ACI 232 2R-2018 Report on the Use of Fly Ash in Concrete.pdf
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1、Report on the Use of Fly Ash in Concrete Reported by ACI Committee 232 ACI 232.2R-18First Printing April 2018 ISBN: 978-1-64195-006-0 Report on the Use of Fly Ash in Concrete Copyright by the American Concrete Institute, Farmington Hills, MI. All rights reserved. This material may not be reproduced
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11、Specifications, and Practices. American Concrete Institute 38800 Country Club Drive Farmington Hills, MI 48331 Phone: +1.248.848.3700 Fax: +1.248.848.3701 www.concrete.orgFly ash is used in concrete and other portland cement-based systems primarily because of its pozzolanic and cementitious prop- er
12、ties. 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 ef
13、fect 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 recommenda- tions concerning the selection and use of Class C and Class F fly ashes conforming to the requirements of ASTM C
14、618 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 speci
15、alty 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; poz
16、zolan; sulfate resistance; sustain- ability; workability. CONTENTS CHAPTER 1INTRODUCTION, SCOPE, SOURCES, AND SUSTAINABILITY, p. 2 1.1Introduction, p. 2 1.2Scope, p. 3 1.3Source of fly ash, p. 3 1.4Fly ash and sustainability, p. 7 CHAPTER 2DEFINITIONS, p. 9 CHAPTER 3FLY ASH COMPOSITION, p. 9 3.1Gene
17、ral, p. 9 3.2Chemical composition, p. 10 3.3Crystalline constituents, p. 11 3.4Glassy constituents, p. 13 3.5Physical properties, p. 15 3.6Chemical activity of fly ash in hydraulic cement concrete, p. 17 3.7Future research needs, p. 18 Karthik H. Obla, Chair Robert E. Neal, Vice Chair Michael D. A.
18、Thomas, Vice Chair Lawrence L. Sutter, Secretary ACI 232.2R-18 Report on the Use of Fly Ash in Concrete Reported by ACI Committee 232 Thomas H. Adams Gregory S. Barger Dale P. Bentz James C. Blankenship Julie K. Buffenbarger Ramon L. Carrasquillo Barry A. Descheneaux Jonathan E. Dongell John M. Fox
19、Thomas M. Greene Harvey H. Haynes James K. Hicks R. Doug Hooton Morris Huffman James S. Jensen Tilghman H. Keiper Steven H. Kosmatka Adrian Marc Nacamuli Bruce W. Ramme Steve Ratchye Michael D. Serra Ava Shypula Boris Y . Stein Oscar Tavares Paul J. Tikalsky Thomas J. Van Dam Craig R. Wallace Orvill
20、e R. Werner Consulting Members Mark A. Bury James E. Cook Dean M. Golden William Halczak G. Terry Harris Sr. Jan R. Prusinski Harry C. Roof Della M. Roy Special acknowledgements to M. U. Christiansen and K. A. MacDonald for their contributions to this report. ACI Committee Reports, Guides, and Comme
21、ntaries are intended for guidance in planning, designing, executing, and inspecting construction. This document is intended for the use of individuals who are competent to evaluate the significance and limitations of its content and recommendations and who will accept responsibility for the applicat
22、ion of the material it contains. The American Concrete Institute disclaims any and all responsibility for the stated principles. The Institute shall not be liable for any loss or damage arising therefrom. Reference to this document shall not be made in contract documents. If items found in this docu
23、ment are desired by the Architect/Engineer to be a part of the contract documents, they shall be restated in mandatory language for incorporation by the Architect/Engineer. ACI 232.2R-18 supersedes ACI 232.2R-03 and was adopted and published April 2018. Copyright 2018, American Concrete Institute. A
24、ll rights reserved including rights of reproduction and use in any form or by any means, including the making of copies by any photo process, or by electronic or mechanical device, printed, written, or oral, or recording for sound or visual reproduction or for use in any knowledge or retrieval syste
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