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  Steel fiber-reinforced concrete for precast tunnel lining segments

  Precast tunnel lining segments are often subjected to critical impact and concentrated loads especially during the construction stage. The peripheral regions of segments, such as edges and corners, are usually exposed to significantly higher stresses than the interior. Under such high stress concentrations, concrete damages in the form of cracking and spalling are very likely to occur in these surface-near areas. Compared to conventional rebar reinforcement, owing to the crack-bridging effect and a randomly discrete distribution in the matrix, steel fibers can also be used to strengthen the concrete structure, even in the concrete cover. Based on this fact, a new design concept to manufacture hybrid segments can be feasible.

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