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按照国家标准《塑料燃烧性能的测定水平法和垂直法》(GB/T 2408—2008)的有关试验方法,采用本生灯对预制夹芯保温墙体的3种板缝构造(无填充材料、填充PE棒泡沫条以及填充岩棉条)的抗火性能进行了试验研究。研究表明:无填充材料的板缝受火30min时(火焰最高温度957℃),内、外叶墙中FRP连接件的最高温度分别为132℃和97℃,超过了FRP连接件的玻璃化温度(实测玻璃化温度93℃),此时挤塑聚苯板(XPS)材料受火剧烈燃烧、熔融,这表明无填充材料的板缝构造抗火性能较差,不能满足抗火安全性要求;在受火60min情况下,火焰最高温度为970℃左右,对于填充PE棒泡沫条和岩棉条的两种板缝构造而言,其中的FRP连接件均保持完好,填充PE棒泡沫条在内、外叶墙中最高温度分别为78℃和42℃,填充岩棉条的板缝连接件在内、外叶墙中最高温度分别为47℃和36℃,此时两种板缝的XPS材料无火焰和滴落物产生,可见填充岩棉条或PE棒泡沫条的板缝构造具有较好的抗火安全性,可以在工程中推广应用。
According to the relevant test methods of the national standard “Determination of Flammability of Plastics” and the “Vertical Method” (GB / T 2408-2008), three kinds of slab structures (unfilled materials, Filled PE rod foam bar and filled rock wool) were tested. The results show that the highest temperature of the FRP connectors in the inner and outer leaf walls is 132 ℃ and 97 ℃ respectively when the slab of unfilled material is exposed to fire for 30 minutes (maximum flame temperature is 957 ℃), which exceeds the glass transition temperature of FRP connector (The measured glass transition temperature is 93 ℃). At this time, the extruded polystyrene board (XPS) material undergoes intense combustion and melting by fire, which shows that the slab structure of unfilled material has poor fire resistance and can not meet the fire safety requirements; In the case of fire 60min, the maximum flame temperature of about 970 ℃, for filling PE foam bar and rockwool two kinds of slot structure, in which the FRP connectors are intact, filled with PE foam bar , The maximum temperature in the outer wall is 78 ℃ and 42 ℃, the highest temperature of the outer wall is 47 ℃ and 36 ℃, respectively. The XPS materials No flame and dripping objects, showing filled rock wool or PE rod foam bar slab structure has good fire safety, can be popularized and applied in engineering.