Abstract
The excellent performance of steel and basalt fiber at room and high temperatures makes steel-basalt hybrid fibers reinforced cementitious composites (SBFRCC) a promising solution for engineering structures with fire risk. In this study, the morphology, explosive spalling behavior, flexural, compressive and splitting tensile strength, and uniaxial tensile properties of SBFRCC with different substitution rates of fly ash after exposure to high temperatures were studied. In addition, the effects of high temperature on the microstructures of SBFRCC were investigated by the scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and X-ray computed tomography (XCT) tests. The results show that the incorporation of steel fiber and basalt fiber can significantly improve the explosive spalling behavior, flexural and splitting tensile strength. After exposure to high temperatures, increasing the substitution rate of fly ash properly can reduce the rate of strength degradation to some extent, but will reduce the compressive strength and increase the explosive spalling rates. The microstructures of SBFRCC become loose and the porosities of SBFRCC increase under the combined effect of the decomposition of hydration products, the melting of fly ash, and the deterioration of steel fiber and basalt fiber.
Published Version
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