength and ability to resist deformation. Both organic and inorganic material-based passive fire protection systems, are being traditionally used to protect steel structures in such scenarios. This study focused on comparing the performance of the same organic and inorganic coatings in standard fire, hydrocarbon fire, and jet fire conditions. Standard, hydrocarbon fire, and jet fire experiments were carried out in full-scale fire resistance furnaces as per ASTM E-119, UL 1709, and ISO 22899-1 respectively. From the results, it was observed that both organic and inorganic materials tend to underperform in jet fire scenarios, when compared with standard and hydrocarbon fire due to the impingement/turbulence effect and the thermo-mechanical effect caused by the velocity of the gas.

The partial fire protection of steel members: a comparative study

PurposeThis paper provides a summary of the issues in the passive fire protection of steel structures. Types of passive fire protection and the material properties of protection members and steel members are described. The paper deals with the possibility of partial fire protection for secondary steel beams, in cases where, due to possible membrane action, it is not necessary to apply passive protection to the entire beams.Design/methodology/approachStudies of partially fire-protected steel structures are compared, and results from studies with different input data are summarized. A fire experiment was conducted to investigate the effect of partial passive protection in a small-scale furnace. Based on the findings of the experiment, numerical models were prepared using Ansys Mechanical.FindingsThe results are summarized, and a partial fire protection length of 500 mm is recommended. Various partial fire protection lengths were compared, and the temperature development of the steel contactors was compared using a protection length of 500 mm. At the end of the paper, options for partial passive protection of steel beams are presented.Originality/valueExtended paper from ASFE2021 based on selection.

Fire Behavior and Adhesion of Magnesium Phosphate Coatings for the Protection of Steel Structures

This paper presents the main properties of magnesium phosphate cements (MPCs) to be used as coatings for passive fire protection of steel structures. The influence of various additions, i.e., waste glass powder, fly ash, a styrene–acrylic dispersion, and expandable graphite, on the fire behavior and the adhesion to steel substrates of magnesium phosphate coatings is presented in this paper. The setting time of studied cements is extended when magnesia, the main component of MPCs, is partially replaced with fly ash or/and waste glass powder. The mineralogical composition of these cements, before and after thermal treatment at 1050 °C, was assessed by X-ray diffraction and could explain the changes in compressive strength, volume, and mass recorded for the thermally treated specimens. The studied magnesium phosphate coatings have a good adherence to the steel substrate (assessed by a pull-off test) both before and after direct contact with a flame (fire test) and decrease the temperature of the steel substrate by 30% with respect to the one recorded for the uncoated steel plate.

Implementation of Elements of the Concept of Lean Construction in the Fire Protection of Steel Structures at Oil and Gas Facilities

The work is aimed at developing a procedure for applying the concept of lean construction to improve the technological process of applying fire protection coating on the steel structures of oil and gas facilities. The experience of implementing elements of the concept of lean construction in the activities of the organization of the oil and gas complex is presented. The developed procedure involves the use of elements of the concept of lean construction, such as value stream mapping, the “Spaghetti” diagram, and timekeeping elements of the technological process. For the example of an existing object of the oil and gas facility, the developed methodology for the implementation of the concept of lean construction is realized. The results of implementation showed that the output per worker increased by 33%, the process time for applying fire protection epoxy coating decreased by 35%, and the total distance of the route of workers in the process of applying the composition decreased by 19%. The practical significance of the results in this study consists of the possibility of using the developed procedure in the activities of construction organizations to improve technological processes.

