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17/08/2018

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Shear Capacity of Self-Compacting Concrete.

Since its appearance on the Japanese market in the eighties Self-Compacting Concrete has really thrived all over the world. Much research has already been devoted to the fresh properties of the concrete. There nevertheless still exist some questions with regard to the mechanical properties of this innovative material. Shear capacity is one of the topics of concern. The high paste volume and associated lower aggregate volume necessary to achieve the desired fluidity and self-compacting ability of the concrete may reduce its shear capacity, since this might for instance reduce aggregate interlock. Therefore in this study full scale beam specimens were tested under four point-bending load, measuring not only force but also deflections and crack development. The shear capacity of several self-compacting concrete mixtures is examined and compared to that of traditional, vibrated concrete. The influence of different parameters such as reinforcement ratio and geometry of the beams on the shear capacity is investigated. The experimental results were compared with those obtained for traditional, vibrated concrete and with Eurocode 2 predictions. The occurring failure modes were also examined. The results of this research tend to indicate that self-compacting concrete is characterized by a similar to even slightly better shear capacity than traditional vibrated concrete. Eurocode 2 still provides a safe prediction of the shear capacity of self-compacting concrete.

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