Shotcrete includes both placement processes
The American Concrete Institute defines shotcrete as concrete placed by high-velocity pneumatic projection from a nozzle. The American Shotcrete Association explains that shotcrete includes both dry-mix and wet-mix processes. Gunite is the commonly used term for dry-mix shotcrete.
Ask a bidder to name the actual process instead of relying on the two labels alone. A proposal saying “shotcrete” does not, by itself, tell you that a wet-mix process will be used.
The difference is where the water is introduced
In dry-mix shotcrete, dry ingredients travel through the hose and water is introduced at the nozzle. In wet-mix shotcrete, the ingredients, including water, are mixed before delivery to the nozzle; compressed air projects the mixture onto the receiving surface.
This describes the processes, not instructions for carrying them out. It does not establish a wall thickness, concrete strength, reinforcing layout or curing schedule for your pool. Those details belong in the project’s design and specifications.
Ask why the proposed process fits the project
ASA identifies site access, material and equipment availability, economics and contractor expertise as considerations in process selection. Discuss how materials and equipment will reach the work area and how the placement will be organized around the site.
Describe difficult access, an existing pool to retain or a proposed change in shape before comparing bids. The concrete placement method should be considered with the actual design and logistics, rather than chosen from a blanket “stronger,” “cheaper” or “longer-lasting” ranking.
- Which placement process is proposed, and why does it fit this site?
- Who will perform placement, and what relevant experience do they have?
- Which design and specifications will the work follow?
Review the quality plan rather than a material slogan
ASA notes that bond strength, strength and durability can be similar with either process. Compare how the proposal addresses the crew, equipment, specified materials, placement and curing. Ask what inspections or testing apply to the actual project and who is responsible for them.
Do not equate rapid placement with permission to skip curing or other project stages. If the proposal states a crew certification, ask for evidence covering the actual people and work involved. Confirm the project’s required inspections and specifications with the responsible professionals.
Compare the complete pool scope
The concrete shell and the interior finish are separate parts of the project. Compare plans, dimensions, reinforcing and specified shell work alongside the selected finish, tile, coping and included equipment. A difference in finish or site work can make two prices difficult to compare.
For a new pool or remodeling discussion with CPR Pools, bring the proposals and identify any requested change in process or scope. CSLB recommends keeping construction details and changes in writing. Keep the agreed specifications with the project documents.