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论文类型：会议论文

发表时间：2010-06-07

收录刊物：EI、Scopus

卷号：2

页面范围：953-963

摘要：This paper presents an investigation on the ability of UHTCC to translate macrocracks in reinforced concrete beams into multiple micro-cracks in composite UHTCC/ RC beams where a layer of UHTCC replaces concrete cover to protect longitudinal tensile steel bar. Four point bending tests were performed on various UHTCC/RC composite beams. The reinforcement ratio of longitudinal tensile steel bar and the thickness of UHTCC layer were two varying parameters. It is discovered that the use of UHTCC layer leads to the improved load capacity and deformation capacity when compared to reinforced concrete beam. As the reinforcement ratio increases the degree of improvement becomes less significant. The thickness of UHTCC layer has little impact on load and ductility of the composite beam, provided that enough bond between concrete and UHTCC layer is ensured. For all tested UHTCC/RC beams, crack opening under service loading condition is effectively controlled within 0.1 mm. ? 2010 Taylor & Francis Group, London.