This manual covers the following areas in seven chapters: Chapter 1 - Fundamentals of Air Entrainment; Chapter 2 - Air-Entraining Agents; Chapter 3 - Mixture Proportioning and Measurement of Air Content; Chapter 4 - Effects of Concrete Materials on Control of Air Content; Chapter 5 - Effects of Production Procedures on Control of Air Content; Chapter 6 - Effects of Construction Practices and Field Conditions on Control of Air Content; Chapter 7 - Questions and Answers.