How is shotcrete “green” technology?
1) Utilizes local materials. 2) Not much formwork, if any, required so trees are being saved. 3) Sustainable.
Where do I go to learn about shotcrete?
American Shotcrete Association (ASA) website: www.shotcrete.org
What sort of certifications are there for shotcrete contractors? Is it important to require certification?
Yes, it is important to require certification. ACI C660 - Certification of Nozzleman.
How do I specify shotcrete for my projects? What resources are available for developing performance specificaitons for shotcrete?
ACI 506.2 - Specifications for Materials, Proportioning and Application of Shotcrete. ACI 506R-05 - Guide to Shotcrete.
What are the limitations of shotcrete?
Underwater placement, pipe size.
What are the environmental benefits of shotcrete?
Shotcrete can be used to rehabilitate existing structures as opposed to demolishing a structure, which ends up in a landfill, and rebuilding the structure from new materials.
What is the smallest diameter pipe that can be repaired?
42" diameter pipe, for safety purposes.
How soon can water flow in an aqueduct or sewer that has been lined with shotcrete?
24 hours after placement of shotcrete.
Are any additional resources needed on-site for shotcrete operations?
All that is necessary is a nearby water connection that can be accessed, although in certain circumstances a water truck could be utilized if water is not available by any other means.
How much space is needed for setup of equipment?
The only space needed is just enough for a gunite rig and air compressor, which is about the equivalent of 2 pick-up trucks.