This web session presents information about ACI 506R-05, “Guide to Shotcrete.” This document is not a “how-to” book, nor is it a design guide; however portions of the document may be rewritten in mandatory language and found in contract documents. The document defines shotcrete as mortar or concrete pneumatically projected at high velocity onto a surface. The document also presents information about materials, equipment, crew organization, quality control, and more. This presentation, Guide to Shotcrete, was made by Lars F. Balck, at the ACI Spring 2012 Convention. A free ACI Web Session of this presentation is available at the ACI Web Sessions page at