Shear Walls, Moment Frames and Foundations
One-sided concrete applications, where only one side of the formwork is installed, can benefit greatly from shotcrete. With this method, up to 95% to 100% of the required formwork can be eliminated, leaving only construction joints and perimeters to be framed. Shotcrete also eliminates the need to engineer the forms, as there are no internal pressures from the fresh concrete. However, for double-sided walls, a rigid back form or stay form must be used in conjunction with shotcrete
Support of Excavation, Stabilization and Slope Protection
Usually, these structures serve as temporary supports during the construction process, providing an extra layer of protection for workers. They are typically buried or covered by the structural applications once the construction is completed.
Shotcrete is the most efficient, economical, and effective repair process for concrete. It outperforms form and pour or form and pump applications. While properly prepared surfaces, water saturation (SSD), and application techniques are crucial for all repair types, shotcrete eliminates the need for bonding agents and formwork, and typically exceeds the requirements outlined in the specifications.
Working with the tide can be extremely challenging due to the limited window of availability that changes every day. However, shotcrete can make this process much easier by eliminating the need for formwork and allowing for immediate application of concrete after placing the rebar. To achieve this, special equipment is used to inject a chemical directly into the concrete before it is shot into place. This chemical accelerates the curing process of the cement paste, enabling the concrete to reach initial set before the tide comes in.
Mock Ups and Testing
A mock-up is a test that assesses the abilities of craftsmen installing products without risking any production work. It is built from a snapshot of the project and subjected to destructive testing, allowing inspectors to assess the competencies of the contractor and crew, compression strength of the concrete, and nozzleman ability. The panels are cored or saw-cut to reveal the encapsulated rebar and inspect for defects or voids in the sample. In most cases, mock-ups demonstrate the surface finish that will be applied.