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通过模拟火灾现场材料表面实际升温曲线,分析了不同纤维混凝土的临界含湿量以及不同含湿量下混凝土的质量损失,同时采用大板混凝土进行火灾试验。研究发现:含湿量的高低较大程度上影响着试件受火后表面爆裂程度、裂缝数量、渗水时间以及质量损失;防火纤维混凝土爆裂的临界含湿量高于其他3种混凝土(普通混凝土、聚乙烯纤维混凝土、聚丙烯纤维混凝土),抗爆裂性能最好;相同含湿量下,通过观察受火面剥落、烧酥程度,再一次验证了防火纤维抗爆裂效果较好。通过测试不同混凝土板侧面温度场以及区域回弹值发现,由于混凝土板侧面温度值分布不同,进而造成混凝土材料回弹值的损失也不一样,材料力学性能的损失与温度场有着直接的关系。
By simulating the actual heating curve of the surface of the fire site, the critical moisture content of different fiber concrete and the mass loss of concrete under different moisture content were analyzed, and the fire test of slab concrete was carried out at the same time. The results show that the moisture content affects the degree of surface burst, the number of fractures, the seepage time and the mass loss after fire. The critical moisture content of fireproof fiber concrete burst is higher than that of the other three kinds of concrete , Polyethylene fiber concrete, polypropylene fiber concrete), the best anti-burst performance; the same moisture content, by observing the fire by surface spalling, crispness once again proved that the fire-resistant fiber anti-burst effect is better. By testing the temperature field and rebound value of different concrete slabs, it is found that the loss of rebound value of concrete is different due to the different temperature distributions on the side of concrete slab. The loss of mechanical properties is directly related to the temperature field.