Study on the Performance and Mechanism of Asphalt Synergistically Modified by Halloysite Nanotubes and Conventional Flame Retardant
HE Zhaoyi1, TAN Yangwei2, LI Jiaqi2, ZHANG Quan2, WU Yifei3
1 College of Traffic and Transportation, Chongqing Jiaotong University, Chongqing 400074, China 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 3 Chongqing Construction Engineering Group, Chongqing 400014, China
Abstract: In order to study the flame retardant performance and mechanism of asphalt synergistically modified by halloysite nanotubes (HNTs) and conventional flame retardant (CFR), firstly the limiting oxygen index meter, Cleveland open cup, and cone calorimeter were used to test the flame retardant properties of SBS modified asphalt, CFR modified asphalt, and asphalt synergistically modified by HNTs and CFR respectively. Then, the thermogravimetric-differential scanning calorimeter (TGA-DSC) was used to study the mass loss and heat change during the combustion process of asphalt. Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analyzer coupled with Fourier transform infrared spectrometer (TG-FTIR) were used to study the changes of solid matter and gaseous products over time change during the combustion process of asphalt. Digital ca-mera (DC) and field emission scanning electron microscope (FESEM) were used to characterize the macro and micro morphology of the asphalt residue. The flame-retardant mechanism of asphalt synergistically modified by HNTs and CFR was explored. The research results show that the limiting oxygen index (LOI) and self-ignition temperature (SIT) of asphalt modified by 1%HNTs and 8%CFR (mass fraction, the same below) are 25.5% and 441 ℃ respectively, indicating that adding flame retardant turns the asphalt into a non-flammable substance. At the same time, the peak of heat release rate (PHRR) and the peak of smoke produce rate (PSPR) of the flame-retardant asphalt are also significantly reduced, indicating that the asphalt synergistically modified by HNTs and CFR has excellent flame retardancy and smoke suppression properties. The endothermic flame-retardant mechanism of targeted decomposition of flame retardants is discovered through thermogravimetric and thermal changes. The condensed phase flame-retardant mechanism of phosphoric acid catalyzing asphalt into charcoal is discovered through the transformation law of solid-phase substances. The gaseous phase flame retardant mechanism of phosphorus radical quenching combustion is discovered through the transformation law of gaseous products. The flame retardant mechanism of the barrier layer that the flame retardant can enhance the integrity and compactness of the residue is discovered through the characterization and analysis of the morphology of the asphalt residue. The flame retardant mechanism of asphalt synergistically modified by HNTs and CFR is revealed based on the law of full-phase material changes.
何兆益, 谭洋伟, 李家琪, 张权, 吴逸飞. 埃洛石纳米管协效阻燃改性沥青性能及机理研究[J]. 材料导报, 2022, 36(2): 20110080-8.
HE Zhaoyi, TAN Yangwei, LI Jiaqi, ZHANG Quan, WU Yifei. Study on the Performance and Mechanism of Asphalt Synergistically Modified by Halloysite Nanotubes and Conventional Flame Retardant. Materials Reports, 2022, 36(2): 20110080-8.
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2022, Vol. 36 
