FLEXURAL BEHAVIOUR OF STEEL FIBER-REINFORCED RECYCLED AGGREGATE CONCRETE BEAMS REINFORCED WITH BFRP REBARS

Abstract

Abstract: In order to investigated the influence of the different volume fraction of steel fibers v_sf (0.5%, 1%, 1.5%, 2%), longitudinal reinforcement ratio ρ and recycled aggregate replacement rate R (0, 50%, 100%) on the bending behaviour of steel fiber reinforced recycled concrete beams reinforced with BFRP bars (BFRP-SFRAC) beams, the bending performance tests of nine BFRP-SFRAC beams and one steel fiber reinforced recycled concrete beams reinforced with steel bars (control beam) were carried out. The failure mode, flexural capacity and deflection deformation, etc., were analyzed. The results show that the section strain of BFRP-SFRAC beams meets the plane section assumption, and the descending branch of the load-deflection curve of the BFRP-SFRAC beam has a smooth drop, which indicates that the post-peak behaviours of the BFRP-SFRAC beams show better ductility characteristics. The flexural capacity of BFRP-SFRAC beams is greatly affected by reinforcement ratio ρ and volume fraction of steel fiber v_sf, and less affected by replacement ratio of recycled aggregate. Both the initial cracking load and the ultimate load increase with the increase of the volume fraction of steel fiber v_sf, but it does not always increase linearly, while the deflection deformation decreases. It is also found that the initial cracking load of the BFRP-SFRAC beam is slightly lower than that of the control beam, but the ultimate load is obviously improved.

Key words: BFRP bar, steel fiber, recycled aggregate concrete beams, flexural capacity, replacement ratio of recycled aggregate

CLC Number:

TB332

KONG Xiang-qing, HAN Fei, XING Li-li, WANG Xue-zhi. FLEXURAL BEHAVIOUR OF STEEL FIBER-REINFORCED RECYCLED AGGREGATE CONCRETE BEAMS REINFORCED WITH BFRP REBARS[J]. Composites Science and Engineering, 2019, 0(11): 5-11.

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