Improved fire resistance of boron nitride/epoxy intumescent coating upon minor addition of nano-alumina

2020 ◽  
Vol 256 ◽  
pp. 123634
Author(s):  
Faiz Ahmad ◽  
Eza Syahera B. Zulkurnain ◽  
Sami Ullah ◽  
Abdullah G. Al-Sehemi ◽  
Muhammad Rafi Raza
Keyword(s):  
Boron Nitride ◽  
Fire Resistance ◽  
Intumescent Coating ◽  
Minor Addition ◽  
Nano Alumina

Constant effective thermal conductivity of intumescent coatings: Analysis of experimental results

2017 ◽  
Vol 35 (2) ◽  
pp. 132-155 ◽  
Author(s):  
GQ Li ◽  
Jun Han ◽  
Yong C Wang
Keyword(s):  
Thermal Conductivity ◽  
Effective Thermal Conductivity ◽  
Fire Resistance ◽  
Coating Thickness ◽  
Fundamental Property ◽  
Simple Method ◽  
Intumescent Coating ◽  
Intumescent Coatings ◽  
Steel Section ◽  
Fire Conditions

This article presents the results of an investigation to obtain the constant effective thermal conductivities of intumescent coatings under the influence of different intumescent coating factors (type of intumescent coating, coating thickness, steel section factor, fire condition), based on the analysis of an extensive collection of fire test data. The constant effective thermal conductivity is not a fundamental property of the intumescent coating, but is a desired quantity for simplified practical fire resistance design. It is defined as the temperature-averaged value of the temperature-dependent effective thermal conductivity within the temperature range of interest for fire resistance design of steel structures. The results indicate that for each of the intumescent coating types examined, a consistent constant effective thermal conductivity exists. The constant effective thermal conductivity tends to increase with decreasing steel section factor and to decrease with increasing coating thickness. For intumescent coating–protected steel I-sections, incorporating the shadow effect gives more consistent values of constant thermal conductivity compared to those without accounting for the effect. The same constant effective thermal conductivity obtained from the ISO fire tests may be used for different fire conditions as long as the steel temperature is higher than 400 °C. The results of this research make it possible to develop a simple method to calculate temperatures of intumescent coating–protected steel sections under different fire conditions.

scholarly journals Feature of fire resistance calculation of steel structures with intumescent coating

2018 ◽  
Vol 230 ◽  
pp. 02036 ◽  
Author(s):  
Alexey Vasilchenko ◽  
Yuriy Otrosh ◽  
Nikolay Adamenko ◽  
Evgeny Doronin ◽  
Andrey Kovalov
Keyword(s):  
Fire Resistance ◽  
Steel Structure ◽  
Steel Structures ◽  
Metal Structure ◽  
Heating Time ◽  
Steel Frame ◽  
Frame Structures ◽  
Intumescent Coating ◽  
Intumescent Coatings ◽  
Steel Frame Structures

The problem of estimation of fire resistance of steel frame structures with intumescent coatings is considered. It implies that both physical properties of a covering (its thickness and structure) and mechanical properties of a metal structure change critically at heating. All above changes should be considered to maintain the standard values of fire resistance of a construction at calculation. Usually, known technical characteristics of fire resistance of intumescent coverings are used for estimation of fire resistance of steel structures with intumescent coverings. Importance of taking into account the influence of strength loss time at heating of a steel structure on calculation of fire resistance limit of system “intumescent fireproof coating steel structure” is shown in the article. On an example of calculation of heating time to the critical temperature of steel columns and beams protected by intumescent coating, it is shown that own heating time of steel structures before they lose strength makes 10 to 16 % from a settlement limit of fire resistance. This fact should be considered at the forecast of fire resistance of steel frame structures with intumescent coatings.

