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  Full-scale tests on precast tunnel segments in fiber reinforced concrete

  The use of Fiber Reinforced Concrete in precast tunnel segments is continuously increasing. The possibility of totally substituting the ordinary steel cage with a fiber reinforcement allows several advantages related to higher quality and reduced costs. Several researches were developed on the field [1-5], showing the feasibility of this solution. A 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 fiber reinforced concrete properties by optimizing the concrete mix design and choosing the correct fiber reinforcement. Furthermore, the development of codes that allow the design of Fiber Reinforcing Concrete was boosting the use of this material in tunnel segments [6-7]. 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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