An investigation on thermal performance of wollastonite and bentonite reinforced intumescent fire-retardant coating for steel structures

Ahmad, F. and Ullah, S. and Merican, N.H.B.H. and Oñate, E. and Al-Sehemi, A.G. and Yeoh, G.H. (2019) An investigation on thermal performance of wollastonite and bentonite reinforced intumescent fire-retardant coating for steel structures. Construction and Building Materials, 228 .

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This research investigates the synthesis of new formulations of intumescent coating with improved thermal performance for steel structures. The coating formulations were based on the expandable graphite reinforced with wollastonite and bentonite. Ten samples of five formulations were synthesized by varying grinding time duration between 1 and 2 min. To analyse the substrate temperature of coated steel, fire test was performed according to ASTM-E119. The char morphology was observed by Field Emission Scanning Electron (FESEM) and Transmission Electron Microscopy (TEM). FTIR and X-ray Diffraction (XRD) test is conducted to analyse the composition of the residual char. The residual char mass was perceived by Thermogravimetric analysis (TGA) of the coating. X-ray Photo Electron Spectroscopy (XPS) was utilized for binding energy and elemental composition of the char. One-hour fire protection test showed 166 °C, the lowest substrate temperature of IFRC5-2 and 40.46 residual mass was obtained by TGA analysis. XRD analysis showed that residual char has aluminum borate and borophosphate and confirmed by functional group analysis using and FTIR. FESEM and TEM illustrated that char relates to hexagonal particles of wollastonite. XPS analysis of IFRC5-2 showed the carbon and oxygen contents were 41.40 and 51.20. Pyrolysis-Gas Chromatography�Mass Spectrometry (Pyrolysis GC�MS) results showed IFRC-5 produced less concentration of the gaseous products compared to IFRC-C. The formulations developed by grinding solid ingredients for 2 min showed improved thermal performance compared with the formulation produced by grinding solid ingredients for 1 min. Longer grinding time and higher amount of filler improved the thermal properties of the intumescent coating. © 2019

Item Type:Article
Impact Factor:cited By 14
Uncontrolled Keywords:Aluminum compounds; Bentonite; Binding energy; Building materials; Coatings; Electrons; Fire protection; Fires; Fourier transform infrared spectroscopy; Gas chromatography; Grinding (machining); High resolution transmission electron microscopy; Mass spectrometry; Morphology; Photoelectron spectroscopy; Pyrolysis; Reinforcement; Scanning electron microscopy; Steel structures; Transmission electron microscopy; X ray diffraction; X ray photoelectron spectroscopy, Elemental compositions; Field emission scanning; Functional group analysis; Intumescent fire retardant coatings; Pyrolysis gas chromatography; Structural steels; Wollastonite; XPS analysis, Thermogravimetric analysis
ID Code:24825
Deposited By: Ms Sharifah Fahimah Saiyed Yeop
Deposited On:27 Aug 2021 08:26
Last Modified:27 Aug 2021 08:26

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