Research of Fireproof Capability of Coating for Metal Constructions Using Calculation-Experimental Method

2020 ◽  
Vol 1006 ◽  
pp. 3-10
Author(s):  
Andrii Kovalov ◽  
Vitalii Slovinskyi ◽  
Mykola Udianskyi ◽  
Ivan Ponomarenko ◽  
Marcin Anszczak
Keyword(s):  
Heat Conduction ◽  
Fire Resistance ◽  
Computer Modelling ◽  
Thermal Characteristics ◽  
Fire Retardant ◽  
Metal Sheet ◽  
Intumescent Coating ◽  
Metal Sheets ◽  
Firing Tests

Determination of characteristic of fireproof capability of examined fire-retardant coating by experiment-calculated method solving the inverse heat conduction problems based on the firing tests data. With the aim of determining the fire-resistance time of metal sheets with fire-retardant coating there are used experimental research methods of patterns behavior during heating according to the requirements of National Standards of Ukraine B.V. 1.1.-4-98 are used; mathematical and computer modelling of processes of unsteady heat transfer in the system “metal sheet – fire-retardant coating”; determination of thermal characteristics and characteristic of coating fireproof capability. Firing tests of metal sheets covered by the flame retardant “Amotherm Steel Wb” are carried out. Based on the obtained data (temperature from the unheated sheet surface) there are determined the thermal characteristics of formed coating depending on temperature and the characteristic of fireproof capability of examined coating for 30 minutes fire-resistance time. The effectiveness of intumescent coating “Amotherm Steel Wb” is proved and the dependence between its heat conduction coefficient and temperature during heating in experimental stove of metal sheet with this coating in standard temperature conditions is specified. The co-relation between the thickness of intumescent coating “Amotherm Steel Wb” and fire-retarding quality of metal constructions is identified. Besides the necessary minimum thicknesses of such coating from the thickness of metal sheet for importance of 30 minutes fire-resistance time are calculated.

scholarly journals EFFECT OF HEAT CAPACITY OF STEEL MEMBERS ON THE FIRE RESISTANCE OF INTUMESCENT COATING

1993 ◽  
Vol 453 (0) ◽  
pp. 189-196 ◽  
Author(s):  
Yoshifumi SAKUMOTO ◽  
Tanemi YAMAGUCHI ◽  
Tadayoshi OKADA ◽  
Masatomo YOSHIDA ◽  
Shigeki TASAKA
Keyword(s):  
Heat Capacity ◽  
Fire Resistance ◽  
Intumescent Coating ◽  
Steel Members

scholarly journals Fire Performance of Intumescent Waterborne Coatings with Encapsulated APP for Wood Constructions

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1272
Author(s):  
Atif Hussain ◽  
Véronic Landry ◽  
Pierre Blanchet ◽  
Doan-Trang Hoang ◽  
Christian Dagenais
Keyword(s):  
Heat Release ◽  
Water Absorption ◽  
Fire Resistance ◽  
Ammonium Polyphosphate ◽  
Vapor Sorption ◽  
Fire Performance ◽  
Dynamic Vapor Sorption ◽  
Intumescent Coating ◽  
Intumescent Coatings ◽  
Cone Calorimeter Test

In this work, intumescent coatings were prepared for protection of wood from fire. The fire-retardant chemical ammonium polyphosphate (APP) is known to have poor resistance to water and high humidity as it is hygroscopic in nature. To improve the water resistance, durability and fire resistance of the intumescent coating, APP was modified using a hybrid organic-inorganic polysiloxane encapsulation shell prepared by the sol–gel method. The physical and chemical properties of the intumescent mix containing microencapsulated ammonium polyphosphate (EAPP) particles were characterized by X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FTIR), water absorption, dynamic vapor sorption (DVS) and thermogravimetric analysis (TGA). The EAPP mix showed 50% reduction in water absorption, 75% reduction in water vapor sorption and increased thermal stability when compared to the APP mix. The intumescent coatings were applied on wood samples, and their fire performance was evaluated using a cone calorimeter test. The intumescent coatings containing EAPP mix showed better fire retarding properties with longer time to ignition, lower heat release rate and shorter heat release peak when compared to the coating without EAPP mix. The prepared intumescent coating shows higher resistance to water and moisture, and it has great potential to be used in bio-based construction industry for enhancing the fire resistance of wood.

