Process dependence of shotcrete for repairs

In the study presented here, the authors illustrate that the properties of steel fibre reinforced shotcrete are a function of the manufacturing process. The paper examines the causes for the higher penetration resistance in dry-mix shotcrete, while highlighting the differences in composition and rebound during the fresh state. A strong influence of the spray process is witnessed on the hardened properties under both compression and flexure. For an identical fibre content, the toughness of shotcrete is noticeably different from that of the corresponding cast concrete. It is seen that the optimal post-crack performance is achieved via the wet process technique.