Certification vs. Qualification of Shotcrete Nozzlemen In 2000, ACI, in cooperation with ASA, established a formal certi?cation program for certifying shotcrete nozzlemen. By shotcreteweb|2022-02-16T16:55:19+00:00January 3rd, 2010| Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail About the Author: shotcreteweb