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Title: 506.5R-09: Guide for Specifying Underground Shotcrete
Author: ACI Committee 506
Year of Publication: 2009
Number of Pages: 52
This document is: Active
Nonmember Price: $76.50
ACI Member Price: $46.00
Order Code: 506509
Abstract: Click here to view the first few pages of this publication - pdf file format
This document provides a guide for owners, contractors, designers, and testing, specifying, and inspection organizations engaged in the application of shotcrete for underground support. The guide provides general information for the selection of constituent materials, and methods to proportion shotcrete. Typical methods of batching, mixing, and handling of proportioned shotcrete materials are detailed along with shotcrete placement methods and equipment. Keywords: acceptance criteria; batching; inspection; methods of payment; mine and tunnel support systems; mixing and placement equipment; mixture proportioning; preconstruction and construction testing; quality assurance; quality control; safety; shotcrete; shotcrete application.
Contents: Chapter 1—Introduction and scope, p. 506.5R-3 1.1—Introduction 1.2—Scope Chapter 2—Notation and definitions, p. 506.5R-5 2.1—Notation 2.2—Definitions Chapter 3—Submittals, p. 506.5R-6 3.1—Contracts 3.2—Recommended specifications Chapter 4—Materials, p. 506.5R-8 4.1—Accelerators 4.2—Recommended specifications Chapter 5—Anchorage and reinforcement, p. 506.5R-11 5.1—Composite support systems 5.2—Shotcrete with pattern rock bolts or anchors 5.3—Shotcrete with rock bolts, friction stabilizers, and welded wire reinforcement 5.4—Fiber-reinforced shotcrete 5.5—Shotcrete with lattice girders 5.6—Shotcrete with conventional steel sets 5.7—Recommended specifications Chapter 6—Materials handling and storage, p. 506.5R-15 6.1—General 6.2—Temperature considerations 6.3—Recommended specifications Chapter 7—Shotcrete mixture proportioning, p. 506.5R-16 7.1—General 7.2—Mixture proportions by trial batching or historical data submissions 7.3—In-place mixture proportions 7.4—Dry-mix shotcrete 7.5—Wet-mix shotcrete 7.6—Recommended specifications Chapter 8—Performance requirements, p. 506.5R-20 8.1—General 8.2—Water-cementitious material ratio 8.3—Air content 8.4—Slump 8.5—Boiled absorption and permeable voids 8.6—Compressive strength 8.7—Flexural strength and toughness 8.8—Early-age strength 8.9—Other tests 8.10—Bond strength 8.11—Explosive spalling protection 8.12—Recommended specifications Chapter 9—Quality assurance and quality control, p. 506.5R-23 9.1—General 9.2—Recommended specifications Chapter 10—Preconstruction trials and testing, p. 506.5R-24 10.1—General 10.2—Recommended specifications Chapter 11—Construction acceptance inspection, p. 506.5R-27 11.1—General 11.2—Acceptance inspection 11.3—Specific inspection and test quality control requirements for underground shotcrete 11.4—Cold placement conditions 11.5—Hot placement conditions 11.6—Shotcrete acceptance and rejection 11.7—Recommended specifications Chapter 12—Batching, mixing, and supply, p. 506.5R-31 12.1—Handling of bulk bin-bags 12.2—Quality control considerations 12.3—Recommended specifications Chapter 13—Placing equipment, p. 506.5R-34 13.1—Pumps 13.2—Guns 13.3—Nozzle systems 13.4—Remote-controlled spraying 13.5—Recommended specifications Chapter 14—Auxilliary equipment, p. 506.5R-37 14.1—Air supply 14.2—Recommended specifications Chapter 15—Safety, p. 506.5R-39 15.1—General 15.2—Underground safety 15.3—Required personal safety equipment 15.4—View of shotcrete work 15.5—Communications 15.6—Nonpersonal safety equipment 15.7—Recommended specifications Chapter 16—Preparation for shotcreting and groundwater control, p. 506.5R-41 16.1—General 16.2—Factors affecting shotcrete adhesion and bonding 16.3—Surface preparation 16.4—Groundwater 16.5—Recommended specifications Chapter 17—Ground reinforcement installation, p. 506.5R-43 17.1—General 17.2—Rock bolt installation 17.3—Steel set installation 17.4—Lattice girder installation 17.5—Recommended specifications Chapter 18—Shotcrete application, p. 506.5R-44 18.1—Methods used to control thickness 18.2—Cover, alignment, and tolerance 18.3—Recommended specifications Chapter 19—Curing and protection, p. 506.5R-46 19.1—General 19.2—Protection 19.3—Recommended specifications Chapter 20—Shotcrete for repair and rehabilitation of underground structures, p. 506.5R-47 20.1—General 20.2—Materials selection 20.3—Shotcrete placement methods for repair 20.4—Quality assurance requirements for rehabilitation of underground structures 20.5—Repair considerations 20.6—Recommended specifications Chapter 21—Measurement and payment, p. 506.5R-50 21.1—Basis for payment 21.2—Recommended specifications Chapter 22—References, p. 506.5R-51 22.1—Referenced standards and reports 22.2—Cited references
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