In wet-mix shotcrete, the nano-silica's spontaneous binding capacity enables nozzlemen to reach a specified lining or cover thickness in fewer passes versus application of a conventional silica fume mix.
In a report for the journal Shotcrete, GCP Global R&D Director, Concrete Products Klaus-Alexander Rieder and R&D Division Concrete Scientist Ezgi Yurdakul review critical wet-mix shotcrete aspects: "Sprayability is the efficiency of a mixture at sticking to the applied surface (adhesion) and to itself (cohesion).
When added to a wet-mix shotcrete, the RC agent significantly increases cohesiveness while reducing bleeding and segregation.
Pumpability and shootability are important functional parameters considered in the design procedure for wet-mix shotcrete (WMS) mixtures .
Burns, Characterization of wet-mix shotcrete for small line pumping [M.
Atlas Copco's self-contained, mobile MEYCO Versa concrete spraying system allows wet-mix shotcrete
to be applied accurately underground by a single operator.
Typically, a wet-mix shotcrete
process generates less airborne particles and rebound (waste) than gunite, simply because the material has 100% of the moisture added to it.
Had cracks in the underlying concrete been sealed properly to stop leaks, and had wet-mix shotcrete
been applied by a well-trained, conscientious crew, city officials likely would have gotten the results they wanted.
Wet-mix shotcrete has been specified for the final shaft lining, and the local subsidiary of Swiss-based specialist supplier, MBT, won a R1.
Although this has been the first time that wet-mix shotcrete has been used in this type of situation, all-in-all the system has worked very well, providing a high-strength final lining for the shaft faster than other methods, allowing other operations in the shaft to resume sooner and so benefiting the overall sinking schedule.
DICOM applies mechanized, wet-mix shotcrete
, working with Putzmeister machinery.
In 1993, Inco successfully introduced wet-mix shotcrete
as a replacement for dry shotcrete at its Frood mine, adjacent to Stobie, as a principal means of support in challenging ground conditions.