Investigation on the Combustion Process and Flame Retardant Performance of Asphalt with Metal Hydroxides

Wu, Bin; Huang, Zhi Yi; Zhu, Kai

doi:10.4028/www.scientific.net/amr.1065-1069.749

Cited by 4 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the same time, the high volatile content of pine sawdust can reduce the burnout temperature of the maltol byproduct and improve its burnout characteristics. 25 − 27 …”

Section: Thermogravimetric Results Analysis and Discussionmentioning

confidence: 99%

Research on Combustion Properties and Pollutant Emission Characteristics of Blends of Maltol Byproduct/Pine Sawdust

et al. 2021

View full text Add to dashboard Cite

In this paper, the combustion and pollutant emission characteristics of maltol byproduct, pine sawdust, and their blends were experimentally studied by thermogravimetry, tube furnace experiment, and scanning electron microscopy. The results show that the combustion process of maltol byproduct, pine sawdust, and their blends can be divided into three stages, in which the volatile release of the maltol byproduct includes two stages. The ignition temperature of the blended fuel is lower than that of sawdust. The NO x produced by combustion of the blended fuel is lower than that produced by sawdust combustion alone, and the SO 2 emission is always at a low level. There is a certain synergy between maltol byproduct and pine sawdust mixed combustion. Comprehensively comparing the combustion characteristics and emission characteristics, the blended fuel made by adding less than 10% maltol byproduct into pine sawdust can improve the combustion characteristics and reduce emissions, and 10% is the best proportion of the blended fuel.

show abstract

“…At the same time, the high volatile content of pine sawdust can reduce the burnout temperature of the maltol byproduct and improve its burnout characteristics. 25 − 27 …”

Section: Thermogravimetric Results Analysis and Discussionmentioning

confidence: 99%

Research on Combustion Properties and Pollutant Emission Characteristics of Blends of Maltol Byproduct/Pine Sawdust

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Based on the laboratory’s preliminary test foundation and reference to related research results [ 8 , 9 , 45 ], the value ranges of ADP and ATH are limited to 3~5 wt%. Within this range, the flame retardant can absorb the light components in the asphalt to increase the stability of the asphalt and improve the high temperature performance.…”

Section: Methodsmentioning

confidence: 99%

“…However, its use is restricted due to environmental issues such as toxic gases generated when flame retardants decompose. Inorganic flame retardants, mainly metal hydroxide flame retardants [ 8 , 9 , 10 ], have good flame retardant and smoke suppression properties. However, single flame retardants to improve the flame retardant and smoke suppression performance of asphalt have the disadvantages of large dosage and deterioration of road performance [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Multi-Objective Optimization and Performance Characterization of Asphalt Modified by Nanocomposite Flame-Retardant Based on Response Surface Methodology

et al. 2021

Materials

View full text Add to dashboard Cite

In order to improve the safety of the tunnel asphalt pavement in the event of a fire, and reduce the deterioration of the low temperature crack resistance of the asphalt by the flame retardant. The research uses aluminum hydroxide (ATH) as a smoke suppressant, diethyl aluminum hypophosphite (ADP) as a flame retardant, and halloysite nanotubes (HNTs) as a synergist to modified styrene-butadiene-styrene block copolymer (SBS) modified asphalt (MA). First, the content of ATH, ADP, and HNTs was used as the response variable. The physical properties (Penetration, Softening point, Ductility) and static flame retardant properties (Limiting oxygen index meter, Ignition point) of the asphalt modified by nanocomposite flame-retardant (HNTs-CFRMA) were the response variables. The response surface methodology was used to design the test, and regression models were established to analyze the influence of flame retardants on the performance of asphalt. Then, comprehensively considering the effects of physical properties and flame retardant properties, the normalized desirability function was used to perform a multi-objective optimization design on the components of the nanocomposite flame retardant modifier to obtain the best flame retardant formula. Finally, the rheological properties of MA, conventional flame-retardant modified asphalt (CFRMA), and HNTs-CFRMA were tested based on Dynamic shear rheometer, Multiple stress creep test, Force ductility tester, and Bending beam rheometer. The performance of flame-retardant and smoke suppression were tested by the Cone calorimeter tests. The result shows that ATH, ADP, and HNTs can enhance the high temperature performance of asphalt, reduce the penetration. The addition of HNTs can increase significantly the softening point and reduce the deteriorating effect of flame retardants on the low temperature performance of asphalt; the addition of ATH and HNTs can improve significantly the flame retardancy of asphalt. Based on the desirability function of power exponent, the formulation of the nanocomposite flame retardant with better physical properties and flame retardant properties is ATH: ADP: HNTs = 3:5:1, and the total content is 9 wt%. Nanocomposite flame retardants can improve obviously the high temperature rheological properties of asphalt. The rutting factor and the cracking factor of HNTs-CFRMA improve markedly, and the irrecoverable creep compliance is reduced, compared with MA and CFRMA. Nanocomposite flame retardant can make up for the deterioration of conventional flame retardants on asphalt’s low temperature performance. At the same time, it has better flame-retardant performance and smoke suppression performance.

