The mechanism of flame and smoke retardancy of asphalt mortar containing composite flame retardant material

Qin, Xiantao; Zhu, Siyue; Chen, Shuanfa; Deng, Kunyao

doi:10.1016/j.conbuildmat.2012.12.048

Cited by 27 publications

(12 citation statements)

References 17 publications

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“…Asphalt concrete (AC) has been widely used for tunnel pavement nowadays due to its high driving comfort, low noise as well as the low construction cost [1]. However, the flammability of asphalt binder, an essential component of AC, becomes a tremendous obstacle to its application.…”

Section: Introductionmentioning

confidence: 99%

Effect of Various Metal Hydroxide Flame Retardants on the Rheological Properties of Asphalt Binder

Gu¹,

Zhang²,

Zhu³

et al. 2019

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Metal hydroxide has been widely used as flame retardant to reduce the hazards of tunnel fire, however, few researches investigate its effect on the rheological properties of asphalt binder systemically. This study explores and compares the effect and mechanisms of magnesium hydroxide (MH), aluminium hydroxide (ATH), hydrated lime (HL), and layer double hydroxides (LDHs) on the rutting resistance, anti-aging resistance, as well as the thermal cracking resistance of asphalt binder. Rotational viscosity (RV) test, dynamic shear rheometer (DSR) test, and bending beam rheometer (BBR) test are involved in the project. Test results indicate: (1) the addition of metal hydroxide generally improves the rutting resistance of asphalt binder during high temperatures due to the typical filler effect, while weakens the resistance to thermal cracking of binder at low temperatures because of the stress concentration; (2) HL and LDHs enhance the anti-aging resistance of asphalt binder; (3) LDHs modified binder, which is proved with better rheological properties, including great rutting resistance, anti-aging resistance and passable resistance to thermal cracking, is recommended for further use. However, the high procurement price is still a big obstacle for its wider application. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.21572

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Section: Introductionmentioning

confidence: 99%

Effect of Various Metal Hydroxide Flame Retardants on the Rheological Properties of Asphalt Binder

Gu¹,

Zhang²,

Zhu³

et al. 2019

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“…Therefore, the concentration of Sasobit It can be seen in Figures 9-11 that 1 at different temperatures, the accumulated strain values of modified asphalt binder increased with the increase of loading numbers, showing a curvilinear growth trend and viscoelastic rheological characteristics. 2 The addition of flame retardant and Sasobit can effectively reduce accumulated strain value of asphalt binder, take the cumulative strain at 40 • C in the 50th creep recovery cycle for example, Sasobit modified asphalt binder and warm-mixed flame retardant asphalt binder with different flame retardant concentration decreased by 32.24%, 38.28%, 40.33%, 45.40%, and 51.50% compared to SBS modified asphalt binder, respectively, which suggests that both Sasobit and flame retardant can significantly improve the high-temperature stability of asphalt binder; and as for warm-mixed flame retardant asphalt binder, the accumulated strain decreased gradually with the increase of the concentration of flame retardant, indicating that the increase of the concentration is beneficial to enhancing the high-temperature deformation resistance of the asphalt binder.…”

Section: Resultsmentioning

confidence: 99%

“…In It can be seen from Figures 6-8 that 1 during the 51th and 60th loading cycles, the accumulated strain value of asphalt binder tested at 50 • C is significantly greater than those tested at 40 • C and 30 • C, which shows that with the increase of the test temperature, the accumulated strain value of asphalt binder increased accordingly. 2 At three different temperatures, the accumulated strain values of Sasobit modified asphalt binder and warm-mixed flame retardant asphalt binder are significantly lower than that of SBS modified asphalt binder, which indicates that both Sasobit and flame retardant can markedly enhance the deformation recovery ability of asphalt binder.…”

Section: Repeated Creep Recovery Testmentioning

confidence: 90%

“…Furthermore, because of the narrow and closed tunnel space and poor atmospheric conditions, a great deal of heat and harmful smoke is generated in the process of paving construction, which leads to a terrible construction environment in the tunnel and severe damage to the health of on-site construction personnel. It is therefore imperative to carry out research on warm-mixed flame-retardant asphalt technology [1,2].…”

Section: Introductionmentioning

confidence: 99%

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Performance of Warm-Mixed Flame Retardant Modified Asphalt Binder

Zhang

et al. 2019

Applied Sciences

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In order to analyze the effect of flame retardant and warm mix asphalt (WMA) additives-Sasobit on the flame-retardant performance and pavement performance of asphalt binder, the limiting oxygen index test, conventional performance test, and Superpave evaluation index tests were performed on asphalt binders in the study. The test results show that flame retardant can effectively improve the flame resistance of asphalt binder, while Sasobit has a certain combustion-supporting effect. Therefore, when warm-mixed flame-retardant technology is applied, the concentration of Sasobit should be controlled appropriately. These two modifiers can significantly enhance the high-temperature performance of asphalt binder, but both of them have a slight negative influence on the low-temperature cracking resistance. Sasobit can substantially reduce the high-temperature viscosity of asphalt binder, which helps to improve the construction workability of asphalt binder, while the flame retardant adversely affects the viscosity reduction effect of Sasobit to a certain extent, but the overall impact is not large.

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“…e combustion of asphalt is typically accompanied with a quantity of toxic smoke [3,4], seriously endangering any personnel within the affected areas. To solve this problem, applying flame retardant to asphalt has become a common way to reduce the hazards associated with pavement during tunnel fires [5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

Zhu

Wang

Zhou

et al. 2018

Journal of Chemistry

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In this study, cone calorimeter and thermogravimetric analyses were used to simulate the asphalt combustion process under the conditions of fire radiation and programmed temperature increase. e gaseous compositions and release rules were analyzed by infrared spectroscopy to investigate the influence of hydrated lime on the smoke suppression mechanism in the asphalt combustion process. e experimental results show that hydrated lime can promote the asphalt mastic surface to form a barrier layer during the combustion process. is barrier layer can reduce the burning intensity of asphalt. Although the compositions of gaseous products do not change much, the rates of CO production and smoke release are decreased. In addition, hydrated lime is alkaline and can thus neutralize acidic gases such as SO 2 and reduce the toxicity of gaseous products. With the addition of 40 wt.% hydrated lime, the total smoke release and the CO release rate both decrease by more than 20% relative to the addition of the same amount of limestone fillers and decrease by more than 10% relative to the addition of the same amount of magnesium hydroxide flame retardant.

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The mechanism of flame and smoke retardancy of asphalt mortar containing composite flame retardant material

Cited by 27 publications

References 17 publications

Effect of Various Metal Hydroxide Flame Retardants on the Rheological Properties of Asphalt Binder

Effect of Various Metal Hydroxide Flame Retardants on the Rheological Properties of Asphalt Binder

Performance of Warm-Mixed Flame Retardant Modified Asphalt Binder

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

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