Flexural Performance and High Temperature Resistance of Slurry-Infiltrated Fiber-Reinforced Cementitious Composite Materials

Cheolwoo Park, Yong Sik Kwon, Min Kyu Ju, Eunho Lee, Dong Jun Kim, Seungwon Kim
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Abstract

The slurry-infiltrated fiber-reinforced cementitious composite (SIFRCCs) material used to show much greater flexural strength and fracture toughness than normal cement concrete. By using these performance, the SIFRCCs could be applied for the blast resistant structures such as military purpose structures. However, most gas explosions are accompanied with fire afterward so that these high fracture toughness material needs high temperature resistance simultaneously. The SIFRCCs in this study contains fibers up to 5% by volume fraction. In addition, polymer powder was incorporated into SIFRCCs in order to enhance the fire resistance. The flexural strength and fracture toughness were compare with respected to the variation of polymer powder content, 0%, 0.5%, 1.0% and 1.5%. Powder polymer create capillary pores due to melting and burning when exposure to high temperature and minimize the vapor pressure inside the concrete model and reduces the failure of the concrete model. Specimens were covered with single layer of basalt sheet to study the flexural properties of SIFRCCs with basalt fiber sheet. The flexural strength and toughness of the specimens were investigated before and after the high temperature exposure per ISO 834 standard fire curve.

浆液浸润纤维增强水泥基复合材料的挠曲性能和耐高温性能
与普通水泥混凝土相比,浆液渗透纤维增强水泥基复合材料(SIFRCCs)具有更高的抗折强度和断裂韧性。利用这些性能,SIFRCC 可用于抗爆结构,如军用结构。然而,大多数气体爆炸后都会伴有火灾,因此这些高断裂韧性材料需要同时具有耐高温性能。本研究中的 SIFRCC 含有高达 5%体积分数的纤维。此外,还在 SIFRCC 中加入了聚合物粉末,以增强其耐火性。比较了聚合物粉末含量(0%、0.5%、1.0% 和 1.5%)变化时的抗弯强度和断裂韧性。聚合物粉末在高温下熔化和燃烧时会产生毛细孔,从而将混凝土模型内部的蒸汽压降至最低,减少混凝土模型的破坏。为了研究带有玄武岩纤维片的 SIFRCC 的抗弯性能,试件上覆盖了单层玄武岩片。根据 ISO 834 标准防火曲线,研究了高温暴露前后试样的抗弯强度和韧性。
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CiteScore
1.70
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