Low-Pressure Shotcrete (1,200 to 2,000 psi or 8.3 to 13.8 MPa): Low-pressure shotcrete is commonly used for applications where a more gentle application is needed, such as vertical and overhead surfaces, thin coatings, and decorative finishes. It is often applied with dry-mix equipment (gunite) and is sometimes referred to as "dry-mix shotcrete."
High-Pressure Shotcrete (2,000 to 2,500 psi or 13.8 to 17.2 MPa): High-pressure shotcrete is used for structural applications where higher strength and bonding are required. It is often applied with wet-mix shotcrete equipment and is sometimes referred to as "wet-mix shotcrete." High-pressure shotcrete is suitable for applications like tunnel lining, slope stabilization, and structural repairs.
The choice between low-pressure and high-pressure shotcrete depends on the specific project requirements, including the thickness of the application, the desired finish, and the need for structural strength. It's important to consult with experienced professionals and follow project specifications to determine the appropriate pressure for your shotcrete application.
Proper shotcrete application involves not only the pressure but also factors like the mix design, curing practices, surface preparation, and quality control to ensure that the shotcrete meets the desired strength, durability, and performance criteria.
