| 摘要: |
| 采用氢氧化铝、有机蒙脱土与可膨胀石墨复配阻燃抑烟剂，通过极限氧指数（LOI）法、烘箱恒温加热试验、热重分析、傅里叶变换红外光谱、扫描电镜及X射线能谱分析了复合阻燃抑烟剂对沥青的作用效果与协同机理. 结果表明：复配剂的加入起到明显的阻燃抑烟效果，含量为6%的复配剂可将沥青的LOI值提升至25.19%，单位沥青烟气释放量减少70%；复配剂拓宽了单一助燃剂的作用温度范围，在沥青燃烧过程中吸收热量，稀释可燃气体浓度，不仅能够提升沥青的热稳定性，还可形成复合阻隔层，起到协同阻燃抑烟作用. |
| 关键词: 路面材料 阻燃抑烟 协同机理 氢氧化铝 有机蒙脱土 可膨胀石墨 |
| DOI：10.3969/j.issn.1007-9629.2024.04.005 |
| 分类号:U414 |
| 基金项目:广西省重点研发计划项目（桂科AB20297033，桂科AB23026144）；国家自然科学基金资助项目（51908194）；江西省交通运输厅科技项目（2023H0001） |
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| Effect and Synergistic Mechanism of Composite Flame Retardant and Smoke Suppressant for Asphalt |
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LI Xiaochao1, LIU Shengjie1, ZENG Lihao2, WANG Haiming1, LIN Yu3
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1.School of Civil Engineering and Transportation， Hohai University， Nanjing 210098，China;2.Guangxi Key Laboratory of Road Structure and Materials， Guangxi Jiaoke Group Co.， Ltd.，Nanning 530007，China;3.Zhejiang Jiaotou Expressway Operation Management Co.， Ltd.， Hangzhou 310000，China
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| Abstract: |
| Composite flame retardant and smoke suppressant was prepared by using aluminum hydroxide， organic montmorillonite and expandable graphite. By the limiting oxygen index（LOI） method， oven constant temperature heating， thermogravimetric analysis， Fourier infrared spectroscopy， scanning electron microscopy and X-ray energy spectrum were used to analyze the effect and synergistic mechanism of composite flame retardant and smoke suppressant for asphalt. The results show that the addition of the compound agent has obvious flame retardant and smoke suppression effect， 6% of the compound agent can increase the LOI value of asphalt to 25.19%， and the unit asphalt smoke release amount is reduced by 70% . The compound agent broadens the temperature range of the single combustion promoter. It absorbs heat and dilutes the concentration of combustible gas during the combustion of asphalt. It not only improves the thermal stability of asphalt， but also forms a composite barrier layer， which plays a synergistic flame retardant and smoke suppression role. |
| Key words: pavement material flame retardant and smoke suppression synergistic mechanism aluminum hydroxide organic montmorillonite expandable graphite |
