A new way to improve the tunnel fire protection by using flame-retarded porous asphalt pavement containing ATH powders was introduced. Based on the miniature burning test designed and conducted, the burning time and t...A new way to improve the tunnel fire protection by using flame-retarded porous asphalt pavement containing ATH powders was introduced. Based on the miniature burning test designed and conducted, the burning time and temperature of porous asphalt （PA） and flame-retarded porous asphalt （FRPA） were studied comparing with cement concrete pavement, dense-graded lIMA and SMA. Results of burning test and pavement performance test indicate that FRPA is appropriate and suitable as the pavement material of highway tunnel.展开更多
目的通过对水性聚氨酯进行硬段改性和后扩链改性,得到兼具防腐和阻燃功能的水性聚氨酯涂层材料。方法以二异氰酸酯、聚丙二醇、二羟甲基丙酸为基本单体,磷氮协效阻燃剂(FRC-6)作为硬段扩链剂,制备合成阻燃水性聚氨酯(FPU)预聚体。采用...目的通过对水性聚氨酯进行硬段改性和后扩链改性,得到兼具防腐和阻燃功能的水性聚氨酯涂层材料。方法以二异氰酸酯、聚丙二醇、二羟甲基丙酸为基本单体,磷氮协效阻燃剂(FRC-6)作为硬段扩链剂,制备合成阻燃水性聚氨酯(FPU)预聚体。采用改进的Hummers法制备氧化石墨烯(GO),以其作为后扩链剂在水性聚氨酯水乳化阶段加入,利用GO结构中的—OH等含氧官能团与FPU中的NCO—反应,制备出高接枝率氧化石墨烯化学改性的阻燃水性聚氨酯材料(GOFPU),并对GOFPU的结构与性能进行表征。结果 GO改性后,聚氨酯乳液粒度分布向粒径增大的方向变化,平均粒径在90μm左右,且乳液黏度降低,最低至9 m Pa·s,GO对聚氨酯预聚体的接枝率最高可达89.2%。GO的含量为0.4%时,材料的耐腐蚀电位增大到76 m V,耐腐蚀性最强;GO的含量为1%时,材料的极限氧指数LOI值为30.5%,达到难燃级别。结论对比相同阻燃剂含量的聚氨酯材料,GOFPU乳液的平均粒径增大,黏度降低,阻燃性大幅提高,防腐性能显著,且无毒无害、绿色环保。展开更多
Used as flame returdant of tunnel asphalt pavement, organic bromides produce a large amount of poisons and smoke in construction and flame retardation stage. The alkaline filler was found to replace mineral filler, ...Used as flame returdant of tunnel asphalt pavement, organic bromides produce a large amount of poisons and smoke in construction and flame retardation stage. The alkaline filler was found to replace mineral filler, and the flame- retarded asphalt mixtures were produced. Experimental results show that these asphalt mixtures are smoke restrained ; the performances and construction technology of asphalt pavement are not influenced; also the alkaline filler is of low-price. So this kind of flame-retarded asphalt mixtures is suitable for tunnel patement.展开更多
基金Hi-tech Research and Development Program of China (863 Program of China) (No.2006AA11Z117)
文摘A new way to improve the tunnel fire protection by using flame-retarded porous asphalt pavement containing ATH powders was introduced. Based on the miniature burning test designed and conducted, the burning time and temperature of porous asphalt （PA） and flame-retarded porous asphalt （FRPA） were studied comparing with cement concrete pavement, dense-graded lIMA and SMA. Results of burning test and pavement performance test indicate that FRPA is appropriate and suitable as the pavement material of highway tunnel.
文摘目的通过对水性聚氨酯进行硬段改性和后扩链改性,得到兼具防腐和阻燃功能的水性聚氨酯涂层材料。方法以二异氰酸酯、聚丙二醇、二羟甲基丙酸为基本单体,磷氮协效阻燃剂(FRC-6)作为硬段扩链剂,制备合成阻燃水性聚氨酯(FPU)预聚体。采用改进的Hummers法制备氧化石墨烯(GO),以其作为后扩链剂在水性聚氨酯水乳化阶段加入,利用GO结构中的—OH等含氧官能团与FPU中的NCO—反应,制备出高接枝率氧化石墨烯化学改性的阻燃水性聚氨酯材料(GOFPU),并对GOFPU的结构与性能进行表征。结果 GO改性后,聚氨酯乳液粒度分布向粒径增大的方向变化,平均粒径在90μm左右,且乳液黏度降低,最低至9 m Pa·s,GO对聚氨酯预聚体的接枝率最高可达89.2%。GO的含量为0.4%时,材料的耐腐蚀电位增大到76 m V,耐腐蚀性最强;GO的含量为1%时,材料的极限氧指数LOI值为30.5%,达到难燃级别。结论对比相同阻燃剂含量的聚氨酯材料,GOFPU乳液的平均粒径增大,黏度降低,阻燃性大幅提高,防腐性能显著,且无毒无害、绿色环保。
文摘Used as flame returdant of tunnel asphalt pavement, organic bromides produce a large amount of poisons and smoke in construction and flame retardation stage. The alkaline filler was found to replace mineral filler, and the flame- retarded asphalt mixtures were produced. Experimental results show that these asphalt mixtures are smoke restrained ; the performances and construction technology of asphalt pavement are not influenced; also the alkaline filler is of low-price. So this kind of flame-retarded asphalt mixtures is suitable for tunnel patement.
