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

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.