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211.4R-93 Guide for Selecting Proportions for High ...

ACI (Reapproved 1998). Guide for Selecting Proportions for high -Strength Concrete with portland Cement and Fly Ash Reported by ACI Committee 211. Gary R. Mass Chairman Olga Alonzo* Calvin L. Dodl Donald Schlegel William L Barringer Thomas A. Fox* James M. Shilstone, Jr.*. Stanley G. Barton George W. Hollow Paul R. Stodola Leonard W. Bell Tarif M. Jaber* William X. Sypher James E. Bennett Stephen M. Lane Ava Shypula*. Mike Boyle* Stanley H. Lee Jimmie L Thompson*. George Burg Mark Luther* Stanley J. Virgalitte Ramon L Carrasquillo* Richard C. Meininger Woodward L Vogt James E.

ACI 211.4R-93 (Reapproved 1998) Guide for Selecting Proportions for High-Strength Concrete with Portland Cementand Fly Ash Reported by ACI Committee211

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Transcription of 211.4R-93 Guide for Selecting Proportions for High ...

1 ACI (Reapproved 1998). Guide for Selecting Proportions for high -Strength Concrete with portland Cement and Fly Ash Reported by ACI Committee 211. Gary R. Mass Chairman Olga Alonzo* Calvin L. Dodl Donald Schlegel William L Barringer Thomas A. Fox* James M. Shilstone, Jr.*. Stanley G. Barton George W. Hollow Paul R. Stodola Leonard W. Bell Tarif M. Jaber* William X. Sypher James E. Bennett Stephen M. Lane Ava Shypula*. Mike Boyle* Stanley H. Lee Jimmie L Thompson*. George Burg Mark Luther* Stanley J. Virgalitte Ramon L Carrasquillo* Richard C. Meininger Woodward L Vogt James E.

2 Cook* James S. Pierce Jack W. Weber Russell A. Cook Mike Pistilli* Dean J. White, IIt David A. Crocker Sandor Popovics* Marshall S. Williams Guy Detwiler* Steven E. Ragan John R. Wilson Donald E. Dixon l Members of subcommittee who prepared the report. t Subcommittee Chairman. This Guide presents a generally applicable method for Selecting mixture Chapter 3-Fundamental relationships, pg. Proportions for high -strength concrete and optimizing these mixture propor- of materials tions on the basis of trial batches. The method is limited to high -stmngth concrete produced using conventional materials and production techniques.

3 Materials ratio (w/c +p). Recommendations and tables are based on current practice and infor- mation provided by contractors, concrete suppliers, and engineers who have measurements been involved in projects dealing with high -strength concrete. Chapter 4- high -strength concrete mixture proportion- Keywords: aggregates; capping; chemical admixtures; fine aggregates; fIy ash;. high -strength concretes; mixture proportioning; quality control; specimen size; ing, pg. strength requirements; superplasticizers. CONTENTS proportioning procedure Chapter 5-Sample calculations, pg.

4 Chapter 1-Introduction, pg. Chapter 6-References, pg. Chapter 2-Performance requirements, pg. age references strength requirements CHAPTER l-INTRODUCTION. ACI Committee Reports, Guides, Standard Practices, and Commentaries are intended for guidance in designing, plan- The current ACI mixture proportioning proce- ning, executing, or inspecting construction and in preparing ACI became effective September specifications. References to these documents shall not be Copyright Q 1993, American Concrete Institute. made in the Project Documents. If items found in these All rights reserved including rights of reproduction and use in any form or by documents are desired to be a part of the Project Docu- any means, including the making of copies by any photo process, or by any elec- ments, they should be phrased in mandatory language and tronic or mechanical device, printed, written, or oral, or recording for sound or incorporated into the Project Documents.

5 Visual reproduction or for use in any knowledge or retrieval system or device, unless permission in writing is obtained from the copyright proprietors. ACI COMMITTEE REPORT. dure describes methods for Selecting Proportions for nor- based on field experience or laboratory trial batches. To mal strength concrete in the range of 2000 to 6000 psi. meet the specified strength requirements, the concrete Mixture proportioning is more critical for high -strength must be proportioned in such a manner that the average concrete than for normal strength concrete. Usually, spe- compressive strength results of field tests exceed the cially selected pozzolanic and chemical admixtures are specified design compressive strength f,' by an amount employed, and attainment of a low water-to-cementitious sufficiently high to make the probability of low tests material ratio (w/c+p) is considered essential.

6 Many trial small. When the concrete producer chooses to select mixtures are often required to generate the data neces- high -strength concrete mixture Proportions based upon sary to identify optimum mixture Proportions . The pur- field experience, it is recommended that the required pose of this Guide is to present a generally applicable average strength fc,' used as the basis for selection of method for Selecting mixture Proportions for high - concrete Proportions be taken as the larger value calcu- strength concrete and for optimizing these mixture pro- lated from the following equations portions on the basis of trial batches.

7 F_' = f,' + (2-1). Discussion in this Guide is limited to high -strength concrete produced using conventional materials and fw ' = ,' + (2-2). production methods. Consideration of silica fume and where s = sample standard deviation in psi. ground granulated blast furnace slag (GGBFS) is beyond Eq. (2-l) is Eq. (5-l) of the ACI 318 Building Code. the scope of this document. Information on proportion- Eq. (2-2) is a modified version of Eq. (5-2) qcr' = fc' +. ing of silica fume concrete is limited at this time. ACI. - 500) of the modified ACI 318 because, to date, Committee 234, Silica Fume in Concrete, is developing job specifications for high -strength concrete have usually information on the use of silica fume for a committee more than 1 in 100 individual tests that will fall below 90.

8 Report. Proportioning GGBFS concrete is discussed in percent of the specified strength. When job specifications ACI 226-1R (now ACI Committee 233). When additional cite ACI 318 acceptance criteria, Eq. (5-2) of ACI 318. data becomes available, it is expected that an ACI Guide should be used instead of Eq. (2-2) of this report. for proportioning concrete with these materials will be When the concrete producer selects high -strength con- developed. Currently, silica fume and GGBFS suppliers, crete Proportions on the basis of laboratory trial batches, as well as experienced concrete suppliers, represent the the required average strength f, may be determined best source of proportioning information for these materials.

9 From the equation high -strength concrete is defined as concrete that has a specified compressive strengthf,' of 6000 psi or greater. (2-3). This Guide is intended to cover field strengths up to 12,000 psi as a practical working range, although greater strengths may be obtained. Recommendations are based Eq. (2-3) gives a higher required average strength on current practice and information from contractors, value than that required in Table of the ACI. concrete suppliers, and engineers who have been involved Building Code (ACI 318). Experience has shown that in projects dealing with high -strength concrete.

10 For a strength tested under ideal field conditions attains only more complete list of references and available publica- 90 percent of the strength measured by tests performed tions on the topic, the reader should refer to ACI 363R. under laboratory conditions. To assume that the average strength of field production concrete will equal the strength of a laboratory trial batch is not realistic, since CHAPTER 2-PERFORMANCE REQUIREMENTS many factors can influence the variability of strengths and strength measurements in the field. Initial use of a high - age strength concrete mixture in the field may require some The selection of mixture Proportions can be influenced adjustments in Proportions for air content and yield, and by the testing age.


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