BFRP bar reinfo rced cellular concrete slabs fabricated with saturated super absorbent polymers were subjected to static three-point bending to investigate its mechanical characteristics,crack propagation law,failure mode,flexural deformation and local strain.The results showed that the flexural stiffness was the key factor leading to the different behaviors.Three types of specimens obtained different flexural stiffness which was SP>BP>BS.Since the elastic-plastic property of steel bars and linear elastic property of BFRP bars,the BS and BP demonstrated a two-stage failure mode with elastic deformation and failure.After cracking of concreteand yielding of steel bar,the flexural stiffness of SP gradually decreased and became smaller than that of BP with significant ductile deformation before bending failure.The BS and BP gained large flexural deflection,small residual deflection and significant cracking.Meanwhile,due to the lack of aggregate interlock and dowel effects of reinforcements,specimens were more likely to shear failure with obvious brittle characteristics.
关键词
吸水树脂/混凝土/静力抗弯性能/破坏模式/挠曲变形/极限承载力
Key words
super absorbent polymer/concrete/static-bending performance/failure mode/flexural deflection/ultimate bearing capacity
万方数据