Fire performance of superabsorbent polymers protecting cold-formed steel walls with high load ratios

Superabsorbent polymers (SAPs) have great potential in the fire protection of steel structures due to their high absorbency and water-holding capacity. In this paper, SAP is applied to the full-scale cold-formed steel (CFS) wall studs to investigation the fire performance of the CFS walls. An axial compression experiment of CFS wall specimen at ambient temperature and three experiments at elevated temperature were conducted. Meanwhile, considering the effect of thermal expansion load, the actual load of CFS walls may increase significantly under fire condition. Hence, the load ratio of the specimens was 0.85 in the fire experiments. The specimens use an autoclaved lightweight concrete (ALC) board and calcium-silicate (CS) board as the face and base layers of sheathings, respectively. The effect of SAP insulation material, high load ratios and thermal expansion load on the fire resistance of walls are discussed. The results indicate that SAP insulation materials can improve the structural and insulation performance of CFS walls under fire exposure. This is because the dehydration and heat absorption process of the SAP insulation material removes the heat inside the wall cavity, maintaining the maximum temperature of the wall studs below 140 °C. Hence, the fire resistance time (FRT) is extended by 41 min after using the SAP insulation material. In addition, neither a high load ratio nor SAP insulation material changes the failure mode of the wall studs. For the present specimens at ambient and elevated temperature, local buckling was identified on the whole section of stud ends. However, the SAP insulation material will change the fire-induced failure position of wall studs. Specimen W3 with SAP insulation material fails at the top of the studs. Furthermore, a thermal expansion load will significantly speed up the fire-induced structural failure of CFS walls with a high load ratio. The FRT of specimen W4 decreases by 79 min after considering the effect of thermal expansion load.

Effect of bulk density on flame resistance of rockwool in combined fire-resistant facings

Fire protection of steel structures is playing an increasingly important role nowadays. The fire protection of steel structures can be solved with intumescent paint, mortar, fire protection coating and concrete coating. Several fire tests have been performed to check these solutions. Combined structures, which consist of insulation material and fire protection panels, can be used to increase the fire resistance of steel structures. In this article, the application of combined fire protection solutions (combined use of fire protection panels and thermal insulation) was examined. In the experiments, six types of rockwool products with different densities were used as an additional insulation. As a result, the behaviour of combined insulations made with rockwool products of different densities was compared at high temperatures. Based on the laboratory measurements, a finite-element model was also created.

Fire Protection of Steel Structures with Epoxy Coatings under Cryogenic Exposure

Cases of fire with highly flammable, combustible liquids and combustible gases with high potential heat emission at oil and gas facilities are assumed to develop as a hydrocarbon fire, which is characterized by the temperature rising rapidly up to 1093 ± 56 °C within five minutes from the test start and staying within the same range throughout the test, as well as by overpressure being generated. Although various fireproof coating systems are commonly used to protect steel structures from high temperatures, a combination of fire protection and cryogenic spillage protection, i.e., protection from liquefied natural gas (LNG), is rather an international practice novelty regulated by standards ISO 20088. Thanks to their outstanding features, i.e., ability to sustain chemical and climatic impact, these epoxy-based materials are able to ensure positive fireproof performance for steel structures in the case of potential cryogenic impact. The article discusses tests on steel structures coated with epoxy fireproof compounds, specifically PREGRAD-EP, OGRAX-SKE and Chartek 2218. The test records show the time from the start of cryogenic exposure to the said sample reaching the limit state, as well as the time from the start of heat impact to the sample reaching the limit state in case of hydrocarbon fire temperature.

Structural Fire Protection of Steel Structures in Arctic Conditions

Most structures in the Arctic and Antarctic for oil and gas production are offshore stations, tankers, modules, steel supporting, and enclosing structures, which need to be protected against both cryogenic spills and fire exposure. Oil and gas industry facilities have products of high flammability and explosiveness, which in the case of ignition make it possible to develop a fire along the hydrocarbon curve, accompanied by a sharp jump in temperature and the formation of excessive pressure. This article discusses possible structural fire protection for metal structures in the Arctic region. Three different structural fireproofing materials are presented using super-thin basalt fiber (STBF) as an example. Tests of steel structures with fire protection are demonstrated, as a result of which the time from the beginning of cryogenic exposure to the limit state of samples is determined, and after the time from the beginning of thermal exposure to the limit state of samples under the hydrocarbon temperature regime is determined. An assessment of various flame retardants with values up to 120 min, which can be used in arctic climate conditions, was carried out. It was found that the most effective coatings are materials prepared on the basis of STBF.

