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首页> 外文会议>RILEM Proceedings PRO 39; RILEM Symposium on Fibre-Reinforced Concretes(FRC) - BEFIB 2004 vol.1; 20040920-22; Varenna(IT) >CEMENTITIOUS MATERIALS WITH HYBRID FIBERS EXPOSED TO HIGH TEMPERATURES
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CEMENTITIOUS MATERIALS WITH HYBRID FIBERS EXPOSED TO HIGH TEMPERATURES

机译：高温下混合纤维的胶凝材料

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摘要

Extreme environmental conditions, such as exposure to high temperatures, are serious potential risks for buildings and structures. The behavior of concrete, after exposure to a high temperature, depends upon the specific concrete mix proportions, the constituents used and the physicochemical transformations that the heating generates. Within this context, the damage, after thermal treatments, in cement-based matrices was studied using compression and three-point bending tests. Four types of high performance cement based composites were prepared using fiber combinations of polypropylene and steel fibers. Specimens were treated in an electric furnace at 250℃, 500℃ and 750℃. The corresponding compressive and bending strengths were determined, and fracture behavior was studied using interferometric measurements. A physical analysis was also performed by the use of Mercury Intrusion Porosimetry (MIP) and microscopy observation (SEM). For the considered combinations, it was demonstrated that a hybrid mixture of steel and polypropylene fibers appears to be not particularly effective in enhancing the performance of concrete at high temperatures. With the considered heating rate, explosive spalling was not observed in concrete specimens during the thermal treatment, but a melting of steel fibers after the treatment at 750℃ was detected.
机译：极端环境条件（例如暴露于高温）是建筑物和结构的严重潜在风险。混凝土在暴露于高温后的性能取决于特定的混凝土配合比，所使用的成分以及加热产生的物理化学转变。在这种情况下，使用压缩和三点弯曲试验研究了热处理后对水泥基材料的破坏。使用聚丙烯和钢纤维的纤维组合制备了四种类型的高性能水泥基复合材料。样品在电炉中分别在250℃，500℃和750℃下处理。确定了相应的抗压强度和弯曲强度，并使用干涉测量法研究了断裂行为。还通过使用水银压入孔率法（MIP）和显微镜观察（SEM）进行了物理分析。对于所考虑的组合，证明了钢纤维和聚丙烯纤维的混合混合物对于提高高温下的混凝土性能似乎不是特别有效。在考虑了加热速率的情况下，在热处理过程中在混凝土试样中未观察到爆炸剥落，但在750℃处理后发现钢纤维熔化。

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