考虑隧道阻燃的纳米黏土/ATH复合改性沥青优化设计

doi:10.11896/cldb.20090343

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Abstract To improve the flame retardant performance of tunnel asphalt pavement, different types of nano clay, bentonite (OMMT) and layered double metal hydroxide (LDH), and aluminum hydroxide (ATH) were selected to prepare composite modified asphalt. The performance of different composite modified asphalt was characterized by three-index tests and limit oxygen index (LOI) test. On this basis, the optimal ratio of composites in modified asphalt was optimized by multi-index analysis. Additionally, the pyrolysis characteristics of the optimized composite modified asphalt were investigated by thermogravimetric (TG). The results show that the penetration and ductility of the modified asphalt are reduced, while the softening point is increased, with the addition of nano-clay/ATH composites. The influence of ATH/OMMT composite on the three indexes of asphalt material is more obvious than that of ATH/LDH composite. Compared with ATH modified asphalt, the LOI value of ATH/NC modified asphalt is significantly increased, and the synergistic effect of ATH/OMMT modified asphalt is obviously better than that of ATH/LDH modified asphalt. What's more, ATH and OMMT show good synergistic flame retardancy. A particle size of modifier has slight effect on the performance of asphalt. Based on the comprehensive index analysis method, OMMT and ATH are selected to prepare nano composite modified asphalt, with the content of ATH 10%, OMMT 1% and 3%. The results of TG test show that the char residual of the composite modified asphalt is significantly higher than that of the control, and the char residual of the composite modified asphalt has a good correlation with its flame retardant performance.

Key words： tunnel pavement flame retardant asphalt nano clay aluminum hydroxide (ATH) synergistic flame retardant

Published: 10 November 2022 Online: 2022-11-03

CLC number:

U414

Fund:Innovation Project of Guangxi Graduate Education (YCSW2022074), the Science and Technology Plan Project of Guangxi (Guike AD21238001), and the Natural Science Foundation of Guangxi Province (2022GXNSFBA035587).

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	Articles by authors
	YANG Xiaolong
	SHEN Aiqin
	LIU Guiyong
	JIANG Yixin
	WU Hansong

Cite this article:

YANG Xiaolong,SHEN Aiqin,LIU Guiyong, et al. Optimum Design of Nano-clay/ATH Composite Modified Asphalt Considering Tunnel Flame Retardant Properties[J]. Materials Reports, 2022, 36(21): 20090343-8.

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http://www.mater-rep.com/EN/10.11896/cldb.20090343 OR http://www.mater-rep.com/EN/Y2022/V36/I21/20090343

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