| 摘要: |
| 利用硼酸锌(ZB)与自制的沥青阻燃剂(BFR Si)对道路沥青进行复合改性来制备隧道阻燃沥青.通过锥形量热法、热重分析法和烟密度法等测试方法系统研究了ZB与BFR Si协同阻燃道路沥青的燃烧性能，探究了二者的阻燃增效作用和阻燃机理.结果表明：添加适量ZB可使道路沥青+BFR Si体系的烟密度（Ds）、热释放速率（HRR）、质量损失速率（MLR）以及有效燃烧热（EHC）等指标显著下降，点燃时间显著延长，实际成炭量增加；ZB对道路沥青+BFR Si体系具有较显著的阻燃增效作用；道路沥青+BFR Si体系呈现吸热阻燃机理和凝聚相阻燃机理的特征，道路沥青+BFR Si+ZB体系主要呈现凝聚相阻燃机理的特征. |
| 关键词: 硼酸锌 隧道路面 阻燃沥青 阻燃增效 阻燃机理 |
| DOI：103969/j.issn.1007 9629201704024 |
| 分类号: |
| 基金项目: |
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| Synergistic Effect of Zinc Borate on Tunnel Flame Retardant Asphalt and Its Mechanism |
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CHEN Huiqiang, ZHENG Zhineng, GUO Peng, WANG Weina
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School of Civil Engineering, Chongqing Jiaotong Univesity, Chongqing 400074, China
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| Abstract: |
| Tunnel flame retardant asphalt was prepared by zinc borate（ZB） and self made flame retardant(BFR Si), and its combustion performances were systematically investigated through cone calorimetry, thermal gravimetric analysis and smoke density analysis methods. The synergistic effect of BFR Si and ZB was discussed. The results indicate that ZB and BFR Si have synergistic effect which made the smoke density(Ds), the heat release rate(HRR), mass loss rate(MLR) and the effective heat of combustion(EHC) indicators of road asphalt+BFR Si system decrease, while the ignition time become longer and the practical carbon content increases, that is to say the flame resistance performance of the flame retardant asphalt is significantly improved. Road asphalt+BFR Si system shows endothermic flame retardant mechanism and condensed phase flame retardant character, while road asphalt+BFR Si+ZB system shows the condensed phase flame retardant mechanism mainly. |
| Key words: zinc borate（ZB） tunnel pavement flame retardant asphalt synergistic effect flame retardant mechanism |
