Does the contractor have the experience and adequately qualifield nozzlemen and finisher to perform quality work? Does the contractor have the right equipment available?The answers to all these questions will help in the selection of the most appropriate materials, mixture design(s), supply, and application methods.
The most important factor in the selection of dry&wet-mix shotcrete. Although shotcrete started initially as a dry-mix process in the early 1900s, the development of efficient small-line concrete pumps for wet-mix shotcrete has enhanced the production placement rates of shotcrete, and so the tendency today is to increasingly use wet-mix
Shotcrete on the majority of projects. The introduction of the shotcrete-placing boom has greatly improved production on large-volume applications and has doubled or tripled production on many mining and tunneling projects. The dry-mix shotcrete process, however, is still a well-known and proven procedure that is readily available and can be used economically for specific applications where logistics and accessibility are major concerns.
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