Concrete Structures Inspection: Shotcrete Mobile App

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  Shotcrete is a special type of concrete (or mortar) that is applied under pressure through a hose.

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  The specifications allow for both:

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  dry-mix shotcrete (for mortar only), in which water is added at the hose nozzle; and

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  wet-mix shotcrete, in which additional air is added at the hose nozzle.

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  The key points for inspecting shotcrete operations are:

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  the foundation must be:

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  finely graded to the planned lines and grade,

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  thoroughly compacted, and

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  uniformly moistened;

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  forms must be:

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  able to resist deflection from the pressurized placement, and

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  designed to allow air and rebound to escape;

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  reinforcement is usually welded-wire mesh and must be securely positioned and supported to resist...

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  ground or gauging wires must be installed, where necessary, to control the thickness and grade o...

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  shotcrete may not be placed when:

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  rain would wash the shotcrete,

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  wind would separate the flow of materials as they spray out of the nozzle, or

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  the air temperature (in the shade) falls below 40° F

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  shotcrete must be properly applied by:

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  maintaining an approved uniform rate,

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  keeping the nozzle perpendicular to and 2-5 ft.

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  minimizing and removing any rebound, and

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  leave a natural gun (nozzle) finish (unless otherwise specified); and

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  curing must last at least seven days by:

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  continuous water spray or fog,

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  curing compound, or

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  polyethylene plastic sheeting.

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  Even after concrete is placed, there are still several other processes to be completed.

• ...and More!