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- W2083027613 abstract "Concrete-filled steel tubular columns (CFTs) are becoming widely used in engineering. In the present paper, the addition of fly ash and an expansive agent to the concrete of CFTs or a thin layer of fly ash to the interface between steel tube and concrete (CFTFCs) to improve the compressive strength and the bond strength of CFTs was experimentally investigated. The results show that the expansive concrete-filled steel tubular columns (CFETs) have the highest bond strength and compressive strength at the age of 7 days, and CFTFCs have higher bond strength and compressive strength than fly ash concrete-filled steel tubular columns (CFFTs), which in turn are higher than CFTs. However, both bond strength and compressive strength of CFTFCs become the highest at the age of 28 days. The morphology (size and shape) of mineralogy and microstructure of the interface at the age of 28 days were also investigated by using both scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). It is shown that the strength improvement of CFTFCs mainly depends on the content of SiO2 and CaO in the interface, and higher content of SiO2 and/or lower content of CaO are preferred." @default.
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- W2083027613 date "2003-05-01" @default.
- W2083027613 modified "2023-09-30" @default.
- W2083027613 title "Improve the strength of concrete-filled steel tubular columns by the use of fly ash" @default.
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- W2083027613 doi "https://doi.org/10.1016/s0008-8846(02)01037-2" @default.
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