Effective thermal conductivity of fibrous fireproofing materials

Tugnoli, Alessandro; Moricone, Raffaela; Scarponi, Giordano Emrys; Cozzani, Valerio

doi:10.1016/j.ijthermalsci.2018.09.035

Cited by 19 publications

(18 citation statements)

References 30 publications

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“…Passive fire protection (PFP) is a measure to safeguard structures and industrial paraphernalia against fortuitous incidences of fire. The materials which are competent enough for fireproofing stay away from sudden heating of the structures and mitigate the deterioration of the mechanical attributes of the structural parts [84]. Nowadays, a trend to apply cementitious aggregates mixed with light inorganic elements possessing appropriate thermal characteristics, viz., vermiculite, are usually employed for the thermal insulation of fixed installations [85].…”

Section: Introductionmentioning

confidence: 99%

Fire Resistance Behaviour of Geopolymer Concrete: An Overview

2021

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Even though, an innovative inorganic family of geopolymer concretes are eye-catching potential building materials, it is quite essential to comprehend the fire and thermal resistance of these structural materials at a very high temperature and also when experiencing fire with a view to make certain not only the safety and security of lives and properties but also to establish them as more sustainable edifice materials for future. The experimental and field observations of degree of cracking, spalling and loss of strength within the geopolymer concretes subsequent to exposure at elevated temperature and incidences of occurrences of disastrous fires extend an indication of their resistance against such severely catastrophic conditions. The impact of heat and fire on mechanical attributes viz., mechanical-compressive strength, flexural behavior, elastic modulus; durability—thermal shrinkage; chemical stability; the impact of thermal creep on compressive strength; and microstructure properties—XRD, FTIR, NMR, SEM as well as physico-chemical modifications of geopolymer composites subsequent to their exposures at elevated temperatures is reviewed in depth. The present scientific state-of-the-art review manuscript aimed to assess the fire and thermal resistance of geopolymer concrete along with its thermo-chemistry at a towering temperature in order to introduce this novel, most modern, user and eco-benign construction materials as potentially promising, sustainable, durable, thermal and fire-resistant building materials promoting their optimal and apposite applications for construction and infrastructure industries.

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Section: Introductionmentioning

confidence: 99%

Fire Resistance Behaviour of Geopolymer Concrete: An Overview

2021

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“…Thermal energy passing through a participating medium may generally be represented by several heat transfer modes: convection, conduction and radiation through different phases (solid and gas) between fibers [11]: (1) conduction in the solid and gas phase; (2) convection and radiative transfer through the gas phase; (3) thermal radiation. It has been recognized that the solid heat conduction and gas heat conduction are coupled.…”

Section: The Effective Thermal Conductivitymentioning

confidence: 99%

Theoretical prediction and experimental characterization of radiative properties and thermal conductivities of fibrous aramid fabrics

Zhu

2021

Journal of Industrial Textiles

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Nonwoven aramid fabric is widely used as thermal barrier of fireproofing clothing due to its inherent flame retardancy and light weight. In fire or high temperature scenario, radiative heat transfer becomes the predominant heat transfer mode inside firefighters’ clothing. In this work, Fourier transform infrared spectroscopy (FTIR) was adopted to measure the spectral transmittance and spectral extinction coefficients of four aramid fabrics with different porosity in infrared wavelength range between 2.5 and 25 μm. It was found that the radiative properties of fibrous aramid fabric are strongly dependent on its bulk density or porosity. The spectral extinction coefficient decreases with increasing porosity or decreasing bulk density. The infrared optical properties combined with infrared imaging measurements demonstrate that aramid fabric may be used as infrared semi-transparent textile. A predicted model, combined the effects of conduction-radiation heat transfer, has been developed to calculate the effective thermal conductivity of aramid fiber materials. The model implemented the Rosseland diffusion approximation to evaluate radiative thermal conductivity, and the Parallel-Series structural model to evaluate tortuosity-weighted phonic thermal conductivity. The predicted results were also compared with experimental data obtained from TPS method. This work provides useful information for future studies of heat transfer mathematical modeling of firefighters’ clothing.

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“…Generally speaking, a continuum gas regime takes place when Knudsen number is less than 0.01, and gas flow belongs to free-molecular regime when Knudsen number is greater than 10. The interval 0.01<Kn<10 is described as a transition regime, where both intermolecular and molecule-fiber collision processes can occur [35]. Furthermore, The gas molecular mean free path can be calculated by ⎛…”

Section: Determinations Of Model Parametersmentioning

confidence: 99%

Investigating the effective thermal conductivity of moist fibrous fabric based on Parallel-Series model: a consideration of material’s swelling effect

Zhu

2020

Mater. Res. Express

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The aim of this work reported in the paper is to investigate the influence of moisture content on the effective thermal conductivity (ETC) of non-hygroscopic Polyethylene terephthalate (PET) and hygroscopic Viscose (VC) fabrics using Parallel-Series (P-S) thermal-electrical analogy method and TPS measurement. An equivalent porosity for hygroscopic fabric was first proposed to preserve the validity of the P-S model. The equivalent porosity is characterized by reasonably eliminating the absorbed moisture effects partly, which is embodied in enhancing heat conduction, endothermic reaction and swelling. Calculated values of the effective thermal conductivity of the two kinds of fabrics had been compared with experimental measurements. Results show that the P-S model incorporated with equivalent porosity is found to yield higher prediction accuracy than that of P-S model with parent porosity. The calibrated model can also provide a robust tool for predicting the global effective thermal conductivity of moist hygroscopic fibrous porous media. Nomenclature P-SParallel-Series ETC Effective thermal conductivity ΔP pressure difference r pore-throat radius || parallel ⊥ series T temperature

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Effective thermal conductivity of fibrous fireproofing materials

Cited by 19 publications

References 30 publications

Fire Resistance Behaviour of Geopolymer Concrete: An Overview

Fire Resistance Behaviour of Geopolymer Concrete: An Overview

Theoretical prediction and experimental characterization of radiative properties and thermal conductivities of fibrous aramid fabrics

Investigating the effective thermal conductivity of moist fibrous fabric based on Parallel-Series model: a consideration of material’s swelling effect

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