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  MiniBars(TM) – A non-corroding macro mineral fiber for rock support

  ReforceTech has developed a macro fiber type, MiniBars™, made of Alkaline Resistant-Glass or Basalt, as a durable alternative for shotcrete in tunnels. By use of MiniBars, the material use can be reduced, and thereby the CO footprint will be reduced. MiniBars has no electrical conductivity, has a density close to concrete (2100 kg/m3) and mixes easily into the concrete in sufficient large volumes to meet the specified energy absorption criteria. Due to the density, it does not float and pollute in underwater tunnels, nor does it clog the water pumps. The MiniBars™ have four bonding mechanisms; length, helix, fiber roughness and diameter. All these four parameters can be tailored to optimize the performance for a given application. Recently, an experimental program has been carried out to quantify the necessary fiber amount to reach E700 and E1000 per the Norwegian Concrete Association’s Publication No 7.

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