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  Durability performance of fiber reinforced shotcrete in aggressive environment

  In tunnel and mining applications spraying of concrete is a well-established and economical alternative to conventional casting techniques. Further time and cost savings are achieved when fiber reinforced concrete is applied. As consequence of stress at early age due to plastic or drying shrinkage, permanent or cyclic load stress cracks may be formed which then serve as penetration paths for aggressive solutions. The fibers reinforcing and bridging such cracks may be deteriorated and hence lose their potential to bear tensile load and hence lead to a reduction of the mechanical properties of the fiber reinforced shotcrete. The effect of the submerging of cracked shotcrete panels to different aqueous solutions which may be present in tunnels: Sodium salt, sulfate solution, acids or simply ambient wet/dry conditions on their mechanical behavior is shown. A significant drop in the load bearing capacity was observed for some fiber types.

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