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  Full-Scale Tests on Precast Tunnel Segments with Newly High Performance Steel Fibre

  The use of Fibre Reinforced Concrete in precast tunnel segments is continuously increasing. The possibility of totally substituting the ordinary steel cage with a fibre reinforcement allows several advantages related to higher quality, cracking control, sustainability and reduced costs. A new guideline concerning the use of FRC precast segment has been recently published to provide detail state of the art (ACI, FIB, ITA) and design proposal based on Model Code 2010. Particular attention was paid on enhancing the performances of the material in order to increase the segments potentials. Always taking into account the cost problem, it is possible to increase the fibre reinforced concrete properties by optimizing the concrete mix design and choosing the correct fibre reinforcement. The paper presents the results of full-scale tests performed on precast segments for a hydraulic tunnel. Two tests were considered: a bending test aiming to simulate the behaviour of the segment mainly under the provisional loading conditions and a point loads tests representative to the TBM thrust loading condition.

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