Application of Self-Compacting Concrete to the Secondary Lining of a Tunnel with a Center Wall -Construction of the intake tunnel for the Maizuru Hydroelectric Plant, Kansai Electric Power Co., Inc.- Toshiaki NAKAMURA,Toichi KURIBAYASHI, Ryota KATSURAYA, Ryohei ISHIDA The intake tunnel has a unique cross-sectional shape, with a wall provided at the center. In addition, the amount of reinforcing bars per unit volume of concrete is larger than normal tunnels. Since a sliding form was used for

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... ing the secondary concrete lining, self-compacting concrete was adopted to prevent defects such as voids due to insufficient compaction, and to facilitate concrete placement. Therefore, placement tests were performed in advance, to determine quality control criteria with which to rationalize the construction. This paper covers the outline of the placement tests performed prior to the tunnel construction; methods used to determine the quality control criteria; and results obtained during the construction