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  Rebound and Orientation of Fibers in Shotcrete

  Spraying of concrete is a widely used alternative to conventional construction techniques. The shotcrete may be reinforced with fibers to increase its mechanical performance. Because of the relatively high impact velocity, the concrete and the fibers do not adhere completely onto the treated surface and generally a large quantity of rebound is observed. Furthermore, the orientation of the fibers is not uniform in this special application technique. In this contribution, the fiber orientation of macro-synthetic plastic and steel fibers was studied in field tests. Shotcrete that was sprayed on well-defined artificial stone reliefs was analyzed by means of X-ray computer tomography. Some difference between the fiber orientation in specimens taken from cast EFNARC square panels and in specimens taken from real tunnel walls was found.

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