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ACI 232.2R 18:2018 Edition

ACI 232.2R 18:2018 Edition

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ACI 232.2R-18: Report on the Use of Fly Ash in Concrete

Published By Publication Date Number of Pages
ACI 2018 60
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Fly ash is used in concrete and other portland cement-based systems primarily because of its pozzolanic and cementitious properties. These properties contribute to strength gain and are known to improve the performance of fresh and hardened concrete, mortar, and grout. The use of fly ash typically results in more economical concrete construction. This report gives an overview of the origin and properties of fly ash, its effect on the properties of hydraulic cement concrete, and the selection and use of fly ash in the production of hydraulic cement concrete and concrete products. Information and recommendations concerning the selection and use of Class C and Class F fly ashes conforming to the requirements of ASTM C618 are provided. Topics covered include a detailed description of the composition of fly ash, the physical and chemical effects of fly ash on properties of concrete, guidance on the handling and use of fly ash in concrete construction, use of fly ash in the production of concrete products and specialty concretes, and recommended procedures for quality control. High-volume fly ash concrete is covered in a general way in this report; readers can consult ACI 232.3R for more information. Keywords: alkali-aggregate reaction; controlled low-strength material; durability; fly ash; mass concrete; pozzolan; sulfate resistance; sustainability; workability.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
4 CHAPTER 1—INTRODUCTION, SCOPE, SOURCES, AND SUSTAINABILITY
1.1—Introduction
5 1.2—Scope
1.3—Source of fly ash
9 1.4—Fly ash and sustainability
11 CHAPTER 2—DEFINITIONS
CHAPTER 3—FLY ASH COMPOSITION
3.1—General
12 3.2—Chemical composition
13 3.3—Crystalline constituents
15 3.4—Glassy constituents
17 3.5—Physical properties
19 3.6—Chemical activity of fly ash in hydraulic cement concrete
20 3.7—Future research needs
CHAPTER 4—EFFECTS OF FLY ASH ON CONCRETE
4.1—Effects on properties of fresh concrete
22 4.2—Effects on properties of hardened concrete
28 CHAPTER 5—CONCRETE MIXTURE PROPORTIONING
5.1—General
29 5.2—Considerations in mixture proportioning
CHAPTER 6—FLY ASH SPECIFICATIONS, TEST METHODS, AND QUALITY ASSURANCE/QUALITY CONTROL
6.1—Introduction
30 6.2—Chemical requirements
31 6.3—Physical requirements
32 6.4—General specification provisions
6.5—Methods of sampling and testing
6.6—Source quality control
33 6.7—Startup, oil, and stack additives
34 6.8—Rapid quality control tests
CHAPTER 7—FLY ASH IN CONCRETE CONSTRUCTION
7.1—Ready mixed concrete
7.2—Concrete pavement
35 7.3—Mass concrete
7.4—Roller-compacted concrete
7.5—Self-consolidating concrete
36 7.6—High-volume fly ash concrete
7.7—High-performance concrete
7.8—Long-life structures
37 7.9—Bulk handling and storage
38 7.10—Batching
CHAPTER 8—FLY ASH IN CONCRETE PRODUCTS
8.1—Concrete masonry units
39 8.2—Concrete pipe
8.3—Precast/prestressed concrete products
40 8.4—No-slump extruded hollow core slabs
8.5—Concrete tile
8.6—Miscellaneous concrete products
CHAPTER 9—OTHER USES OF FLY ASH
9.1—Grouts and mortar
41 9.2—Controlled low-strength material
9.3—Soil cement
9.4—Plastering
9.5—Cellular concrete
9.6—Shotcrete
42 9.7—Waste management
9.8—Cements
CHAPTER 10—REFERENCES
43 Authored documents
56 APPENDIX A—RAPID QUALITY CONTROL TESTS
A.1—Loss on ignition
A.2—Carbon analysis
A.3—Particle size
57 A.4—Color
A.5—Density (specific gravity)
A.6—Fly ash adsorption
A.7—Organic material
A.8—CaO content
A.9—Presence of hydrocarbons (startup oil)
A.10—Presence of ammonia (precipitator additive)
A.11—Calorimetry

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ACI 232.2R 18
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