高流動コンクリートを用いた鉄筋コンクリートはりの力学的性状に及ぼす鉛直打継目の影響(<特集>コンクリート用骨材・混和材料)

概要

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Self-compacting concrete has an unique characteristic which may influence on the flexural and/or shear strength of a reinforced concrete beam with vertical construction joint. In this research vertical construction joint was intended to be present either in the mid-span of the beam or in the middle of the shear span. Crack initiation loads, the crack width, failure loads and failure modes were investigated. With the vertical construction joint present in the midspan the crack initiation load was reduced to 60% of that of a control beam without joint. In addition, increased loads resulted in the substantial increase of the crack width. On the other hand, flexural crack formed at the construction joint in the middle of the shear span with lower loads leading to the shear failure with about 75% of the ultimate load of a control beam with an equal steel ratio.
2000-10-15