Guide to Shotcrete / Shotcrete - Guide ACI PRC-506-22

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Guide to Shotcrete / Shotcrete – Guide ACI PRC-506-22

The document titled “ACI PRC‑506‑22 Shotcrete – Guide” (first printing November 2022) from the American Concrete Institute (ACI), authored by Committee 506, serves as the authoritative non-mandatory guide to shotcrete practices—covering both dry-mix and wet-mix methods—by providing detailed commentary and background to the mandatory specification ACI 506.2 Specification for Shotcrete; the guide discusses scope/definitions, materials, mixture proportions, surface preparation, application equipment and crew responsibilities, curing, protection, tolerances, repair, sustainability considerations and other facets of shotcrete placement.

Shotcrete - Guide ACI PRC-506-22

DESCRIPTION

This guide is a companion document to ACI 506.2, “Specification for Shotcrete,” and provides information on materials and properties of both dry-mix and wet-mix shotcrete. Most facets of the shotcrete process are covered, including application procedures, equipment requirements, and responsibilities of the shotcrete crew. Other aspects, such as preconstruction trials, craftsman qualification tests, materials tests, finished shotcrete acceptance tests, and equipment, are also discussed.

DOCUMENT DETAILS

Author: ACI Committee 506

Publication Year: 2022

Pages: 52

ISBN: 9781641952019

 

TABLE OF CONTENTS

Contents

PREFACE, p. 2

Introduction, p. 2

History, p. 2

Applications, p. 3

New developments, p. 3

Research and development, p. 3

PART 1—GENERAL, p. 3

1.1—Scope, p. 3

1.2—Definitions, p. 5

1.3—References: Refer to Part 7, p. 5

1.4—Submittals, p. 5

1.5—Preconstruction testing by contractor, p. 5

1.6—Testing during construction: quality assurance and quality control, p. 6

1.7—Acceptance, p. 9

PART 2—PRODUCTS, p. 9

2.1—Materials, p. 9

2.2—Packaged shotcrete materials, p. 13

2.3—Fiber-reinforced shotcrete, p. 13

2.4—Shotcrete properties, p. 13

2.5—Mixture proportions, p. 16

2.6—Batching and mixing, p. 18

PART 3—EXECUTION, p. 20

3.1—Surface preparation, p. 20

3.2—Joints, p. 24

3.3—Alignment control, p. 24

3.4—Application, p. 25

3.5—Finishing, p. 35

3.6—Curing, p. 38

3.7—Protection, p. 38

3.8—Tolerances, p. 38

3.9—Repair, p. 39

PART 4—EQUIPMENT, p. 39

4.1—Introduction, p. 39

4.2—Dry-mix equipment, p. 40

4.3—Wet-mix equipment, p. 41

4.4—Air requirements, p. 42

4.5—Mixing equipment, p. 43

4.6—Hoses, p. 43

4.7—Nozzles, p. 44

4.8—Auxiliary equipment, p. 45

4.9—Plant layout and operation, p. 46

4.10—Other uses of shotcrete equipment, p. 47

PART 5—CREW ORGANIZATION, p. 47

5.1—Introduction, p. 47

5.2—Composition and crew duties, p. 47

5.3—Crew qualifications, p. 48

5.4—Communication, p. 49

PART 6—SUSTAINABILITY, p. 49

6.1—Shotcrete sustainability, p. 49

6.2—Formwork reduction or elimination, p. 49

6.3—Construction efficiency, p. 50

6.4—Repair and rehabilitation, p. 50

6.5—Creativity and efficiency of shotcrete sections, p. 50

6.6—Summary, p. 50

PART 7—REFERENCES, p. 50

Authored references, p. 52