Title:
On the Rebound (Minimizing Shotcrete Rebound with Fibers)
Author(s):
Hugo S. Armelin and Nemkumar Banthia
Publication:
Concrete International
Volume:
20
Issue:
9
Appears on pages(s):
74-79
Keywords:
metal fibers; shape factor; shotcrete;
DOI:
Date:
9/1/1998
Abstract:
In dry-mix shotcrete, rebound is responsible for a loss of 70 to 80 percent of the steel fibers with significant implications on the cost and durability performance of the material. This inefficiency in the process stems, in great part, from the fact that the fibers available in today’s market were developed for conventional cast concrete without any consideration to shotcrete rebound.In this article, several steel fiber shapes and geometries were tested in a laboratory controlled shotcrete environment to evaluate the influence of parameters of specific projected area, fiber length, fiber diameter, and aspect ratio on rebound. The results indicate that fibers of a significantly lower rebound can be obtained by proper dimensioning of the fiber geometry. It is expected that the results described in this article will have a direct application in the steel fiber industry and lead to fibers specifically developed and optimized for shotcrete performance.