Shotcrete is a very useful product in the slope stabilization industry. Shotcrete is a pneumatically applied concrete with extremely high compressed strengths and a very high early yield. It can be used in many different fashions to retain unstable rock/earth, repair weathered concrete and create functional structures. Shotcrete can be applied in two different methods, Dry and Wet application. Both applications have their advantages and often the application is dictated by the site and its conditions. At Norpac we are extremely comfortable applying Shotcrete using both applications and we have extensive experience in both vertical and overhead nuzzling.
Shotcrete is often used in shoring applications where unstable rock or earth needs to be retained. Wet shotcrete is the common medium used in urban shoring applications and large structural walls. These shoring systems are often complimented with some sort of tie back anchoring system either in a temporary or permanent design. Dry shotcrete is often used in remote sites where wet shotcrete cannot be batched. Dry shotcrete is commonly used in overhead applications, sites that require long distance conveyance, concrete repair, underground applications and art décor type projects. Many of our nozzlemen have the highest degree of training and are ACI certified. Our junior Nozzlemen are all mentored by senior ACI certified Nozzlemen.
Underpinning is a specialized shoring method that allows the foundation of a structure to be extended downward as an excavation project is being executed in close proximity. As the excavation beside an erected structure is taking place small panels of soil are removed from beneath the structure. The panels are quickly tied with structural rebar and Shotcrete is placed. This panel cures to 28mpa with 24hrs and subsequent panels can be removed and replaced with shotcrete until an entire lift has been added. This process can be repeated until the footing has been extended to the required depth. This is a very helpful technique that needs to be designed by an engineer and constantly monitored to make sure that no damage is being done to the existing structure.