Abstract: This document addresses materials and quality considerations when using cast-in-place, normal-weight, high-strength concrete in structures that must be designed for moderate to high seismic applications.The term “high-strength concrete,” as defined by ACI Committee 363, refers to concrete having a specified compressive strength for design of 8000 psi (55 MPa) or greater. The lower 6000 psi (41 MPa) threshold, however, was chosen for the ITG-4 document because it deals with a specialized application of high-strength concrete application in areas of moderate to high seismicity. An accompanying standard, ITG-4.1 (available Spring 2007), is written in mandatory language in a format that can be adopted by local jurisdictions, and will allow building officials to approve the use of high-strength concrete on projects that are being constructed under the provisions of ACI 301 and 318. ITG-4.2R is the supporting document for that standard.ITG 4 has also developed another non-mandatory language document: ITG-4.3R (available Spring 2007). It addresses structural design and detailing considerations.

Keywords: curing; high-strength concrete; mixture proportioning;placement; preconstruction meeting; production; project specification;quality control; seismic design; supplementary cementitious materials;temperature; trial batches.

Contents: CONTENTS

Chapter 1—Introduction, p. ITG-4.2R-2

1.1—Background

1.2—Scope

Chapter 2—Preamble, p. ITG-4.2R-3

Chapter 3—Glossary of terms, p. ITG-4.2R-4

Chapter 4—Properties of high-strength concrete, p. ITG-4.2R-5

4.1—Mechanical properties

4.2—Durability properties

4.3—Constructibility properties

Chapter 5—Raw materials, p. ITG-4.2R-10

Chapter 6—Mixture proportioning, p. ITG-4.2R-11

6.1—Required strength

6.2—Water-cementitious material ratio

6.3—Cementitious materials content

6.4—Air entrainment

6.5—Aggregates

6.6—Supplementary cementitious materials

6.7—Chemical admixtures

6.8—Combinations of supplementary cementitious materials and chemical admixtures

6.9—Proportioning for workability

6.10—Trial batches

Chapter 7—Mixture submittal requirements, p. ITG-4.2R-16

Chapter 8—Preconstruction meetings, p. ITG-4.2R-16

8.1—Batching

8.2—Transportation

8.3—Placement

Chapter 9—Ordering, p. ITG-4.2R-18

Chapter 10—Raw materials handling, p. ITG-4.2R-18

Chapter 11—Production and delivery, p. ITG-4.2R-18

Chapter 12—Concrete temperature control, p. ITG-4.2R-18

Chapter 13—Placement, consolidation, and finishing, p. ITG-4.2R-19

Chapter 14—Curing, p. ITG-4.2R-19

Chapter 15—Raw material sampling and testing, p. ITG-4.2R-20

15.1—Sampling method

15.2—Sample identification

15.3—Testing

Chapter 16—Concrete sampling and testing, p. ITG-4.2R-20

16.1—Sampling and testing schedule

Chapter 17—Summary and recommendations, p. ITG-4.2R-21

17.1—Raw materials

17.2—Mixture proportioning

17.3—Mixture submittal requirements

17.4—Preconstruction meetings

17.5—Ordering

17.6—Raw materials handling

17.7—Production and delivery

17.8—Concrete temperature control

17.9—Placement, consolidation, and finishing

17.10—Curing

17.11—Raw materials sampling and testing

17.12—Concrete sampling and testing

Chapter 18—References, p. ITG-4.2R-23

18.1—Referenced standards and reports

18.2—Cited references

Appendix—Sample agenda for preconstruction

meeting concerning high-strength concrete, p. ITG-4.2R-26