ABSTRACT
Abstract Despite its widespread application throughout the world, dry-mix shotcrete has as one of its main drawbacks a high rebound rate, which can lead to losses of up to 50% for the aggregate phase and 70% for the steel fibres. In this preliminary study, kinematic values of particle velocity and acceleration were evaluated for individual aggregate and steel fibre particles using a high-speed camera capable of up to 1000 frames per second. The influence of variables of air volume, nozzle type, shooting direction, aggregate size and steel-fibre geometry on particle velocity and acceleration were also evaluated.