Coatings Based on Phosphate Cements for Fire Protection of Steel Structures.

Fire events in buildings can cause losses to human life and important material damage, therefore a great deal of attention is paid nowadays to fire prevention. Buildings based on steel structures are especially affected in the event of a fire, due to the important loss of load-bearing capability when steel is heated at temperatures higher than 500 °C. Therefore, one possible method to mitigate the deleterious effect of fire is to protect steel structures from direct heating by applying protective coatings. In this paper, the ability of magnesium phosphate cement (MPC), based on dead burned magnesite and calcium magnesium phosphate cement (CMPC) coatings, to protect a steel substrate was assessed. CMPCs were obtained by mixing partially calcined dolomite with a KH2PO4 (MKP) solution, and in some cases, with a setting retarder (borax). The main mineralogical compounds assessed by X-ray diffraction and electronic microscopy (SEM-EDS) in CMPC are MgO, CaCO3, and K-struvite (KMgPO4·6H2O). The coatings based on MPC and CMPC, applied to steel plates, were tested in direct contact with a flame; the coatings of MPC and CMPC without the borax addition prevented the temperature increase of a metal substrate above 500 °C. No exfoliation of coatings (MPC and CMPC without borax addition) was noticed during the entire period of the test (45 min).

Improved fire resistance of cold-formed steel walls by using super absorbent polymers

Fire resistance is an important concern in the design of steel structures. The fire protection mechanism of traditional methods is to cover the external surface of steel members and delay fire-induced heat transfer. This paper develops an innovative solution to improve the structural fire resistance using super absorbent polymers (SAPs) with an experimental study to successfully demonstrate the effect of SAPs on cold-formed steel (CFS) walls. The SAP insulation material was filled in the cavity of CFS walls to provide thermal insulation and absorb heat. Six 1.1 m × 1.1 m CFS walls with SAP insulation materials inside were prepared and subjected to the ISO 834 time-temperature curve. During the experiments, a large amount of water vapor was observed from the SAP insulation materials, effectively removing heat and providing fire protection. The effects of various combinations of SAP insulation materials and steel studs and different configurations of CFS walls on the fire resistance are discussed. The results show that increasing the stud web depth, using autoclaved lightweight concrete (ALC) boards and SAP insulation materials can substantially improve the fire resistance of CFS walls. An optimal configuration of CFS walls with ALC boards as the face-layer sheathing and SAP insulation materials in the cavity of the rectangle hollow section studs was proposed and showed high heat consumption and low damage during fire exposure, which was supported by the maximum temperature of the steel studs being less than 150 °C after exposure to ISO 834 fire for 2 h. Finally, a possible application scenario for the SAP material was proposed for the fire protection of steel structures.

