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2016SummerShotcreteEMag

ACI Committee 506, Shotcreting— Activities Update ACI Committee 506, Shotcreting, is one of the most active technical committees of the American Concrete Institute (ACI). Formed in 1960 to address some of the needs of the industry, the committee has evolved over the years to cover many aspects of the shotcrete process. Today, the ACI 506 library includes a guide, a specification document, and other documents pertaining to the evaluation of shotcrete, underground applications, and fibers (refer to Table 1). As many readers may know, one of the biggest challenges for a technical committee covering a number of documents is to preserve coherence between those documents while keeping their content up to date and as valuable as possible to the industry. Needless to say, this can prove difficult to achieve across the entire document library. Very conscious of the rapid evolution of the industry over the last two decades (one simply has to look at the content of this magazine over the last 15 years to verify that statement!), and the increasing attention given to quality control and acceptance as a whole, all of the subcommittees started in a serious effort to address this challenge a few years ago. The strategy was to start with our core documents (Guide and Specification documents) and then follow with our equally important companion documents. This article therefore aims at presenting some of the advances made so far, as well as the strategy By Marc Jolin adopted for some of the documents currently being revised/rewritten. Guide and Specification One of the first steps taken was to initiate a parallel revision of our aging 506.2-13, Specification for Shotcrete, document (previous version dated back to 1995) and our 506R-16, Guide to Shotcrete (previous version dated back to 2005). Indeed, years of feedback from the industry showed that these two documents were often confused or considered as one by many specifiers1; although this can be an advantage, because it puts the Guide in more hands (therefore disseminating more information on proper shotcreting technique), it had the potential to create complex situations— and even legal problems—if there were any discrepancies between the Specification and the Guide at any given point in time. This is where the first steps in our efforts to align our document Table 1: ACI Committee 506 Library as of July 2016 Current Documents Subcommittee Name Subcommittee Chair 506R-16, Guide to Shotcrete 506-C, Guide Lars Balck Jr. 506.1R-08, Guide to Fiber-Reinforced Shotcrete 506-B, Fiber-Reinforced Jeffrey Novak 506.2-13, Specification for Shotcrete 506.2M-13, Specification for Shotcrete (Metric) 506-E, Specifications James Ragland 506.4R-94, Guide for the Evaluation of Shotcrete 506-A, Evaluation Simon Reny 506.5R-09, Guide for Specifying Underground Shotcrete 506-F, Underground Lihe (John) Zhang 1 It should be noted that the only document that can appear in contractual documents is the ACI 506.2, Specification for Shotcrete, because it is the only one written in enforceable mandatory language and offering defaults, values appropriate for specifications. 22 Shotcrete • Summer 2016


2016SummerShotcreteEMag
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