ACI 506.5 2022

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ACI PRC-506.5-22: Specifying Underground Shotcrete – Guide

Published By	Publication Date	Number of Pages
ACI	2022

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Category: ACI

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Description

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(s); mixing; mixture proportioning; placement; quality assurance; quality control; safety; shotcrete; testing; tunneling.

PDF Catalog

PDF Pages	PDF Title
3	TITLE PAGE
5	CHAPTER 1—INTRODUCTION AND SCOPE 1.1—Introduction
6	1.2—Scope
7	CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation 2.2—Definitions
8	CHAPTER 3—SUBMITTALS 3.1—Submittal process
9	3.2—Recommended specifications CHAPTER 4—MATERIALS 4.1—Accelerators
10	4.2—Recommended specifications
12	CHAPTER 5—ANCHORAGE AND REINFORCEMENT 5.1—Composite support systems
13	5.2—Shotcrete with pattern rock bolts or anchors 5.3—Shotcrete with rock bolts, friction stabilizers, and welded wire reinforcement
14	5.4—Fiber-reinforced shotcrete
15	5.5—Shotcrete with lattice girders
16	5.6—Shotcrete with conventional steel sets 5.7—Recommended specifications
17	CHAPTER 6—MATERIALS HANDLING AND STORAGE 6.1—General 6.2—Temperature considerations
18	6.3—Recommended specifications CHAPTER 7—SHOTCRETE MIXTURE PROPORTIONING 7.1—General 7.2—Mixture proportions by trial batching or historical data submissions 7.3—In-place mixture proportions
19	7.4—Dry-mix shotcrete
20	7.5—Wet-mix shotcrete
22	7.6—Recommended specifications CHAPTER 8—PERFORMANCE REQUIREMENTS 8.1—General 8.2—Water-cementitious materials ratio 8.3—Air content
23	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
24	8.9—Other tests 8.10—Bond strength 8.11—Fire-induced explosive spalling protection 8.12—Recommended specifications
25	CHAPTER 9—QUALITY ASSURANCE AND QUALITY CONTROL 9.1—General
26	9.2—Recommended specifications CHAPTER 10—PRECONSTRUCTION TRIALS AND TESTING 10.1—General 10.2—Recommended specifications
28	CHAPTER 11—CONSTRUCTION ACCEPTANCE INSPECTION 11.1—General 11.2—Acceptance inspection
30	11.3—Specific inspection and testing quality control requirements for underground shotcrete
31	11.4—Cold placement conditions 11.5—Hot placement conditions 11.6—Shotcrete acceptance and rejection
32	11.7—Recommended specifications
34	11.8—Recommended QC Inspection and Testing Checklist
35	CHAPTER 12—BATCHING, MIXING, AND SUPPLY 12.1—Handling of bulk bin-bags 12.2—Quality control considerations 12.3—Recommended specifications
37	CHAPTER 13—PLACING EQUIPMENT 13.1—General 13.2—Pumps for wet-mix 13.3—Guns for dry-mix
38	13.4—Nozzle systems 13.5—Remote-controlled spraying
39	13.6—Recommended specifications
40	CHAPTER 14—AUXILIARY EQUIPMENT 14.1—Air supply
41	14.2—Recommended specifications
42	CHAPTER 15—SAFETY 15.1—General 15.2—Underground safety 15.3—Required personal safety equipment
43	15.4—View of shotcrete work 15.5—Communications
44	15.6—Nonpersonal safety equipment 15.7—Recommended specifications
45	CHAPTER 16—PREPARATION FOR SHOTCRETING AND GROUNDWATER CONTROL 16.1—General 16.2—Factors affecting shotcrete adhesion and bonding
46	16.3—Surface preparation 16.4—Groundwater
47	16.5—Recommended specifications
48	CHAPTER 17—GROUND REINFORCEMENT INSTALLATION 17.1—General 17.2—Rock bolt installation 17.3—Steel set installation 17.4—Lattice girder installation
49	17.5—Face support 17.6—Recommended specifications CHAPTER 18—SHOTCRETE APPLICATION 18.1—Methods used to control thickness 18.2—Cover, alignment, and tolerance
50	18.3—Recommended specifications
52	CHAPTER 19—CURING AND PROTECTION 19.1—General 19.2—Protection
53	19.3—Recommended specifications
54	CHAPTER 20—SHOTCRETE FOR REPAIR AND REHABILITATION OF UNDERGROUND STRUCTURES 20.1—General 20.2—Materials selection
55	20.3—Shotcrete placement methods for repair 20.4—Quality assurance requirements for rehabilitation of underground structures 20.5—Repair considerations
56	20.6—Recommended specifications CHAPTER 21—MEASUREMENT AND PAYMENT 21.1—Basis for payment
57	21.2—Recommended specifications CHAPTER 22—REFERENCES
58	Authored documents