Shotcrete is a construction method that involves spraying concrete onto surfaces at high velocity. This technique is commonly used for building structures like tunnels, swimming pools, and retaining walls. The process allows for quick application and can conform to complex shapes, making it versatile for various projects. There are two main types of shotcrete: dry-mix and wet-mix. In dry-mix shotcrete, dry materials are mixed and then combined with water at the nozzle. In wet-mix shotcrete, all ingredients, including water, are mixed before being sprayed. Both methods provide strong, durable surfaces suitable for many applications.