scholarly journals Finite Element Modelling for Structural Performance of Slim Floors in Fire and Influence of Protection Materials

2021 ◽  
Vol 11 (23) ◽  
pp. 11291
Author(s):  
Donatella de Silva ◽  
Naveed Alam ◽  
Ali Nadjai ◽  
Emidio Nigro ◽  
Faris Ali
Keyword(s):  
Finite Element ◽  
Fire Resistance ◽  
Steel Part ◽  
Experimental Investigations ◽  
Commercial Software ◽  
Coating Materials ◽  
Intumescent Coating ◽  
Simulation Tools ◽  
Floor Systems ◽  
In Fire

Slim floor systems are very common nowadays and various types are currently being used for the construction of high-rise buildings and car parks. Concrete in slim floor beams encases the steel beam section which helps to improve their fire resistance. Despite their higher fire resistance, several fire protection materials like intumescent coatings are often used to achieve a higher fire resistance where desired. The thermal properties and behaviour of various intumescent coating materials were previously studied through experimental investigations. This paper presents finite element analyses to simulate the response of unprotected and protected slim floor beams in fire using different simulation tools. For this purpose, fire tests conducted on unprotected slim floor beams and intumescent coating materials are modelled using research and commercial software. Results from the analyses are compared and verified with the available test data. These validated models are later combined to study the behaviour of protected slim floor beams in fire. Results from the study show that the research and the commercial software replicate the behaviour of slim floor beams and protection materials with good accuracy. Due to the presence of the intumescent coating, the protected slim floor beams displayed a better fire resistance as the temperature of the steel part remained below 400 °C even after 60-min of standard heating. The protected slim floor beams continued to support the external loads even after 120 min of heating.

scholarly journals Fire Resistance and Mechanical Properties of Intumescent Coating Using Novel BioAsh for Steel

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1117
Author(s):  
Jing Han Beh ◽  
Ming Chian Yew ◽  
Lip Huat Saw ◽  
Ming Kun Yew
Keyword(s):  
Mechanical Properties ◽  
Fire Resistance ◽  
Protective Coatings ◽  
Biomass Combustion ◽  
Steel Buildings ◽  
Bunsen Burner ◽  
Adhesion Test ◽  
Intumescent Coating ◽  
Freeze Thaw ◽  
Mineral Fillers

Recent developments of intumescent fire-protective coatings used in steel buildings are important to ensure the structural integrity and safe evacuation of occupants during fire accidents. Flame-retardant intumescent coating applied to structural steel could delay the spread of fire and heat propagation across spaces and structures in minimizing fire risks. This research focuses on formulating a green intumescent coating utilized the BioAsh, a by-product derived from natural rubberwood (hardwood) biomass combustion as the natural substitute of mineral fillers in the intumescent coating. Fire resistance, chemical, physical and mechanical properties of all samples were examined via Bunsen burner, thermogravimetric analysis (TGA), carbolite furnace, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared (FTIR), freeze–thaw cycle, static immersion and Instron pull-off adhesion test. Sample BioAsh intumescent coating (BAIC) 4-7 incorporated with 3.5 wt.% BioAsh exhibited the best performances in terms of fire resistance (112.5 °C for an hour under the Bunsen burner test), thermal stability (residual weight of 29.48 wt.% at 1000 °C in TGA test), adhesion strength (1.73 MPa under Instron pull-off adhesion test), water resistance (water absorption rate of 8.72%) and freeze–thaw durability (no crack, blister and color change) as compared to other samples. These results reveal that an appropriate amount of renewable BioAsh incorporated as natural mineral fillers into the intumescent coating could lead to better fire resistance and mechanical properties for the steel structures.

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