ACI 305R:2020

CHAPTER 1—INTRODUCTION AND SCOPE, p. 2 1.1—Introduction, p. 2 1.2—Scope, p. 2 CHAPTER 2—NOTATION AND DEFINITIONS, p. 2 2.1—Notation, p. 2 2.2—Definitions, p. 3 CHAPTER 3—POTENTIAL PROBLEMS AND PRACTICES, p. 3 3.1—Potential problems in hot weather, p. 3 3.2—Potential problems related to other factors, p. 3 3.3—Practices for hot weather concreting, p. 3 CHAPTER 4—EFFECTS OF HOT WEATHER ON CONCRETE PROPERTIES, p. 4 4.1—General, p. 4 4.2—Calculating estimated evaporation rate, p. 7 4.3—Effects of temperature of concrete, p. 9 4.4—Maximum ambient and concrete temperature, p. 9 4.5—Water, p. 10 4.6—Cement, p. 11 4.7—Supplementary cementitious materials, p. 12 4.8—Chemical admixtures, p. 12 4.9—Aggregates, p. 14 4.10—Fibers, p. 14 4.11—Proportioning, p. 15 CHAPTER 5—PRODUCTION AND DELIVERY, p. 16 5.1—General, p. 16 5.2—Temperature control of concrete, p. 16 5.3—Batching and mixing, p. 17 5.4—Delivery, p. 18 5.5—Slump adjustment, p. 18 5.6—Properties of concrete mixtures, p. 18

This guide identifies problems associated with hot weather concreting and describes practices that alleviate these potential adverse effects.