| 摘要: |
| 通过热重分析、差示扫描量热分析和傅里叶变换红外光谱分析,表征了阻燃聚合物的发泡过程,并对其产物进行了细观层面的定性和定量分析;通过单面明火高温试验,从宏观层面揭示了应用不同形状的阻燃聚合物改性水泥基复合板材的防火隔热效果.结果表明：阻燃聚合物在高温下存在3个明显的失重过程,且发泡产物具有蜂窝状的炭化结构;在明火条件下,不同形状的阻燃聚合物通过熔融、聚合和发泡等过程,能够延长水泥基复合板材的“温升平台”,在一定程度上降低热量以热传导方式向结构内部传递的速率,且发泡产物能够溢出并覆盖结构受火面,充分发挥了隧道衬砌结构自身的防火能力. |
| 关键词: 防火性能 阻燃聚合物 水泥基材料 高温 |
| DOI：103969/j.issn.1007 9629202102015 |
| 分类号: |
| 基金项目:国家重点研发计划（2018YFB2101000）；国家自然科学基金资助项目（51578410，52078378） |
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| Fire Resistance of Flame Retardant Polymer Modified Cement Based Composite Panels |
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ZHANG Tong1, YAN Zhiguo1, YANG Zhenglong2, ZHU Hehua1
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1.State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;2.School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
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| Abstract: |
| The foaming process of flame retardant polymer was characterized by thermogravimetric analysis, differential scanning calorimetry and Fourier transform infrared spectroscopy, and the products were analyzed qualitatively and quantitatively at the micro level. Besides, one side heating tests under open fire were conducted on double layer concrete panels, illustrating the fire resistant effect of polymer composite with multiple geometries in cement based materials. The results show that the flame retardant polymer experiences three intensive weight loss stages, coupled with the formation of a honeycomb like carbonization structure. Under the open fire, different flame retardant polymers can extend the “temperature platform” of cement based composite panels through the process of melting, polymerization and foaming, and reduce the heat transfer rate to the internal structure in the way of heat conduction to a certain extent. The foaming products can overflow and cover the fire surface of the structure, giving full play to the fire resistance of tunnel lining structure. |
| Key words: fire resistance flame retardant polymer cement based material high temperature |
