THE FLEXURAL BEHAVIOR OF STEEL TUBE FILLED WITH PVA FIBER-REINFORCED CEMENT COMPOSITES INCORPORATING RECYCLED MATERIALS

This paper describes the flexural behavior of steel tube filled with PVA fiberreinforced cement composites (PVA FRCC) incorporating recycled materials such as fly-ash and recycled sand. The purposes of this paper are to experimentally investigate the failure modes, relationship between load, deformation, and stress distributions of FRCC filled steel tubular (FFST) members under bending force. To reduce a large amount of carbon dioxide emissions from prodiction of construction materials, cement and natural sand were partially replaced by fly-ash and recycled sand were replaced when mixing the FRCC. It was confirmed from the tests for mechanical properties of the FRCC that the compressive strength of the FRCC-R mixture with recycled materials was lower than those of the other mixture because the strength development of the FRCC-R mixture was delayed due to use of fly-ash. However, the FRCC0R mixture showed higher tensile strength due to high fineness of the fly-ash replaced in it. And flexural test results showed that the specimen filled with the FRCC-R mixture showed deeper indentation of about 10 mm and exhibited larger ductility and energy dissipation capacity than other specimens due to a redistribution of deformation throughout the steel tube