show abstract

“…According to previous studies [ 7 , 12 ], when CFR is compounded at 8 wt %, it can meet the requirements of flame retardancy performance and good economy. The minimum dosage of ATH is 3% as the smoke suppression is not obvious with a dosage of ATH less than 3% [ 11 ].…”

Section: Methodsmentioning

confidence: 99%

“…However, asphalt, as a kind of flammable material, is easy to be decomposed under heat in tunnel fire and produces flammable gas and toxic fumes, which further promote fire spread and hinder fire rescue and escape [ 4 , 5 ]. At present, the most common approach to improve the flame retardancy of asphalt is by adding flame retardants, such as phosphorus flame retardant [ 6 , 7 ], brominated flame retardants [ 8 , 9 ], inorganic compound flame retardants [ 10 , 11 , 12 ], etc. The use of CFR alone is severely limited due to their low efficiency, chemical waste, and adverse effect on pavement performance [ 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the Flame Retardancy Properties and Mechanism of Modified Asphalt with Halloysite Nanotubes and Conventional Flame Retardant

Tan

et al. 2020

Materials

View full text Add to dashboard Cite

The inflammability of asphalt road will promote fire spread in the tunnel and produce lots of toxic smoke. To improve the fire resistance of asphalt pavement, mineral powder flame retardants are generally replaced by flame retardants in equal amounts. In this study, the effects of the synergistic flame retardancy system of halloysite nanotubes (HNTs) and conventional flame retardants (CFR) on the flame retardancy performance and mechanism of asphalt were investigated. Firstly, the flame retardancy properties of the HNTs and CFR composite modified asphalt were investigated based on the Cleveland open cup method (COC), Limiting oxygen index meter (LOI), and Cone calorimeter tests (CCTs). Then, the flame retardancy mechanism of the modified asphalt was studied based on Thermogravimetric analyzer (TGA), Fourier-transform infrared (FTIR), and Scanning electron microscopy (SEM). The results show that adding HNTs could improve the flame retardancy of the CFR modified asphalt binder. When 1 wt % HNTs and 8 wt % CFR were used, the limiting oxygen index of asphalt increased by 40.1%, the ignition temperature increased by 40 °C, while the heat release rate, total heat release, the smoke production rate, total smoke release, and other parameters decreased with varying degrees. Based on TG, FTIR, and SEM, the targeted flame retardancy mechanism and synergistic effect of HNTs/CFR flame retardancy system were revealed and summarized as three stages: (1) Stage 1, aluminum hydroxide (ATH) absorbs heat through thermal decomposition and inhibits the decomposition of lightweight components in asphalt; (2) Stage 2, aluminum diethyl phosphate (ADP) decomposes and produces organic phosphoric acid, which catalyzes crosslinking and ring thickening of asphalt and the quenching effect of phosphorus free radicals to block the combustion; and (3) Stage 3, HNTs plays an important role in increasing the integrity and density of the barrier layer. In addition, the Al2O3 produced by the decomposition of ATH, the carbon layer formed by the ADP catalyzed pitch, and HNTs play a significant synergistic effect in the formation of the barrier layer. Thus, the combination of HNTs and CFR has been proved to be a prospective flame retardancy system for asphalt.

show abstract

Investigation on the Combustion Process and Flame Retardant Performance of Asphalt with Metal Hydroxides

Cited by 4 publications

References 3 publications

Research on Combustion Properties and Pollutant Emission Characteristics of Blends of Maltol Byproduct/Pine Sawdust

Research on Combustion Properties and Pollutant Emission Characteristics of Blends of Maltol Byproduct/Pine Sawdust

Multi-Objective Optimization and Performance Characterization of Asphalt Modified by Nanocomposite Flame-Retardant Based on Response Surface Methodology

Research on the Flame Retardancy Properties and Mechanism of Modified Asphalt with Halloysite Nanotubes and Conventional Flame Retardant

Contact Info

Product

Resources

About