Оценка огнезащитной эффективности покрытий для стальных конструкций

Представлены результаты анализа экспериментальной и аналитической оценки огнезащитной эффективности покрытий для стальных конструкций. Обобщены данные многолетних исследований по определению зависимостей от температуры таких теплофизических характеристик, как теплопроводность и теплоемкость. Разработана структурно-методологическая схема выбора огнезащитных покрытий для стальных конструкций в целях обеспечения нормативных требований по огнестойкости. Проведены экспериментальные исследования по определению огнезащитной эффективности терморасширяющихся покрытий на эпоксидной основе при воздействии температурного режима горения углеводородов. Рассмотрен вопрос о гармонизации методики экспериментальной оценки огнезащитной эффективности средств огнезащиты для стальных конструкций с действующими европейскими нормами. Установлены критерии выбора пассивной огнезащиты, зависящие от области применения способов огнезащиты. Steel structures have high strength, relative lightness and durability, but when exposed to high temperatures in a fire, they deform, lose stability and load-bearing capacity. The collapse of load-bearing steel structures can occur in 10-15 minutes after the fire start. The actual fire resistance limit of structures can be increased by using the active and passive fire protection systems. The use of the active system for increasing the actual fire resistance limit is not provided in the regulatory documents. Passive fire protection is a complex of technical solutions including the use of non-flammable materials and bulging compounds. It is also an integral part of the building structure that ensures the required fire resistance limit. Assessment of fire resistance of building structures of residential, public, warehouse and industrial buildings is carried out taking into account the temperature regime (cellulose) of a standard fire. At oil and gas, petrochemical enterprises as well as at oil production platforms fires can occur at combustion of various hydrocarbon fuels which are characterized by a rapid temperature increase to 1100 °C. In this case, in accordance with GOST R EN 1363-2-2014, the temperature regime of hydrocarbon combustion is used to assess the fire resistance of building structures. The fire-retardant effectiveness of fire protection means for steel structures is determined by the heating time of the standard I-shaped column without applying a static load on the sample to the average “critical” temperature of the steel of 500 °C. Materials used for fire protection of steel structures must have a good thermal insulation ability, which is estimated by the coefficient of thermal conductivity. When heated to high temperatures, the thermal conductivity coefficient of fire-resistant materials varies depending on their composition and temperature. Based on the analysis of research to determine the fire-retardant effectiveness of fire protection means for steel structures there was developed a structural and methodological scheme that allows to make a choice of fire protection. Currently, as a fire protection there are widely used intumescent paints and thermo-expandable coatings. Taking into account the lack of knowledge of the influence of long-term operation and a large number of other technological factors on the fire-retardant effectiveness of coatings of steel structures covered with intumescent paints, it would be right to limit the use of such type of fire protection for load-bearing structures contributing to the overall sustainability of buildings with a required fire resistance of R 30. For fire protection of steel structures of oil and gas facilities located in the open air, in severe climatic conditions and exposed to aggressive environments there is successfully used a thermo-expandable two-component epoxy-based coating. The analysis of experimental data showed that the use of epoxy-based coatings is suitable for metal structures in the open air. In closed rooms the epoxy intumescent coating should not be used because at high temperature in a fire it ignites with toxic combustion products release.

Comparison of fire resistance of polymers in intumescent coatings for steel structures

Thermal destruction of fire-retardant intumescent coating of the composition of ammonium polyphosphate (APP)/melamine (MA)/pentaerythrite (PE)/titanium oxide (TiO 2 )/polymer, which can be applied for fire protection of steel structures, was studied. The influence of polymers of different nature – ethylene-vinyl acetate (EVA), vinyl acetate versatate (VAVV), styrene acrylates, and vinyl toluene acrylate on the processes of formation of a coke layer and fire-retardant effectiveness of appropriate coatings was determined. Chemical transformations of polymers EVA and styrene acrylate in the intumescent system of ARR/MA/PE/TiO 2 in the temperature range of 200–800 °С were studied. It was established that the processes of the thermal destruction of vinyl acetate polymer are more harmonized with chemical reactions of the components of the intumescent system than similar processes for acrylate aromatic polymers. Thermal-oxidation destruction of intumescent compositions at the temperatures of 200–800 °С was explored. It was shown that basic chemical processes with polymers of EVA and VAVV begin after 300 °С and flow in the temperature range of 350–600 °С. It was found that the noticeable degradation of the carbon-phosphorus frame of intumescent compositions with styrene acrylate polymers begins at 450 °С, which is almost by 150 °С below the temperature of degradation of the compositions containing vinyl acetate binders. The conducted fire tests demonstrate that intumescent compositions with the use of acrylate aromatic polymers are more effective at the low coating thickness in ensuring the fire resistance boundary of 30 min. In order to ensure higher values of fire resistance, it is necessary to use intumescent coatings containing vinyl acetate co-polymers as the polymer component. The study of the impact of polymers of intumescent coatings on the boundary of fire resistance of steel structures has scientific and practical significance for the development of differentiated fire protection means, oriented to the given class of fire resistance. Fire-retardant intumescent compositions examined in this study can be used as the basis for the formulations of materials for fire protection of building structures under conditions of a standard fire