Preparation of Flame Retardant Modified with Titanate for Asphalt Binder

Li, Bo; Liu, Jianxun; Han, Feng; Li, Xiaoling; Li, Liangying; Li, Yanbo; Duan, Xiaofeng

doi:10.1155/2014/510958

Cited by 9 publications

(9 citation statements)

References 20 publications

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“…The contact angle values of distilled water, glycerol, and formamide were compared with those of Evotherm M1 warm asphalt, and Sasobit warm asphalt was substituted into Equation (5). The surface energy component of the asphalt can be obtained by solving the equations, and the SFE of the asphalt is calculated according to Equations (1) and (2). The result is shown in Figure 4.…”

Section: Sfementioning

confidence: 99%

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Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

Wang

Ren

et al. 2019

Applied Sciences

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To explore the effect of ultraviolet (UV) aging on the adhesion properties of warm mix asphalt (WMA), WMA binders were prepared by adding Evotherm M1 and Sasobit into base asphalt. The base asphalt and two WMA binders were aged using a self-made UV aging box after a rolling thin-film oven test (RTFOT). As a comparison, pressure aging vessel (PAV) tests were performed for asphalt binders after RTFOT. The contact angles between the WMA binder and distilled water, glycerol, and formamide, before and after UV aging, were measured using the sessile drop method. On the basis of the surface free energy (SFE) theory, the SFE and its components, cohesion work, adhesion work, peeling work, and compatibility rate, before and after the UV aging of WMA, were obtained. The results show that the contact angle between WMA and water gradually increases with the degree of UV aging, which indicates that the aging increases the hydrophobicity of asphalt. After the RTFOT aging, UV aging at different times, and PAV aging, the SFE and its component, as well as cohesion work for all asphalt binders were reduced. The attenuation was severe after UV aging, followed by PAV aging and RTFOT aging. With the extension of UV aging time, the adhesion work, hot mix asphalt, and limestone aggregate compatibility rate gradually reduced, the peeling work increased, and the overall adhesion performance became poor. Under the aging effect of RTFOT and PAV, the Evotherm M1 WMA had the strongest anti-peeling ability, better compatibility, and the best adhesion. When the UV aging time of Sasobit WMA reached 100 h, the adhesion performance increased.

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Section: Sfementioning

confidence: 99%

“…Asphalt pavement has been widely used in the road field because of its good elasticity and plasticity, high driving comfort and strong load capacity [1,2]. At present, asphalt pavement is made of hot mix asphalt (HMA).…”

Section: Introductionmentioning

confidence: 99%

Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

Wang

Ren

et al. 2019

Applied Sciences

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“…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

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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.

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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%

“…Due to their nontoxic characteristics and their capability for smoke suppression, metal hydroxides are prevalently used to modify the flame resistance of asphalt [7][8][9][10][11][12]. Among them, hydrated lime did not initially attract the attention of researchers since it decomposes at a relatively high temperature that exceeds the ignition point of asphalt [13].…”

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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Preparation of Flame Retardant Modified with Titanate for Asphalt Binder

Cited by 9 publications

References 20 publications

Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

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

Investigation on Smoke Suppression Mechanism of Hydrated Lime in Asphalt Combustion

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