ABSTRACT
Steel-fibre reinforced shotcrete has a natural tendency for preferential fibre orientation. This 2-D random distribution of fibres becomes potentially dangerous to shotcrete (especially for tunnelling purposes) considering a natural tendency for a layering effect, which others believe may be, itself, responsible for up to 40% loss of compressive strength.
Cylinder cores (taken in both directions of fibre orientation) and cubes have been used to evaluate that possibility. Two different steel-fibres were employed at three different contents. Fibre influence on voids volume and material rebound have also been studied.
