Ingenieria

ACI 211.2-98
Standard Practice for Selecting Proportions for
Structural Lightweight Concrete (ACI 211.2-98)
Reported by ACI Committee 211
Jay R. Prestera
Secretary
Edward A. Abdun-Nur
Stanley G. Barton*
Leonard W. Bell
George R. U. Berg
Stanley J. Blas, Jr.
Peggy M. Carrasquillo
Ramon L. Carrasquillo
Martyn T. Conrey
James E. Cook
Russell A. Cook*
William A. Cordon
Wayne J. CostaKenneth W. Day
Calvin L. Dodl*
Donald E. Graham

Michael Boyle
Chairman
George W. Hollon*
William W. Hotaling, Jr.
Robert S. Jenkins
Paul Klieger
Frank J. Lahm
Stanley H. Lee
Gary R. Mass
Richard C. Meininger
Richard W. Narva
Leo P. Nicholson
James E. Oliverson
James S. Pierce
Sandor Popovics
Steven A. Ragan
Harry C. Robinson

David A. Crocker
Chairman, Subcommittee BJere H. Rose
James A. Scherocman
James M. Shilstone, Sr.
George B. Southworth
Alfred B. Spamer
Paul R. Stodola*
Michael A. Taylor
Stanley J. Virgalitte*
William H. Voelker
Jack W. Weber
Dean J. White, II
Milton H. Wills, Jr.
Francis C. Wilson
Robert L. Yuan

*Members of Subcommittee B who prepared this standard.

Describes, with examples, two methods for proportioning and
adjustingproportions of structural grade concrete containing
lightweight aggregates. The weight (pycnometer) method uses a
specific gravity factor determined by a displacement pycnometer
test on the aggregates (Method 1). The weight method also
employs the specific gravity factor to estimate the weight per yd3 of
the fresh concrete. The damp, loose volume method uses the
cement content-strengthrelationship for the design of all lightweight and sand lightweight concretes (Method 2). Examples are
given for systematic calculation of batch weights, effective displaced volumes, and adjustment to compensate for changes in

ACI Committee Reports, Guides, Standard Practices, and
Commentaries are intended for guidance in planning, designing, executing, and inspecting construction. This documentis 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 application 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 document 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.

aggregate moisture content, aggregate proportions, cement content, slump and/or air content.
Keywords: absorption; adsorption;aggregate gradation; air content; air
entrainment; cement content; coarse aggregates; fine aggregates; fineness
modulus; lightweight aggregate concretes; lightweight aggregates; mix
proportioning; moisture; sampling; slump test; specific gravity factor;
testing; water.

CONTENTS
Chapter 1—Introduction, p. 211.2-2
1.1Purpose
1.2Scope
Chapter 2—Factors affecting proportioning oflightweight aggregate concrete, p. 211.2-2
2.1Aggregates (Absorption and moisture content)
2.2Aggregates ( Gradation)
2.3Water-cement ratio
2.4Air entrainment

ACI 211.2-98 supersedes ACI 211.2-91 and became effective March 1, 1998.
Copyright © 1998, American Concrete Institute.
All rights reserved including rights of reproduction and use in any form or by any
means, including the making ofcopies 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 system or device, unless permission in
writing is obtained from the copyright proprietors.

2 11.2-1

211.2-2

A CI STANDARD PRACTICE

Chapter 3—Estimating first trial mixture
proportions, p. 211.2-4...