Shotcrete Versus Gunite
Shotcrete and Gunite are completely different
Description of Shotcrete Simply stated Shotcrete (wet mix CONCRETE process) is CONCRETE and can be tailgated, pumped or vibrated, when air is added at the point of discharge the concrete being placed remains concrete with increased velocity to help in vertical placement , THE NOZZLE CAN BE REMOVED AT ANY TIME – THE CONCRETE CAN BE PUMPED and vibrated in congested or horizontal applications
Description of Gunite (dry mix process-Shotcrete) Material is generally mixed at the job-site or pre-bagged and contains only fine aggregates – the material is transported thru a hose or pipe in the dry state then water is injected at the nozzle to hydrate the mix, this process requires great skills in the hydration process. Gunite (dry mix process Shotcrete) has been used for years in swimming pool construction and concrete repair.
Structural Concrete applications may be limited with this process due to aggregate size limitations also the hydration at the point of discharge, may lead to incomplete W/C (water cement ratio) depending on the experience of the Nozzleman and the moisture content of the aggregate.
SHOTCRETE IS CONCRETE The goal of the Shotcrete Concrete Contractors Association is to offer Specifications and Guidance in the use of Shotcrete (wet mix concrete process) as means and methods for placing concrete in the Structural Concrete Industry.
President’s Comments
I have been in Gunite / Shotcrete industry for over 40 years started as a laborer, foreman, superintendent – owner. I have been asked to explain the difference between Gunite and Shotcrete almost every day for the past 30 years. The questions seems to always be the same what is the difference between the two.
In the Shotcrete process the answer is simple
The Aggregates and Cement Powder - are mixed completely with the Water ,creating WET MIX CONCRETE.
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