Discussion
Identify the INCORRECT statement about shotcrete.
Answer: A
The incorrect statement is the first one, because shotcrete is projected at a high velocity, not a low one. The high speed of the pneumatic jet compacts the material against the backing surface as it hits. The other statements are correct: shotcrete is the more formal name of pneumatically applied mortar or concrete, it is used for thin, lightly reinforced sections such as shell roofs and linings, and it is used to stabilise rock slopes and tunnel faces.
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