Dense rib lateral reinforcement for confining concrete

Abstract

This study introduces a new reinforcing method laterally to confine concrete with dense reinforcement. The dense reinforcing technique can provide more confinement for concrete and increase the performance of concrete such as ductility and peak strength. However, the application of the dense reinforcement is not practical with conventional reinforcing method since the movement of gravels would be interrupted. Thus, this study places the lateral reinforcement just underneath of concrete not to prevent the gravel flowing. In the case, the reinforcement would be exposed to the problem of corrosion. To solve the problem, this study adapts stainless steel and FRP(Fiber Reinforced Polymer) that are not corrodible. Two types of concrete cylinders (300mm × 150 mm; L × D) reinforced laterally by stainless steel and FRP rings are prepared with two different volumetric ratios, and axial compressive tests are conducted to assess their performance. The dense reinforcing method with rings is successful to increase the peak strength of concrete. The effectiveness to increase peak strength is assessed according to materials and volumetric ratios. The failure mode of the dense reinforced concrete by rings laterally is different from that jacketed by steel or FRP sheet wholly. The failure is gradually processed with the fracture of each ring.