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Title: Understanding Shotcrete -- The Fundamentals

Author(s): James Warner

Publication: Concrete International

Volume: 17

Issue: 5

Appears on pages(s): 59-64

Keywords: mix proportioning; mortar (materials); nozzles; rebound; shotcrete; water-cement ratio; Construction

DOI:

Date: 5/1/1995

Abstract:
Shotcrete is sprayed concrete or mortar. More precisely as defined by the American Concrete Institute, shotcrete is mortar or concrete pneumatically projected at high velocity onto a surface. There are two distinct types of shotcrete, dry mix and wet mix. In the dry mix process, the dry ingredients are mixed, then blown through the delivery hose in a stream of compressed air to the nozzle, where the water is added. In the wet mix process, all ingredients including the water are combined in the mixer, and the resulting mix propelled to the nozzle where a blast of compressed air impels it onto the receiving surface.