Evaluation of Asphalt with Different Combinations of Fire Retardants

When a fire takes place in a tunnel, the surface of the asphalt pavement will burn and release a large amount of smoke, which is toxic to human health. Thus, in order to prevent the combustion of the asphalt pavement under fire, it is necessary to propose some methods to retard its physical and chemical reaction under the high temperature. In this study, ten different combinations of fire retardants and a control case where no fire retardant was applied were prepared for evaluation. The thermogravimetric (TG)–mass spectrometry (MS) tests were used to evaluate their effect on the fire retardance from mass and energy perspectives and the Fire Dynamics Simulator (FDS) software was used to evaluate the fire retardance from temperature and smoke distribution perspectives. In experimental analysis, the TG (thermogravimetric) and DTG (differential thermogravimetric) curves were used to analyze the mass loss rate and residual mass of the asphalt and the activation energy was calculated and analyzed as well. In addition, decay rate of mass loss rate and increasing rate of activation energy were proposed to evaluate the ease of combustion of the asphalt with and without fire retardants. The results show that in laboratory experiments, the fire retardant combination which includes 48% aluminum hydroxide, 32% magnesium hydroxide, 5% expanded graphite, and 15% encapsulated red phosphorous would lead to an improved effect of fire retardance. In numerical modeling, the temperature and smoke height distribution over time were adopted to evaluate the fire retardance effect. The temperature distribution was found to be symmetrical on both sides of the combustion point and the same combination as proposed in experimental analysis was found to have the best effect on fire retardance due to the largest decrease in temperature. Additionally, because of the highest smoke height distribution, an improved effect on smoke suppression was also found when this combination was applied.

[1]  P. Xu,et al.  Full-scale immersed tunnel fire experimental research on smoke flow patterns , 2018, Tunnelling and Underground Space Technology.

[2]  Seung-Cheol Jang,et al.  Risk assessment of main control board fire using fire dynamics simulator , 2015 .

[3]  Leni Figueiredo Mathias Leite,et al.  Kinetic parameters of different asphalt binders by thermal analysis , 2011 .

[4]  Xiuling Wang,et al.  Review of the flame retardancy on highway tunnel asphalt pavement , 2019, Construction and Building Materials.

[5]  Jan Glasa,et al.  Simulation of the course of evacuation in tunnel fire conditions by FDS + Evac , 2013 .

[6]  F. Zidani,et al.  BLEVE fireball modeling using Fire Dynamics Simulator (FDS) in an Algerian gas industry , 2018, Journal of Loss Prevention in the Process Industries.

[7]  Menglin Li,et al.  Effects of Aluminum Hydroxide and Layered Double Hydroxide on Asphalt Fire Resistance , 2018, Materials.

[8]  Mo Shanjun,et al.  Analysis of Smoke Hazard in Train Compartment Fire Accidents Base on FDS , 2013 .

[9]  Jianlong Zheng,et al.  Three-Dimensional Simulation of Aggregate and Asphalt Mixture Using Parameterized Shape and Size Gradation , 2019, Journal of Materials in Civil Engineering.

[10]  J Claine Petersen,et al.  Chemical composition of asphalt as related to asphalt durability , 1984 .

[11]  Dallas N. Little,et al.  A Straightforward Procedure to Characterize Nonlinear Viscoelastic Response of Asphalt Concrete at High Temperatures , 2018, Transportation Research Record: Journal of the Transportation Research Board.

[12]  T. Ma,et al.  Laboratory investigation of the recycled asphalt concrete with stable crumb rubber asphalt binder , 2019, Construction and Building Materials.

[13]  Paul D. Ronney,et al.  Gas-phase and catalytic combustion in heat-recirculating burners , 2004 .

[14]  Xiaoming Huang,et al.  Inhibitory action of flame retardant on the dynamic evolution of asphalt pyrolysis volatiles , 2013 .

[15]  F. Nejad,et al.  Induced heating-healing characterization of activated carbon modified asphalt concrete under microwave radiation , 2018, Construction and Building Materials.

[16]  F. Nejad,et al.  Viscoelastic-based approach to evaluate low temperature performance of asphalt binders , 2016 .

[17]  Shen-Wen Chien,et al.  Using fire dynamic simulation (FDS) to reconstruct an arson fire scene , 2008 .

[18]  Hsu-Chiang Kuan,et al.  Preparation of expandable graphite and its flame retardant properties in HDPE composites , 2017 .

[19]  Mohammad Bazzaz.  Experimental and Analytical Procedures to Characterize Mechanical Properties of Asphalt Concrete Materials for Airfield Pavement Applications , 2018 .

[20]  Wei Sun,et al.  Preparation and effectiveness of composite phase change material for performance improvement of Open Graded Friction Course , 2019, Journal of Cleaner Production.

[21]  F. Evrendilek,et al.  Combustion behaviors of spent mushroom substrate using TG-MS and TG-FTIR: Thermal conversion, kinetic, thermodynamic and emission analyses. , 2018, Bioresource technology.

[22]  H.-P. Li,et al.  Study on Properties of Flame Retardant Asphalt for Tunnel , 2010 .

[23]  M. Holtzer,et al.  Thermal decomposition of foundry resins: A determination of organic products by thermogravimetry–gas chromatography–mass spectrometry (TG–GC–MS) , 2016 .

[24]  I. Ali,et al.  Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method , 2019, Renewable Energy.

[25]  Mustafa Versan Kok,et al.  Thermogravimetric and mass spectrometric (TG-MS) analysis and kinetics of coal-biomass blends , 2017 .

[26]  Qing Li,et al.  Research on Smoke Exhaust Effect at Different Installation Height of Mechanical Exhaust Port in Ring Corridor of High-rise Building , 2016 .

[27]  L. J. Li,et al.  Determination of smoke layer interface height of medium scale tunnel fire scenarios , 2016 .

[28]  G. Doubek,et al.  On the behaviour of the temperature field around pool fires in controlled experiment and numerical modelling , 2019, Process Safety and Environmental Protection.

[29]  Jin-hua Sun,et al.  Effect of inorganic additive flame retardant on fire hazard of polyurethane exterior insulation material , 2018, Journal of Thermal Analysis and Calorimetry.

[30]  Fang Wang,et al.  Theoretical and experimental study on multi-phase model of thermal conductivity for fiber reinforced concrete , 2017 .

[31]  Patrick Van Hees,et al.  Validation of FDS for large-scale well-confined mechanically ventilated fire scenarios with emphasis on predicting ventilation system behavior , 2013 .