ACI PRC-207.4-20: Cooling and Insulating Systems for Mass Concrete

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Description

The need to control volume change induced primarily by temperature change in mass concrete often requires thermal control of concrete. This report reviews these thermal control methods such as precooling, postcooling, and insulating systems. A simplified method for computing the temperature of freshly mixed concrete cooled by various systems is also presented.

Keywords:

cement content; coarse aggregate; creep; formwork; heat of hydration; mass concrete; modulus of elasticity; precooling; postcooling; pozzolan; restraint; specific heat; strain; stress; temperature rise; tensile strength; thermal conductivity; thermal diffusivity; thermal expansion; thermal gradient; thermal shock.

 

Document Details

Author: ACI Committee 207

ISBN: 9781641951241

Categories: Aggregates, Formwork, Mass Concrete, Pozzolans

Formats: Protected PDF/Web View

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE, p. 2

1.1—Scope and objective, p. 2

1.2—Historical background, p. 2

1.3—Types of structures and temperature controls, p. 2

1.4—Construction practices for temperature control, p. 3

1.5—Instrumentation, p. 3

CHAPTER 2—PRECOOLING SYSTEMS, p. 3

2.1—General, p. 3

2.2—Heat exchange, p. 3

2.3—Batch water, p. 5

2.4—Aggregate cooling, p. 6

2.5—Cementitious materials, p. 8

2.6—Heat gains during concreting operations, p. 8

2.7—Refrigeration plant capacity, p. 8

2.8—Placement area, p. 9

CHAPTER 3—POSTCOOLING SYSTEMS, p. 9

3.1—General, p. 9

3.2—Embedded pipe, p. 10

3.3—Refrigeration and pumping facilities, p. 10

3.4—Operational flow control, p. 11

3.5—Surface cooling of dam structures, p. 11

CHAPTER 4—SURFACE INSULATION, p. 11

4.1—General, p. 11

4.2—Materials, p. 12

4.3—Horizontal surfaces, p. 12

4.4—Formed surfaces, p. 13

4.5—Solar radiation, p. 14

4.6—Geographical requirements, p. 14

CHAPTER 5—REFERENCES, p. 15

Authored documents, p. 15

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