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Concrete Structures Inspection: Shotcrete Mobile App

Shotcrete is a special type of concrete (or mortar) that is applied under pressure through a hose. It is commonly used for sloped surfaces in ditch pavement or sloped surfaces under bridges.

  • Lendlease
  • The Cooperative
  • PG&E
  • Red Bull
  • Mirvac

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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!

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